GE Industrial Solutions PowerVac 5kV VL PV VL 4.16-250-0 - Manual (Page 18)

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5-1 Description
The PowerVac ® 5kV VL vacuum circuit breaker
uses a sealed vacuum power interrupter to es-
tablish and interrupt a primary circuit. Primary
connections to the associated metal-clad
switchgear are made by pole assemblies, elec-
trically and mechanically connected to the
vacuum interrupters. The operating mechanism
provides vertical motion at each pole location
in order to move the lower contact of the
vacuum interrupters from an open position to a
spring-loaded closed position and then back to
the open position on command.
The ML-19 mechanism (Figure 12) is a stored-
energy type mechanism and uses a gear motor
to charge a closing spring. During a closing op-
eration, the energy stored in the closing spring
is used to close the vacuum interrupter contacts,
charge the wipe springs which load the con-
tacts, charge the opening springs, and overcome
bearing and other frictional forces.
PowerVac ® 5kV Vertical Lift
Chapter 5. Operation
The energy then stored in the wipe and open-
ing springs will open the contacts during an
opening operation.
Closing and opening operations are controlled
electrically by the control switch on the metal-
clad door or remote relaying.
Mechanical control for maintenance or emergen-
cies is provided by manual close and trip but-
tons on the circuit breaker.
Also, the closing spring may be manually
charged (Figure 7) for de-energized checks and
maintenance.
Figure 12. Front View of ML-19 Mechanism with Front Cover Removed
1 Opening Spring
2 Charging Motor
3 Close Spring
4 Manual Close Button
5 Charge/Discharge Indicator
6 Manual Trip Button
7 Open/Close Indicator
8 Counter
9 Manual Charge Lever
10 Positive Interlock Switch
11 Close Relay
12 Cam shaft
13 Close coil
14 Close coil adjustment collar
15 Close latch check switch
16 Opening dashpot
17 Auzilary switch
18 MOC Plunger linkage
19 Positive interlock bar