CN106545513B - A kind of change of current cooler control method - Google Patents
A kind of change of current cooler control method Download PDFInfo
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- CN106545513B CN106545513B CN201610963202.5A CN201610963202A CN106545513B CN 106545513 B CN106545513 B CN 106545513B CN 201610963202 A CN201610963202 A CN 201610963202A CN 106545513 B CN106545513 B CN 106545513B
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- 230000008859 change Effects 0.000 title claims abstract description 65
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- 230000005540 biological transmission Effects 0.000 claims abstract description 44
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 230000001960 triggered effect Effects 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 description 14
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- 238000003860 storage Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 2
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- 238000000518 rheometry Methods 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
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- General Engineering & Computer Science (AREA)
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
A kind of change of current cooler control method proposed by the present invention, change of current cooler are applied in one-tower double-circuit DC transmission system, and one-tower double-circuit DC transmission system includes PLC control modules, and this method includes：Judge that the change of current becomes default fault condition whether occur；If so, the control command for representing excision cooler is then sent to cooler；And then detect the control command whether cooler receives excision cooler；Differential unblock button is triggered according to first scheduled time if control command is received；Differential unblock button is triggered according to second scheduled time, cooler automatic start on the spot is controlled by PLC control modules.Then the present invention realizes different control logics, meets the requirement that the change of current in one-tower double-circuit DC transmission system becomes cooling performance by judging that the change of current becomes default fault condition whether occur.
Description
Technical field
The present invention relates to electric power energy field, more particularly to a kind of change of current cooler control method.
Background technology
The country ± 500kV current conversion stations change of current cooler wind turbine uses PLC frequency control mostly at present, by by transformer
The analog quantitys such as oil temperature, bypass temperature and load current are converted into digital quantity input PLC logical programs, this series analog amount is passed through
4-20mA current signals will be exported after the processing of logical program to frequency conversion fan, frequency conversion fan can control after receiving current signal
Rotation speed of fan is maintained at zone of reasonableness class, can meet the requirement of transformer cooler cooling performance and appropriate energy saving.
Domestic change of current cooler air cooler control system logical program control is mainly controlled using PLC logical programs, but by
There is special performance requirement in super-pressure, bulk power grid, long range systems exchange rheology cooling system, in addition domestic direct current now
The cooling performance of transmission system mode diversification exchange rheology also not to the utmost, such as：In multi-terminal direct current transmission system, back-to-back
Cooler performance is different from DC transmission system, one-tower double-circuit DC transmission system, flexible direct current power transmission system, but
Often copied slavishly during redesign, used PLC program in conventional DC transmission engineering is read according to the copy for new
In DC transmission system, this will cause the change of current to become cooling performance cannot meet the requirements to a certain extent.
The content of the invention
Embodiments of the present invention are intended at least solve one of technical problem existing in the prior art.It is for this reason, of the invention
Embodiment need to provide a kind of change of current cooler control method.
A kind of change of current cooler control method proposed by the present invention, the change of current cooler are applied straight in common-tower double-return
Flow in transmission system, the one-tower double-circuit DC transmission system includes PLC control modules, the new change of current cooler controlling party
Method comprises the following steps：
Judge that the change of current becomes default fault condition whether occur；
If the determination result is YES, then the control command for representing excision cooler is sent to cooler；
Whether detection cooler receives the control command of excision cooler；
If cooler receives the control command of excision cooler, pressed according to the differential unlock of first scheduled time triggering
Button；
Differential unblock button is triggered according to second scheduled time, controls cooler to open automatically on the spot by PLC control modules
It is dynamic.
A kind of change of current cooler control method of embodiment of the present invention, by judging it is default whether change of current change occurs
Fault condition, then realizes different control logics, and cooler control is cut off after specially breaking down, then passes through differential solution
Lock realizes involution differential wave, the control program in PLC control modules is finally realized that automatic start cools down into ready state
The result of device.
The advantages of additional aspect of the present invention, will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of embodiments of the present invention are from accompanying drawings below is combined to embodiment
It will be apparent and be readily appreciated that in description, wherein：
Fig. 1 is a kind of flow diagram of change of current cooler control method of embodiment of the present invention；
Fig. 2 is a kind of PLC control schematic diagrams of change of current cooler control method of embodiment of the present invention；
Fig. 3 is that automatic mold on the spot is realized in a kind of PLC controls of change of current cooler control method of embodiment of the present invention
Formula schematic diagram；
Fig. 4 is that automatic mold on the spot is realized in a kind of PLC controls of change of current cooler control method of embodiment of the present invention
Start the schematic diagram of wind turbine after formula；
Fig. 5 be a kind of change of current cooler control method of embodiment of the present invention PLC control in wind turbine operate show
It is intended to；
Fig. 6 is that wind turbine operates again during a kind of PLC of change of current cooler control method of embodiment of the present invention is controlled
One width schematic diagram.
Embodiment
Embodiments of the present invention are described below in detail, the example of embodiment is shown in the drawings, wherein identical or class
As label represent same or similar element from beginning to end or there is same or like element.Below with reference to attached
The embodiment of figure description is exemplary, and can only be used to explain embodiments of the present invention, and it is not intended that to the present invention
Embodiment limitation.
What one-tower double-circuit DC transmission system referred to be exactly twice DC line wiring on the same tower, change of current valve group built with location it is straight
Flow power transmission engineering；Have the characteristics that many different from conventional single time DC engineering：Both ends current conversion station two returns direct current with location construction, nothing
Work(compensation coordinates the unified configuration of control by twice direct currents, stand in change of current valve group be adjacently positioned, twice direct current leads share one and connect
Earth polar, and twice DC power transmission line wiring on the same tower etc..
Separated under decoupled mode there may be receiving end and sending end individually with string with main grid structure, system will automatically exit from
The functions such as damping control, more direct current coordinated control functions, subsynchronous oscillation damping.
Under both the above situation, have larger fluctuation to direct current station power use system, once DC DC station electro-mechanical wave compared with
Big or loss, will cause the PLC logical programs by direct current control to turn cold there are larger unstability so as to influence the change of current
But the control of device.
Patent of the present invention is mainly improved and innovated on original a whole set of logical program, for original change of current
Deficiency in cooler control logic carries out regrouping PLC logical programs.
A kind of referring to Fig. 1, change of current cooler control method of embodiment of the present invention.In this embodiment, with
Exemplified by one-tower double-circuit DC transmission system is as the execution object of step, hereinafter referred transmission system.
In the change of current cooler control method, change of current cooler is applied in one-tower double-circuit DC transmission system, together
Tower double back DC transmission system includes PLC control modules, i.e., the PLC logical programs of direct current control are realized by the module, when
So, transmission system also includes other modules, and details are not described herein.The change of current cooler control method comprises the following steps：
Step 1, judge that the change of current becomes default fault condition whether occur.Operation personnel can pass through the prison to transmission system
Control, obtains the working status that the change of current becomes.When the change of current becomes the default fault condition of appearance, 2 are entered step.
Step 2, if the determination result is YES, then the control command for representing excision cooler is sent to cooler.When transmission of electricity is
System judges that the change of current becomes the default fault condition of appearance, then is by sending form to cooler, control command of control command
Represent excision cooler control command, it is ensured that trouble point will not rapid dispersion to elsewhere.
Step 3, whether detection cooler receives the control command of excision cooler.Transmission system further determines that cooling
Whether device receives the control command of excision cooler, that is, determines whether the control command of excision cooler, subsequently into
Step 4.
Step 4, if cooler receives the control command of excision cooler, differential solution is triggered according to first scheduled time
Lock button.The operation personnel of transmission system can preset a time, such as 150ms is going out as first scheduled time
After now cutting off the control command of cooler, transmission system can realize that involution is poor by the triggering 150ms of differential unblock button
Signal is moved, the program in PLC control modules can enter ready state at this time.It is specific as shown in Figure 2.
Step 5, differential unblock button is triggered according to second scheduled time, cooler is controlled on the spot by PLC control modules
Automatic start.The operation personnel of transmission system can reset a time in advance, such as 5s is pressed as second scheduled time
Live in differential unblock button 5s, the function of automatic start on the spot is realized by PLC control modules control cooler.It is specific such as Fig. 3 and
Shown in Fig. 4.
It is used for Novel DC with all reading according to the copy for the conventional used PLC program of direct current power transmission engineering in the prior art
In transmission system, this will cause the change of current to become cooling performance cannot meet the requirements to a certain extent.The solution of the present invention passes through
Judge that the change of current becomes default fault condition whether occur, then realize different control logics, cut off after specially breaking down
Cooler controls, and then realizes involution differential wave by differential unlock, enters the control program in PLC control modules and prepares
State finally realizes the result of automatic start cooler.
Wherein, in certain embodiments, default fault condition breaks down including inverter inside, i.e., transmission system connects
Receive and represent that the change of current becomes internal the first instruction broken down.
Wherein, in certain embodiments, default fault condition includes relay protection switch drive experiments, i.e. transmission system
Receive the second instruction for representing relay protection switch drive experiments.
Wherein, in certain embodiments, default fault condition includes change of current transformer differential protection misoperation, i.e. transmission system
Receive the 3rd instruction for representing change of current transformer differential protection misoperation.
Embodiment 2：
In the logical program of the PLC control modules of transmission system, whole group cooler is stopped transport during failure in order to prevent, is cancelled
Traditional working group, spare group, the setting of the function such as assisted group, by the way of four groups of coolers start at the same time, ran
Cheng Zhong, simply wind turbine rotational frequency is in different size, and so dependence mutual between difference wind turbines will become less, be conducive to cold
But the stability of device, but the requirement higher to PLC logical programs.On the basis of embodiment 1, the change of current proposed by the present invention turns cold
But device control method, except the step 1 comprising embodiment 1 to step 5, change of current cooler control method is further comprising the steps of：
Whether the temperature contact for judging to detect is below default level-one temperature contact；
If the temperature detected, below default level-one temperature contact, control cooler makes wind turbine with first frequency
Speed is run.
The temperature of detection includes oil surface temperature or winding temperature.Operation personnel can pre-set level-one in transmission system
Temperature contact and wind turbine rotational frequency are 10%, can be the level-one temperature that oil surface temperature corresponds to an oil surface temperature specifically
Contact is spent, winding temperature corresponds to the level-one temperature contact of winding temperature.
, can be by detecting pasta when four groups of coolers start at the same time by taking transmission system includes four groups of coolers as an example
Temperature or winding temperature, and then the temperature contact that detects is judged whether below default level-one temperature contact, if detecting
Temperature below default level-one temperature contact, then control cooler wind turbine is run with 10% speed of minimum speed.
It is specific as shown in Figure 5.
It is preferred that on the basis of embodiment 2, change of current cooler control method is further comprising the steps of：
Whether the temperature for judging to detect reaches default two level temperature contact；
If the temperature detected reaches default two level temperature contact, control cooler makes wind turbine with the speed of second frequency
Degree operation；
Wherein, level-one temperature contact is less than two level temperature contact.
The temperature of detection includes oil surface temperature or winding temperature.Operation personnel can pre-set two level in transmission system
Temperature contact and wind turbine rotational frequency are 20%, can be the two level temperature that oil surface temperature corresponds to an oil surface temperature specifically
Contact is spent, winding temperature corresponds to the two level temperature contact of winding temperature.For example, when oil surface temperature is higher than 45 DEG C or winding temperature is high
In 60 DEG C, then cooler is controlled wind turbine is run with the speed of 20% frequency.
It is preferred that control cooler makes wind turbine with further comprising the steps of after the speed operation of second frequency：
Acquisition and the electric current of more current valve side and the electric current of net side, it is the first side to determine the big side of electric current；
Control cooler makes wind turbine be run according to first side Real-time frequency conversion.
For example, when oil surface temperature is higher than 45 DEG C or winding temperature is higher than 60 DEG C, then control cooler makes wind turbine with 20%
The speed operation of frequency, rear fan run according to larger load Real-time frequency conversion in transmission system valve side or net side, judge a certain
Can then be compared when whether side is larger load using electric current.It is specific as shown in Figure 5.
It is preferred that transmission system can continue to detect corresponding temperature, the change of current cooler control method further include with
Lower step：
Whether the temperature for judging to detect reaches default three-level temperature contact；
If the temperature detected reaches default three-level temperature contact, control cooler makes wind turbine with the speed of the 3rd frequency
Degree operation；
Wherein, two level temperature contact is less than three-level temperature contact.
The temperature of detection includes oil surface temperature or winding temperature.Operation personnel can pre-set two level in transmission system
Temperature contact and wind turbine rotational frequency are 40%, can be the three-level temperature that oil surface temperature corresponds to an oil surface temperature specifically
Contact is spent, winding temperature corresponds to the three-level temperature contact of winding temperature.For example, when oil surface temperature is higher than 60 DEG C or winding temperature is high
In 70 DEG C, then cooler is controlled wind turbine is run with the speed of 40% frequency.
It is preferred that control cooler makes wind turbine with further comprising the steps of after the speed operation of second frequency：
Acquisition and the electric current of more current valve side and the electric current of net side, it is the second side to determine the big side of electric current；
Control cooler makes wind turbine be run according to second side Real-time frequency conversion.
For example, when oil surface temperature is higher than 60 DEG C or winding temperature is higher than 70 DEG C, then control cooler makes wind turbine with 40%
The speed operation of frequency, rear fan run according to larger load Real-time frequency conversion in transmission system valve side or net side, judge a certain
Can then be compared when whether side is larger load using electric current.It is specific as shown in Figure 6.
Wherein, which is applicable to the normal operation mode of one-tower double-circuit DC transmission system
Or islet operation pattern.
In the description of embodiments of the present invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length
Degree ", " width ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ",
The orientation or position relationship of the instruction such as " outer ", " clockwise ", " counterclockwise " are based on orientation shown in the drawings or position relationship, only
It is to be described for the ease of description embodiments of the present invention with simplified, rather than indicates or imply that the device of meaning or element are necessary
With specific orientation, with specific azimuth configuration and operation, therefore it is not intended that limitation to embodiments of the present invention.
In addition, term " first ", " second " are only used for description purpose, and it is not intended that instruction or hint relative importance or implicit
Indicate the quantity of indicated technical characteristic.Thus, " first " is defined, the feature of " second " can be expressed or impliedly wrap
Include one or more feature.In the description of embodiments of the present invention, " multiple " are meant that two or two
More than, unless otherwise specifically defined.
, it is necessary to illustrate in the description of embodiments of the present invention, unless otherwise clearly defined and limited, term
" installation ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or one
Connect body；Can mechanically connect or be electrically connected or can mutually communicate；It can be directly connected, can also lead to
Cross intermediary to be indirectly connected, can be the interaction relationship of connection inside two elements or two elements.For ability
For the those of ordinary skill in domain, it can understand that above-mentioned term in embodiments of the present invention specific contains as the case may be
Justice.
In embodiments of the present invention, unless otherwise clearly defined and limited, fisrt feature second feature it
" on " or it " under " can directly be contacted including the first and second features, it is not directly to connect that can also include the first and second features
Touch but pass through the other characterisation contact between them.Moreover, fisrt feature second feature " on ", " top " and " on
Face " includes fisrt feature directly over second feature and oblique upper, or to be merely representative of fisrt feature level height special higher than second
Sign.Fisrt feature second feature " under ", " lower section " and " below " include fisrt feature immediately below second feature and obliquely downward
Side, or be merely representative of fisrt feature level height and be less than second feature.
Following disclosure provides many different embodiments or example is used for realizing embodiments of the present invention not
Same structure.In order to simplify the disclosure of embodiments of the present invention, hereinafter the component and setting of specific examples are described.When
So, they are merely examples, and is not intended to limit the present invention.In addition, embodiments of the present invention can be in different examples
Repeat reference numerals and/or reference letter in son, this repetition are for purposes of simplicity and clarity, itself not indicate to be begged for
By the relation between various embodiments and/or setting.In addition, the various specific techniques that embodiments of the present invention provide
With the example of material, but application and/or other materials those of ordinary skill in the art may realize that other techniques makes
With.
In the description of this specification, reference term " embodiment ", " some embodiments ", " schematically implementation
The description of mode ", " example ", " specific example " or " some examples " etc. means the tool with reference to the embodiment or example description
Body characteristics, structure, material or feature are contained at least one embodiment or example of the present invention.In the present specification,
Schematic expression of the above terms is not necessarily referring to identical embodiment or example.Moreover, the specific features of description, knot
Structure, material or feature can combine in an appropriate manner in any one or more embodiments or example.
Any process or method described otherwise above description in flow chart or herein is construed as, and represents to include
Module, fragment or the portion of the code of the executable instruction of one or more the step of being used for realization specific logical function or process
Point, and the scope of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discuss suitable
Sequence, including according to involved function by it is basic at the same time in the way of or in the opposite order, carry out perform function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
Expression or logic and/or step described otherwise above herein in flow charts, for example, being considered use
In the order list for the executable instruction for realizing logic function, may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system including the system of processing module or other can be from instruction
The system of execution system, device or equipment instruction fetch and execute instruction) use, or combine these instruction execution systems, device or
Equipment and use.For the purpose of this specification, " computer-readable medium " can be it is any can include, store, communicating, propagating or
Transmission program uses for instruction execution system, device or equipment or with reference to these instruction execution systems, device or equipment
Device.The more specifically example (non-exhaustive list) of computer-readable medium includes following：With one or more wiring
Electrical connection section (electronic device), portable computer diskette box (magnetic device), random access memory (RAM), read-only storage
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, computer-readable medium can even is that the paper that can print described program on it or other are suitable
Medium, because can be for example by carrying out optical scanner to paper or other media, then into edlin, interpretation or if necessary with it
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each several part of embodiments of the present invention can be with hardware, software, firmware or combinations thereof come real
It is existing.In the above-described embodiment, multiple steps or method can use storage in memory and by suitable instruction execution system
The software or firmware of execution is realized.If for example, being realized with hardware, with another embodiment, ability can be used
Any one of following technology known to domain or their combination are realized：With for realizing logic function to data-signal
The discrete logic of logic gates, has the application-specific integrated circuit of suitable combinational logic gate circuit, programmable gate array
(PGA), field programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that to realize all or part of step that above-described embodiment method carries
Suddenly it is that relevant hardware can be instructed to complete by program, the program can be stored in a kind of computer-readable storage medium
In matter, the program upon execution, including one or a combination set of the step of embodiment of the method.
In addition, each functional unit in various embodiments of the present invention can be integrated in a processing module, also may be used
To be that unit is individually physically present, can also two or more units be integrated in a module.It is above-mentioned integrated
Module can both be realized in the form of hardware, can also be realized in the form of software function module.The integrated module
If realized in the form of software function module and as independent production marketing or in use, a calculating can also be stored in
In machine read/write memory medium.
Storage medium mentioned above can be read-only storage, disk or CD etc..
Although the embodiment of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (10)
1. a kind of change of current cooler control method, it is characterised in that the change of current cooler is applied in common-tower double-return direct current
In transmission system, the one-tower double-circuit DC transmission system includes PLC control modules, the new change of current cooler control method
Comprise the following steps：
Judge that the change of current becomes default fault condition whether occur；
If the determination result is YES, then the control command for representing excision cooler is sent to cooler；
Whether detection cooler receives the control command of excision cooler；
If cooler receives the control command of excision cooler, differential unblock button is triggered according to first scheduled time；
Differential unblock button is triggered according to second scheduled time, cooler automatic start on the spot is controlled by PLC control modules.
2. change of current cooler control method as claimed in claim 1, it is characterised in that the default fault condition includes
Receive and represent that the change of current becomes internal the first instruction broken down.
3. change of current cooler control method as claimed in claim 1, it is characterised in that the default fault condition includes
Receive the second instruction for representing relay protection switch drive experiments.
4. change of current cooler control method as claimed in claim 1, it is characterised in that the default fault condition includes
Receive the 3rd instruction for representing change of current transformer differential protection misoperation.
5. the change of current cooler control method as described in any one in Claims 1-4, it is characterised in that described new
Change of current cooler control method is further comprising the steps of：
Whether the temperature contact for judging to detect is below default level-one temperature contact；
If the temperature detected, below default level-one temperature contact, control cooler makes wind turbine with the speed of first frequency
Operation.
6. change of current cooler control method as claimed in claim 5, it is characterised in that the new change of current cooler control
Method processed is further comprising the steps of：
Whether the temperature for judging to detect reaches default two level temperature contact；
If the temperature detected reaches default two level temperature contact, control cooler makes wind turbine be transported with the speed of second frequency
OK；
Wherein, level-one temperature contact is less than two level temperature contact.
7. change of current cooler control method as claimed in claim 6, it is characterised in that it is described control cooler make wind turbine with
It is further comprising the steps of after the speed operation of second frequency：
Acquisition and the electric current of more current valve side and the electric current of net side, it is the first side to determine the big side of electric current；
Control cooler makes wind turbine be run according to first side Real-time frequency conversion.
8. change of current cooler control method as claimed in claims 6 or 7, it is characterised in that the new change of current becomes cooling
Device control method is further comprising the steps of：
Whether the temperature for judging to detect reaches default three-level temperature contact；
If the temperature detected reaches default three-level temperature contact, control cooler makes wind turbine be transported with the speed of the 3rd frequency
OK；
Wherein, two level temperature contact is less than three-level temperature contact.
9. change of current cooler control method as claimed in claim 8, it is characterised in that it is described control cooler make wind turbine with
It is further comprising the steps of after the speed operation of second frequency：
Acquisition and the electric current of more current valve side and the electric current of net side, it is the second side to determine the big side of electric current；
Control cooler makes wind turbine be run according to second side Real-time frequency conversion.
10. change of current cooler control method as claimed in claim 9, it is characterised in that the new change of current cooler control
Method processed is applicable to the normal operation mode or islet operation pattern of one-tower double-circuit DC transmission system.
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| CN201610963202.5A CN106545513B (en) | 2016-11-04 | 2016-11-04 | A kind of change of current cooler control method |
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| CN201610963202.5A CN106545513B (en) | 2016-11-04 | 2016-11-04 | A kind of change of current cooler control method |
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| CN110957109A (en) * | 2019-11-25 | 2020-04-03 | 国网四川省电力公司广安供电公司 | Oil-immersed self-cooling transformer cooling system |
| CN117177546A (en) * | 2023-11-02 | 2023-12-05 | 海门市飞鹭制冷设备有限公司 | Intelligent control system of cooling fan |
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| JPS5748209A (en) * | 1980-09-05 | 1982-03-19 | Hitachi Ltd | Control method for operation of transformer |
| JP4438533B2 (en) * | 2004-06-30 | 2010-03-24 | 株式会社ダイヘン | Fan control method for cooling device for indoor installation transformer |
| KR20130049026A (en) * | 2011-11-03 | 2013-05-13 | 주식회사 포스코 | Apparatus for controling linkage of transformer load and method thereof |
| CN103324130B (en) * | 2012-04-26 | 2016-01-20 | 山东电力集团公司青岛供电公司 | A kind of transformer intelligent air-cooling energy-saving and frequency-variable method |
| CN205122373U (en) * | 2015-09-17 | 2016-03-30 | 国网山东烟台市牟平区供电公司 | Power transformer |
| CN205644199U (en) * | 2015-11-25 | 2016-10-12 | 中国南方电网有限责任公司超高压输电公司曲靖局 | Distributing type frequency conversion fan intelligent monitoring system |
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2016
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