CN2844932Y - System for monitoring external insulation of transformer - Google Patents
System for monitoring external insulation of transformer Download PDFInfo
- Publication number
- CN2844932Y CN2844932Y CN 200520066929 CN200520066929U CN2844932Y CN 2844932 Y CN2844932 Y CN 2844932Y CN 200520066929 CN200520066929 CN 200520066929 CN 200520066929 U CN200520066929 U CN 200520066929U CN 2844932 Y CN2844932 Y CN 2844932Y
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- Prior art keywords
- sensor
- external insulation
- monitoring system
- insulation monitoring
- transformer
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Abstract
The utility model relates to the field for detecting electric devices, particularly a system for monitoring the external insulation of a transformer, which comprises a partial discharging sensor, a medium sensor, an iron-core current sensor and a data acquisition unit connected with the sensors. The system for monitoring the external insulation of a transformer of the utility model is provided with the discharging sensor, the medium sensor and the iron-core current sensor so as to simultaneously detect partial discharging and iron-core grounding current, and in addition, the utility model is provided with a background comprehensive processing unit so as to carry out statistical analysis for acquired data and manage databases.
Description
[technical field]
The utility model relates to the power equipment detection range, relates in particular to a kind of transformer external insulation monitoring system.
[background technology]
Operation power equipment complex monitoring, analysis, diagnosis are the problems that the power department expectation solves always.Especially the accumulation of transformer operational management experience provides a considerable amount of domain-specific knowledges and failure symptom for the foundation of electric power transformer insulated diagnostic expert system, can progressively carry out analysis, judgement, decision-making research to fault, the life-span of operational outfit, thereby reach status monitoring and diagnosis, set up the purpose of predictability maintenance system.The on-line monitoring of power transformer is the important means of reflection equipment running status promptly and accurately, and the Partial Discharge Detection of transformer is the main method of its state of insulation in service of reflection.
The partial discharge of transformer on-line monitoring technique is existing many achievements in research both at home and abroad, and have been applied in the production practices.But facts have proved that most of on-line monitoring equipment is still unresolved to key issues such as on-the-spot interference of on-line monitoring and the inside and outside discharge of differentiating transformer aspects, monitoring system is subjected to on-the-spot disturbing effect big.And also rare both at home and abroad to comprising the sophisticated systems that Transformer's Condition Monitoring that partial discharge monitoring, iron core grounding current on-line monitoring are complete and fault expert diagnosis analyze, many gordian techniquies are still among tackling key problem solves.
[utility model content]
It is a kind of simultaneously to the transformer external insulation monitoring system of shelf depreciation and the online detection of iron core grounding current that the purpose of this utility model is to provide.
It is a kind of simultaneously to shelf depreciation and the online detection of iron core grounding current that another purpose of this utility model is to provide, and the transformer external insulation monitoring system that the data of gathering can be analyzed.
For achieving the above object, the utility model adopts following technical scheme:
A kind of transformer external insulation monitoring system comprises local discharge sensor, medium sensor, iron core current sensor, the data acquisition unit that is connected with the sensor.
Described data acquisition unit comprises analog channel filtering and switch unit, A/D sampled data processing unit, MCU central data processing unit and data communication processing unit.
Described local discharge sensor comprises diameter magnetic core sensor and sensor that electric current is the MA level between 100～200mm.
Described medium sensor is a sensor that electric current is the MA level.
Described iron core current sensor is to comprise a magnetic core made from siliconized plate.
The described iron core current sensor outside is provided with in the shielding case.
Described shielding case comprises internal layer and skin, and above-mentioned internal layer is a siliconized plate, and above-mentioned skin is a stainless steel.
Be provided with epoxy resin between described internal layer and the skin.
Compared with prior art, the utility model transformer external insulation monitoring system can detect shelf depreciation and iron core grounding current simultaneously by discharge sensor, medium sensor and iron core current sensor are set, and can carry out statistical study and data base administration to the data of gathering by overall treatment unit, backstage is set in addition.
[description of drawings]
Fig. 1 is the utility model transformer external insulation monitoring system structural representation;
Fig. 2 a is the current direction synoptic diagram of external interference signals;
Fig. 2 b is the current direction synoptic diagram of local discharge signal;
Fig. 3 is the structural representation of data acquisition unit.
[embodiment]
See also shown in Figure 1ly, a kind of transformer external insulation monitoring system comprises local discharge sensor 1, medium sensor 2, iron core current sensor 3 and the data acquisition unit that is connected with the sensor.For the data that vivider demonstration detects, transformer external insulation monitoring system can also comprise an overall treatment unit, backstage that the data of gathering are carried out statistical study and data base administration.
Data acquisition unit comprises analog channel filtering and switch unit, A/D sampled data processing unit, MCU central data processing unit and data communication processing unit.Local discharge sensor 1 comprises diameter magnetic core sensor and sensor that electric current is the MA level between 100～200mm.Medium sensor 2 also is a sensor that electric current is the MA level.Iron core current sensor 3 comprises a magnetic core made from siliconized plate.
The process of local signal collection comprises the first step: judge undesired signal; Second step: adopt the various different types of interference signals of integrated approach filtering.
See also shown in Figure 2ly, Ck is the equivalent capacitance of transformer outside line and equipment; Cx is the outer equivalent capacitance of transformer decannulation electric capacity; Cb is the electric capacity of bushing; T1 is the current sensor of coupled signal from the bottom shielding of bushing ground wire; T2 is the current sensor from last full skirt of bushing to coupled signal flange.When external interference signals enters transformer, establish the measured signal of this moment T1, T2 two current sensors in the same way; When generation office in inside put, measured signal then was reverse on T1, T2 two current sensors.The polarity differential method is differentiated the direction of two paths of signals promptly according to these characteristics, if the identical undesired signal that then is judged to be of two-way sensor signal direction that monitors; Otherwise, then be judged to be local discharge signal.
The various different types of interference signal methods of filtering are as follows:
At first utilize fft algorithm to carry out the interference of digital filtering filtering fixed frequency;
Adopt the phase place filtering recurrent pulses undesired signal of windowing then;
Follow dynamic thresholding method filter out background noise;
Utilize dual sensor directional couple software (FFT digital filtering algorithm software) to carry out pulse polarity discrimination method (method by phase differential between the dual analog signal is differentiated pulse polarity), filtering randomness impulse disturbances at last.
Utilize medium sensor 2 to detect sleeve pipe dielectric loss and electric capacity.Adopt the sensor acquisition signal of MA level electric current, utilization DSP technology and fft method detect and calculate.
Iron core current sensor 3 detects iron core grounding current, because iron core grounding current is the current signal under the power frequency, we have selected to have the magnetic core that siliconized plate is done iron core current sensor.
In addition, adopt the method for casting epoxy resin that sensor is enclosed in the shielding case fully, play encapsulation and moistureproof, shockproof effect.The internal layer of shielding case is selected silicon steel material for use, and is outer with stainless steel encapsulation shielding, so just effectively solved the anti-interference problem of system under the strong power frequency electromagnetic field condition of transformer station.
The utility model has been introduced a kind of transformer external insulation monitoring system by being example with some sensors, and this can not be considered to the restriction to the utility model claim.If those skilled in the art has made change unsubstantiality, conspicuous or improvement according to the utility model, all should belong to the scope of the utility model claim protection.
Claims (9)
1, a kind of transformer external insulation monitoring system, it is characterized in that: said system comprises local discharge sensor, medium sensor, iron core current sensor and the data acquisition unit that is connected with the sensor.
2, transformer external insulation monitoring system according to claim 1 is characterized in that: described data acquisition unit comprises analog channel filtering and switch unit, A/D sampled data processing unit, MCU central data processing unit and data communication processing unit.
3, transformer external insulation monitoring system according to claim 1 is characterized in that: described local discharge sensor comprises diameter magnetic core sensor and sensor that electric current is the MA level between 100～200mm.
4, transformer external insulation monitoring system according to claim 1 is characterized in that: described medium sensor is a sensor that electric current is the MA level.
5, transformer external insulation monitoring system according to claim 1 is characterized in that: described iron core current sensor is to comprise a magnetic core made from siliconized plate.
6, transformer external insulation monitoring system according to claim 5 is characterized in that: the described iron core current sensor outside is provided with in the shielding case.
7, transformer external insulation monitoring system according to claim 6, it is characterized in that: described shielding case comprises internal layer and skin, and above-mentioned internal layer is a siliconized plate, and above-mentioned skin is a stainless steel.
8, transformer external insulation monitoring system according to claim 7 is characterized in that: be provided with epoxy resin between described internal layer and the skin.
9, a kind of transformer external insulation monitoring system is characterized in that: said system comprises local discharge sensor, medium sensor, iron core current sensor, the data acquisition unit that is connected with the sensor and overall treatment unit, backstage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520066929 CN2844932Y (en) | 2005-11-07 | 2005-11-07 | System for monitoring external insulation of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520066929 CN2844932Y (en) | 2005-11-07 | 2005-11-07 | System for monitoring external insulation of transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2844932Y true CN2844932Y (en) | 2006-12-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520066929 Expired - Fee Related CN2844932Y (en) | 2005-11-07 | 2005-11-07 | System for monitoring external insulation of transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2844932Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162644B (en) * | 2007-09-07 | 2010-06-02 | 中国电力科学研究院 | Local discharge experiment power supply system |
| CN101846719B (en) * | 2009-11-25 | 2012-05-09 | 西安博源电气有限公司 | Transformer insulation state on-line monitoring device |
| CN102565646A (en) * | 2012-01-16 | 2012-07-11 | 广东电网公司电力科学研究院 | Lightning-wave surge-voltage type test device for dry sleeve and frequency band analysis method thereof |
| CN102650654A (en) * | 2012-05-14 | 2012-08-29 | 云南电力试验研究院（集团）有限公司电力研究院 | Operation performance on-line assessment method for power transformer iron core and clamping piece grounding current monitoring device |
| CN103487632A (en) * | 2013-10-11 | 2014-01-01 | 上海飞轩电子有限公司 | Shielded open loop type magnetic gathering ring-free tunneling magnetoresistive sensor |
| CN103558521A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Device for detecting partial discharge of transformer under surge voltage |
| CN103558522A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Method for detecting partial discharge of transformer under surge voltage |
-
2005
- 2005-11-07 CN CN 200520066929 patent/CN2844932Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162644B (en) * | 2007-09-07 | 2010-06-02 | 中国电力科学研究院 | Local discharge experiment power supply system |
| CN101846719B (en) * | 2009-11-25 | 2012-05-09 | 西安博源电气有限公司 | Transformer insulation state on-line monitoring device |
| CN102565646A (en) * | 2012-01-16 | 2012-07-11 | 广东电网公司电力科学研究院 | Lightning-wave surge-voltage type test device for dry sleeve and frequency band analysis method thereof |
| CN102650654A (en) * | 2012-05-14 | 2012-08-29 | 云南电力试验研究院（集团）有限公司电力研究院 | Operation performance on-line assessment method for power transformer iron core and clamping piece grounding current monitoring device |
| CN103487632A (en) * | 2013-10-11 | 2014-01-01 | 上海飞轩电子有限公司 | Shielded open loop type magnetic gathering ring-free tunneling magnetoresistive sensor |
| CN103558521A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Device for detecting partial discharge of transformer under surge voltage |
| CN103558522A (en) * | 2013-11-02 | 2014-02-05 | 国家电网公司 | Method for detecting partial discharge of transformer under surge voltage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20061206 Termination date: 20121107 |