电子式电流互感器低压侧电路的多功能化实现

电子式电流互感器(ECT)低压侧电路是与继电保护设备接口的关键环节.文中对有源ECT的低压侧电路进行设计,实现了模拟量输出和基于数字信号处理器(DSP)的数字量输出,并利用DSP强大的数据处理能力,实现了ECT就地频率测量和谐波分析等功能;研究并实现了ECT快速校验算法,嵌入DSP的校验模块使得ECT能够完成就地校验;最后对设计的各功能模块进行了实测.低压侧电路的模块化、多功能实现将极大地拓展其应用范围.

Multifunctional Realization of Low-voltage Circuit of the Electronic Current Transformer

The low-voltage circuit is the key interfacing part between the electronic current transformer (ECT) and the relay and protection equipment. Specially designed, it has realized the analog output and the digital output based on the digital signal processor (DSP), whilst the frequency measurement and harmonic analysis can also be achieved owing to the powerful processing capability of DSP. The calibrating method of ECT is studied, and the calibration module is then embedded in the DSP system, thus implementing the on-the-spot calibration. All the functions have been tested and verified using the fast ECT checking algorithm. The application field of ECT can be expanded by virtue of the modularization and implementation of multifunction of the low-voltage circuit.