WO1998001871A1 - Systeme de refroidissement pour station secondaire - Google Patents

Systeme de refroidissement pour station secondaire Download PDF

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Publication number
WO1998001871A1
WO1998001871A1 PCT/JP1996/001870 JP9601870W WO9801871A1 WO 1998001871 A1 WO1998001871 A1 WO 1998001871A1 JP 9601870 W JP9601870 W JP 9601870W WO 9801871 A1 WO9801871 A1 WO 9801871A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooling
water
temperature
cooling water
pipe
Prior art date
Application number
PCT/JP1996/001870
Other languages
English (en)
Japanese (ja)
Inventor
Takashi Iga
Takeshi Sakamoto
Hiroyuki Fujita
Seiichiro Ono
Original Assignee
Hitachi, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi, Ltd. filed Critical Hitachi, Ltd.
Priority to JP50502098A priority Critical patent/JP3619522B2/ja
Priority to PCT/JP1996/001870 priority patent/WO1998001871A1/fr
Priority to TW086101124A priority patent/TW377527B/zh
Publication of WO1998001871A1 publication Critical patent/WO1998001871A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating

Definitions

  • the present invention relates to a substation cooling system, and in particular, to a substation suitable for suppressing a temperature rise of a transformer structure caused by an overload operation of a transformer installed in a substation, for example, an underground substation.
  • a substation cooling system for example, an underground substation.
  • transformers in substations installed in urban areas have been required to be nonflammable for disaster prevention purposes.
  • the demand for power has increased and the capacity has been increased, and it has become difficult to secure installation locations.
  • transformers There is a growing demand for transformers to be installed underground in buildings and the like.
  • heat generated by transformers is collected at as high a temperature as possible and used for heat sources such as hot water supply and heating of building equipment.
  • a transformer when a transformer is installed underground in a building or the like, heat generated in the transformer structure is transmitted to a cooling medium that cools the transformer, and is transmitted to cooling water through a water-cooled cooler.
  • the cooling water is pumped to a cooling tower installed on the roof of a building by a pump, cooled by the cooling tower, and then returned to the water-cooled cooler of the transformer.
  • a part of the cooling water pumped from the water-cooled cooler for the transformer to the cooling tower may be branched to the mature load side such as hot water supply.
  • substations are installed with multiple transformers. If one transformer breaks down or becomes inoperable, another transformer is temporarily overloaded. There are times when I have to do it.
  • the transformer is overloaded, As the current flowing through the transformer winding increases, the calorific value of the transformer increases, and as a result, cooling such as the transformer winding and other structures and insulators that are in contact with these structures are cooled. The temperature of the medium and the cooling water that cools the cooling medium rises.
  • insulators have a shortened life and an unreliable reliability when the temperature is excessively high.
  • a storage tank for transformer cooling medium is provided in addition to the cooler for transformer, and the cooling medium returned from the cooler during overload operation of the transformer is Japanese Patent Application Laid-Open No. 59-5607 proposes to partially mix a low-temperature cooling medium to lower the temperature of the cooling medium entering the transformer.
  • the storage tank has a considerably large volume and requires a large space.
  • the cooling medium is limited to the liquid state, and it is almost impossible to apply it to gas-insulated transformers in which the cooling medium is gas.
  • the present invention has been made in view of the above points, and an object of the present invention is to maintain a condition in which heat from a transformer installed in an underground substation or the like can be effectively used for hot water supply at a temperature capable of recovering heat.
  • the substation cooling system does not increase the temperature rise of the structure excessively and shorten the life of the insulator even when the transformer is temporarily overloaded.
  • the present invention relates to a transformer body including a winding core and cooled by a cooling medium, a water-cooled cooler for cooling the cooling medium of the transformer body, and a pipe connecting the water-cooled cooler and the transformer body.
  • a refrigerant circulator for circulating the cooling medium, a cooling tower for cooling the cooling water from the water-cooled cooler, a pipe for connecting the cooling tower and the water-cooled cooler,
  • a transformer cooling system that is provided in the middle of the pipe and includes a cooling water circulation pump that circulates the cooling water;
  • the transformer can be downsized while maintaining the conditions where heat from the transformer installed in an underground substation etc. can be effectively recovered at a temperature that can be used effectively for hot water supply, etc. It is possible to obtain a substation cooling system that does not increase the temperature rise of the structure excessively even under load operation and does not shorten the life of the insulator.
  • FIG. 1 is a schematic diagram showing one embodiment of a substation cooling system of the present invention.
  • FIG. 2 is a characteristic diagram showing a temperature change with respect to time of a transformer load and a main fluid in one embodiment of the present invention.
  • FIG. 3 is a schematic diagram showing another embodiment of the substation cooling system of the present invention.
  • Fig. 1 shows an embodiment of the substation cooling system according to the present invention, which is an example of an underground substation with a cooling system for the underground Cape Cave tunnel, which cools the chillers and cave necessary for the cooling system for the canal.
  • a regenerative heat storage tank for storing low-temperature cooling water and returned cooling water is installed.
  • 1 is a transformer body
  • 2 is a water-cooled cooler that cools a cooling medium 3 of the transformer body 1 with cooling water 4
  • 5 is a refrigerant circulating pump or blower for circulating the cooling medium 3.
  • 6a is a pipe connecting the transformer body 1 and the water-cooled cooler 2
  • 6b is a pipe connecting the water-cooled cooler 2 and a refrigerant circulator 5 such as a blower.
  • 7 is a cooling tower that cools the cooling water 4 with the atmosphere
  • 8 is a cooling water circulation pump that sends the cooling water 4 to the cooling tower ⁇
  • 9a is a rising pipe that guides the cooling water 4 to the cooling tower 7
  • 9b is cooling Return pipe for cooling water 4 from tower 7.
  • Cooling water storage tank that stores the low-temperature cooling water 14a used to cool the cooling water and the high-temperature cooling water 14b after cooling the underground cable
  • 12 is a refrigerator that cools the high-temperature cooling water 14b.
  • Reference numeral 13 denotes a cooling tower for the refrigerator 12.
  • 1 5a is a cold storage tank 1 1
  • Low-temperature cooling water 1 1 is a water pipe for flowing cooling water for cave cooling to 10 a cave 10 and 15b is cooling of hot cave from a cave 10 0 Storage tank for cooling water
  • the water pipe 15a has a pump 16 that pumps the low-temperature cooling water 14a and sends it to the water pipe 15a. Also, 17a is a cold storage tank
  • a pipe that sends the low-temperature cooling water 14 cooled by 1 2 14 a to the regenerator tank 1 1, 18 is a pump that pumps the high-temperature cooling water 14 b placed in the middle of the pipe 17 a, and a pump 19 b is Piping for transporting cooling water from the refrigerator 1 2 to the cooling tower 13
  • 1 9a is a pipe that returns cooling water from the cooling tower 13 to the refrigerator 12; 20 is a pipe
  • 21 is a pipe that pumps low-temperature cooling water 14a from the cold storage heat tank 11 and pumps it into the return pipe 9b, and 23 adjusts the flow rate of low-temperature cooling water to the return pipe 9b.
  • It is a flow control valve.
  • Reference numeral 24 denotes a pipe for returning a part of the cooling water returning from the cooling tower 7 from the return pipe 9 b to the regenerator tank 11, and reference numeral 25 denotes a stop valve arranged in the middle of the pipe 24.
  • Reference numeral 26 denotes a thermometer for detecting the temperature of the cooling water entering the water-cooled cooler 2 from the cooling tower 7, and reference numeral 27 denotes the operation of the pump 22 and the flow control valve 23 based on the signal of the thermometer 26. Is a control device for instructing the opening degree of the vehicle. In an underground substation cooling system with such a configuration, the pump 22 is not operated under normal load operation, and the flow control valve 23 and the stop valve
  • the cooling medium 3 is sent into the transformer body 1 by the pump or the refrigerant circulator (blower) 5.
  • the structure of the transformer body 1 is cooled, and the cooling medium 3 that has taken heat is taken out from the upper part of the transformer body 1 and guided to the water-cooled cooler 2 via the pipe 6a to be cooled.
  • the cooling medium cooled by the water-cooled cooler 2 returns to the transformer body 1 again through the pipe 6b.
  • the cooling water 4 is raised by the cooling water circulating pump 8 via the water-cooled cooler 2, rises the riser 9 a, is guided to the cooling tower 7, and is cooled, and is cooled by the cooling tower 7. 4 circulates through the return pipe 9 b and returns to the water-cooled cooler 2.
  • the system that cools the canal 10 in which the underground cable is installed consists of a high-temperature cooling water 14 b in the cold storage tank 11, a pump 18, a pump 17, a pipe 17 a, and a refrigerator 12.
  • a high-temperature cooling water 14 b in the cold storage tank 11 a pump 18, a pump 17, a pipe 17 a, and a refrigerator 12.
  • the exhaust heat from the refrigerator 12 is ripened to the atmosphere by the cooling tower 3.
  • the low-temperature cooling water 14a in the regenerative heat storage tank 11 and the underground cable in the cave 10 are cooled by being introduced into the cave 10 via the pipe 15a by the pump 16 After cooling, the cooling water returns to the cold storage tank 11 through the pipe 15b to become high-temperature cooling water 14b.
  • the amount of low-temperature cooling water 14a increases and the amount of high-temperature cooling water 14b decreases at low load or at night.
  • a transformer fails or becomes inoperable and one of the other transformers is temporarily overloaded, the amount of heat generated by the overloaded transformer increases, and the transformer, such as a winding, The temperature of the transformer structure gradually rises, so that the temperature of the cooling medium 3 for cooling the transformer body 1 and the temperature of the cooling water 4 for cooling the cooling medium 3 also gradually rise.
  • the controller 27 operates according to a signal from the thermometer 26.
  • the pump 22 starts, the flow regulating valve 23 opens, and the low-temperature cooling water 14 a is pumped from the cold storage heat tank 11, passes through the pipe 21, and returns to the cooling water circulation pump 8 of the return pipe 9 b. Mixed into the upstream side.
  • the opening degree of the flow control valve 23 is adjusted by the controller 27 so that the temperature detected by the thermometer 26 becomes a predetermined value.
  • the stop valve 25 in the pipe 24 opens, and cooling water of the same flow rate as the mixed low-temperature cooling water 14a passes through the pipe 24 and cools down. It flows into the high-temperature cooling water 14 b side of the heat tank 11.
  • the flow rate of the low-temperature cooling water 14a to be mixed with the cooling water from the cooling tower 7 can be estimated from the value of the overload operation load and the expected duration, and the size of the cold storage heat tank 11 can be estimated. Just set it.
  • the temperature of the cooling water 4 does not significantly exceed a predetermined value. Therefore, the temperature of the cooling medium 3, the temperature of the transformer structure, The life of the insulator can be maintained without excessively increasing the temperature of the insulator.
  • Fig. 2 is a characteristic diagram showing the load of the transformer and the temperature changes of structures and fluids at major positions with respect to time in the embodiment shown in Fig. 1.
  • the broken line is the solid line in the case of the conventional technology. Indicates a temperature change situation in the case of the present embodiment.
  • the calorific value of the structure of the transformer body 1 increases as described above, and the temperature rises. With this, the fluid in each part also receives heat from the structure and the temperature rise increases.
  • the temperature of the structure gradually rises and rises monotonously as long as the overload operation continues, but in the case of the present embodiment, the temperature of the cooling water entering the water-cooled cooler 2 is reduced.
  • the low-temperature cooling water 4a is mixed in, so that the temperature is kept almost constant, and accordingly the temperature rise in each part is kept low. The temperature can be reduced.
  • FIG. 3 is a schematic diagram of a substation cooling system showing another embodiment according to the present invention.
  • the low-temperature cooling water 14a to the cooling water inlet side of the water-cooled cooler 2 of each transformer body 1 Is shown in FIG.
  • a low-temperature cooling water 14a is branched off to the water cooler 2 via a stop valve 28 on the cooler side via a stop valve 28 on the downstream side of the flow control valve 23.
  • thermometer 26 that detects the temperature of the cooling water is installed on the cooling water inlet side of the water-cooled cooler 2 of each transformer in the same manner as shown in FIG. Further, the control device 27 specifies a transformer to be overloaded and sends a signal to be opened to a stop valve 28 to be opened according to the specified transformer. Further, a stop valve 25 is provided in the middle of the pipe 24 for returning the cooling water 4 from the cooling tower 7 to the regenerative heat storage tank 11 at the same time from the control device 27.In such a configuration, the overload operation is started. The temperature of the transformer structure gradually rises, and the temperatures of the cooling medium 3 and the cooling water 4 also rise.
  • windings and iron cores are included.
  • a transformer cooled by a cooling medium, a water-cooled cooler for cooling the cooling medium of the transformer body, a pipe connecting the water-cooled cooler and the transformer body, and installed in the middle of the pipe.
  • a refrigerant circulator that circulates the cooling medium, a cooling tower that cools the cooling water from the water-cooled cooler, a pipe that connects the cooling tower and the water-cooled cooler,
  • a transformer cooling system comprising a cooling water circulation pump for circulating the cooling water,
  • Transformers can be downsized while maintaining conditions where heat from transformers installed in underground substations etc. can be effectively used for hot water supply while maintaining heat recovery, as well as temporary overload operation of transformers Therefore, it is possible to obtain a substation cooling system that does not increase the temperature rise of the structure excessively and does not shorten the life of the insulator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Transformer Cooling (AREA)

Abstract

Système de refroidissement conçu pour une station secondaire et comprenant un corps de transformateur (1) pourvu d'une unité de refroidissement (2) à eau, une machine (5) servant à faire circuler un milieu de refroidissement (3), une colonne de refroidissement (7) servant à refroidir l'eau, un siphon (10), un réservoir (11) d'accumulation de froid servant à conserver de l'eau de refroidissement (14a) à basse température refroidissant le siphon (10), une machine de réfrigération (12) servant à produire l'eau de refroidissement à basse température, une colonne de refroidissement (13) servant à irradier de la chaleur depuis la machine de réfrigération (12). Ce système de refroidissement comprend, de plus, une pompe (22) servant à pomper l'eau de refroidissement (14a) à basse température, une soupape de régulation de débit (23) de l'eau de refroidissement (14a) à basse température, un détecteur de température (25) situé à l'entrée de l'unité de refroidissement (2) et un conduit (21) servant à amener l'eau de refroidissement (14a) à basse température vers l'entrée de l'unité de refroidissement (2). Quand le corps de transformateur (1) est mis en service en surcharge, la pompe (22) alimente le côté entrée de l'unité de refroidissement (2) en eau de refroidissement (14a) à basse température, ce qui permet d'empêcher une hausse excessive de la température de l'eau de refroidissement vers l'ensemble de refroidissement (2) et de supprimer, par conséquent, la montée en température d'une structure de transformateur jusqu'à un certain point.
PCT/JP1996/001870 1996-07-05 1996-07-05 Systeme de refroidissement pour station secondaire WO1998001871A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP50502098A JP3619522B2 (ja) 1996-07-05 1996-07-05 変電所冷却システム
PCT/JP1996/001870 WO1998001871A1 (fr) 1996-07-05 1996-07-05 Systeme de refroidissement pour station secondaire
TW086101124A TW377527B (en) 1996-07-05 1997-01-31 Cooling system of power transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1996/001870 WO1998001871A1 (fr) 1996-07-05 1996-07-05 Systeme de refroidissement pour station secondaire

Publications (1)

Publication Number Publication Date
WO1998001871A1 true WO1998001871A1 (fr) 1998-01-15

Family

ID=14153504

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1996/001870 WO1998001871A1 (fr) 1996-07-05 1996-07-05 Systeme de refroidissement pour station secondaire

Country Status (3)

Country Link
JP (1) JP3619522B2 (fr)
TW (1) TW377527B (fr)
WO (1) WO1998001871A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107147024A (zh) * 2017-06-09 2017-09-08 太仓市霍普思机械技术有限公司 一种电气工程用电气箱
CN115939993A (zh) * 2023-03-15 2023-04-07 陕西同力电气有限公司 一种散热式高低压开关柜及散热冷却方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102568761A (zh) * 2010-12-23 2012-07-11 上海市电力公司 一种地下变电站变压器冷却方法
CN105529153B (zh) * 2016-02-25 2017-02-22 王威 插片式调节变压器
CN105632711B (zh) * 2016-03-07 2017-03-08 饶丽华 特种电压变换设备
CN107025981B (zh) * 2017-06-15 2018-10-16 国网山东省电力公司龙口市供电公司 一种电力变压器用自动喷淋降温装置及喷淋降温方法
CN113067255B (zh) * 2021-03-09 2022-09-27 安徽中意电气成套设备有限公司 一种智能监控型高低压配电柜及其监控方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03129711A (ja) * 1989-09-27 1991-06-03 Toshiba Corp ガス絶縁変圧器
JPH04274306A (ja) * 1991-03-01 1992-09-30 Takaoka Electric Mfg Co Ltd ガス絶縁電気機器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03129711A (ja) * 1989-09-27 1991-06-03 Toshiba Corp ガス絶縁変圧器
JPH04274306A (ja) * 1991-03-01 1992-09-30 Takaoka Electric Mfg Co Ltd ガス絶縁電気機器

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107147024A (zh) * 2017-06-09 2017-09-08 太仓市霍普思机械技术有限公司 一种电气工程用电气箱
CN115939993A (zh) * 2023-03-15 2023-04-07 陕西同力电气有限公司 一种散热式高低压开关柜及散热冷却方法
CN115939993B (zh) * 2023-03-15 2023-08-29 陕西同力电气有限公司 一种散热式高低压开关柜及散热冷却方法

Also Published As

Publication number Publication date
JP3619522B2 (ja) 2005-02-09
TW377527B (en) 1999-12-21

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