Complete, pole, mast transformer substations and network sectioning points

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 4. Switchgears and substations

Switchgears and substations with voltages above 1 kV. Complete, pole, mast transformer substations and network sectioning points

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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4.2.122. The requirements given in 4.2.123 - 4.2.132 reflect the features of transformer substations for outdoor installation of complete (KTP), pole (STP), mast (MTP) with high voltage up to 35 kV and low voltage up to 1 kV, as well as network sectioning points (SSP) with voltage up to 35 kV.

In all other respects not specified in 4.2.123 - 4.2.132, the requirements of other paragraphs of this chapter should be followed.

4.2.123. The connection of the transformer to the higher voltage network must be carried out using fuses and a disconnector (load switch) or a combined fuse-disconnector with a visible open circuit.

The switching device must be controlled from the ground. The drive of the switching device must be padlockable. The switching device must have earthing switches on the side of the transformer.

4.2.124. The switching device MTP and STP, as a rule, should be installed on the terminal (or branch) support of the overhead line.

The switching device of KTP and SSP can be installed both on the terminal (branch) support of the overhead line, and inside the KTP and SSP.

4.2.125. At substations and SSPs without fencing, the vertical distance from the ground surface to non-insulated current-carrying parts in the absence of traffic under the terminals should be at least 3,5 m for voltages up to 1 kV, and for voltages of 10 (6) and 35 kV - according to Table. 4.2.7 'E' dimension.

At substations and SSPs with a fence at least 1,8 m high, the indicated distances to uninsulated current-carrying parts with a voltage of 10 (6) and 35 kV can be reduced to the size 'G' specified in Table. 4.2.5. At the same time, in the plane of the fence, the distance from the busbar to the edge of the outer fence must be at least the size 'D' indicated in the same table.

For air inlets crossing passages or places where traffic is possible, the distance from the lower wire to the ground should be taken in accordance with 2.5.111 and 2.5.112.

4.2.126. To service the MTP at a height of at least 3 m, a platform with railings should be arranged. For climbing to the site, it is recommended to use ladders with a device that prohibits climbing on it when the switching device is turned on.

For STP, the device of platforms and stairs is not necessary.

4.2.127. Parts of the MTP that remain energized when the switching device is turned off must be out of reach (1.7.70) from the site level. The disabled position of the apparatus must be visible from the platform.

4.2.128. On the low voltage side of the transformer, it is recommended to install a device that provides a visible break.

4.2.129. The wiring in the MTP and STP between the transformer and the low-voltage switchboard, as well as between the switchboard and the low-voltage overhead line, must be protected from mechanical damage and carried out in accordance with the requirements given in Ch. 2.1.

4.2.130. For substations with a capacity of 0,25 MVA and less, lighting of the low-voltage shield is not allowed. Lighting and sockets for turning on portable devices, tools at substations with a capacity of more than 0,25 MVA must be powered by a voltage not exceeding 25 V.

4.2.131. According to the condition of fire safety, substations should be located at a distance of at least 3 m from buildings of I, II, III degrees of fire resistance and 5 m from buildings of IV and V degrees of fire resistance.

It is also necessary to be guided by the requirements given in 4.2.68.

The distance from residential buildings to transformer substations should be taken at least 10 m, provided that acceptable normal levels of sound pressure (noise) are ensured.

4.2.132. In places of possible collision with vehicles, substations should be protected by bollards.

See other articles Section Rules for the installation of electrical installations (PUE).

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