Method and device for online monitoring power station and substation grounding grid
A substation grounding grid and grounding grid technology, which is applied in the direction of grounding resistance measurement, fault location, etc., can solve the problems of inability to realize online monitoring, inconvenient regular detection, and heavy equipment, so as to achieve accurate measurement, improve precision, and overcome heavy workload. Effect
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[0022] Referring to Fig. 1, Fig. 1 is a structural diagram of an on-line monitoring device for a grounding grid of a power substation according to the present invention. The monitoring device includes a state sensor, a signal source, a control switch, a comparative amplifier, an operational amplifier 1, a power amplifier, an operational amplifier 2, an operational amplifier 3, an operational amplifier 4, a differential amplifier, a resistance measuring device, and a converter A / D 1 , Converter A / D 2 , Converter A / D 3 , Converter A / D 4 , single chip microcomputer, converter D / A 1 , Converter D / A 2 , filter, photoelectric switch. The signal source adopts a square wave generator with continuously adjustable amplitude and frequency. The comparison amplifier, power amplifier, sampling resistor, operational amplifier 2 and state sensor constitute the steady-state measurement part of the system. Operational amplifier 1, power amplifier, sampling resistor And the state sensor con...
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