Bus protection module for ground signal blocking

Abstract

The present invention provides a busbar protection module for grounding signal blocking, including a microprocessor, an arc signal generation circuit, an arc signal processing circuit and a grounding signal acquisition circuit; the arc signal generation circuit is used to collect arc signals in the busbar chamber; The arc signal processing circuit is used to transmit the arc signal to the microprocessor; the ground signal acquisition circuit is used to collect the ground signal on the low voltage side of the transformer, and transmit the ground signal to the microprocessor; the microprocessor's The output end is connected to the trip coil TQ through the coil control circuit to control whether the trip coil is energized; the invention can collect the arc light signal in the busbar room to determine the fault point in the busbar room, and it is not necessary to cooperate with the lower power supply line protection module to determine the fault point , to ensure that the circuit breaker DL_G or \ and the circuit breaker DL_D trip immediately, prevent the 8-step accident evolution model described in the background technology from occurring, and avoid burning the transformer.

Description

Technical field: [0001] The invention relates to the field of power supply safety, in particular to a busbar protection module with grounding signal blocking. Background technique: [0002] At present, the substations of 110Kv and below in urban and rural areas in my country generally adopt the closed busbar structure, such as figure 1 Its salient features are as follows: [0003] (1) The low-voltage side busbar runs through the entire 2 groups of closed high-voltage switch cabinets placed in rows; [0004] (2) The low-voltage side of transformer 1 adopts delta connection, and the short-circuit arc is easily induced at the moment of single-phase grounding contact or disconnection; [0005] (3) The transformer 1 low-voltage side busbar protection is not equipped. When the low-voltage busbar is short-circuited, the fault is removed by the transformer 1 backup protection module; [0006] like figure 1 , figure 2 and image 3 Shown: The working principle of the backup pro...

AI Technical Summary

Problems solved by technology

[0004] (2) The low-voltage side of transformer 1 adopts delta connection, and the short-circuit arc is easily induced at the moment of single-phase ground contact or disconnection;

[0005] (3) It is not equipped with transformer 1 low-voltage side busbar protection. When the low-voltage busbar is short-circuited, the backup protection module of transformer 1 will cut off the fault;

[0009] 1: The initial fault is single-phase grounding;

[0010] 2: A short-circuit arc will be caused at the moment of contact or disconnection of the grounding point;

[0011] 3: The arc to the ground gradually increases, causing an arc between phases;

[0012] 4: The superposition of ground-to-ground arc and phase-to-phase arc causes rapid deterioration of phase-to-phase insulation;

[0013] 5: Phase-to-phase insulation deterioration causes phase-to-phase short circuit;

[0015] 7: Cause the "burning company" type equipment to burn down, even burn down the protection power supply of all equipment, so that the protection of the whole station will fail;

[0018] The busbar in the high-voltage switchgear 2 is not equipped with protection devices. Therefore, when the short-circuit fault point occurs on the busbar, the backup protection module of the transformer 1 needs to take out the short-circuit current and then delay tripping. Company"

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