STS-6000K-H1 Smart Transformer Station (Vietnam,
Duc Long Gai Lai)
Installation Guide
5 Operating Components
Issue 02 (2020-02-21)
Copyright © Huawei Technologies Co., Ltd.
31
Switch operation process: After turning on the grounding switch of the outgoing cable
cabinet at the booster station, take out the key to the grounding switch of cabinet G1.
After the key is returned, you can turn off the grounding switch of the outgoing cable
cabinet.
Mechanical lock K1 is configured at the operation hole of the grounding switch in
cabinet G1. After the K1 key is inserted, you can turn on or off the grounding switch.
You can remove the K1 key only after the grounding switch is turned off.
Mechanical lock (not a padlock) K2 is configured at the operation hole of the grounding
switch in cabinet G3. After the K2 key is inserted, you can turn on or off the grounding
switch. You can remove the K2 key only after the grounding switch is turned on.
Based on the hand-in-hand connection diagram of the STSs obtained from the customer,
put the K2 key of cabinet G3 in STS 1 and the K1 key of cabinet G1 in STS 2 on the
same key ring. Mark the STS and switch numbers on the labels. The operations for STS
2 and STS 3 are similar. Turn on the grounding switch of cabinet G3 in the last STS.
Remove the K2 key and hand it over to the O&M personnel.
For the first STS closest to the booster station, the key to the grounding switch of cabinet
G1 needs to be interlocked with the outgoing cable knife switch of the booster station.
The interlocking logic is the same as that of STSs. If the knife switch does not have the
interlocking function, interlocking can be performed with the disconnector. The
operation hole of the disconnector should be equipped with a mechanical lock (not a
padlock). After the key is inserted, the disconnector can be turned on and off. The key
can be removed only after the disconnector is turned off.
If the disconnector and the grounding switch do not have the interlocking function, turn
off the grounding switch of cabinet G1 and remove the key. Then hand the key over to
the O&M personnel for proper storage. According to the requirements, interlock the
grounding switch of the booster station with that of the first STS to ensure operation
safety.
Figure 5-5
Interlocking between STSs with a CVC ring main unit
