ELECTRICAL SUPPLY AND DISTRIBUTION SYSTEMS

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MODULE TITLE : ELECTRICAL SUPPLY AND DISTRIBUTION SYSTEMS

TOPIC TITLE : FAULTS ON THE SUPPLY SYTEM AND PROTECTION SYSTEMS

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ESD - 4 - TMA (v1)

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Published by Teesside University Open Learning (Engineering)

School of Science & Engineering

Teesside University

Tees Valley, UK

TS1 3BA

+44 (0)1642 342740

retrieval system, or transmitted, in any form or by any means, electronic, mechanical,

photocopying, recording or otherwise without the prior permission

of the Copyright owner.

This book is sold subject to the condition that it shall not, by way of trade or

otherwise, be lent, re-sold, hired out or otherwise circulated without the publisher's

prior consent in any form of binding or cover other than that in which it is

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IMPORTANT

Before you start please read the following instructions carefully.

1. This assignment forms part of the formal assessment for this module. If

you fail to reach the required standard for the assignment then you will be

allowed to resubmit but a resubmission will only be eligible for a Pass

grade, not a Merit or Distinction.

You should therefore not submit the assignment until you are reasonably

sure that you have completed it successfully. Seek your tutor's advice if

unsure.

2. Ensure that you indicate the number of the question you are answering.

3. Make a copy of your answers before submitting the assignment.

4. Complete all details on the front page of this TMA and return it with

the completed assignment including supporting calculations where

appropriate. The preferred submission is via your TUOL(E) Blackboard

account:

https://eat.tees.ac.uk

5. Your tutor’s comments on the assignment will be posted on Blackboard.

Teesside University Open Learning (Engineering)

1. FIGURE 1 shows four generators feeding into a sectionalised busbar with

a fault limiting reactor.

FIG. 1

Each generator is rated at 11 kV and 30 MVA and has a reactance of

0.2 p.u.

Calculate the value of the reactance to limit the fault level on a feeder to

500 MVA.

2. FIGURE 2 shows the sectionalised busbar of a two generator power

station connected to the national grid.

Calculate, using a 40 MVA base, the fault level for a 3-phase symmetrical

short circuit on the 11 kV feeder.

R Y B Fault

Loads

A C D

Teesside University Open Learning (Engineering)

FIG. 2

3. State:

(i) The function of a plug bridge on an IDMT electromagnetic

protection relay.

(ii) Two ways in which the setting of an IDMT electromagnetic relay

may be altered.

R Y B Fault

2 × 40 MVA 0.14 p.u.

0.31 p.u. on 40 MVA

11 kV

Grid-in-feed 1500 MVA

132 kV

2 × 15 MVA 0.12 p.u.

Teesside University Open Learning (Engineering)

4. (a) An 11 kV, single phase system is protected by a scheme using 1000/5

CTs and an IDMT relay having a plug setting of 150% and time

multiplier setting of 0.68 (FIGURE 3).

Using the standard PSM/time characteristic, find the relay operating

time (TMS = 1) for a 236 MVA fault.

FIG. 3

(b) The circuit breakers CB1, CB2, CB3 and CB4 are part of a scheme

which uses 1000/5 CTs and IDMT relays.

If the maximum fault current capability is 6700 amps, clearance of

which must be initiated in 2.25 secs, select, using the standard

characteristic:

(i) plug setting multipliers for CB1 at plug settings of 100% and

50%

(ii) the time multiplier setting of each IDMT relay to afford

effective discrimination of 0.4 sec at a plug setting of 50%.

Fault

CB1

Load A

CB2 CB3

Load B

Load C

CB4

Teesside University Open Learning (Engineering)

Question No.

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