Ais 175 Vacuum Circuit Breaker

8/13/2019 Ais 175 Vacuum Circuit Breaker

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JL.ZANONE / G Allison E&S ind.C Page 1 13/12/2006

Indoor Medium Voltage SwitchboardsModular, air-insulated, metal-enclosed switchgear

This document is designed to help you in your specification actions.It consists of a group of texts which, when included in our customers specifications, will make itpossible to orientate them towards the NEX solution.They may be included in their entirety or partially.

* LSC2B Loss of service continuity

* * PM metallic partition

NEX17

Standard Specifications

(MV cubicle type LSC2B * Class PM **)


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13 LV AUXILIARY ......................................................... ........................................................... ............................... 18

14 USE.......... ........................................................... ............................................................ ........................................ 19

14.1 OPERATING MECHANISM ................................................................................................................................1914.2 OPERATING GUIDE ..........................................................................................................................................19 14.3 MECHANICAL SAFETY DEVICES.......................................................................................................................19 14.4 LOCKOUT FACILITIES ......................................................................................................................................20 14.5 DOCUMENTS AND TRAINING ...........................................................................................................................20

15 INSTALLATION / COMMISSIONING........................................................... .................................................. 21

15.1 TRANSPORT....................................................................................................................................................21 15.2 HANDLING AND STORAGE ...............................................................................................................................21 15.3 INSTALLATION................................................................................................................................................21 15.4 CABLE CONNECTION.......................................................................................................................................21 15.5 BUSBAR CONNECTIONS...................................................................................................................................22 15.6 EARTH COLLECTOR CONNECTION ...................................................................................................................22 15.7 LOW VOLTAGE CIRCUIT CONNECTIONS ...........................................................................................................22 15.8 COMMISSIONING .............................................................................................................................................22

15.8.1 Setting ..................................................................................................................................................2215.8.2 Testing..................................................................................................................................................22

15.9 TRAINING AND DOCUMENTS ...........................................................................................................................23

16 SERVICING AND MAINTENANCE ..................................................... ........................................................... .24

16.1 CUBICLE SERVICING .......................................................................................................................................2416.2 SWITCHGEAR SERVICING ................................................................................................................................24 16.3 PROTECTION AND CONTROL SYSTEM SERVICING.............................................................................................24 16.4 CONDITIONAL SERVICING ...............................................................................................................................24

17 COMMERCIAL TERMS .................................................... ........................................................... ..................... 25

17.1 OFFER.............................................................................................................................................................25 17.2 MANUFACTURING AND DELIVERY...................................................................................................................25 17.3 TESTING .........................................................................................................................................................26

17.3.1 Type testing .......................................................... ........................................................... ..................... 26

17.3.2 Individual series testing ....................................................................................................................26


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3 Technical characteristics

The switchgear shall be designed and tested for the following electrical values: Rated voltage: 12kV or 17,5 kV three phase. Operating voltage: 12kV or 17,5 kV. Frequency: 50Hz 60 Hz.

Insulated level: 28kV or 38 kV 50 Hz, 1 min75kV or 95kV - 1,2/50 micro sec

Busbar rated current: 1250A or 2500A Short-circuit current: 25kA or 31.5kA 3 sec Internal arc performance: 25 kA / 0.5s

4 Switchboards

The switchboards shall meet the criteria for indoor, air-insulated, metal-enclosed switchgear, incompliance with IEC 62271-200.

The environment shall be as follows: Altitude: less than 1000 m. Ambient temperature:

Minimum: -5C Maximum: +40C.

Humidity: At +20C: less than 90% At +40C: less than 50%.

The switchboards shall be modular and extensible at site.They shall comprise functional units as defined by IEC standard IEC 62271-200:part of metal-enclosed switchgear including all the main circuit and auxiliary circuit equipment thatcontributes to the performance of the same function.A functional unit will be, for example, a transformer incomer unit, a motor feeder unit, etc.The factory-made functional units shall be bolted together at the place of service.The functional unit power circuits shall be interconnected by a busbar rated to carry the maximumrated current that may flow through the switchboard.The functional unit earthing circuits shall be interconnected by a main earth collector made ofcopper, the cross-section of which shall allow the flow of the rated short-circuit current


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5 Functional units

Each functional unit shall contain all the elements needed to perform its function.The functional units shall comprise:

An air-insulated, metal-enclosed cubicle, for indoor use

A withdrawal switchgear device with vacuum breaking

A digital protection and control system

Each functional unit shall be identified by a label, which clearly indicates its function and electricalcharacteristics.The functional units shall be the following:

Overhead line incomer: by circuit breaker.Transformer incomer: by circuit breaker.Generator incomer: by circuit breaker.Switchboard coupling: by circuit breaker.Substation coupling: by circuit breaker.Busbar voltage measurement.

Busbar earthing.Overhead line feeder: by circuit breaker.Underground cable feeder: by circuit breaker.Transformer feeder: by circuit breaker.Motor feeder: by circuit breaker

3 types of connection are available in standard for incomer and feeder cubicles :

BOTTOM connection by cables. TOP Bar connection. TOP Cables connection.


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6 Cubicles

The term cubicles designates all the functional units other than switchgear and the protectionand control system, namely:

The metal enclosureThe compartment partitions

The fixed power circuitThe earthing circuit

6.1 Dimensions

The cubicle dimensions shall not be greater than the following:

6.2 Performances

The values below are given for normal operating as defined in IEC 62271-200 and IEC 60694.

Rated voltage (kV)

12 17,5

Rated insulation level

power frequency withstand voltage

50Hz - 1 min (rms kV) 28 38

lightning impulse withstand voltage

1,2/50 us (kV peak) 75 95

Nominal current and maximum short time withstand current

Functionnal unit with circuit breaker

Short time withstand current Ith. Max (kA/3s) 25 25

31,5 31,5

Rated current In max busbars (A) 2500 2500

Rated current In CB (A) 630 630

1250 1250

2500 2500

Internal arc withstand (IAC-AFLR) - option

(kA / 0,5s) 25 25


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6.3 Architecture and enclosure

The cubicles shall be for the the metal-enclosed switchgear type, in accordance with thedefinition given in IEC standard 62271-200.

The outer enclosure shall therefore be metallic and earthed.Each cubicle shall be built on a self-supporting chassis made of folded steel plates.They shall naturally be protected against corrosion, without requiring additional treatment.Since the front doors and end cover plates comprise the visible parts of the switchboard, bothsides shall be painted.They shall be made of zinc-plated steel.As standard, the paint shall be light grey in colour (RAL 9002).

6.4 Degree of protection

The cubicle shall be IP3X in accordance with IEC standard 60529:

IP3X: protection against solid bodies ~2.5 mm diameter.IP2X, protection between compartments is in accordance with IEC standard 62271-200.Against the penetration of a foreign body, a sphere 12,5 mm diam. should not pass.For the protection of the personnel, the access finger probe 12mm diameter 80mm long may enterbut maintain adequate clearance.

6.5 Internal arc withstand

The cubicles shall have internal arc withstand, verified according to IEC 62271-200, Annex A,class A accessibility.The tests have been carried out, for each type of cubicle and for each of the three powercompartments, with the LV compartment door closed.


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6.6 Compartments

The cubicles shall comprise four electrically independent compartments, in accordance with thedefinition of metal enclosed switchgear given in IEC standard 62271-200.All partitions between compartments shall be metallic and earthed.In order to ensure maximum user safety, it is imperative for the movable inter-compartmentshutters to be metallic and earthedAll the compartments shall be accessible via the front of the cubicle, rear access should bepossible to the busbar and cable compartments.Compartment access shall however be restricted by the presence of safety mechanisms andinterlocks (see section on operation).

6.6.1 Busbar compartment.The busbar compartment shall be accessible via the back of the cubicle or the top of the cubicle,by removing the bolted plates.It shall be equipped with flaps for evacuating overpressure to the top of the cubicle.

6.6.2 Switchgear compartment.

This compartment shall not be located in the bottom part of the cubicle:Withdrawable switchgear devices shall not roll along the floor.To insert or extract the switchgear device, a handling device that can be adjusted according to thefloor surface condition shall be used.The compartment shall be accessible via the front of the cubicle, by means of a door that may belocked out by a key-type lock.It shall only be possible to open the door when the switchgear device is in the racked outposition.The compartment shall be equipped with the two earthed, metallic racking in shutters which, whenthe circuit breaker is in the rack out position, shall ensure isolation from the busbar compartmentand the bottom compartment.The shutters shall be operated mechanically by the movement of the circuit breaker.When the circuit breaker is racked out, the shutters shall be mechanically locked out in the closedposition. It shall be possible for the shutters to be locked closed by padlock(s).


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6.6.3 Low voltage compartmentThis compartment shall be located in the upper part of the cubicle, on the front, and shall beincluded in the overall volume of the cubicle.It shall be accessible, with the cables and busbar energised, by means of a door that can belocked out by key-type lock.

6.6.4 Bottom compartmentAccording to the functional units, the compartment shall contain the cable connection terminals or

the lower busbar, the cable earthing switch, the current and voltage transformers.It shall be accessible via the front or rear of the cubicle by unbolting metal panels.

6.7 Fixed main circuit

The power circuit (also called main circuit) is the group of components, within a cubicle, whichparticipate in conveying power (with the exception of the switchgear devices that are discussed ina specific section: 7).Those components are:

Busbar.

Connections. Racking in contacts.

Cable connection terminals.The power circuit insulation medium shall be ambient air (type AIS).If required by the situation, sleeving may be included to reinforce insulation.

6.7.1 BusbarA copper busbar of flat formation shall ensure the flow of power within the switchboard: the barsshall be flat and parallel, supplied in unit lengths for fitting on site between adjacent cubicles.They shall be bolted to each other and to the cubicle power circuits on the operating site.For voltages of 17.5 kV or higher, sleeving may insulate the bars.

In the event of a risk of corrosion (polluted atmosphere, saline humidity), the bars should be tinplated.

6.7.2 Busbar riser/dropper connectionThese connections are the parts of the power circuit that interconnect the main components(busbar/switchgear device).Busbar connections shall be made of copper, tin plated and rated from 630A to 2500A.

6.7.3 Racking in contactsThe racking in contacts shall be made of copper with a silver plated finish.

6.7.4 Cable connection terminals

The cable connection terminals shall be located in the bottom compartment of the cubicle.They shall be made of copper.It should be possible to connect up to four XLPE type cables per phase, and the terminals shouldhave a cross-section of up to 240 mm

2for 3 core cables and 630 mm

2for single core cables.

Cable connection will be made with bolts of adequate size and stregth.Access to the cable connection compartment shall require prior closing of the cable-earthingswitch.


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6.8 Earthing circuit

The earthing circuit of a functional unit is the group of components that contribute to equipmentearthing.The component include:

The main earth collector.

Secondary collectors.

The cable earthing switch.

2 solutions will be possible for busbar earthing: An earthing truck, separate from the switchboard.

A special-purpose functional unit.

6.8.1 Main earth collectorThe main earth collector shall be made of copper and must have verified short-circuit currentwithstand, in accordance with IEC standard IEC 62271-200.The collectors of all functional units shall be interconnected and connected to the facilities mainearth grid.The earth bar shall be installed in the bottom compartment.

6.8.2 Secondary collectorsAll the metallic parts of each functional unit shall be connected to the main earth collector, bycontinuity of the metal frames, or by means of secondary collectors made of copper. Metallic partsmust never have floating potential.

6.8.3 Earthing switchThe MV cables shall be earthed by means of an earthing switch.The earthing switch shall have full making capacity (2.5 times the short-circuit thermal current forwhich the cubicle is rated) in accordance with IEC standard 62271-102.A mechanical interlock shall prevent earthing switch operation unless the main switchgear deviceis in the racked out position.

No key-type lock, padlock or electrical lockout solutions shall be acceptable for the performance ofthis function.The earthing switch operating mechanism shall be of fast-closing type, independent of theoperator.A device shall prevent the earthing switch from being opened by reflex reaction immediately afterclosing, so as to avoid all risk of arc generation between the contacts. It should be impossible forthe device to be forced.A device in the immediate proximity of the earthing switch shall inform the operator that the cablesare energised (the Voltage Presence Indicator System).This device shall include a separate neon lamp for each phase, supplied with power by anisocapacitor connected to each cable connection terminal.A lock or padlock system shall be used to lock out the earthing switch in the open or closed

position.

6.8.4 Busbar earthingFor busbar earthing, a truck specially designed for that purpose may be used.The truck shall insert the earthing arms through the racking in shutters near the busbar.The earthing truck shall have full making capacity.It shall be connected to the facilitiesearthing grid via the earth collector designed to normally be incontact with the withdrawable switchgear devices earth collector.Should it be impractical to use a truck, the busbar may be earthed by installing a special-purposefunctional unit in the switchboard.That functional unit should have full making capacity.


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7 Switchgear device

To ensure the equipment efficiency and reliability, it is mandatory for the switchgear devices thatequip the functional units to be manufactured by Schneider Electric.No solutions that include switchgear devices acquired from different suppliers shall be accepted.The cubicles shall be equipped with withdrawal switchgear devices:

A withdrawable circuit breaker,

A withdrawable earthing switch.Racking in and racking out operations shall be carried out with the door closed.The circuit breaker shall be mounted on its racking in / racking out mechanism in such a way as tobe inseparable from it in normal operating conditions.

7.1 Withdrawable Vacuum Circuit Breaker

The circuit breaker shall be designed in accordance with IEC standard 62271-100.It shall be certified by test reports issued by a recognised body affiliated with an international

organisation.The breaking medium is to be vacuum.In all cases, the circuit breaker and its operating mechanism shall have at least the followingverified endurance characteristics:

Number of operations: 10 000.

Number of breaking operations at rated current: 10 000.

The circuit breaker shall be equipped with an electrical operating mechanism with fast openingand closing, independent of the operator, that is operated by a stored energy mechanism.The operating mechanism shall be equipped with:

Push-button for opening and closing,

Mechanical position indicator for the open-closed positions,

Stored energy spring charging handle,

Charged-discharged spring position indicator,

Trip units and auxiliary contacts.The mechanical interlocks between the circuit breaker and the cubicle are summarised in sectionmechanical safety devices.

7.2 Withdrawable earthing switch

The disconnector that equips the disconnection functional units shall be of the withdrawable busriser type.Disconnection shall be carried out by the withdrawal of a movable assembly, with the closing ofearthing metallic shutters on either side of the assembly.


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8 Protection and control system

The term protection and control system designates all the elements included in:

The protection system:

Current and voltage sensors,

Relays, automation devices,

Trip units, associated auxiliaries.

The control system:

Sensors,

Measuring and counting devices,

Monitoring and diagnosis devices,

The communication interface for integration in a remote monitoring and control system.

8.1 Protection and control unit

The functional units shall be equipped with integrated digital protection and control units, whichinclude the protection, automation, measurement, counting, monitoring, and diagnosis andcommunication functions.Additional functions may however be provided by complementary devices.Since the Protection and Control unit is integrated as close as possible to the switchgear, it mustmeet the severest environmental withstand requirements, in particular:IEC standards:

60255-5 impulse withstand 5 kV.

60255-22-1 1Mhz wave Class III.

60255-22-4 fast transients Class IV.

60255-22-3 electromagnetic radiation Class III

60529 degree of protection IP52

60255-21-1,2,3 vibration, earthquake, shock Class II 60068-2-52 salt fogThe operating temperature shall be from -25 to +70 C.The Protection and Control unit range shall be designed to accommodate all types of auxiliarypower supply voltages:24, 48, 127, 220 VDC, and all types of current sensors 1A CT, 5A CT, CSP, and voltage sensors:100, 110 V VT, 100/V3, 110/V3 VT.The manufacturing process shall be ISO 9001 certified.The unit shall be of a disconnectable or withdrawable type to facilitate replacement.

It should be possible to withdraw the current circuit connectors without prior short-circuiting.Each connector shall accommodate 2.5mm

2wiring and 6 mm

2wiring of current circuits.

The output relays shall be capable of withstanding steady state current of 8 A.The logic inputs, which shall have the same voltage rating as the auxiliary power supply, shallcomply with the standards (IEC 60011-32) relative to PLCs and the drawn current shall be at least6 mA (4 mA with 220 V DC).


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8.2 Protection

Each Protection and Control Unit shall contain all the necessary protections; the number and typeof which depend on the application being considered.Each protection device shall have wide setting ranges, in particular for current protections,

providing a choice of curve types (direct time) DT, (IDMT) SIT, VIT, EIT, UIT, and time delays frominstantaneous (50ms) to 300 s, as a minimum.Setting shall be performed by the direct input of primary current values.Detection fault pick-up may reach 100 mA primary.The unit shall allow for the use of upstream and downstream logical discrimination, this applying toprotection plans using IDMT times as well.Protection tripping shall be indicated on the front of the device by a signal lamp and a messageindicating the cause of the fault.

8.3 Measurement

Each Protection and Control unit shall include the measurements needed for operation andcommissioning, i.e. at least the following: Phase current measurement.

Maximum phase current demand.

Measurement of fault current interrupted in each phase.

Additional measurements such as residual current.Measurement accuracy shall be 1% (according to IEC 60255-4).If required by the application, the unit shall include voltage, frequency and energy measurements.For power and energy data, the unit measures real and reactive values and takes intoconsideration the direction of energy flow (incoming, outgoing).

8.4 Operation

The Protection and Control unit shall include an alphanumeric display unit that indicates:

Measurement values.

Operating messages (choice of language to be specified on order, with a choice of at least thefollowing: English or local).

Maintenance messages.

Circuit breaker open or closed position displayed on the front of the device by two signallamps.

It shall be possible to adjust the settings and perform parameter settings via a portable

terminal or a PC.


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8.5 Control and monitoring

The Protection and Control unit shall include the input resources and logic outputs required forcontrol of the breaking devices (circuit breaker or contactor) and for interfacing with the monitoredprocess, comprising at least the following:

Open and close control whatever the type of shunt trip or undervoltage release coil control. Racked in position.

Earthing switch closed position.

Lockout in the presence of a fault.

Monitoring of the circuit breaker operating mechanism and trip circuit (power supply, wiring andcoil).

Detection of connected unit and plugged in connectors.

Operation counter, fault trip counter.

SF6 pressure (for SF6 circuit breakers).

Cumulative total of interrupted kA2.

Storage of information (even during auxiliary power supply outages).

8.6 Communication

The Protection and Control unit may be fitted with a communication interface option of theJBUS/MOD BUS type, RS 485 type, 38400 baud speed, or for the FIP type for connection toSchneider PLCs.The unit shall provide time tagging of events within a ms, with an adapted input available for anexternal clock synchronisation contact.

8.7 Operation dependability

The Protection and Control unit shall include:

An internal function self-monitoring mechanism, which activates at least one (2 desirable) fail-safe watchdog changeover contacts.

An automatic device for switching to the fail-safe position, with disabling of output controlswhen an internal failure is detected.

Indication on the front of the device by signal lamps and messages indicating self-test status.

8.8 Commisionning

The Protection and Control unit shall be delivered ready to use.Only parameter settings specific to the installation will need to be performed on site.However, the unit shall include capacity for customisation and adaptation:

Extension of the number of logic inputs and outputs to at least 20 inputs and 10 outputs.

Modification of the control logic program on request.


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8.9 Maintenance

After a spare hardware base has been set up, the proposed system shall enable restarting withoutany setting or the use of special equipment.The parameter and setting values shall be saved on a movable storage medium, which is part of

the unit.

8.10 References

The purposed Protection and Control unit supplier shall have a large number of internationalreferences with well-known industrialists and utilities.The list of references shall be enclosed with the proposal.

8.11 Service

The supplier agrees to contribute advice, when required, at the time of the protection plan design,and to carry out network co-ordination studies on request (including setting sheets) according tothe best terms possible.The manufacturers personnel shall provide After-sales service; the manufacturer having acompetent organisation and the equipment necessary for making quick diagnoses locally.The list of maintenance service outlets shall be enclosed with the proposal.

8.12 Transparent ready :

With " Transparent Ready ", the switchboard integrates the Web technology.The electric installation is under a permanent surveillance. Transparent ready allows :

To optimize the performance.

To reduce the costs of exploitation.

To improve the reliability of the electric power supplies.

To anticipate the stop of production.

Etc


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9 Current transformers

The current transformers shall be of two types according to the context:

For the protection and measurement functions, wide band non-magnetic sensors CSP typeshall be used.

Conventional current transformers, which comply with the international DIN standards, areacceptable.

For the function of measurement and protection higher than 200A, current transformer typeLV core over MV primary bar may be used.

To facilitate adaptation and maintenance, current transformers specially designed to be added tothe switchgear, and which do not meet international standards, are not acceptable.The current transformers shall have the same short time current and rated voltage withstand asthe switchgear.They shall be epoxy resin moulded and labelled individually.

10 Voltage transformers

The voltage transformers shall comply with international standards.To facilitate adaptation and maintenance, voltage transformers specially designed to be added tothe switchgear, and which do not meet international standards, are not acceptable.The voltage transformers shall have the same rated voltage withstand as the switchgear. Theyshall be epoxy resin moulded and labelled individually.When justified by the operating situation, the voltage transformers may be separated from thepower circuit by isolation.Isolation will be ensured by the use of transformer protection fuses incorporated in thewithdrawable voltage transformer.With this configuration, access to the fuses will only be allowed when the voltage transformers are

withdrawn. This function shall be ensured by mechanical interlock. Key-type lock or latch solutionsare not acceptable.

11 Electrical operating mechanism interface

The withdrawable switchgear device (circuit breaker) may be operated by a mechanism thatincludes the following in the same device:A representation of the position of the switchgear device by an electrical mimic diagram withLEDs.

An opening button.

A closing button.This mechanism should be installed on the front of the low voltage compartment, in the immediateproximity of the protection and control unit.

12 Auxiliary contacts

The switchgear shall be equipped with auxiliary indication contacts connected to terminals in thefactory.The terminal blocks, which receive the available auxiliary contacts, shall be located in the lowvoltage compartment.

The available auxiliary contacts shall be the following: Switchgear.

Earthing switch


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13 LV auxiliary

The protection and control system shall be equipped with:Test units for the injection of current or voltage into the transformer secondary circuits, installed onthe front of the low voltage compartment:

1 unit for voltage, 1 unit for measurement current circuits,

1 unit for protection current circuit,

1unit for unipolar current circuit.

Low voltage protection circuit breakers, located in the low voltage compartment. Fuseprotections are not acceptable.

A local remote selector switch in the case of integration in a remote monitoring and controlsystem.

The low voltage auxiliaries shall comply with the standard IEC 62271-200 IEC 60694, article 5,section 5.4.

The auxiliary supply voltage shall be from 48VAC to 240 VAC 50 / 60Hz and from 24 VDC to 220

VDC, with a permissible variation range of -15% to +10%.The low voltage cables shall be of the self-extinguishing, 750 V insulation class type.Both ends shall be identified to facilitate checking during maintenance operations.For the current circuits, the cable cross-section shall be 2.5 mm

2and 1 mm

2for the other circuits.


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14 Use

In order to make the switchgear simple and safe to use, the following construction requirementsmust be met.

14.1 Operating mechanism

All operating mechanisms and access points shall be on the front of the functional units.In particular, cable and busbar connections must be possible via the front.Racking out and racking in of the circuit breaker or contactor shall be carried out with the doorclosed.The door shall include inspection ports for unequivocal viewing of the circuit breaker position(racked in or racked out).In no case must the breaking device contacts be visible.The different operations shall be validated once they have been completed by a special-purpose

selector switch that may be locked out by key-type lock or padlock.

14.2 Operating guide

The operating procedures for the current operations must be described on the front of eachfunctional unit:

Opening/closing of the switchgear device.

Racking in/racking out of the switchgear device.

Opening/closing of the earthing switch.

Plugging in/unplugging of the voltage transformer protection fuses.This shall be described exclusively in the form of explicit symbols and colour codes.Instruction guides, which use only text, are not acceptable.

14.3 Mechanical safety devices

The functional units shall have a large number of fail-safe mechanical devices so as to make theuse of the switchgear safe:

Impossible to ground cables unless the switchgear device is racked out,

Impossible to rack in or rack out switchgear device when the earthing switch is closed. Impossible to rack out a closed switchgear device.

Impossible to open the switchgear compartment door unless the device is racked out.

Impossible to gain access to the compartment, which contains the cables when, the earthingswitch is open.

Impossible to gain access to the voltage transformers and their protection fuses unless theVTs have been withdrawn.

Impossible to extract a switchgear device from a cubicle unless the extraction truck is solidlylocked to the cubicle.

Locking of the switchgear device to the truck when it is disconnected from the cubicle.

None of these safety measures may be ensured by the use of a key-lock or padlock.


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14.4 Lockout facilities

The switchgear shall have at least the following lock-in and lock-out by key-lock or padlockfacilities.

14.5 Documents and training

See section on commercial terms .


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15 Installation / Commissioning

Qualified personnel shall install the switchgear.The switchgear supplier shall be capable of providing all the services necessary, from training ofpersonnel to installation and full commissioning on site if required.

15.1 Transport

Each functional unit shall be set on and screwed onto a wooden floor.The units shall be individually protected against rain and dust by polyethylene wrapping, in whichdesiccant bags are placed.Wooden straps shall be used to protect against impact.According to the destination, 2 types of packing are proposed: Marine or land.

15.2 Handling and storage

The wooden floor onto which each functional unit is screwed should allow for handling by a forklift.In order to allow hoist handling, each functional unit shall be equipped with four lifting lugs boltedto the upper part of the frame.The lifting lugs should be easy to remove.The switchgear should be capable of being stored for as long as necessary in the followingconditions:

Closed, normally ventilated warehouse, which shelter the equipment from all spraying orsplashing water, wind, sand and all direct chemical pollution.

Humidity in compliance with that defined for normal operating conditions.

15.3 Installation

The switchgear shall be located in premises reserved for electrical facilities.It shall be set up on steel structures, above a utility space, which allows for the running of cables.The maximum clearance to be provided around the switchboard shall be:

Lateral: 500 mm.

Behind the switchboard : 600mm

In front of the switchboard: 1800mm, to facilitate any subsequent extraction of functional units.

Above the switchboard : 1300 mm (for internal arc performance)The equipment, on a forklift, should be able to pass through a door 2500 mm high and 1000 mmwide.

15.4 Cable connection

Cable inlets should be provided at the bottom or the top of each functional unit.The bottom plates shall be pre-drilled, and all the holes blocked off by cut-out type plastic cones.The cables shall be connected via the front or rear.The cable ends shall be bolted to connection terminals.The cables shall be flanged to cubicles by plastic collars.When the cables are connected, a non-magnetic panel shall close off the floor of each functionalunit.


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15.5 Busbar connections

Busbar connections shall be made via the top or rear of each functional unit.The bars shall be bolted to each other and to the ends of the connections with screws fastened tothe connections, torqued in accordance with the Installation Manual

15.6 Earth collector connection

The switchboards main collector shall be bolted onto the collector of each functional unit.

15.7 Low voltage circuit connections

The low voltage circuits of each functional unit shall be factory-wired.Only the LV and inter-cubicle cables and connections arriving from outside the switchboard shouldbe wired on site.The outside cable inlets may be on the bottom or top of each functional unit or at either end of the

switchboard.The LV cable ends shall be connected to terminal blocks located in the low voltage compartment.The supplier shall supply the inter-cubicle wiring.The wiring shall be identified by codes, which comply, with indications given in the wiringdiagrams, which the supplier agrees to include with the switchgear.In order to facilitate inspection and servicing operations, connection of the protection and controlunit carried out in the factory by the suppliers, shall be the plug-in type.

15.8 Commissioning

Commissioning of a functional unit should be simple and quick.

The switchgear supplier shall make all the documents necessary for the operation available.

15.8.1 SettingThe only settings required during the commissioning of a functional unit shall be parametersettings of the protections and the alarms on the protection and control unit.The settings shall be made by means of a communication interface in French or English, which ismade easy to use by the application of a pull-down-menu communication mode.No programming should be carried out on site.

15.8.2 Testing

In order to reduce commissioning time, the equipment proposed shall be designed so that thecommissioning of each functional unit does not require individual testing of each protection andmeasurement function.Testing shall be limited to:

Checking of the parameter settings by direct reading.

Checking of the connections to the current and voltage sensors by secondary injection usingCT and VT test blocks or terminals.

Measurement of residual current and voltage for configurations which use those values.

Checking of logical input/output wiring.

Switchgear device operation by push-button.

Pilot wire connection test.


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16 Servicing and maintenance

The switchgear must be of the low maintenance type. No access to the breaking contacts will beaccepted.In no case shall the switchgear require scheduled servicing at less than yearly intervals.Operations, which call for dismantling of the cubicles for access to the inside of the compartments,

shall be carried out at intervals of at least ten years.

16.1 Cubicle servicing

The cubicles shall require no maintenance in normal operating conditions.The only servicing that may be envisioned is visual inspection of the insulating materials, platesand earthing switch contacts, as well as dusting.This operation shall not take place at intervals of less than ten years.

16.2 Switchgear servicing

Since the breaking devices are all of the pressure-sealed type, no servicing of the contacts shallbe necessary.The switchgear operating mechanisms shall be tested once a year to check that they operatecorrectly (opening/closing).In addition, a degreasing/greasing operation shall be carried out every 10 000 operations or everyten years, at most.

16.3 Protection and control system servicing

Due to its digital technology, the protection and control system should be sufficiently reliable so asnot to require scheduled servicing.

16.4 Conditional servicing

The functional units shall be equipped with at least the following conditional maintenancecapabilities:

Operation counter.

Recording of the sum of interrupted currents.

Tripping circuit monitoring.

Protection and control unit self-monitoring.Remote transmission of this data should be possible via a remote monitoring and control system.


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17 Commercial terms

The selected supplier shall give proof of a least 30 years of experience in the Medium Voltageequipment field concerned (normal service life of medium voltage equipment).The supplier shall also give proof of at least five years of experience in the field of digitalprotection.

It is imperative for the supplier to give proof of local, ISO 9000-certified industrial facilities.No solutions consisting of imported finished functional units shall be accepted, the same applyingto all manufactured products that have not been granted the official ISO 9000 label by a certifiedorganisation.All the equipment shall be available ex-works from the manufacturing plant within a lead-time oftwelve weeks as of the sending of the final order, including all the information required formanufacturing.Any modification of the technical content, which is made after the date in which the order isplaced, will require an additional clause with the date of supply negotiated with the supplier.

17.1 Offer

The deadline for the establishment of an offer based on the preceding information is two weeks.The offer shall comprise a quotation including:

The technical proposal, global and functional unit, to meet these specifications.

Proposed variances with respect to these specifications.

The overall price of supply.

The commercial and legal terms of the offer.

This document shall be accompanied by at least the following:

Technical documents presenting the equipment.

Single-line diagrams of all the switchboards.

Low voltage functional diagrams.

Dimensional and layout drawings, with mounting and cable running.

An accurate representation of the front view of the equipment.

The list of test certificates related to the requested performances.

The services associated with equipment supply, included in the overall price.

Any options, with prices and impact on equipment availability time.

Operating and servicing documents.

The list of spare parts with prices, indicating the average delivery lead times.

Warranty terms.Before an order is placed, the supplier will be requested to supply the complete wiring diagrams,as well as the civil engineering and installation documents.

17.2 Manufacturing and delivery

The equipment may be inspected during manufacturing in any of the plants, which are involved inthe related manufacturing. However, no acceptance testing operations will be required in the plantat the end of manufacturing.The equipment shall be delivered with all documents required for installation, commissioning,operation and servicing-maintenance.The supplier agrees to provide the training required for the normal performance of thoseoperations in accordance with the terms specified in the offer.


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Ais 175 Vacuum Circuit Breaker

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