I.B. 70A2580H02
Page 23
Effective November 2012
5. When the circuit breaker closes, the reset lever moves
away from the moving clapper. If the Under-voltage
Trip Device coil has at least 85% of the rated voltage
applied, the moving clapper is held to the yoke by the
magnetic force, even though the reset lever has
moved up.
5-5 INTERLOCKS AND INTERFACING
Refer to Paragraph 4-9 of this manual for detailed
information concerning circuit breaker interlocks and their
interfacing with a switchgear structure compartment. In
addition, refer to the instruction manual supplied with
the switchgear assembly.
5-6 LEVERING MECHANISM
The purpose of the levering mechanism is to move the
drawout VCP-Wind circuit breaker between the TEST
position and the CONNECT position within the assembly
structure. The levering mechanism used to move the
circuit breaker requires minimum effort, and is an integral
part of the circuit breaker assembly.
Figure 5-7 38kV VCP-Wind in Breaker Mini Module
5-7 OPERATIONS COUNTER
All circuit breakers are equipped with a mechanical
operations counter. As the circuit breaker opens, the
linkage connected to the pole shaft lever advances
the counter reading by one (Figure 3-4).
5-8 GROUND CONTACT
The ground contact used with the drawout VCP-Wind
circuit breaker is an assembly of spring loaded fingers
providing a dis-connectable means for grounding the
circuit breaker chassis, after it has been inserted into
a switchgear structure. The ground contact is located
on the lower left portion of the truck chassis. An
extension of the switchgear ground bus is secured to
the cell floor in such a position to engage the ground
contact automatically, when the circuit breaker is
moved into the DISCONNECT/TEST position. It
remains engaged in all circuit breaker positions within
the cell.
5-9 MOC AND TOC SWITCH OPERATIONS
A MOC operator integral to the circuit breaker
engages an operating lever of the Mechanism
Operated Cell Switch (MOC) integral to the circuit
breaker. This MOC operator permits the contacts of
the MOC Switch to be correlated with the circuit
breaker’s contact position.
The integral mounted Truck Operated Cell Switch
(TOC) is operated by movement of the circuit breaker
truck into or out of the CONNECT position.