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Smart Pole Permanent Magnet Vacuum Switch

A permanent magnet vacuum and switch technology, applied in the direction of automatic disconnection of emergency protection devices, electrical components, circuit devices, etc., can solve problems such as increasing safety hazards and increasing costs, and achieve compact structure, high insulation performance, and small size of the equipment. Effect

Inactive Publication Date: 2011-12-21
威胜百楚电力科技有限公司
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Problems solved by technology

However, this method also needs to install FTUs in each section and branch line of the line, which not only increases the cost, but also increases the safety hazard

Method used

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  • Smart Pole Permanent Magnet Vacuum Switch
  • Smart Pole Permanent Magnet Vacuum Switch
  • Smart Pole Permanent Magnet Vacuum Switch

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Embodiment Construction

[0020] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] A permanent magnet vacuum switch on a smart pole, its external structure is as follows figure 1 As shown, it includes a housing 3, and an inlet bushing 1 with silicone rubber insulation 2. Its internal structure is as figure 2 As shown, it includes: a zero-sequence current transformer 2 and a permanent magnet vacuum switch 5, and the zero-sequence current transformer 2 monitors the characteristic quantity of a single-phase ground fault in real time. The control unit receives the feature quantity of the single-phase ground fault, judges the location of the fault, and issues a shutdown command. The control unit used in this embodiment is a single-chip microcomputer or other intelligent computing and processing devices with signal reception, signal processing and sending control signals, such as Microcomputer et...

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Abstract

The invention discloses an intelligent pole-mounted permanent magnet vacuum switch, which includes a zero-sequence current transformer, a control unit, and a relay protection device. The zero-sequence current transformer monitors the characteristic quantity of a single-phase grounding fault in real time, and the control unit receives the The characteristic quantity of the single-phase ground fault, after judging the location of the fault, sends a closing command; the relay protection device receives the closing command and isolates the faulty line. The invention judges whether a single-phase ground fault occurs by detecting the characteristic quantity of the single-phase ground fault through an integrated high-precision monitoring unit, and overcomes the shortcomings of the external zero-sequence current transformer and voltage transformer.

Description

technical field [0001] The invention relates to a vacuum switch, in particular to a permanent magnet vacuum switch on an intelligent pole, which belongs to the field of power system protection and control. Background technique [0002] In the 10-35kV medium-voltage distribution network (hereinafter referred to as the distribution network), the neutral point generally adopts one of three methods: ungrounded, grounded through arc suppression coils and grounded through resistance. When a single-phase ground fault occurs in the distribution network, the fault current is small, so it is called a small current grounding system. Since the line voltage is still symmetrical, when a single-phase ground fault occurs in the distribution network, the distribution network can still run with the fault for 0.5 to 2 hours. [0003] However, due to a single-phase grounding fault, the non-fault phase-to-ground voltage rises (to the line voltage value when fully grounded), and the weak point o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/32
Inventor 陈俊武
Owner 威胜百楚电力科技有限公司
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