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IGBT (insulated gate bipolar transistor) series connection based high-voltage pulse superposition direct-current electric field generator

A high-voltage pulse and DC electric field technology, which is applied in the field of high-voltage pulse superimposed DC electric field generators, can solve problems such as inability to move directionally, difficult to remove, and unable to remove colloidal impurities, and achieve the effects of avoiding electromagnetic interference, fast response speed, and compact structure

Active Publication Date: 2014-01-22
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, people have also found that the electrostatic oil purification method also has certain defects, that is, it cannot remove the colloidal impurities dissolved in the oil.
This colloidal impurity is adsorbed around the oil molecules and cannot move directionally under the action of a high-voltage direct current electric field, making it difficult to be removed

Method used

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  • IGBT (insulated gate bipolar transistor) series connection based high-voltage pulse superposition direct-current electric field generator
  • IGBT (insulated gate bipolar transistor) series connection based high-voltage pulse superposition direct-current electric field generator
  • IGBT (insulated gate bipolar transistor) series connection based high-voltage pulse superposition direct-current electric field generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as Figure 1~3 As shown, a high-voltage pulse superimposed DC electric field generator based on IGBT series, including a power supply system 1, a bipolar high-voltage pulse forming system 2, a DC steep pulse superposition circuit 3, a signal conversion system 4, a synchronous trigger module 5 and a load 6 , and several IGBT single-tube modules.

[0039] The power supply system 1 includes a commercial power supply 1-1, and a high-voltage direct current module 1-2, a bipolar high-voltage direct current module 1-3 and a switching power supply 1-4 powered by the commercial power supply 1-1. The high-voltage direct current module is adjustable in output DC 0-20000V, the output current is 1mA, and has the function of voltage limiting protection; the bipolar high-voltage direct current module 1-3 generates and outputs a path no higher than +12kV through the positive polarity output terminal At the same time, generate and output a high-voltage direct current not higher th...

Embodiment 2

[0056] Such as Figure 1~3 As shown, a high-voltage pulse superimposed DC electric field generator based on IGBT series, including a power supply system 1, a bipolar high-voltage pulse forming system 2, a DC steep pulse superposition circuit 3, a signal conversion system 4, a synchronous trigger module 5 and a load 6 , and several IGBT single-tube modules.

[0057] The power supply system 1 includes a commercial power supply 1-1, and a high-voltage direct current module 1-2, a bipolar high-voltage direct current module 1-3 and a switching power supply 1-4 powered by the commercial power supply 1-1. The high-voltage direct current module is adjustable in output DC 0-20000V, the output current is 1mA, and has the function of voltage limiting protection; the bipolar high-voltage direct current module 1-3 generates and outputs a path no higher than +12kV through the positive polarity output terminal At the same time, generate and output a high-voltage direct current not higher th...

Embodiment 3

[0075] In this embodiment, the load 6 includes a cavity for containing the aged transformer oil. There are two polar plates immersed in the aged transformer oil in the cavity. The D terminal of the resistor II R4 is connected to one of the polar plates, and the other The plate is grounded. Using the ±10kV (bipolar steep pulse) + 20kV (DC) composite voltage obtained in Example 2 to input the load 6 will generate a DC steep pulse composite electric field in the cavity between the positive and negative plates of the aforementioned load 6 . While the DC electric field is treating the general impurity particles in the deteriorated transformer oil, the colloidal impurity particles detached from the oil molecules due to the action of the bipolar steep pulse electric field will also move to the plates on both sides under the action of the DC electric field after being charged. In this way, while purifying general impurity particles, the purification effect on degraded transformer oil ...

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Abstract

The invention provides an IGBT series connection based high-voltage pulse superposition direct-current electric field generator. The generator generates bipolar high-voltage pulse through an IGBT single-tube series circuit, and superposes high-voltage direct current on the basis of the bipolar high-voltage pulse generated by the IGBT single-tube series circuit; and compound voltage generated by the IGBT series connection based high-voltage pulse superposition direct-current electric field generator acts on an oil purifying device provided with a positive plate and a negative plate, and then, a direct-current steep pulse compound electric field is generated between the positive plate and the negative plate. Abundant frequency components of the bipolar steep pulse electric field can act on various colloid impurity particles, so that the particles perform reciprocating movement to be separated from oil molecules, then, the particles perform directional movement under the action of the high-voltage direct-current electric field and are absorbed on the polar plates, and accordingly, degraded transformer oil is purified.

Description

technical field [0001] The invention relates to the technical field of pulse power, in particular to a high voltage pulse superimposed DC electric field generator based on IGBT series connection. Background technique [0002] Transformer oil is an important insulation and heat dissipation medium in transformers, and plays an important role in the safe operation of transformers. However, impurities will inevitably be mixed in during the production, storage, transportation, and installation of transformer oil, and after long-term operation of the transformer, it will age under the action of electricity, light, heat, and chemical factors, resulting in a large number of impurity particles, including Metal particles, decomposed gas in oil, colloids and fibers, etc. affect the performance of transformer oil. [0003] Traditional methods of purifying transformer oil, such as pressure oil filter filtration, adsorption filtration, and vacuum filtration, have limited purification eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M9/04
Inventor 米彦姚陈果李成祥周龙翔张晏源廖瑞金李剑
Owner CHONGQING UNIV
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