CN204064351U - A kind of monitoring diagnosis device of power transformer - Google Patents
A kind of monitoring diagnosis device of power transformer Download PDFInfo
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- CN204064351U CN204064351U CN201420577443.2U CN201420577443U CN204064351U CN 204064351 U CN204064351 U CN 204064351U CN 201420577443 U CN201420577443 U CN 201420577443U CN 204064351 U CN204064351 U CN 204064351U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 84
- 238000003745 diagnosis Methods 0.000 title claims abstract description 22
- 238000004891 communication Methods 0.000 claims abstract description 22
- 238000004587 chromatography analysis Methods 0.000 claims abstract description 16
- 238000007405 data analysis Methods 0.000 claims abstract description 16
- 238000004804 winding Methods 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 18
- 230000008569 process Effects 0.000 abstract description 14
- 238000000605 extraction Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- General Physics & Mathematics (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The utility model discloses a kind of monitoring diagnosis device of power transformer, comprise electric power transformer insulated situation on-line monitoring equipment; Power transformer voltage, electric current and load comprehensive monitoring equipment; Power transformer oil chromatography real-time watch device; Power transformer running temperature on-line monitoring equipment; Partial Discharge in Power Transformer on-line monitoring equipment; By the treatment facility that communication interface is connected with described electric power transformer insulated situation on-line monitoring equipment, described power transformer voltage, electric current and load comprehensive monitoring equipment, described power transformer oil chromatography real-time watch device, described power transformer running temperature on-line monitoring equipment and described Partial Discharge in Power Transformer on-line monitoring equipment; The display device be connected with the output terminal of described treatment facility.This device to the large data analysis process monitored, and can carry out comprehensive comprehensive descision to power transformer.
Description
Technical field
The utility model relates to electricity transformer monitoring technical field, particularly relates to a kind of monitoring diagnosis device of power transformer.
Background technology
Power transformer is the critical elements of electric system, is one of equipment most crucial in electric system, plays an important role in voltage transformation, power distribution.As the visual plant supplied in power transformation circuit, the normal operation of power transformer is the important guarantee of power system security, reliability service, so be the requisite work ensureing that supply network normally runs to the detection and diagnosis of Operation Condition of Power Transformers, the security incident occurred because of potential safety hazard effectively can be avoided.
At present, need the parameter of reflection Operation Condition of Power Transformers is carried out to comprehensive monitoring analysis and diagnosed, and the data volume of carrying out monitoring is very large, it is a kind of typical Large data types, and can only carry out detection and diagnosis to the single operational factor that self obtains to each monitoring device of Operation Condition of Power Transformers Real-Time Monitoring now, this can cause each monitoring device can only reflect the local feature of power transformer, finally can not carry out comprehensive comprehensive descision to Operation Condition of Power Transformers.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of monitoring diagnosis device of power transformer, to realize carrying out comprehensive comprehensive descision to Operation Condition of Power Transformers.
For solving the problems of the technologies described above, the utility model provides a kind of monitoring diagnosis device of power transformer, diagnoses for Monitoring Power Transformer.
A monitoring diagnosis device for power transformer, comprising:
The electric current that the iron core of described power transformer, folder ground wire flow through is gathered and obtains the electric power transformer insulated situation on-line monitoring equipment of the first image data;
The busbar voltage of described power transformer and load current are gathered and obtain the power transformer voltage of the second image data, electric current and load comprehensive monitoring equipment;
The data of described electric power transformer oil are gathered and obtains the power transformer oil chromatography real-time watch device of the 3rd image data;
The running temperature of oil in described power transformer and the running temperature of winding are gathered and obtain the power transformer running temperature on-line monitoring equipment of the 4th image data;
The shelf depreciation quantity of information of described Winding in Power Transformer is gathered and obtains the Partial Discharge in Power Transformer on-line monitoring equipment of the 5th image data;
Be connected with described electric power transformer insulated situation on-line monitoring equipment, described power transformer voltage, electric current and load comprehensive monitoring equipment, described power transformer oil chromatography real-time watch device, power transformer running temperature on-line monitoring equipment and described Partial Discharge in Power Transformer on-line monitoring equipment by communication interface, and obtain the treatment facility of described first image data, described second image data, described 3rd image data, described 4th image data and described 5th image data;
The display device be connected with the output terminal of described treatment facility, the comprehensive diagnos report for the described power transformer operation conditions provided after described treatment facility is carried out analyzing and processing according to described first image data, described second image data, described 3rd image data, described 4th image data and described 5th image data shows.
Preferably, described treatment facility comprises PC.
Preferably, described treatment facility comprises data analyzer.
Preferably, described power transformer oil chromatography real-time watch device comprises chromatograph.
Preferably, described display device is data analysis panel board.
Preferably, also comprise: the panalarm be connected with described treatment facility, for carrying out alarm indication to the alarming result in described treatment facility.
Preferably, described panalarm comprises alarm lamp.
Preferably, described panalarm is alarm.
The monitoring diagnosis device of power transformer disclosed in the utility model embodiment, treatment facility is by communication interface and electric power transformer insulated situation on-line monitoring equipment, power transformer voltage, electric current and load comprehensive monitoring equipment, power transformer oil chromatography real-time watch device, power transformer running temperature on-line monitoring equipment and Partial Discharge in Power Transformer on-line monitoring equipment are connected, obtain described first image data, described second image data, described 3rd image data, described 4th image data and described 5th image data, and to drawing the comprehensive diagnos report of power transformer operation conditions after these large data analysis process, the report of described comprehensive diagnos is shown by display device, this device can to the large data analysis process monitored, and comprehensive comprehensive descision can be carried out to power transformer.
Accompanying drawing explanation
In order to the technical scheme of clearer explanation the utility model embodiment or prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of Fig. 1 a kind of monitoring diagnosis device of power transformer disclosed in the utility model embodiment;
Fig. 2 is the structural representation of the monitoring diagnosis device of the utility model embodiment another power transformer disclosed;
Fig. 3 is the structural representation of the monitoring diagnosis device of the utility model embodiment another power transformer disclosed.
Embodiment
Core of the present utility model is to provide a kind of monitoring diagnosis device of power transformer, to realize carrying out comprehensive comprehensive descision to Operation Condition of Power Transformers.
In order to make those skilled in the art person understand the utility model scheme better, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Please refer to Fig. 1, the structural representation of Fig. 1 a kind of monitoring diagnosis device of power transformer disclosed in the utility model embodiment.
The concrete structure of the monitoring diagnosis device of this power transformer comprises: electric power transformer insulated situation on-line monitoring equipment 101, power transformer voltage, electric current and load comprehensive monitoring equipment 102, power transformer oil chromatography real-time watch device 103, power transformer running temperature on-line monitoring equipment 104, Partial Discharge in Power Transformer on-line monitoring equipment 105, treatment facility 106 and display device 107.
Treatment facility 106 is connected with electric power transformer insulated situation on-line monitoring equipment 101 by communication interface, the electric current that electric power transformer insulated situation on-line monitoring equipment 101 flows through for the iron core to power transformer, folder ground wire gathers, obtain the first image data, and described first image data is sent to treatment facility 106 by communication interface.
Treatment facility 106 is connected with power transformer voltage, electric current and load comprehensive monitoring equipment 102 by communication interface, power transformer voltage, electric current and load comprehensive monitoring equipment 102 are for gathering the busbar voltage of power transformer and load current, obtain the second image data, and described second image data is sent to treatment facility 106 by communication interface.
Treatment facility 106 is connected with power transformer oil chromatography real-time watch device 103 by communication interface, power transformer oil chromatography real-time watch device 103 is for gathering the data of electric power transformer oil, obtain the 3rd image data, and described 3rd image data is sent to treatment facility 106 by communication interface.
Treatment facility 106 is connected with power transformer running temperature on-line monitoring equipment 104 by communication interface, power transformer running temperature on-line monitoring equipment 104 is for gathering the running temperature of oil in described power transformer and the running temperature of winding, obtain the 4th image data, and described 4th image data is sent to treatment facility 106 by communication interface.
Treatment facility 106 is connected with Partial Discharge in Power Transformer on-line monitoring equipment 105 by communication interface, Partial Discharge in Power Transformer on-line monitoring equipment 105 is for gathering the shelf depreciation quantity of information of Winding in Power Transformer, obtain the 5th image data, and described 5th image data is sent to treatment facility 106 by communication interface.
Treatment facility 106 is nucleus equipments of this device, treatment facility 106 gets described first image data, described second image data, described 3rd image data, described 4th image data and described 5th image data by communication interface, the total data kind that these collect is many and data volume is large, it is a kind of typical Large data types, treatment facility 106 to these data analysis process, can draw the comprehensive diagnos report of power transformer operation conditions.
Display device 107 is connected with treatment facility 106, and the comprehensive diagnos report that treatment facility 106 pairs of power transformer operation conditionss can provide by display device 107 shows.
In the process of this device work, carry out following steps:
Step S10: electric power transformer insulated situation on-line monitoring equipment 101 gathers the electric current that the iron core of described power transformer, folder ground wire flow through, and obtains the first image data; Power transformer voltage, electric current and load comprehensive monitoring equipment 102 gather the busbar voltage of described power transformer and load current, and obtain the second image data; Power transformer oil chromatography real-time watch device 103 gathers the data of described electric power transformer oil, and obtains the 3rd image data; Power transformer running temperature on-line monitoring equipment 104 gathers the running temperature of oil in described power transformer and the running temperature of winding, and obtains the 4th image data; The shelf depreciation quantity of information of Partial Discharge in Power Transformer on-line monitoring equipment 105 to described Winding in Power Transformer gathers and obtains the 5th image data;
Step S20: treatment facility 106 obtains described first image data, described second image data, described 3rd image data, described 4th image data and described 5th image data by communication interface and carries out analyzing and processing, and the comprehensive diagnos report obtaining described power transformer operation conditions is sent to display device 107;
In step S20, first treatment facility 106 obtains described first image data, described second image data, described 3rd image data, described 4th image data and described 5th image data by communication interface; Secondly treatment facility 106 carries out Characteristic Extraction to described first image data, described second image data, described 3rd image data, described 4th image data and described 5th image data, obtains described first image data, described second image data, described 3rd image data, described 4th image data and described 5th image data characteristic of correspondence numerical quantity separately; Then treatment facility 106 contrasts characteristic quantity numerical value described in each and default characteristic quantity numerical value, and obtains each comparing result; Last treatment facility 106 gathers the comprehensive diagnos report that comparing result described in each generates described power transformer operation conditions;
Further, the current value that the characteristic quantity numerical value that treatment facility 106 obtains after carrying out Characteristic Extraction to described first image data comprises the iron core of power transformer, folder ground wire flows through is at the effective value in each moment, maximal value and rate of change; The characteristic quantity numerical value that treatment facility 106 obtains after carrying out Characteristic Extraction to described second image data comprises the load current value of power transformer, active power, reactive power and applied power; The characteristic quantity numerical value that treatment facility 106 obtains after carrying out Characteristic Extraction to described 3rd image data comprises the chromatogram value of electric power transformer oil; The characteristic quantity numerical value that treatment facility 106 obtains after carrying out Characteristic Extraction to described 4th image data comprises the running temperature values of electric power transformer oil, the running temperature values of Winding in Power Transformer and rate temperature change; The characteristic quantity numerical value that treatment facility 106 obtains after carrying out Characteristic Extraction to described 5th image data comprises the waveform of the shelf depreciation of Winding in Power Transformer, discharge capacity and discharge period.
Further, when treatment facility 106 contrasts the characteristic quantity numerical value obtained in described first image data, the method adopted has two kinds, one method is: the reference value that the characteristic quantity numerical value obtained in described first image data and technical manual provide contrasted, obtain comparing result, and if ground current value is less than 10mA, " mA " represents the unit of current value, when folder electric current is less than 100mA, produces alarming result, then report to the police; Another kind method is: the numerical value when characteristic quantity numerical value obtained in described first image data and power transformer initially being installed contrasts, obtain comparing result, if and deviation is more than 10%, produce alarming result, report to the police, if rate of change is greater than for 1%/moon, produces alarming result, report to the police; When treatment facility 106 contrasts the characteristic quantity numerical value obtained in described second image data, the ratings of the characteristic quantity numerical value obtained in described second image data and power transformer is contrasted, obtain comparing result, if and exceed the ratings of power transformer, then produce alarming result, report to the police; When treatment facility 106 is diagnosed the characteristic quantity numerical value obtained in described 3rd image data, the chromatogram value of electric power transformer oil and initial value are contrasted, obtain comparing result, and if deviation more than 10%, produce alarming result, report to the police.
Same, when treatment facility 106 is diagnosed the characteristic quantity numerical value obtained in described 4th image data, the running temperature of the characteristic quantity numerical value obtained in described 4th image data and the specified permission of power transformer is contrasted, obtain comparing result, and if exceed the running temperature of the specified permission of power transformer, produce alarming result, report to the police, if the rate of change that temperature rises is greater than 1 DEG C/h, produces alarming result, report to the police; When treatment facility 106 is diagnosed the characteristic quantity numerical value obtained in described 5th image data, the characteristic quantity numerical value obtained in described 5th image data and national standard are contrasted, obtain comparing result, if and exceed national standard, produce alarming result, report to the police, if deviation is more than 10%, produce alarming result, report to the police.
Further, treatment facility 106 is after obtaining described first image data, described second image data, described 3rd image data, described 4th image data and described 5th image data by communication interface, before carrying out analyzing and processing, Noise and Interference filtering is carried out to these data, eliminate noise data and interfering data like this, improve the accuracy of the comprehensive diagnos report of described power transformer operation conditions.
Step S30: the comprehensive diagnos report that display device 107 receives described power transformer operation conditions shows.
Wherein, operating personnel are reported by the comprehensive diagnos of display device 107 real time inspection power transformer operation conditions, understand the integrated operation situation of power transformer in time, when power transformer breaks down, carry out associative operation in time, solve fault.
In the monitoring diagnosis device of power transformer disclosed in the utility model embodiment, treatment facility 106 is by communication interface and electric power transformer insulated situation on-line monitoring equipment 101, power transformer voltage, electric current and load comprehensive monitoring equipment 102, power transformer oil chromatography real-time watch device 103, power transformer running temperature on-line monitoring equipment 104 and Partial Discharge in Power Transformer on-line monitoring equipment 105 are connected, obtain described first image data, described second image data, described 3rd image data, described 4th image data and described 5th image data, and to drawing the comprehensive diagnos report of power transformer operation conditions after these large data analysis process, the report of described comprehensive diagnos is shown by display device 107, this device visible can to the large data analysis process monitored, and comprehensive comprehensive descision can be carried out to transformer.
Preferably, based on the monitoring diagnosis device of power transformer disclosed in above-mentioned utility model embodiment, shown in figure 2, treatment facility 106 comprises PC 116, use PC 116 can to the described large data analysis process of collecting, and travelling speed is fast and efficiency is high; Power transformer oil chromatography real-time watch device 103 comprises chromatograph 113, uses chromatograph to gather described 3rd image data, can obtain the chromatogram analysis data of transformer oil; Display device 107 is data analysis panel board 117, and usage data analyser dial plate shows comprehensive diagnos report, and result is accurately clear.
In this embodiment, PC 116 is by communication interface and described electric power transformer insulated situation on-line monitoring equipment 101, described power transformer voltage, electric current and load comprehensive monitoring equipment 102, described chromatograph 113, described power transformer running temperature on-line monitoring equipment 104 and described Partial Discharge in Power Transformer on-line monitoring equipment 105 are connected, obtain described first image data, described second image data, described 3rd image data, described 4th image data and described 5th image data, and to rapidly and efficiently drawing the comprehensive diagnos report of power transformer operation conditions after these large data analysis process, the report of described comprehensive diagnos is shown exactly by data analysis panel board 117 is clear, this device visible can to the large data analysis process monitored, and comprehensive comprehensive descision can be carried out to transformer.
Preferably, based on the monitoring diagnosis device of power transformer disclosed in above-mentioned utility model embodiment, shown in figure 3, treatment facility 106 is data analyzer 126, usage data analyser 126 can to the described large data analysis process of collecting, analytic process accuracy is higher, and this device also comprises: the panalarm 128 be connected with treatment facility 106, for carrying out alarm indication to the alarming result in described treatment facility.Wherein, panalarm 128 comprises alarm lamp, and when there is alarming result in treatment facility 106, alarm lamp starts to continue flicker, and this alarming result is carried out alarm indication, and alert implements solution immediately; Panalarm 128 comprises alarm, and when there is alarming result in the comprehensive diagnos report that treatment facility 106 obtains, alarm starts to continue to blow a whistle, and this alarming result is carried out alarm indication, and alert implements solution immediately.
In this embodiment, data analyzer 126 is by communication interface and described electric power transformer insulated situation on-line monitoring equipment 101, described power transformer voltage, electric current and load comprehensive monitoring equipment 102, described chromatograph 113, described power transformer running temperature on-line monitoring equipment 104 and described Partial Discharge in Power Transformer on-line monitoring equipment 105 are connected, obtain described first image data, described second image data, described 3rd image data, described 4th image data and described 5th image data, and after analyzing and processing is accurately carried out to these large data, draw the comprehensive diagnos report of power transformer operation conditions, the panalarm 128 be connected with treatment facility 106 can carry out alarm indication to the alarming result occurred in treatment facility 106, the report of described comprehensive diagnos is shown by display device 107, this device visible can to the large data analysis process monitored, and comprehensive comprehensive descision can be carried out to transformer.
In sum, based on the monitoring diagnosis device of power transformer disclosed in above-mentioned utility model embodiment, treatment facility is by communication interface and electric power transformer insulated situation on-line monitoring equipment, power transformer voltage, electric current and load comprehensive monitoring equipment, power transformer oil chromatography real-time watch device, power transformer running temperature on-line monitoring equipment and Partial Discharge in Power Transformer on-line monitoring equipment are connected, display device is connected with the output terminal for the treatment of facility, the detection and diagnosis device of this power transformer can to the large data analysis process monitored, and comprehensive comprehensive descision can be carried out to transformer.
Above a kind of Operation Condition of Power Transformers provided by the utility model and trouble-shooter are described in detail.Apply specific case herein to set forth principle of the present utility model and embodiment, the explanation of above embodiment just understands method of the present utility model and core concept thereof for helping.Should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model principle, can also carry out some improvement and modification to the utility model, these improve and modify and also fall in the protection domain of the utility model claim.
Claims (8)
1. a monitoring diagnosis device for power transformer, is characterized in that, comprising:
The electric current that the iron core of described power transformer, folder ground wire flow through is gathered and obtains the electric power transformer insulated situation on-line monitoring equipment of the first image data;
The busbar voltage of described power transformer and load current are gathered and obtain the power transformer voltage of the second image data, electric current and load comprehensive monitoring equipment;
The data of oil in described power transformer are gathered and obtain the power transformer oil chromatography real-time watch device of the 3rd image data;
The running temperature of oil in described power transformer and the running temperature of winding are gathered and obtain the power transformer running temperature on-line monitoring equipment of the 4th image data;
The shelf depreciation quantity of information of described Winding in Power Transformer is gathered and obtains the Partial Discharge in Power Transformer on-line monitoring equipment of the 5th image data;
Be connected with described electric power transformer insulated situation on-line monitoring equipment, described power transformer voltage, electric current and load comprehensive monitoring equipment, described power transformer oil chromatography real-time watch device, power transformer running temperature on-line monitoring equipment and described Partial Discharge in Power Transformer on-line monitoring equipment by communication interface, and obtain the treatment facility of described first image data, described second image data, described 3rd image data, described 4th image data and described 5th image data;
The display device be connected with the output terminal of described treatment facility, the comprehensive diagnos report for the described power transformer operation conditions provided after described treatment facility is carried out analyzing and processing according to described first image data, described second image data, described 3rd image data, described 4th image data and described 5th image data shows.
2. device as claimed in claim 1, it is characterized in that, described treatment facility comprises PC.
3. device as claimed in claim 1, it is characterized in that, described treatment facility comprises data analyzer.
4. device as claimed in claim 1, it is characterized in that, described power transformer oil chromatography real-time watch device comprises chromatograph.
5. device as claimed in claim 1, it is characterized in that, described display device is data analysis panel board.
6. device as claimed in claim 5, is characterized in that, also comprise: the panalarm be connected with described treatment facility, for carrying out alarm indication to the alarming result in described treatment facility.
7. device as claimed in claim 6, it is characterized in that, described panalarm comprises alarm lamp.
8. device as claimed in claim 6, it is characterized in that, described panalarm is alarm.
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| CN201420577443.2U CN204064351U (en) | 2014-10-08 | 2014-10-08 | A kind of monitoring diagnosis device of power transformer |
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| CN201420577443.2U CN204064351U (en) | 2014-10-08 | 2014-10-08 | A kind of monitoring diagnosis device of power transformer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266679A (en) * | 2014-10-08 | 2015-01-07 | 国家电网公司 | Method and device for monitoring and diagnosing power transformer |
| CN104678268A (en) * | 2015-03-06 | 2015-06-03 | 云南电网有限责任公司电力科学研究院 | 500 kV high-voltage parallel reactor turn-to-turn insulating state evaluating system |
| CN105466488A (en) * | 2015-11-23 | 2016-04-06 | 北京必可测科技股份有限公司 | Intelligent visualized on-line monitoring system |
| CN106647555A (en) * | 2015-11-03 | 2017-05-10 | 北京宇翔恒通科贸有限公司 | Chromatographic monitoring system and chromatographic monitoring method |
| CN107703406A (en) * | 2017-09-28 | 2018-02-16 | 浙江群力电气有限公司 | A kind of power transformer iron core grounding monitor method and system |
-
2014
- 2014-10-08 CN CN201420577443.2U patent/CN204064351U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266679A (en) * | 2014-10-08 | 2015-01-07 | 国家电网公司 | Method and device for monitoring and diagnosing power transformer |
| CN104678268A (en) * | 2015-03-06 | 2015-06-03 | 云南电网有限责任公司电力科学研究院 | 500 kV high-voltage parallel reactor turn-to-turn insulating state evaluating system |
| CN106647555A (en) * | 2015-11-03 | 2017-05-10 | 北京宇翔恒通科贸有限公司 | Chromatographic monitoring system and chromatographic monitoring method |
| CN105466488A (en) * | 2015-11-23 | 2016-04-06 | 北京必可测科技股份有限公司 | Intelligent visualized on-line monitoring system |
| CN107703406A (en) * | 2017-09-28 | 2018-02-16 | 浙江群力电气有限公司 | A kind of power transformer iron core grounding monitor method and system |
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