CN104236702A - System and method for judging interior looseness of power transformer - Google Patents
System and method for judging interior looseness of power transformer Download PDFInfo
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- CN104236702A CN104236702A CN201410436393.0A CN201410436393A CN104236702A CN 104236702 A CN104236702 A CN 104236702A CN 201410436393 A CN201410436393 A CN 201410436393A CN 104236702 A CN104236702 A CN 104236702A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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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)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a system and method for judging interior looseness of a power transformer. The system for judging and initially positioning interior looseness of the power transformer comprises a signal conditioning circuit, a data acquisition instrument, a data analysis module and three vibration sensors, wherein the signal conditioning circuit, the data acquisition instrument and the data analysis module are sequentially connected. The three vibration sensors are connected with the data acquisition instrument through the signal conditioning circuit and measure vibration signals of three phases of the power transformer correspondingly, the vibration signals are amplified, filtered and denoised by the signal conditioning circuit and then transmitted to the data acquisition instrument, the data acquisition instrument transmits the acquired vibration signals to the data analysis module, and the data analysis module stores and processes the vibration signals and carries out fault judgment. The looseness fault of the transformer is judged through 100 Hz signals in the vibration signals according to the characteristic of change of the vibration signals along with the looseness degree.
Description
Technical field
The invention belongs to intelligent substation technical field, particularly power transformer inside loosens judgement system and method thereof.
Background technology
The loosening distortion of electrical transformer cores and winding can produce grave danger to the safe operation of transformer, and therefore, carry out on-line monitoring to transformer operation conditions, Timeliness coverage potential faults has very important significance.It is convenient that Power Transformer Condition monitoring method based on vibration signal realizes, and monitoring system and transformer do not have electrical link, and the equipment that do not affect normally runs.Prior art is studied transformer vibration, and analyzing 100Hz signal in inside transformer iron core fault rear fuel tank vibration signal can change, and analyzes transformer voltage, curent change to the impact of vibration.But because 100Hz signal magnitude is not linear with iron core fault, even do not become monotonic relationshi, inside transformer loosens, some position fundamental vibration frequency component of fuel tank can increase, some position may also reduce, and rule is also indefinite, directly judges still difficulty.By research, 50Hz, 150Hz, 300Hz signal generation significant change after discovery transformer core/winding looseness fault, proposes to carry out core slackness diagnosis based on the relation of 300Hz, 150Hz and 50Hz component in vibration signal, improves diagnostic accuracy.But the overall value of 50Hz, 150Hz, 300Hz signal is very little, higher to vibration monitoring accuracy requirement.
By further research, tank surface vibration signal is vector superposed at tank surface measuring point of the generation vibration signal that respectively vibrates of inside transformer.Vibration signal fundamental component amplitude is except linear with current squaring when the square linear of no-load voltage and load; When phase iron core/winding generation looseness fault a certain in A, B, C three-phase, this phase iron core/winding increases when the vibration signal 100Hz fundamental component Amplitude Ration of fuel tank end face or bottom correspondence position measuring point is normal, and increase with core slackness degree and become large, other two-phase iron core/windings increase with core slackness degree at the vibration amplitude in the oscillation point of fuel tank end face or bottom correspondence position measuring point and first reduce to increase afterwards.Iron core winding can be carried out according to this rule and loosen judgement, and carry out loosening Primary Location.
Summary of the invention
In order to solve the technical matters that background technology exists, the present invention aims to provide power transformer inside and loosens judgement system and method thereof, according to the Variation Features of vibration signal with aeration level, 100Hz signal in vibration signal is utilized to judge the looseness fault of transformer.
Power transformer inside loosens judgement system, and comprise the signal conditioning circuit, data collecting instrument and the data analysis module that connect successively, also comprise 3 vibration transducers, described 3 vibration transducers are connected with data collecting instrument through signal conditioning circuit respectively; Described 3 vibration transducers are the corresponding vibration signal measuring power transformer three-phase respectively, vibration signal sends data collecting instrument to after signal conditioning circuit amplification, filtering and noise reduction, data collecting instrument sends the vibration signal of collection to data analysis module, data analysis module carries out Storage and Processing to vibration signal, and carries out breakdown judge.
The present invention also comprises the loosening determination methods loosening judgement system based on above-mentioned power transformer inside, the method is used for the loosening judgement of electrical transformer cores and Primary Location, and the method is carried out under power transformer no-load running, comprise the following steps, wherein step (1)-(4) loosen threshold value for measuring when determining power transformer non-fault, and step (5)-(6) detect looseness fault in daily servicing:
(1) preset sample frequency and sampling time, data collecting instrument is sampled at least 3 times the vibration signal that each vibration transducer detects continuously;
(2) according to sample frequency and sampling time, the vibration signal that each vibration transducer is sampled at every turn is intercepted complete cycle;
(3) data analysis module carries out filtering process to the vibration signal intercepted complete cycle, then carries out time-frequency conversion, obtains the spectrum component amplitude at 100Hz place in the vibration signal that each vibration transducer samples at every turn;
(4) arithmetic average is got to the spectrum component amplitude at 100Hz place in the vibration signal of each vibration transducer multiple repairing weld, obtain the spectrum component average amplitude at 100Hz place in the vibration signal of each vibration transducer sampling, after this average amplitude is multiplied by certain multiple, obtain the loosening threshold value CR of power transformer tri-phase iron core respectively
1A, CR
1B, CR
1C, and loosening threshold value is stored in data analysis module;
(5) step (1)-(3) are repeated, again the spectrum component amplitude at 100Hz place in the vibration signal that each vibration transducer samples at every turn is obtained, when the spectrum component amplitude at the vibration signal 100Hz place of at least continuous 2 its samplings of a certain vibration transducer is greater than the loosening threshold value of the corresponding phase iron core of this vibration transducer, enter step (6), otherwise return step (5);
(6) in certain vibration signal of sampling of each vibration transducer, the ratio of the loosening threshold value of the spectrum component amplitude phase iron core corresponding to it at 100Hz place is expressed as λ
1A, λ
1Band λ
1C:
When in 3 ratio, maximum ratio is greater than 2, and when all the other 2 ratios are all not more than 1, judge that power transformer exists obvious core slackness, and this phase iron core of power transformer corresponding to maximum ratio exists and loosens;
When in 3 ratio, maximum ratio is greater than 2, and when all the other 2 ratios have at least 1 ratio to be greater than 1, only judge that power transformer exists obvious core slackness;
When maximum ratio is greater than 1 and is less than 2 in 3 ratio, only can judge that power transformer exists small core slackness;
When maximum ratio is not more than 1 in 3 ratio, judge that power transformer does not exist core slackness.
Wherein, the time-frequency conversion in above-mentioned steps (3) adopts Fourier transform.
Wherein, the certain multiple in above-mentioned steps (4) is 1.2 ~ 2 times.
The present invention also comprises the loosening determination methods loosening judgement system based on above-mentioned power transformer inside, the method is used for the loosening judgement of Winding in Power Transformer and Primary Location, and the method is carried out under power transformer load running, comprise the following steps, wherein step (1)-(4) loosen threshold value for measuring when determining power transformer non-fault, and step (5)-(6) detect looseness fault in daily servicing:
(1) preset sample frequency and sampling time, data collecting instrument is sampled at least 3 times the vibration signal that each vibration transducer detects continuously;
(2) according to sample frequency and sampling time, the vibration signal that each vibration transducer is sampled at every turn is intercepted complete cycle;
(3) data analysis module carries out filtering process to the vibration signal intercepted complete cycle, then carries out time-frequency conversion, obtains the spectrum component amplitude at 100Hz place in the vibration signal that each vibration transducer samples at every turn;
(4) arithmetic average is got to the spectrum component amplitude at 100Hz place in the vibration signal of each vibration transducer multiple repairing weld, obtain the spectrum component average amplitude at 100Hz place in the vibration signal of each vibration transducer sampling, after this average amplitude is multiplied by certain multiple, obtain the loosening threshold value CR of power transformer three-phase windings respectively
2A, CR
2B, CR
2C, and loosening threshold value is stored in data analysis module;
(5) step (1)-(3) are repeated, again the spectrum component amplitude at 100Hz place in the vibration signal that each vibration transducer samples at every turn is obtained, when the spectrum component amplitude at the vibration signal 100Hz place of at least continuous 2 its samplings of a certain vibration transducer is greater than the loosening threshold value of the corresponding phase winding of this vibration transducer, enter step (6), otherwise return step (5);
(6) in certain vibration signal of sampling of each vibration transducer, the ratio of the loosening threshold value of the spectrum component amplitude phase winding corresponding to it at 100Hz place is expressed as λ
2A, λ
2Band λ
2C:
When in 3 ratio, maximum ratio is greater than 2, and when all the other 2 ratios are all not more than 1, judge that power transformer exists obvious winding and loosens, and this phase winding of power transformer corresponding to maximum ratio exists and loosens;
When in 3 ratio, maximum ratio is greater than 2, and when all the other 2 ratios have at least 1 ratio to be greater than 1, only judge that power transformer exists obvious winding and loosens;
When maximum ratio is greater than 1 and is less than 2 in 3 ratio, only judge that power transformer exists small winding and loosens;
When maximum ratio is not more than 1 in 3 ratio, judge that power transformer does not exist winding and loosens.
Wherein, when keeping detecting looseness fault, during the load current of power transformer threshold value loosening with measurement, the load current of power transformer is equal.
Wherein, if detect looseness fault time power transformer load current with measure loosen threshold value time power transformer load current there is deviation, then amount to the spectrum component amplitude of vibration signal at 100Hz place with following formula:
In above formula, A
xbe under arbitrary load electric current vibration signal in the spectrum component amplitude at 100Hz place, A
100a
xscaled value, I
2*it is the perunit value of power transformer load current when detecting looseness fault.
Adopt the beneficial effect that technique scheme is brought:
The present invention can judge that electrical transformer cores, winding loosen easily, and can to loosening position Primary Location.Present invention utilizes the component amplitude at 100Hz place in vibration signal, because 100Hz component amplitude in transformer vibration signal is comparatively large, so not high to measuring system accuracy requirement, and antijamming capability is stronger.
Accompanying drawing explanation
Fig. 1 is system architecture diagram of the present invention;
Fig. 2 is the position view of core-hung type power transformer vibration transducer of the present invention.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is described in detail.
System architecture diagram of the present invention as shown in Figure 1, power transformer inside loosens judgement system, comprise the signal conditioning circuit, data collecting instrument and the data analysis module that connect successively, also comprise 3 vibration transducers, described 3 vibration transducers are connected with data collecting instrument through signal conditioning circuit respectively; Described 3 vibration transducers are the corresponding vibration signal measuring power transformer three-phase respectively, vibration signal sends data collecting instrument to after signal conditioning circuit amplification, filtering and noise reduction, data collecting instrument sends the vibration signal of collection to data analysis module, data analysis module carries out Storage and Processing to vibration signal, and carries out breakdown judge.
In the present embodiment, 3 vibration transducer glue are bonded in tank surface securely.When the power transformer detected is core-hung type power transformer, 3 vibration transducers are separately positioned on power transformer tank end face 3 positions corresponding with power transformer three-phase windings, and as shown in Figure 2,1,2, No. 3 is 3 vibration transducer installation sites.When the power transformer detected is for hanging bell-type power transformer, 3 vibration transducers are separately positioned on 3 positions corresponding with power transformer three-phase windings, power transformer tank bottom surface.
The present invention also comprises the determination methods of the core slackness based on said system, and the method is carried out under power transformer no-load running, comprise the following steps, wherein step (1)-(4) loosen threshold value for measuring when determining power transformer non-fault, and step (5)-(6) detect looseness fault in daily servicing:
(1) preset sample frequency and sampling time, data collecting instrument is sampled at least 3 times the vibration signal that each vibration transducer detects continuously;
(2) according to sample frequency and sampling time, the vibration signal that each vibration transducer is sampled at every turn is intercepted complete cycle;
(3) data analysis module carries out filtering process to the vibration signal intercepted complete cycle, then carries out time-frequency conversion, obtains the spectrum component amplitude at 100Hz place in the vibration signal that each vibration transducer samples at every turn;
(4) arithmetic average is got to the spectrum component amplitude at 100Hz place in the vibration signal of each vibration transducer multiple repairing weld, obtain the spectrum component average amplitude at 100Hz place in the vibration signal of each vibration transducer sampling, after this average amplitude is multiplied by certain multiple, obtain the loosening threshold value CR of power transformer tri-phase iron core respectively
1A, CR
1B, CR
1C, and loosening threshold value is stored in data analysis module;
(5) step (1)-(3) are repeated, again the spectrum component amplitude at 100Hz place in the vibration signal that each vibration transducer samples at every turn is obtained, when the spectrum component amplitude at the vibration signal 100Hz place of a certain vibration transducer at least 2 its samplings is greater than the loosening threshold value of the corresponding phase iron core of this vibration transducer, enter step (6), otherwise return step (5);
(6) in certain vibration signal of sampling of each vibration transducer, the ratio of the loosening threshold value of the spectrum component amplitude phase iron core corresponding to it at 100Hz place is expressed as λ
1A, λ
1Band λ
1C:
When in 3 ratio, maximum ratio is greater than 2, and when all the other 2 ratios are all not more than 1, judge that power transformer exists obvious core slackness, and this phase iron core of power transformer corresponding to maximum ratio exists and loosens;
When in 3 ratio, maximum ratio is greater than 2, and when all the other 2 ratios have at least 1 ratio to be greater than 1, only judge that power transformer exists obvious core slackness;
When maximum ratio is greater than 1 and is less than 2 in 3 ratio, only can judge that power transformer exists small core slackness;
When maximum ratio is not more than 1 in 3 ratio, judge that power transformer does not exist core slackness.
In the present embodiment, the time-frequency conversion in above-mentioned steps (3) adopts Fourier transform, and the certain multiple in step (4) is 1.2 ~ 2 times.
The present invention also comprises the determination methods loosened for Winding in Power Transformer, the step of the method is consistent with the judgement that above-mentioned electrical transformer cores loosens and Primary Location method, unique difference is: when judging core slackness, power transformer must be in no-load running state, and when judging that winding loosens, power transformer must be in load operation conditions.
When judging that winding loosens, the load current detecting power transformer during looseness fault should keep equal with the load current of power transformer when measuring loosening threshold value.If cannot keep equal, then need to amount to the spectrum component amplitude of vibration signal at 100Hz place with following formula:
In above formula, A
xbe under arbitrary load electric current vibration signal in the spectrum component amplitude at 100Hz place, A
100a
xscaled value, I
2*it is the perunit value of power transformer load current when detecting looseness fault.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (7)
1. power transformer inside loosens judgement system, it is characterized in that: comprise the signal conditioning circuit, data collecting instrument and the data analysis module that connect successively, also comprise 3 vibration transducers, described 3 vibration transducers are connected with data collecting instrument through signal conditioning circuit respectively; Described 3 vibration transducers are the corresponding vibration signal measuring power transformer three-phase respectively, vibration signal sends data collecting instrument to after signal conditioning circuit amplification, filtering and noise reduction, data collecting instrument sends the vibration signal of collection to data analysis module, data analysis module carries out Storage and Processing to vibration signal, and carries out breakdown judge.
2. loosen the loosening determination methods of judgement system based on power transformer inside described in claim 1, it is characterized in that: the method is used for the loosening judgement of electrical transformer cores and Primary Location, and the method is carried out under power transformer no-load running, comprises the following steps:
(1) preset sample frequency and sampling time, data collecting instrument is sampled at least 3 times the vibration signal that each vibration transducer detects continuously;
(2) according to sample frequency and sampling time, the vibration signal that each vibration transducer is sampled at every turn is intercepted complete cycle;
(3) data analysis module carries out filtering process to the vibration signal intercepted complete cycle, then carries out time-frequency conversion, obtains the spectrum component amplitude at 100Hz place in the vibration signal that each vibration transducer samples at every turn;
(4) arithmetic average is got to the spectrum component amplitude at 100Hz place in the vibration signal of each vibration transducer multiple repairing weld, obtain the spectrum component average amplitude at 100Hz place in the vibration signal of each vibration transducer sampling, after this average amplitude is multiplied by certain multiple, obtain the loosening threshold value CR of power transformer tri-phase iron core respectively
1A, CR
1B, CR
1C, and loosening threshold value is stored in data analysis module;
(5) when needs carry out loosening detection to power transformer, repeat step (1)-(3), again the spectrum component amplitude at 100Hz place in the vibration signal that each vibration transducer samples at every turn is obtained, when the spectrum component amplitude at the vibration signal 100Hz place of at least continuous 2 its samplings of a certain vibration transducer is greater than the loosening threshold value of the corresponding phase iron core of this vibration transducer, enter step (6), otherwise return step (5);
(6) in certain vibration signal of sampling of each vibration transducer, the ratio of the loosening threshold value of the spectrum component amplitude phase iron core corresponding to it at 100Hz place is expressed as λ
1A, λ
1Band λ
1C:
When in 3 ratio, maximum ratio is greater than 2, and when all the other 2 ratios are all not more than 1, judge that power transformer exists obvious core slackness, and this phase iron core of power transformer corresponding to maximum ratio exists and loosens;
When in 3 ratio, maximum ratio is greater than 2, and when all the other 2 ratios have at least 1 ratio to be greater than 1, only judge that power transformer exists obvious core slackness;
When maximum ratio is greater than 1 and is less than 2 in 3 ratio, only can judge that power transformer exists small core slackness;
When maximum ratio is not more than 1 in 3 ratio, judge that power transformer does not exist core slackness.
3. loosen the loosening determination methods of judgement system according to claim 2 based on power transformer inside, it is characterized in that: the time-frequency conversion in step (3) adopts Fourier transform.
4. loosen the loosening determination methods of judgement system according to claim 2 based on power transformer inside, it is characterized in that: the certain multiple in step (4) is 1.2 ~ 2 times.
5. loosen the loosening determination methods of judgement system based on power transformer inside described in claim 1, it is characterized in that: the method is used for the loosening judgement of Winding in Power Transformer and Primary Location, and the method is carried out under power transformer load running, comprises the following steps:
(1) preset sample frequency and sampling time, data collecting instrument is sampled at least 3 times the vibration signal that each vibration transducer detects continuously;
(2) according to sample frequency and sampling time, the vibration signal that each vibration transducer is sampled at every turn is intercepted complete cycle;
(3) data analysis module carries out filtering process to the vibration signal intercepted complete cycle, then carries out time-frequency conversion, obtains the spectrum component amplitude at 100Hz place in the vibration signal that each vibration transducer samples at every turn;
(4) arithmetic average is got to the spectrum component amplitude at 100Hz place in the vibration signal of each vibration transducer multiple repairing weld, obtain the spectrum component average amplitude at 100Hz place in the vibration signal of each vibration transducer sampling, after this average amplitude is multiplied by certain multiple, obtain the loosening threshold value CR of power transformer three-phase windings respectively
2A, CR
2B, CR
2C, and loosening threshold value is stored in data analysis module;
(5) when needs carry out loosening detection to power transformer, repeat step (1)-(3), again the spectrum component amplitude at 100Hz place in the vibration signal that each vibration transducer samples at every turn is obtained, when the spectrum component amplitude at the vibration signal 100Hz place of at least continuous 2 its samplings of a certain vibration transducer is greater than the loosening threshold value of the corresponding phase winding of this vibration transducer, enter step (6), otherwise return step (5);
(6) in certain vibration signal of sampling of each vibration transducer, the ratio of the loosening threshold value of the spectrum component amplitude phase winding corresponding to it at 100Hz place is expressed as λ
2A, λ
2Band λ
2C:
When in 3 ratio, maximum ratio is greater than 2, and when all the other 2 ratios are all not more than 1, judge that power transformer exists obvious winding and loosens, and this phase winding of power transformer corresponding to maximum ratio exists and loosens;
When in 3 ratio, maximum ratio is greater than 2, and when all the other 2 ratios have at least 1 ratio to be greater than 1, only judge that power transformer exists obvious winding and loosens;
When maximum ratio is greater than 1 and is less than 2 in 3 ratio, only judge that power transformer exists small winding and loosens;
When maximum ratio is not more than 1 in 3 ratio, judge that power transformer does not exist winding and loosens.
6. loosen the loosening determination methods of judgement system according to claim 5 based on power transformer inside, it is characterized in that: when keeping detecting looseness fault, during the load current of power transformer threshold value loosening with measurement, the load current of power transformer is equal.
7. the loosening determination methods of judgement system is loosened according to claim 5 based on power transformer inside, it is characterized in that: if detect looseness fault time power transformer load current with measure loosen threshold value time power transformer load current there is deviation, then amount to the spectrum component amplitude of vibration signal at 100Hz place with following formula:
In above formula, A
xbe under arbitrary load electric current vibration signal in the spectrum component amplitude at 100Hz place, A
100a
xscaled value, I
2*it is the perunit value of power transformer load current when detecting looseness fault.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410436393.0A CN104236702B (en) | 2014-08-29 | 2014-08-29 | Loosened inside power transformer and judge system and method |
| PCT/CN2015/070754 WO2016029629A1 (en) | 2014-08-29 | 2015-01-15 | System and method for judging interior looseness of power transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410436393.0A CN104236702B (en) | 2014-08-29 | 2014-08-29 | Loosened inside power transformer and judge system and method |
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| CN104236702A true CN104236702A (en) | 2014-12-24 |
| CN104236702B CN104236702B (en) | 2017-09-19 |
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