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UB TATIONTesting of control & protection cables to ensure
their healthiness
1. insulation resistance (Megger test)1.
ore!"roun#$Shiel#$Ar%our. ore!ore
. 'erification of core(s) continuit. 'erification of shiel# an#
Ar%our continuit an# groun#ing
*' Bus+or,$-uip%ent onnections1. 'erification of tightness of
nuts$bolts as per the reco%%en#e#
torue. 'erification of sag an# tension of the o/erhea#
con#uctors. Measure%ent of contact resistance of the *'
connections0. Ther%o /ision sur/e of the *' connections after
energiation at
high /oltage2. hec, of /isible corona after energiation.
T3AN 4O3M-3a) Oil insulation testb) 5in#ings insulation
resistance testsc) Insulation po+er factor test#) 6o+ /oltage ratio
test on each position of the tap changer.e) 7ero seuence i%pe#ance
testf) 4unctional test for au8iliar euip%ent9 buchhol rela9
ther%al
rela9 oil le/el in#icator etcg) A#:ust%ent of the protecti/e
#e/ices such as gas an# oil
te%perature relas an# sste% to sho+ co%pliance +ith
operatingreuire%ents9 correct operation /erification of
oil!preser/ationan# oil!protection sste%.
h) 'ector group test.
i) Operational test for auto%atic tap!changing euip%ent9
a#:ust%entof the protecti/e #e/ices such as gas an# oil te%perature
relasan# sste% to sho+ co%pliance +ith operating
reuire%ents9correct operation of co%plete cooling sste% an#
/erification ofcorrect operation of oil!preser/ation an#
oil!protection sste%.
:) Measure%ent of capacitance an# #issipation factor (tan ;),)
hec,ing the oil lea,sl) Measure%ent of +in#ing resistances%)
'erification of all alar%9 trips an# control circuitn) Open circuit
testo) Short circuit test
I3UIT B3-AO>9 >>9 >O> an#
>OO>operations
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5hile perfor%ing the ti%ing tests9 in a##ition to the
nu%ericalprintout9 traces of contact tra/el an# close$open
positions i.e.graphical recor#ing of ti%es shoul# be appen#e# to
the test reports.
#) S4= lea,age tests.e) Measure%ent of contact resistance.
?I ONN-TO3 $-A3T*IN" 5IT*-a) Measure%ent of contact resistance
of the %ain contacts.b) 'erification of li%it s+itch operation.c)
Measure%ent of operating ti%es for opening an# closing operations#)
'erification of functioning of %otor protection #e/ices b
secon#ar in:ection.e) 4unctional tests in respect of
local$re%ote controls9
interloc,ing9 annunciations
U3"- A33- T-3a) Test of insulation resistance@
*'!"roun#$BaseBase!"roun#
b) Measure%ent of lea,age current +ith lea,age current
analer
subseuent to energiation of arresterc) hec, of /isible corona
after energiation
U33-NT T3AN 4O3M-3 $BU *IN" U33-NT T3AN 4O3M-3a) Measure%ent of
+in#ing resistance at each tap of each secon#ar
+in#ingb) Measure%ent of capacitance an# #issipation factor
c) 'erification of +in#ing polarities b flic, test#)
'erification of %agnetiation characteristics an#
,nee!point/oltages
e) 'erification of ratios.f) 'erification of current
circuits
OU6IN" AAITO3 'O6TA"- T3AN 4O3M-3 ('T )$AAITO3'O6TA"- 9 T3AN
4O3M-3 9 ('T )$'O6TA"- T3AN 4O3M-3a) Tests of insulation resistance
(Megger tests) @
- ri%ar +in#ing!groun#
- ri%ar to each secon#ar +in#ing
- Secon#ar to groun# an# bet+een secon#ar +in#ings
b) Measure%ent of +in#ing resistance at each tapc) 'erification
of polarities
- In case polarit of 'T$'Ts$'Ts +in#ings cannot be
/erifie# +ith the flic, test9 phase angle %eter shall beuse# to
chec, the phase angle bet+een the pri%arin:ecte# /oltage an#
secon#ar output.
#) 'erification of /oltage ratio at each tap b pri%ar
in:ection.
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e) apacitance an# #issipation factor %easure%ents.f)
'erification of /oltage circuits@
M-A U3-M-NT O4 -A3T*IN" 3- I TAN-
Measure%ent of groun#ing resistance +ith earth resistance
tester! -ach neutral connection of transfor%er
! -ach surge arrester connections anels an# euip%ent insi#e the
buil#ings
Measure%ent of groun#ing resistance b in:ecting A current
After co%pleting the in#i/i#ual tests of all euip%ents +e chec,
thecontrol Sche%es
1. Out#oor Marshalling
