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STS-(3000K, 6000K)-H1 Smart Transformer Station Installation Guide
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Interlocking Between STSs

Interlocking Between STSs

  • 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.

Interlocking between STSs with a DVC ring main unit

Switch operation process: After turning on the grounding switch of the outgoing cable cabinet at the booster station, take out the key to the cable room door of cabinet G1. After the key is returned, you can turn off the grounding switch of the outgoing cable cabinet.

  1. Mechanical lock K1 is configured at the operation hole of the cable room door of cabinet G1. After the K1 key is inserted, you can open the door. You can remove the K1 key only after the door is closed.
  2. 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.
  3. 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.
  4. For the first STS closest to the booster station, the key to the cable room door 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.
  5. If the grounding switch does not have the interlocking function, close the door 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 the cable room door of cabinet G1 of the first STS to ensure operation safety.

    Figure 5-7 Interlocking between STSs with a DVC ring main unit

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Updated: 2019-12-05

Document ID: EDOC1100115701

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