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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).
Site Requirements

Site Requirements

Site Selection

STSs are applicable to common outdoor scenarios. The site should:

  • Not be located in a low-lying land. The horizontal level of the site should be above the highest water level of that area.
  • Be solid without spongy or soft soil, but not be prone to water accumulation or subsidence.
  • Be a well ventilated place.
  • Be far away from sources of strong variation, loud noises, and strong electromagnetic interference.
  • Avoid places where underground facilities exist.
  • Be far away from dust, oil smoke, harmful gas, and corrosive, flammable, or explosive objects.
  • Be at least 500 m away from airports, landfills, river banks, seacoasts, and dams.
  • Be an open area and at least 10 m from obstacles in all directions.
  • Be at least 50 m away from residential areas to avoid noise pollution.
  • Have a temperature ranging from –25°C to +60°C. When the ambient temperature exceeds 55°C, select an installation place with shade or set up an awning.

Foundation

Before installation, build a concrete pad and a trench on the selected ground. The foundation construction requirements are as follows:
  • The dimensions of the foundation should meet the installation and bearing requirements of the STS.
  • The average foundation strength should exceed 100 kg/cm2.
  • The horizontal error between the foundation and the contact surface of the STS should be less than 5 mm.
  • Bury a ground grid and reserve a ground copper bar at the ground position of the STS. The ground copper bar should be a hot-dip zinc-coated flat steel sheet with a cross-sectional area of 60 mm x 5 mm. One end of the copper bar should be connected to 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.
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Updated: 2019-12-05

Document ID: EDOC1100115701

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