Eaton Cutler-Hammer VCP-W, Инструкции по установке, эксплуатации и техническому обслуживанию

Страница: 30 / 48

I.B. 3A74792H04
Page 24
Effective 7/97
remains open, the reset lever holds down the moving
clapper to the yoke.
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 infor-
mation 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
circuit breaker into and out of the CONNECTED position
within the assembly structure. The levering mechanism
used to move the 38kV VCP-W circuit breaker is a mini-
mum effort recirculating ball drive design, and is part of
the assembly structure cradle. For additional information
concerning the levering mechanism, refer to the instruc-
tion manual supplied with the switchgear assembly.
Paragraph 4-8.1 of this manual provides details con-
cerning the use of the levering mechanism to move the
circuit breaker into and out of the CONNECTED position
within the assembly structure.
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 3-7).
5-8 GROUND CONTACT
The ground contact is an assembly of spring loaded fin-
gers providing a disconnectable means for grounding
the circuit breaker chassis, after it has been inserted
into a switchgear structure. The ground contact is locat-
ed 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 other 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) located in the switchgear cell. This MOC
operator permits the contacts of the MOC Switch to be
correlated with the circuit breaker’s contact position.
The cell mounted Truck Operated Cell Switch (TOC) is
operated by movement of the circuit breaker truck into
or out of the CONNECTED position.