Stray current suppression method in split phase cable dielectric loss measurement
A stray current and loss measurement technology, applied in the direction of measuring current/voltage, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve the problem of large measurement results and achieve the effect of reducing errors
Active Publication Date: 2019-02-22
ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +2
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Dielectric loss is mainly reflected by the main insulation leakage current, but in actual measurement, the distributed stray leakage current caused by the multi-layer structure of the cable will cause superimposed benefits to the main insulation leakage current, resulting in a larger measurement result
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[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0017] A stray current suppression method (applicable to phase-splitting cables) in the dielectric loss measurement of split-phase cables, comprising the following steps
[0018] Step 1. Build a cable dielectric loss test circuit (such as figure 1 Shown), apply a voltage U on the test circuit.
[0019] The present invention first constructs as figure 1 The shown cable dielectric loss test circuit is based on the existing test circuit, and the three-phase cables are connected in parallel to suppress the stray current.
[0020] Step 2. Measure the leakage current I of phase A cable at the head end of the split-phase cable A1 , the leakage current I of phase B cable B1 and C-phase cable leakage current I C1 ;
[0021] Step 3. Electrically connect the first ends of the AB, AC, and BC phase cables respectively, and measure the phase-to-phase leakage current ...
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The invention relates to a stray current suppression method in split phase cable dielectric loss measurement. The method comprises the following steps of applying a voltage U to a test loop; measuringthe leakage current IA1of an A-phase cable at the head end of a split phase cable, the leakage current IB1 of a B-phase cable, and the leakage current IC1 of a C-phase cable; electrically connectingthe head ends of AB, AC, and BC phase cables, and measuring phase-to-phase leakage currents IAB1, IAC1, and IBC1; measuring the leakage currents IA2, IB2 and IC2 of a three-phase cable at a tail end;electrically connecting the tail ends of the AB, AC, and BC phase cables, and measuring the phase-to-phase leakage currents IAB2, IAC2, and IBC2; and calculating the dielectric loss value of each phase. In the invention, the suppression function of the stray current of a split phase cable in dielectric loss measurement can be realized, the head end leakage currents and the tail end leakage currents are measured separately to calculate the dielectric loss value of each phase. The error of a measurement result caused by the distributed stray leakage current along the cable can be effectively reduced and the dielectric loss of the main insulation of the cable can be accurately reflected.
Description
technical field [0001] The invention belongs to the technical field of high-voltage electrical tests, in particular to a method for suppressing stray currents in the dielectric loss measurement of phase-splitting cables. Background technique [0002] Dielectric loss measurement is a test method to evaluate the operating state of electrical equipment. However, for power cables, due to the large cable capacitance and long line length, the distribution characteristics of electrical parameters are significant. Due to the distribution of electrical parameters, there will be errors in the dielectric loss measurement. The source of the errors is mainly the leakage current caused by the distributed effect of capacitance along the cable. Since the dielectric loss is mainly reflected by the main insulation leakage current, in actual measurement, the distributed stray leakage current caused by the multi-layer structure of the cable will cause superimposed benefits to the main insulati...
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IPC IPC(8): G01R27/26G01R19/00
CPCG01R19/00G01R27/26
Inventor 王浩鸣李季房晟辰宋鹏先李旭朱明正于洋孟峥峥李琳林国洲胡泉伟
Owner ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO