CN105301460B - A kind of test method for studying transformer partial discharge super high frequency signal propagation characteristicses - Google Patents
A kind of test method for studying transformer partial discharge super high frequency signal propagation characteristicses Download PDFInfo
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Abstract
A kind of test method for studying transformer partial discharge super high frequency signal propagation characteristicses, comprises the following steps：According to true type inside transformer structure, sensor and discharge source are determined；The high voltage between source electrode of discharging, inside transformer is set to produce shelf depreciation；Apart from the different opening position install sensor of discharge source, the frequency spectrum of analysis local discharge superhigh frequency signal, phase, the attenuation change situation of time delay；Situation of the shelf depreciation ultra-high frequency signal by winding decay and signal are directly contrasted without winding by the situation that sensor receives, signal Analysis frequency spectrum, phase, Delay Variation；Primary signal is carried out to the contrast of frequency spectrum, phase, time delay from the local discharge superhigh frequency signal after different propagateds, studies the influence that different propagation paths are propagated ultra-high frequency signal.The present invention can more realistically study propagation law and influence factor of the ultra-high frequency signal in transformer, have great importance to the on-line monitoring of transformer partial discharge super high frequency signal in actual motion.
Description
Technical field
The invention belongs to electric equipment test technical field, is related to a kind of research transformer partial discharge super high frequency signal
Test method, it is particularly suitable for use in and experimental study is carried out to the propagation characteristic of ultra-high frequency signal.
Technical background
In the presence of electric field, the breakdown electrical discharge phenomenon in SI semi-insulation region is referred to as shelf depreciation between conductor.
Shelf depreciation is to cause the principal element of transformer insulated premature failure, and Transformer Insulation Aging and the mark of deterioration, because
This experimental study monitored on-line to partial discharge of transformer has important academic significance and application value.
Some electrical phenomenas and non-electrical phenomena can be produced during shelf depreciation, as electromagnetic radiation, electric pulse, sound wave, heating,
Gas etc. is produced, its corresponding monitoring method has ultrahigh frequency monitoring method, pulse current method, monitoring ultrasonic method, temperature prison respectively
Survey method, gas chromatography etc..Wherein ultrahigh frequency monitoring method is because having high sensitivity, abundant information, strong antijamming capability, positioning side
Just many advantages, such as, applied more and more widely in Partial Discharge Online Monitoring of Transformers.
It is complicated yet with inside transformer, when ultra-high frequency signal is propagated wherein caused by shelf depreciation, by
The influence of iron core, insulating board, wire, transformation wall etc., folding, reflection occurs repeatedly.Examined in transformer partial discharge super high frequency
In survey, ultra-high frequency antenna receives the hyper band spatial electromagnetic ripple from point of discharge, various influence local discharge superhigh frequency signals
The factor of folding, reflection and decay, adds the complexity of inside transformer local discharge superhigh frequency signal propagation path, not only may be used
The amplitude and waveform of ultra-high frequency antenna measurement signal can be influenceed, also to miss using the positioning of local discharge superhigh frequency signal
Difference, it is unfavorable for extracting useful information from the testing result of ultra-high frequency signal, adds the difficulty of local discharge superhigh frequency detection.
It is therefore desirable to carry out the experiment of local discharge superhigh frequency signal propagation characteristicses, further investigation ultra-high frequency signal is in inside transformer
Propagation law and influence factor, further develop ultra high frequency detection technology.
At present, the test method for studying local discharge superhigh frequency signal propagation characteristicses is for simplified transformer mould mostly
Type, for example, by oil-filled in metal cabinet and add cardboard or Transformer Winding, distance, cardboard or winding pair in research oil
The influence that ultra-high frequency signal is propagated.Although ultra-high frequency signal can be reflected in inside transformer to a certain extent by these experiments
Propagation characteristic, but because experimental enviroment with true discharge environment differs larger, it is difficult to reflect ultra-high frequency signal under truth
Propagation characteristic in transformer.Therefore, it is necessary to true type transformer test platform is built, by inside transformer placement office
Portion's discharge source, uhf sensor is installed on casing, can more objective to study the propagation characteristic of ultra-high frequency signal
Reflect propagation law of the ultra-high frequency signal in transformer.
In consideration of it, the invention provides a kind of experiment side for studying transformer partial discharge super high frequency signal propagation characteristicses
Method, based on true type transformer test platform, it can more realistically study propagation law and shadow of the ultra-high frequency signal in transformer
The factor of sound, has great importance to the on-line monitoring of transformer partial discharge super high frequency signal in actual motion.
The content of the invention
The technical problems to be solved by the invention are the deficiencies existing for existing test method, propose a kind of new research
The test method of transformer partial discharge super high frequency signal, the test method study superelevation based on true type transformer test platform
The propagation characteristic of frequency signal, more can reflect objective propagation law of the ultra-high frequency signal in transformer and influence because
Element.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of test method for studying transformer partial discharge super high frequency signal propagation characteristicses, it is characterised in that the examination
Proved recipe method comprises the following steps：
Step 1：According to true type inside transformer structure, the installation site of sensor and discharge source is determined；
Step 2：Discharge source is arranged on transformer-cabinet, the high voltage between source electrode of discharging, makes inside transformer
Produce shelf depreciation；
Step 3：Apart from the different opening position install sensor of discharge source, local discharge superhigh frequency is gathered with oscillograph
Signal, the frequency spectrum of analysis local discharge superhigh frequency signal, phase, the attenuation change situation of time delay, plays a game to study distance in oil
The influence that portion's electric discharge ultra-high frequency signal is propagated；
Step 4：Situation of the shelf depreciation ultra-high frequency signal by winding decay and signal are directly passed without winding
The situation that sensor receives is contrasted, and is gathered signal with oscillograph, signal Analysis frequency spectrum, phase, Delay Variation, is studied transformer
The influence that winding is propagated ultra-high frequency signal；
Step 5：Place a sensor near discharge source, the local discharge superhigh frequency that this sensor is received is believed
Number be used as primary signal, and from the local discharge superhigh frequency signal after different propagateds carry out frequency spectrum, phase, time delay pair
Than studying the influence that different propagation paths are propagated ultra-high frequency signal.
The test method of research transformer partial discharge super high frequency signal propagation characteristicses as described above, is still further comprised
Following preferred scheme：
In step 1：According to the internal structure and external dimensions of transformer, using signal propagation path as much as possible as
Principle, determine discharge source and the installation site of sensor on transformer-cabinet.
In step 3：With four road signal ports of oscillograph, collection connects apart from the sensor of discharge source different distance simultaneously
The local discharge superhigh frequency signal received, signal data is imported in computer, the signal time delay change of observation local discharge superhigh frequency
Situation simultaneously carries out FFT, signal Analysis frequency spectrum, phase with distance changing rule.
In step 4：The local discharge superhigh frequency signal that two-way sensor uploads is gathered simultaneously with oscillograph, wherein one
Road is the signal decayed by winding, is the signal directly received without winding by sensor all the way in addition, while as far as possible true
Two sensors are protected to discharge source apart from identical, the changing rule of analysis local discharge superhigh frequency signal.
In step 5：Discharge source is placed on to multiple positions of inside transformer successively, in the position away from its nearest neighbours
Sensor is placed, and using the local discharge superhigh frequency signal that this sensor receives as primary signal, with the tunnel of oscillograph four
Other three paths in passage gather the local discharge superhigh frequency signal after different propagation paths, from the propagation road of signal
The propagation law of signal Analysis in footpath.
The advantage of the invention is that：The invention provides one kind to study transformer partial discharge super high frequency signal propagation characteristicses
Test method.Experiment of this method with traditional simplified style transformer model test platform research ultra-high frequency signal propagation characteristic
Method is compared, and result of the test can reflect propagation law of the ultra-high frequency signal in transformer more objective, this method
Advantage is specific as follows：
1. being based on true type transformer test platform, it is more nearly with true discharge environment, more truly reflection shelf depreciation surpasses
The propagation characteristic of high-frequency signal.
2. due to the diversity of test method, the influence factor that a variety of ultra-high frequency signals are propagated and a variety of propagation
Path is studied, and more comprehensively reflects the propagation law of ultra-high frequency signal.
Brief description of the drawings
Fig. 1 is the test method flow chart of present invention research transformer partial discharge super high frequency signal propagation characteristicses；
Fig. 2 is the schematic diagram for implementing test method of the present invention in 110kV power transformer tests platform.
Embodiment
For a better understanding of the present invention, with reference to the embodiment content that the present invention is furture elucidated.
As shown in figure 1, the present invention provides a kind of experiment side for studying transformer partial discharge super high frequency signal propagation characteristicses
Method, comprise the steps of：
Step 1：According to true type inside transformer structure, the installation site of sensor and discharge source is determined；
According to the internal structure and external dimensions of transformer, using signal propagation path as much as possible as principle, it is determined that becoming
Discharge source and the installation site of sensor on depressor casing.
Step 2：Discharge source is arranged on transformer-cabinet, the high voltage between source electrode of discharging, makes inside transformer
Produce shelf depreciation；
Step 3：Apart from the different opening position install sensor of discharge source, signal is gathered with oscillograph, signal Analysis
Frequency spectrum, phase, the attenuation change situation of time delay, to study the influence that distance is propagated ultra-high frequency signal in oil；
Gather the part received apart from the sensor of discharge source different distance simultaneously with four road signal ports of oscillograph
Discharge ultra-high frequency signal, imports data in computer, and observation signal Delay Variation situation simultaneously carries out FFT, signal Analysis frequency
Spectrum, phase with distance changing rule.
Step 4：Situation about directly being received to situation of the signal by winding decay and signal without winding by sensor
Contrasted, gather signal, signal Analysis frequency spectrum, phase, Delay Variation with oscillograph, research Transformer Winding is believed hyperfrequency
Number propagate influence；
Two-way sensor signal is gathered simultaneously with oscillograph, wherein being the signal decayed by winding all the way, in addition all the way
It is the signal directly received without winding by sensor, while ensures that two sensors apart from identical, divide to discharge source as far as possible
Analyse the changing rule of signal.
Step 5：Place a sensor near power supply placement, using the signal that this sensor receives as original letter
Number, and from after different propagateds signal carry out frequency spectrum, phase, time delay contrast, study different propagation paths to superelevation
The influence that frequency signal is propagated；
Discharge source is placed on to multiple positions of inside transformer successively, in the place sensors away from its nearest neighbours,
And using the signal that this sensor receives as primary signal, warp is gathered with other three paths in the paths of oscillograph four
The local discharge superhigh frequency signal crossed after different propagation paths, the propagation law of signal Analysis from the propagation path of signal.
As shown in Fig. 2 the present embodiment is by taking 110kV power transformer test platforms as an example.
Embodiment is as follows：
1. according to the internal structure and external dimensions of transformer, becoming by principle of signal propagation path as much as possible
Perforate, mounting flange at depressor box location 1-8, electric discharge source model and sensor installation Unified Model are designed, so as to position
Can not only discharge source have been placed at 1-8 but also can place sensor.
2. placing discharge source at position 2, when producing shelf depreciation, sensor at position 3,4 is gathered simultaneously with oscillograph
The signal received, then discharge source is placed at position 8, gathering sensor at position 6,7 simultaneously with oscillograph receives
Signal, import data in computer, observation signal Delay Variation situation simultaneously carries out FFT, signal Analysis frequency spectrum, phase with
The changing rule of distance.
3. placing discharge source at position 2, when producing shelf depreciation, sensor at position 4,8 is gathered simultaneously with oscillograph
The distance of the signal received, position 2 to position 4 and position 8 is essentially identical, can be used for analyzing winding to ultra-high frequency signal biography
Broadcast the influence of characteristic.
4. discharge source is placed at position 2, because the distance and position 2 of position 3 is relatively near, therefore can be by the sensing at position 3
Then the signal that device receives gathers the sensor at position 1,5,6,7,8 and received respectively as primary signal with oscillograph
Signal, study the influence that other a variety of propagation paths are propagated ultra-high frequency signal.
5. similarly, sensor can be individually positioned at the 3-8 of position, the sensor apart from its proximal most position is received
Signal gathers the signal that sensor receives at other positions with oscillograph as primary signal respectively, and to data at
Reason, analyzes influence of the different propagation paths to ultra-high frequency signal, therefrom finds out the rule that ultra-high frequency signal is propagated in transformer
And influence factor.
These are only embodiments of the invention, be not intended to limit the invention, therefore, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements done etc., it should be included within scope of the presently claimed invention.
Claims (3)
- A kind of 1. test method for studying transformer partial discharge super high frequency signal propagation characteristicses, it is characterised in that the experiment Method comprises the following steps：Step 1：According to the internal structure and external dimensions of transformer, using signal propagation path as much as possible as principle, it is determined that Discharge source and the installation site of sensor on transformer-cabinet；Step 2：Discharge source is arranged on transformer-cabinet, the high voltage between source electrode of discharging, produces inside transformer Shelf depreciation；Step 3：Apart from the different opening position install sensor of discharge source, local discharge superhigh frequency signal is gathered with oscillograph, The frequency spectrum of analysis local discharge superhigh frequency signal, phase, the attenuation change situation of time delay, discharged to study the distance portion of playing a game in oil The influence that ultra-high frequency signal is propagated；Step 4：With oscillograph simultaneously gather two-way sensor upload local discharge superhigh frequency signal, wherein be all the way by The signal of winding decay, it is the signal directly received without winding by sensor all the way in addition, while ensures two biographies as far as possible Sensor is to discharge source apart from identical, the changing rule of analysis local discharge superhigh frequency signal；Signal, analysis letter are gathered with oscillograph Number frequency spectrum, phase, Delay Variation, the influence that research Transformer Winding is propagated ultra-high frequency signal；Step 5：Place a sensor near discharge source, the local discharge superhigh frequency signal that this sensor is received is made For primary signal, and the contrast of frequency spectrum, phase, time delay is carried out from the local discharge superhigh frequency signal after different propagateds, Study the influence that different propagation paths are propagated ultra-high frequency signal.
- 2. test method according to claim 1, it is characterised in that：In step 3：With four road signal ports of oscillograph, collection receives apart from the sensor of discharge source different distance simultaneously Local discharge superhigh frequency signal, by signal data import computer in, observe local discharge superhigh frequency signal time delay situation of change And carry out FFT, signal Analysis frequency spectrum, phase with distance changing rule.
- 3. test method according to claim 1 or 2, it is characterised in that：In step 5：Discharge source is placed on to multiple positions of inside transformer successively, placed in the position away from its nearest neighbours Sensor, and using the local discharge superhigh frequency signal that this sensor receives as primary signal, with the paths of oscillograph four In other three paths gather local discharge superhigh frequency signal after different propagation paths, from the propagation path of signal The propagation law of signal Analysis.
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| CN106405341A (en) * | 2016-07-15 | 2017-02-15 | 国网甘肃省电力公司电力科学研究院 | Method used for reducing partial discharge ultrahigh frequency signal |
| CN106093737B (en) * | 2016-08-18 | 2019-02-12 | 广东电网有限责任公司电力科学研究院 | A kind of transformer partial discharge signal propagation characteristics test method and method for diagnosing faults |
| CN110082658A (en) * | 2019-05-30 | 2019-08-02 | 国网上海市电力公司 | Superfrequency-optical signal uniformity test unit and method in GIS |
| CN113702779A (en) * | 2021-08-23 | 2021-11-26 | 国网山东省电力公司电力科学研究院 | Local discharge ultrahigh frequency sensor field calibration method for transformer |
| CN114563663B (en) * | 2022-01-18 | 2024-08-23 | 山东大学 | Experimental device and method for discharging in transformer oil under alternating current voltage |
| CN114966382A (en) * | 2022-04-25 | 2022-08-30 | 国网山西省电力公司电力科学研究院 | Mechanical and electrical combined test system for gas insulated combined electrical apparatus |
| CN114839495B (en) * | 2022-06-30 | 2022-09-20 | 江苏苏能森源电气有限公司 | Transformer partial discharge abnormity detection method based on artificial intelligence |
| CN117310247B (en) * | 2023-11-30 | 2024-03-01 | 深圳市鼎阳科技股份有限公司 | Oscilloscope and power supply probe frequency response compensation method thereof |
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| KR100206662B1 (en) * | 1995-08-28 | 1999-07-01 | 변승봉 | Partial discharge measuring method using frequency spectrum analyzer. |
| CN102323526A (en) * | 2011-08-15 | 2012-01-18 | 重庆大学 | Sensor based on the ultrasonic distribution character of big motor shelf depreciation is provided with analytical approach |
| CN102798806B (en) * | 2012-08-01 | 2015-03-04 | 北京博电新力电气股份有限公司 | Partial discharge detecting method of transformers |
| CN103076546B (en) * | 2013-01-11 | 2014-10-08 | 国家电网公司 | Testing device and method for electromagnetic wave propagation characteristics in gas insulated switchgear (GIS) |
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