Grounding signal blocking bus protection module

Abstract

The invention provides a grounding signal blocking bus protection module. The module comprises a microprocessor, an arc light signal generation circuit, an arc light signal processing circuit and a grounding signal acquisition circuit; the arc light signal generation circuit is used for acquiring the arc light signal in a bus chamber; the arc light signal processing circuit is used for transmitting the arc light signal to the microprocessor; the grounding signal acquisition circuit is used for acquiring a grounding signal of a low voltage side of a transformer and transmits the grounding signal to the microprocessor; an output end of the microprocessor is connected with a trip coil TQ through a coil control circuit, and the microprocessor controls whether to electrify the trip coil. The module provided by the invention can acquire the arc light signal in the bus chamber and confirm that a fault point is in the bus chamber, can confirm the fault point without performing delayed cooperation with a lower level power supply circuit protection module, guarantees that a breaker DL-G or / and a breaker DL-D trips immediately, and can prevent occurrence of an 8-step accident evolution modelin the background technology and avoid over burning of the transformer.

Description

Technical field: [0001] The invention relates to the field of power supply safety, in particular to a bus protection module for grounding signal blocking. Background technique: [0002] At present, substations of 110Kv and below in urban and rural areas in my country generally adopt closed busbar structure, such as figure 1 As shown, its salient features are as follows: [0003] (1) The bus bar on the low-voltage side runs through 2 sets 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 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; [0006] Such as figure 1 , figure 2 and image 3 As shown: the working principle of the transfor...

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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