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过电压保护器安全隐患分析及改造
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作者 刘晓峰 《机械管理开发》 2015年第10期42-44,共3页
带火花间隙的组合式过电压保护器,由于有间隙的存在,无法做直流1mA下的电压U 1mA及0.75U1mA下的泄漏电流检测,只能做绝缘电阻与工频放电试验,也就不能从预防试验的角度来判断氧化锌阀片是否受潮或老化,给用户单位带来巨大隐患,就此提出... 带火花间隙的组合式过电压保护器,由于有间隙的存在,无法做直流1mA下的电压U 1mA及0.75U1mA下的泄漏电流检测,只能做绝缘电阻与工频放电试验,也就不能从预防试验的角度来判断氧化锌阀片是否受潮或老化,给用户单位带来巨大隐患,就此提出改造措施以保证运行平稳。 展开更多
关键词 放电间隙过电压保护器 老化 热崩溃
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煤矿高压开关过电压保护器安全管理技术研究
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作者 段晓波 《煤炭与化工》 CAS 2015年第7期51-53,共3页
针对带火花间隙的组合式过电压保护器发生故障的问题,分析论述其存在的固有问题,并提出以"六元件"结构替换"四星形"接法的改造措施。实践表明,改造措施有效降低了组合式过电压保护器事故发生率,确保了用电安全。
关键词 放电间隙过电压保护器 老化 热崩溃
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高压开关柜过电压保护器改造应用技术研究 被引量:1
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作者 曹海龙 《煤矿现代化》 2015年第6期98-99,共2页
带火花间隙的组合式过电压保护器,由于有间隙的存在,无法做直流1m A下的电压U1m A及0.75U1m A下的泄漏电流检测,只能做绝缘电阻与工频放电试验。也就不能从预防试验的角度来判断氧化锌阀片是否受潮或老化。只能等其发生事故后退出运行,... 带火花间隙的组合式过电压保护器,由于有间隙的存在,无法做直流1m A下的电压U1m A及0.75U1m A下的泄漏电流检测,只能做绝缘电阻与工频放电试验。也就不能从预防试验的角度来判断氧化锌阀片是否受潮或老化。只能等其发生事故后退出运行,给用户单位带来巨大隐患。 展开更多
关键词 放电间隙过电压保护器 老化 热崩溃
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一种功能性电刺激保护电路的设计与实现
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作者 王强 兰陟 +2 位作者 王丽 李宏亮 邢阳辉 《化工自动化及仪表》 CAS 2019年第2期121-124,共4页
在功能性电刺激保护电路中,创新性地设计了脉冲幅度调节电路和过电压放电电路,其特征在于,通过调节脉冲的幅度,改变电刺激的强度,电压和电路中反馈电压比较,当达到设定阈值时,放电电路放电,电路中的反馈电压通过放电电阻释放。放电电路... 在功能性电刺激保护电路中,创新性地设计了脉冲幅度调节电路和过电压放电电路,其特征在于,通过调节脉冲的幅度,改变电刺激的强度,电压和电路中反馈电压比较,当达到设定阈值时,放电电路放电,电路中的反馈电压通过放电电阻释放。放电电路直接通过硬件比较放电,不需要MCU判断,减轻了MCU的负担,提高了控制系统的可操作性和安全性。 展开更多
关键词 保护电路 功能性电刺激 脉冲幅度调节电路 过电压放电 硬件比较放电
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Study of partial discharge characteristics at repetitive square voltages based on UHF method 被引量:15
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作者 WANG Peng WU GuangNing +2 位作者 GAO Bo LUO Yang CAO KaiJiang 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第1期262-270,共9页
Due to overvoltage produced by inverter output,inverter-fed motor insulation systems often experience fast electrical aging process,especially when partial discharge(PD) is incepted.Before putting into use,the PD dete... Due to overvoltage produced by inverter output,inverter-fed motor insulation systems often experience fast electrical aging process,especially when partial discharge(PD) is incepted.Before putting into use,the PD detection should be performed on inverter-fed motors at repetitive square voltages to avoid the PD caused insulation deterioration when the motors are collected to inverters having specific characteristics.However,unlike PD tests at AC/DC voltages proposed in IEC 60270,the PD detection at repetitive square voltages is much more complex because of serious interference generated by impulse generator.To solve the problem,ultra-high frequency(UHF) method seems recommendable for its preferable signal-to-noise ratio(SNR).The chief aim of this study is to investigate PD pulse and statistical characteristics of turn-to-turn insulation for inverter-fed traction motors.A square-shaped Archimedes antenna,specially designed for the PD detection at repetitive square voltages of fast rise times,was used to perform PD tests on turn-to-turn insulation models.Time and frequency analysis results indicate that energy component of generator disturbance and PD pulses are mainly distributed in the 0-0.5 GHz and 0.6-1.5 GHz range,respectively.Based on the results,suitable filter was designed for power disturbance suppression.Additionally,resorting to the sensor unit(i.e.antenna and filter) and the PD test system,the PD statistical features at square voltages of different frequencies were obtained.Experimental results show that higher frequency will give rise,statistically,to PD of lower magnitudes distributing at smaller phases.A reasonable interpretation of this phenomenon was presented.Lastly,according to the PD statistical features,some suggestions for the PD detection system design,generator parameter optimization and the PD pulse extracting were given.The results of this work would be beneficial to the increase of the sensitivity when performing the PD detection on insulation systems for inverter-fed motors at repetitive square voltages and thus,improving the reliability of inverter-fed motors. 展开更多
关键词 inverter-fed motors insulation system partial discharge UHF square voltage ANTENNA FILTER
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