Circuit Breaker Performance Check - Eaton VCP-W Series Instructions For Installation/Operation/Maintenance/Servicing

Instructions for installation,
operation, and maintenance of type
VCP-W vacuum circuit breakers
Breaker pan assembly:
Call out descriptions for Figure 12 and 13.
1. Grounding contact grounds the breaker in the DISCONNECT,
TEST, and CONNECTED positions.
2. The levering system prevents removal of the breaker in any
position other than the DISCONNECT position (BPI pan) or
DISCONNECT/TEST position (non-BPI pan).
3. The control wiring is arranged for pullout disconnecting by means
of a 25-point female receptacle arranged to connect to a male
plug on the breaker. The secondary disconnect is the connection
for the control leads between the removable breaker and the
stationary housing.
Automatic secondary: Figure 12 represents an automatically
engaged secondary, as offered on the BPI pan assembly,
requires no manual input from the customer to engage the
secondary harness. The secondary harness will engage auto-
matically when the breaker is levered-in to the discrete TEST
position.
The secondary harness will then disengage automatically when
the breaker returns to the DISCONNECT position.
Manual secondary: Figure 13 represents a manually engaged
secondary assembly which requires the customer to engage
the secondary harness manually when the breaker is in the
DISCONNECT position. When engaged, the breaker will now be
in the TEST position.
Automatic/manual hybrid secondary (optional): Figure 46
represents an automatic engaging secondary with a manual
release feature incorporated into the BPI pan assembly. It
requires the customer to manually lift up the secondary release
lever to allow the secondary harness to engage the breaker in
the DISCONNECT/TEST position.
The secondary harness will then disengage automatically when
the breaker returns to the DISCONNECT/TEST position.
4. Racking screw performs breaker insertion and withdrawal.
5. Moving block couples to breaker for insertion and withdrawal.
6. Slider is used with #8 to prevent levering a closed breaker. May
also be used in conjunction with #12 to padlock a breaker in
either position.
7 . Indicates when the breaker is in the fully connected position.
Breaker position indication (BPI) label: Figure 12 represents
positive indication of breaker location at any position through use
of a colored label mounted on the top flange of the right hand rail
assembly. Green indicates the DISCONNECT position, yellow
indicates the TEST position, and red indicates the CONNECT
position. Upon arriving at any of the three discrete positions;
DISCONNECT, TEST, and CONNECT, there is a black mark that
aligns with the breaker cover to indicate exact location.
Standard indication: Figure 13 represents positive indication
of the breaker in the CONNECT position by use of a red flag
that rotates into viewing position when the breaker is fully
connected.
8. Slider interlocks:
BPI pan assembly: Figure 12 displays the "L " shaped slider
interlock that enables tripping of a closed breaker by pushing in
on the slider (item 6) that prevents access to the racking screw.
Non-BPI pan assembly: Figure 13 displays the "Z" shaped
slider interlock that prevents a closed breaker from being levered
out of the cell.
Instruction Booklet IB131006EN
9. The breaker mechanism-operated cell (MOC) switch is an
assembly of switches that is operated by a lever on the breaker
mechanism. It can contain as many as 15 normally closed and
15 normally open contacts (beneath the cover) in the standard
design.
The MOC switch is activated by the breaker closing. It extends
a plunger out the bottom of the mechanism and pushes down on
the MOC switch operating mechanism. This, in turn, transmits
the motion to operate the switch.
10. The truck operated cell (TOC) switch has nine poles - four
normally open and five normally closed contacts that change
state as the breaker is levered to the connected position. As the
breaker is being levered into the connected position, a bracket
on the breaker pushes the TOC switch lever during the last inch
of travel. As a result, the TOC switch can be used to electrically
indicate whether or not the breaker is in the connected position
(beneath cover).
11. Code plates: (see Interface interlocks/interfacing check, Section
4.9.1).
12. Provision for padlocking a breaker in any position. Also a location
for a key interlock.
13. Picture frame provides a closed barrier to the primary compart-
ment when the breaker is connected.
14. Rail on which the breaker rolls.
15. Optional MR2 integral racking provisions for inclusion during
manufacturing or aftermarket.
For additional information on the levering mechanism, refer to para-
graph 5.6 in this manual.

4.8.2 Circuit breaker performance check

1. Study and understand the electrical drawings furnished with
each switchgear system.
2. Install the circuit breaker in the DISCONNECT position.
3. Engage secondaries or lever breaker to TEST position to auto-
matically engage secondaries:
Automatic secondary: To engage secondary harness, lever the
breaker to the TEST position to engage the control circuit.
Manual secondary: To engage secondary harness, lift and pull
the secondary disconnect forward to engage the control circuit.
N ote: It is recommended that the power to the secondary connector
be de-energized prior to manually engaging the secondaries to prevent
damage to the secondary pins associated with the spring charging motor
circuit.
Automatic/manual hybrid secondary (optional): To engage
secondary harness, lift and release the secondary disconnect so
that it automatically slides forward to engage the control circuit.
4. Verify breaker operation; once the secondaries are engaged the
closing springs will automatically charge unless inhibited by the
switchgear control circuit, the condition will be indicated by a
Spring Charged/Discharged indicator on the front of the circuit
breaker (Figure 7). In addition, the status of the main contacts,
open or closed, is indicated on the front of the circuit breaker.
Close and trip the circuit breaker several times to verify closing
and tripping operations. Conclude by closing the circuit breaker.
The circuit breaker is now closed in the TEST position with
springs charged.
Effective March 2019
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