Small current grounding line selection device

Abstract

The invention discloses a small current grounding line selection device. The small current grounding line selection device comprises a main body, which is electrically connected with a voltage transformer and a grounding circuit. The main body is provided with a zero sequence current transformer output terminal, and one end of the zero sequence current transformer output terminal is electrically connected with CT terminals, and the other end of the zero sequence current transformer output terminal is electrically connected with a CPU. The CPU is electrically connected with a zero sequence current transformer and a secondary line connection device. The surface of the main body is provided with a display screen, a plurality of indicating lamps, and a plurality of buttons. The zero sequence current transformer comprises an A-phase current transformer, a B-phase current transformer, and a C-phase current transformer, and at the same time, a current circuit adopts three-phase current wiring. A central controller is disposed in the housing. The CPU, the display screen, the indicating lamps, the buttons, the A-phase current transformer, the B-phase current transformer, and the C-phase current transformer are electrically connected with the central controller.

Description

technical field [0001] The invention relates to the field of power supply, in particular to a small current grounding line selection device. Background technique [0002] The neutral point is not grounded or the neutral point is grounded through the arc suppression coil. The power grid is generally used in 35KV and below substations. When the two grounding methods are single-phase grounded in the system, the current flowing through the grounding point is equal to the line distributed capacitance current The value is small. Therefore, these two grounding methods are called small current grounding methods. The advantage of the low-current grounding system is that the system can supply power normally after a single-phase grounding occurs, but it is difficult to quickly and accurately indicate the grounding loop due to the inconspicuous fault characteristics. [0003] Aiming at the problems in the related technologies, no effective solution has been proposed yet. Contents of...

AI Technical Summary

Problems solved by technology

The advantage of the low-current grounding system is that after a single-phase grounding occurs, the system can supply power normally, but it is difficult to quickly and accurately indicate the grounding loop due to the inconspicuous fault characteristics

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