Instruction
Book
Page 28
IB131009EN
5-1.4 "T" CUTOUT LOADING SPRING INDICATOR
The "T" cutout loading spring indicator is an additional
method provided to indicate conditions within the inter-
rupter, as well as the overall system condition. The visi-
ble "T" indicator is used to indicate whether the loading
springs are maintaining the proper contact pressure to
keep the contacts closed. Severe contact erosion or an
adjustment need after an interrupter replacement would
result in an unacceptable indication from the "T" indica-
tor (Figure
6-4
).
5-1.5 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 Eaton vacuum breakers, in order to
eliminate the need for field adjustments of wipe or
stroke.
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.
5-1.6 POLE UNIT SUPPORT MOLDING
DO NOT PLACE THE BREAKER IN ITS COMPART-
MENT WITHOUT ALL PARTS OF THE POLE UNIT
SUPPORT MOLDING BEING IN PLACE. THE
ABSENCE OF A COVER ON ALL 95 KV BIL RATED
BREAKERS FROM 630 THROUGH AND INCLUDING
1250 AMPERES CAN CAUSE A CATASTROPHIC
FAILURE RESULTING IN DEATH, SEVERE PERSON-
AL INJURY OR PROPERTY DAMAGE.
Figure 5-4a Type W-VAC 95 kV BIL breaker shown
with left hand cover removed for clarity purposes. All
three covers must be in place before application.
Figure 5-4b Type W-VAC 3150 ampere breaker close-
up of completely enclosed pole units
WARNING
Summary of Contents for 120W-VAC16
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