CN203706798U - Main transformer tube nest type cooling device with SF6 medium as coolant - Google Patents

Abstract

The utility model relates to a main transformer tube nest type cooling device with an SF6 medium as the coolant. The main transformer tube nest type cooling device is composed of a transformer oil flow cooling circulation system and an SF6 coolant circulation system. The transformer oil flow cooling circulation system comprises a main transformer body, an oil pump and a tube pass of a tube nest type SF6 evaporator. Transformer oil is contained in the main transformer body. The upper portion of the main transformer body is provided with a cold oil inlet and a cold oil inlet valve. The lower portion of the main transformer body is provided with a hot oil outlet and a hot oil outlet valve. The oil pump conveys the hot transformer oil from the hot oil outlet to an inlet of the tube pass of the tube nest type SF6 evaporator. The hot transformer oil is cooled by the SF6 coolant surrounding the tube pass in the SF6 coolant circulation system and then flows to the cold oil inlet from an outlet of the tube pass of the tube nest type SF6 evaporator. The main transformer tube nest type cooling device has the great advantages of being safe, reliable, high in cooling 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 cooling modes.

Description

A kind of with SF 6for the main transformer shell and tube heat abstractor of coolant media

Technical field

The utility model relates to a kind of with SF ₆for the main transformer shell and tube heat abstractor of coolant media.

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.

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 main transformer shell and tube heat abstractor of coolant media, can take away safe, reliable, efficient, economically the heat energy that main transformer in service produces, safety, the economical operation of powerful guarantee electric power system main transformer.

To achieve these goals, the technical solution of the utility model is: a kind of with SF ₆for the main transformer shell and tube heat abstractor of coolant media, by transformer oil stream cooling recirculation system and SF ₆coolant circulating system composition, described transformer oil stream cooling recirculation system comprises main transformer body, oil pump and shell and tube SF ₆the tube side of evaporator, in described main transformer body, be loaded with coil and iron core are carried out to cooling transformer oil, described main transformer body top is provided with cold oil import and the cold oil inlet valve for inputting cold transformer oil, described main transformer body bottom is provided with for the hot oil outlet of heat outputting transformer oil and deep fat delivery valve, and described oil pump is delivered to shell and tube SF by heat transformer oil from hot oil outlet ₆the tube side import of evaporator, described heat transformer oil is by SF ₆in coolant circulating system, be enclosed in tube side SF around ₆after refrigerant is cooling from shell and tube SF ₆the tube side outlet of evaporator flow to cold oil import.

Further, described SF ₆coolant circulating system comprises SF ₆refrigerant compressor, cooler, choke valve and shell and tube SF ₆the shell side of evaporator, described shell and tube SF ₆the outlet of evaporator shell side connects SF ₆the import of refrigerant compressor, described SF ₆the outlet of refrigerant compressor connects the import of cooler, and the outlet of described cooler connects shell and tube SF by choke valve ₆the import of evaporator shell side.

Further, described shell and tube SF ₆on pipeline between tube side outlet and the cold oil import of main transformer body of evaporator, oil temperature on-line measuring device is installed.

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 refrigerant that has higher thermal enthalpy, the shell and tube evaporation endothermic type of cooling using it as refrigerant is compared with traditional main transformer type of cooling, have safe and reliable, cooling effectiveness is high, equipment volume is little, few by oil mass, safeguard less, overall operation economic dispatch huge advantage, be the revolutionary character innovation of the main transformer type of cooling.

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; Compared with being now widely used traditional main transformer radiating mode, the utility model has huge advantage.

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

Accompanying drawing explanation

Fig. 1 is the transformer oil stream cooling recirculation system schematic diagram of the utility model embodiment.

Fig. 2 is the SF of the utility model embodiment ₆coolant circulating system schematic diagram.

Fig. 3 be the utility model embodiment with SF ₆for the main transformer shell and tube heat abstractor schematic diagram of coolant media.

Fig. 4 is that the control module of the utility model embodiment is controlled cold oil stream temperature functional-block diagram automatically.

In figure: 1-SF ₆refrigerant compressor, 2-cooler inlet pipe, 3-cooler, 4-cooling blower, 5-cooler goes out pipe, 6-choke valve, 7-shell and tube SF ₆evaporator, the import of 8-evaporator tube side, 9-shell and tube SF ₆the tube side of evaporator, oil stream in 10-evaporator tube side, the outlet of 11-evaporator tube side, the outlet of 12-evaporator shell side, 13-evaporator shell side outlet SF ₆flow process, the import of 14-evaporator shell side, 15-shell and tube SF ₆the shell side of evaporator, 16-SF ₆the flow process of refrigerant in evaporator shell side, 17-deep fat delivery valve, 18-oil pump, 19-oil pump outlet valve, 20-cold oil inlet valve, 21-oil temperature on-line measuring device, 22-coil and iron core, 23-transformer oil, A-main transformer body, B-conservator.

Embodiment

As shown in Fig. 1 ~ 3, a kind of with SF ₆for the main transformer shell and tube heat abstractor of coolant media, by transformer oil stream cooling recirculation system and SF ₆coolant circulating system composition, described transformer oil stream cooling recirculation system comprises main transformer body A, oil pump 18 and shell and tube SF ₆the tube side 9 of evaporator 7, in described main transformer body A, be loaded with coil and iron core 22 are carried out to cooling transformer oil 23, described main transformer body A top is provided with cold oil import and the cold oil inlet valve 20 for inputting cold transformer oil, described main transformer body A bottom is provided with hot oil outlet and the deep fat delivery valve 17 for heat outputting transformer oil, and described oil pump 18 is delivered to shell and tube SF by heat transformer oil 23 from hot oil outlet ₆tube side 9 imports 8 of evaporator 7, described heat transformer oil is by SF ₆in coolant circulating system, be enclosed in tube side 9 SF around ₆after refrigerant is cooling from shell and tube SF ₆the tube side 9 of evaporator 7 exports 11 and flow to cold oil import.Wherein, the transformer oil 23 that its inside of described main transformer body A is full of mainly plays insulation and cooling effect, main transformer coil and iron core 22 are in operation because the effect of electricity, magnetic can be generated heat, and as not in time this heat taken away, will cause main transformer to burn the even serious accident of blast.

In the present embodiment, described SF ₆coolant circulating system comprises SF ₆refrigerant compressor 1, cooler 3, choke valve 6 and shell and tube SF ₆the shell side 15 of evaporator 7, described shell and tube SF ₆the outlet of evaporator 7 shell sides connects SF ₆the import of refrigerant compressor 1, described SF ₆the outlet of refrigerant compressor 1 connects the import of cooler 3, and the outlet of described cooler 3 connects shell and tube SF by choke valve 6 ₆the import 14 of evaporator 7 shell sides.Wherein, described cooler 3 can be the forced air cooler of being forced quenching by cooling blower 4, can be also water cooler, owing to being SF in cooler 3 ₆media for heat exchange, therefore just in case cooling water seepage is also irrelevant with main transformer oil stream; Described shell and tube SF ₆that evaporator 7 has is safe and reliable, heat exchange efficiency is high, cleaning is easy, safeguard the advantages such as simple; Described shell and tube SF ₆evaporator 7 is divided into tube side 9 and 15 two medium flow process parts of isolating mutually of shell side, and transformer oil flow medium is at shell and tube SF ₆in evaporator 7, walk tube side 9, SF ₆coolant media is at shell and tube SF ₆in evaporator 7, walk 15, two circulatory systems of shell side and mutually isolate, transformer oil and SF ₆refrigerant is by shell and tube SF ₆in evaporator 7, the tube wall of tube side 9 carries out indirect heat exchange.

In the present embodiment, the outlet of described oil pump 18 is provided with oil pump outlet valve 19, and described oil pump outlet valve 19 is connected to the tube side 9 in evaporator through evaporator oil stream tube side inlet pipe.Regulate cooling rate, the outlet of described cooler 3 and shell and tube SF for convenient according to actual conditions ₆on pipeline between the import 14 of evaporator 7 shell sides, choke valve 6 is installed, with to high temperature SF ₆liquid carries out expenditure and pressure.For the convenient oil outlet temperature that detects tube side 9 in evaporator, described shell and tube SF ₆tube side 9 outlet of evaporator 7 and the evaporator oil between the cold oil import of main transformer body A flow tube side and go out oil temperature on-line measuring device 21 is installed on pipe.

In the present embodiment, as shown in Figure 4, in order to facilitate intelligent automatic control, specifically electromagnetic throttle valve of described choke valve 6, specifically temperature monitor of described oil temperature on-line measuring device 21, described shell and tube SF ₆evaporator 7 is interior can be provided with the inner SF of induction ₆the pressure sensor of gas pressure; Described temperature monitor, electromagnetic throttle valve and pressure sensor are all electrically connected at control module, described temperature monitor detects that by it evaporator tube side oil outlet temperature signal sends to control module, described control module regulates the valve opening of electromagnetic throttle valve, and described control module can be to make by technological requirement design programming the PLC or the single-chip microcomputer etc. that form.In the time that evaporator tube side oil outlet temperature is too high, the valve opening of electromagnetic throttle valve is turned in described control module control down, described shell and tube SF ₆evaporator 7 evaporating pressures reduce, and then reduce SF in evaporator ₆evaporating temperature is to reduce evaporator tube side oil outlet temperature, contrary conversely.

As shown in Fig. 1 ~ 3, should be with SF ₆for the using method of the main transformer shell and tube heat abstractor of coolant media is carried out according to the following steps: (1) opens deep fat delivery valve 17 of main transformer body A bottom and the cold oil inlet valve 20 on top, open oil pump outlet valve 19; (2) open oil pump 18 and SF ₆coolant circulating system, the heat that mobile transformer oil produces main transformer coil and iron core 22 in main transformer body A is taken away, and transformer oil self is heated and become heat transformer oil, and the heat transformer oil being flowed out by deep fat delivery valve 17 is squeezed into shell and tube SF through oil pump 18 ₆the tube side 9 of evaporator 7, and and SF ₆in coolant circulating system, be enclosed in the tube side 9 low temperature SF of circulation around ₆refrigerant carries out heat exchange, and its heat is by low temperature SF ₆refrigerant is taken away and is become cold transformer oil, and cold transformer oil comes back in main transformer main body through cold oil inlet valve 20, and coil and iron core 22 are carried out to next round cool cycles.

In the present embodiment, in step (2), described SF ₆coolant circulating system comprises SF ₆refrigerant compressor 1, cooler 3, choke valve 6 and shell and tube SF ₆the shell side 15 of evaporator 7, its operation method is as follows: open SF ₆refrigerant compressor 1, SF ₆refrigerant compressor 1 is by the low pressure SF from evaporator shell side outlet 12 ₆gas compression becomes high pressure-temperature SF ₆gas; Through SF ₆high pressure-temperature SF after refrigerant compressor 1 compression ₆gas enters in cooler 3 by cooler inlet pipe 2, by cooling blower semi-finals quenching processed, by high pressure-temperature SF ₆gas cooled is high temperature SF ₆liquid; High temperature SF ₆liquid after choke valve 6 expenditure and pressures coolings at shell and tube SF ₆in evaporator 7 shell sides 15, absorb the heat of heat transformer oil in tube sides in a large number and flash to low pressure SF ₆gas, low pressure SF ₆gas is delivered to again SF ₆compression in refrigerant compressor 1, with this iterative cycles.

In the present embodiment, in step (2), from cooler 3 high temperature SF out ₆liquid flow to shell and tube SF through choke valve 6 ₆the shell side 15 of evaporator 7, 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 ₆in liquid and evaporator, the mobile heat transformer oil stream of tube side 9 carries out heat exchange by tube wall, all flashes to low pressure SF after heat absorption ₆gas, is back to SF through evaporator shell side outlet 12 ₆the import of refrigerant compressor 1, carries out next round heat exchange circulation.

In the present embodiment, as shown in Figure 4, can, according to the real-time online data of temperature monitor, regulate electromagnetic throttle valve automatically to control SF in evaporator shell side by control module ₆evaporating pressure and evaporating temperature, be controlled in the scope of setting with the oil outlet temperature of the transformer oil that guarantees to be cooled in evaporator tube side.

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 main transformer shell and tube heat abstractor of coolant media, it is characterized in that: by transformer oil stream cooling recirculation system and SF ₆coolant circulating system composition, described transformer oil stream cooling recirculation system comprises main transformer body, oil pump and shell and tube SF ₆the tube side of evaporator, in described main transformer body, be loaded with coil and iron core are carried out to cooling transformer oil, described main transformer body top is provided with cold oil import and the cold oil inlet valve for inputting cold transformer oil, described main transformer body bottom is provided with for the hot oil outlet of heat outputting transformer oil and deep fat delivery valve, and described oil pump is delivered to shell and tube SF by heat transformer oil from hot oil outlet ₆the tube side import of evaporator, described heat transformer oil is by SF ₆in coolant circulating system, be enclosed in tube side SF around ₆after refrigerant is cooling from shell and tube SF ₆the tube side outlet of evaporator flow to cold oil import.

2. according to claim 1 with SF ₆for the main transformer shell and tube heat abstractor of coolant media, it is characterized in that: described SF ₆coolant circulating system comprises SF ₆refrigerant compressor, cooler, choke valve and shell and tube SF ₆the shell side of evaporator, described shell and tube SF ₆the outlet of evaporator shell side connects SF ₆the import of refrigerant compressor, described SF ₆the outlet of refrigerant compressor connects the import of cooler, and the outlet of described cooler connects shell and tube SF by choke valve ₆the import of evaporator shell side.

3. according to claim 1 and 2 with SF ₆for the main transformer shell and tube heat abstractor of coolant media, it is characterized in that: described shell and tube SF ₆on pipeline between tube side outlet and the cold oil import of main transformer body of evaporator, oil temperature on-line measuring device is installed.