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Instruction Book
Effective: February 2007
Page 29
I.B. 8295A61H07
For more information visit:
www.EatonElectrical.com
Figure 5-5 Typical Cutler-Hammer Vacuum Interrupter
Shown Attached to Non-Sliding Current Transfer
System
5-2.3 “T” CUTOUT LOADING SPRING INDICATOR
The “T” cutout loading spring indicator is an additional
method provided to indicate conditions within the
interrupter, as well as the overall system condition. The
visible “T” indicator is used to indicate whether the
loading springs are maintaining the proper contact
pressure to keep the contacts closed. Severe contact
erosion would result in an unacceptable indication from
the “T” indicator (Figures
7-4
and
7-5
)
.
5-2.4 CONTACT WIPE AND STROKE
Contact wipe is the indication of (1) the force holding the
vacuum interrupter contacts closed and (2) the energy
available to hammer the contacts open with sufficient
speed for interruption.
Stroke is the gap between fixed and moving contacts of
a vacuum interrupter with the breaker open.
The circuit breaker mechanism provides a fixed amount
of motion to the operating rods. The first portion of the
motion is used to close the contacts (i.e. stroke) and the
remainder is used to further compress the preloaded
wipe spring. This additional compression is called wipe.
Wipe and Stroke are thus related to each other. As the
stroke increases due to the erosion of contacts, the wipe
decreases. A great deal of effort has been spent in the
design of all Cutler-Hammer vacuum breakers, in order
to eliminate the need for field adjustments of wipe or
stroke.
CAUTION
THERE IS NO PROVISION FOR IN-SERVICE
ADJUSTMENTS OF CONTACT WIPE AND STROKE.
ALL SUCH ADJUSTMENTS ARE FACTORY SET
AND SHOULD NOT BE ATTEMPTED IN THE FIELD.
5-3 STORED ENERGY MECHANISM
WARNING
KEEP HANDS AND FINGERS AWAY FROM THE
BREAKER’S INTERNAL PARTS WHILE THE
BREAK-ER CONTACTS ARE CLOSED OR THE
CLOSING SPRINGS ARE CHARGED. THE
BREAKER CONTACTS MAY OPEN OR THE
CLOSING SPRINGS DISCHARGE CAUSING A
CRUSHING INJURY. DISCHARGE THE SPRINGS
AND OPEN THE BREAKERS BEFORE
PERFORMING ANY BREAKER MAINTENANCE,
INSPECTION OR REPAIR.
The spring stored energy operating mechanism is
arranged vertically in front of all VCP-WR breakers. It
includes all the elements for storing the energy, closing
and tripping of the breaker, as well as manual and
electrical controls. The manual controls are all front
accessible. Motion to close and open the interrupter
contacts is provided through operating rods connecting
the mechanism pole shaft to the bell cranks of the
interrupter assemblies.
5-3.1 OPERATION OF STORED ENERGY
MECHANISM
The mechanism stores the closing energy by charging
the closing springs. The mechanism may rest in any one
of the four positions shown in Figure
5-6
and as
follows:
a. Breaker open, closing springs discharged
b. Breaker open, closing springs charged
c. Breaker closed, closing springs discharged
d. Breaker closed, closing springs charged
Содержание Cutler-Hammer VCP-WR Series
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