Cutler-Hammer W-VAC Anweisungen für Installation, Betrieb und Wartung - Seite 19

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CUTLER-HAMMER 24kV Type W-VAC Circuit Breaker

4-8 ELECTRICAL OPERATION CHECK

After having completed all previous checks and

tests, the circuit breaker is ready to be operated

electrically. It is preferred that this check be

made with the circuit breaker in a TEST position

or by using a test cable, if the circuit breaker is

outside the cell structure.

CAUTION

BEFORE INSERTING THE CIRCUIT

BREAKER EXAMINE THE INSIDE OF THE

CELL STRUCTURE FOR EXCESSIVE DIRT

OR ANYTHING THAT MIGHT INTERFERE

WITH THE CIRCUIT BREAKER MOVEMENT.

WARNING

EXTREME CAUTION MUST BE EXERCISED

TO INSURE THAT PRIMARY CIRCUITS ARE

NOT ENERGIZED WHILE CHECKS ARE

PERFORMED IN THE CIRCUIT BREAKER

COMPARTMENT. FAILURE TO DO SO MAY

RESULT IN PERSONAL INJURY OR DEATH.

The circuit breaker is normally tested electrically

in its cell structure in the TEST position. To

achieve the TEST position, the circuit breaker

must first be placed in the cell structure and the

secondary contacts engaged. To complete this

testing procedure, the operator should first be

familiar with inserting and removing the circuit

breaker into and from the cell structure.

4-8.1

CIRCUIT BREAKER INSERTION AND

REMOVAL

NOTICE

Make certain that the levering nut is all of

the way forward in the TEST position before

attempting to insert a circuit breaker into its

compartment (FIG 4-2).

The extension rails must first be put into

position. Carefully engage the left and right

extension rails to the fixed structure rails and

ensure they are properly seated in place (Figure

4-3). Once the extension rails are properly in

place, the circuit breaker can be carefully

loaded on the extension rails using an overhead

Effective 12/98

lifter and lifting yoke. Remove the lifting yoke

when the circuit breaker is securely seated on

the extension rails.

Push the circuit breaker into the compartment

(the handles MUST be used to prevent the

breaker from tipping) until the TEST position is

reached as confirmed by the metallic sound of

the breaker levering latch engaging the levering

nut (Figures 4-2 and 4-4). Once the circuit

breaker is in the TEST position, the extension

rails can be removed.

To engage the circuit breaker secondary

contacts, raise the handle to the secondary

disconnect cage and pull the cage forward as

far as possible (Figure 4-5). As soon as control

power is available, the motor will start charging

the closing springs.

DO NOT USE ANY TOOL OTHER THAN THE

LEVERING CRANK (Figure 3-1) PROVIDED

TO LEVER THE CIRCUIT BREAKER FROM

TEST OR CONNECTED POSITIONS.

CORRECT OPERATION OF SOME OF THE

INTERLOCKS IS DEPENDENT ON THE USE

OF THE PROVIDED LEVERING CRANK.

PERSONAL INJURY OR EQUIPMENT

DAMAGE COULD RESULT FROM THE USE

OF A TOOL OTHER THAN THE PROPER

LEVERING CRANK.

The circuit breaker and integral levering

mechanism includes all necessary

interlocks that when interfaced with a

compatible Type W-VAC enclosure will

render the circuit breaker mechanism

mechanically and electrically trip-free during

the levering process. For information

pertaining to individual interlocks, refer to

paragraph 4-9 in this section.

To move the circuit breaker to the

CONNECTED position, engage the levering

crank with the structure mounted levering shaft

(Figure 4-6). Turn the levering crank in the

clockwise direction and the circuit breaker will

move slowly into the enclosure. When the

circuit breaker reaches the CONNECTED

position, it will become impossible to continue

turning the levering crank. Secondary contacts

Page 14 of 47

I.B. 8801C71H01

WARNING