Unlock instant, AI-driven research and patent intelligence for your innovation.

Evaluation method for single-phase re-strike risk of AC filter group circuit breaker

A technology of AC filters and circuit breakers, which is applied in the direction of instruments, CAD circuit design, data processing applications, etc.

Active Publication Date: 2020-09-25
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during each switching process, due to the change of system parameters and working conditions, the electromagnetic energy conversion between the capacitor and the inductor is caused, resulting in internal overvoltage, so that after the ACF group circuit breaker is broken, its fracture is subjected to AC and DC mixed There is a probability of internal insulation failure due to the combined action of overvoltage

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Evaluation method for single-phase re-strike risk of AC filter group circuit breaker
  • Evaluation method for single-phase re-strike risk of AC filter group circuit breaker
  • Evaluation method for single-phase re-strike risk of AC filter group circuit breaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] The mechanism of overvoltage generation is as follows: when the circuit breaker disconnects the AC filter, the contacts begin to separate, and the contact pressure acting on the contacts begins to decrease, and the contact area also decreases, so the contact resistance and the heat released from the contacts just increase. Heat is concentrated in a small volume, and the metal is heated to high temperatures to melt, creating liquid metal bridges between the contacts. Eventually the metal bridge is pulled apart, forming a transitional or steady arc between the contacts. The arc is naturally extinguished when the current crosses zero.

[0020] Heavy strike through voltage: After the circuit breaker breaks the arc when the current crosses zero, if the switch recovery voltage and its rising speed are higher than the insulation strength of the port, the arc will break down the port in an instant, resulting in heavy breakdown. AC filter Capacitive, inductive components on th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an assessment method for a single-phase re-strike risk of a group circuit breaker of an alternating current filter. According to the method, first, a simulation model of a direct current system is established, then re-ignition of the circuit breaker is simulated in the simulation model, voltage waveforms of a resistor, a reactor and a capacitor are recorded at the same time, the level of the re-strike risk is judged according to the waveforms, and reference is provided for an insulation problem and risk harm of an ACF circuit breaker and equipment related to the ACF circuit breaker.

Description

technical field [0001] The invention relates to the technical field of high-voltage direct current transmission, in particular to a method for evaluating the risk of single-phase re-breakdown of an AC filter group circuit breaker. Background technique [0002] Generally, 8 to 22 AC filter (Alternating Current Filter, ACF) groups are installed in the converter station of the HVDC power transmission project to provide reactive power for the converter and filter out the AC harmonics generated by it. The ACF group circuit breaker is under the control of the reactive power control system of the converter station, and performs group switching to meet the reactive power demand in the operation of the converter station. However, during each switching process, due to the change of system parameters and working conditions, the electromagnetic energy conversion between the capacitor and the inductor is caused, resulting in internal overvoltage, so that after the ACF group circuit break...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/3308G06Q50/06
CPCG06F30/33G06Q50/06Y02E60/00
Inventor 陈伟民楚金伟张长虹黎卫国杨旭项鹏飞
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID