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VM1/A/P
- INSTALLATION AND SERVICE INSTRUCTIONS ANSI: ... 15 KV; ... 2000 A; ... 31.5 K A
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6. Description
6.8. Control scheme
VM1/A/P circuit breakers are similar in switching
con-trol to standard spring stored energy
mechanisms as indicated by the Sequence of
Operation in Chart 1.
Notes for Chart 1: Once the capacitor(s) is(are)
charged (<10amps), the control power will
experience a constant drain of approximately 2mA
in lieu of a typical motor circuit of a spring stored
energy mechanism requiring impulse currents up to
20amps.
Chart 1: Sequence of operation
(not to scale)
Available to charge
Control Power
Capacitor Stored
Energy
Connect Spring
Closing Coil
Closing time
Opening time
Open Coil
Circuit Breaker
Capacitors fully charged
Closing signal allowed
Start of closing operation
Closing operation complete
Small voltage drop across capacitor
Start of opening operation
Constant
2 mA
60 V
< 80 V
Open operation complete
Compression springs charged
Compression springs discharged
ON
OFF
Charged
Discharged
Charged
Discharged
ON
OFF
ON
OFF
ON
OFF
The capacitor voltage will vary 5 to 10Vdc during
switching operations allowing for fast recharge and
reclose schemes. The opening and closing coils are
operated via the storage capacitor(s) and thus only
require a minimal signal (24V min) to operate. The
nominal circuit breaker closing and opening times
are typical at 55ms and 65ms respectively.
Note: Sample drawing for actual draft manual.
Summary of Contents for VM1/A/P
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Page 51: ...MEDIUM VOLTAGE PRODUCTS 51 51 ...
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