【摘要】：電流零區(qū)測量(CZM)系統(tǒng)可以用于評(píng)估斷路器的開斷能力,是電弧機(jī)理研究和產(chǎn)品開發(fā)、優(yōu)化的有用工具。首先介紹了零區(qū)測量系統(tǒng)的原理以及據(jù)此開發(fā)的零區(qū)測量系統(tǒng),該系統(tǒng)主要由高采樣頻率光纖隔離數(shù)采儀、分壓器、Rogowski線圈和采集控制及數(shù)據(jù)處理程序組成。定制的分壓器和Rogowski線圈經(jīng)過校驗(yàn)后,可分別用于測量電弧電壓和電流。隨后將該系統(tǒng)應(yīng)用于電壓等級(jí)為252 k V、額定短路電流為50 k A/60 Hz的SF_6斷路器的L90試驗(yàn)中,以獲取不同燃弧時(shí)間的的零區(qū)特性數(shù)據(jù)。測試結(jié)果表明:過零前200 ns時(shí)刻的電導(dǎo)、過零前電弧電壓下降率可以較好地表征SF_6斷路器的熱開斷能力;對于被試斷路器而言,過零前200 ns時(shí)刻的電導(dǎo)、過零前電弧電壓下降率的開斷臨界值分別為Glim≈1.4 m S,Plim≈2 850 V/μs。該測量系統(tǒng)可對斷路器開斷能力進(jìn)行定量測量和評(píng)定,將有助于提升高壓斷路器研發(fā)水平。
[Abstract]:The current zero range measurement (CZM) system can be used to evaluate the breaking capacity of circuit breakers. It is a useful tool for the research of arc mechanism and product development and optimization. Firstly, the principle of zero zone measurement system and the zero zone measurement system are introduced. The system is mainly composed of high sampling frequency optical fiber isolation digital collector, voltage divider, Rogowski coil, acquisition control and data processing program. The custom voltage divider and Rogowski coil can be used to measure arc voltage and current after calibration. Then the system is applied to the L90 test of SF_6 circuit breaker with a voltage level of 252kV and a rated short-circuit current of 50 Ka / 60 Hz to obtain the zero-range characteristic data of different arc burning time. The test results show that the thermal switching capacity of SF_6 circuit breakers can be well characterized by the conductance and the reduction rate of arc voltage at 200 ns before zero crossing. For the circuit breakers tested, the breaking critical values of the conductance at 200 ns before zero crossing and the voltage drop rate of the arc before zero crossing are Glim 鈮，

本文編號(hào)：2416955