CN1186872C - Evaporative cooling equipment of stator winding of hydraulic generator - Google Patents
Evaporative cooling equipment of stator winding of hydraulic generator Download PDFInfo
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- CN1186872C CN1186872C CNB011313994A CN01131399A CN1186872C CN 1186872 C CN1186872 C CN 1186872C CN B011313994 A CNB011313994 A CN B011313994A CN 01131399 A CN01131399 A CN 01131399A CN 1186872 C CN1186872 C CN 1186872C
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Abstract
The present invention belongs to electrical machine cooling technology which relates to an evaporative cooling device of a stator winding of a hydraulic generator. A fully closed self-circulating system of a cooling medium is charged in the device, the stator winding of the generator is formed by that a hollow conductor and a solid conductor are combined, and the upper and the lower ends of the stator winding are connected with an upper insulating guide pipe and a lower insulating guide pipe respectively through electrohydraulic separation joints of the upper end and the lower end, wherein the upper insulating guide pipe is connected with the condensing space of a condenser through a gas collecting pipe, the lower insulating guide pipe is connected with the lower end of a liquid returning pipe through a liquid collecting pipe, and the upper end of the liquid returning pipe is connected with the condensing space of the condenser. A plurality of condensers needed by the whole generator are connected in parallel through an upper bustle pipe, and a plurality of liquid returning pipes are connected in parallel through a liquid collecting pipe. The device is also provided with a secondary cooling water leakage detecting instrument of the condenser, completely avoids a serious accident that a short circuit is caused by that the cooling medium leaks and breaks winding coil insulation, operational reliability is improved great, and investment and operational cost are saved.
Description
Technical field:
The invention belongs to the cooling technology of generator, a kind of evaporation-cooled device of hydraulic generator stator winding is provided.
Background technology
As everyone knows, the hydraulic generator stator winding of prior art generally adopts air cooling and water-cooled.Air-cooled Unit is by the outside blowing cooling of winding insulation, so cooling effect is poor, has limited unit and has developed to bigger capacity.The water-cooled unit is by the water pump pressurization water to be flowed in the winding hollow conductor, takes away heat, thereby good cooling results.In case but the cooling water leakage often causes short circuit, forces the compressor emergency shutdown maintenance, causes heavy economic losses.Existing in the world large-size water-cooling generating set often has the report of this class accident.
Obviously, technology air cooling and water-cooled do not satisfy the cooling and the safety requirements of super-huge generating set now, must research and develop new coolant and cooling technology, and improve the reliability of safe operation.The evaporation cooling technique of the autonomous research and development of China was ripe already, can satisfy the requirement of Generator Set cooling technology fully.So-called evaporative cooling is that cooling liquid is poured in the electricity generator stator coil hollow conductor, utilizes the principle of liquid medium gasification heat absorption to come cooling motor.The coolant that evaporative cooling is selected for use has high insulation, low boiling, safe, nontoxic, stable properties.In order to improve evaporative cooling system, be necessary to develop condenser secondary cooling water leakage detector and be equipped with relevant components and parts, the assurance system safety is moved reliably.
Summary of the invention
The evaporation-cooled device that the purpose of this invention is to provide a kind of hydraulic generator stator winding, this device has been avoided destroying the major accident that the winding coil insulation causes short circuit because of coolant leaks fully, device provides condenser secondary cooling water leakage detector, be equipped with relevant components and parts, assurance device moves safely and reliably.
The evaporation-cooled device of hydraulic generator stator winding of the present invention is the totally-enclosed self-circulation system that an inside is filled with coolant.The generator unit stator winding is made of hollow conductor and solid conductor composition, it passes through upper end electricity liquid separating joint and lower end electricity liquid separating joint respectively in two ends up and down, connect upper end insulation skirt and lower end insulation skirt, last insulation skirt links to each other by the condensation space of discharge and condenser, following insulation skirt links to each other by the lower end of collector tube and liquid back pipe, and the upper end of liquid back pipe links to each other with the condensation space of condenser; Again by last endless tube whole needed many condensers of generator and connect, make many liquid back pipes and connect by collector tube.It is characterized in that being filled with in the totally-enclosed self-circulation system of coolant, every condenser is all installed the secondary cooling water leakage detector, two detecting electrode that is isolated from each other one ends of detector insert bottom, condenser metal can internal condensation space, the other end is drawn the back by the seal nipple on the tank body and is connected with external circuit, wherein goes back setting pressure transducer, pressure switch and vacuum solenoid valve on the tank body of a condenser.
The evaporation-cooled device of hydraulic generator stator winding of the present invention, its condenser is made of a metal can and a jar interior sealing metal tube bank.Tube bank import and export on the tank body outside seal nipple is drawn jar; Between metal can and the sealing metal tube bank enough condensation spaces are arranged.
Wherein one of the evaporation-cooled device of hydraulic generator stator winding, the liquid back pipe in its sealed circulation system was connected with magnetic float formula liquid level gauge by communicating pipe, and a pressure sensor is equipped with in the lower end of liquid level gauge.
In the evaporation-cooled device sealed circulation system of hydraulic generator stator winding, every condenser all is equipped with the cooling water leakage detector.Realize the leakage alarm of the interior secondary cooling water that flows of sealing metal tube bank in the condenser.
The evaporation-cooled device of hydraulic generator stator winding is a totally-enclosed circulatory system that is filled with an amount of coolant.The feature of its coolant is that electrical insulation properties is good, does not burn, and boiling temperature is spent between-60 degree 28, to the assembly copper conductor of the formation circulatory system, and electric liquid separating joint, insulation skirt and seal do not have the liquid of burn into stable performance compliance with environmental protection requirements.
The injection rate of cooling liquid can be determined with the demonstration of liquid level gauge.During design in the liquid level gauge cooling fluid height L determine by following computing formula:
L＝(P2-P1)/Q
Wherein: P2 is a pressure shown in the pressure sensor 9 of liquid level gauge lower end, and unit is g/cm
2,
P1 is a pressure shown in the condenser condenses space pressure transducer, and unit is g/cm
2,
Q is the proportion of cooling fluid, and unit is g/cm
3,
L is a cooling fluid degree height, and unit is cm.
During hydraulic generator stator winding evaporation-cooled device of the present invention operation, cooling fluid sealing and circulating and the intrafascicular mobile secondary cooling water of condenser sealed metal tube in system carry out complete heat exchange.For guaranteeing normal operation, do not allow the bleed condensation space of condenser of secondary cooling water.The invention provides the secondary cooling water leakage detector, its circuit theory is explanation in conjunction with the embodiments hereinafter for this reason.
Adopt hydraulic generator stator winding evaporation-cooled device of the present invention, has advantage with the same good cooling results of water-cooled unit, and because the coolant in the evaporative cooling self-circulation system has high insulating property, avoided the water-cooled unit the sort of again, thereby greatly improved operational reliability because of stator winding water leaks the danger of accident that is short-circuited.Moreover stator winding evaporative cooling medium circulation power is a difference in specific gravity of utilizing liquid phase and gas-liquid two-phase, realizes no pump self-loopa under action of gravity.This process is regulated automatically with the motor load size, makes the temperature rise approximately constant of winding, has reduced the thermal stress between winding copper conductor and the insulation, the useful life that helps improving motor windings.Adopt the motor windings evaporative cooling not need required water treatment of internal water cooling unit operation and circulating pump equipment in addition, saved investment and operating cost, simplified operational management.
In addition, secondary cooling water leakage detector provided by the invention guarantees that this device moves safely and reliably, and when the secondary cooling water in the condenser has micro-leakage, detector will provide alarm signal.
Description of drawings
Fig. 1 is the evaporation-cooled device structure principle chart of hydraulic generator stator winding.
Fig. 2 is the circuit theory diagrams of condenser secondary cooling water leakage detector.
Embodiment
Figure 1 shows that the evaporation-cooled device of a vertical hydrogenerator stator winding.Constitute stator winding 1 by hollow conductor and solid conductor, its upper end links to each other with the skirt 3 that upward insulate by electric liquid separating joint 2.Electricity liquid separating joint is a kind of fixture that insulation skirt and stator winding are tightly connected.Last insulation skirt 3 links to each other with discharge 5 by seal nipple 4, and discharge 5 links to each other with the condensation space of condenser 6 again.The condensation space of condenser 6 links to each other with liquid back pipe 7, and liquid back pipe 7 was connected with magnetic float formula liquid level gauge 8 by communicating pipe.Lower pressure sensor 9 is installed in the liquid level gauge lower end.The lower end of liquid back pipe 7 connects collector tube 10, and collector tube 10 connects insulation skirt 12 down by seal nipple 11.Following insulation skirt 12 links to each other with following electric liquid separating joint 13, and following electric liquid separating joint 13 links to each other with the lower end of stator winding 1.The top condensation space of condenser 6 is installed pressure sensor 14 outward, and another is drawn and takes over setting pressure switch 15 and vacuum solenoid valve 16.The detecting electrode 17 of secondary cooling water leakage detector also is housed, promptly puts in pair of electrodes T1, the T2 of condenser.Sealing metal tube bank 18 is equipped with in the inside of condenser 6, the circulate among secondary cooling water, and the import and export of tube bank 18 are drawn outside the jar through the seal nipple (not shown).Last endless tube 19 makes many condenser parallel connections.Hollow conductor in the winding 1, liquid back pipe 7, and with parts that it is communicated with in inject an amount of cooling liquid.
In the present embodiment, the coolant of selecting for use has high insulation, low Buddhist point, safe, nontoxic, stable properties, fluorocarbons for example, and its molecular formula is (C
2F
5)
3N, or HCFC-225 or C
3F
5HCl
2Or HFC-4310 or C
5H
2F
10
An example of secondary cooling water leak detection instrument circuit of the present invention, as shown in Figure 2.Connect DC power supply Vcc anode by the detecting electrode T1 that draws in the condenser through resistance R 1, detecting electrode T2 connects power supply negative terminal (promptly holding).The contact of detecting electrode T1 and resistance R 1 connects the inverting input of operational amplifier LM.Resistance R 2 is with after resistance R 3 is connected, and resistance R 2 connects power positive end, and resistance R 3 connects power supply negative terminal; The contact of resistance R 2 and R3 connects the normal phase input end of operational amplifier LM; The positive power source terminal of operational amplifier LM and negative power end connect power positive end and power supply negative terminal respectively, and resistance R 4 is connected between the normal phase input end and output of operational amplifier.The base stage of the output termination transistor TR1 of operational amplifier LM; The collector electrode of transistor TR1 connects power positive end, and emitter connects power supply negative terminal by resistance R 5.The emitter of transistor TR1 meets signal output part D, connects the base stage of transistor TR2 again by resistance R 6; The emitter of transistor TR2 connects power supply negative terminal by resistance R 7, and collector electrode connects power positive end by indicator light L1.
The operation principle of condenser secondary cooling water leakage instrument circuit of the present invention is: when the sealing tube bank of circulation secondary cooling water in the condenser is leaked, detecting electrode T1 in the condenser condensation space and the insulation resistance step-down between the T2, when the current potential of operational amplifier LM inverting input was lower than voltage on the normal phase input end that is set by resistance R 2 and R3 dividing potential drop, the output of operational amplifier transferred high level to by low level.4 accelerations of resistance R are leaked the signal is far passed to generating set Surveillance center by signal output part D handle, transistor TR2 conducting simultaneously, and alarm lamp L1 lights.
Its course of work of the evaporation-cooled device of hydraulic generator stator winding is: the cooling liquid in hollow conductor in the winding absorbs the heat that conductor losses produced and vaporizes gradually, form gas phase and liquid phase fluid mixture, its density is lower than the density of single-phase liquid in the liquid back pipe, under action of gravity, produce flow head, overcome the loop resistance, keep systemic circulation.The two-phase fluid of gas phase and liquid-phase mixing flows to the secondary cooling water that flows in the condensation space of condenser and the tube bank of condenser inner sealing and carries out heat exchange, and cooling fluid gas is condensed into liquid and flows into liquid back pipe again.This process is regulated automatically with the motor load size, and loss strengthened when promptly motor load increased, and the cooling fluid amount of vaporization is also along with increase, make the density of gas-fluid two-phase mixture become lower, cause flow head to increase, circulation is accelerated, take away more heat, thereby keep the winding temperature approximately constant.The upward pressure transducer 14 reflection condenser condenses space pressure of installing on the condenser are controlled vacuum solenoid valve 16 to regulate the coolant evaporating temperature with its.Pressure switch 15 detection alarm pressure are directly controlled vacuum solenoid valve 16 and are reduced the condenser condenses space pressure, guarantee safe operation.The magnetic float formula liquid level gauge 8 that connects on the liquid back pipe 7 can show the liquid level of coolant in the airtight cooling recirculation system intuitively.The lower pressure sensor 9 that install liquid level gauge 8 lower ends becomes signal of telecommunication teletransmission to liquid level to unit Surveillance center jointly with the upward pressure transducer 14 that is installed in condenser top condensation space.
Claims (4)
1. the evaporation-cooled device of a hydraulic generator stator winding, it is the totally-enclosed self-circulation system that is filled with coolant, the generator unit stator winding is combined by hollow conductor and solid conductor, and the two ends up and down of stator winding are connected insulation skirt and following insulation skirt by upper end electricity liquid separating joint with lower end electricity liquid separating joint respectively; Last insulation skirt links to each other by the condensation space of discharge and condenser, and following insulation skirt links to each other with the lower end of liquid back pipe by collector tube, and the upper end of liquid back pipe links to each other with the condensation space of condenser; Again by last endless tube whole needed many condensers of generator and connect, make many liquid back pipes and connect by collector tube, it is characterized in that being filled with in the totally-enclosed self-circulation system of coolant, every condenser is all installed the secondary cooling water leakage detector, two detecting electrode that is isolated from each other one ends of detector insert bottom, condenser metal can internal condensation space, the other end is drawn the back by the seal nipple on the tank body and is connected with external circuit, wherein goes back setting pressure transducer, pressure switch and vacuum solenoid valve on the tank body of a condenser.
2. the evaporation-cooled device of hydraulic generator stator winding according to claim 1, the circuit that it is characterized in that the secondary cooling water leakage detector is such, connect DC power supply Vcc anode by the detecting electrode T1 that draws in the condenser through resistance R 1, detecting electrode T2 connects power supply negative terminal, promptly hold, the contact of detecting electrode T1 and resistance R 1 connects the inverting input of operational amplifier LM; Resistance R 2 is with after resistance R 3 is connected, and resistance R 2 connects power positive end, and resistance R 3 connects power supply negative terminal; The contact of resistance R 2 and R3 connects the normal phase input end of operational amplifier LM; The positive power source terminal of operational amplifier LM and negative power end connect power positive end and power supply negative terminal respectively, and resistance R 4 is connected between the normal phase input end and output of operational amplifier, the base stage of the output termination transistor TR1 of operational amplifier LM; The collector electrode of transistor TR1 connects power positive end, and emitter connects power supply negative terminal by resistance R 5; The emitter of transistor TR1 meets signal output part D, connects the base stage of transistor TR2 again by resistance R 6; The emitter of transistor TR2 connects power supply negative terminal by resistance R 7, and collector electrode connects power positive end by indicator light L1.
3. the evaporation-cooled device of hydraulic generator stator winding according to claim 1, it is characterized in that described liquid back pipe wherein one be connected with magnetic float formula liquid level gauge by communicating pipe, a lower pressure sensor is equipped with in the lower end of liquid level gauge.
4. the evaporation-cooled device of hydraulic generator stator winding according to claim 3 is characterized in that the height L of cooling fluid in the liquid level gauge is determined by following computing formula:
L＝(P2-P1)/Q
In the formula: P2 is a pressure shown in the pressure sensor of liquid level gauge lower end, and unit is g/cm
2,
P1 is a pressure shown in the condenser condenses space pressure transducer, and unit is g/cm
2,
Q is the proportion of cooling fluid, and unit is g/cm
3,
L is the cooling fluid height, and unit is cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011313994A CN1186872C (en) | 2001-10-31 | 2001-10-31 | Evaporative cooling equipment of stator winding of hydraulic generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011313994A CN1186872C (en) | 2001-10-31 | 2001-10-31 | Evaporative cooling equipment of stator winding of hydraulic generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1416202A CN1416202A (en) | 2003-05-07 |
| CN1186872C true CN1186872C (en) | 2005-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011313994A Expired - Fee Related CN1186872C (en) | 2001-10-31 | 2001-10-31 | Evaporative cooling equipment of stator winding of hydraulic generator |
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| Country | Link |
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| CN (1) | CN1186872C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1841885B (en) * | 2005-03-29 | 2010-10-27 | 中国科学院电工研究所 | Self-circulation cooling loop of heavy current fixture wire |
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| CN1293691C (en) * | 2003-11-14 | 2007-01-03 | 中国科学院电工研究所 | Forced circulation evaporation cooling device of hydraulic generator stator |
| CN100521454C (en) * | 2004-12-31 | 2009-07-29 | 中国科学院电工研究所 | Evaporating and cooling system monitoring and protection controlling device for generator stator |
| CN100521448C (en) * | 2005-11-04 | 2009-07-29 | 中国科学院电工研究所 | Transpiration-cooled wind driven generator stator |
| CN1967978B (en) * | 2005-11-15 | 2010-09-29 | 东方电机股份有限公司 | Evaporation cooling combined cycle device of hydraulic generator stator |
| CN101183808B (en) * | 2007-11-16 | 2010-04-07 | 中国科学院电工研究所 | Stator structure of inner cooling type self-circulation vaporization cooling wind power generator |
| CN101615331B (en) * | 2008-06-26 | 2011-04-20 | 上海梅山钢铁股份有限公司 | Water leakage alarm device for generator |
| CN102055283A (en) * | 2011-01-18 | 2011-05-11 | 北京鹏发欣光电力电子科技有限公司 | Evaporation cooling permanent magnet motor |
| CN102510172A (en) * | 2011-11-21 | 2012-06-20 | 哈尔滨电机厂有限责任公司 | Secondary cooling system for hydraulic generator |
| CN102969838B (en) * | 2012-10-31 | 2014-08-27 | 中国科学院电工研究所 | Forced circulation evaporation cooling device of hydro-generator stator busbar |
| DE102014011026B4 (en) * | 2014-07-24 | 2016-10-27 | Audi Ag | Connecting device and electric machine |
| CN107947402A (en) * | 2017-11-21 | 2018-04-20 | 中国航发沈阳发动机研究所 | Motor stator cooling structure and there is its more electric engin |
| CN111025138B (en) * | 2019-12-16 | 2021-08-20 | 华为技术有限公司 | Detection device and server |
| CN111454781A (en) * | 2020-03-25 | 2020-07-28 | 苏州神尔能源科技有限公司 | High-insulation mixed liquid capable of being used for cleaning high-voltage power equipment |
-
2001
- 2001-10-31 CN CNB011313994A patent/CN1186872C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1841885B (en) * | 2005-03-29 | 2010-10-27 | 中国科学院电工研究所 | Self-circulation cooling loop of heavy current fixture wire |
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| CN1416202A (en) | 2003-05-07 |
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Granted publication date: 20050126 Termination date: 20191031 |