Instruction Book
Page 30
Effective: March 2007
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I.B
6513C80G
breaker contacts are closed. DHP-VR interlocks are
completely compatible with the existing levering screw
located in the existing DHP or DVP assembly
structure.
DHP-VR 5kV. breakers utilize a levering-in interlock
design that is very similar to the design used on DHP
breakers. A key, which is spring operated by the closing
and opening action of the breaker, prevents levering of
the breaker, unless the breaker is open. Opening the
breaker removes the key from the levering-in shaft
key-way, and the breaker can be levered.
DHP-VR 7.5 and 15kV. breakers utilize a device that
also prevents levering a breaker with the contacts
closed, but is different in design from the 5kV. breaker.
It consists of a plate supported by a pin between the
two pole shaft levers. As the breaker closes, the plate
falls into the levering-in shaft keyway, by virtue of
gravity. Opening the breaker lifts the plate out of the
keyway, and the breaker can be levered.
5-4.3 ANTI-CLOSE INTERLOCK
This interlock prevents release of the closing springs
electrically or manually, if the breaker is already closed
(Figure
5-6
)
.
On a closed breaker, the interlock lever
moves toward the rear. In this position, the movement
of the spring release clapper does not lift the lever, and
thus the spring release latch cannot be moved.
5-4.4 FLOOR TRIPPING AND CLOSING SPRING
RELEASE INTERLOCKS
The floor tripping and closing spring release interlocks
operate to trip the breaker and discharge the closing
spring when the breaker is inserted into the cell to the
test position, or removed from the cell. Cam plates on
the cell floor lift trip levers on the underside of the
breaker to trip the breaker and/or discharge the closing
springs (Figures
5-12
and
5-13
).
The floor tripping interlock also operates to hold the
breaker trip-free while it is traveling between the Test
and Connected positions. This is to prevent accidental
closing of the breaker in an intermediate position.
5-4.5 RAIL LATCH
The main function of the rail latch is to prevent damage to
the levering-in screw and nut (Figures
5-14
and
5-15
).
It
also functions to latch the breaker in the Test position, as
previously described in Section 4-8b.
Figure 5-10 Code Plate Installed On 5 kV DHP-VR Breaker
Figure 5-11 Code Plate Installed On 15 kV DHP-VR Breaker
