CN201072686Y - Intelligent control device of transformer refrigerating mechanism - Google Patents
Intelligent control device of transformer refrigerating mechanism Download PDFInfo
- Publication number
- CN201072686Y CN201072686Y CNU2007200239130U CN200720023913U CN201072686Y CN 201072686 Y CN201072686 Y CN 201072686Y CN U2007200239130 U CNU2007200239130 U CN U2007200239130U CN 200720023913 U CN200720023913 U CN 200720023913U CN 201072686 Y CN201072686 Y CN 201072686Y
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- cooler
- transformer
- programmable logic
- logic controller
- relay
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- 238000001816 cooling Methods 0.000 claims abstract description 27
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- 238000004364 calculation method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
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- 238000010586 diagram Methods 0.000 description 5
- 238000010835 comparative analysis Methods 0.000 description 4
- 230000008034 disappearance Effects 0.000 description 4
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- 238000004458 analytical method Methods 0.000 description 3
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 206010020843 Hyperthermia Diseases 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000010724 circulating oil Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000036031 hyperthermia Effects 0.000 description 1
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Abstract
An intelligent control device for the cooling device of transformer is provided, which belongs to the intelligent control for the cooling device of economical transformer operation. The device comprises a cooler and a transformer, which is characterized in that: the utility model also comprises a programmable controller U1, a temperature tester U2, a current tester U3 and a monitor for cooler status. The temperature tester U2, the current tester U3 and the monitor for cooler status are separately connected with the input terminal of the programmable controller U1. The output terminal of the programmable controller U1 is connected with a starting relay J1. The contact J1-1 of the starting relay J1, the coil of the electromotor starting contactor J2 and the fuse plug U2 are connected in series on the DC power supply. The device has the advantages of intelligent control to the linear input or stop of the cooling device, precise control to the operation of the cooling device of the transformer, saving large amount of the energy, etc.
Description
Technical field
The utility model relates to a kind of transformer cooling device intelligence controlling device, belongs to the intelligent control technology of the cooling device of supply transformer economical operation.
Background technology
Power transformer is as the electric equipment of electric power system and numerous enterprise customers' extensive use, the contact electrical network, is the voltage transitions of supply network the voltage that power consumption equipment or device directly use, and is bringing into play the core key effect in electric power conveying, distribution and use; In actual moving process,, mainly be load loss, no-load loss because the existence of the mobile and electromagnetic field of each coil-conductor electric current can produce electric energy loss; Though the efficient of power transformer is very high, now the efficient of Yun Hang power transformer is generally all more than 99%, but transformer is because the power of conversion is big, the loss that produces is also just very objective, it is tens of to hundreds of kilowatt that the large-scale power transformer own loss often can reach, and these losses all will convert powerful heat energy to raises the temperature at each position of transformer in various degree.Cause insulating material aging useful life of accelerating to shorten transformer for preventing that the transformer operating temperature is too high, prevent the damage accident that transformer causes because of hyperthermia and superheating, must take the additional heat measure, the type of cooling of radiator being dried by fan electromotor is an oil-immersed forced-air cool; In large-scale power transformer iron core and winding oil flow channel being set, installing oil pump in circulating oil path, is forced oil and forced air cooled type by the type of cooling that heat is taken out of that flows of quickening oil; At present, the type of cooling of 220kV electric pressure of moving in the electric power system and the above transformer of 63MW capacity is most of to be forced oil and forced air cooled type, 110kV electric pressure and the following transformer of 63MW capacity mostly are oil-immersed forced-air cool, they are by increasing area of dissipation on cooler, the dress fan improves radiating rate on cooler, and increase the circulation rate that oil pump is accelerated deep fat, to improve the radiating efficiency of transformer, the operating temperature of coming control transformer; Oil-immersed forced-air cool and forced oil and forced air cooled type cooler the time also will consume certain power in operation, and the power of the size of its consumed power and oil pump and fan electromotor, the quantity that puts into operation are closely related.To same transformer of same service conditions, the power that drops into cooling device is big, and the operating temperature of himself is corresponding will to be reduced, and the loss of transformer can reduce again, and the temperature at each position also can reduce; At present the control model of cooling device is that to be no more than limiting temperature (or the temperature of adjusting) with the control transformer operating temperature be strategy, the branch that " standby " and " assisting " arranged, do not give full play to the effect of all coolers, temperature not being reduced the consumed power value cause the minimizing value of transformer resistance loss power and to reduce the required cooling device of this temperature compares, do not carry out the comparative analysis of safety economy technology, the quantity that exists cooling device to drop into is too much or very few, power transformer composite loss power height, cause and waste energy, high temperature, high load condition transformer temperature is too high, influences the safe operation of transformer.
The utility model content
For overcoming above deficiency of the prior art, problem to be solved in the utility model is: provide a kind of can the Based Intelligent Control cooling device the linearity input or stop, in the hope of the transformer cooling device intelligence controlling device that can realize that accurately control and optimal economic are moved.
The technical scheme that its technical problem that solves the utility model adopts is: this transformer cooling device intelligence controlling device, comprise cooler and transformer, it is characterized in that: also comprise Programmable Logic Controller U1, Temperature Detector U2, current detector U3 and cooler state monitor, Temperature Detector U2, current detector U3 and cooler state monitor are connected the input of Programmable Logic Controller U1 respectively, the output of Programmable Logic Controller U1 connects starting relay J1, the contact J1-1 of starting relay J1, coil and the fuse FU1 of electric motor starting contactor J2 are connected on the DC power supply.
The cooler state monitor comprises electric motor starting contactor J2, thermal relay and oil flow relay, a contact J2-1 of electric motor starting contactor connects the input of Programmable Logic Controller U1, another contact J2-2 is arranged on the main power source circuit of cooler motor M1, thermal relay contact J3-1 connects the input of Programmable Logic Controller U1, and the contact J4-1 of oil flow relay connects the input of Programmable Logic Controller U1.
The cooler state monitor is arranged on respectively to be organized on the cooler, Temperature Detector U2 is arranged on transformer oil bag top layer, current detector U3 is arranged on the Current Transformer Secondary coil of each side of power transformer, thermal relay is arranged near the cooler motor M1, and oil flow relay is arranged on the cooler oil pipe.The effect of cooler state monitor is to monitor the various running statuses of cooler, when abnormality or operation occurring, can handle with signal conveys to Programmable Logic Controller.
Described Programmable Logic Controller panel adopts touch-screen as man-machine interface, realizes control automation, state informationization, demonstration and user-friendly for operation.Can enter the parameter setting by password, input transformer capacity and loss parameter, the warm limit value of upper strata oil of adjusting, the gentle coil temperature compensation of oil is revised, and revises the cooler operational mode, cooler full cut-off tripping operation delay time, the high oil temperature of cooler full cut-off tripping operation delay time, operational mode changes the time automatically, the automatic rotation time of two-way electrical source of power, information such as failure logging.
The operation principle of this transformer cooling device intelligence controlling device, utilize Programmable Logic Controller, gather the oil temperature of power transformer signal, gather each inlet wire side of power transformer and outlet side current signal and respectively organize the cooler operating state signal, oil temperature signal, current signal and status signal are carried out calculation process, according to the calculation process result, the stopping and moving of control cooler.
By Programmable Logic Controller the different structure type of transformer, different zero loads are carried out data pacing voluntarily with load loss parameter, different temperature rise requirements, different cooling device configuring conditions, in conjunction with economic technology relatively, guarantee that the composite loss power of operating transformer under any load and ambient temperature reaches floor level.
Gathering the oil temperature of power transformer signal is transformer top-oil temperature t of collection in per 30 minutes.
Gather each side current signal of power transformer and be on the Current Transformer Secondary coil by each side of power transformer and obtain the current value I that each side of transformer is passed through.Be used for the control of cooler switching state.
The cooler operating state signal comprises the cooler fault-signal, the Cooler Power signal.
Calculation process comprises temperature calculation process and cooler signal processing.
The temperature calculation process is according to R
2=R
1(T+t
2)/(T+t
1) and Δ P=I
2(R
2-R
1) formula, after calculating operation in real time or stopping one group of cooler, the transformer temperature is by t
1Change to t
2The changing value of the coil power loss that causes, and will be worth and the real-time comparative analysis of consumed power of this group cooler, carry out economic technology relatively, the linearity of control cooler puts into operation or stops, and wherein Δ P is a variable power, t
1Oil temperature for operation or before stopping one group of cooler, t
2Oil temperature for operation or after stopping one group of cooler, R
1Move or stop the resistance of the preceding transformer coil of one group of cooler, R
2For moving or stop the resistance of one group of transformer coil behind the cooler, T is a constant.
The cooler signal processing comprises: if any one group of fault is arranged in the operating cooler, then another group cooler is put into operation, send " cooler fault " distant signal simultaneously, show the particular content of cooler fault nearby; Cooler Power disappearance and all coolers are out of service, and send " cooler full cut-off fault " distant signal this moment, shows the particular content of cooler full cut-off fault nearby; When cooler one power supply or the disappearance of two power supplys, start stand-by power supply and drop into function automatically, send " power failure " or " two power failures " distant signal, show the particular content of fault nearby, failure logging is retained.
If one group of fault is arranged in the operating cooler, as thermal relay action, oil flow relay is not worked or the action of cooler circuit breaker, another group cooler puts into operation.Send " cooler fault " distant signal simultaneously, show the particular content of cooler fault nearby.If fault restoration, fault-signal disappears, and failure logging is retained.Cooler Power disappearance and all coolers are out of service, and send " cooler full cut-off fault " distant signal this moment, shows the particular content of cooler full cut-off fault nearby.Strong oily circulating transformer is started 20 minutes and delay tripping timing in 60 minutes, can realize when main transformer upper strata oil temperature signal reaches 70 degree (user's setting value), tripping operation outlet after 20 minutes; When main transformer upper strata oil temperature signal is lower than 70 degree (user's setting value), jump after 60 minutes.When cooler one power supply or the disappearance of two power supplys, start stand-by power supply and drop into function automatically, send " power failure " or " two power failures " distant signal, show the particular content of fault nearby, failure logging is retained.The operational mode of time in turn cooler, cooler input and stop and can redistributing is to improve the whole service life of cooler fan and oil pump.
The beneficial effects of the utility model are, by requiring and different cooling device configuring conditions at the different structure form of transformer, different zero load and load loss parameters and different temperature rises, by Programmable Logic Controller calculate drop into and stop one group of cooler after the transformer temperature by t
1Change to t
2The changing value of the coil power loss that causes, and will be worth and the real-time comparative analysis of consumed power of this group cooler, carry out economic technology relatively after, the linearity input of Based Intelligent Control cooling device or stop to guarantee that the composite loss power of operating transformer under any load and ambient temperature reaches floor level.Can realize that accurately control and optimal economic move, save a large amount of energy, have simultaneously simple in structure, advantage such as cost is low, and is easy to make.
Description of drawings
Fig. 1 is embodiment 1 circuit theory diagrams of the present utility model;
Fig. 2 is the electrical principle logic diagram of embodiment 1;
Fig. 3 is the control method flow chart of embodiment 1;
Fig. 4 is embodiment 2 circuit theory diagrams.
Fig. 1-the 3rd, most preferred embodiment of the present utility model is among Fig. 1-4: U1 Programmable Logic Controller U2 Temperature Detector U3 current detector J1 starting relay J1-1 starting relay contact J2 electric motor starting contactor J2-1, J4-1 oil flow relay contact, J2-2 electric motor starting contacts of contactor J3-1 thermal relay contact M1 cooler motor FU1 fuse.
Embodiment
Below in conjunction with accompanying drawing 1-4 embodiment of the present utility model is described further:
Embodiment 1:
As shown in Figure 1, circuit theory diagrams specify as follows:
This control device, comprise Programmable Logic Controller U1, Temperature Detector U2, current detector U3 and cooler state monitor, Temperature Detector U2, current detector U3 and cooler state monitor, the input that connects Programmable Logic Controller U1 respectively, the output of Programmable Logic Controller U1 connects starting relay J1, and coil and the fuse FU1 of the contact J1-1 of starting relay J1, electric motor starting contactor J2 are connected on the DC power supply.
The cooler state monitor comprises electric motor starting contactor J2, thermal relay and oil flow relay, a contact J2-1 of electric motor starting contactor connects the input of Programmable Logic Controller U1, and another contact J2-2 is arranged on the main power source circuit of cooler motor M1.Thermal relay contact J3-1 connects the input of Programmable Logic Controller U1, and the contact J4-1 of oil flow relay connects the input of Programmable Logic Controller U1.
The cooler state monitor is arranged on respectively to be organized on the cooler.Temperature Detector U2 is arranged on transformer oil bag top layer.Current detector U3 is arranged on the Current Transformer Secondary coil of each side of power transformer.Thermal relay is arranged near the cooler motor M1.Oil flow relay is arranged on the cooler oil pipe.
Programmable Logic Controller can connect and control many group coolers as required.
As shown in Figure 2, electrical principle logic diagram of the present utility model illustrates with the forced oil and forced air cooled type cooler.
At first gather oil temperature of power transformer signal, each side current signal of power transformer and respectively organize the cooler operating state signal, oil temperature signal, current signal and status signal are carried out calculation process, calculate comparative analysis, the result gives an order according to calculation process, the action of control cooler control loop is stopped and being moved certain group cooler by the cooler control loop.Each organizes the cooler operating state signal, after handling through state analysis, sends fault-signal.
Programmable Logic Controller obtains the current value that coil passes through from the current transformer of each side of power transformer, gets transformer top-oil temperature signal from the thermometer lead-out terminal, according to R
2=R
1(T+t
2)/(T+t
1) and Δ P=I
2(R
2-R
1) formula, (generally can sample in per 2 hours and calculate once) transformer temperature is by t after calculating input in real time and stopping one group of cooler
1Change to t
2The changing value of the coil power loss that causes.Wherein Δ P is a variable power, t
1Oil temperature for operation or before stopping one group of cooler, t
2Be the oil temperature for operation or after stopping one group of cooler, R
1Move or stop the resistance of the preceding transformer coil of one group of cooler, R
2For being operation or the resistance that stops one group of transformer coil behind the cooler, T uses constant, copper conductor to get 235 for calculating, and aluminum conductor gets 225.
The consumed power of above-mentioned value and this group cooler is analyzed, cause that less than the temperature reduction reduction value of transformer resistance loss is (for preventing frequent movement if drop into the power of cooler, it is 2 times cooler power that this value can be adjusted), then programmable controller sends the instruction that drops into one group of cooler, otherwise excise one group of cooler, do not reach the definite value Programmable Logic Controller and do not send input or excision order.
The action of cooler control loop should be organized cooler input or out of service, improved or slow down the cooling rate to transformer in service.
Programmable Logic Controller by gathering cooler the actuating of relay or oil flow relay is not worked or the position signalling of cooler circuit breaker, its state of analysis and judgement if its power supply or motor status are unusual, then sends the failure exception signal.
By Programmable Logic Controller self-timing (time of the adjusting voluntarily) operational mode of cooler by turns, cooler input and stop and can redistributing is to improve the whole service life of cooler fan and oil pump.
According to the temperature signal and the load current analysis of transformer,, guarantee that power transformer cooling device when hot operation can all drop into by the requirement of " DL/T572--95 power transformer operating standard ".The control panel of Programmable Logic Controller adopts touch-screen as man-machine interface, can pass through password setting transformer capacity and loss parameter, the warm limit value of upper strata oil of adjusting, carrying out oily gentle coil temperature compensation revises, modification cooler operational mode, cooler full cut-off tripping operation delay time, the high delay time that trips of cooler full cut-off oil temperature, operational mode change time and the automatic rotation time of two-way electrical source of power, information such as report failure logging automatically.
As shown in Figure 3, control method flow chart of the present utility model specifies as follows.
1, after the system start-up, at first carry out self check, the self check mistake provides fault-signal, and the signals such as operating state of transformer temperature, each lateral load situation, each radiator are gathered in the normal back of self check.
2, according to the signal that collects, when spending greater than 55, the transformer temperature drops into all radiators, otherwise, Current Temperatures is changed to initial temperature t
0, and the circle collection data.
3, when the transformer variations in temperature to t
1, and the temperature difference | t
1-t
0|＞t
zWhen (can adjust), according to main transformer temperature variations input or withdraw from certain the group cooler, delay time after 2 hours, according to the temperature t that reaches
2The power loss Δ P that calculating transformer changes.
4, if Δ P organizes the consumed power P of radiator greater than list
0Twice, then drop into one group of radiator again.Delay time after 2 hours, the power loss Δ P that the double counting transformer changes is up to the consumed power P of Δ P less than single group radiator
0Till, finish whole control process.
The course of work: the operating state of transformer cooler, mainly comprise the action behavior of electric motor starting contactor J2, thermal relay, oil flow relay, directly the form with idle contact inserts Programmable Logic Controller U1.Transformer temperature signal and current signal after process Temperature Detector U2 and current detector U3 are converted to digital signal, insert Programmable Logic Controller U1 by serial communication interface.Programmable Logic Controller U1 is through intelligent decision, by starting relay J1 output control signal, through the startup of electric motor starting contactor J2 control transformer cooler motor M1 with stop.
Embodiment 2:
As shown in Figure 4,
Programmable Logic Controller U1 can adopt the PLC programmable logic controller (PLC) of the PZK-100 type of Shandong Kehui Electric Co., Ltd.'s production, can control simultaneously and gather a plurality of current signals, temperature signal, cooler status signal, Cooler Power, oil pump state signal and tranformer protection relay signal.Introduce a kind of occupation mode below: this PLC programmable logic controller (PLC) has 9 road ac analog inputs (AC1-AC9) and 2 road DC analogue quantity inputs (DC1-DC2), can be used to insert DC quantity such as the ac flow of current transformer conversion of high, medium and low three sides of on-the-spot power transformer and temperature of oil in transformer.The concrete position of inserting is: the AC1-AC3 termination is gone into Ia, the Ib of transformer high-voltage side, the three-phase electricity flow of Ic; The AC4-AC6 termination is gone into Ia, the Ib of transformer medium voltage side, the three-phase electricity flow of Ic; The AC7-AC9 termination is gone into Ia, Ib, the Ic three-phase electricity flow of step down side; The DC1 termination is gone into the direct current signal of transformer oil temperature sensor.
12 way word switch amount input DI1-DI12 of this PLC programmable logic controller (PLC) are respectively applied for: the DI1 end is used to insert transformer thermal relay status signal; The DI2 termination is gone into the oil flow relay status signal; The DI3 termination is gone into the oil pump state signal; The DI4 termination is gone into tranformer protection relay status signal; The DI5 termination is gone into cooler 1 power supply signal; The DI6 termination is gone into cooler 2 power supply signals; The DI7-DI12 termination is gone into 1#-6# cooler fan condition signal.
8 way word switch amount output D01-8 of this PLC programmable logic controller (PLC) are respectively applied for to connect and carry out relay coil, and its effect can be set to: D01-D06 end and the relay that connects are used to control the start and stop of 1#-6# cooler blower fan; D07 end and the relay that connects are used for the switching of cooler main power source and stand-by power supply; D08 end and the relay that connects are used for the high, medium and low switch trip of transformer three sides.
Claims (4)
1. transformer cooling device intelligence controlling device, comprise cooler and transformer, it is characterized in that: also comprise Programmable Logic Controller U1, Temperature Detector U2, current detector U3 and cooler state monitor, Temperature Detector U2, current detector U3 and cooler state monitor are connected the input of Programmable Logic Controller U1 respectively, the output of Programmable Logic Controller U1 connects starting relay J1, and coil and the fuse FU1 of the contact J1-1 of starting relay J1, electric motor starting contactor J2 are connected on the DC power supply.
2. transformer cooling device intelligence controlling device according to claim 1, it is characterized in that: the cooler state monitor comprises electric motor starting contactor J2, thermal relay and oil flow relay, a contact J2-1 of electric motor starting contactor connects the input of Programmable Logic Controller U1, another contact J2-2 is arranged on the main power source circuit of cooler motor M1, thermal relay contact J3-1 connects the input of Programmable Logic Controller U1, and the contact J4-1 of oil flow relay connects the input of Programmable Logic Controller U1.
3. transformer cooling device intelligence controlling device according to claim 1, it is characterized in that: the cooler state monitor is arranged on respectively to be organized on the cooler, Temperature Detector U2 is arranged on transformer oil bag top layer, current detector U3 is arranged on the Current Transformer Secondary coil of each side of power transformer, thermal relay is arranged near the cooler motor M1, and oil flow relay is arranged on the cooler oil pipe.
4. transformer cooling device intelligence controlling device according to claim 1 is characterized in that: Programmable Logic Controller U1 is provided with control panel and adopts touch-screen as man-machine interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200239130U CN201072686Y (en) | 2007-06-14 | 2007-06-14 | Intelligent control device of transformer refrigerating mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200239130U CN201072686Y (en) | 2007-06-14 | 2007-06-14 | Intelligent control device of transformer refrigerating mechanism |
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| Publication Number | Publication Date |
|---|---|
| CN201072686Y true CN201072686Y (en) | 2008-06-11 |
Family
ID=39551243
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200239130U Expired - Fee Related CN201072686Y (en) | 2007-06-14 | 2007-06-14 | Intelligent control device of transformer refrigerating mechanism |
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| Country | Link |
|---|---|
| CN (1) | CN201072686Y (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325117B (en) * | 2007-06-14 | 2011-04-27 | 咸日常 | Intelligent control method for transformer cooling device based on temperature control and apparatus thereof |
| CN102508506A (en) * | 2011-12-10 | 2012-06-20 | 咸日常 | Intelligent electrical equipment indoor environment temperature control method based on temperature difference and device thereof |
| CN104460744A (en) * | 2014-11-13 | 2015-03-25 | 长沙慧林机电科技有限公司 | Cooling control method and cooling control system of large-capacity transformer |
| CN109582061A (en) * | 2018-12-14 | 2019-04-05 | 中广核工程有限公司 | Nuclear power station temperature control device for dry transformer |
| CN109814633A (en) * | 2017-11-20 | 2019-05-28 | 国网内蒙古东部电力有限公司电力科学研究院 | A kind of extra-high voltage transformer cooler control circuit and its control method |
| CN111141982A (en) * | 2020-01-02 | 2020-05-12 | 中车青岛四方机车车辆股份有限公司 | Traction transformer oil flow abnormal fault detection device and method |
| CN111337744A (en) * | 2020-04-03 | 2020-06-26 | 苏州华电电气股份有限公司 | Transformer operation energy efficiency and/or loss monitoring device |
| CN112938962A (en) * | 2021-02-06 | 2021-06-11 | 河南万贯实业有限公司 | Circulating power transmission graphitization furnace with large and small rectifier transformers |
| CN120490642A (en) * | 2025-05-21 | 2025-08-15 | 四川华电内江燃气发电有限公司 | Front end detection circuit of box-type transformer |
-
2007
- 2007-06-14 CN CNU2007200239130U patent/CN201072686Y/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325117B (en) * | 2007-06-14 | 2011-04-27 | 咸日常 | Intelligent control method for transformer cooling device based on temperature control and apparatus thereof |
| CN102508506A (en) * | 2011-12-10 | 2012-06-20 | 咸日常 | Intelligent electrical equipment indoor environment temperature control method based on temperature difference and device thereof |
| CN102508506B (en) * | 2011-12-10 | 2013-11-06 | 山东德佑电气有限公司 | Intelligent electrical equipment indoor environment temperature control method based on temperature difference |
| CN104460744A (en) * | 2014-11-13 | 2015-03-25 | 长沙慧林机电科技有限公司 | Cooling control method and cooling control system of large-capacity transformer |
| CN109814633A (en) * | 2017-11-20 | 2019-05-28 | 国网内蒙古东部电力有限公司电力科学研究院 | A kind of extra-high voltage transformer cooler control circuit and its control method |
| CN109814633B (en) * | 2017-11-20 | 2024-05-31 | 国网内蒙古东部电力有限公司电力科学研究院 | A UHV transformer cooler control circuit and control method thereof |
| CN109582061A (en) * | 2018-12-14 | 2019-04-05 | 中广核工程有限公司 | Nuclear power station temperature control device for dry transformer |
| CN111141982A (en) * | 2020-01-02 | 2020-05-12 | 中车青岛四方机车车辆股份有限公司 | Traction transformer oil flow abnormal fault detection device and method |
| CN111337744A (en) * | 2020-04-03 | 2020-06-26 | 苏州华电电气股份有限公司 | Transformer operation energy efficiency and/or loss monitoring device |
| CN112938962A (en) * | 2021-02-06 | 2021-06-11 | 河南万贯实业有限公司 | Circulating power transmission graphitization furnace with large and small rectifier transformers |
| CN112938962B (en) * | 2021-02-06 | 2021-11-19 | 平顶山东方碳素股份有限公司 | Circulating power transmission graphitization furnace with large and small rectifier transformers |
| CN120490642A (en) * | 2025-05-21 | 2025-08-15 | 四川华电内江燃气发电有限公司 | Front end detection circuit of box-type transformer |
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