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Power QualityTraining Courses

LPQIVES is co-financed by:

LPQIVES is a programme of:

LPQI is part of:

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Overvoltages and Transients

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Module 4

Overvoltages and Transients

1 INTRODUCTIONThe aim of this module is to provide the user a detailed overview of the overvoltages and transientsrelated problems, by supplying a guidance for insulation coordination and design, for the selectionof the electric strength of equipments, of surge arresters or portective spark gaps, and forstructures protection installations.

1.1 General aimsThis modules general aim is to provide the attendants the basic knowledge about overvoltagesand transients related issues, and some tools for the choice and design of the protecting measures

for devices and structures.The aim is achieved through 8 didactic sections, as follows: Section 1: Overvoltages and transients ; Section 2: Insulation coordination, definitions, principles and rules; Section 3: Standard withstand voltage tests; Section 4: Protective devices; Section 5: LV, MV and HV surge arresters; Section 6: Risk assessment for the choice of protecting measures against the effects of

lightning Section 7: Protection of structures against lightning Section 8: Maintenance and inspection of LPS

1.2 Target groupsThis modules target group includes: designers, experts, installers, others, users, utility, and allthose who wish to expand their knowledge in Overvoltages and transients issues.

2 SPECIFIC AIMS AND TOPICSThe pathway of learning consists of a 2 days course, subdivided in sections (with differentduration), with these contents and related aims.

1st dayContents Introduction to overvoltages and transients, concept of insulation coordination,

withstand voltage tests and protective devices.

Aims The aim of the first day lessons is to introduce the basic knowledge related toovervoltages and transients (definitions, origin, standards, related problems), andthe key concept of insulation coordination and protection.

2nd dayContents Risk assessment for the choice of protecting measures, protection of structures

against lightning (design of protective installations (LPS)), maintenance andinspections of LPS.

Aims The second day lessons aim is to provide the attendants some practicalinformations and tools on the risk assessment and the choice of protectingmeasures. The last section of the course will be dedicated to the key problem ofinstallations inspection and maintenance.

Below theres a detailed overview of the course contents.

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2.1 Pathway of learning flow chart

Time progression(hours) Section

1

Knowledgelevel

Existing knowledgerequirements

Overvoltagesand transients

basics

Insulationcoordination

aspects

Withstand voltagetests basics

1

2

3

End of thecourse

5

Protective devicescharacteristics

6 , 5

9

Protection choicetools

Structures protectiondesign aspects

2

3

5

6

8

Lesson

Lesson and discussion

Lesson and practical training

1 0

3 COURSE DETAILED PROGRAMGeneral notes: each day there will be one coffee break (30 mins) which will divide the lesson in two parts no

longer than 2,5 hours; at the beginning of the course the lecturer will explain course aims and at the end he will verify

their fulfilment through a knowledge test; the course will be divided in theoretical and practical sections; at the end of the lessons, a user satisfaction survey will help the lecturer in monitoring the course

quality.

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30 mins Coffe break

60 mins Section 8: Maintenance and inspection of LPS Scope of inspections, order of inspections, maintenanceModality: Lesson and practical training

60 mins Final discussion; end of the course; users questionnaire; knowledge test;Confirmations of attendance

4 TEACHING METHODSTeaching methods are summarized in three main moments: knowledge transfer (Lesson)

topics exposure by the lecturer with the help of slides and eventually other electronic tools(animations, data sheets, didactic movies);

deepening/learning verification (Discussion)

general discussion stimulated by the lecturer (also during the lesson) to verify knowledgetransfer and to eventually deepen particular topics; practical training (and eventually laboratory activities)

group work (~ 6 persons/group) for topics deepening, practical problems solution and casestudies overview under the supervision of the lecturer.

During all the sections, the lecturer will always attend, with teaching and/or activity coordinationduty.

5 DIDACTIC MATERIAL AND TOOLSThe didactic tools which will be used by the lecturers will be: Blackboard Video-projector Notebook Microphone

The lecture room will be suitable to allow the use of all the above listed didactic tools and to enablegroup work for the addendants.

Each user will receive, during the registration, a folder containing: course program; lecture notes containing all or part of the lecture slides.

Some additional electronic tools will be available also in electronic format at: http://www.leonardo-energy.org/drupal/ .

The folder will also include a user satisfaction questionnaire and a knowledge test (which will beboth filled and submitted at the end of the course).

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6 EXISTING KNOWLEDGE REQUIREMENTSThe users existing knowledge should include:

Topic LevelBasic Medium HighMathematical analysis Statistic Electrical circuits Power systems Power quality

7 ACQUIRED COURSE KNOWLEDGE REQUIREMENTSAt the end of this course the user will have learned the basic aspects related to overvoltages andtransients (definitions, origin, standards, related problems), and the key concept of insulationcoordination and protection along with some practical informations and tools on the riskassessment and the choice of protecting measures.