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Control system for suppressing switching-on surge current of circuit breaker

A control system and circuit breaker technology, applied to high-voltage air circuit breakers, circuits, high-voltage/high-current switches, etc., to achieve the effect of suppressing the closing inrush current and improving the service life

Active Publication Date: 2021-01-01
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a control system for suppressing the closing surge of the circuit breaker in order to overcome the defect of the closing surge generated during the operation of the circuit breaker

Method used

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  • Control system for suppressing switching-on surge current of circuit breaker
  • Control system for suppressing switching-on surge current of circuit breaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a control system for suppressing the inrush current of a circuit breaker, and the control system includes a control module and a loop module;

[0030] The control module includes an I / O unit, a control unit, a conversion unit and a motor; the I / O unit receives and confirms the closing command signal of the circuit breaker, and then transmits it to the control unit after confirmation, and the control unit transmits the closing command signal to the circuit module , the loop module switches the corresponding loop in the loop module according to the operation instruction signal. After the switching is completed, the completion information is sent back to the control unit. The gate command signal provides digitally controlled voltage and current to the motor, and the motor completes the closing operation of the circuit breaker;

[0031] The circuit module is connected to the circuit where the circuit breaker is located.

[0032] The loop module inc...

Embodiment 2

[0043] This embodiment provides a control system for suppressing the closing inrush of a circuit breaker. On the basis of Embodiment 1, the control system further includes a vibration signal sensor, and the vibration signal sensor is used to detect dynamic and static arcing of the circuit breaker when closing The mechanical quantity parameters of the head, said parameters including contact stroke quantity, velocity quantity, vibration quantity and action time;

[0044] The vibration signal sensor is connected with the I / O unit of the control module, and transmits the detected parameters to the I / O unit of the control module, and the I / O unit records and stores the parameters.

[0045] The control system also includes a static arc contact compensation unit, and the static arc contact compensation unit is used to drive the static arc contact to move toward the moving arc contact, so as to realize the position compensation of the static arc contact;

[0046] The static arc contact ...

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PUM

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Abstract

The invention relates to a control system for suppressing switching-on surge current of a circuit breaker. The control system comprises a control module, a loop module, a vibration signal sensor and astatic arc contact compensation unit. When switching of the capacitor bank requires closing of the circuit breaker, the control module verifies and receives a closing instruction, firstly controls the loop module to be switched to the RL compensation loop to suppress an inrush current value and then controls the circuit breaker to be closed, and after closing is completed, the RL compensation loop is rapidly switched to an impedance-free loop. Besides, the vibration signal sensor collects parameters such as contact stroke amount, speed amount, vibration amount, action time and the like of thearc contact in the closing process and is matched with the static arc contact compensation unit to compensate contact stroke loss of the arc contact caused by inrush current ablation so as to avoid severe consequences caused by shortening of the contact stroke of the arc contact and advanced conduction of the main contact. The control system provided by the invention can effectively inhibit the switching-on inrush current, and prolongs the electrical life of the arc contact of the circuit breaker.

Description

technical field [0001] The invention relates to the technical field of high-voltage circuit breakers, and more specifically, to a control system for suppressing the closing surge of a circuit breaker. Background technique [0002] During the operation of the power system, due to the fluctuation of the grid load, it is necessary to adjust the reactive power of the system by frequently switching capacitor banks and shunt reactor banks. SF 6 Circuit breakers are often used to switch capacitor banks and shunt reactor banks. The high-frequency and high-amplitude inrush current generated during the closing process may reach tens of thousands of amperes, far exceeding the rated operating current of the circuit breaker. The high energy brought by the surge will severely ablate the SF 6 The special arcing contact of the circuit breaker causes the contact resistance of the arcing contact to increase and the contact stroke to become shorter. After ablation to a certain extent, the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H33/59H01H33/36H01H33/42
CPCH01H33/36H01H33/42H01H33/59
Inventor 陈邦发陈道品黄静何子兰陈思翔武利会刘益军李莉
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID