Electrical equipment of cranes with voltage above 1 kV

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 5. Electric power plants

Crane electrical equipment. Electrical equipment of cranes with voltage above 1 kV

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

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5.4.59. The requirements given in 5.4.60 - 5.4.69 apply to cranes with voltages above 1 kV and are additional to the requirements given above in this chapter.

5.4.60. Electrical equipment above 1 kV, located on cranes both openly and in electrical rooms, must be carried out in accordance with the requirements of Ch. 4.2.

5.4.61. Sectioning, installation of repair cars and light signaling on the main crane trolls are not required.

5.4.62. The clear distance between the main trolleys and the crane shall be at least 1,5 m horizontally (for the exception see 5.4.63 and 5.4.64). When the main trolleys are located above the crane platforms, on which people can be during operation or during the repair of the crane, the trolleys must be located at a height of at least 3 m from the platform level, and the platform must be fenced from above with a net.

5.4.63. The platform for installation of current collectors of the main trolleys must have a fence with a door (hatch). The horizontal distance from the main zip lines to this square should be at least 0,7 m.

5.4.64. The design of the current collectors of the main trolleys must allow them to be disconnected from the trolleys, while the disconnector in front of the circuit breaker (see 5.4.65) may not be installed. The distance between the trolleys and the current collectors withdrawn from them must be at least 0,7 m.

The current collector drive must have a device for locking with a lock, with the current collectors retracted, as well as an indicator: "Enabled", "Disabled".

5.4.65. Switching off and on by means of current collectors of the main trolleys of the working current, the no-load current of the transformer and the electric motor with a voltage above 1 kV is not allowed. The crane must be equipped with a switch on the higher voltage side, designed to cut off the operating current.

On the higher voltage side of the transformer, it is allowed to install a switching device designed to disconnect only the no-load current of the transformer, while before disconnecting the transformer at the highest voltage, the entire load must be preliminary disconnected.

5.4.66. The door (hatch) to the platform for installing current collectors (see 5.4.63), the drive of current collectors (see 5.4.64) and the switch (see 5.4.65) must have interlocks that ensure the following:

1. The operation of the drive of current collectors for disconnection from trolleys and connection to them should be possible only after the circuit breaker is turned off.

2. Opening the door to the area for installing the current collectors should be possible only after the current collectors have been moved away from the trolleys to the extreme off position.

3. The operation of the current collector drive to connect them to the trolleys should be possible only after closing the door to the site for installing the current collectors.

4. Turning on the circuit breaker should be possible only after the current collectors are connected to the trolleys and after the current collectors are moved away from the trolleys to the extreme off position.

5.4.67. It should be possible to install a jumper connecting and grounding all phases of current collectors.

5.4.68. For the performance of repair work, the power supply of the crane with a three-phase voltage of not more than 380/220 V must be provided.

5.4.69. When installing faucets outdoors, you should:

1) protect the main trolleys from atmospheric surges and ground them in accordance with the requirements of Ch. 2.5;

2) the transformer and electric motors with voltage above 1 kV, installed on the crane, must be protected from atmospheric surges.

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

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