Powell 05PV36ARMM-4, Instruction Bulletin

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01.4IB.60306
2) Timing
At normal control voltage, operate the
test source to the “close” position to close
the circuit breaker and record the closing
time. The closing time from energizing the
closing coil to vacuum interrupter contact
touch should not exceed the values in
the timing table. Again, at normal control
voltage, operate the test source to the
“open” position to open the circuit breaker
and record the opening time. The opening
time from energizing the shunt trip coil to
vacuum interrupter contact part should not
exceed the values in Table C, Timing .
Table C Timing
Closing Time Tripping Time
3 Cycle ≤80 ms <35 ms
5 Cycle ≤80 ms <55 ms
3) Primary Resistance Check
This check is not required for routine
maintenance but it is recommended after
any major maintenance that requires
disassembly of any part of the primary
current path.
To check the resistance, pass a minimum of
100A DC through the circuit breaker pole,
with the circuit breaker closed. Measure
the voltage drop across the primary
contacts and calculate the resistance. The
resistance should not exceed the values
provided in this instruction bulletin for
the specific type and rating of the circuit
breaker being measured.
When making this test, be sure that the
test current passes through both main
horizontal primary disconnecting devices
of each pair, or the resistance measurement
will be affected. This may be done by
connecting the current source leads to two
blocks of full round edge copper 1” thick
by 3” or 4” wide by 4” long, and pressing
these blocks into the upper and lower
primary disconnecting devices of the circuit
breaker compartment. The voltage drop
measurement may be made between these
two blocks.
The micro-ohm values of resistance must
not exceed the following limits:
Table D Primary Resistance
Breaker
Type
Rated
(kV)
Rated
Continuous
Current (A)
Resistance
Micro-Ohms
05PV36ARM 4.76 1200 60
05PV36ARM 4.76 2000 50
05PV36ARM 4.76 3000 40
05PV50ARM 4.76 1200 60
05PV50ARM 4.76 2000 45
05PV50ARM 4.76 3000 40
05PV63ARM 4.76 1200 60
05PV63ARM 4.76 2000 40
05PV63ARM 4.76 3000 40
15PV25ARM 15 1200 70
15PV25ARM 15 2000 50
15PV25ARM 15 3000 40
15PV36ARM 15 1200 60
15PV36ARM 15 2000 50
15PV36ARM 15 3000 40
15PV50ARM 15 1200 60
15PV50ARM 15 2000 45
15PV50ARM 15 3000 40
15PV63ARM 15 1200 60
15PV63ARM 15 2000 40
15PV63ARM 15 3000 40
15PV63ARG 15 1200 60
15PV63ARG 15 2000 40
15PV63ARG 15 3000 40