31
Instruction Book
IB182017EN February 2017 www.eaton.com
5kV, 7.5kV, & 15kV DHP-VR
Replacement Circuit Breaker
SECTION 5: INSPECTION & INSTALLATION
WARNING
BEFORE PLACING THE BREAKER IN SERVICE, CAREFULLY FOLLOW THE
INSTALLATION PROCEDURE BELOW AND THE SAFE PRACTICES SET
FORTH IN SECTION 2. NOT FOLLOWING THE PROCEDURE MAY RESULT IN
INCORRECT BREAKER OPERATION LEADING TO DEATH, BODILY INJURY,
AND PROPERTY DAMAGE.
When the breaker is first commissioned into service and each time
the breaker is returned to service, it should be carefully examined
and checked to make sure it is operating correctly.
5.1 EXAMINATION FOR DAMAGE
Examine the breaker for loose or obviously damaged parts. Never
attempt to install nor operate a damaged breaker.
5.1.1 NAMEPLATE VERIFICATION
Verify the information on the new VR-Series nameplate matches
the information on the purchase order. If any discrepancies exist,
notify Eaton’s Electrical Services & Systems for resolution prior to
proceeding.
5.2
SURE CLOSE
MECHANISM ADJUSTMENT
WARNING
FOR ALL TYPE DHP-VR HOUSINGS EQUIPPED WITH MECHANISM
OPERATED CELL (MOC) SWITCHES, THE STEPS OUTLINED IN
THIS PARAGRAPH MUST BE PERFORMED BEFORE INSTALLING A
REPLACEMENT DHP-VR CIRCUIT BREAKER. FAILURE TO COMPLY COULD
CAUSE SEVERE PERSONAL INJURY, DEATH, EQUIPMENT DAMAGE AND/
OR IMPROPER OPERATION
All Type DHP-VR breakers utilize the DHP-VR
SURE CLOSE
mechanism to control MOC velocity and closely mimic the dynamics
and velocities of older breakers. It is imperative that this mechanism
be adjusted to match the maximum number of MOC switches
(from 0 to 3) mounted in the cell. If the adjustment is made on the
DHP-VR breaker to be compatible with one housing with a given
number of MOC switches, make sure the adjustment is checked
and compatible if the breaker is moved to a different housing of the
same rating.
The breaker has been factory adjusted to operate one mechanism
operated cell (MOC) switch in the cell. This means that for
applications with either no MOC switch or one MOC switch, no
field adjustments are required. It is only for the cases of 2 or 3
MOC switches that the drive spring adjustment is required. The
adjustment is done with the breaker out of the cell, open and all
springs discharged. Refer to Figures 5.1 through 5.6 for reference
assistance.
Finally, the
SURE CLOSE
mechanism provides an effective way to
evaluate the condition of the MOC in the cell. If the
SURE CLOSE
drive spring is properly adjusted, but the MOC does not fully open
or close, it is time to maintain the MOC in the cell. Maintenance
usually means cleaning and lubricating the MOC mechanism.
If the MOC has seen a large number of cycles, however, worn
components may have to be replaced.
To adjust the
SURE CLOSE
drive spring for a specific number of
MOC switches, proceed with the following steps:
Sttp 1
: Remove the right hand phase barrier from the breaker
(Figure 3.4, 3.6, & 3.8).
Sttp 2
: Locate the MOC drive spring (Figure 5.1). It is located in
the left lower portion of the breaker as viewed from the top rear
of the breaker with the phase barriers removed.
Figurt 5.1. MOC Drivt Spring
Sttp 3
: From the factory, the drive spring comes set for 0 or 1
MOC switch. Refer to Figure 5.2 to see how that adjustment
would look. Notice that there is a nut and a jam nut on the
threaded rod to make the adjustment easy. Also notice that a
step gauge is provided and bolted next to the spring to further
simplify the adjustment (Figures 5.2 and 5.3).
Figurt 5.2. Drivt Spring Adjustmtnt for 0 or 1 MOC Switch
GAUGE
3MOC
2MOC
1MOC
ALIGN THIS
SURFACE WITH
THE STEP ON
THE GAUGE
RELATIVE TO
THE NUMBER
OF MOC
SWITCHES TO
BE OPERATED
Figurt 5.3. Drivt Spring Adjustmtnt Graphic
