VArMin Operator Manual Sept 2010 - Castle Power...

VArVArVArVAr----MinMinMinMin Intelligent Capacitor Control

Operators Guide September, 2010 Valquest Systems Inc.

351 S. Sherman, St. # 100

Richardson, Tx. 75081

Copyright Notice

Copyright 2005-2010 Valquest Systems, Inc.

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in

any form or by any means - electronic, mechanical, photocopying, recording, or otherwise - without prior written

permission of Valquest Systems, Inc.

Valquest Systems, Inc. provides this manual “as is”, without warranty of any kind either expressed or implied.

Valquest Systems, Inc. may make changes and/or improvements in this manual at any time and without notice.

Although Valquest Systems, Inc. has gone to great effort to verify the integrity of the information herein, this

publication could contain technical inaccuracies or typographical errors. Changes are periodically made to the

information contained herein. These changes will be incorporated in new editions of this publication.

Trademarks

IBM PC and IBM AT are registered trademarks of IBM Corp.

VAr-Min is a registered trademark of Valquest Systems, Inc.

Fisher Pierce Series 1301 LPCS is a registered trademark of Pacific Scientific, Fisher Pierce Division.

Lindsey 9600 Series LPCS is a registered trademark of Lindsey Manufacturing Co.

Windows and Windows XP are registered trademarks of Microsoft Corp.

Fluke 87 is a registered trademark of Fluke Corp.

Valquest Systems Inc. VAr-Min User Manual

©Valquest Systems Inc. 9/20/2010

Table of Contents

1.0 INTRODUCTION ...........................................................................................................................................7

2.0 OVERVIEW OF FEATURES ........................................................................................................................8

2.1 CAPACITOR CONTROLS GENERAL DESCRIPTION...........................................................................8

2.2 VAR-MIN ELECTRICAL FEATURES........................................................................................................8

2.2.1 OIL SWITCHES ..................................................................................................................................................8

2.2.2 CAPACITOR CONTROL RELAYS.........................................................................................................................8

2.2.3 OIL SWITCH POSITION DETECTION ...................................................................................................................9

2.2.4 LINE VOLTAGE MEASUREMENT .......................................................................................................................9

2.2.5 CURRENT MEASUREMENT................................................................................................................................9

2.3 VAR-MIN FUNCTIONS.................................................................................................................................9

2.3.1 CONTROL .........................................................................................................................................................9

2.3.2 DATA COLLECTION ..........................................................................................................................................9

3.0 INSTALLATION...........................................................................................................................................10

3.1 INSPECTION ................................................................................................................................................10

3.2 PHYSICAL MOUNTING.............................................................................................................................10

3.3 TEMPERATURE SENSOR (OPTIONAL).................................................................................................10

3.4 CONNECTIONS (METER BASE OPTIONS) ...........................................................................................11

4.0 DISPLAY MENU...........................................................................................................................................12

4.1 MENU SYSTEM & MANUAL OPERATOR CONTROLS......................................................................12

4.1.1 MANUAL OPERATION CONTROLS..............................................................................................................12

4.1.2 TOGGLE SWITCHES AND LEDS .................................................................................................................13

4.1.2.1 TOGGLE SWITCHES ...................................................................................................................................13

4.1.2.2 LED’S ......................................................................................................................................................14

4.2 BASIC FLOW DIAGRAM ...........................................................................................................................16

4.3 VAR-MIN MENU ITEMS ............................................................................................................................17

4.3.1 MENU DISPLAY TYPES ...................................................................................................................................17

4.3.2 ID & NUMBER OF OPERATIONS (SOFTWARE PROTECTED)..............................................................................18

4.3.3 ELECTRICAL VALUES (READ ONLY)...............................................................................................................18

4.3.4 CONTROL METHOD (CHANGEABLE) ..............................................................................................................18

4.3.5 CAPACITOR BANK SIZE (CHANGEABLE) .......................................................................................................20

4.3.6 OVERRIDE METHOD (CHANGEABLE) ...........................................................................................................20

4.3.7 VOLTAGE OVERRIDE (CHANGEABLE) ..........................................................................................................21

4.3.8 VOLTAGE UNDERRIDE (CHANGEABLE).........................................................................................................21

4.3.9 TURN-ON TIME (CHANGEABLE) ....................................................................................................................21

4.3.10 TURN-OFF TIME (CHANGEABLE) ..................................................................................................................21

4.3.11 DATE & TIME MENU SELECTIONS................................................................................................................21



4.3.12 ADD V/F (VOLTAGE/FREQUENCY) TRIPPING MENU SELECTIONS ................................................................22

4.3.13 SCADA ADDRESS MENU SELECTIONS...........................................................................................................22

4.3.14 ADDITIONAL KVAR SETUP INFORMATION (LPCS SELECTION/POSITION) ......................................................22

5.0 MANUAL PROGRAMMING & FLOW CHARTS ...................................................................................23

5.1 PROGRAMMING FLOWCHARTS .............................................................................................................23

5.1 PARAMETRIC INFORMATION DISPLAYS...........................................................................................31

5.2 CONTROL ON KVAR PROGRAMMING ................................................................................................32

5.2.1 KVAR (NO OVERRIDE) .............................................................................................................................32

5.2.2 KVAR WITH DOW OVERRIDE ..................................................................................................................32

5.2.3 KVAR WITH VOLTAGE OVERRIDE.............................................................................................................33

5.2.4 KVAR WITH DOW & VOLTAGE ................................................................................................................33

5.3 CONTROL ON TIME PROGRAMMING .................................................................................................35

5.3.1 TIME (NO OVERRIDE) ...............................................................................................................................35

5.3.2 TIME (WITH DOW OVERRIDE)..................................................................................................................35

5.3.3 TIME WITH VOLTAGE OVERRIDE ..............................................................................................................36

5.3.4 TIME WITH DOW & VOLTAGE..................................................................................................................36

5.4 CONTROL ON TEMPERATURE PROGRAMMING .............................................................................37

5.4.1 TEMPERATURE (NO OVERRIDE) ...............................................................................................................37

5.4.2 TEMPERATURE WITH DOW OVERRIDE .....................................................................................................37

5.4.2 TEMPERATURE WITH VOLTAGE OVERRIDE ...............................................................................................38

5.4.4 TEMPERATURE WITH DOW & VOLTAGE ..................................................................................................38

5.5 CONTROL ON TIME/TEMPERATURE PROGRAMMING .................................................................39

5.5.1 TIME/TEMPERATURE (NO OVERRIDE) ......................................................................................................39

5.5.2 TIME/TEMPERATURE WITH DOW OVERRIDE............................................................................................39

5.5.3 TIME/TEMPERATURE WITH VOLTAGE OVERRIDE......................................................................................40

5.5.4 TIME/TEMPERATURE WITH DOW & VOLTAGE .........................................................................................40

5.6 CONTROL ON VOLTAGE PROGRAMMING ........................................................................................42

5.6.1 VOLTAGE (NO OVERRIDE)........................................................................................................................42

5.6.2 VOLTAGE WITH DOW OVERRIDE .............................................................................................................42

5.7 CONTROL WITH ALGORITHM ..............................................................................................................43

5.8 SETTING THE DATE & TIME ..................................................................................................................44

6.0 (RESERVED).................................................................................................................................................45

7.0 CONTROL ALGORITHM...........................................................................................................................45

8.0 ELECTRICAL PARAMETER MEASUREMENT THEORY..................................................................50

9.0 TYPICAL INSTALLATION DIAGRAM ...................................................................................................51

10.0 VAR-MIN FEATURES & SPECIFICATIONS ..........................................................................................52

11.0 ABOUT VALQUEST SYSTEMS.................................................................................................................54



Safety Considerations

This product and related documentation must be

reviewed for familiarization with safety markings and

instructions before operation.

Before Applying Power

Verify that the product shows no signs of physical

damage that may impair proper operation.

Verify that the Cables & Accessories (Voltage

probes/Current Transformers) to be used are in good

working condition and that they do not impose any

safety hazard such as exposure to electrical shock.

Warnings

When OPERATING or CONNECTING the VAr-

min to a VOLTAGE/CURRENT Source:

- Always Wear Protective Goggles or

Safety Glasses

- Always wear Industrial Grade Electrically

Insulated Gloves

- NEVER CONNECT the VAr-min to a

Service with a Maximum Nominal Voltage

Greater (>) than 120 Volts.



1.0 Introduction

Valquest Systems, Inc. offers the new state-of-the-art capacitor control: VAr-Min™. This

capacitor control model incorporates proven microcontroller technology, serial RS-232 ports to

communicate to a PC, and industry-standard meter base connectors encased in durable

polycarbonate enclosures.

By implementing efficient hardware design techniques combined with user-defined or wizard

generated control algorithms, real-time monitoring and capacitor-bank switching capabilities are

possible. Each capacitor control samples analog current and voltage waveforms and converts

each signal into digital format. An embedded software algorithm calculates in real-time the

voltage, current, watts, VARs, phase angle and power factor. A capacitor switching algorithm,

pre-programmed by the user, uses these calculations and other variables to control the on/off

capacitor bank switching capabilities. This design also allows for historical data recording up to

273 days.

The software furnished with each capacitor control system is easy to use yet powerful enough to

provide detailed information in report or graphical formats. This information can be directed to

your computer screen, printed out to a dot matrix or laser printer, or stored in ASCII or standard

spreadsheet formats.

Both recording parameters and the report generators can be configured for short-term or long-

term data recording modes. Multiple data files are supported for long term historical data

analysis. The data analyzed is presented as tabular records or graphical waveforms.

Thank you for your purchase of this capacitor control unit. It is an investment which will pay for

itself in a short time by giving you the information you need to make your system more efficient,

thus reducing your total costs.

This manual is intended to give you the information you need to install and operate each type of

capacitor control unit and the reporting software. However, there may be times that you need to

contact us to discuss a unique monitoring environment. We are a service oriented company, and

we welcome any questions and suggestions you may have. Please feel free to contact us at the

following address:

Valquest Systems 351 S. Sherman, Suite 100 Richardson, Texas 75081

Phone: 972-234-2954 Fax: 972-238-9501



2.0 Overview of Features

2.1 Capacitor Controls General Description

• Single Unit operation provides the following Modes of Operational Control:

kVAr Control**

Time Control**

Temperature Control**

Time & Temperature Control**

Voltage Control*

Power Factor

** - Includes Overides for Day of Week (DOW), Voltage Overide & DOW

& Voltage Overide

* - Includes DOW Overide

• Memory records of switch operations and 15-minute analog data for graphing.

• RS-232 port to communicate with a PC.

• Voltage from standard 120 volt secondary Power Transformers (PT’s).

• Current from a Fisher Pierce 60:1 LPCS or Lindsey Current Sensor with a [600

Amps]:[10 Volt] Ratio or a Generic Current Sensor

• 5 amp secondary Current Transformer (CT) as a possible input source.

2.2 VAr-min Electrical Features

2.2.1 Oil Switches

Capacitor banks are connected to power lines via any suitable manufacturer’s oil

or vacuum switches used for capacitor controls. These switches are configured to

be operated from two separate 120 volt signals. A series auxiliary switch

mounted inside the switch motor housing is operated in tandem with the main

switch such that only the signal input will toggle the unit to the opposite position

and will apply power to the motor. This allows continuous application of the 120

volt signal to either of the 2 inputs.

2.2.2 Capacitor Control Relays

A capacitor control applies two 120 volt signals via two relays. These relays are

rated at 30 amps, 250 VAC.



2.2.3 Oil Switch Position Detection

Oil switch position detection is accomplished by sensing the neutral voltage

through the oil switch motor and through one contact of the auxiliary switch.

This sensing technique can be defeated if the switch is operated using the

control lever on the side of the tank since the motor position would not change.

2.2.4 Line Voltage Measurement

Line voltage is monitored by a precision resistor bridge. This bridge uses a 475

kΩ resistor and a 4.02 kΩ resistor. This produces a 1/120 ratio. Varistors and

capacitors on the pc board are used protect the inputs from surges and component

failures.

2.2.5 Current Measurement

A Fisher Pierce Series 1301 LPCS or a Lindsey 9600 Series LPCS with a 600:10

shunt resistor or a 5-amp secondary CT is used to sense line current. The output

from this device is monitored directly by the capacitor control unit. The

Companion Software package allows the user to set the hardware front end

processor to compensate for current sensor phase shift.

2.3 VAr-min Functions

2.3.1 Control

The capacitor control unit will operate relays to control the opening and closing

cycles of the oil switches. Pre-programmed control algorithms allow the capacitor

control to make decisions based on measured and calculated electrical parameters

to determine when to operate the relays. The VAr-min has been designed with

several software checks to prevent excessive operation of the oil switches.

2.3.2 Data Collection

The VAr-min provides fifteen (15) minute averages of voltage, current, phase

angle, oil switch position and temperature. These averages are maintained for

periodic retrieval. The internal memory allows the data storage (up to a maximum

of 273 days) to be saved in single-phase data collection.



3.0 Installation

3.1 Inspection

Each unit should be visually inspected for any loose parts or damage after

shipping. All electrical screw connections and mounting bolts should be

tightened since shipping can cause loosening.

3.2 Physical Mounting

Control cable units are intended to be mounted to a flat surface using four

corner bolts or to a pole using a standard mounting plate. Meter base units

are ring type. See the Schematic Diagram on the inside of the VAr-Min

door of your capacitor control unit for the wired pin configuration or Refer

to other supplied data for pin configuration. When a control cable is used,

it is brought in through a circular connector in the bottom of the box.

3.3 Temperature Sensor (Optional)

The VAR-min Temperature Sensor should be installed on the bottom of

the Nema Housing after inspection. The circular connector features a

mechanical polarizing position. Rotate the connector until mated and

secure the connector in place by rotating until locked.

Temperature

Sensor



3.4 Connections (Meter Base Options)

Diagrams are shown looking into the wired meter base (not looking at back of control)



4.0 Display Menu

4.1 Menu System & Manual Operator Controls

The 16x2 LCD display on the front panel provides the operator with the inform-

ation about the options, selections and data for the instrument. The information is

contained within a pre-programmed menu system making the setup and con-

figuration quick, easy and consistent. The operator moves through the menu

system via two controls; a rotating switch (Modify) which provides the paths and

selections through the menu, and momentary switch (Enter) which by pressing

will select or confirm the choice selected by the operator. This information is then

passed to the microcontroller and the appropriate actions are taken in response to

the operators commands.

Although the VAr-Min can be programmed through Companion Software

(refer to the Capacitor Controls Software User’s Guide), programming

through the front panel interface is a quick and easy method which covers

the majority of switched bank situations. An internal wizard program

accepts all necessary information about the site and generates an

appropriate algorithm.

All manual operator program modifications are performed using the Enter

button, Modify knob and Display located on the front panel.

4.1.1 Manual Operation Controls

The 16x2 LCD display shows important real-time information as well as

program parameters. The Modify knob is used by the operator to select

various menu functions by rotating through various menu options and the

Enter button is used to ‘select or confirm’ operator menu setting.



4.1.2 Toggle Switches and LEDs

In addition to the programming controls, there are two toggle

switches and two LEDs which allow direct and immediate control

of capacitor switch states and operating modes.

4.1.2.1 Toggle Switches

There are 2 toggle switches on the front panel:

• Auto/Manual – Sets the operating mode of the capacitor control.

In the Auto (up) position the VAr-Min will employ the programmed

algorithm to control the Capacitors. In this position the Close/Trip switch

is disabled.

In the Manual (down) position, the internal algorithm is disabled and the

Close/Trip switch is enabled.

• Close/Trip – Directly operates the cap bank switches when the

Auto/Manual switch is in the Auto position. This is a momentary (center

position off) switch.

Pressing the switch up toward the Close position will cause the control to

initiate the Close process.



There is an automatic 20 second delay before the

close relay is activated. This is to allow the user

to step away so as not to be directly underneath

the capacitor bank when switch-on occurs. In

addition, there is a 5 minute delay after the

switches have been opened before they can be

switched on again. This is to allow time for the

charge on the capacitors to bleed off.

Pressing the switch down toward the Trip position, will cause the control

to initiate the Trip process. There is an automatic 3 second delay before

the trip relay is activated.

4.1.2.2 LED’s

There are 2 LEDs on the front panel:

Auto/Manual LED Indicator

• Amber – Shows Automatic/Manual mode of operation.

Amber LED will be ON when the VAr-min is in Auto mode.

The Amber LED will Blink ON/OFF 3 times after user puts the

Auto/Manual switch in the Auto position.

The Amber LED will Blink ON/OFF continuously when the algorithm

has been disabled by the anti-oscillate protection feature.

Trip/Close/Smart Switch Sense LED Indicator

• Trip/Close/Smart Switch Sense LED – Shows Capacitor Switch status.

Red LED will be ON when the switches are closed.

Green LED will be ON when the switches are open.

Red LED will begin Blinking Green when the Trip process has been

initiated.

Green LED will begin Blinking Red when the Close process has been

initiated.



Smart Switch Sensing

VAr-Min Capacitor Controls with F/W version

7.32 and greater now have an improved Visual

alert system to notify the operator of several

different switch failure mechanisms as well as

switch cable integrity.

This new alert consists of both a blinking LED

and the type of failure displayed in the parametric

data area of the LCD display.

• Smart Switch Sensing

The Red/Green LED also indicates various switch related failure issues.

These are identified as follows:

o Switch Control Mechanism Failure

The Trip/Close LED will have an “orange” appearance. The LED

duty cycle will be ON most of the time and blink OFF for a very

small amount of time.

This condition indicates that the switches are reporting both trip

and close conditions simultaneously.

o Switch Control Cable Failure

The Trip/Close LED will have an “orange” appearance. The LED

duty cycle will be OFF most of the time and blink ON for a very

small amount of time.

This condition indicates that there is a potential problem with the

cabling between the capacitor control and the system capacitor

switches. The Capacitor Switch position cannot be determined.



4.2 Basic Flow Diagram

The following illustration provides a high level look at the basic menu flow.

Each of the menu processes will be discussed in greater detail in the following

paragraphs.



Figure 1 Version Display

Figure 2 Unit ID Menu

Figure 3 Volts/Amps/Phase Menu

Figure 4 Control KVar

Figure 5 Control KVar w/ORide

Figure 6 V/F Tripping

Figure 7 Scada Address

Figure 6 Date Selection

Figure 7 Time Selection

4.3 VAr-min Menu Items

4.3.1 Menu Display Types

There are 3 types of fields in the various items:

Power Unit ON

Display Indicates

Company Product

Software Revision

Unit ID &

Cycle Information

Volts, Amps and

Phase Degree Information

Control on Parameter

Display/Change

Date

Parameter

Overrides & Setups

Display/Change

Time

V/F Tripping

Set Scada Address

Displayed

ONLY at

Power ON



• Read Only - These are monitored values, status indications, etc. They

cannot be changed by the operator because they are data.

• Changeable - These are operating parameters which govern the

automatic functions of the capacitor control. They are saved in non-

volatile memory within the VAr-min unit.

• Software Protected - These are parameters which can only be changed

through the Companion software.

4.3.2 ID & Number of Operations (Software protected)

This information is presented in the first screen. The Number of Operations value

will increment after each Trip operation.

The Number of Operations counter can only be

reset to zero through the Companion Software.

The Unit ID can only be changed through the

Companion Software.

4.3.3 Electrical Values (Read Only)

These screens allow the user to monitor real-time electrical parameters such as:

Voltage - PT secondary: 120 VAC nominal

Current - Single-phase Amps

Kilowatts - Single-phase kW × 3

KiloVARs - Single-phase kVAR × 3

Phase Angle - In units of degrees

Power Factor - In units of %

4.3.4 Control Method (Changeable)

The VAr-Min uses this parameter to determine what type of model to use in

generating the control algorithm. This algorithm is used by the control program

to make decisions about operating the relays which drive the oil switches.

Rotate the Modify knob then press the Enter button to make the selection.



There are 6 choices including:

• Control on kVAr

• Control on Time

• Control on Temp

• Control on Time/Temp

• Control on Voltage

• Control with Algorithm

Each of these will cause the Algorithm Wizard to build a different algorithm

structure. This structure can then be modified by Override parameters (Section

4.3.6).

• Controlling on kVAr causes the Wizard to use the capacitor 3 phase bank

size to create high and low kVAr set points. The set points are used to turn

the bank ON when the measured kVAr is lagging by 2/3 bank size and to

turn the bank OFF when the kVAr is leading by 2/3 bank size. This allows a

hysteresis of 1/3 bank size.

Example:

If the capacitor bank size is 600 kVAr, the Wizard will build an algorithm

which will turn the bank ON at kVAr +400 kVAr (+ is lagging, - is

leading) and OFF at –400 kVAr. Since the measured kVAr will drop 600

when the bank turns on, the measured reactive power will change to –200

kVAr. The load now must go less lagging (till the measured kVAr reaches

–400) before the VAr-Min will turn off the bank. This is a hysteresis of

200 kVAr (1/3 of 600).

• Controlling on Time of day is straightforward. The user specifies the Time

of Day (TOD) to turn the capacitor bank on and another TOD to turn the

bank off. The two TOD values are programmed into the algorithm and the

capacitor control uses them to turn the bank on once and off once each day.

• Controlling on Temperature is straightforward. The user specifies the

Temperature to turn the capacitor bank on and another Temperature to turn

the bank off. The two Temperature values are programmed into the

algorithm and the capacitor control uses them to turn the bank on and off as

these temperatures limits are met. There is a 2 degree delta built in to

prevent unwanted oscillations.

• Controlling on Time/Temperature is straightforward. The user specifies the

Time of Day (TOD) to turn the capacitor bank on and another TOD to turn

the bank off. Then the user specifies the Temperature to turn the capacitor

bank on and another Temperature to turn the bank off. These Time and

Temperature values are programmed into the algorithm and the capacitor



control uses them to turn the bank on and off each day based upon

temperature set points. There is a 2 degree delta built in to prevent

unwanted oscillations.

• Controlling on Voltage, the Wizard gets the upper and lower limit voltages

from the user and then creates an algorithm which will turn the bank

switches on when the voltage drops below the lower limit and on when the

voltage rises above the upper limit.

• The Control with Algorithm function means that the VAr-Min will employ

an algorithm which has been programmed through the Companion Software.

4.3.5 Capacitor Bank Size (Changeable)

The VAr-Min uses this value to determine the upper and lower kVAr limits

when Control on kVAr is selected as the control method. This screen only

appears when Control on kVAr is activated. Rotate the Modify knob then press

the Enter button to set this value.

4.3.6 Override Method (Changeable)

The VAr-Min uses this parameter to determine what type of modifications to

use in generating the control algorithm. These parameters are not used when

Control with Algorithm is selected. Rotate the Modify knob then press the

Enter button to make the selection.

The choices vary depending on Control Method:

• No Override

• Day of Week Override can be used with kVAr, Time, Temperature or

Temperature/Time or Voltage Control

• Voltage Override can be used with kVAr, Time, Temperature or

Temperature/Time Control

• DOW & Voltage Override can be used with kVAr, Time,

Temperature or Temperature/Time Control

These overrides place some important limitations on the normal functions of the

selected Control Method.

• Inclusion of Day of Week Override cause the Wizard to build an algorithm

which will keep the Capacitors off on Saturday, Sunday and any pre-

programmed holidays. Voltage Control or Voltage Override will take

precedence over DOW Override if the measured voltage gets out of range.



• Voltage Override employs the use the Voltage with Correction parameters.

Each time the VAr-Min operates the bank switches, it monitors the voltage

change that occurs. It keeps a running average of the changes and in this

way learns how to predict what the voltage will be after the bank switches

change state.

The Wizard gets the upper and lower limit voltages from the user and then

creates an algorithm which first verifies that the resulting value will remain

within limits after switching before allowing the Control Method to operate.

It will also initiate appropriate switching independently of the Control

Method when voltages fall outside of the programmed limits.

4.3.7 Voltage Override (Changeable)

This allows the user to set the upper voltage limit for either Voltage Control, or

Voltage Override. Rotate the Modify knob then press the Enter button to set this

value.

4.3.8 Voltage Underride (Changeable)

This allows the user to set the lower voltage limit for either Voltage Control, or

Voltage Underride. Rotate the Modify knob then press the Enter button to set this

value.

4.3.9 Turn-on Time (Changeable)

This allows the user to set the time of day for switch bank turn-on. Rotate the

Modify knob then press the Enter button to set this value.

4.3.10 Turn-off Time (Changeable)

This allows the user to set the time of day for switch bank turn-off. Rotate the

Modify knob then press the Enter button to set this value.

4.3.11 Date & Time Menu Selections

These menu items allow the user to set & display the Date and Time (Hr:Mn) and

the day of the week (DOW). Time should be set to local time in military time (0 –



23 hours). The week day is 1 for Monday, 6 for Saturday and 7 for Sunday.

There is no provision for daylight savings time.

4.3.12 Add V/F (Voltage/Frequency) Tripping Menu Selections

This menu item allows the user an efficient method of tripping the switches on a

pre-selected voltage and frequency setting.

The default settings for V/F Tripping are as follows:

Voltage Trip when Volts < 95 Volts or Volts > 140 volts

Frequency Trip when Frequency < 59 Hz or Frequency > 61 Hz

4.3.13 Scada Address Menu Selections

These menu item allows the user to set the scada address for each capacitor

control on there particular scada system. Each VAr-Min must be assigned a

unique address for proper operation.

4.3.14 Additional kVAr setup information (LPCS Selection/Position)

When using the Control on kVAr algorithm, the user must also install a Line Post

Current Sensor (LPCS) to measure the current flowing through the conductor.

Select the proper LPCS from the list as well as make the determination as to the

position of the LPCS with respect to the capacitors. Ideally, the LPCS should be

mounted between the Source side (substation side) and the capacitors. In this case

the LPCS is Upline from the Capacitors. If the capacitors are located between the

source (sub station) and the LPCS, then the LPCS is considered downline from

the capacitors. The capacitive effects are not seen be the LPCS in a downline

configuration, as the LPCS can only see effects downstream from its installed

position.



5.0 Manual Programming & Flow Charts

5.1 Programming Flowcharts

The following flowcharts represent how to manually program the VAr-min using the

front panel controls. These charts are meant to provide the user with a simple high level

visual understanding of the flow and how the controls are used by the operator in

performing the setup process.



VarMin Ver x.xx

Xxx x-xx Amps

Unit ID xxxx

Operations xxxx

Enter

Volts Freq

xxxx xxxx

Volts Amps Pf

xx xx x

Kw KVar Deg

xx xx x Primary kVA

x xx

Control On

kVAr

Control On

Time

Control On Temp

Control On

Time/Temp

Control On

Volts

Modify

Control On Temp

No Override

Control On Temp

w/ DOW Override

Control On Temp

w/ DOW & Voltage

Control On Temp

w/ Volt Override

Valquest Systems, Inc.

VAr-min Programming Card

Control On Volts

No Override

Control on Volts

w/ DOW Override

Amb Indoor

Xxx xx

Control On Time/Temp

No Override

Control On Time

No Override

Control On Time

w/ DOW Override

Control On Time

w/ DOW & Voltage

Control On Time

w/ Volt Override

Control On kVAr

No Override

Control On kVAr

w/ DOW Override

Control On kVAr

w/ DOW & Voltage

Control On kVAr

w/ Volt Override


w/ DOW Override Control On Time/Temp

w/ DOW & Voltage


w/ Volt Override

Control with Algorithm

(S/W Feature)

Condition Stable

00:00

Informational

Display

User

Selection



Enter Control On kVAr

Modify

Valquest Systems, Inc. VAr-min (kVAr) Programming Card

Control On kVAr

No Overide

Control On kVAr

w/ DOW Override

Control On kVAr

w/ DOW & Voltage

Control On kVAr

w/ Volt Override

Capacitor Bank

xxx kVAr

kVAr Close Open

xxx xxx

LP Sensor Type

F Pierce 1301x7A PT= Ph-N

LP Sensor Type

F Pierce 1301x7A PT= Ph-Ph

LP Sensor Type

xxx Deg Generic

Primary Voltage

xxx Volts

Transient Delay

xxx Sec

Use V/F Trippng

Set Scada Address

Adjust kVAr

Adjust kVAr

Adjust Volts

Adjust Seconds

Voltage Override

xxx Volts

Voltage Underride

xxx Volts

Adjust Volts

Adjust Volts

If kVAr w/ Volt Override or kVAr w/DOW & Voltage (Insert in

Informational

Display

User

Selection

Sensor Position

UP-line from Caps

Sensor Position

Downline from Caps

LP Sensor Type

F Pierce 1301x1A PT= Ph-N

LP Sensor Type

F Pierce 1301x1A PT= Ph-Ph

LP Sensor Type

Lindsey Multicore PT= Ph-N

LP Sensor Type

Lindsey Multicore PT= Ph-Ph

Date

Time

To Menu Top



Control On Time

Control On Time

No Override

Control On Time

w/ DOW Override

Control On Time

w/ DOW & Voltage

Control On Time

w/ Volt Override

Turn On Time

Mil x.xx

Turn Off time

Mil xxx

Transient Delay

xxx Sec

Adjust Time

Adjust Time

Adjust Seconds

Voltage Override

xxx Volts

Voltage Underride

xxx Volts

Adjust Volts

Adjust Volts

Enter

Modify

Informational

Display

User

Selection

Valquest Systems, Inc. VAr-min (Time) Programming Card

Use V/F Trippng

Set Scada Address

Date

Time

To Menu Top



Control On Temp

Control On Temp

No Override

Control On Temp

w/ DOW Override

Control On Temp

w/ DOW & Voltage

Control On Temp

w/ Volt Override

Turn On Temp

xxx Degrees F

Turn Off Temp

xxx Degrees F

Transient Delay

xxx Sec

Adjust Degrees

Adjust Degrees

Adjust Seconds

Voltage Override

xxx Volts

Voltage Underride

xxx Volts

Adjust Volts

Adjust Volts

Indoor Temp Lag

x Minutes

Adjust Minutes

Enter

Modify

Informational

Display

User

Selection

Valquest Systems, Inc. VAr-min (Temp) Programming Card

Use V/F Trippng

Set Scada Address

Date

Time

To Menu Top





No Override


w/ DOW Override


w/ DOW & Voltage


w/ Volt Override

Voltage Override

xxx Volts

Voltage Underride

xxx Volts

Adjust Volts

Adjust Volts

Transient Delay

xxx Sec

Adjust Seconds

Indoor Temp Lag

x Minutes

Adjust Minutes

Turn On Time

Mil x.xx

Turn Off time

Mil xxx

Adjust Time

Adjust Time

Turn On Temp

xxx Degrees F

Turn Off Temp

xxx Degrees F

Adjust Degrees

Adjust Degrees

Enter

Modify

Informational

Display

User

Selection

Valquest Systems, Inc. VAr-min (Time/Temp) Programming Card

Use V/F Trippng

Set Scada Address

Date

Time

To Menu Top



Control On Voltage

Control On Voltage

No Override

Control On Voltage

w/ DOW Override

Voltage Override

xxx Volts

Voltage Underride

xxx Volts

Adjust Volts

Adjust Volts

Transient Delay

xxx Sec

Adjust Seconds

Enter

Modify

Informational

Display

User

Selection

Valquest Systems, Inc. VAr-min (Voltage) Programming Card

Use V/F Trippng

Set Scada Address

Date

Time

To Menu Top



The following charts represent how to manually program the VAr-min using the front

panel controls along with actual display data to assist in setting up the VArmin for

operation. Refer to the following table for graphic symbol and definition in

understanding the proceeding flowcharts.

Symbol Definition

This symbol (shaded box) is used to

represent information which is not

Front panel modifiable to the user.

The information is used to present

current parametric data to the user.

This symbol represents an

automatic menu change. It is used

after power up to change from the

Version display to the S/n and # of

operations display.

This symbol represents a user

pressing the “Enter” momentary

switch to enter or change a display

setting.

This symbol represents a user

rotating the “Modify” encoder knob

to change a display setting to a

different user selection and/or value

followed by pressing the “Enter”

momentary switch.

This symbol represents a menu item

that is a user changeable setting

using the “Modify” knob.



5.1 Parametric Information Displays

The parametric informational displays are those display items which are used to present

parametric data and real-time measurements to the user. These displays may not be

altered or modified by the user from the front panel.

VarMin Ver x.xx

Xxx x-xx Amps

Unit ID xxxx

Operations xxxx

Volts Freq

Volts Amps Pf

kWatts KVAr Deg

Primary kVA

Ambient Indoor

Condition Stable

00:00



5.2 Control on kVAr Programming

5.2.1 kVAr (No Override)

5.2.2 kVAr with DOW Override

VarMin Ver x.xx

Xxx x-xx Amps

Unit ID xxxx

Operations xxxx

Volts Freq

xxxx xxxx

Control On kVAr

Control On kVAr

No Override or DOW Override

Sensor Position

Capacitor Bank Size

Date

Time

kVAr Close/Open

Primary Voltage

Transient Delay

Use V/F Tripping

Set Scada Address

Sensor Type



5.2.3 kVAr with Voltage Override

5.2.4 kVAr with DOW & Voltage

\

(Continued from prior sheet)

VarMin Ver x.xx

Xxx x-xx Amps

Unit ID xxxx

Operations xxxx

Volts Freq

xxxx xxxx

Control On

kVAr

Control On kVAr

Voltage or DOW & Voltage Override

Capacitor Bank

kVAr Close/Open

Sensor Type

Primary Voltage

Voltage Override

Voltage Underride

Sensor Position



Transient Delay

Date

Time

Use V/F Tripping

Set Scada Address



5.3 Control on Time Programming

5.3.1 Time (No Override)

5.3.2 Time (with DOW Override)

VarMin Ver x.xx

Xxx x-xx Amps

Unit ID xxxx

Operations xxxx

Volts Freq

xxxx xxxx

Control On Time

Control On Time

No Override or DOW Override

Turn ON Time

Turn OFF Time

Transient Delay

Date

Time

Use V/F Tripping

Set Scada Address



5.3.3 Time with Voltage Override

5.3.4 Time with DOW & Voltage

VarMin Ver x.xx

Xxx x-xx Amps

Unit ID xxxx

Operations xxxx

Volts Freq

xxxx xxxx

Control On Time

Control On Time

Voltage or DOW & Voltage

Override

Voltage Override

Voltage Underride

Turn ON Time

Turn OFF Time

Transient Delay

Date

Time

Use V/F Tripping

Set Scada Address



5.4 Control on Temperature Programming

5.4.1 Temperature (No Override)

5.4.2 Temperature with DOW Override

VarMin Ver x.xx

Xxx x-xx Amps

Unit ID xxxx

Operations xxxx

Volts Freq

xxxx xxxx

Control On Temperature

Control On Temp

No Override

or DOW Override

Turn ON Temperature

Turn OFF Temperature

Transient Delay

Indoor Temperature Lag

Date

Time

Use V/F Tripping

Set Scada Address



5.4.2 Temperature with Voltage Override

5.4.4 Temperature with DOW & Voltage

VarMin Ver x.xx

Xxx x-xx Amps

Unit ID xxxx

Operations xxxx

Volts Freq

xxxx xxxx

Control On Temp

Control On Temp

Voltage or DOW & Voltage Override

Voltage Override

Voltage Underide

Turn ON Temperature


Transient Delay


Date

Time

Use V/F Tripping

Set Scada Address



5.5 Control on Time/Temperature Programming

5.5.1 Time/Temperature (No Override)

5.5.2 Time/Temperature with DOW Override

VarMin Ver x.xx

Xxx x-xx Amps

Unit ID xxxx

Operations xxxx

Volts Freq

xxxx xxxx



No Override or DOW

Override

Turn ON Time

Turn OFF Time

Turn ON Temperature


Transient Delay


Date

Time

Use V/F Tripping

Set Scada Address



5.5.3 Time/Temperature with Voltage Override

5.5.4 Time/Temperature with DOW & Voltage

VarMin Ver x.xx

Xxx x-xx Amps

Unit ID xxxx

Operations xxxx

Volts Freq

xxxx xxxx



Voltage or

DOW & Voltage Override

Turn ON Time

Turn OFF Time

Turn ON Temperature


Voltage Override

Voltage Underride



(Continued from prior sheet)

Transient Delay


Date

Time

Use V/F Tripping

Set Scada Address



5.6 Control on Voltage Programming

5.6.1 Voltage (No Override)

5.6.2 Voltage with DOW Override

VarMin Ver x.xx

Xxx x-xx Amps

Unit ID xxxx

Operations xxxx

Volts Freq

xxxx xxxx

Control On Volts

Control On Volts

No Override Or

DOW Override

Set Voltage Override

Set Voltage Underride

Transient Delay

Date

Time

Use V/F Tripping

Set Scada Address



5.7 Control with Algorithm

( To Be Added In Future Release )



5.8 Setting the Date & Time

Figure 6 Date Setup/View Display

Figure 7 Time Setup/View Display

The Date & Time are used for

accurate Switch Control and

gathering historical data. These

items must be set properly before

using the device to function

correctly.

Menu

Display Indicates

Date

Date

Correct?

Display Indicates

Time

Time

Correct?

Display Indicates

Unit ID & Operations

Menu Start

Press Enter for 2

Seconds

Cursor appears under

Month (Mo)

Rotate Modify to

change (Mo) or press

Enter go to Day (Day)

Rotate Modify to

change (Da) or press

Enter to go to Year

(Yr).

Rotate Modify to

change (Yr) or press

Enter to continue

Press Enter for 2

Seconds

Cursor appears under

Hour (Hr)

Rotate Modify to change

(Hr) or press Enter to

go to Minutes (Min)


(Mn) or press Enter to

go to Day of Week

(WK).


Day of Week (WK) or

press Enter to Continue

N

N



6.0 (Reserved)

7.0 Control Algorithm

7.1 Algorithm Description

The Capacitor Control uses a Control Algorithm to make decisions about operating the relays

which, in turn, drive the capacitor switches. The Open Steps are used to form an internal flow

chart when the switches are open, while the Closed Steps are used when the switches are closed.

Up to 10 steps may be programmed for each condition although as few as 1 is adequate.

Each step is a statement which can be either true or false at any given time. The Capacitor

Control can take one of three actions depending on whether the statement is true or false:

1. Leave the capacitor switches as they are

2. Start or continue the process of toggling the capacitor switches

3. Check subsequent step(s) for additional condition information and directive

There are five fields in these steps. They are:

• Parm V/Cor, Volt, Cur, kW, kVAr, PF, Temp, Time, Date, DOW

• Eq >, <, =

• Value A numeric field

• True Open, Close, Next, Skip

• False Open, Close, Next, Skip

These define the logical decision steps in the internal flow chart. The first three form the

equation or statement which will be true or false. Fields True and False determine what to do in

either case.

Parm

V/Cor is voltage with correction - the predicted voltage after switching based on previous

operations.

Volt is the measured voltage.

Cur is the measured current.

kW is the an estimate of three phase kW calculated by 3 times the measured single phase

kW.

kVAr is the an estimate of three phase kVAr calculated by 3 times the measured single phase

kVAr.

PF is the measured power factor represented in percent.

Temp is the measured temperature in degrees Fahrenheit

Time is time of day represented in military numbers i.e. 10:30 PM would be 2230.

Date is date represented my month * 100 + day i.e. July 4 would be 704.

DOW is the day of week where weekdays Monday-Friday are 1-5, Saturday-Sunday are 6-7

and Holidays are user defined as 0, 8 or 9.



Equality Definitions

> means greater than.

< means less than.

= means equal to.

Value is a number in similar units that Parm must be greater than, less than, or equal to such that

the statement evaluate as True or False.

True and False

Open directs the unit to open the oil switches or keep them open.

Close directs the unit to close the oil switches or keep them closed.

Next means the unit should evaluate the next step for its directive.

Skip is used like Next but causes the unit to skip the very next step and evaluate the one after

that.

Naturally, the flow chart ends when a step has Close and Open in fields True and False (not

necessarily respectively). The defined flowchart process is run at an interval of once each

second.



7.2 Algorithm Environment

7.2.1 Operation Delay

A programmable operation Delay is associated with each of the operations Close and Open.

These are to avoid having surges, spikes or other electrical transients cause the Capacitor Control

to operate the switches erroneously. These delays reflect the amount of time in seconds that the

condition for operation must continuously exist before causing the operation. These delays are

set in the Timing Parameters screen and are defaulted to 120 seconds.

7.2.2 Operation Inhibits

In addition there are some operation inhibit times. One of these is an Anti-Oscillate inhibit

intended to limit negative effects of an oscillating algorithm. The other is a Capacitor-

Discharge inhibit which is imposed after a trip operation. This is defaulted to 5 minutes.

Controls with firmware version 6.0 or higher allow the operator to program these through the

Companion Software. With these later versions, the anti-oscillate can be disabled. The cap-

discharge inhibit can be either 5 or 10 minutes but cannot be disabled. The anti-oscillate can be

defeated by going to the Manual mode but the cap-discharge inhibit cannot be defeated.

7.2.3 Configuration Constants

Several Hardware Configuration constants affect the calculations made in the course of running

the algorithm. These include:

Primary Phase-Neutral Voltage default: 7200 Volts

Secondary Voltage default: 120 Volts

Nominal Line Frequency default: 60 Hz

Current Sensor Type default: Fischer-Pierce 1301-x7A Line Post Sensor

Current Sensor Ratio default: 60 Amps / Volt

Current Phase Shift default: 0° (90° is inherent to compensate the default

sensor)

Max Expected Line Current default: 180 Amps

Power Direction default: Positive (uses absolute value i.e. power always

positive)

Delta-V Learn Mode default: On (learns how much the voltage changes at

switching)



7.3 Algorithm Example

The following example is a set of switching logic that form an algorithm upon which all actions

will be decided. This is a typical algorithm known as VAR Switching with Voltage Override.

Switches Open Switches Closed

Step T F Step T F

0 VCor < 127.0 N O 0 Volt > 128.0 O N

1 KVAr > 400 C O 1 KVAr < - 400 O C

Suppose the following conditions: A 600 kVAr Capacitor bank has switches Open. Voltage is

122.9 and KVAr is 422 (positive kVAr is lagging). Learned delta-V for Close is 1.8 Volts. (At

this point only the switching logic under the Switches Open heading will be evaluated.)

Switches Open - Step 0

The capacitor control will begin evaluation at Switches Open - Step 0. Observing Step 0, we

find that the present voltage of 122.9 plus the delta-V of 1.8 volts is less than the stated cutoff

condition voltage of 127.0 volts shown in Step 0. Therefore the logic evaluates True. The step

taken under True is Next indicating that Switches Open - Step 1 will now be evaluated. If the

voltage sum were higher than 127.0, then Step 0 would have evaluated False. The action under

False would have been to stay Open, and evaluation would terminate. One second later this

same step would be evaluated again.

Switches Open - Step 1

The capacitor control has now advanced from Step 0 by the Next action. We see that the present

kVAr of 422 is greater than 400, which evaluates True. The action initiated would then be to

Close the capacitor bank (after this condition exists for the Close Operation Delay Time). Once

the bank is closed, the steps under the Switches Closed heading are evaluated. If the present

kVAr were less than 401, the logic would have evaluated False. The action under False would

have been to stay Open, and evaluation would terminate. One second later Switches Open -

Step 0 would be evaluated again.

Suppose the following conditions: The 600 kVAr Capacitor bank is Closed. Voltage is 122.9

and kVAr is –422 (negative kVAr is leading).

Switches Closed - Step 0

The capacitor control now begins evaluation at Switches Closed - Step 0. Observing Step 0, we

find the present voltage of 122.9 is less than 128.0, which evaluates False. The action taken

under Step 0 for False is to go to the Next step (Step 1 under Switches Closed heading). If the

voltage had been greater than 128.0 volts, the logic for Step 0 would have evaluated True. In

which case, the action initiated under True would be to Open the capacitor bank if this condition

persisted for the Open Operation Delay Time.



Switches Closed - Step 1

The capacitor control unit having taken a Next action in Step 0 now begins evaluation of Step 1.

Notice logic states the kVAr must be less than cutoff point of -400 to be evaluated True. Since

the present kVAr is -422, which is less than -400. The step is evaluated True, and the step taken

is Open. If the kVAr had not been less than -400, Step 1 would have evaluated False. The

action taken under False would have been to stay Closed, and evaluation would terminate. One

second later Switches Closed - Step 0 would be evaluated again..

Note 1: It is necessary that the actions in the final step of both the Switches Close and Switches

Open must either be Open or Close for both the True and False sub-fields. Under no

circumstances is there to be a Next action in the last step. Doing so will cause unpredictable

switching behaviors in the controls for which we cannot be responsible.

Note 2: A software safety feature in the VAr-Min will only allow one Open or Close operation

per hour.

Note 3: Upon 10 consecutive switching operations in 10 hours (1 operation per hour), a software

safety feature internal to the control will disable the algorithm.



8.0 Electrical Parameter Measurement Theory

Measurement of electrical parameters (i.e. voltage, current, kW, kVAR, etc.) has traditionally

been accomplished for SCADA systems by the use of analog transducers. The capacitor controls

system takes a completely different approach. The definitions of RMS voltage and current are:

VT

v dtT

rms

/

=

∫

1 21 2

0 and I

Ti dt

T

rms

/

=

∫

1 21 2

0

where v and i are instantaneous voltage and current values and T is the time equal to one period

of a repeating waveform.

These RMS calculations are independent of wave shape thus allowing accurate measurements

when harmonics are present as sometimes occurs when power factor correction capacitors are

used for inductive loads.

The definition of power is simply:

PT

v i dtT

= ⋅

∫1

0

1 2/

Again, this equation produces an accurate power calculation regardless of wave shape of either

voltage or current.

Taking instantaneous voltage and current readings at a high rate, the capacitor controls calculate

these three parameters using a proprietary time based algorithm for each phase being monitored.

kVAR and power factor are calculated using the equations:

VAR = ⋅ −V I Prms rms2 2 and pf =

⋅

P

V Irms rms

Phase angle is ACOS(pf). Sign is determined by integrating voltage shifted by 90° (of the

fundamental frequency) and current over a period.

This information is then stored and passed to the retrieving computer via the communications

system where it is massaged and formatted as needed.

Direct questions to: Valquest Systems

351 S. Sherman, Suite 100

Richardson, Texas 75081

Phone: 972-234-2954

Fax: 972-238-95



9.0 Typical Installation Diagram

Current

All Components should

star grounded at

Neutral Support

Earth ground should

rod set at least 8

The LPCS junction box

necessary for a

Pierce LPCS which

use a connector.

LPCSs or CTs may

need this

MiniCap

C

T

N

I

V

Clos

Trip

Neutra

120

Notes

2.

1.

deep

3.

I

not

H

A Line Post Current

B LPCS Junction

C Service

E Main Junction

F Neutral

G Capacitor

H MiniCap Control

D Oil

I Ground

Component

D

B

A

E

F

D

C

Active Control,

Pictorial

T. Landes

Xfmr

Main Junction

MiniCap Pole

0126-06-

12-31-

C T N I V

To

OS1 OS2

LPCS G W B

OS3 Neut

1 1

G

D

Capacitor Control Configuration

Pictorial Diagram

T. Landes

0126-06-01

12-31-91

Valquest Systems, Inc.

Cap Control Connections

C Close T Trip N Neutral I Current Signal V 120 VAC

Notes:

1. All components should be star grounded at the Neutral Support Point.

2. Earth ground should be a rod set at least 8 feet deep.

3. The LPCS junction box is necessary for a Fisher-Pierce LPCS which does not use a connector. Other LPCS’s or CT’s may not need this box.

Components

A Line Post Current Sensor B LPCS Junction Box C Service Transformer D Oil Switches E Main Junction Box F Neutral Support/Connector G Capacitor Bank H Capacitor Control Unit I Ground Rod

Main Junction Box To Cap Controller

Note:

For Phase Angle to be correct, the Voltage and Current Sensors should come from the same phase.



10.0 VAr-Min Features & Specifications

VAr-Min is …

An Automatic Capacitor Control

It is intended for use with 120 or 240 volt, 50 or 60Hz distribution systems. It reads voltage from the control

transformer and current from a variety of sensors. Using proprietary algorithms, it calculates:

kVAr kW Power Factor Phase Angle Voltage Current

And a Trend Recorder.

It stores the values listed above in 15 minute intervals. Working with the Valquest VMChart Software, it is able to

present user formatted graphs and tables. Recording capacity is 224 days.

VarMin Companion Software allows control setup using Wizard driven standard schemes or user defined special

algorithms. Reports, charts, tables, and graphs are a few mouse clicks away.

Features: Parameter Measurement Range Resolution Voltage 95 to 280 VAC +/- 0.2%

Current 0 to 9999 Amps +/- 0.5%

Phase Angle 0 to 359.5° +/- 0.5°

KW -9999 to +9999 kW +/- 0.5%

KVAr -9999 to +9999 kVAr +/- 0.5%

KVA 0 to 9999 kVA +/- 0.5%

Power Factor - 0.5% to +0.5% +/- 0.5%

Line Frequency 50Hz or 60Hz +/- 0.02 Hz

Temperature (Optional) 0 to150F 1 degree

Data Storage Parameters Trend Parameters Voltage, Current, Phase Angle

Derived Parameters KW, kVAr, kVA, Power Factor

Trend Period (Minutes) 15

Max Records 65536

Current Sensing Range Lindsey Line Post Sensor 0-1200 Amps

Fischer Pierce Line Post Sensor 0-1200 Amps

0-10 Amp Secondary CT 0-9999 Amps

Standard control schemes: * kVAr with Voltage override * Power factor with Current override * Temperature with Voltage override * Time with Weekend / Holidays * Time with Date modification * End of line Voltage correction

User defined control schemes based on: * kVAr * Power Factor * Voltage * Current * Date / Time / Day of week * Temperature



VAr-Min Features & Specifications (Continued)

Environmental Specifications

Condition Range

Operating Temperature -40°F to 165°F

Humidity (Non-Condensing) 0 to 100%

Operating Voltage 95 to 300 VAC

Power Usage ½ Watt

Enclosure Nema 4



11.0 About Valquest Systems

We Stand for building strong Client relationships and providing

exceptional service and products.

Our Vision is to be a leading provider of monitoring and control equipment to small electric utilities on a national basis.

Our Purpose is to improve the efficiency of electricity transmission and distribution in America.

Our Commitment is to create optimal long-term approaches for our

Clients needs.

Valquest Systems, Inc. 351 S. Sherman Street, Suite 100

Richardson, TX 75081 Voice: 972-234-2954 Fax: 972-238-9501

EMail: [email protected] Website: www.valquest.net

Valquest Systems What Sets Us Apart

VArMin Operator Manual Sept 2010 - Castle Power...

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