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Online monitoring system for positioning faults of lightning arrester
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A kind of discharge counter hand-hold wireless data download apparatus
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Over-voltage and under-voltage protective circuit
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A kind of leakage current of an arrester turns 4 20mA signaling conversion circuits
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Power grid bus overcurrent detection method and system
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High-speed DC electronic fuse circuit
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High-speed response AC electronic safety circuit
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Lightning peak voltage waveform recording instrument
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Lightning arrester failure wireless transmission alarm device
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A kind of spark gap comprehensive parameters remote monitoring device
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Recorder for lighting peak current waveform of arrester
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Undervoltage protection circuit of three-phase power supply
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Surge overvoltage absorption circuit used for power device
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A kind of soft start DC power supply circuit
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Lower computer used for formaldehyde monitoring system
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Electric energy integrated monitor
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Smart mobile communication base station fault monitoring terminal
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Alternating-current soft start power supply device
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Four-way overvoltage recording device
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Novel phase breaking alarm apparatus
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