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An arc suppression and voltage limiting protection device for small current grounding system

A low-current grounding and voltage-limiting protection technology, used in emergency protection circuit devices, emergency protection circuit devices, circuit devices, etc. for limiting overcurrent/overvoltage, which can solve the problem of limited life of arc extinguishing devices and damage to vacuum contactors. and other problems to achieve the effect of reducing the formation of arcs and optimizing the structure

Active Publication Date: 2020-01-31
STATE GRID CORP OF CHINA +2
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited life of the arc extinguishing device, the vacuum contactor of this arc-extinguishing and voltage-limiting protection device is prone to damage due to frequent discharges during use.

Method used

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  • An arc suppression and voltage limiting protection device for small current grounding system
  • An arc suppression and voltage limiting protection device for small current grounding system
  • An arc suppression and voltage limiting protection device for small current grounding system

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Embodiment Construction

[0017] refer to Figure 1-3 , a specific embodiment of the present invention includes,

[0018] The intelligent controller 2 is used to monitor the phase voltage and zero-sequence voltage of the power supply system in real time. When a single-phase ground fault occurs in the power supply system, it controls the conduction and conduction rate of the active voltage regulation component 3 and switches the upper outlet cabinet The ground fault phase in the cable 4 is connected to the system ground 5 through the active voltage regulating component 3;

[0019] The active voltage regulating component 3 is used to adjust the phase-to-ground voltage of the fault, so that the phase voltage of the fault is lower than the insulation withstand voltage of the fault point, and eliminates the discharge of the fault point to the ground, so as to avoid the harm caused by the arc overvoltage to the operation of the power supply system, and After the fault point insulation is restored, it will a...

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Abstract

The invention discloses an arc-extinguishing voltage-limiting protection device for a low-current grounding system. The arc-extinguishing voltage-limiting protection device comprises an intelligent controller and an active voltage regulating assembly, wherein the active voltage regulating assembly is connected with a cable of an upper-level outgoing line cabinet by means of a vacuum contactor, thevacuum contactor comprises a shell body, a static contact is fixed to one end of the shell body, the other end of the shell body is axially connected with a movable contact, the outer side end of themovable contact is connected with the shell body by means of a first spring body, a first magnet is fixed to the outer side end of the movable contact, an electromagnet that is attracted with the first magnet is mounted in the shell body, and an inner side end of the movable contact is in selective contact with the static contact; and an arc-shaped baffle plate is fixed on the inner side of the shell body, and the static contact is arranged below the arc-shaped baffle plate. The arc-extinguishing voltage-limiting protection device can improve the deficiencies of the prior art and prolong theservice life of a vacuum contactor.

Description

technical field [0001] The invention relates to the technical field of arc suppression and voltage limiting protection devices, in particular to an arc suppression and voltage limiting protection device for small current grounding systems. Background technique [0002] At present, in our country, the 3-60kV power supply system commonly used by industrial and mining enterprises generally adopts a small current grounding system. There are two main ways to prevent arc overvoltage for small current grounding systems, namely, arc suppression coil and arc suppression cabinet; among them, arc suppression coil is the most widely used, and its working principle is: when a single-phase power grid occurs After a ground fault, provide a certain inductive current for the system, compensate the capacitive current of the system, reduce the ground current, and also make the recovery voltage speed at both ends of the arc decrease when the arc at the fault phase ground point is extinguished, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/08H02H9/04
CPCH02H9/041H02H9/08
Inventor 刘勇郜志卜明新岳国良杨海运苗靓武光华穆永保闫柯柯曹君芳李宏斌
Owner STATE GRID CORP OF CHINA
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