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A synthetic voltage test power supply device with alternating current and direct current

A technology of power supply device and voltage test, which is applied in the direction of testing dielectric strength and improvement of basic electrical components, etc., and can solve problems such as no partial discharge-free power supply system

Active Publication Date: 2011-12-07
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, in the IEC and domestic converter test standards, the AC withstand voltage and DC withstand voltage are used to evaluate the insulation performance of the converter converter respectively. There are no relevant reports on the AC superimposed DC non-PD power supply system at home and abroad.

Method used

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  • A synthetic voltage test power supply device with alternating current and direct current
  • A synthetic voltage test power supply device with alternating current and direct current
  • A synthetic voltage test power supply device with alternating current and direct current

Examples

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Embodiment 1

[0036] The unit is currently undertaking the scientific and technological project of the State Grid Corporation of China "Research on the Main Insulation Characteristics of Oil-Paper Under the Condition of High-Voltage Direct Current", and the device developed by this invention has been successfully used in this project. And found many innovative research results that have not been reported at home and abroad.

[0037] Taking the breakdown characteristics of insulating oil under the pin plate condition by using the synthetic voltage test power supply device of alternating current superimposed direct current of the present invention as an example, the test layout is as follows image 3 As shown, it consists of a 0.1mm needle tip and a circular stainless steel plate with a diameter of 300mm.

[0038] exist image 3 Simultaneously apply AC and DC synthetic test voltages on the needle board model to measure the breakdown characteristics. During the test, a fixed AC voltage is ap...

Embodiment 2

[0042] see Figure 7 In the following, the application of the AC and DC power supply system of the present invention will be introduced by taking the experimental research of partial discharge under AC and DC voltages as an example. The three block diagrams in the figure are: frame figure 1 For the AC-DC power supply system, the AC-DC power supply system designed for the present invention, the principle diagram is as follows figure 1 Shown; box figure 2 Among them, Cx is the test sample, which is connected in parallel with the test power supply; image 3 The test measurement system is mainly composed of a voltage divider Ck and a detection impedance Zm. The detection impedance and the partial discharge detector are connected through a cable to realize partial discharge monitoring. The test object Cx is connected in parallel with the measurement system and then connected in parallel with the AC / DC power supply system, that is, the output voltage of the AC / DC power supply sy...

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Abstract

The invention provides a synthetic voltage test power supply device in which alternating current is superimposed on direct current. The output voltage can include pure AC voltage, pure DC voltage and the composite voltage of AC superimposed DC. The output AC component and DC component are independently adjustable, and the AC superimposed DC voltage waveform of different components can be output according to the needs. The technical solution of the invention is of great significance to the research on the mechanism of partial discharge under the mixed AC and DC field strength, the influence of the AC and DC components on the breakdown stress, and the selection of the validity of the stress in the converter transformer test.

Description

technical field [0001] The invention relates to the technical field of high voltage and insulation, in particular to a synthetic voltage test power supply device in which alternating current is superimposed on direct current. The output voltage can include pure AC voltage, pure DC voltage and the composite voltage of AC superimposed DC. The output AC component and DC component are independently adjustable, and the AC superimposed DC voltage waveform of different components can be output according to the needs. Background technique [0002] my country has become a major DC power transmission country in the world, and is building the "Yunnan-Guangdong" DC transmission project with the highest voltage level in the world, the "Xiangjiaba-Shanghai" ±800kV DC transmission project (the world's current highest is ±600kV), and DC-related projects , Research projects are getting more and more attention. Existing engineering experience and statistical results show that in HVDC transmi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R1/20
Inventor 李博李光范李金忠程涣超张书琦孙倩邓俊宇
Owner CHINA ELECTRIC POWER RES INST