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Development of an opto-electrical probe for measuring impulse high-voltage across thyristors in HVDC valve of three-Gorges project

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4 Author(s)
Zhongyuan Zhao ; Nat. Lab. of Power Electron., Zhejiang Univ., Hangzhou, China ; Zhengyu Lu ; Yilei Gu ; Yuchang Qiu

A high-voltage resistive probe is developed to measure impulse voltage (1.2/50μs) distribution along thyristor units in HVDC converter valve with an optoelectronic system to transmit the measured signal. A pulse frequency modulation (PFM) mode is adopted for this transmitting system, owing to its immunity to high-intensity electromagnetic interference. Experimental results indicate that the undefined degree of the scale factor under lightning impulse for this measuring system is within ±1%, and therefore it can meet requirements specified by IEC60700-1.

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Applied Power Electronics Conference and Exposition, 2004. APEC '04. Nineteenth Annual IEEE  (Volume:3 )

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