新型过电压保护装置:BOD触发晶闸管阀

首先分析了过电流试验装置的原理及其故障过电压的机理、危害和特点.针对已有过电压保护方式(间隙和氧化锌避雷器)的缺点,提出了一种适合于频繁动作、动作电压准确性及稳定性高,动作电压调节方便、保护动作迅速、残压小,泄放能量大的新型过电压保护方式,即击穿二极管(Break Over Diode,BOD)触发晶闸管阀,并给出了BOD触发晶闸管阀的原理和设计要点及其特点.仿真分析和试验结果均验证了该保护装置的有效性和实用性.

A Novel Overvoltage Protection Approach Using Thyristor Valve Triggered by Breakdown Diode for Overcurrent Test Equipment

Firstly the principle of overcurrent test equipment and the forming mechanism,harm and features of its fault overvoltage are analyzed.According to the defects of existing overvoltage protection modes,e.g.,discharging gap and ZnO arrester,a novel type of overvoltage protection approach,i.e.,thyristor valve triggered by breakdown diode(BOD),is proposed.The proposed approach possesses following advantages: suitable to frequent action;accurate and stable action voltage that is easy to adjust,fast response speed,low residual voltage and high blowout capacity.The principle of triggering thyristor valve by BOD,its design highlights and features are analyzed.Both simulation and testing results show that the proposed protection approach is effective and practicable.