Resistive current tester for great current zinc oxide lightning arrester
A resistive current and arrester technology, applied in the field of electrical parameter testing instruments, can solve the problems of complex circuit design and the need to improve measurement accuracy, and achieve the effects of stable and reliable equipment, reduced hardware overhead, and low failure rate
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[0016] Fig. 1 shows, high-current zinc oxide surge arrester resistive current tester 1 (in Fig. 2, high-voltage busbar 2), comprises, digital signal processor; By filter amplifying circuit, AD converter cascaded successively to form voltage channel, from The voltage signal is drawn out from the secondary side of the PT through the voltage test lines 7 and 8, and then sent to the digital signal processor after processing; the current channel is composed of a current transmitter, a filter amplifier circuit, and an AD converter in series, and the current channel is connected from A to B The discharge counters 3a, 4a, 5a at the lower end of the lightning arresters 3, 4, and 5 on the C three-phase line take out the current signal and send it to the digital signal processor after processing. The model of the digital signal processor is 80C196KC20. The AD converter is a 10-bit parallel chip C196KC; it also has a TFT true-color liquid crystal display connected with a digital signal pr...
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