34
Instruction Book
IB182017EN February 2017 www.eaton.com
5kV, 7.5kV, & 15kV DHP-VR
Replacement Circuit Breaker
NOTICE
AS SOON AS THE SECONDARY CONTACTS MAKE UP, THE MOTOR WILL
CHARGE THE CLOSING SPRING, IF THE CONTROL CIRCUIT IS ENGAGED.
c. To engage the secondary contacts on the 5kV design, lift the
handle on the front left hand side of the breaker chassis to a
horizontal position. Once the rod is pointing straight out from
the breaker, push it manually to the rear until the secondaries
are initially engaged. At this point, the small horizontal pin in the
handle will have engaged two slots in the lever, which is pivoted
immediately above the handle. To insure complete secondary
engagement, push down firmly on the curved end of the lever as
far as it will go, using your foot or hand. When using a foot, care
should be taken not to bend the lever by using excessive force.
d. For final engagement of the secondary contacts, unlatch the
secondary operating rod, and move it to the left, until it points
straight out from the breaker. (Figure 5.11) Push the rod manually
to the rear until the secondaries are initially engaged. Once initial
engagement is achieved, hold the operating rod firmly in that
position with one hand, while grasping the secondary engaging
Figurt 5.10. Engagtmtnt of 5kV DHP-VR Stcondary Contact
Figurt 5.12. Racking tht 15kV DHP-VR
5.11 RACKING BREAKER INTO CELL
Trip the breaker open before attempting to rack it into the cell. A
mechanical interlock will prevent racking the breaker into or out of
the cell, if the breaker is closed.
WARNING
EXCESSIVE FORCE, APPLIED TO THE RACKING MECHANISM WHILE THE
BREAKER IS CLOSED, COULD SHEAR OFF THE PIN THAT THE RACKING
CRANK ENGAGES DURING OPERATION.
WARNING
WHILE RACKING THE BREAKER, NOTE ANY SUDDEN RESISTANCE
TO RACKING OR SIGNS OF BINDING. DETERMINE THE CAUSE OF
INTERFERENCE AND CORRECT, AS APPROPRIATE, BEFORE PROCEEDING.
Press down on the rail latch on the front right side of the breaker
with your foot, and push the breaker toward the rear of the cell as
far as it will go. Be sure the breaker is pushed in until it stops. This
will bring the racking nut on the breaker up to the screw in the cell.
Engage the racking crank on the racking shaft, push moderately
toward rear of the cell, and turn crank clockwise. (Figure 5.12)
The breaker will move slowly toward the rear of the cell. After
the breaker starts to move, it is not necessary to push. Continue
cranking until the crank turns freely, and the breaker stops moving.
When the breaker is fully engaged, the faceplate will almost touch
the cell frame angles. The breaker is now in the OPERATING or
ENGAGED position, and may be operated electrically using the
control switch on the cell door.
5.12 REMOVING BREAKER FROM CELL
NOTICE
THE BREAKER MAY BE OPEN AND ITS CLOSING SPRING MAY DISCHARGE
AS IT IS WITHDRAWN FROM THE CELL. IT DEPENDS ON WHETHER THE
BREAKER WAS LEFT CLOSED OR OPEN, OR WHETHER THE SPRING WAS
LEFT CHARGED OR DISCHARGED.
To remove the breaker from the operating position, trip the breaker
open, and engage the racking crank on the racking device shaft. Turn
the crank counterclockwise until the crank rotates freely. Pull the
breaker toward the front of the cell until the rail latch engages the
slot in the rail. The breaker is now secured in the TEST position.
To remove the breaker from the cell, press down on the rail latch to
free the breaker from the rail. Pull the breaker out of the cell.
handle with the other hand. The secondary engaging handle is
located to the right of the operating rod, just inside a rectangular
hole. By pulling firmly on the engaging handle, complete
secondary engagement will be insured.
e. The breaker may now be electrically closed and tripped by using a
control switch on the cell door, or it may be manually operated by
means of the close and trip buttons, located on the faceplate of
the breaker.
Figurt 5.11. Engagtmtnt of 15kV DHP-VR Stcondary Contact
