Grounding impedance measuring device and method of operation thereof
A grounding impedance and measuring device technology, which is applied in the direction of grounding resistance measurement, etc., can solve the problems of inability to accurately detect grounding impedance Rg, inability to detect grounding impedance Rg with small impedance values, electric shock to the human body, etc.
Active Publication Date: 2019-05-17
DELTA ELECTRONICS INC
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Problems solved by technology
[0005] 1. It is impossible to accurately detect the size of the grounding impedance Rg: because the existing method is to use the waveform of the output terminal Pa to judge the grounding impedance Rg condition of the AC power supply end, therefore, for the square wave with the same duty cycle The signal can determine that the grounding impedance Rg is a short circuit, however, for waveforms with irregular output amplitudes, it is impossible to accurately determine the degree of the grounding impedance Rg;
[0006] 2. It is impossible to detect the grounding impedance Rg with a small impedance value: since most of the existing methods can only detect the grounding impedance Rg above 50KΩ or 200KΩ, once the impedance value of the grounding impedance Rg is low, it will cause detection serious errors; and
[0007] 3. The leakage current flowing back to the ground wire is large, which may easily cause electric shock to the human body and damage to electrical equipment
Method used
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[0060] Hereby, the technical content and detailed description of the present invention are described as follows in conjunction with the drawings:
[0061] see image 3 It is a schematic circuit block diagram of the grounding impedance measuring device of the present invention. The ground impedance measuring device is used for measuring the magnitude of a ground impedance Rg between an equipment ground point PE and a power supply ground point PEs. The grounding impedance measuring device is electrically connected to an equipment input terminal Sc corresponding to a phase sequence of the AC power supply terminal Ss. In other words, when the AC power supply is a three-phase four-wire system, the AC power terminal Ss has three live wires Ls1-Ls3 and a neutral wire Ns, and the input terminal Sc of the device is also provided with three live wires Lc1-Lc3 and a neutral wire correspondingly. Sexual line Nc. Similarly, when the AC power supply is a three-phase three-wire system, th...
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The present invention discloses a grounding impedance measurement device and an operation method thereof. The grounding impedance of the alternating current power supply end of the grounding impedance measurement device is electrically connected with the input end of a device providing an alternating current power supply. The grounding impedance measurement device comprises a direct current power supply generation circuit and a direct current voltage detection circuit. The direct current power supply generation circuit receives the alternating current power supply and is converted to a direct current power supply. The direct current power supply allows the two ends of the grounding impedance to generate a direct current impedance voltage. Because the sum of the direct current compositions of an alternating current power supply loop is zero, the direct current voltage detection circuit measures the direct current voltage difference between the input end of the device and the grounding point of a device, namely the difference between the input end of the device and the grounding point of the device is equal to the direct current impedance voltage, so that the size of the grounding impedance is calculated and detected.
Description
technical field [0001] The invention relates to a grounding impedance measuring device and an operating method thereof, in particular to a grounding impedance measuring device applied to an AC power supply end and an operating method thereof. Background technique [0002] Among the current international regulations or standards for electric vehicles, including their charging stations, the UL 2231-1 standard mainly focuses on the relevant specifications for personnel protection. Its scope of application lies in compliance with the general specifications of electric vehicle charging lines required by the NEC to prevent personnel from being exposed to electric shock hazards. [0003] Furthermore, in terms of expanding the scope of application, in the application of power distribution systems, all exposed and conductive parts of electrical equipment are usually connected through PE protection lines to form a complete equipotential bonding system. Moreover, the magnitude of the ...
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IPC IPC(8): G01R27/20
Inventor吴宗原
OwnerDELTA ELECTRONICS INC