TAVRIDA ELECTRIC VCB Series, Руководство пользователя, Страница: 92 / 142

92
Operation description Required tool Approximate timing
Primary circuits insulation check
1)
Observe safety precautions listed in the danger
and warning advisories. Construct proper barriers
and warning light systems
Equipment to provide safety in the test
area
10 minutes
Ground each pole of ISM that is not under
test
2)
Wires 2 minutes
Apply slowly rising 100%
3)
of test voltage
4)
(50 or
60 Hz) across each pole for one minute
5)
. (ISM is
open)
Power frequency withstand voltage test
set
2 minutes
If the pole sustains the test voltage for that period,
its vacuum integrity has been verifed
6)
Power frequency withstand voltage test
set
-
Repeat actions above to check each pole of ISM Power frequency withstand voltage test
set, wires
8 minutes
Close the ISM. Ground each pole of ISM that is
not under test
2)
Wires 1 minute
Apply slowly rising 100%
3)
of test voltage
3)
(50 or
60 Hz) between a primary conductor of the pole
and ground for one minute, repeat test for each
pole of ISM Power frequency withstand voltage test
set
12 minutes
If no disruptive discharge occurs, the insulation
system is satisfactory Power frequency withstand voltage test
set
-
After the test, ground all main circuit terminals to
dissipate any static charge
Wires 2 minutes
Auxiliary circuits insulation check
Connect all points of the secondary circuits with a
shorting wire. ISM coil connection wires must be
disconnected from connector X3 of CM before the
test
Wires 5 minutes
Connect the shorting wire to the high potential
lead of the high voltage tester and ground the
circuit breaker housing. Starting with zero volts,
gradually increase the test voltage to 1500 V
RMS, 50 or 60 Hz. Maintain test voltage for one
minute
Power frequency withstand voltage test
set
3 minutes
If no disruptive discharge occurs, the secondary
circuits insulation level is satisfactory Power frequency withstand voltage test
set
-
Disconnect the shorting wire and re-attach the
wires to connector X3 of CM
Visual check, no tool is required 5 minutes
1) This test includes not only the vacuum interrupter test, but also the other insulation components tested in parallel with the interrupter. These include
the standoff insulators and the insulated drive links, as well as the insulating (tension) struts between the upper and lower vacuum interrupter
supports. If these insulation components are contaminated or defective, the test voltage will not be sustained. If so, clean or replace the affected
components, and retest.
2) Three phase ISM should be tested phase by phase only. Therefore poles not under the test should be grounded.
3) For test of separate VCB - 100% level of test voltage, for test of Switchgear with installed VCB - 80% level of test voltage according to
IEC 62271-200.
4) Rated test voltage levels (Ud) are given in Table 1.
5) To apply test voltage single-core short cables should be used. Application of high voltage coaxial cables is strictly prohibited. To coordinate the
surge impedance between the test set and ISM extra resistor as shown in the Figure 154 shall be used.
6) During testing of vacuum interrupter, self-fading restrikes may appear. In case of restrikes, reduce the voltage slightly until the restrikes disappear
(for 10-15 seconds) and then increase again.