L488 Register

Code: 15EE63B

Number

I Semester Diploma Examination, April/May-2013

TESTING, MAINTENANCE & CONTROL OF

SUBSTATION

Marks : 100
Time: 3 Hours | I Max.

camies s markS.
Nofe? 0) Answer any six questions from Part A. Each question 10
carries
B. Each full question
any seven full questions from Part
Answer
marks.

PART-
I.Define substation. List the different types of substation.

Draw the diagram of ring bus bar and explain.

5. Draw and explain the layout of simple short crcuit testing station.

Circuit Breaker.
4. Explain maintenance of Airblast

5. List the various classes of test on relay.

injection lest
set of testing
of prolective relay.
6. Explain primary current

transformer.
7. List the various preliminary tests on

List the vanous type lest on PIs.

8.

9 List the basic variables related with substation monitoring.

PART- B

(a) Explain duplicate bus bar arrangement.

10.
(b) Explain transformer waler spray sysiem.

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ISEE6JB 2of2 1488

.(a) Explain temperature rise test on bus bar

(b) State the difference between fiexible bus and rigid bus bar system.

2 (a) Define
isolator. List the types of isolator
(6) Explain Milivolt drop test on Circuit Breaker

1S. () Explain short line fault test on Circuit Breaker.

(o) Explain capacitivC CurTent switching test on circuit breaker.

4 (a) Explain Brower Boveri's synihetie testing circuit for testing of circuit breaker.

(6) Explain testing circuit lor differential relay.

15. (a) Explain testing cireuit for Buchholz relay.

(6) Explain hasic principle of static directional over current relay.

16. (a) Draw the block diagram of digital relay.

(b) Explain lightening impulse test circuit for transformer.

17. (a) Explain switching impulse test circuit for transformer.

(b) Explain core insulation test and ratio
polanty test on
transtormer.

T8. (a) Explain over

vottage inter tum test on CTs.

(b) Explain tums ratio test on CTs and

PTs.

19. (a) Explain typical test cireuit

arrangement for
partial discharge test on transformer. 5
(b) Explain on line
micro-processor bascd fault monitory and
fault locators.
1416 Register
Code: 15EE63B

Number

VI Semester Diploma Exumination, Oct/Nov.-2019

TESTING, MAINTENANCE AND CONTROL ODF
SUBSTATION

Time:3 Hours| | Max. Marks: 100

carries marks.
Nole () Answer any si questions from PART - A. Each question
Each caries
(11) seven full questions from PART
-
B. question
any
Answer
10 marks.

PART-A

. D r a w single line diagram of a general substation and label the componenis.

List the difterent types of substations.

3. Define bus bar. List the types of bus bars.

maintenance ofa circuit brcaker.

4List the steps in general
S. Explain acceptance tests on relays.

6. Explain error mcasurement tests on CT with a neat circuit diagram. 2+3

be taken while using CTs.
Explain the precautions to

Explain the procedure for maintenance of transformer oil.

List the various tests on s .

9

PART- B

10. (a) Draw duplicate bus bur arrangement and explain. 3*

(b) Explain the funetion of carth screen in a substation.

11. (a) Define isolator. List the types of isolators. 2+2

List the tests

(b) on
isolators.
I of2 TTurn over
 1416
2 of2
15EE6JB
test on circunt orcake.
3+3
nse
millivolt drop test and temperature
(a) Explain
circuit breakers.
methods on
(0) List the indirect testing

station and explain.

5+5
short circuit testing
3. Draw the layout of a simple
5+5
circuit and explain..
14. Draw Brown Boveri's synthetic testing

and explain.
33
for Buchttolz relay
15. (a) Draw the testing circuit

of tests an relays.
(6) List the four classes

3+4
injectuon test set with a neat circuit diagram.
current
1. (a) Explain primary

(b) Explain repair lests on relays.

3+3
diagrams.
polarity test on CT with circurt
17. (a) Explain ratio test and
leatures ol sub systems.
( b ) i s t the desirable

5*5
monitoring With a neat block diagram.
oninc microprOcessor
based fault
18. Explain

maintenance ol
and annual checks
carried out lor power
19. (a) List daily, monthly

translormer transtormers.
(b) EXplain routine tests on
 Code 15EE63B

1318 egu
her

Nov./Dec.-2018
Examination,
VI Semester Diplomn
OF
TESTING, MAINTENANCE & CONTROL
SUBSTATION

I Max. Marks: 100

Time: 3 Hours|
caries > marks.
A. Each question
Nofe 0) Answer any six questions from P'art
carrics T0 marks.
from Part -B. Each question
(1) Answer any seven questions

PART- A

List the essental Ieatures of substation.

1.

List the types o1 bushars.

2. Define busbars.

resistance test circuit breaker.

Explain D.C.
on
3.

4. s t the methods of indirect testing ot cireuit breakeTs.

List the steps involved in m a i n t e n a n c e

of relays.

6 Explain the hasic principle ol directional over

current
relay.

7. List the four p r e l i m i n a r y tests n iranstoFTIer. EXplan alio, polarity test

8. List the vanous typest tests un'Ts anet CAplan c t r measuremcnt test on PT.

9 List the basie variubles related with substialiom henioring. List two categornes of
primary contrl in subst.ation ant menln the cuapments usead in automatic control

of substation
Turn over
 1318
ISEE6JB

PART-B
duplicate busbar arrangemenes a
atso

Eplain with diagrams single and

a mention relative advantages anu a s a v a i n g e s

electrical substations.
h Mention diftercnt types o

breakers
(a) Explain temperature rise test on circuit

(b) List routine tests on circuit breakeET.

tw
of Isolaters and list the interlock anrangetment
ta) Deine 1so1ater. LIst the types
prevcnr mal-operatiotm ot Iolate.

small nductive current breakers test on circuit breaker.

h Explaun

13 ta) Explain with block diagram basie principle of static over current relay.

b) List the four classes of tests on relays.

14. (a) Explain with block diagram a digital relay. Also, explan the two families o
gital elays.
b) List the three final tests on transformers,

15. (a) Explain excitng current tcst. polarity test and insulation test on transtormers.
(b) List daily checks, monthly and annual checks to be carried out for the
maintenance ot transtormer.

T6. a) Explain onlne micruprocessor based fault monitornng of substation.

(b)List the two subsystems of a substation. Explain the desirable features of the

Subsystcrns.

T7. Ta Explain primary cuTent injection test set and sccondary cuTeit injection test

b) State the necessity of substation.

18. (a) the

Eapiain 1ayout ot Simple short cireuit Iesung
(b}
stathon.
Explain the rules for type tests of a circuit breakers.

19. (a) Define partial discharge Explan the typical test circuit arrangemet 1or partial
discharge of transtorme
(b) Brietly explain maintenance of vacuum circuit
breakers.
1664 Register
Code: 15EE63B

Number

VI Semester Diploma Examination, AprilNiay-2019

TESTING, MAINTENANCE & CONTROL OF
SUBSTATION
Time:3 Hours| I Mas. Marks: 100

Instruction: () Answer any sis questions from PART- A. Answer to each question carries
5 marks.
(11) Answer any seven questions from PART AnsweT to cach
carmes 10 marks.
-B. question

PART A
.Explain the function of carthing screen in a substation.

2. (a) What is the function of Isolator ?

(6) List the interlock arrangement to prevent mal-operation of the isolator.

3. Explain mechanical test circuit

on
breaker 5

4. Explain the maintenance of minimum oil circuit

breaker
S. Explain acceptance tests and installation tests on
relays.

6. List the steps involved in the maintenance of relays.

7. Explain error measurement test on curTent transformers.

8.
Explain the ypical test circuit arangement for partial diScharge n
transformer. power

9. Explain the functions of unit level in a substation.

1 of2
ITur OvEr
 2 of2
1SEEASB
PART-B
in a substathon
10. (a) Explain fire fighting systern
of substation
in automatic contnol
6) Eplan the equipment used

1. Explain with ncat skciches

(0) Singlc bus bar arrangcncnt
() Duplicate bus har arrangemcnt

12 Explain

c n p e r a t u r e rise test on bus bar

(t) Short time cuTent test orn bus her.

13. Explain with a neat sketch parallel current injection method of testing circuit breaker. 100

14
Explain the
folowing tests on circuit
) Line
brcak ers
charging breaking current iest
(ü) Out of phase switching test

15. Explain with neat sketches :

)Primary current injection test on relays
() Sccondary current injection test on relays
16. Explain the test circuit uscd tor
) Differential relays
(i) Buchholz relay

17.
Explain the
following routine tests on circuit becakers:
0 DC. resistance tes

(i) Dielcctric tests

18. Explain lighting impulsc ies circut 1or

poweT transjormcrs with a neat
sketch. 10

19. Explain with a neat skctch ultrasonc method ot locatios of

dransformers partial discharge in