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Mining high-voltage inverter

A high-voltage frequency converter, mine-used technology, applied in the direction of output power conversion devices, electrical components, cooling/ventilation/heating transformation, etc., can solve the problems of ignoring comprehensive performance improvement, frequency converter winding wire or power unit failure, and resistance to partial discharge Problems such as low ability

Active Publication Date: 2014-04-30
江苏中联电气股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Typically, a standard winding wire consists of a wire of conductive material, usually copper, coated with one or more layers of a high temperature resistant polyesterimide (PEI) type and / or polyamideimide (PAI) type varnish ( i.e. varnishes), but such varnishes often result in poor partial discharge resistance
[0008] In addition, in the prior art, it is often only focused on the improvement of one aspect of the heat dissipation performance of the high-voltage inverter or the high-temperature resistance of the winding wire, while ignoring the improvement of the comprehensive performance of the two.
Further, even for the improvement of heat dissipation performance, the heat dissipation device conventionally used in this field is used to dissipate heat, and the heat dissipation effect is limited, and the characteristics of instantaneous heat accumulation in the flameproof box are not considered, and only from the aspect of improving the heat dissipation effect. Therefore, even for heat dissipation devices with strong heat dissipation performance, sometimes the inverter winding wire or power unit fails due to the instantaneous heat not being dissipated in time
In addition, commonly used polyesterimide (PEI) and / or polyamideimide (PAI) type varnishes also tend to result in low partial discharge resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Pipeline connection of the cooling circulation system of the mine-used high-voltage frequency converter

[0034] refer to figure 1 , one or more radiators provided in the explosion-proof box 100 of the multi-winding phase-shifting rectifier transformer unit are connected to the explosion-proof box 300 of the cooling cycle system; one or more radiators arranged in the explosion-proof box 200 of the power unit The radiator is also connected with the explosion-proof box 300 of the cooling circulation system; one or more radiators provided in the explosion-proof box 100 of the multi-winding phase-shifting rectifier transformer unit are connected with one of the power unit explosion-proof boxes 200. or multiple radiators are connected; the cooling circulation system explosion-proof box 300 and one or more radiators provided in the multi-winding phase-shifting rectifier transformer unit explosion-proof box 100, one or more radiators set in the power unit explosion...

Embodiment 2

[0035] Example 2: Radiator of mine-used high-voltage frequency converter

[0036] refer to Figure 2-4 , the radiator has a cooling frame, the cooling frame includes a plurality of cooling plates 21 and metal plates 20, each cooling plate 21 has an outer end 19, the metal plate 20 is close to the outer end of the plurality of cooling plates 21 The outer end portions 19 are connected together by means of a portion 19, so that an inner peripheral surface is formed by the plurality of cooling plates 21 and a metal plate 20, wherein the plurality of cooling plates 21 are located in the inner peripheral surface, so The inner peripheral surface allows the flow of the external ambient air cooling medium therethrough. The cooling device communicates with the high-voltage frequency converter 22 through a pipeline 23 .

Embodiment 3

[0037] Embodiment 3: the preparation of insulating varnish

[0038] In an oil bath, a mixture of 70 g of 4,4'-diphenylmethane bismaleimide, 30 g, o'-diallyl bisphenol F and 67 g of triallyl isocyanate was heated to 130 °C to It was completely solvent and kept at 130° C. for 25 minutes to obtain a prepolymer. The prepolymer was cooled to 80°C, the viscosity of the prepolymer was 1 poise, the prepolymer was coated on the winding wire by wire coating equipment and heated at 120°C for 5 hours, followed by heating at 200°C for 3 hours. hours and heated at 230° C. for 3 hours to obtain a light reddish-brown transparent resin layer. After testing, the resin layer has a glass transition temperature (representing physical heat resistance) greater than 300° C. and a chemical heat resistance of 15 days.

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Abstract

The invention relates to a mining high-voltage inverter. The mining high-voltage inverter comprises one or more multi-winding phase shifting rectifier transformer units, one or more explosion suppression boxes matched with the transformer units, one or more power units, one or more explosion suppression boxes matched with the power units, one or more cooling circulating systems, one or more explosion suppression boxes matched with the cooling circulating systems, and one or more radiators. The one or more multi-winding phase shifting rectifier transformer units and one or more radiators are arranged in the multi-winding phase shifting rectifier transformer unit explosion suppression boxes. A plurality of sets of power units which are connected in series, one or more control units and one or more radiators are arranged in the power unit explosion suppression boxes. The cooling circulating systems and one or more control units are arranged on the cooling circulating system explosion suppression boxes. Each radiator is provided with a cooling plate and a main metal plate which are respectively of a specific structure, so that each radiator has the good radiation performance. Each winding wire is coated with non-solvent-type insulating paint with excellent performance, and therefore the comprehensive high-temperature resistance of the mining high-voltage inverter is further improved.

Description

technical field [0001] The invention relates to a mining high-voltage frequency converter, more particularly, a mining high-voltage frequency converter with comprehensively improved heat dissipation performance and explosion-proof performance. Background technique [0002] In high-risk situations such as coal mines, high-power electric motors are often required today. However, the power factor of the high-power motor during starting is very low, and the voltage fluctuation is obvious, which will cause great harm to the power grid. This type of damage will reduce the operating efficiency of other electrical equipment on the grid and reduce the service life of the equipment; secondly, when transient voltages occur, it will cause the motor to generate vibration, noise, and excessive heat. Similarly, the surge generated by the transient will seriously reduce the power efficiency of the grid and increase the current loss of the inductive load. The continuous accumulation of hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H05K7/20
Inventor 刘汉顺苏成勇陈定忠仇成林徐卫东孙霆
Owner 江苏中联电气股份有限公司