A method for obtaining insulation polarization and depolarization current of electrical equipment
A technology of electrical equipment and acquisition method, applied in the direction of only measuring current, measuring current/voltage, measuring electrical variables, etc., can solve the problems of body capacitance charging and discharging current and external interference, and achieve the effect of strong anti-interference ability
Active Publication Date: 2020-05-19
HUAZHONG UNIV OF SCI & TECH
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[0005] Aiming at the defects of the prior art, the purpose of the present invention is to solve the technical problem that the method for obtaining the polarization and depolarization current of electrical equipment insulation in the prior art is susceptible to the charging and discharging current of the body capacitance and external interference
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[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0031] Such as figure 1 As shown, the AC power supply 1 and the DC power supply 2 are respectively connected in series with the first relay 3 and the second relay 4. After the two power supply branches are connected in parallel, one end is connected to the high voltage end 10 of the transformer 8 through the protection resistor 6, and the other end is connected to the high voltage end 10 of the transformer 8 through the ammeter. 5 is connected to the casing 9 of the transformer 8, and the casing 9 of the transformer 8 is grounded at the same time, and an anti-leakage ring 7 is installed on the bush...
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The invention discloses a method for obtaining the polarization and depolarization current of electrical equipment insulation. The method comprises the following steps that: alternating current voltage is applied to electrical equipment insulation, and current which flows through the steady state of the electrical equipment insulation is measured; according to the alternating current voltage and the current, the complex capacitance of the electrical equipment insulation is measured; direct current voltage is applied to the electrical equipment insulation, and current amplitude which flows through the steady state of the electrical equipment insulation is measured; according to the direct current voltage and the current amplitude, the direct current resistance of the electrical equipment insulation is calculated; and according to the complex capacitance and the direct current resistance of the electrical equipment insulation, the polarization and depolarization current is obtained. Thecomplex capacitance and the direct current resistance of the insulation are measured, since the complex capacitance and the direct current resistance are dielectric response characteristics under an insulation steady state, the complex capacitance and the direct current resistance are slightly affected by direct current and alternating current, and therefore, antijamming capability is high. By useof the method, in a process that the polarization and depolarization current is deduced on the basis of the complex capacitance and the direct current resistance of the insulation, the charging and discharging current of body capacitance is removed so as to be free from the influence of the charging and discharging current of body capacitance.
Description
technical field [0001] The invention belongs to the field of dielectric response diagnosis of electrical equipment insulation, and more specifically relates to a method for obtaining insulation polarization and depolarization current of electrical equipment. Background technique [0002] The dielectric response diagnosis method of electrical equipment insulation time domain, generally Polarization and Depolarization Current (PDC) method, as a non-destructive diagnostic method, is widely used in the diagnosis of insulation status of various electrical equipment Medium, such as power transformers, XLPE cables, high-voltage bushings, etc. The insulation diagnosis method based on PDC is based on the polarization and depolarization current of the electrical equipment insulation, extracts the parameters that can reflect the insulation state, and combines the existing research criteria to evaluate the insulation state. Therefore, obtaining accurate polarization and depolarization ...
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IPC IPC(8): G01R19/00G01R31/12
CPCG01R19/0092G01R31/12
Inventor 徐晴川林福昌李化涂静芸陶霰韬
Owner HUAZHONG UNIV OF SCI & TECH