Low voltage residual leak current measurement instrument and working method thereof

A leakage current and measuring instrument technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of unable to measure the phase relationship of three-phase lines, and unable to detect the amplitude and phase of leakage current in the circuit.

Inactive Publication Date: 2018-03-27
LISHUI POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the existing leakage current measurement method is to use a clamp meter to snap in all the lines, only to measure the leakage current value of the test line and its electrical equipment, and cannot

Method used

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  • Low voltage residual leak current measurement instrument and working method thereof

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Embodiment

[0023] Embodiment: a kind of low-voltage residual leakage current measuring instrument of this embodiment, such as figure 1 As shown, it includes a microprocessor 1, a power supply module, a current sampling device, an amplifying circuit 2, a display screen 3 and a wireless communication module 4, and the current sampling device includes four current transformers 5, and the four current transformers 5 are respectively used for collecting L1 line current, L2 line current, L3 line current, N line current in the three-phase line, the amplifying circuit 2 is electrically connected with the current transformer 5 and the microprocessor 1 respectively, and the microprocessor 1 is respectively connected with the power module and the display screen 3 It is electrically connected with the wireless communication module 4.

[0024] The power module includes a rechargeable battery 6, a charging control circuit 7, a USB interface 8, a DC-DC converter 9 and a switch 10, the USB interface 8 i...

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Abstract

The invention discloses a low voltage residual leak current measurement instrument and working method thereof. The measurement instrument includes a micro-processor, a power module, a current samplingdevice, an amplification circuit, a display screen and a wireless communication module. The current sampling device includes four current transformers used for collecting L1 line current, L2 line curre,t L3 line current and N line current in a three-phase circuit respectively. The amplification circuit is connected electrically to the current transformers and the microprocessor separately. The microprocessor is electrically connected with the power module, the display screen and the wireless communication module separately. According to the invention, actual current amplitudes of different lines in the three-phase circuit and the phase relation among the actual current amplitudes can be detected; also, leak current amplitude and phase can be determined.

Description

technical field [0001] The invention relates to the technical field of current detection, in particular to a low-voltage residual leakage current measuring instrument and a working method thereof. Background technique [0002] At present, the existing leakage current measurement method is to use a clamp meter to snap in all the lines, only to measure the leakage current value of the test line and its electrical equipment, and cannot measure the actual current amplitude in the three-phase line and the difference between them. The phase relationship is measured, and the magnitude and phase of the leakage current in the circuit cannot be detected. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides a low-voltage residual leakage current measuring instrument and its working method, which can detect the actual current amplitude of each line in a three-phase line and the phase relationship between them, and can also d...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R19/25
CPCG01R19/25G01R31/50
Inventor 刘洪涛杨劭炜钟鸣王江海李沐红吴剑金潇雷娜钦冰李京润
Owner LISHUI POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER
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