CN106970297A - A kind of online test method of the deformation of transformer winding based on vibration - Google Patents
A kind of online test method of the deformation of transformer winding based on vibration Download PDFInfo
- Publication number
- CN106970297A CN106970297A CN201710376709.5A CN201710376709A CN106970297A CN 106970297 A CN106970297 A CN 106970297A CN 201710376709 A CN201710376709 A CN 201710376709A CN 106970297 A CN106970297 A CN 106970297A
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- deformation
- transformer
- winding
- vibration
- signal
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Classifications
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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
- G01R31/72—Testing of electric windings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
Abstract
The invention discloses a kind of online test method of the deformation of transformer winding based on vibration, include PC processing modules, data collecting instrument, signal translation interface, current transformer and vibrating sensor, wherein vibrating sensor and current transformer difference signal translation interface is connected with data collecting instrument, and vibrator is distributed in the tank surface of transformer places respectively, data collecting instrument gathers the vibration signal that each road vibrating sensor detects and is sent to PC processing modules, PC is handled the vibration signal and current value of collection, calculate, storage, and carry out the judgement of winding deformation degree.The present invention, with the variation characteristic of deformation of transformer winding degree, deformation of transformer winding situation is judged using 100Hz ~ 600Hz signals in vibration signal according to the amplitude sum of vibration signal.This method can realize the real-time online detection of deformation of transformer winding situation, and vibration signal reacts very sensitive to winding deformation, it is easy to popularization and application.
Description
Technical field
The invention belongs to the technical field of power transformer, more particularly to a kind of deformation of transformer winding based on vibration
Online test method.
Background technology
Power transformer is one of important electrical of power system, and can transformer safe and stable operation greatly shadow
Ring the safe operation of whole power network.Deformation of transformer winding is to influence the key factor of its safe and stable operation, is divided according to statistics
Analysis, deformation of transformer winding accounts for more than the 60% of transformer fault, therefore the on-line checking for carrying out winding deformation is to ensure that electric power becomes
One of important measures of depressor safe operation.
Power transformer is in normal course of operation, and the winding of its all parts, particularly transformer will bear higher
The effect of voltage, high-intensity magnetic field and mechanical load, thermic load, particularly when being impacted by external short circuit, Transformer Winding will
Bear from uneven huge electric power axially and radially, cause winding deformation, and then produce more serious transformer event
Barrier.
Detection method currently for deformation of transformer winding mainly includes short circuit impedance method, Low Voltage Impulse Method, frequency sound
Answer method etc..Short circuit impedance method is the change based on measuring transformer leakage inductance, though on-line checking can be realized, sensitivity is relatively low；It is low
Pressure impulse method is to judge winding deformation by comparing the response wave shape of the action of low-voltage pulse of application, but easily by electromagnetic interference, is repeated
Property is poor；Frequency response method mainly differentiates winding deformation by measuring and comparing the frequency response of transformer, and this method can
To reduce the interference of electromagnetism, repeatability is higher, but is easily influenceed by uncertain factor.Therefore, how transformer is improved
The problem of sensitivity of winding deformation detection, the interference for reducing electromagnetism and foeign element are current urgent need to resolve.
The content of the invention
For problems of the prior art, it is high, small, more accurate by ectocine that the present invention provides a kind of sensitivity
Efficiently, and the online test method of the small deformation of transformer winding based on vibration of difficulty a kind of is put into practice.
In order to solve the above technical problems, the present invention provides a kind of deformation of transformer winding on-line checking side based on vibration
Method, comprises the following steps：
Step one：The sample frequency and duration of setting signal acquisition module, continuous 3 collection transformer diverse locations shake
The load current of dynamic signal and transformer, vibration signal is by being arranged in obtained by the vibrating sensor sampling of transformer diverse location；
Step 2：Host computer PC is filtered after processing to the vibration signal collected, utilizes FFT
(FFT) time-frequency conversion is carried out to the signal after processing, obtains 100Hz~600Hz frequencies in each sampled signal frequency spectrum of No. 3 sensors
The amplitude of each component of section；
Step 3：To 100Hz~600Hz frequency range internal vibration signals in every 3 sampled signal frequency spectrums of road vibrating sensor
Whole component amplitudes are summed and converted, and obtain each component amplitude sum X of each sampled signal frequency spectrum of every road vibrating sensori
(i=1,2,3), by XiIt is multiplied by coefficient lambda and obtains deformation of transformer winding threshold values Yi, and by above-mentioned winding deformation threshold values and now
Load current I is stored in PC signal processing modules；
Step 4：In the normal O＆M of power transformer, repeat step (1)~(3) retrieve No. 3 vibrating sensors
Continuous 3 sampled results, if it is continuous 2 times sampling vibration signals spectrographs in 100Hz~600Hz frequency range internal vibration signals whole
Component amplitude sum xiReduced valueMore than the winding deformation threshold values Y of the positioniWhen, into step (5), otherwise return to (4)；
Step 5：Each component at 100Hz~600Hz frequency ranges in the vibration signals spectrograph of certain sampling of each road vibrating sensor
The reduced value of sumWinding deformation threshold values Y at the corresponding power transformer positioniRatio be designated as k respectivelyi(i
=1,2,3).According to ratio kiSize judge winding deformation degree at the position.
Further, 3 vibrating sensors described in step one are fixed on power transformer tank top surface, respectively
The surface of center between each phase high pressure winding and low pressure winding.
Further, the coefficient lambda described in step 3 takes 1.5~2.
Further, described in step 4, new reduced valueCarry out as the following formula：
In above formula, xiFor in vibration signals spectrograph under arbitrary load electric current 100Hz~600Hz frequency range internal vibration signals it is complete
Partial amount amplitude sum,For xiReduced value.The load current i of power transformer is with setting winding deformation threshold values when M is O＆M
When measured load current I ratio.
Further, what the deformation of transformer winding degree described in step 5 differentiated comprises the following steps that：Work as ratio ki
When≤1.3, the Transformer Winding of the vibrating sensor present position is normal, does not deform；When ratio 1.3<kiWhen≤2.5,
Slight deformation occurs for the Transformer Winding of the vibrating sensor present position；When ratio 2.5<kiWhen≤3.6, the vibrating sensor
Medium deformation occurs for the Transformer Winding of present position；ki>When 3.6, the Transformer Winding hair of the vibrating sensor present position
Raw gross distortion.
The detection method relies on system, and system includes PC signal processing modules, data collecting instrument, signal converting means
Put, vibrating sensor and current transformer；Vibrating sensor is connected through chromacoder with data collecting instrument；Data collecting instrument
The signal that each vibrating sensor is collected is respectively sent to PC signal processing modules, signal is handled by PC, calculated,
Storage, and carry out fault verification.
Compared with prior art, the advantage of the invention is that：
The present invention can realize the on-line checking of deformation of transformer winding degree；In the vibration signal of transformer, 100Hz
~600Hz frequency ranges (100Hz is fundamental frequency, and remaining is high fdrequency component) interior component amplitude is bigger than the component amplitude in frequency range around, around
Group is using 100Hz as fundamental frequency, and vibration amplitude is proportional to square of electric current, therefore utilizes amplitude operation feelings different from the relation pair of electric current
Vibration amplitude under condition carries out conversion calculating；FFT can quickly and efficiently calculate each road amplitude components it
The reduced value of sum；The frequency band that vibration signal energy is concentrated, can relatively accurately reflect the deformation extent of Transformer Winding；
Detecting system does not have electrical link with transformer, and the not normal operation to power transformer is impacted；The work of the detection method
Journey practicality is stronger, it is easy to popularization and application；The method is clear, directly perceived, effective.
Brief description of the drawings
Fig. 1 is system architecture diagram of the invention；
Fig. 2 is three vibrating sensor schematic view of the mounting position in the present invention；
Fig. 3 carries out the overview flow chart of winding deformation degree on-line checking for the present invention；
Fig. 4 is vibration signal power spectrum chart when winding deformation does not occur for No. 1 point position of transformer；
Fig. 5 is vibration signal power spectrum chart when winding deformation occurs for No. 1 point position of transformer.
Embodiment
With reference to the accompanying drawings and detailed description, the present invention is furture elucidated.
Fig. 1 show the system architecture diagram that the present invention is embodied, and mainly includes PC signal processing modules, data acquisition
Instrument, chromacoder, 3 vibrating sensors and a current transformer.Wherein 3 vibrating sensors are changed through signal respectively
Device is connected with data collecting instrument.And 3 vibrating sensors are individually positioned in the top of oil-tank surface of power transformer, difference position
The surface of center between each phase high pressure winding and low pressure winding, data collecting instrument collects each vibrating sensor
Signal is respectively sent to PC signal processing modules, and signal is handled by PC, calculate, stored, and carries out fault verification.
In the present embodiment, 3 vibrating sensors are firmly adsorbed in transformer oil box top and winding pair by magnet
3 positions answered, as shown in Fig. 21,2, No. 3 positions placed for 3 vibrating sensors.Wherein A, B, C be high-pressure side, a, b,
C, 0 are low-pressure side.
Present invention additionally comprises the online test method of the deformation of transformer winding based on vibration, this method is used in transformer
During on load operation, the on-line checking of winding deformation degree is carried out.Specific implementation step is as follows：
Step one：The sample frequency and duration of setting signal acquisition module, continuous 3 collection transformer diverse locations shake
The load current of dynamic signal and transformer, vibration signal is by being arranged in obtained by the vibrating sensor sampling of transformer diverse location；
Step 2：Host computer PC to collection road to vibration signal be filtered after processing, utilize FFT
(FFT) time-frequency conversion is carried out to the signal after processing, obtains 100Hz~600Hz frequencies in each sampled signal frequency spectrum of No. 3 sensors
The amplitude of each component of section；
Step 3：To 100Hz~600Hz frequency range internal vibration signals in every 3 sampled signal frequency spectrums of road vibrating sensor
Whole component amplitudes are summed and converted, and obtain each component amplitude sum X of each sampled signal frequency spectrum of every road vibrating sensori
(i=1,2,3), by XiIt is multiplied by coefficient lambda and obtains deformation of transformer winding threshold values Yi, and by above-mentioned winding deformation threshold values and now
Load current I is stored in PC signal processing modules；
Step 4：In the normal O＆M of power transformer, repeat step (1)~(3) retrieve No. 3 vibrating sensors
Continuous 3 sampled results, if it is continuous 2 times sampling vibration signals spectrographs in 100Hz~600Hz frequency range internal vibration signals whole
Component amplitude sum xiReduced valueMore than the winding deformation threshold values Y of the positioniWhen, into step (5), otherwise return to (4)；
Step 5：Each component at 100Hz~600Hz frequency ranges in the vibration signals spectrograph of certain sampling of each road vibrating sensor
The reduced value of sumWinding deformation threshold values Y at the corresponding power transformer positioniRatio be designated as k respectivelyi(i
=1,2,3).According to ratio kiSize judge winding deformation degree at the position.
Wherein, described in step 4, reduced valueCarry out as the following formula：
In above formula, xiFor in vibration signals spectrograph under arbitrary load electric current 100Hz~600Hz frequency range internal vibration signals it is complete
Partial amount amplitude sum,For xiReduced value.The load current i of power transformer with setting winding with becoming when M is normal O＆M
Measured load current I ratio (situation about being loaded when i and I is according to transformer station high-voltage side bus, be slightly different) during shape threshold values.
Further, what the deformation of transformer winding degree described in step 5 differentiated comprises the following steps that：Work as ratio ki
When≤1.3, the Transformer Winding of the vibrating sensor present position is normal, does not deform；When ratio 1.3<kiWhen≤2.5,
Slight deformation occurs for the Transformer Winding of the vibrating sensor present position；When ratio 2.5<kiWhen≤3.6, the vibrating sensor
Medium deformation occurs for the Transformer Winding of present position；ki>When 3.6, the Transformer Winding hair of the vibrating sensor present position
Raw gross distortion.
Fig. 4, Fig. 5 are respectively signal power collection of illustrative plates when winding deformation does not occur and occurs winding deformation for No. 1 test point.It is right
It is can be seen that than Fig. 4 and Fig. 5 when winding deformation occurs for No. 1 test point of transformer, vibration signal 100Hz~600Hz frequency ranges
Signal can substantially increase, and can judge that Transformer Winding is deformed accordingly.
Embodiments of the invention is the foregoing is only, is not intended to limit the invention.All principles in the present invention
Within, the equivalent substitution made should be included in the scope of the protection.The content category that the present invention is not elaborated
In prior art known to this professional domain technical staff.
Claims (6)
1. a kind of online test method of the deformation of transformer winding based on vibration, it is characterised in that this method is in power transformer
Carried out under device on load operation, including following 5 steps：
(1) sample frequency and duration of setting signal acquisition module, the vibration signal of continuous 3 collections transformer diverse location and
The load current of transformer, vibration signal is by being arranged in obtained by the vibrating sensor sampling of transformer diverse location；
(2) PC signal processing modules are filtered after processing to the vibration signal collected, are utilized FFT (FFT)
Time-frequency conversion is carried out to the signal after processing, 100Hz~600Hz frequency ranges in each sampled signal frequency spectrum of No. 3 sensors are obtained each
The amplitude of component；
(3) to whole components of 100Hz~600Hz frequency range internal vibration signals in every 3 sampled signal frequency spectrums of road vibrating sensor
Amplitude is summed and converted, and obtains each component amplitude sum X of each sampled signal frequency spectrum of every road vibrating sensoriI=1,2,
3, by XiIt is multiplied by coefficient lambda and obtains deformation of transformer winding threshold values YiI=1,2,3, and by above-mentioned winding deformation threshold values and now
Load current I is stored in PC signal processing modules；
(4) during the normal O＆M of power transformer, repeat step (1)~(3) retrieve No. 3 vibrating sensors continuous 3
Secondary sampled result, if the whole of 100Hz~600Hz frequency range internal vibration signals is divided in the vibration signals spectrograph of continuous 2 samplings
Measure amplitude sum xiReduced valueMore than the winding deformation threshold values Y of the positioniWhen, into step (5), otherwise return to (4)；
(5) in the vibration signals spectrograph of certain sampling of each road vibrating sensor at 100Hz~600Hz frequency ranges each component sum folding
Calculation valueWinding deformation threshold values Y at the corresponding power transformer positioniRatio be designated as k respectivelyiI=1,2,3,
According to ratio kiSize judge winding deformation degree at the position.
2. a kind of deformation of transformer winding online test method based on vibration according to claim 1, it is characterised in that
3 described vibrating sensors are fixed on power transformer tank top surface, respectively positioned at each phase high pressure winding and low pressure around
The surface of center between group.
3. a kind of deformation of transformer winding online test method based on vibration according to claim 1, it is characterised in that
Coefficient lambda in step (3) takes 1.5~2.
4. a kind of deformation of transformer winding online test method based on vibration according to claim 1, it is characterised in that
In step (4), reduced valueCarry out as the following formula：
In above formula, xiFor the whole point of 100Hz~600Hz frequency range internal vibration signals in vibration signals spectrograph under arbitrary load electric current
Amplitude sum is measured,For xiReduced value；The load current i of power transformer is with setting winding deformation threshold values when M is normal O＆M
When measured load current I ratio.
5. a kind of deformation of transformer winding online test method based on vibration according to claim 1, it is characterised in that
For comprising the following steps that winding deformation degree differentiates in the step (5)：Work as ratio kiWhen≤1.3, the vibrating sensor
The Transformer Winding of present position is normal, does not deform；When ratio 1.3<kiWhen≤2.5, the vibrating sensor present position
Transformer Winding occur slight deformation；When ratio 2.5<kiWhen≤3.6, the Transformer Winding of the vibrating sensor present position
Generation medium deformation；ki>When 3.6, gross distortion occurs for the Transformer Winding of the vibrating sensor present position.
6. a kind of deformation of transformer winding online test method based on vibration according to claim 1, it is characterised in that
The detection method relies on system, and system is passed comprising PC signal processing modules, data collecting instrument, chromacoder, vibration
Sensor and current transformer；Vibrating sensor is connected through chromacoder with data collecting instrument；Data collecting instrument is by each vibration
The signal that sensor is collected is respectively sent to PC signal processing modules, and signal is handled by PC, calculate, stored, and
Carry out fault verification.
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| CN201710376709.5A CN106970297A (en) | 2017-05-25 | 2017-05-25 | A kind of online test method of the deformation of transformer winding based on vibration |
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| CN201710376709.5A CN106970297A (en) | 2017-05-25 | 2017-05-25 | A kind of online test method of the deformation of transformer winding based on vibration |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200349A (en) * | 2021-11-23 | 2022-03-18 | 国网山西省电力公司电力科学研究院 | Transformer winding deformation degree evaluation device and method based on uninterrupted power supply detection |
| CN114485379A (en) * | 2022-01-27 | 2022-05-13 | 重庆电子工程职业学院 | Transformer winding on-line monitoring method |
| CN114485540A (en) * | 2022-01-20 | 2022-05-13 | 西安交通大学 | Method and system for rapidly acquiring deformation degree and position of transformer winding |
| CN117390408A (en) * | 2023-12-13 | 2024-01-12 | 西电济南变压器股份有限公司 | Power transformer operation fault detection method and system |
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| CN102798798A (en) * | 2012-08-07 | 2012-11-28 | 浙江大学 | Power transformer winding deformation detection method based on vibration analysis |
| CN202735425U (en) * | 2012-06-13 | 2013-02-13 | 江苏省电力公司南京供电公司 | Power transformer fault detection system based on vibration |
| CN105092024A (en) * | 2015-08-24 | 2015-11-25 | 江苏省电力公司南京供电公司 | On-line monitoring method and on-line monitoring system for axial pressing state of electric power transformer winding |
| CN105223444A (en) * | 2015-10-20 | 2016-01-06 | 国家电网公司 | The inner local overheating of oil-filled transformer judges and heat spot localization method |
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| CN202735425U (en) * | 2012-06-13 | 2013-02-13 | 江苏省电力公司南京供电公司 | Power transformer fault detection system based on vibration |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200349A (en) * | 2021-11-23 | 2022-03-18 | 国网山西省电力公司电力科学研究院 | Transformer winding deformation degree evaluation device and method based on uninterrupted power supply detection |
| CN114200349B (en) * | 2021-11-23 | 2023-10-13 | 国网山西省电力公司电力科学研究院 | Transformer winding deformation degree evaluation method based on uninterrupted power supply detection |
| CN114485540A (en) * | 2022-01-20 | 2022-05-13 | 西安交通大学 | Method and system for rapidly acquiring deformation degree and position of transformer winding |
| CN114485379A (en) * | 2022-01-27 | 2022-05-13 | 重庆电子工程职业学院 | Transformer winding on-line monitoring method |
| CN117390408A (en) * | 2023-12-13 | 2024-01-12 | 西电济南变压器股份有限公司 | Power transformer operation fault detection method and system |
| CN117390408B (en) * | 2023-12-13 | 2024-02-06 | 西电济南变压器股份有限公司 | Power transformer operation fault detection method and system |
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Application publication date: 20170721 |