Switching overvoltage suppression device

A technology for operating overvoltage and suppressing devices, applied in circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc., can solve resistance damage, resistance heating speed too fast, resistance overheating Explosion and other problems, to achieve the effect of preventing injury and preventing the influence of heat

Active Publication Date: 2014-12-24
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the vibration generated in the transmission line is large, it is easy to use a closing resistor and a circuit breaker to cause the resistance to heat too fast when the circuit breaker is closing, resulting in damage to the resistance, and the main switch cannot be activated in the closing circuit in time. Closed after closing, it is easy to cause the resistor to overheat and explode
Therefore, there are still defects in the opening and closing system, which affects the stability and reliability of the EHV transmission system in the long-term transmission operation

Method used

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  • Switching overvoltage suppression device
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Embodiment Construction

[0013] The operating overvoltage suppression device includes a main switch circuit, a closing damping circuit and a voltage equalizing circuit. The main switching circuit is connected in parallel with the closing damping circuit and the voltage equalizing circuit. The closing resistor 1, closing switch 1, closing resistor 2 and closing switch 2, the voltage equalizing circuit adopts the voltage equalizing capacitor 1 and the voltage equalizing capacitor 2 in series, or adopts the RC voltage equalizing circuit 1 and RC equalizing circuit in series Circuit 2, the connection between the first voltage equalizing capacitor and the second equalizing capacitor in series, or the connection between the first RC voltage equalizing circuit and the second RC voltage equalizing circuit connected in series with the connection between the first closing switch and the second closing resistor .

[0014] The closing resistor is mainly used to weaken the electromagnetic oscillation and limit the...

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Abstract

The invention provides a switching overvoltage suppression device. The device comprises a main switch circuit, a closing damping circuit and a voltage sharing circuit; the main switch circuit is connected in parallel with the closing damping circuit and the voltage sharing circuit. The device is characterized in that a protecting circuit is also connected in parallel for protecting from overvoltage; a sampling unit and a transmission unit are arranged to sample and transmit data. According to the switching overvoltage suppression device, a multi-closing switch structure is adopted to reliably prevent the influence caused by the heating of single closing switch; a parallel connecting protecting device is adopted to prevent the device from being damaged by overvoltage; a monitoring device is adopted to monitor the suppression device and confirm the working state of the suppression device; therefore, the device has the reliability and stability for ensuring long-term running.

Description

technical field [0001] The invention relates to an overvoltage suppression device for an ultra-high voltage system, in particular to an operation overvoltage suppressor. Background technique [0002] In the ultra-high voltage system, the overvoltage caused by the internal reasons of the power system is called internal overvoltage. This is because there are electric field inertial elements (capacitors) and magnetic field inertial elements (inductance) in the power system. When the circuit breaker is operated (including normal operation and accident operation), the power system will transition from one stable state to another. In a stable state, the electromagnetic field energy in the system components needs to be redistributed. This is an oscillation process. When the system parameters are improperly matched, a high overvoltage will appear. Internal overvoltage includes two types, transient overvoltage and operating overvoltage. Since most high-voltage transmission lines hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
Inventor 王超齐征丁华伟杨峰高立飞
Owner STATE GRID CORP OF CHINA
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