CN104316134B - Oil-immersed and high-voltage Oil-filled Electrical Equipments position monitoring method - Google Patents
Oil-immersed and high-voltage Oil-filled Electrical Equipments position monitoring method Download PDFInfo
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- CN104316134B CN104316134B CN201410618580.0A CN201410618580A CN104316134B CN 104316134 B CN104316134 B CN 104316134B CN 201410618580 A CN201410618580 A CN 201410618580A CN 104316134 B CN104316134 B CN 104316134B
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Abstract
Oil-immersed and high-voltage Oil-filled Electrical Equipments position monitoring method, belongs to the Study On Intelligent Monitoring Techniques field of power system and its relevant device.Comprise the following steps：Step a, system starts；Step b, System self-test；Whether step c, System self-test is normal；Step d, exports fault-signal；Step e, gathers static pressure signal；Step f, input PLC calculates current oil level；Step g, calculates the current oil temperature under the oil levelt；Step h, current oil temperaturetWhether the safe oil temperature upper limit is higher than；Step i, oil level is too high；Step j, current oil temperaturetWhether safe oil temperature lower limit is less than；Step k, oil level is too low；Step l, PLC judge whether reset.Lower tank bottoms are provided with fuel level sensor, fuel level sensor wiring is connected from after terminal box extraction with the input port of controller.The present invention is capable of the accurate oil condition of real-time watch device insulating oil, and oil level is converted into electric quantity information and uploaded, and realizes the on-line monitoring of oiling electrical equipment oil level, improves the intelligent level of equipment.
Description
Technical field
Oil-immersed and high-voltage Oil-filled Electrical Equipments position monitoring method, belongs to the Study On Intelligent Monitoring Techniques of power system and its relevant device
Field.
Background technology
Insulating oil in oil-immersed and high-voltage electrical equipment plays insulation, radiating or arc extinguishing, the too high and too low all generals of oil level
Influence its safe operation.Too high oil level is probably that environment temperature is high, machine utilization is big, oil conservater Capacity design is unreasonable, inside
There are the factors such as heating accident to cause, can increase device interior pressure, easily cause device damage, trigger power outage；Oil
Potential drop is low, it may be possible to operating ambient temperature is too low, oil conservater Capacity design is unreasonable, equipment poor sealing cause leakage of oil etc. because
Element causes, and will also jeopardize apparatus insulated, triggers equipment breakdown.Oil-immersed and high-voltage electrical equipment needs periodically or monitored in real time oil level
Situation of change, prevent from triggering apparatus insulated accident because oil starvation causes humidified insulation or dielectric strength to reduce, be also prevented from equipment
Portion's oil level is high, pressure causes greatly equipment oil spout or occurs explosion accident.
In the prior art, it is necessary to install tubular type or pointer-type oil on the oil conservater at the top of oil-immersed and high-voltage electrical equipment
Position meter, the oil level for supervision equipment built-in electrical insulation oil.The program is due to being in high potential at the top of high voltage electric equipment, even if peace
Fill sensor, signal power source also is difficult to solve because of Insulation Problems, without any electric signal output, it is necessary to by artificial periodical inspection come
Obtain oil level information.There is many drawbacks in the program, one be due to current equipment periodical inspection cycle it is long, it is impossible to monitor on-line
The oil level information of insulating oil, influences the collection of state quantity of the equipment information.After two are the long-term charging operation of equipment, oil level indicating device
Because of aging or dirty, cause ground tour personnel to keep powered safe distance because needing, and can not correctly recognize insulating oil oil level,
Also have and limited by installation site, it is powered to make an inspection tour extremely inconvenient, leave hidden danger to equipment safety operation.Three be the oil of the solution
Level display apparatus is in high potential, once situations such as there is leakage of oil, misregister, influence equipment operation, it is necessary to right immediately
Equipment, which is implemented to have a power failure, could eliminate defect.Four be that the oil level information of current oil-immersed and high-voltage electrical equipment is the qualitative of non-electric quantity
Information is, it is necessary to be manually entered, it is impossible to automatic to upload and intellectual analysis, has a strong impact on power electrical equipment and transformer station's overall intelligence
The raising of level.
The content of the invention
The technical problem to be solved in the present invention is：Overcome the deficiencies in the prior art being capable of real time on-line monitoring there is provided one kind
Apparatus insulated oily oil condition, and oil level is converted into electric quantity information and uploaded, real-time collecting oil-immersed and high-voltage is electrically set
The oil-immersed and high-voltage electrical equipment oil level monitoring system of standby oil condition amount, and improve the intelligence of oil-immersed and high-voltage electrical equipment
The oil-immersed and high-voltage Oil-filled Electrical Equipments position monitoring method of level can be changed.
The technical solution adopted for the present invention to solve the technical problems is：The oil-immersed and high-voltage electrical equipment oil level monitoring side
Method, it is characterised in that：Comprise the following steps：
Step a, system starts；
After upper electricity, system normally starts；
Step b, System self-test；
System carries out self-inspection after starting；
Whether step c, System self-test is normal；
PLC judges whether System self-test is normal, if normally, performing step 1005, if self-inspection is abnormal, performs step
1004；
Step d, exports fault-signal；
PLC is exported fault-signal, and failure logging is uploaded into host computer stored；
Step e, gathers static pressure signal；
The static pressure signal of fuel level sensor collection fuel tank interior insulation oil；
Step f, injection PLC calculates current oil level；
The static pressure collected is delivered to PLC by fuel level sensor, and PLC calculates the level height in fuel tank；
Step g, calculates the current oil temperature under the oil levelt；
PLC calculates current oil temperature corresponding under current oil levelt；
Step h, current oil temperaturetWhether the safe oil temperature upper limit is higher than；
PLC judges current oil temperaturetWhether the safe oil temperature upper limit is higher than, if current oil temperaturetHigher than the safe oil temperature upper limit, hold
Row step i, otherwise performs step j；
Step i, oil level is too high；
PLC judges that current oil level is too high in fuel tank, and is alarmed；
Step j, current oil temperaturetWhether safe oil temperature lower limit is less than；
PLC judges current oil temperaturetWhether safe oil temperature lower limit is less than, if current oil temperaturetLess than safe oil temperature lower limit, hold
Row step k, otherwise return to step e；
Step k, oil level is too low；
PLC judges that current oil level is too low in fuel tank, and is alarmed；
Step l, PLC judge whether reset；
PLC judges whether to receive the reset signal of reset switch, if reset switch sends reset signal, PLC controls
Warning device is stopped；If reset switch does not send reset signal, warning device works on, to the abnormality of oil level
Warned, stored while warning message is uploaded into host computer.
It is preferred that, in step f, described PLC calculates the level height in fuel tank according to static pressure-oil level curve.
It is preferred that, in step g, described PLC calculates current oil temperature according to oil level-oil temperature curvet。
It is preferred that, in step h, the described safe oil temperature upper limit is standard oil temperaturet 0 With temperature margin∆tSum.
It is preferred that, in step h, described safe oil temperature lower limit is standard oil temperaturet 0 With temperature margin∆tDifference.
A kind of oil-immersed and high-voltage electrical equipment oil level monitoring system, including fuel reserve tank, the insulator set gradually from top to bottom
And lower fuel tank, fuel reserve tank and lower fuel tank are provided with terminal box by insulator UNICOM in the side of lower fuel tank, it is characterised in that：
Bottom in described lower fuel tank is provided with fuel level sensor, and the power supply of fuel level sensor and signal wire pass through described wiring
Box is connected after drawing with the input port of controller.
It is preferred that, be provided with and be connected to the reset key that the controller input/output port is connected, controller it is defeated
Exit port connects warning device, display screen and host computer simultaneously.
It is preferred that, described fuel level sensor is realized using pressure sensor.
It is preferred that, described controller is PLC.
Compared with prior art, the present invention is had an advantageous effect in that：
1st, by the oil-immersed and high-voltage electrical equipment oil level monitoring system of the present invention, by setting oil level to sense in fuel tank
Device, without tubular type or pointer type fuel level indicator is being installed at the top of equipment again, equipment self seal performance is improved, reduced
The apparatus insulated probability made moist.
2nd, it is capable of the oil condition of real-time watch device insulating oil, and oil level is converted into electric quantity information and uploaded, it is real
Show the real-time collecting of oil-immersed and high-voltage electrical equipment oil level quantity of state, improve the intelligent water of oil-immersed and high-voltage electrical equipment
It is flat.
3rd, fuel level sensor is arranged on the bottom of lower fuel tank, therefore away from electrification in high voltage position, particularly descends in fuel tank
Winding and the electromagnetic component such as iron core, so avoiding electromagnetic interference when carrying out data transmission, signal transmission is more stablized,
Solve simultaneously in the prior art due to Insulation Problems, the sensor signal power supply in high potential is insurmountable always to ask
Topic, makes it possible electric signal output.
4th, oil level information realizes automatic data collection and transmission, without again by manually periodically obtaining oil level to on-the-spot make an inspection tour
Information, realizes quantitative detection and display, improves validity and the degree of accuracy of oil condition information, alleviates work burden,
Improve operating efficiency.
5th, oil level display device is in ground potential, and electrical equipment top of oil-tank need not install oil level display device, it is to avoid
Equipment must be implemented immediately to have a power failure once abnormal, defect could be eliminated, equipment operational reliability is improved.
Brief description of the drawings
Fig. 1 is oil-immersed and high-voltage electrical equipment oil level monitoring system structural representation.
Fig. 2 is oil-immersed and high-voltage electrical equipment oil level monitoring system hardware connection figure.
Fig. 3 is oil-immersed and high-voltage Oil-filled Electrical Equipments position monitoring method flow chart.
Wherein：1st, oil level form 2, fuel reserve tank 3, binding post 4, insulator 5, terminal box 6, connecting line 7, lower fuel tank
8th, fuel level sensor.
Embodiment
Fig. 1 ~ 3 are highly preferred embodiment of the present invention, and 1 ~ 3 the present invention will be further described below in conjunction with the accompanying drawings：
In the oil-immersed and high-voltage electrical equipment of prior art, two fuel tanks up and down interconnected are generally provided with, oil
Insulating oil in case plays insulation, radiating or arc extinguishing effect.Typically installed at the top fuel tank of oil-immersed and high-voltage electrical equipment
Tubular type or pointer type fuel level indicator, the oil level for supervision equipment built-in electrical insulation oil.The fixed peace in top fuel tank or bottom sump
The electromagnetic components such as winding and iron core equipped with oil-immersed and high-voltage electrical equipment.
In the prior art, according to certain structure and the oil immersed type electrical equipment feature of height, because its top fuel tank is big
Small is heat condition, operating ambient temperature, the quantity for being filled with insulating oil, the density of insulating oil and the expansion system run by equipment
Number, electrical equipment integrally allow to bear the decision of the factors such as pressure, once the classification of oil immersed type electrical equipment, structure snd size are true
Fixed, the oil level under normal temperature is exactly a level altitude, and level height determines the pressure in electrical equipment oil tank bottom portion.Simultaneously
After specification, size when oil immersed type electrical equipment are determined, there can be a determination between fuel tank interior insulation oil static pressure and oil level
Static pressure-oil level curve, i.e., according to the proportionate relationship of insulating oil static pressure and oil level, by measuring the exhausted of electrical equipment oil tank bottom portion
Edge oil static pressure change, the oil condition information of consersion unit.
Meanwhile, in the prior art, the oil level information of oil-immersed and high-voltage electrical equipment be by its running environment temperature or
Curve corresponding to the temperature of insulating oil shows, the oil level display under different temperatures is different, oil level with insulation oil temperature rise into
Proportional relation changes.Therefore, after specification, size when oil immersed type electrical equipment is determined, while the oil of a determination can be formed
Position-temperature curve.
As shown in figure 1, by taking oil-immersed current transformer as an example, including fuel reserve tank 2, the insulator 4 set gradually from top to bottom
And lower fuel tank 7, fuel reserve tank 2 and lower fuel tank 7 pass through the UNICOM of insulator 4.It is provided with the side of fuel reserve tank 2 for observing fuel reserve tank
The oil level form 1 of oil level in 2, is provided with binding post 3 same as the prior art between fuel reserve tank 2 and insulator 4.In insulator
The side of the lower fuel tank 7 of 4 lower sections is provided with terminal box 5, in the prior art, one or more ends can be drawn by terminal box 5
Son.Bottom in lower fuel tank 7 is provided with the fuel level sensor 8 for detecting oil level in fuel tank, and lower fuel tank 7 is transported in electrical equipment
Operation is grounded during row, in ground potential, fuel level sensor 8 and lower fuel tank 7 are fixed together the ground potential that exists together, fuel level sensor 8
Signal and its required power supply are drawn from terminal box 5 simultaneously by connecting line 6.
Fuel level sensor 8 is arranged on the bottom of lower fuel tank 7, therefore away from electrification in high voltage position, particularly descends in fuel tank 7
Winding and the electromagnetic component such as iron core, so avoiding electromagnetic interference when carrying out data transmission, signal transmission is more stablized,
Solve simultaneously in the prior art due to Insulation Problems, the sensor signal power supply in high potential is insurmountable always to ask
Topic, makes it possible electric signal output.In this oil-immersed and high-voltage electrical equipment oil level monitoring system, fuel level sensor 8 can be adopted
Realized with pressure sensor.
As shown in Fig. 2 oil-immersed and high-voltage electrical equipment oil level monitoring system, including：As the PLC of control core, with PLC
The connected fuel level sensor 8 of any input port, reset key, the warning indicator lamp of PLC output ports connection, buzzing
Device, display screen and host computer.
Fuel level sensor 8 collects the static pressure signal of oil level, and oil level information is sent by connecting line 6 as electronic signals
Analyzed to PLC, PLC judges the current oil level status information in fuel tank according to the known static pressure-oil level curve determined, and
Oil level information can be transmitted to display screen and is shown or be uploaded to host computer or transformer station's synthesis by existing communications protocol
Automated system carries out the storage of data.It is achieved thereby that the teletransmission of oil level information and automatic analysis and judgment in fuel tank.At PLC pairs
After oil level information is judged, the temperature in current fuel tank is judged by static pressure-oil level curve and oil level-temperature curve
Degree, according to the function and structure feature of prior art oil immersed type electrical equipment, oil level information is shown with temperature pattern, is oil level shape
State information analysis, judgement provide foundation.PLC is calculated after the running temperature and oil level information obtained in fuel tank, when in fuel tank
When oil level is too high and too low, PLC can be alarmed by warning indicator lamp and buzzer, to show operating oil immersion
Formula high voltage electric equipment is in abnormality, after alarm, can realize warning message by the reset key being connected with PLC
Reset.The temperature of fuel tank running environment can sets itself as needed, be typically set between -45 DEG C ~ 80 DEG C.
By setting fuel level sensor in fuel tank, without again in the installation tubular type at the top of equipment or pointer oil level
Meter, equipment self seal performance is improved, and reduces the apparatus insulated probability that makes moist.Simultaneously being capable of real-time watch device insulating oil
Oil condition, and oil level is converted into electric quantity information and uploaded, realize oil-immersed and high-voltage electrical equipment oil level quantity of state
Real-time collecting, improve the intelligent level of oil-immersed and high-voltage electrical equipment, it is to avoid pair must be set immediately once abnormal
It is standby to implement to have a power failure, defect could be eliminated, equipment operational reliability is improved.
In this oil-immersed and high-voltage electrical equipment oil level monitoring system, PLC can use the disposable type of commercially available any producer
PLC realize that such as siemens PLC, S7-300, PLC can also be realized by the controllers of other forms simultaneously, such as monolithic
Machine or computer.Fuel level sensor can be realized using the pressure sensor of commercially available disposable type.
As shown in figure 3, oil-immersed and high-voltage Oil-filled Electrical Equipments position monitoring method, comprises the following steps：
Step 1001, system starts；
After upper electricity, system normally starts；
Step 1002, System self-test；
System carries out self-inspection after starting；
Step 1003, whether System self-test is normal；
PLC judges whether System self-test is normal, if normally, performing step 1005, if self-inspection is abnormal, performs step
1004；
Step 1004, fault-signal is exported；
PLC is exported fault-signal, and failure logging is uploaded into host computer stored；
Step 1005, static pressure signal is gathered；
The static pressure signal of the collection fuel tank interior insulation oil of fuel level sensor 8；
Step 1006, injection PLC calculates current oil level；
The static pressure collected is delivered to PLC by fuel level sensor 8, and PLC is calculated in fuel tank according to static pressure-oil level curve
Level height；
Step 1007, the current oil temperature under the oil level is calculatedt；
PLC calculates current oil temperature corresponding under current oil level according to oil level-temperature curvet；
Step 1008, output display；
PLC is shown temperature information by the display screen being attached thereto on a display screen, and temperature information is uploaded
Stored in host computer；
Step 1009, current oil temperaturetWhether standard oil temperature is more thant 0 With temperature margin∆tSum；
PLC judges the current oil temperature obtained according to oil level-oil temperature curvetWhether standard oil temperature is more thant 0 With temperature margin∆ tSum；If current oil temperaturetMore than standard oil temperaturet 0 With temperature margin∆tSum, performs step 1010, otherwise performs step
1011；
Step 1010, oil level is too high；
PLC judges that current oil level is too high in fuel tank, is alarmed by warning indicator lamp and buzzer；
Step 1011, current oil temperaturetWhether standard oil temperature is less thant 0 With temperature margin∆tDifference；
PLC judges the current oil temperature obtained according to oil level-oil temperature curvetWhether standard oil temperature is less thant 0 With temperature margin∆ tDifference；If current oil temperaturetLess than standard oil temperaturet 0 With temperature margin∆tDifference, perform step 1012, otherwise return to step
1005；
In the prior art, oil level information is embodied often through oil temperature.As described above, oil immersed type electrical equipment
After classification, structure snd size are determined, static pressure-oil level curve and oil level-oil temperature curve can be determined simultaneously, while can determine whether this
The Safe Levels and oil level surplus of oil immersed type electrical equipment, you can determine a Safe Levels model of this oil immersed type electrical equipment
Enclose, the safe oil temperature and safe oil temperature surplus of this oil immersed type electrical equipment are can determine that according to oil level-oil temperature curve, and it is above-mentioned
Standard oil temperaturet 0 , temperature margin∆t, current oil temperaturetIt is in：t 0— ∆t＜t＜t 0+ ∆tIn the range of when, you can judge the oil immersion
Formula electrical equipment is under safe work state.
It is first after PLC calculates current oil level in fuel tank in this oil-immersed and high-voltage Oil-filled Electrical Equipments position monitoring method
Choosing determines current oil level whether in the safe range set, if oil level exceeds presetting Safe Levels scope,
It is determined whether current oil level is in too high or too low abnormal ranges.As described above, oil level information is entered by oil temperature information
Row embodies.
Step 1012, oil level is too low；
PLC judges that current oil level is too low in fuel tank, is alarmed by warning indicator lamp and buzzer；
In prior art
Step 1013, PLC judges whether to reset；
PLC judges whether to receive the reset signal of reset switch, if reset switch sends reset signal, performs step
1014, otherwise perform step 1015；
Step 1014, warning device stopping is acted；
PLC controls warning indicator lamp and buzzer to be stopped；
Step 1015, warning device is acted；
Warning indicator lamp and buzzer are worked on, and the abnormality to oil level is warned, while will alarm
Information is uploaded to host computer and stored.
The above described is only a preferred embodiment of the present invention, being not the limitation for making other forms to the present invention, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Imitate embodiment.But it is every without departing from technical solution of the present invention content, the technical spirit according to the present invention is to above example institute
Any simple modification, equivalent variations and the remodeling made, still fall within the protection domain of technical solution of the present invention.
Claims (6)
1. a kind of oil-immersed and high-voltage Oil-filled Electrical Equipments position monitoring method, it is characterised in that：
The oil level monitoring method realizes that the system includes the fuel reserve tank set gradually from top to bottom by oil level monitoring system
（2）, insulator（4）And lower fuel tank（7）, fuel reserve tank（2）With lower fuel tank（7）Pass through insulator（4）UNICOM, in lower fuel tank（7）Side
Face is provided with terminal box（5）, in described lower fuel tank（7）Interior bottom is provided with fuel level sensor（8）, fuel level sensor（8）
Power supply and signal wire pass through described terminal box（5）It is connected after extraction with the input port of controller, described controller is
PLC；
Comprise the following steps：
Step a, system starts；
After upper electricity, system normally starts；
Step b, System self-test；
System carries out self-inspection after starting；
Whether step c, System self-test is normal；
PLC judges whether System self-test is normal, if normally, performing step e, if self-inspection is abnormal, performs step d；
Step d, exports fault-signal；
PLC is exported fault-signal, and failure logging is uploaded into host computer stored；
Step e, gathers static pressure signal；
Fuel level sensor（8）Gather the static pressure signal of fuel tank interior insulation oil；
Step f, injection PLC calculates current oil level；
Fuel level sensor（8）The static pressure collected is delivered into PLC, PLC calculates the level height in fuel tank；
Step g, calculates the current oil temperature under the oil levelt；
PLC calculates current oil temperature corresponding under current oil levelt；
Step h, current oil temperaturetWhether the safe oil temperature upper limit is higher than；
PLC judges current oil temperaturetWhether the safe oil temperature upper limit is higher than, if current oil temperaturetHigher than the safe oil temperature upper limit, step is performed
Rapid i, otherwise performs step j；
Step i, oil level is too high；
PLC judges that current oil level is too high in fuel tank, and is alarmed；
Step j, current oil temperaturetWhether safe oil temperature lower limit is less than；
PLC judges current oil temperaturetWhether safe oil temperature lower limit is less than, if current oil temperaturetLess than safe oil temperature lower limit, step is performed
Rapid k, otherwise return to step e；
Step k, oil level is too low；
PLC judges that current oil level is too low in fuel tank, and is alarmed；
Step l, PLC judge whether reset；
PLC judges whether to receive the reset signal of reset switch, if reset switch sends reset signal, PLC control alarms
Device is stopped；If reset switch does not send reset signal, warning device is worked on, and the abnormality to oil level is carried out
Warning, is stored while warning message is uploaded into host computer.
2. oil-immersed and high-voltage Oil-filled Electrical Equipments position monitoring method according to claim 1, it is characterised in that：In step f,
Described PLC calculates the level height in fuel tank according to static pressure-oil level curve.
3. oil-immersed and high-voltage Oil-filled Electrical Equipments position monitoring method according to claim 1, it is characterised in that：In step g,
Described PLC calculates current oil temperature according to oil level-oil temperature curvet。
4. oil-immersed and high-voltage Oil-filled Electrical Equipments position monitoring method according to claim 1, it is characterised in that：In step h,
The described safe oil temperature upper limit is standard oil temperaturet 0 With temperature margin∆tSum.
5. oil-immersed and high-voltage Oil-filled Electrical Equipments position monitoring method according to claim 1, it is characterised in that：In step h,
Described safe oil temperature lower limit is standard oil temperaturet 0 With temperature margin∆tDifference.
6. oil-immersed and high-voltage Oil-filled Electrical Equipments position monitoring method according to claim 1, it is characterised in that：It is provided with connecting
The connected reset key of the controller input/output port is connected on, the output port of controller connects warning device, shown simultaneously
Display screen and host computer.
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| CN105547418B (en) * | 2015-12-07 | 2020-08-28 | 中国电力科学研究院 | Optical fiber type oil level sensor performance detection device and detection method for transformer |
| CN106525194B (en) * | 2016-11-21 | 2019-03-22 | 北京殷图网联科技股份有限公司 | A kind of main transformer oil level method for real-time monitoring equivalent based on limit oil temperature |
| CN111856379B (en) * | 2020-06-24 | 2022-10-04 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Monitoring system of current transformer operating characteristic simulation test platform in low-temperature environment |
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|---|---|---|---|---|
| CN2630068Y (en) * | 2003-05-12 | 2004-08-04 | 株洲时代集团公司 | Roof high voltage mutual inductor for electric locomotive and electric vehicle |
| CN202485744U (en) * | 2012-01-09 | 2012-10-10 | 上海市电力公司 | Oil level indication detection device of transformer |
| CN103674163A (en) * | 2013-12-18 | 2014-03-26 | 中国西电电气股份有限公司 | Oil level monitoring method and monitoring system of oil storage system of oil-immersed transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2922992B1 (en) * | 2007-10-26 | 2010-04-30 | Air Liquide | METHOD FOR REAL-TIME DETERMINATION OF THE FILLING LEVEL OF A CRYOGENIC RESERVOIR |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2630068Y (en) * | 2003-05-12 | 2004-08-04 | 株洲时代集团公司 | Roof high voltage mutual inductor for electric locomotive and electric vehicle |
| CN202485744U (en) * | 2012-01-09 | 2012-10-10 | 上海市电力公司 | Oil level indication detection device of transformer |
| CN103674163A (en) * | 2013-12-18 | 2014-03-26 | 中国西电电气股份有限公司 | Oil level monitoring method and monitoring system of oil storage system of oil-immersed transformer |
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Denomination of invention: Method and system for monitoring oil level of oil-immersed high-voltage electrical apparatus Effective date of registration: 20200717 Granted publication date: 20170801 Pledgee: Industrial and Commercial Bank of China Co.,Ltd. Zibo High tech Branch Pledgor: Shandong Zhong'an Electric Power Technology Co.,Ltd. Registration number: Y2020980004140 |
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