CN203706797U - Heat pump type main transformer heat exchange device with SF6 medium as heat exchange medium - Google Patents

Abstract

The utility model relates to a heat pump type main transformer heat exchange device with an SF6 medium as the heat exchange medium. The heat pump type main transformer heat exchange device comprises an SF6 heat pump compressor, a cooler and an evaporator. One port of the cooler is connected with one port of an SF6 medium flow path of the evaporator through a two-way throttle valve. The other port of the SF6 medium flow path of the evaporator and the other port of the cooler are connected with the two ports of the SF6 heat pump compressor through a four-way valve. The two ports of a transformer oil flow path of the evaporator are connected with an oil inlet and an oil outlet of a main transformer body respectively. Transformer oil in the main transformer body is conveyed from the oil outlet to the oil inlet through an oil pump. The transformer oil conducts indirect heat exchange with the SF6 heat exchange medium in the SF6 medium flow path through the side wall of the transformer oil flow path of the evaporator. The heat pump type main transformer heat exchange device has the great advantages of being safe, reliable, high in heat exchange efficiency, small in size, low in oil consumption and maintenance, economical in overall operation and the like, thereby being a revolutionary innovation in main transformer heat exchange modes.

Description

A kind of with SF 6for the heat-pump-type main transformer heat-exchanger rig of heat transferring medium

Technical field

The utility model relates to a kind of with SF ₆for the heat-pump-type main transformer heat-exchanger rig of heat transferring medium.

Background technology

Main transformer is in running, due to the effect of electricity and magnetic, its coil and iron core can generate heat, as can not be in time this heat taken away, to cause main transformer to burn the even serious accident of blast, therefore must come cooling coil and iron core by the transformer oil stream being full of in main transformer, and the heat that transformer oil stream is taken away needs to carry out heat exchange by heat abstractor, cooled cold oil stream enters main transformer body again and carries out cooling.The tradition main transformer type of cooling is mainly three kinds of air blast cooling, natural air cooled and water-cooleds, although water-cooled is economical, efficiency is also high, if if generation cooling water in cooling system is to main transformer Seepage, even minor leakage also will cause serious consequence; Air-cooled because air heat content is low, make main transformer cooling effectiveness low, main transformer, heat sink apparatus are manufactured the shortcomings such as bulky, many by oil mass, operating cost is high, maintenance is large.

The main transformer of the cold winter operation in the north, in underload or cold standby, when hot stand-by duty, transformer oil in main transformer causes oil viscosity large because temperature is low, be difficult for flowing, dielectric strength declines, when main transformer is now again fast when load up, often having little time to heat oil product flows it, now can cause the catastrophe failure of main transformer coil burnout, therefore need in addition main transformer oil to be heated guarantee safe handling, or in transformer oil, add pour-depressant addition to increase the mobility of oil product, but the chemical group branch of additive is electric to transformer oil, insulation property and physicochemical property have a negative impact, the long-term safe operation that uses threat main transformer.

Utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art part, provides a kind of with SF ₆for the heat-pump-type main transformer heat-exchanger rig of heat transferring medium, can take away safe, reliable, efficient, economically the heat energy that main transformer in service produces, again can be to heating to increase oil product mobility, safety, the economical operation of powerful guarantee electric power system main transformer at the main transformer of north cold area operation.

To achieve these goals, the technical solution of the utility model is: a kind of with SF ₆for the heat-pump-type main transformer heat-exchanger rig of heat transferring medium, comprise SF ₆heat pump compressor, cooler and evaporator, a port of described cooler is by the SF of bidirectional throttling valve and evaporator ₆medium stream one end mouth is connected, the SF of described evaporator ₆the another port of medium stream another port and cooler is by cross valve and SF ₆the two-port of heat pump compressor is connected, the transformer oil stream two-port of described evaporator is connected with the oil-in on main transformer body top and the oil-out of bottom respectively, the oil-in of described main transformer body is provided with main transformer inlet valve, the oil-out of described main transformer body is provided with main transformer delivery valve, transformer oil in described main transformer body is delivered to oil-in by oil pump from oil-out, and described transformer oil is by transformer oil stream sidewall and the SF of evaporator ₆sF in medium stream ₆heat transferring medium carries out indirect heat exchange.

Further, described bidirectional throttling valve is electromagnetic throttle valve, and described electromagnetic throttle valve is electrically connected at control module.

Further, on the connecting line between transformer oil flowing path outlet and the oil-in of main transformer body of described evaporator, oil temperature on-line measuring device is installed, described oil temperature on-line measuring device is electrically connected at control module.

Compared with prior art, the utlity model has following beneficial effect: due to the SF using ₆medium, it is except having good insulation, arc extinguishing, putting out combustion performance and stable physicochemical property, or a kind of good heat exchange media medium that has higher thermal enthalpy, heat exchange mode using it as heat exchange is compared with traditional main transformer heat exchange mode, have safe and reliable, heat exchange efficiency is high, equipment volume is little, few by oil mass, safeguard less, overall operation economic dispatch huge advantage, be the revolutionary character innovation of main transformer heat exchange mode.

The utility model is owing to using heat pump, evaporator in heat-exchanger rig and cooler can be exchanged to use, can be large at main transformer place high temperature season load, in the time that oil temperature exceedes settings, carry out cooling to oily stream, can in the time of northern severe cold season, heat transformer oil in the main transformer of underload, stand-by heat, cold standby again, prevent that oil from flowing because low temperature lowers mobility, reduction electrical insulation properties and physicochemical property, to ensure main transformer safe operation.

The utility model had both overcome in the middle of prior art with the main transformer of water-cooling pattern and is in operation and occurs to main transformer body seepage as cooling system, even small seepage, in main transformer, under high voltage environment, all will produce catastrophe failure, even the serious consequence of main transformer blast; The shortcomings such as prior art is central because air heat content is low, makes main transformer cooling effectiveness low with air blast cooling or natural air cooled main transformer, and device fabrication volume is large, many by oil mass, operating cost is high, maintenance workload is large are overcome again; Also overcome existing main transformer heat exchange mode more northern severe cold season underload main transformer and stand-by heat, cold standby main transformer oil are heated, to prevent the mobility of oil product in main transformer and to ensure the defect that oil product electric property, dielectric strength and physicochemical property do not decline.

Below in conjunction with the drawings and specific embodiments, the utility model is described in more detail.

Brief description of the drawings

Fig. 1 is the transformer oil flow circulating system schematic diagram of the utility model embodiment coiled.

Fig. 2 is the SF of the utility model embodiment coiled transformer oil when cooling ₆heat exchange circulatory system schematic diagram.

Fig. 3 is SF in the cross valve of transformer oil when cooling ₆heat transferring medium moves towards figure.

SF when Fig. 4 is the heating of the utility model embodiment coiled transformer oil ₆heat exchange circulatory system schematic diagram.

SF in cross valve when Fig. 5 is transformer oil heating ₆heat transferring medium moves towards figure.

Fig. 6 be the utility model embodiment coiled with SF ₆for the main transformer dish heat abstractor schematic diagram of heat transferring medium.

Fig. 7 is that the control module of the utility model embodiment coiled is controlled oil stream temperature functional-block diagram automatically.

Fig. 8 is the SF of shell and tube ₆heat exchange circulatory system schematic diagram.

Fig. 9 is board-like SF ₆heat exchange circulatory system schematic diagram.

Figure 10 is the schematic side view of plate-type evaporator.

Figure 11 is the structural representation of jacket type evaporator.

In figure: 1-SF ₆heat pump compressor, 2-cooler inlet pipe, 3-cooler, 4-blower fan, 5-cooler goes out pipe, 6-bidirectional throttling valve, 7-evaporator, the SF of 8-evaporator ₆medium stream, 9-evaporator SF ₆medium stream goes out pipe, 10-main transformer delivery valve, 11-oil pump, 12-oil pump outlet valve, 13-evaporator transformer oil stream inlet pipe, the transformer oil stream of 14-evaporator, 15-evaporator transformer oil stream goes out pipe, 16-oil temperature on-line measuring device, 17-main transformer inlet valve, 18-coil and iron core, 19-transformer oil, 20-cross valve, 21-the first valve, 22-the second valve, 23-the 3rd valve, 24-the 4th valve, A-main transformer body, B-conservator, the single SF of a- ₆board slot, the single oil stream of b-board slot.

Embodiment

As shown in Fig. 1 ~ 7, a kind of with SF ₆for the heat-pump-type main transformer heat-exchanger rig of heat transferring medium, comprise SF ₆heat pump compressor 1, cooler 3 and evaporator 7, a port of described cooler 3 is the SF with evaporator 7 through bidirectional throttling valve 6 ₆medium stream 8 one ports are connected, the SF of described evaporator 7 ₆the another port of medium stream 8 another port and cooler 3 is by cross valve 20 and SF ₆the two-port of heat pump compressor 1 is connected, transformer oil stream 14 two-port of described evaporator 7 are connected with the oil-in on main transformer body A top and the oil-out of bottom respectively, the oil-in of described main transformer body A is provided with main transformer inlet valve 17, the oil-out of described main transformer body A is provided with main transformer delivery valve 10, transformer oil 19 in described main transformer body A is delivered to oil-in by oil pump 11 from oil-out, and described transformer oil 19 is by transformer oil stream 14 sidewalls and the SF of evaporator 7 ₆sF in medium stream 8 ₆heat transferring medium carries out indirect heat exchange.

In the present embodiment, described SF ₆the SF of heat pump compressor 1, cross valve 20, cooler 3, bidirectional throttling valve 6 and evaporator 7 ₆medium stream 8 has formed SF ₆the heat exchange circulatory system, wherein SF ₆heat pump compressor 1 can be frequency conversion SF ₆heat pump compressor, cooler 3 can be the forced air cooler of being forced blowing by cooling blower 4; The transformer oil stream 14 of described main transformer body A, oil pump 11 and evaporator 7 has formed the transformer oil stream heat exchange circulatory system, and wherein the outlet of oil pump 11 is provided with oil pump outlet valve 12; Transformer oil stream 14 and the SF of described evaporator 7 ₆medium stream 8 is two medium flow process parts of isolation mutually, and transformer oil flow medium is walked transformer oil stream 14, SF in evaporator 7 ₆heat transferring medium is walked SF in evaporator 7 ₆8, two circulatory systems of medium stream are isolated mutually, transformer oil 19 and SF ₆medium carries out heat conduction by the sidewall (tube wall, wooden partition or shell wall) of transformer oil stream 14 in evaporator 7.

In the present embodiment, described evaporator 7 is coiled, the tube side that transformer oil stream 14 is coiled, SF ₆the shell side that medium stream 8 is coiled can also be wherein any such as shell and tube, board-like, jacket type certainly.As shown in Figure 8, in the time that evaporator 7 is shell and tube, the tube side that transformer oil stream 14 is shell and tube, SF ₆the shell side that medium stream 8 is shell and tube.As shown in Fig. 9 ~ 10, when evaporator 7 is while being board-like, transformer oil stream 14 is oil stream board slot group, SF ₆medium stream 8 is SF ₆board slot group, described SF ₆each SF of board slot group ₆board slot is overlapping with each oil stream board slot of oil stream board slot group.As shown in figure 11, in the time that evaporator 7 is jacket type, can be using main transformer body A inner chamber as transformer oil stream 14, on main transformer body A shell, weld clip cover is as SF ₆medium stream 8.

In the present embodiment, for the convenient oil outlet temperature that detects the interior transformer oil stream 14 of evaporator 7, on the connecting line between 14 outlets of transformer oil stream and the oil-in of main transformer body A of described evaporator 7, oil temperature on-line measuring device 16 is installed.In order to facilitate intelligent automatic control, specifically electromagnetic throttle valve of described bidirectional throttling valve 6, specifically temperature monitor of described oil temperature on-line measuring device 16, described SF ₆heat pump compressor 1 can be frequency conversion SF ₆heat pump compressor, described evaporator 7 is interior can be provided with the inner SF of induction ₆the pressure sensor of gas pressure; Described temperature monitor, electromagnetic throttle valve, frequency conversion SF ₆heat pump compressor and pressure sensor are all electrically connected at control module, its institute's evaporator that detects 7 transformer oil stream 14 oil outlet temperature signals are sent to control module by described temperature monitor, described control module regulates the valve opening of electromagnetic throttle valve, described frequency conversion SF ₆heat pump compressor can be adjusted electric machine frequency by control module automatically according to oil temperature control situation, and with reasonable manner operation, described control module can be to make by technological requirement design programming the PLC or the single-chip microcomputer etc. that form.When evaporator 7 transformer oil stream 14 oil outlet temperatures are when too high, the valve opening of electromagnetic throttle valve is turned in described control module control down, and described evaporator 7 evaporating pressures reduce, and then reduce the interior SF of evaporator 7 ₆evaporating temperature is to reduce evaporator 7 transformer oil stream 14 oil outlet temperatures, contrary conversely.

As shown in Fig. 1 ~ 7, a kind of with SF ₆for the heat-pump-type main transformer heat-exchange method of heat transferring medium, adopt as above with SF ₆for the heat-pump-type main transformer heat-exchanger rig of heat transferring medium, and carry out according to the following steps: (1) opens main transformer delivery valve 10, main transformer inlet valve 17 and oil pump 11, and the transformer oil in main transformer body A 19 is squeezed into the transformer oil stream 14 of evaporator 7 from oil-out; (2) open SF ₆heat pump compressor 1 and cooler 3, the transformer oil 19 in evaporator 7 transformer oil streams 14 is by sidewall and evaporator SF ₆the SF of circulation in medium stream 8 ₆heat transferring medium carries out indirect heat exchange; (3) transformer oil 19 after heat exchange is back to main transformer body A from oil-in, with this iterative cycles.

As shown in Fig. 2 ~ 3, in the time carrying out cooling transformer oil 19, in step (2), first open the cooling respective valves (the first valve 21 and the second valve 22) of cross valve 20, then open SF ₆heat pump compressor 1, SF ₆heat pump compressor 1 will be from evaporator SF ₆medium stream 8 low pressure SF out ₆gas compression becomes high pressure-temperature SF ₆gas, high pressure-temperature SF ₆gas enters in cooler 3 and becomes high temperature SF by blower fan semi-finals quenching processed ₆liquid, high temperature SF ₆liquid after bidirectional throttling valve 6 expenditure and pressures coolings to evaporator SF ₆medium stream 8, now because volume sudden enlargement causes part high temperature SF ₆liquid rotating becomes low pressure SF ₆gas, liquid evaporation becomes in the process of gas can a large amount of heat absorptions and make high temperature SF ₆fluid temperature sharply declines, the low temperature SF after temperature declines ₆liquid and the interior mobile heat transformer oil of evaporator 7 transformer oil stream 14 stream carry out heat conduction by sidewall, all flash to low pressure SF after heat absorption ₆gas, low pressure SF ₆gas again through cross valve 20 to SF ₆in heat pump compressor 1, compress, carry out the cool cycles of next round.The transformer oil 19 that its inside of described main transformer body A is full of mainly plays insulation and cooling effect, main transformer coil and iron core 18 are in operation because the effect of electricity, magnetic can be generated heat, as not in time this heat taken away, will cause main transformer to burn the even serious accident of blast.

As shown in Fig. 4 ~ 5, in the time carrying out heating transformer oil 19, in step (2), first open the heating respective valves (the 3rd valve 23 and the 4th valve 24) of cross valve 20, then open SF ₆heat pump compressor 1, SF ₆heat pump compressor 1 will from cooler 3(now cooler 3 be SF ₆the use of the evaporation endothermic of heat transferring medium) low-pressure low-temperature SF out ₆gas compression becomes high pressure-temperature SF ₆gas, high pressure-temperature SF ₆gas enters the SF of evaporator 7 ₆in medium stream 8 (now evaporator 7 does the use of heating transformer oil 19), the transformer oil 19 entering in evaporator 7 transformer oil streams 14 is heated, change low-pressure low-temperature SF into after self emitting heat ₆liquid, low-pressure low-temperature SF ₆liquid enters in cooler 3 after lowering the temperature by bidirectional throttling valve 6 expenditure and pressures, and absorber cooler 3 outer walls are flashed to low-pressure low-temperature SF after the air heat of blower fan semi-finals system blowing around ₆gas, low-pressure low-temperature SF ₆gas passes through again cross valve 20 to SF ₆in heat pump compressor 1, compress, carry out the heat cycles of next round.

In the present embodiment, for the convenient oil outlet temperature that detects the interior transformer oil stream 14 of evaporator 7, on the connecting line between 14 outlets of transformer oil stream and the oil-in of main transformer body A of described evaporator 7, oil temperature on-line measuring device 16 is installed.In order to facilitate intelligent automatic control, specifically electromagnetic throttle valve of described bidirectional throttling valve 6, specifically temperature monitor of described oil temperature on-line measuring device 16, described SF ₆heat pump compressor 1 can be frequency conversion SF ₆heat pump compressor, described evaporator 7 is interior can be provided with the inner SF of induction ₆the pressure sensor of gas pressure; Described temperature monitor, electromagnetic throttle valve, frequency conversion SF ₆heat pump compressor and pressure sensor are all electrically connected at control module.As shown in Figure 7, can, according to the real-time online data of temperature monitor, regulate electromagnetic throttle valve by control module, automatically control the SF in evaporator 7 ₆evaporating pressure and SF ₆evaporating temperature, to ensure that the inlet oil temperature of main transformer body A is controlled in the scope of setting, described frequency conversion SF ₆heat pump compressor can be adjusted electric machine frequency by control module automatically according to oil temperature control situation, with reasonable manner operation.

The foregoing is only preferred embodiment of the present utility model, all equalizations of doing according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.

Claims (3)

1. one kind with SF ₆for the heat-pump-type main transformer heat-exchanger rig of heat transferring medium, it is characterized in that: comprise SF ₆heat pump compressor, cooler and evaporator, a port of described cooler is by the SF of bidirectional throttling valve and evaporator ₆medium stream one end mouth is connected, the SF of described evaporator ₆the another port of medium stream another port and cooler is by cross valve and SF ₆the two-port of heat pump compressor is connected, the transformer oil stream two-port of described evaporator is connected with the oil-in on main transformer body top and the oil-out of bottom respectively, the oil-in of described main transformer body is provided with main transformer inlet valve, the oil-out of described main transformer body is provided with main transformer delivery valve, transformer oil in described main transformer body is delivered to oil-in by oil pump from oil-out, and described transformer oil is by transformer oil stream sidewall and the SF of evaporator ₆sF in medium stream ₆heat transferring medium carries out indirect heat exchange.

2. according to claim 1 with SF ₆for the heat-pump-type main transformer heat-exchanger rig of heat transferring medium, it is characterized in that: described bidirectional throttling valve is electromagnetic throttle valve, and described electromagnetic throttle valve is electrically connected at control module.

3. according to claim 1 with SF ₆for the heat-pump-type main transformer heat-exchanger rig of heat transferring medium, it is characterized in that: on the connecting line between transformer oil flowing path outlet and the oil-in of main transformer body of described evaporator, oil temperature on-line measuring device is installed, described oil temperature on-line measuring device is electrically connected at control module.