CN103534893B - Electric equipment and operation method thereof - Google Patents
Electric equipment and operation method thereof Download PDFInfo
- Publication number
- CN103534893B CN103534893B CN201280023174.9A CN201280023174A CN103534893B CN 103534893 B CN103534893 B CN 103534893B CN 201280023174 A CN201280023174 A CN 201280023174A CN 103534893 B CN103534893 B CN 103534893B
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- transformer
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- measurement value
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H6/00—Emergency protective circuit arrangements responsive to undesired changes from normal non-electric working conditions using simulators of the apparatus being protected, e.g. using thermal images
- H02H6/005—Emergency protective circuit arrangements responsive to undesired changes from normal non-electric working conditions using simulators of the apparatus being protected, e.g. using thermal images using digital thermal images
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
Abstract
The present invention relates generally to a kind of method for controlling to have the electric equipment (90) of at least one transformer (92), especially for control energy distribution equipment.Arranged according to the present invention, carry out the inner temperature of measuring transformer (92) by forming inner measured temperature (Ti); Measure current measurement value (I), which show transformer (92) primary side or primary side flow through transformer (92) electric current or with this current in proportion; When over-current state, utilize inner measured temperature (Ti) and current measurement value (I) to determine, before the temperature of inside transformer meets or exceeds predetermined maximum temperature, over-current state can last long; And under the condition considering the determined time interval (tmax), carry out the further control to electric equipment (90).
Description
Technical field
The present invention relates to a kind of method of electric equipment, especially energy distribution equipment for controlling to have at least one transformer.
Background technology
This method such as can be used to the power distribution station (Ortsnetzstation) of secondary power distribution rank.The power distribution station of secondary power distribution rank forms primarily of medium voltage switchgear equipment, transformer and low-voltage distribution equipment.In secondary power distribution net, usually in open loop, run power distribution station.Hereinafter term " middle pressure " is interpreted as the voltage between 1kV to 50kV in scope, and term " low pressure " is interpreted as the voltage between 200V to 1kV in scope.
In power distribution station, main (the such as oil is filled) transformer of liquid filling that uses is as distribution transformer, very responsive for thermal overload reaction in its technical conditions.Trickle overload can serious curtailment transformer life, or the transformer involved by even causing damaging.In order to avoid these, when the electric current flowing through transformer exceedes predetermined threshold value, usually turn off transformer by suitable proterctive equipment.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of for controlling electric equipment, especially for the method controlling energy distribution equipment, the method more effectively can run electric equipment than existing method.
This technical problem is solved by having according to the method for the feature of claim 1 according to the present invention.Give the optimal technical scheme according to method of the present invention in the dependent claims.
According to invention has been following design: the temperature coming measuring transformer inside by forming inner measured temperature; Measure current measurement value, which show transformer primary or primary side flow through transformer electric current or with this current in proportion; When over-current state, utilize inner measured temperature and current measurement value to determine, before the temperature of inside transformer meets or exceeds predetermined maximum temperature, over-current state can last long; And under the condition considering the determined time interval, carry out the further control to electric equipment.
Major advantage according to method of the present invention is, when over-current state appears in involved transformer, need not be turned off immediately, although but can there is over-current state and continue to run.This is by being really achieved surely the time interval according to the present invention's design, and this time interval gives, and before the temperature of inside transformer is dangerous for this transformer, over-current state can last long.Achieve generally the more effective control of electric equipment according to process of the present invention because such as suitable remedial measure can be taked within " extra " time interval so that avoid to transformer infringement or damage transformer overheated.Such as can within the determined time interval, the load reducing this transformer in circuit to other section of other transformer or energy distribution equipment is changed by a part for the electric current by flowing through transformer.
According to the particularly preferred technical scheme of this method, the temperature of measuring transformer outside is carried out by forming outside measured temperature, and utilize inner measured temperature, outside measured temperature and current measurement value to determine when over-current state, before the temperature of inside transformer meets or exceeds predetermined maximum temperature, over-current state can last long.This technical scheme in a particularly advantageous manner, not only considers the temperature of inside transformer, also considers the temperature of transformer outside.This very accurately can calculate hot-fluid from inside transformer to outside, that depend primarily on external temperature completely, and therefore, it is possible to very accurately determine, before the temperature of inside transformer reaches its dangerous values, the over-current state of transformer can last long.
Preferably under the condition of thermodynamical model proposing transformer computing time interval, this time interval gives over-current state and can last long.Preferably use calculation element for this reason, under the condition considering thermodynamical model, this calculation element is programmed.The thermodynamical model of transformer preferably considers the thermal capacitance of transformer and the thermal conductance from inside transformer to outside of transformer.
Preferably, when current measurement value (which show the electric current that transformer primary or primary side flow through transformer, or with this current in proportion) exceedes predetermined threshold value, then over-current state is inferred.Preferably, when meeting or exceeding this threshold value, producing alarm signal, which identify the beginning of over-current state.
When there is over-current state, within the determined time interval, preferably reduce the electric current flowing through transformer, to prevent from meeting or exceeding the maximum temperature predetermined to transformer.Be provided with according to the particularly preferred technical scheme of this method, by a part for the electric current flowing through transformer is guided in other section of electric equipment, particularly be directed to flow past other transformer of electric equipment, thus reduced the electric current flowing through this transformer.
The invention still further relates to a kind of electric equipment, particularly energy distribution equipment, it has at least one transformer and the device for controlling this electric equipment.According to the present invention, devise: in transformer, arrange measuring transducer about such electric equipment, this measuring transducer by forming inner measured temperature, can carry out the temperature of measuring transformer inside; Have current measuring device, it can form current measurement value, this current measurement value give the primary side of transformer or primary side flow through transformer electric current or with this current in proportion; Measuring transducer and current measuring device are connected to evaluation module, when there is over-current state in it, at least utilize inner measured temperature and current measurement value to determine, before the temperature of inside transformer meets or exceeds predetermined maximum temperature, over-current state can last long; And be configured to the device controlling electric equipment like this, make it after there is over-current state, under the condition considering the time interval determined by evaluation module, implement the further control to electric equipment.
About the advantage of electric equipment according to the present invention, see the above-mentioned enforcement combined according to method of the present invention, because substantially meet the advantage according to method of the present invention according to the advantage of electric equipment of the present invention.
Electric equipment is preferably medium voltage switchgear equipment, such as, for power distribution station.
Such as be configured for by the control device of power distribution station and the control centre of higher level the device controlling electric equipment.
The invention still further relates to a kind of evaluation module for electric equipment, it is above-described the same.According to the present invention, the feature of such evaluation module is: for the interface be connected with the measuring transducer being arranged in inside transformer, and this measuring transducer can carry out the temperature of measuring transformer inside by forming inner measured temperature; For the interface be connected with current measuring device, this current measuring device can measure current measurement value, this current measurement value give transformer primary or primary side flow through transformer electric current or with this current in proportion; And calculation element, it, under the condition of thermodynamical model considering transformer, can calculate the time interval, can continue over-current state within this time interval.
The advantage according to electric equipment of the present invention is met according to the advantage of evaluation module of the present invention.
The invention still further relates to a kind of electrical energy distribution network node for electrical energy distribution network.According to the present invention, this electrical energy distribution network node has transformer and evaluation module, and it is above-described the same.
Electrical energy distribution network node preferably has the power distribution station of medium voltage switchgear equipment, and it is applicable to being connected with the loop cable of medium voltage network.
Accompanying drawing explanation
The present invention is explained further below by embodiment, wherein:
Fig. 1 illustrates the embodiment of the layout with a large amount of power distribution station, and it is interconnected by loop cable, runs in open loop, and wherein at least one power distribution station is constructed according to the invention; With
Fig. 2 to Fig. 5 shows the embodiment according to medium voltage switchgear equipment of the present invention in detail, and it such as may be used for according to power distribution station of the present invention.
For clarity, in the accompanying drawings identical Reference numeral is used all the time for identical or close parts.
Embodiment
Visible high-voltage fence 10 in FIG, it is connected with medium voltage network 30 by power transformer 20.Loop cable 40 is connected to medium voltage network 30, and power distribution station 50 to 58, under the condition forming open loop 45, is interconnected by it.Shown in Fig. 1, constituted the burble point T of open loop 45 by power distribution station 54.
For the layout according to Fig. 1, by transformer 60, wind power installation 70 is connected to the wiring 52a of the low-pressure side of power distribution station 52, this wind power installation comprises three windmills 71,72 and 73 in the example shown.Wind power installation 70 produces electric energy, and described electric energy is input in loop cable 40 by the low compression bonded line 52a of power distribution station 52 and is also therefore input in medium voltage network 30.
In FIG, the representative as other power distribution station also describes power distribution station 50 and 51 in detail in detail.Can find out, these two power distribution stations 50 and 51 have the medium voltage switchgear equipment 90 for being connected with the loop cable 40 of medium voltage network 30 respectively.By switch 91, transformer 92 is connected to medium voltage switchgear equipment 90 place, pressure in the medium voltage network 30 in scope between 1kV and 50kV converts to for terminal client or the suitable low pressure of terminal electrical appliance by described transformer, such as every phase 220V.
At transformer 92, place is connected to low-voltage distribution equipment 93, and it has a large amount of wiring, for the low pressure of output transformer 92.
Figure 2 illustrates the embodiment of the medium voltage switchgear equipment 90 of power distribution station.Can find out, medium voltage switchgear equipment 90 is equipped with three distribution panelboards, namely for connecting the first loop cable distribution panelboard 90a(of loop cable 40 of medium voltage network 30 see Fig. 1 at input side), for connecting the second loop cable distribution panelboard 90b of loop cable 40 at outlet side and being thus connected the matched transformer electroplax 90c of transformer 92 for connecting valve 91.
In addition can find out, medium voltage switchgear equipment 90 is equipped with two switch drivers 200 and 201, and it acts on switch 90d and 90e of medium voltage switchgear equipment 90.Switch driver 200 and 201 can turn on and off switch 90d or 90e corresponding respectively.Switch driver 202 turns on and off switch 91.
Can also see the electrical control gear 300 with remote units form in fig. 2, it comprises control module 310 and evaluation module 320.
The task of control module 310 is, control switch driver 200,201 and 202, so that console switch 90d, 90e and 91 arrive the desired position of the switch respectively.
Evaluation module 320 has interface, and this evaluation module utilizes this interface to be connected with the sensor for measuring temperature 330 of the inside being arranged in transformer 92 inside.The temperature of inner sensor for measuring temperature 330 measuring transformer 92 inside, and form inner measured temperature Ti, it is transferred to evaluation module 320.
Evaluation module 320 also has other interface, and it is for being connected with current measuring device 340.Current measuring device 340 measures the electric current flowing through transformer in the primary side of transformer 92, and produces corresponding current measurement value I, and it is transferred to evaluation module 320.
According in the embodiment of Fig. 2, measure the electric current in transformer 92 primary side; Additionally or alternatively, the electric current in primary side can also be measured, to determine the current loading of transformer 92 quantitatively.
Evaluation module 320 is equipped with calculation element 321, stored therein the thermodynamical model of transformer 92.Thermodynamical model such as can consider the thermal capacitance of transformer 92 and the thermal conductance from inside transformer to outside of transformer.
Like this calculation element 321 is programmed, it is monitored current measurement value I about exceeding predetermined threshold.If determine over-current state, then calculation element 321 consider the thermodynamical model of transformer 92, current current measurement value I and inside measured temperature Ti condition under computing time interval tmax, this time interval refers to: in the temperature arrival of inside transformer or before exceeding predetermined maximum temperature, or before transformer 92 suffers damage due to over-current state, the time that over-current state can continue.
Evaluation module 320 is by the time interval tmax that determined by calculation element 321 and the alarm signal W common transport control centre 400 to higher level.As long as current current measurement value I meets or exceeds predetermined threshold value, then produce alarm signal W.
Therefore control centre 400 learns, at medium voltage switchgear equipment 90, place exists overload conditions, must be terminated in the time interval tmax calculated by calculation element 321.Control centre 400 correspondingly attempts making medium voltage switchgear equipment 90 reduce load, and guides electric current by other switchgear of electrical energy distributing equipment.If can realize such changing its course, then evaluation module 320 will, according to current measurement value I, be determined can terminate over-current state in calculated time interval tmax, and the control centre 400 of superior sends and removes alarm signal accordingly.
Infeasible and the lasting over-current state if electric current changes its course, then the control centre 400 of higher level orders ST to the control module 310 transmission shutoff of control device 300, thus makes control module 310 can turn off transformer 92.For this reason, control module 310 such as can trigger switch drivers 202 also cut-off switch 91.
Generally speaking, when over-current state, control device 300 can make transformer 92 first (more precisely for calculated maximum time interval tmax) continuation operation, makes the control centre 400 of higher level can impel the load reducing this transformer 92 on the other hand thus before must turning off transformer.By the time interval tmax sending alarm signal W and calculate, significantly improve the flexibility that control centre 400 can run energy distribution equipment, because also purposively can also monitor that ground continues to run the equipment of temporary overload.
According in the embodiment of Fig. 2, control centre 400 and control device 300 together constitute for controlling medium voltage switchgear equipment 90, for controlling affiliated power distribution station and the device for controlling the medium voltage network 30 according to Fig. 1.
Fig. 3 shows another embodiment of the medium voltage switchgear equipment 90 according to the power distribution station of Fig. 1.
According in the embodiment of Fig. 3, evaluation module 320 has additional interface, utilizes it to make evaluation module 320 and therefore makes calculation element 321 be connected with the sensor for measuring temperature 350 of outside.Outside sensor for measuring temperature 350 is disposed in the outside of transformer 92, and therefore measures outside measured temperature Ta, and described measured temperature gives the ambient temperature of transformer 92.Outside sensor for measuring temperature 350 such as can be assemblied in the outside of transformer 92.
Be with the difference of the embodiment according to Fig. 2, if should give in computing time in this time interval of interval tmax(after there is over-current state, before the temperature of inside transformer arrives or exceedes predetermined maximum temperature, how long transformer 92 can also run under overload), so according to the calculation element 321 of Fig. 3 therefore, it is possible to except considering inner measured temperature Ti, also consider outside measured temperature Ta.The temperature of extra consideration outside makes calculation element 321 can calculate or simulate hot-fluid from inside transformer to outside more accurately, because the temperature difference of the hot-fluid from inside to outside at least almost and between external temperature Ta and internal temperature Ti is proportional.
As long as the current measurement value I according to current measuring device 340 recognizes over-current state, then calculation element 321 determines time interval tmax under the condition of measured temperature Ta considering current measurement value I, inner measured temperature Ti and outside, this time interval refers to, before transformer 92 suffers damage, the time that over-current state can continue.Determined time interval tmax and alarm signal W is transferred to the control centre 400 of higher level jointly, and its trial impels medium-voltage equipment 90 to reduce load, as described in composition graphs 2.In addition, corresponding with the embodiment according to Fig. 2 according to the embodiment of Fig. 3.
Fig. 4 shows another embodiment of the medium voltage switchgear equipment 90 according to the power distribution station of Fig. 1.According in the embodiment of Fig. 4, evaluation module 320 is additionally connected with control module 310, and when can not terminate over-current state in calculated time interval tmax, automatically produces and turn off order ST.Therefore, if after transferring alarm signal W and the time interval tmax that calculates, do not obtain from the control centre 400 of higher level and corresponding turn off order ST and over-current state is also continuing, so, control centre 400 ground that control device 300 can not rely on higher level causes the shutoff of transformer 92.By automatically turning off transformer 92 by control device 300, reaching higher security of operation, because both shutoff can be triggered by the control centre 400 of higher level, also automatically can trigger shutoff by control device 300.
Fig. 5 shows another embodiment of the medium voltage switchgear equipment 90 according to the power distribution station shown in Fig. 1.Corresponding with the embodiment according to Fig. 4 to a great extent according to the embodiment of Fig. 5, because according in the embodiment of Fig. 5, when can't terminate determined over-current state in calculated time interval tmax, to be transmitted to control module 310 by evaluation module 320 and corresponding turn off order ST, control device 300 also can the shutoff of automatically Trigger transformers 92.In order to determine time interval tamx, the calculation element 321 of evaluation module 320 is except considering that the current measurement value I of current measuring device 340 is with except the measured temperature Ti of the inside of inner sensor for measuring temperature 330, also considers the measured temperature Ta of the outside of the sensor for measuring temperature 350 of the outside of installing in the outside of transformer 92.Therefore, the working method of calculation element 321 and evaluation module 320 corresponds to calculation element 321 according to the embodiment of Fig. 3 about the working method of interval tmax computing time, thus refers to the related content of enforcement above.
List of reference signs
10 high-voltage fences
20 power transformers
30 medium voltage networks
40 loop cables
45 open loops
50-58 power distribution station
The low compression bonded line of 52a
60 transformers
70 wind power installations
71 windmills
72 windmills
73 windmills
90 medium voltage switchgear equipments
90a loop cable distribution panelboard
90b loop cable distribution panelboard
90c matched transformer electroplax
90d switch
90e switch
91 switches
92 transformers
93 voltage power distribution equipments
200 switch drivers
201 switch drivers
202 switch drivers
300 control device
310 control modules
320 evaluation modules
321 calculation elements
The sensor for measuring temperature of 330 inside
340 current measuring devices
The sensor for measuring temperature of 350 outsides
400 control centres
E removes alarm signal
I current measurement value
ST turns off order
Ta measured temperature
Ti measured temperature
The tmax time interval
W alarm signal
Claims (11)
1., for controlling a method with the electric equipment (90) of at least one transformer (92), it is characterized in that,
-by forming inner measured temperature (Ti), measure the temperature that described transformer (92) is inner;
-measure current measurement value (I), this current measurement value give described transformer (92) primary side or primary side flow through this transformer (92) electric current or with this current in proportion;
-when over-current state, utilize the measured temperature of described inside (Ti) and described current measurement value (I) to determine, before the temperature of described inside transformer meets or exceeds predetermined maximum temperature, over-current state can last long; And
-under the condition considering the determined time interval (tmax), carry out the further control to described electric equipment (90).
2. in accordance with the method for claim 1, it is characterized in that,
-by forming outside measured temperature (Ta), the temperature of measuring transformer outside; And
-when over-current state, utilize the measured temperature of described inside (Ti), the measured temperature (Ta) of described outside and described current measurement value (I) to determine, before the temperature of described inside transformer meets or exceeds predetermined maximum temperature, over-current state can last long.
3. according to the method described in the claims 1, it is characterized in that, under the condition of the thermodynamical model calculated by calculation element (321) considering described transformer (92), calculate the described time interval (tmax), can over-current state be continued within this time interval.
4. according to the method described in the claims 2, it is characterized in that, under the condition of the thermodynamical model calculated by calculation element (321) considering described transformer (92), calculate the described time interval (tmax), can over-current state be continued within this time interval.
5. according to the method according to any one of the claims 1-4, it is characterized in that, if described current measurement value (I) exceedes predetermined threshold value, then infer over-current state.
6. according to the method according to any one of the claims 1-4, it is characterized in that, when over-current state, within the determined time interval (tmax), reduce the electric current flowing through described transformer (92).
7. in accordance with the method for claim 6, it is characterized in that, reduce by other section of a part for electric current being directed to described electric equipment the electric current flowing through described transformer.
8. an electric equipment (10,91), having at least one transformer (92) and the device for controlling described electric equipment, it is characterized in that,
-in described transformer (92), arranging measuring transducer (330), this measuring transducer by forming inner measured temperature (Ti), can measure the temperature that this transformer (92) is inner;
-there is current measuring device (340), it can form current measurement value (I), this current measurement value give the primary side of described transformer (92) or primary side flow through this transformer (92) electric current or with this current in proportion;
-be connected on evaluation module (320) on described measuring transducer (330) and described current measuring device (340), described evaluation module utilizes the measured temperature of described inside (Ti) and described current measurement value (I) to determine when over-current state, before the temperature that described transformer (92) is inner meets or exceeds predetermined maximum temperature, over-current state can last long; And
-be configured to the device controlling described electric equipment like this, make it after there is over-current state, under the condition considering the time interval (tmax) determined by described evaluation module (320), implement the further control to this electric equipment.
9. one kind for the evaluation module (320) according to electric equipment according to claim 8 (10,91), it is characterized in that,
-interface for being connected with the measuring transducer (330) being arranged in inside transformer, this measuring transducer by forming inner measured temperature (Ti), can measure the temperature of described inside transformer;
-interface for being connected with current measuring device (340), this current measuring device can measure current measurement value (I), this current measurement value give described transformer (92) primary side or primary side flow through this transformer (92) electric current or with this current in proportion; And
-calculation element (321), it, under the condition of thermodynamical model considering described transformer (92), can calculate the time interval (tmax), can continue over-current state within this time interval.
10. for an electrical energy distribution network node for electrical energy distribution network (10), wherein, described electrical energy distribution network node has transformer (92) and according to evaluation module according to claim 8 (320).
11. according to electrical energy distribution network node according to claim 10, it is characterized in that, described electrical energy distribution network node is the power distribution station (50-58) with medium voltage switchgear equipment (90), and it is applicable to being connected with the loop cable (40) of medium voltage network (30).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011005837.0 | 2011-03-21 | ||
| DE201110005837 DE102011005837A1 (en) | 2011-03-21 | 2011-03-21 | Electrical system and method of operation |
| PCT/EP2012/054438 WO2012126781A1 (en) | 2011-03-21 | 2012-03-14 | Electrical system and method for the operation thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103534893A CN103534893A (en) | 2014-01-22 |
| CN103534893B true CN103534893B (en) | 2016-04-06 |
Family
ID=45929502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280023174.9A Active CN103534893B (en) | 2011-03-21 | 2012-03-14 | Electric equipment and operation method thereof |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2689508A1 (en) |
| CN (1) | CN103534893B (en) |
| DE (1) | DE102011005837A1 (en) |
| WO (1) | WO2012126781A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014060014A1 (en) * | 2012-10-15 | 2014-04-24 | Siemens Aktiengesellschaft | Method for operating a power transformer |
| DE102014102373B3 (en) | 2014-02-24 | 2015-01-22 | Maschinenfabrik Reinhausen Gmbh | Network node for a power grid, regulating transformer for a network node and method for operating a network node |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6424266B1 (en) * | 2000-07-17 | 2002-07-23 | Nxtphase Technology Srl | Apparatus for preventing thermal damage to an electrical power transformer |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6714022B2 (en) * | 2001-02-20 | 2004-03-30 | Gary Hoffman | Apparatus and method for cooling power transformers |
| US6906630B2 (en) * | 2001-02-28 | 2005-06-14 | General Electric Company | Transformer management system and method |
| JP2005302794A (en) * | 2004-04-07 | 2005-10-27 | Hitachi Industrial Equipment Systems Co Ltd | Transformer monitoring system |
| US7377689B2 (en) * | 2005-05-06 | 2008-05-27 | Qualitrol Corporation | Transformer temperature monitoring and control |
-
2011
- 2011-03-21 DE DE201110005837 patent/DE102011005837A1/en not_active Withdrawn
-
2012
- 2012-03-14 WO PCT/EP2012/054438 patent/WO2012126781A1/en active Application Filing
- 2012-03-14 CN CN201280023174.9A patent/CN103534893B/en active Active
- 2012-03-14 EP EP12712083.0A patent/EP2689508A1/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6424266B1 (en) * | 2000-07-17 | 2002-07-23 | Nxtphase Technology Srl | Apparatus for preventing thermal damage to an electrical power transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103534893A (en) | 2014-01-22 |
| DE102011005837A1 (en) | 2012-09-27 |
| WO2012126781A1 (en) | 2012-09-27 |
| EP2689508A1 (en) | 2014-01-29 |
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