Heat pump type main-transformation heat-exchanging device with SF6 (sulfur hexafluoride) as heat-exchanging medium and heat-exchanging method

Abstract

The invention relates to a heat-pump-type main-transformation heat-exchanging device with SF6 (sulfur hexafluoride) as a heat-exchanging medium and a heat-exchanging method. The heat pump type main-transformation heat-exchanging device comprises an SF6 heat pump compressor, a cooler and an evaporator, wherein one port of the cooler is connected with one port of the SF6 medium flow passage of the evaporator through a bidirectional throttle valve; the other port of the SF6 medium flow passage of the evaporator and the other port of the cooler are connected with two ports of the SF6 heat pump compressor through a four-way valve; two ports of transformer oil flow passage of the evaporator are connected with an oil inlet and an oil outlet of the main-transformation body; transformer oil in the main-transformation body is conveyed into the oil inlet from the oil outlet through an oil pump; and the transformer oil exchanges heat with the SF6 heat-exchanging medium inside the SF6 medium flow passage directly through the side wall of the transformer oil flow passage of the evaporator. The heat pump type main-transformation heat-exchanging device has huge advantages of safety, reliability, high heat-exchanging efficiency, small equipment volume, low oil consumption, small maintenance, economical overall operation and the like, and is a revolutionary innovation of a main-transformation heat-exchanging way.

Description

technical field [0001] The present invention relates to a kind of SF 6 A heat pump type main heat conversion device and method for heat exchange medium. Background technique [0002] During the operation of the main transformer, due to the action of electricity and magnetism, its coil and iron core will generate heat. If the heat cannot be taken away in time, it will cause serious accidents such as burning or even explosion of the main transformer. The transformer oil flows to cool the coil and iron core, and the heat taken away by the transformer oil flow needs to be exchanged through the cooling device, and the cooled cold oil flow enters the main transformer body for cooling. Traditional main transformer cooling methods mainly include forced air cooling, natural air cooling and water cooling. Although water cooling is economical and efficient, if cooling water leaks into the main transformer in the cooling system, even if it is a small leak, It will lead to serious cons...

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Problems solved by technology

Traditional main transformer cooling methods mainly include forced air cooling, natural air cooling and water cooling. Although water cooling is economical and efficient, if cooling water leaks into the main transformer in the cooling system, even if it is a small leak, It will lead to serious consequences; due to the low heat enthalpy of the air, the cooling efficiency of the main transformer is low, the manufacturing volume of the main transformer and radiator equipment is large, the oil consumption is large, the operating cost is high, and the maintenance amount is large, etc.

[0003] The main transformer operating in the cold winter in the north, when it is in low load or cold standby or hot standby state, the transformer oil in the main transformer has high viscosity due to low temperature, is not easy to flow, and the insulation strength is reduced. When the load is rapidly increased, it is often too late to heat the oil to make it flow. At this time, it will cause a serious failure of the main transformer coil to be burned. Therefore, it is necessary to heat the main transformer oil to ensure safe use, or add anti-coagulation additives to the transformer oil Increase the fluidity of the oil, but the chemical composition of the additive will have an adverse effect on the electrical, insulating and physical and chemical properties of the transformer oil, and long-term use will threaten the safe operation of the main transformer

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