STS-6000K-H1 Smart Transformer Station (Vietnam,
Duc Long Gai Lai)
Installation Guide
3 Equipment Installation
Issue 02 (2020-02-21)
Copyright © Huawei Technologies Co., Ltd.
16
the embedded ground grid, and the other end should be connected to the ground point of
the container. When burying a ground grid, leave a sufficient slack for the ground bar to
ensure its connection to the STS.
The ground resistance for the STS should be less than or equal to 0.1 ohm.
The STS adopts bottom cabling. Cables should be embedded under the LV room and MV
room in advance.
The inner diameter of the protective tube should not be less than 1.5 times the outer
diameter of the cable (including the protective layer).
The foundation should meet the local drainage requirements for the local historical
maximum rainfall. Drained water should be disposed of in accordance with local laws
and regulations.x
Check Items
No.
Check Item
Acceptance Criteria
1
Platform space
Scenario in which the distance between the platform and
the ground is less than or equal to 0.2 m: The distance
between the container and the platform is 0.1 m to 0.2 m.
Scenario in which the distance between the platform and
the ground is 0.2 m to 0.5 m: The distance between the
container and the platform is greater than or equal to 0.8 m.
Scenario in which the distance between the platform and
the ground is greater than 0.5 m: The distance between the
container and the platform is greater than or equal to 1.3 m.
2
Cabling space
at the bottom
If there is no maintenance space at the bottom, it is
recommended that the cabling space at the bottom of the
container be no less than 1.2 m.
If there is maintenance space at the bottom, it is
recommended that the cabling space at the bottom of the
container be no less than 1.5 m.
3
Cable
The bending radius of the LV and MV cables is not less
than 15 times the cable diameter.
The voltage drop of the farthest loop does not exceed 5%.
The sensitivity, voltage level, and thermal stability of the
cables meet the local design specifications.
The MV cable connector matches the size of the cables
used in the project. A sealing tube is used to prevent dust
condensation and arcing that may damage the cable
connector.
4
Pressure
releasing
pathway
A pressure releasing pathway is reserved under the MV
room. It is recommended that the STS be built on posts.
The distance between the bottom of STS and the ground is
greater than or equal to 300 mm.
It is recommended that protective plates be installed on the
door and side of the MV room. The purpose is to prevent
people around the STS from being burnt by an arc
explosion.
