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38 kV Type VCP-WHD Simple Electrical
Ground & Test Device (SEG&TD) upper
terminal instruction booklet
This device is deeper than the standard VCP-WHD breaker. The
stored energy closing mechanism for the power grounding breaker
is the same as used in type VCP-WHD breakers. It is capable of
applying the ground against a "Live" circuit if operational errors have
not cleared the circuit. However, in such a case, the relaying at the
source of power is expected to cause the source interrupter to clear
the circuit.
2.1 Power grounding breaker operation
2.1.1 Closing
The power grounding breaker is closed by the remote operating
station at the end of a 50 ft. (15.24 m) long cable (supplied with the
device) upon depressing and holding the "CHARGE/CLOSE" and
"PERMIT" push-buttons (see Figure 3).
Figure 3. Push-buttons on the Remote Operating Control.
1.
The closing springs start to charge.
2.
After the springs are fully charged, they automatically discharge
to close the grounding breaker contacts.
Once the grounding breaker is closed, it can be locked in the
"Closed" position by removing the cable from the receptacle on the
device and rotating key KB and removing key KD from Lock #4 (see
Figure 4).
Figure 4. Key KD removed from Lock #4.
N
otee:
The device can also be locked in the "Closed" position by the mechani-
cal lift lock. Please see Section 2.3.3 for details.
2.1.2 Opening
The grounding breaker can be opened by manual operation of the
"Push to Open" button. To activate the "Push to Open" button,
insert key KD into the bottom cylinder of Lock #4 and rotate it in the
cylinder then remove key KB (see Figure 5). Turn the selector switch
to the "Open" position (see Figure 6). The "Push to Open" button is
now functional.
Figure 5. Key KD inserted and key KB removed from Lock #4.
Figure 6. Selector Switch in the "Open" position.
The grounding breaker can also be opened electrically using the
remote operating station (see Figure 3). The "OPEN" push-button
must be depressed.
N
otee:
For safety reasons, the breaker is prevented from opening in less than
20 seconds after closing.
2.2 38 kV SEG&TD interlocks and safety features
The 38 kV SEG&TD is designed to provide as many interlocks and
safety features as practical for the personnel performing any of the
operations described herein.
The device cannot be levered into or out of the "Connected" posi-
tion unless the grounding breaker is "Open" .
An indicator on the front panel shows the status of the
•
grounding breaker contacts, "Open- Ungrounded" or "Closed-
Grounded" (see Appendix A).
IB131012EN
Effective March 2016
EATON www.eaton.com
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