Smart scanning and protecting system for circuit failure

Abstract

The invention discloses a smart scanning and protecting system for a circuit failure. The system comprises two or more three-phase circuits arranged in parallel, multiple failure collecting units, multiple failure detection devices and one or more failure isolation devices. A first electrical signal collecting unit is arranged on a neutral point of the three-phase circuits, a second electrical signal collecting unit is arranged on the parallel line of the input ends of the two three-phase circuits, and a third electrical signal collecting unit is arranged on the parallel line of the output ends of the two three-phase circuits. An electric-conduction connecting arm is arranged on each failure isolation device, and electric-conduction connecting plugs are arranged at the two ends of each electric-conduction connecting arm respectively and make selective and conductive contact with the electric connection ends of the two ends of a failure source. The smart scanning and protecting system automatically positions and cuts off the failure source, and provides guarantees for safe operation of the circuits.

Description

technical field [0001] The invention relates to a circuit intelligent protection system, more specifically, the invention relates to a line fault intelligent scanning protection system. Background technique [0002] Single-phase grounding is a single-phase grounding of 10kV (35kV) small current grounding system. Single-phase grounding fault is the most common fault in power distribution system, which mostly occurs in humid and rainy weather. It is caused by many factors such as tree barriers, single-phase breakdown of insulators on distribution lines, single-phase disconnection, and small animal hazards. Single-phase grounding not only affects the normal power supply of users, but also may generate overvoltage, burn out equipment, and even cause phase-to-phase short circuit to expand accidents. [0003] In actual operation, the plastic cloth of the brick factory fell onto the wires due to strong winds, causing the voltage transformers of the substation to burn out, causing ...

AI Technical Summary

Problems solved by technology

Single-phase grounding not only affects the normal power supply of users, but also may generate overvoltage, burn out equipment, and even cause phase-to-phase short circuit to expand accidents

[0003] In actual operation, the plastic cloth of the brick factory fell onto the wires due to strong winds, causing the voltage transformers of the substation to burn out, causing equipment damage and large-scale power outages

After a single-phase ground fault occurs, resonant overvoltage may also occur, which may be several times higher than the normal voltage, endangering the insulation of the substation equipment, and in severe cases, the insulation breakdown of the substation equipment may cause a greater accident

[0004] After a single-phase grounding fault occurs, intermittent arcing grounding may occur, resulting in resonant overvoltage and overvoltage several times higher than the normal voltage. The overvoltage will further cause insulation breakdown of the insulator on the line, resulting in a serious short circuit accident. Burn down part of the distribution transformer, cause the lightning arrester and fuse insulation on the line to break down and burn out, and electrical fires may also occur

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