Zero-phase current transformer for measuring three-phase four-wire live wire insulation resistance, and live wire insulation resistance measurement device

Abstract

Disclosed are a zero-phase current transformer for measuring a three-phase four-wire live wire insulation resistance, and a live wire insulation resistance measurement device. The present invention isimplemented through a process in which the live wire insulation resistance measurement device calculates a phase angle of each phase-specific voltage and a synthesis leakage current on the basis of each phase-specific voltage measurement value transmitted from the three-phase four-wire zero-phase current transformer and a synthesis leakage current measurement value of each phase-specific zero-phase current transmitted from the three-phase four-wire zero-phase current transformer, and calculates each phase-specific live wire insulation resistance value on the basis of the synthesized leakage current measurement value, the phase angle, and the phase-specific voltage measurement value. According to the present invention, the live wire insulation resistance measurement device can independently measure each phase-specific live wire insulation resistance from each phase-specific zero-phase current.

Description

Technical field [0001] The present invention relates to a three-phase four-wire zero-phase current transformer device for measuring live insulation resistance. More specifically, it relates to the following three-phase four-wire zero-phase current transformer device for live insulation resistance measurement. In the case of maintaining the live insulation resistance measurement device, the live insulation resistance measurement device is separated from the zero-phase current converter device to make it easier for workers to perform repair or maintenance work, and the live insulation resistance measurement device can be independent from the zero-phase current of each phase Measure the live insulation resistance of each phase. [0002] Furthermore, the present invention relates to a live insulation resistance measuring device, and more specifically, to a live insulation resistance measuring device that can independently measure the charged insulation resistance of each phase from th...

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Problems solved by technology

[0005] On the other hand, because most of the zero-phase current conversion devices only have passive components, there are almost no failures. On the contrary, because the live insulation resistance measurement device includes multiple electronic components, the failure frequency is relatively higher. The relationship between the integrated production of the power measurement device and the zero-phase current conversion device of the existing similar technology has a technical limitation that the efficiency of repair or maintenance work is very low

[0006] Moreover, the leakage current is divided into capacitive leakage current and resistive leakage current. If the human body touches the resistive leakage current and exceeds the specified amount, it will cause fatal damage or death to the human body and become the main cause of fire.

[0007] On the other hand, the live insulation resistance measurement device of the prior art used to prevent such accidents cannot independently measure the live insulation resistance of each phase, and this technical limitation has the technical limitation that the measurement accuracy of the leakage current cannot be guaranteed.

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