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

Active Publication Date: 2009-04-08
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +2
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  • Abstract
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Problems solved by technology

The circuit design is relatively complicated, and t

Method used

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  • Resistive current tester for great current zinc oxide lightning arrester
  • Resistive current tester for great current zinc oxide lightning arrester
  • Resistive current tester for great current zinc oxide lightning arrester

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Embodiment Construction

[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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Abstract

The invention provides a large-current ZnO arrester resistant current testing instrument, comprising a digital signal processor. A voltage channel is formed by the sequential cascading of a voltage sensor, a filter amplification circuit and an AD converter, a voltage signal is led out from a PT secondaly side by a voltage testing wire and is transmitted to the digital signal processor after processing; a current passage is formed by the sequential cascading of a current transmitter, a filter amplification circuit and an AD converter, a current signal is taken out from a discharging counter at the lower end of the arrester and is transmitted the current signal to the digital signal processor after processing. The current testing instrument has the advantages of high testing precision, convenient usage and safety and reliability.

Description

technical field [0001] The invention relates to an electrical parameter testing instrument, in particular to an instrument for measuring parameters such as resistive current and active power of a zinc oxide arrester under the condition of no power failure. Background technique [0002] According to Article 21 of the national standard GB50150-2006, the three main measurement items of zinc oxide arresters (hereinafter referred to as arresters) are: 1. Insulation resistance; 2. Power frequency reference voltage and continuous current; 3. DC reference voltage at 1mA and the leakage current under the DC reference voltage of 0.75, of which 1 and 3 are to remove the arrester for measurement after the power failure. Because the test labor intensity is too large, the time-consuming is too long, and it is a power failure measurement, the measurement cycle required by each region is very different. Long (generally 3 to 6 years / time). [0003] Chinese patent document CN87206423U disclo...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R19/25
Inventor 曾宏刘敬民许安刘凡
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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