SU1414681A1 - Apparatus for overvoltage protection of electric equipment of traction substation - Google Patents

Abstract

The invention relates to railway transport and can be used to protect electrical equipment. A high-voltage substation from overvoltages. The purpose of the invention is to increase electrical safety. The device contains a remote grounding 8, connected by an insulated from the ground wire 6 with a short circuit 5 and ground wire 9. When a short circuit inside the step-down transformer 4 short circuit 5 creates a single-phase target through insulated wire 6, ground protection cables 9 and remote grounding 8. District switch The substation relieves voltage from the power line. 1 il. 1G

Description

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The invention is intended for the control of electrical equipment for traction under the power stations of constant and alternating electrified iron from switching overvoltages relative to the ground when working with a short circuit.

i The purpose of the invention is to increase the electric 1) robustness when servicing a fueling substation.

; The drawing shows a diagram of the device.

Power lines 1 through disconnectors 2 and separators 3 are connected to step-down transformers 4 and 1 to close the connectors 5. Other terminals to close connectors 5 are connected to and from the ground cable 6, which connects them to one terminal of the protective arrester 7, outrigger 8 and a ground wire 9.

 One of the low side pins on the connecting transformers 4 is connected via line 10 to traction power supply 1 1 and grounding circuit 12 of the traction substation. A second output of the surge arrester 7 is connected to the circuit of the grounding substation.

1 The device operates as follows.

; In case of short circuit5, for example, inside one step-down transformer TPP 4, the corresponding loop con- nector 5 is connected and a circuit of an interphase closure is created via the insulated wire 6, lightning protection fuses SM and grounding conductors of the electric power substation, and a remote earthing switch 8, A switch of a district substation relieves voltage from a power line. During the empty pause, the separator 3 is disconnected, then the line

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voltage is applied again. The potential of the remote grounding conductor 8 and the short-circuiting short-circuit case with a single-phase short circuit in high-power supply systems exceeds tens of kilovolts. Therefore, short-circuits are installed on insulators, and an insulating insert is slammed into the short circuit breaker drive. To prevent atmospheric electricity short circuits from falling into the grounding cables between the insulated wire 6 and the grounding circuit 12 of the substation, a lightning arrester 7 is installed. Thus, due to the connection of the shortcuts with the grounding wires and the remote grounding switch, when the short circuit ejects on the ground circuit According to the electrical safety conditions, hazardous switching overvoltages do not occur in the suction line and rail tracks 6.

Claims (1)

Invention Formula An overvoltage protection device for a traction substation that contains short-circuits connected by one output to one of the phases of the power line with lightning cables and arresters, and the other to the grounding circuit of the traction substation, characterized in that : and electrical safety, it is supplied with a gage and a remote ground, connected galvanically with ground wire and a wire, grounded from the ground, with a different output of shorting connectors, and through a glitter - with a ground loop laziness of the substation, with the case of a short-circuiting device isolated from the ground, its drive from the case. R