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.
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Figure 5-4
Closing the cabinet door
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5.2 Interlocking Between STSs with a CVC Ring Main
Unit
K1 and K2 are equipped with a key ring and a blank label.
Each STS and each switch have a unique number. The numbers are marked on the key label. If
cabinet G1 does not have a switch, mark the door number of the cable room.
Cabinet G1 of each STS connects to the power grid. Do not exchange the cables connected to
cabinets G1 and G3. Otherwise, the interlocking between STSs will be in disorder.
Put the interlock keys between STSs on key rings according to the cascading diagram. For the same
MV cable, put the key of its grounding switch in cabinet G3 and that in cabinet G1 on the same key
ring.
For the STS that is farthest from the booster station, turn on the grounding switch in cabinet G3,
remove the key, and deliver the key to the O&M personnel for proper storage.
