CN103534893A - Electrical system and method for the operation thereof - Google Patents
Electrical system and method for the operation thereof Download PDFInfo
- Publication number
- CN103534893A CN103534893A CN201280023174.9A CN201280023174A CN103534893A CN 103534893 A CN103534893 A CN 103534893A CN 201280023174 A CN201280023174 A CN 201280023174A CN 103534893 A CN103534893 A CN 103534893A
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- transformer
- current
- temperature
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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 invention relates, among other things, to a method for controlling an electrical system (90), in particular an energy distribution system, comprising at least one transformer (92). According to the invention, the temperature in the interior of the transformer (92) is measured so as to form a inner temperature reading (Ti), a current reading (I) is measured, which indicates the current flowing through the transformer (92) on the primary side or the secondary side of the transformer (92) or is proportional to said current, in the case of an overload current situation the inner temperature reading (Ti) and the current reading (I) are used to determine how long the overload current situation can last before the temperature in the interior of the transformer has reached or exceeds a predetermined maximum temperature, and the further control of the electrical system (90); takes place in consideration of the determined time period (tmax).
Description
Technical field
The present invention relates to a kind of for controlling, the have electric equipment of at least one transformer, the method for special energy distribution equipment.
Background technology
This method for example can be used to secondary other power distribution station of distribution level (Ortsnetzstation).Secondary other power distribution station of distribution level is mainly comprised of medium voltage switchgear equipment, transformer and low-voltage distribution equipment.In secondary power distribution network, conventionally in open loop, move power distribution station.Hereinafter term " middle pressure " is interpreted as the voltage in scope between 1kV to 50kV, and term " low pressure " is interpreted as the voltage in scope between 200V to 1kV.
In power distribution station, mainly use (for example oil is filled) transformer of liquid filling as distribution transformer, very responsive for thermal overload reaction in its technical conditions.Trickle overload can seriously shorten transformer life, or even causes damaging related transformer.For fear of these, when flowing through the electric current of transformer and surpass predetermined threshold value, conventionally by suitable protection equipment, turn-off transformer.
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 for controlling energy distribution equipment, and the method can more effectively be moved electric equipment than existing method.
According to the present invention, by having according to the method for the feature of claim 1, solve this technical problem.Provided in the dependent claims the optimal technical scheme of the method according to this invention.
According to the present invention, carried out following design: the temperature of coming measuring transformer inside by forming inner measured temperature; Measure current measurement value, it has provided in transformer primary or primary side and has flow through the electric current of transformer or proportional with this electric current; The in the situation that of over-current state, utilize inner measured temperature and current measurement value to determine, before the temperature of transformer inside meets or exceeds predetermined maximum temperature, over-current state can last long; And considering, under the condition in the determined time interval, to carry out the further control to electric equipment.
The major advantage of the method according to this invention is, in the situation that over-current state appears in related transformer, needn't be turn-offed immediately, although but can there is over-current state and continue operation.This is achieved the time interval really surely by the design according to the present invention, and this time interval has provided, and before the temperature of transformer inside is dangerous for this transformer, over-current state can last long.According to process of the present invention, realized generally the more effective control of electric equipment, because for example can take suitable remedial measure within " extra " time interval, to avoid overheated to the transformer of transformer infringement or damage.For example can be within the determined time interval, by a part that flows through the electric current of transformer being changed to circuit to the load that reduces this transformer in other section of other transformer or energy distribution equipment.
According to the particularly preferred technical scheme of this method, by forming outside measured temperature, carry out the temperature of measuring transformer outside, and the in the situation that of over-current state, utilize inner measured temperature, outside measured temperature and current measurement value to determine, before the temperature of transformer inside meets or exceeds predetermined maximum temperature, over-current state can last long.This technical scheme, in particularly advantageous mode, is not only considered the temperature of transformer inside, also considers the temperature of transformer outside.This can very accurately calculate hot-fluid from transformer inside to outside, that depend primarily on external temperature completely, and therefore can very accurately determine, before the temperature of transformer inside reaches its dangerous values, the over-current state of transformer can last long.
Preferably under the condition of thermodynamical model that has proposed transformer computing time interval, this time interval has provided over-current state and can last long.Preferably use calculation element for this reason, under the condition of considering thermodynamical model, this calculation element is programmed.The thermodynamical model of transformer preferably consider the thermal capacitance of transformer and transformer from transformer inside to outside thermal conductance.
Preferably, when current measurement value (it has provided the electric current that transformer primary or primary side flow through transformer, or proportional with this electric current) surpasses predetermined threshold value, infer over-current state.Preferably, when meeting or exceeding this threshold value, produce alarm signal, it has identified the beginning of over-current state.
In the situation that there is over-current state, preferably within the determined time interval, reduce and flow through the electric current of transformer, to prevent from meeting or exceeding the maximum temperature predetermined to transformer.Particularly preferred technical scheme according to this method is provided with, by a part that flows through the electric current of transformer being guided in other section of electric equipment, particularly its guiding is flow through to other transformer of electric equipment, thereby reduced the electric current that flows through this transformer.
The invention still further relates to a kind of electric equipment, energy distribution equipment particularly, it has at least one transformer and for controlling the device of this electric equipment.According to the present invention, about such electric equipment, designed: in transformer, arrange measuring transducer, this measuring transducer can, by forming inner measured temperature, carry out the temperature of measuring transformer inside; Have current measuring device, it can form current measurement value, and this current measurement value has provided in the primary side of transformer or primary side and flow through the electric current of transformer or proportional with this electric current; At measuring transducer, be connected evaluation module with on current measuring device, in it in the situation that there is over-current state, at least utilize inner measured temperature and current measurement value to determine, before the temperature of transformer inside meets or exceeds predetermined maximum temperature, over-current state can last long; And be configured to like this control the device of electric equipment, make it after there is over-current state, under the condition in the time interval of considering to be determined by evaluation module, implement the further control to electric equipment.
About according to the advantage of electric equipment of the present invention, referring to the above-mentioned enforcement that combines the method according to this invention, because substantially meet the advantage of the method according to this invention according to the advantage of electric equipment of the present invention.
Electric equipment is medium voltage switchgear equipment preferably, for example, for power distribution station.
For example by the control device of power distribution station and higher level's control centre, be configured for controlling the device of 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, such evaluation module is characterised in that: the interface being connected for the measuring transducer with being arranged in transformer inside, and this measuring transducer can carry out by forming inner measured temperature the temperature of measuring transformer inside; For the interface that is connected with current measuring device, this current measuring device can be measured current measurement value, and this current measurement value has provided in transformer primary or primary side and flow through the electric current of transformer or proportional with this electric current; And calculation element, it,, under the condition of thermodynamical model of considering transformer, can calculate the time interval, within this time interval, can continue over-current state.
According to the advantage of evaluation module of the present invention, meet the advantage according to electric equipment 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 select is the power distribution station with medium voltage switchgear equipment, and it is applicable to being connected with the loop cable of medium voltage network.
Accompanying drawing explanation
By embodiment, further explain the present invention below, wherein:
Fig. 1 illustrates the embodiment of the layout with a large amount of power distribution stations, and it interconnects by loop cable, move, and wherein at least one power distribution station is constructed according to the invention in open loop; With
Fig. 2 to Fig. 5 shows the embodiment according to medium voltage switchgear equipment of the present invention in detail, and it for example can be for power distribution station according to the present invention.
For clarity, for identical or close parts, use all the time in the accompanying drawings identical Reference numeral.
Embodiment
Visible high-voltage fence 10 in Fig. 1, it is connected with medium voltage network 30 by power transformer 20.Loop cable 40 is connected to medium voltage network 30, and it,, forming under the condition of open loop 45, interconnects power distribution station 50 to 58.Shown in Fig. 1, by power distribution station 54, formed the burble point T of open loop 45.
For according to the layout of 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 at example.Wind power installation 70 produces electric energy, and described electric energy is input in loop cable 40 and so is input in medium voltage network 30 by the low compression bonded line 52a of power distribution station 52.
In Fig. 1, as the representative of other power distribution station, power distribution station 50 and 51 have also been described in detail in detail.Can find out, these two power distribution stations 50 and 51 have respectively the medium voltage switchgear equipment 90 being connected for the loop cable 40 with medium voltage network 30.By switch 91, transformer 92 is connected to medium voltage switchgear equipment 90 places, described transformer converts the middle pressure of the medium voltage network in scope between 1kV and 50kV 30 for example, for terminal client or the suitable low pressure of terminal electrical appliance, every phase 220V to.
At transformer, 92 places have connected 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, for the first loop cable distribution panelboard 90a(of loop cable 40 of connecting medium voltage network 30 at input side referring to Fig. 1), for connecting the second loop cable distribution panelboard 90b of loop cable 40 at outlet side and for connecting valve 91 and be thus connected the matched transformer electroplax 90c of transformer 92.
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 the 90e of medium voltage switchgear equipment 90. Switch driver 200 and 201 can turn on and off corresponding respectively switch 90d or 90e.Switch driver 202 turns on and off switch 91.
In Fig. 2, can also see the electrical control gear 300 with remote units form, it comprises control module 310 and evaluation module 320.
The task of control module 310 is that control switch driver 200,201 and 202, so that console switch 90d, 90e and 91 arrive respectively the desirable position of the switch.
According to the embodiment of Fig. 2, measure the electric current in transformer 92 primary sides; Additionally or alternatively, also can measure the electric current in primary side, to determine quantitatively the current loading of transformer 92.
Like this calculation element 321 is programmed, it is monitored current measurement value I about surpassing predetermined threshold.If determined over-current state, calculation element 321 under the condition of considering the thermodynamical model of transformer 92, current current measurement value I and inner measured temperature Ti computing time interval tmax, this time interval refers to: the temperature in transformer inside arrives or surpasses before predetermined maximum temperature, or before transformer 92 suffers damage due to over-current state, the time that over-current state can be lasting.
Therefore control centre 400 learns, at medium voltage switchgear equipment, 90 places exist overload condition, must in the time interval tmax being calculated by calculation element 321, be finished.Control centre 400 correspondingly attempts making medium voltage switchgear equipment 90 to reduce load, and carrys out guide current by other switchgear of electrical energy distributing equipment.If can realize such changing its course, evaluation module 320 will be determined in calculated time interval tmax and can finish over-current state according to current measurement value I, and the control centre 400 of superior sends the corresponding alarm signal of removing.
Infeasible and the lasting over-current state if electric current changes its course, higher level's control centre 400 sends shutoff order ST to the control module 310 of control device 300, thereby makes control module 310 can turn-off transformer 92.For this reason, control module 310 for example can trigger switch driver 202 cut-off switch 91.
Generally speaking, the in the situation that of over-current state, control device 300 can make first (more precisely for calculated maximum time interval tmax) continuation operation of transformer 92, makes thus on the other hand higher level's control centre 400 can before must turn-offing transformer, impel the load that reduces this transformer 92.By the time interval tmax that sends alarm signal W and calculate, obviously improved control centre 400 and can move the flexibility of energy distribution equipment, because also can purposively and monitor that ground continues the equipment of the temporary transient overload of operation.
At the embodiment Zhong， control centre 400 according to Fig. 2 and control device 300, jointly formed for controlling medium voltage switchgear equipment 90, for the power distribution station under controlling with for controlling according to the device of the medium voltage network of Fig. 1 30.
Fig. 3 shows another embodiment according to the medium voltage switchgear equipment of the power distribution station of Fig. 1 90.
According to the embodiment of Fig. 3, evaluation module 320 has additional interface, utilizes it make evaluation module 320 and therefore calculation element 321 be connected with outside sensor for measuring temperature 350.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 has provided the ambient temperature of transformer 92.Outside sensor for measuring temperature 350 for example can be assemblied in the outside of transformer 92.
With according to the difference of the embodiment of Fig. 2, be, if should provide in computing time in this time interval of interval tmax(after there is over-current state, in the temperature arrival of transformer inside or over before predetermined maximum temperature, how long transformer 92 can also move under overload), according to the calculation element of Fig. 3 321, therefore can, except considering inner measured temperature Ti, also consider outside measured temperature Ta so.The outside temperature of extra consideration makes calculation element 321 calculate more accurately or to simulate from transformer inside to outside hot-fluid, because the temperature difference at least almost and external temperature Ta and internal temperature Ti is proportional from inside to outside hot-fluid.
As long as recognize over-current state according to the current measurement value I of current measuring device 340, calculation element 321 is determined time interval tmax under the condition of considering the measured temperature Ti of current measurement value I, inside and the measured temperature Ta of outside, this time interval refers to, before transformer 92 suffers damage, the time that over-current state can be lasting.Determined time interval tmax and alarm signal W are transferred to higher level's control centre 400 jointly, and its trial impels medium-voltage equipment 90 to reduce load, as described in conjunction with Fig. 2.In addition, corresponding with the embodiment according to Fig. 2 according to the embodiment of Fig. 3.
Fig. 4 shows another embodiment according to the medium voltage switchgear equipment of the power distribution station of Fig. 1 90.According to the embodiment of Fig. 4, evaluation module 320 is additionally connected with control module 310, and in the situation that in calculated time interval tmax, can not finish over-current state, automatically generation shutoff order ST.Therefore, if after the time interval tmax that has transmitted alarm signal W and calculated, from higher level's control centre 400, do not obtain and turn-off order ST and over-current state is also continuing accordingly, so, control centre 400 ground that control device 300 can not rely on higher level cause the shutoff of transformer 92.By automatically turn-offing transformer 92 by control device 300, reached higher security of operation, because both can trigger and turn-off by higher level's control centre 400, also can automatically trigger shutoff by control device 300.
Fig. 5 shows another embodiment according to the medium voltage switchgear equipment of the power distribution station shown in Fig. 1 90.Corresponding with the embodiment according to Fig. 4 to a great extent according to the embodiment of Fig. 5, because according to the embodiment of Fig. 5, in the situation that can't finish determined over-current state in calculated time interval tmax, by evaluation module 320, to control module 310, transmit the corresponding order ST that turn-offs, control device 300 also can automatically trigger the shutoff of transformer 92.In order to determine time interval tamx, the calculation element 321 of evaluation module 320 is except considering the measured temperature Ti of the current measurement value I of current measuring device 340 and the inside of inner sensor for measuring temperature 330, also considers the outside measured temperature Ta of the outside sensor for measuring temperature 350 installed in the outside of transformer 92.Therefore, the working method of calculation element 321 and evaluation module 320 is corresponding to the working method about interval tmax computing time according to the calculation element of the embodiment of Fig. 3 321, thereby 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 turn-offs order
Ta measured temperature
Ti measured temperature
The tmax time interval
W alarm signal
Claims (10)
1. for controlling electric equipment (90), particularly a method for energy distribution equipment with at least one transformer (92), it is characterized in that,
-by forming inner measured temperature (Ti), measure the inner temperature of described transformer (92);
-measure current measurement value (I), this current measurement value has provided in described transformer (92) primary side or primary side and has flow through the electric current of this transformer (92) or proportional with this electric current;
-in the situation that of over-current state, utilize the measured temperature (Ti) of described inside and described current measurement value (I) to determine, before the temperature of described transformer inside meets or exceeds predetermined maximum temperature, over-current state can last long; And
-considering, under the condition in the determined time interval (tmax), to 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
-in the situation that of over-current state, utilize measured temperature (Ta) and the described current measurement value (I) of the measured temperature (Ti) of described inside, described outside to determine, before the temperature of described transformer inside meets or exceeds predetermined maximum temperature, over-current state can last long.
3. according to the method described in any one in the claims, it is characterized in that, under the condition of the thermodynamical model calculating by calculation element (321) of considering described transformer (92), calculate the described time interval (tmax), within this time interval, can continue over-current state.
4. according to the method described in any one in the claims, it is characterized in that, if described current measurement value (I) surpasses predetermined threshold value, infer over-current state.
5. according to the method described in any one in the claims, it is characterized in that, the in the situation that of over-current state, within the determined time interval (tmax), reduce the electric current that flows through described transformer (92).
6. in accordance with the method for claim 5, it is characterized in that, by a part for electric current being directed in other section of described electric equipment, particularly other transformer of this electric equipment is flow through in guiding, reduces the electric current that flows through described transformer.
7. an electric equipment (10,91), particularly energy distribution equipment, have at least one transformer (92) and for controlling the device of described electric equipment, it is characterized in that,
-in described transformer (92), arranged measuring transducer (330), this measuring transducer can, by forming inner measured temperature (Ti), be measured the inner temperature of this transformer (92);
-thering is current measuring device (340), it can form current measurement value (I), and this current measurement value has provided in the primary side of described transformer (92) or primary side and has flow through the electric current of this transformer (92) or proportional with this electric current;
-described measuring transducer (330) with on described current measuring device (340), be connected on evaluation module (320), described evaluation module utilizes the measured temperature (Ti) of described inside and described current measurement value (I) to determine the in the situation that of over-current state, and before the inner temperature of described transformer (92) meets or exceeds predetermined maximum temperature, over-current state can last long; And
-be configured to like this control the device of described electric equipment, make it after there is over-current state, considering, under the condition in definite time interval (tmax) by described evaluation module (320), to implement the further control to this electric equipment.
8. one kind for according to the evaluation module of electric equipment claimed in claim 7 (10,91) (320), it is characterized in that,
-the interface that is connected for the measuring transducer (330) with being arranged in transformer inside, this measuring transducer can, by forming inner measured temperature (Ti), be measured the temperature of described transformer inside;
-interface for being connected with current measuring device (340), this current measuring device can be measured current measurement value (I), and this current measurement value has provided in described transformer (92) primary side or primary side and flow through the electric current of this transformer (92) or proportional with this electric current; And
-calculation element (321), it,, under the condition of thermodynamical model of considering described transformer (92), can calculate the time interval (tmax), within this time interval, can continue over-current state.
9. for the electrical energy distribution network node of electrical energy distribution network (10), wherein, described electrical energy distribution network node has transformer (92) and according to evaluation module claimed in claim 8 (320).
10. according to electrical energy distribution network node claimed in claim 9, 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 true CN103534893A (en) | 2014-01-22 |
| CN103534893B 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 (5)
| 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 |
| US20020113599A1 (en) * | 2001-02-20 | 2002-08-22 | Gary Hoffman | Apparatus and method for cooling power transformers |
| US20020161558A1 (en) * | 2001-02-28 | 2002-10-31 | Bruno Georges | Transformer management system and method |
| US20050223782A1 (en) * | 2004-04-07 | 2005-10-13 | Hitachi Industrial Equipment Systems Co., Ltd. | Transformer monitoring system |
| US20060250683A1 (en) * | 2005-05-06 | 2006-11-09 | 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 (5)
| 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 |
| US20020113599A1 (en) * | 2001-02-20 | 2002-08-22 | Gary Hoffman | Apparatus and method for cooling power transformers |
| US20020161558A1 (en) * | 2001-02-28 | 2002-10-31 | Bruno Georges | Transformer management system and method |
| US20050223782A1 (en) * | 2004-04-07 | 2005-10-13 | Hitachi Industrial Equipment Systems Co., Ltd. | Transformer monitoring system |
| US20060250683A1 (en) * | 2005-05-06 | 2006-11-09 | Qualitrol Corporation | Transformer temperature monitoring and control |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102011005837A1 (en) | 2012-09-27 |
| CN103534893B (en) | 2016-04-06 |
| EP2689508A1 (en) | 2014-01-29 |
| WO2012126781A1 (en) | 2012-09-27 |
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