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Power frequency parallel resonance withstand voltage test method based on incomplete compensation

A technology of withstand voltage test and parallel connection, which is applied in the direction of testing dielectric strength, measuring devices, instruments, etc., can solve the problems of increased insulation of excitation transformers, inconvenient manufacturing and on-site transportation, and low reliability, so as to save compensation capacitors , reduce volume and weight, and reduce difficulty

Active Publication Date: 2019-03-26
山西浩宇龙晟电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, the excitation transformer needs to output a higher test voltage, resulting in a large increase in the insulation of the excitation transformer, which is inconvenient for manufacturing and on-site transportation.
In addition, there is also a method of using power frequency parallel resonance withstand voltage test. The power frequency step-up transformer is smaller in mass and volume than the variable frequency excitation transformer, but it needs to add an additional parallel compensation capacitor to realize the inductive reactance in the entire circuit. Accurate compensation for capacitive reactance
The device requires high precision, so the structure is relatively complicated and the reliability is not high.

Method used

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  • Power frequency parallel resonance withstand voltage test method based on incomplete compensation
  • Power frequency parallel resonance withstand voltage test method based on incomplete compensation
  • Power frequency parallel resonance withstand voltage test method based on incomplete compensation

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Experimental program
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Effect test

Embodiment 1

[0029] Power frequency parallel resonance withstand voltage test method based on non-full compensation, including:

[0030] Step 1, establish a withstand voltage test model based on non-fully compensated power frequency parallel resonance; figure 1 As shown, the withstand voltage test model includes a power frequency test power supply, a power frequency step-up transformer, a compensating reactor and the tested product. The power frequency test power supply is connected to the low voltage end of the power frequency step-up transformer, and the tested product is connected The compensation reactor is connected to the high voltage end of the power frequency step-up transformer.

[0031] Step 2, compare the capacitive current value I flowing on the tested product in the withstand voltage test model C And the rated output current value I of the high voltage end of the power frequency step-up transformer in the withstand voltage test model 2 ; if I C greater than I 2 , when cal...

Embodiment 2

[0038] In order to verify the practicability and effectiveness of the power frequency parallel resonance withstand voltage test method based on non-full compensation, a corresponding circuit model is established in this paper. The specific circuit parameters are as follows: tested product (30kV, capacitance 0.0222μF), power frequency step-up transformer (50kV, 0.01A, transformation ratio 250:1, high-voltage side coil resistance 23kΩ, weight 25kg), reactor (40kV per section , 1.5A, inductance 76H, resistance 400Ω, weight 38kg) a total of five sections, requiring 21.75kV, 5min AC withstand voltage test on the tested product.

[0039] The first step is to calculate the capacitive current value flowing through the tested product at power frequency AC withstand voltage:

[0040] I C =ωC x U=2×π×50×0.0222×10 -6 ×21.75×10 3 = 0.1517A is far greater than the rated output current 0.01A of the high voltage side of the power frequency step-up transformer, so a parallel compensating r...

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Abstract

The invention discloses a power frequency parallel resonance withstand voltage test method based on incomplete compensation. The method comprises the steps of (1) establishing a withstand voltage testmodel of power frequency parallel resonance based on incomplete compensation, (2) comparing the value IC of capacitive current flowing through a tested product in the withstand voltage test model anda rated output current value I2 of a high voltage end of a power frequency step-up transformer in the withstand voltage test model, calculating an inductance Lq of a compensating reactor which needsto be connected to two ends of the tested product in parallel in full compensation if IC is larger than I2, connecting two ends of the tested product with the compensating reactor in parallel to perform compensation, executing step (3), and performing a withstand voltage test if IC is less than or equal to I2. According to the method, the capacity requirements for the power frequency step-up transformer and a field power frequency test power supply are greatly reduced, and the volume and weight of the power frequency step-up transformer are reduced.

Description

technical field [0001] The invention relates to a resonance withstand voltage test method of a power system, in particular to a power frequency parallel resonance withstand voltage test method based on non-full compensation. Background technique [0002] At present, in the power system distribution network, medium and low voltage power cables of 35kV and below, and power transformers of 35kV and below are widely used. According to the requirements of GB50150-2016 "Electrical Equipment Installation Engineering Handover Test Standard for Electrical Equipment", medium and low voltage power cables, transformers and other equipment must be tested for AC withstand voltage before they are put into operation. Among them, the medium and low voltage power cables of 35kV and below must be 2U in the frequency range of 20~300Hz. 0 AC withstand voltage test for up to 60 minutes; and power transformers of 35kV and below must be subjected to an AC withstand voltage test of up to 68kV for 1...

Claims

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1227
Inventor 汪锐
Owner 山西浩宇龙晟电子科技有限公司
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