CN101738567B - Method for detecting transformer winding state by using constant-current sweep frequency power source excitation - Google Patents

Method for detecting transformer winding state by using constant-current sweep frequency power source excitation Download PDF

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Publication number
CN101738567B
CN101738567B CN2008102033409A CN200810203340A CN101738567B CN 101738567 B CN101738567 B CN 101738567B CN 2008102033409 A CN2008102033409 A CN 2008102033409A CN 200810203340 A CN200810203340 A CN 200810203340A CN 101738567 B CN101738567 B CN 101738567B
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China
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frequency
transformer
vibration
transformer winding
constant
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CN2008102033409A
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Chinese (zh)
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CN101738567A (en
Inventor
姜益民
金之俭
朱子述
饶柱石
傅坚
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上海市电力公司
上海交通大学
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/62Testing of transformers

Abstract

The invention relates to system and method for detecting the transformer winding state by using constant-current sweep frequency power source excitation. A measurement and control analysis module controls sweep frequency power source and applies output constant-current sweep frequency excitation signals by an exciting transformer at a high-voltage side of the transformer to be detected; a vibration sensor measures vibration response signals of a transformer winding to be detected at different excitation frequencies; a vibration signal collector collects and preprocesses the signals measured by the vibration sensor; and the measurement and control analysis nodule carries out spectrum analysis to the received and processed vibration response signal data, displays and records a resonant frequency curve of the transformer winding on a frequency domain, compares with the resonant frequency curve previously measured and recorded as well as the vibration frequency curve of a transformer three-phase coil, and judges the state of the transformer winding to obtain the measuring result. The invention can effectively and sensitively detect the states of looseness or deformation of the transformer winding for prompt repair or replacement so as to avoid a fault of abrupt short circuit of the transformer caused by damage of the winding structure.

Description

Utilize constant-current sweep frequency power source excitation to detect the method for transformer winding state
Technical field
The present invention relates to a kind of system and method that utilizes constant-current sweep frequency power source excitation to detect transformer winding state.
Background technology
Transformer is one of most important equipment in the electric system, and the stability of its operation is great to the power system security influence.Along with the increase day by day of China's net capacity, capacity of short circuit also constantly increases thereupon, and the huge electromagnetic force that the dash current that transformer outlet short circuit forms produces has constituted serious threat to the physical strength and the dynamic stability of Transformer Winding.At present the running environment of substation equipment and circuit allows of no optimist all the time, because of the distortion that external short circuit causes Transformer Winding to be hit to cause, is common faults comparatively in the transformer operational process, and its safe operation to system has caused very big threat.
During transformer generation suddenly-applied short circuit fault, in Transformer Winding, flow through very big short-circuit current, this short-circuit current produces very big electric power on winding under the effect of stray field.Although this transient state duration is very short, transformer still might be damaged.
After transformer suffers sudden short circuit; Loosening or slight deformation possibly at first take place in its winding; Analyze deformation of transformer winding through a large amount of experimental studies and have cumulative effect; If can not in time find and repair for loosening or distortion, the anti-short circuit capability that after the loosening or distortion of transformer is accumulated to a certain degree, can make transformer so declines to a great extent and is suffering also can cause under the less dash current big accident and take place.
Transformer receive take place loosening except meeting when impacting short-circuit current and distortion; This also can occur the complicated mechanical vibration during in operation at transformer under the long term of the magnetostriction of iron core and running current; These factors combine also can make winding that gradual distortion, loose unstable phenomenon take place, thereby causes the anti-short circuit capability decline of transformer and make transformer have potential accident potential.
The distortion of winding can cause the decline of mechanical resistance short-circuit current rush ability on the one hand; Also can cause coil inside minor insulation distance to change on the other hand; Make the local insulation thin spot that occurs; Do the time spent when running into superpotential, winding might take place between cake or turn-to-turn short circuit causes transformer insulated breakdown accident, perhaps causes shelf depreciation owing to local field strength increases; The insulation harm position can enlarge gradually, finally causes transformer broken down accident and causes the further state of affairs and enlarge.
Therefore; In operational process after transformer has experienced the external short circuit accident or in the routine maintenance of operation after a period of time; Whether how to detect Transformer Winding effectively exists loosening and distortion; Thereby judge whether transformer need overhaul processing and seem very important, be an important means that ensures the transformer safe operation, so the detection of deformation of transformer winding is one of present transformer conventional test project.
The detection method to transformer winding state of practical application at present mainly contains following 2 kinds:
1, short circuit impedance method:
The transformer short-circuit impedance is the inner equiva lent impedance of transformer when loaded impedance is zero; Short-circuit impedance be Transformer Winding leakage reactance and resistance vector with; Because DCR of Transformer is very little with respect to leakage reactance numerical value, so the reflection of the short-circuit impedance of transformer mainly is the leakage reactance of Transformer Winding.Theoretical analysis by transformer can be known; Transformer leakage reactance value is that the physical dimension by winding determines; In other words conj.or perhaps by the structures shape of winding; In case Transformer Winding deforms, the leakage reactance of transformer is corresponding in theory also can change, and therefore can reflect indirectly through the detection to the transformer short-circuit impedance whether Transformer Winding inside distortion has taken place.
Generally speaking; After operating transformer has received the impact of short-circuit current; Or when routine inspection regularly, to the short-circuit impedance value that record and original record be compared and judge whether winding distortion has taken place; If the short-circuit impedance value changes greatly, for example be set at variation in the GB and surpass 3%, can confirm that then winding has remarkable distortion.
Fig. 1 is the instrumentation plan of short circuit impedance method, and with the step down side short circuit, the high-pressure side applies trial voltage through pressure regulator, measures corresponding short-circuit voltage U and short-circuit current I, and the short-circuit impedance of transformer is calculated by Z=U/I.
Stipulate according to related standards; Transformer is in the short-circuit impedance testing experiment; Require to measure the short-circuit impedance of each phase; And compare measured short-circuit impedance value in test back and test for data in the past, according to the degree of its variation, as judging by one of whether qualified important evidence of examination Transformer Winding.
From practical situations, short circuit impedance method has been set up standard in the long-term production practice, and criterion is comparatively clear and definite, in international electrical engineering standard IEC60076-5 and GB1095-85, has all clearly provided the criterion of winding deformation degree.But the sensitivity of this method is very low under a lot of situation, and the recall rate of fault is lower, only when coil bulk deformation situation is comparatively serious, can obtain clearer and more definite reflection.
2, frequency response method (FRA method, Frequency Response Analysis):
The ultimate principle of frequency response method is that Transformer Winding is regarded as a distributed parameter network; It constitutes a passive linear two-port network by distribution parameters such as ground capacitance C, vertical electric capacity K, inductance L, and the characteristic of this network can use transfer function H (j ω) to describe on frequency domain.
After the distortion of winding generation local mechanical, corresponding variation can take place in distribution parameters such as its inner distributed inductance L, vertical electric capacity K and ground capacitance C, thereby on the transfer function H (j ω) of network, obtains reflection.Whether the network electrical quantity that the situation of change of therefore analyzing the network transfer function curve of Transformer Winding just can be analyzed inside changes; Thereby infer whether corresponding physical construction distortion has taken place; This is the foundation and the basis of frequency response method test deformation of transformer winding; As shown in Figure 2, be the equivalent two-port network of Transformer Winding.
The test of frequency response method at first is applied to a stable sine sweep voltage signal by an end of examination Transformer Winding; Write down the voltage on this port and other output port then simultaneously thus obtain one group of Frequency Response curve that this is tried winding, that is:
H ( jω ) = V · o V · i
The measurement sensitivity of frequency response method is high than short circuit impedance method, but because the complicacy of its frequency response waveform, and the differentiation of winding situation is needed more experience, and therefore difficult definite quantitative criterion that forms does not form discrimination standard so far.
Above-mentioned two kinds of methods are that to differentiate the Transformer Winding situation at present the most frequently used; Two kinds of methods all are to adopt electric measuring method; Starting point all is based in the situation drag that obviously distortion takes place Transformer Winding the corresponding elements electrical quantity and changes and measure differentiation; It is comparatively suitable that this to Transformer Winding the situation of more significantly being out of shape takes place, but to winding generation slight deformation, the loosening relatively state with torsional deformation that especially Transformer Winding is existed can not provide clearer and more definite judgement; Because the electrical quantity that is reflected under these situation in the equivalent-circuit model does not almost change, the variation of its transport function is also just very little.Yet Transformer Winding is loosening or torsional deformation has very big influence to its anti-short circuit capability, and the situation of therefore studying winding need have the higher method of sensitivity to differentiate.
Summary of the invention
A kind of system and method that utilizes constant-current sweep frequency power source excitation to detect transformer winding state provided by the invention is the elastic system of the complicacy of a lumped parameter with the Transformer Winding equivalence, when Transformer Winding produces loosening; When its axial pre tightening force changes; The natural frequency of the mechanical vibration on its former rank can progressively move to lower frequency direction, and the phenomenon that has the whole amplitude of low-frequency range to increase, and the vibration characteristics of whole elastic system is changed; And Transformer Winding can cause the variation of elastic system structure when deforming; Thereby the vibration characteristics of elastic system is changed, therefore, change through the vibration characteristics that detects elastic system itself effectively; Analyze the variation of the natural resonance frequency curve of Transformer Winding, just can detect the loosening and distortion of Transformer Winding more delicately.
In order to achieve the above object, the invention provides a kind of system that utilizes constant-current sweep frequency power source excitation to detect transformer winding state, it comprises:
The observing and controlling analysis module;
The exciting module, this exciting modular circuit connects said observing and controlling analysis module;
Signal acquisition module, this signal acquisition module circuit connects said observing and controlling analysis module and exciting module;
Described exciting module comprises controlled constant-current sweep frequency power source and the exciting transformer that connects through circuit;
Described signal acquisition module comprises the vibration transducer and the vibration signal collector of circuit connection successively;
Described controlled constant-current sweep frequency power source circuit connects described observing and controlling analysis module; This sweep frequency power source is applied to the high-pressure side of transformer to be detected through exciting transformer with the constant-current sweep frequency pumping signal of output, and simultaneously tested Transformer Winding is exported this constant-current sweep frequency pumping signal;
The amplitude size of the electric current swept frequency excitation signal of described controlled constant-current sweep frequency power source output, the swept frequency range of output frequency and sweep velocity are by described observing and controlling analysis module control adjustment;
Described exciting transformer is as impedance matching;
Described vibration transducer is arranged on the housing of transformer, and it measures the vibration response signal of tested Transformer Winding under different excited frequencies, and the signal that records is transferred to vibration signal collector;
Described vibration signal collector circuit connects described observing and controlling analysis module; Described vibration signal collector is accomplished signals collecting synchronously, anti-is mixed repeatedly digital filtering and to the high-speed cache of signal; The signal that described vibration signal collector records vibration transducer is gathered and pre-service; And the vibration response signal data that obtain after will handling transfer to the observing and controlling analysis module through high-speed bus, and the SF of this vibration signal collector and sampling length are by described observing and controlling analysis module control adjustment;
Described observing and controlling analysis module carries out spectrum analysis to the vibration response signal data that receive; Show and the resonance frequency curve of record Transformer Winding on frequency domain; With the resonance frequency curve that before measured and write down; And the vibration frequency curve of transformer three-phase coil compares, and judges the state of Transformer Winding, obtains measurement result.
The present invention also provides a kind of method of utilizing constant-current sweep frequency power source excitation to detect transformer winding state, comprises following steps:
Step 1, observing and controlling analysis module are provided with the parameter of controlled constant-current sweep frequency power source;
Output current, swept frequency range, frequency sweep frequency interval, frequency sweep change of frequency cycle etc. are set;
Step 2, observing and controlling analysis module are provided with the parameter of vibration transducer and vibration signal collector;
The vibration transducer parameter is set, mainly comprises the sensitivity and the input mode of sensor;
The sample rate of vibration signal collector is set;
Step 3, observing and controlling analysis module are provided with the analytical parameters of vibration response signal;
The analysis frequency range of vibration response signal is set;
Step 4, observing and controlling analysis module output frequency sweep electric current and initial frequency are to controlled constant-current sweep frequency power source;
Step 5, observing and controlling analysis module output excited frequency are to controlled constant-current sweep frequency power source;
Step 6, with the low pressure short circuit in winding of tested transformer;
Step 7, controlled constant-current sweep frequency power source are applied to the high-pressure side of tested transformer through exciting transformer with the constant-current sweep frequency pumping signal, and simultaneously tested Transformer Winding are exported this constant-current sweep frequency pumping signal;
Step 8, vibration transducer are measured the vibration response signal of tested Transformer Winding for the constant-current sweep frequency pumping signal, and the vibration response signal that records is transferred to vibration signal collector;
Step 9, vibration signal collector are sent to the observing and controlling analysis module after the vibration response signal that records is carried out acquisition process;
Step 10, observing and controlling analysis module carry out spectrum analysis to the vibration response signal that receives;
Whether step 11, observing and controlling analysis module judge the frequency of the constant-current sweep frequency pumping signal that controlled constant-current sweep frequency power source is exported greater than the termination frequency that is provided with, if, then increase frequency, jump to step 5, if not, jump to step 12;
Step 12, observing and controlling analysis module are exported the resonance frequency curve of tested Transformer Winding;
Step 13, observing and controlling analysis module are compared the resonance frequency curve of tested Transformer Winding with the recording curve before it, or compare with the frequency curve of transformer three-phase coil, when the Oscillation Amplitude of this frequency curve obviously amplifies; Obviously skew takes place in spectrum peak, when unusual peak value promptly occurring, explains that this Transformer Winding has abnormal response; Judge that Transformer Winding is under the abnomal condition; Take place loosening or distortion, need in time to change, guarantee that circuit does not break down.
The system and method that utilizes constant-current sweep frequency power source excitation to detect transformer winding state provided by the invention; The variation of the natural resonance frequency curve through analyzing Transformer Winding detects the loosening situation of winding; Can detect the loosening and distortion situation of Transformer Winding effectively, in high sensitivity; Maintenance in time or replacing are avoided damaging the fault that causes transformer generation suddenly-applied short circuit because of winding construction.
Description of drawings
Fig. 1 is the instrumentation plan of short circuit impedance method in the background technology;
Fig. 2 is the equivalent two-port network of Transformer Winding in the frequency response method in the background technology;
Fig. 3 is the structural representation that utilizes sweep frequency power source excitation to detect the system of transformer winding state provided by the invention;
Fig. 4 is the process flow diagram that utilizes constant-current sweep frequency power source excitation to detect the method for transformer winding state provided by the invention;
Fig. 5 is that transformer horizontal direction symmetry A compares with C rumble spectrum mutually mutually in the specific embodiment of the invention;
Fig. 6 is a transformer vertical direction symmetry A phase and the C comparison of vibration frequency mutually in the specific embodiment of the invention.
Embodiment
Following according to Fig. 3~Fig. 6, specify embodiment of the present invention:
As shown in Figure 3, the invention provides a kind of system that utilizes constant-current sweep frequency power source excitation to detect transformer winding state, it comprises:
Observing and controlling analysis module 301;
The exciting module, this exciting modular circuit connects said observing and controlling analysis module 301;
Signal acquisition module, this signal acquisition module circuit connect said observing and controlling analysis module 301 and exciting module;
Described exciting module comprises the controlled constant-current sweep frequency power source 201 and exciting transformer 202 that connects through circuit;
Described signal acquisition module comprises the vibration transducer 101 and vibration signal collector 102 of circuit connection successively;
Described vibration transducer 101 adopts DH185 piezoelectric type ICP acceleration transducer, and parameter is following:
Sensitivity: 10mV/m.s -2
Range (m/s 2): 1 * 10 3
Resonance frequency (kHz): 24;
Frequency range (Hz): 0.5~5000;
Laterally than (%): < 5;
Working current (mA): 4~20;
Output impedance (Ω): < 100;
WV (DCV): 18~30;
Working temperature (℃) :-20~100;
Screw thread (mm): M5 is installed;
Physical dimension (mm): Φ 32;
Weight (gram): 100;
Lead-out mode: top anchor leg;
Described vibration signal collector 102 adopts DH5920 Dynamic Signal detecting and analysing system, and parameter is following:
Input impedance: 10M Ω // 40PF;
Input mode: GND, DC, AC;
Input mode: single-ended input, differential input, ICP fit transfer input,
System's accuracy: less than 0.5% (F.S) (preheating is measured after half an hour);
Stiffness of system: 0.05%/h (the same);
The linearity: 0.05% of full scale;
Degree of distortion: be not more than 0.5%;
Maximum analysis frequency range: DC~50kHz;
10,30,100,300,1k, 3k, 10k, eight grades of steppings of PASS (Hz) switch low-pass filter: cutoff frequency (3dB ± 1dB):;
Flatness: less than 0.1dB (in 2/3 cutoff frequency);
Stopband attenuation: greater than-24dB/oct;
Noise: be not more than 5 μ VRMS (the input short circuit is converted to input end) when maximum gain and maximum bandwidth;
Common mode inhibition (CMR): be not less than 100dB;
Common mode voltage (DC or AC peak value): less than ± 10V, DC~60Hz;
Time drift: less than 3 μ V/ hours (import short circuit, preheating is after 1 hour, and constant temperature is converted to input end when maximum gain);
Temperature drift: less than 1 μ V/ ℃ (in the operating temperature range that allows, the input short circuit is converted to input end when maximum gain);
Output potential the: in ± 5V scope, be provided with arbitrarily by the resolution of 1mV;
Analog-to-digital converter resolution: 16;
The integer sampling rate: when 8 passages were worked simultaneously, every path 10,20,50,100,200,500,1k, 2k, 5k, 10k, 20k, 50k, 100k (Hz) stepping switched;
Number of partion frequency: when 8 passages were worked simultaneously, every passage 5,10,20,50,100,200,500,1k, 2k, 5k, 10k, 20k, 50k (Hz) stepping switched;
Anti alias filter:
Filtering mode: every passage is analog filtering+DSP digital filtering independently;
Cutoff frequency: 1/2.56 times of sampling rate, when being set, sampling rate sets simultaneously;
Stopband attenuation: pact-150dB/oct;
Flatness (in the analysis frequency scope): less than ± 0.05dB;
Power supply: 220VAC, and 12VDC (9~18V), power 50W;
Described controlled constant-current sweep frequency power source 201 connects described observing and controlling analysis module 301 through the RS232 interface; This sweep frequency power source 201 is applied to the high-pressure side of transformer 4 to be detected through exciting transformer 202 with the constant-current sweep frequency pumping signal of output, and simultaneously tested Transformer Winding is exported this constant-current sweep frequency pumping signal;
Described controlled constant-current sweep frequency power source 201 adopts the constant current excitation power TVRAS-1 of independent development, the amplitude size of may command output swept frequency excitation electric current, and the swept frequency range of output frequency and sweep velocity are by described observing and controlling analysis module 301 control adjustment;
Described exciting transformer 202 is as impedance matching usefulness, its major parameter:
Capacity: 35kVA, voltage: 380V/3500V, secondary side maximum current are 10A;
Described vibration transducer 101 is arranged on the housing of transformer 4, and it measures the vibration response signal of tested Transformer Winding under different excited frequencies, and the signal that records is transferred to vibration signal collector 102;
Described vibration signal collector 102 connects described observing and controlling analysis module 301 through 1394 interfaces; Described vibration signal collector 102 is accomplished signals collecting synchronously, is anti-ly mixed repeatedly digital filtering and to the high-speed cache of signal; The signal that 102 pairs of vibration transducers of described vibration signal collector record is gathered and pre-service; And the vibration response signal data that obtain after will handling transfer to observing and controlling analysis module 301 through high-speed bus, and the SF of this vibration signal collector 102 and sampling length are by described observing and controlling analysis module 301 control adjustment;
The vibration response signal data that 301 pairs of described observing and controlling analysis modules receive are carried out spectrum analysis; Show and the resonance frequency curve of record Transformer Winding on frequency domain; With the resonance frequency curve that before measured and write down; And the vibration frequency curve of transformer three-phase coil compares, and judges the state of Transformer Winding, obtains measurement result.
As shown in Figure 4, the present invention also provides a kind of method of utilizing constant-current sweep frequency power source excitation to detect transformer winding state, comprises following steps:
Step 1, observing and controlling analysis module 301 are provided with the parameter of controlled constant-current sweep frequency power source 201;
Output current, swept frequency range, frequency sweep frequency interval, frequency sweep change of frequency cycle etc. are set;
Input power supply: 380V/50Hz;
Controlled constant output current: 2A~60A;
Frequency sweep frequency range: 30Hz~500Hz;
Stream time: be no less than 5 hours;
Frequency sweep frequency interval: 1Hz~5Hz;
The frequency sweep change of frequency cycle: 1s~30s;
Step 2, observing and controlling analysis module 301 are provided with the parameter of vibration transducer 101 and vibration signal collector 102;
Vibration transducer 101 parameters are set, mainly comprise the sensitivity and the input mode of sensor;
Sample rate 10Hz~the 100kHz of vibration signal collector 102 is set;
Step 3, observing and controlling analysis module 301 are provided with the analytical parameters of vibration response signal;
Analysis frequency range: DC~50kHz is set;
Step 4, observing and controlling analysis module 301 output frequency sweep electric currents and initial frequency are to controlled constant-current sweep frequency power source 201;
Step 5, observing and controlling analysis module 301 output excited frequencies are to controlled constant-current sweep frequency power source 201;
Step 6, with the low pressure short circuit in winding of tested transformer 4;
Step 7, controlled constant-current sweep frequency power source 201 are applied to the high-pressure side of tested transformer 4 through exciting transformer 202 with the constant-current sweep frequency pumping signal, and simultaneously tested Transformer Winding are exported this constant-current sweep frequency pumping signal;
Step 8, vibration transducer 101 are measured the vibration response signal of tested Transformer Winding for the constant-current sweep frequency pumping signal, and the vibration response signal that records is transferred to vibration signal collector 102;
After step 9,102 pairs of vibration response signals that record of vibration signal collector carry out acquisition process, be sent to observing and controlling analysis module 301;
Step 10,301 pairs of vibration response signals that receive of observing and controlling analysis module carry out spectrum analysis;
Whether step 11, observing and controlling analysis module 301 judge the frequency of the constant-current sweep frequency pumping signal that controlled constant-current sweep frequency power source 201 is exported greater than the termination frequency that is provided with, if, then increase frequency, jump to step 5, if not, jump to step 12;
The resonance frequency curve of step 12, the tested Transformer Winding of observing and controlling analysis module 301 outputs;
Step 13, observing and controlling analysis module 301 are compared the resonance frequency curve of tested Transformer Winding with the recording curve before it, or compare with the frequency curve of transformer three-phase coil, when the Oscillation Amplitude of this frequency curve obviously amplifies; Obviously skew takes place in spectrum peak, when unusual peak value promptly occurring, explains that this Transformer Winding has abnormal response; Judge that Transformer Winding is under the abnomal condition; Take place loosening or distortion, need in time to change, guarantee that circuit does not break down.
Specific embodiment:
In certain transformer station, the A phase low-pressure side of main-transformer suffers short-circuit impact because of the outlet rheology takes place to puncture, pressure relief device protection action, and the back is because of system's allotment reason, and decision puts into operation again.
Before operation, having carried out once having a power failure and having detected, at first having adopted short circuit impedance method to test, short-circuit impedance do not change basically (changing value is less than 0.1%) is found in test; Adopt the FRA method that transformer A phase low pressure winding is carried out test analysis again, finding does not have ANOMALOUS VARIATIONS with former measurement curve contrast.According to the conclusion of these 2 kinds of electrical measuring methods, think the transformer A phase winding coil fault that do not deform.
But, adopt measuring system of the present invention to detect at last, utilize the method for swept frequency excitation rumble spectrum; A phase and C phase winding to the transformer symmetry have been done careful sweep check; Obtain the rumble spectrum correlation curve mutually like Fig. 5 and A shown in Figure 6 and C, the vibration amplitude of finding transformer A phase is compared with symmetrical C and has been amplified several times, and the peak value of frequency spectrum takes place significantly to squint; The unusual peak value of tangible low frequency has appearred, with the C that is not hit mutually frequency spectrum compared obviously unusual.
This shows that the present invention has highly sensitive detection performance.
Test summary report is claimed: on May 24th, 2005, No. 3 main transformer A of Wuwei transformer station of Shanghai UHV (ultra-high voltage) company phase low-pressure side suffers short-circuit impact because of the outlet rheology takes place to puncture, pressure relief device protection action.Because of system's allotment reason, put into operation heavily again.
Morning May 26, power failure detected, and UHV (ultra-high voltage) company adopts short circuit impedance method to test, short-circuit impedance do not change basically (changing value is less than 0.1%).Adopt the FRA method that transformer A phase low pressure winding is carried out test analysis by the East China pilot scale, do not find to have ANOMALOUS VARIATIONS with former measurement curve contrast.The range of influence power supply soon because bus connection switch breaks down need be made judgement immediately to morning on the 26th, can not think the coil fault that deforms according to the conclusion of electrical measuring method, so transformer puts into operation again.
But outage adopts the method for swept frequency excitation rumble spectrum to test by Shanghai Communications University's testing group; Find the A phase vibration amplitude amplification several times of comparing with C; Significantly skew takes place in the peak value of frequency spectrum; Owing to do not have to carry out sweep measurement it is pressed for time at that time carefully, cause to obtain the whole spectrum curve and analyze.
Because this transformer dispatches from the factory early, through maintenance, this is exported short-circuit impact in addition, and pressure relief device has the protection action to take place, and the vibration amplitude of A phase with photograph C is compared obvious increase, so June 2 is out of service with this transformer.
June 7; After No. 3 main transformers in Wuwei station are out of service; Adopt the frequency sweep excitation method that the winding of transformer three-phase has been done careful sweep check; The spectrum curve that Fig. 5 and Fig. 6 record for three-phase relatively can see that tangible unusual peak value has appearred in the frequency spectrum that A vibrates mutually, with the B that is not hit, C mutually frequency spectrum compared obviously unusual.Through the transformer pendant-core examination, the axial pre tightening force of A phase is merely 1/4th of symmetrical C phase, and the result that the frequency sweep excitation method detects obtains checking.

Claims (2)

1. a method of utilizing constant-current sweep frequency power source excitation to detect transformer winding state is characterized in that, comprises following steps:
Step 1, observing and controlling analysis module (301) are provided with the parameter of controlled constant-current sweep frequency power source (201);
Step 2, observing and controlling analysis module (301) are provided with the parameter of vibration transducer (101) and vibration signal collector (102);
Step 3, observing and controlling analysis module (301) are provided with the analytical parameters of vibration response signal;
Step 4, observing and controlling analysis module (301) output frequency sweep electric current and initial frequency are to controlled constant-current sweep frequency power source (201);
Step 5, observing and controlling analysis module (301) output excited frequency are to controlled constant-current sweep frequency power source (201);
Step 6, with the low pressure short circuit in winding of tested transformer (4);
Step 7, controlled constant-current sweep frequency power source (201) are applied to the high-pressure side of tested transformer (4) through exciting transformer (202) with the constant-current sweep frequency pumping signal, and simultaneously tested Transformer Winding are exported this constant-current sweep frequency pumping signal;
Step 8, vibration transducer (101) are measured the vibration response signal of tested Transformer Winding for the constant-current sweep frequency pumping signal, and the vibration response signal that records is transferred to vibration signal collector (102);
Step 9, vibration signal collector (102) are sent to observing and controlling analysis module (301) after the vibration response signal that records is carried out acquisition process;
Step 10, observing and controlling analysis module (301) carry out spectrum analysis to the vibration response signal that receives;
Whether step 11, observing and controlling analysis module (301) judge the frequency of the constant-current sweep frequency pumping signal that controlled constant-current sweep frequency power source (201) is exported greater than the termination frequency that is provided with, if, then increase frequency, jump to step 5, if not, jump to step 12;
The resonance frequency curve of step 12, the tested Transformer Winding of observing and controlling analysis module (301) output;
Step 13, observing and controlling analysis module (301) are compared the resonance frequency curve of tested Transformer Winding with the recording curve before it, or compare with the frequency curve of transformer three-phase coil, when the Oscillation Amplitude of this frequency curve obviously amplifies; Obviously skew takes place in spectrum peak, when unusual peak value promptly occurring, explains that this Transformer Winding has abnormal response; Judge that Transformer Winding is under the abnomal condition; Take place loosening or distortion, need in time to change, guarantee that circuit does not break down.
2. the method for utilizing constant-current sweep frequency power source excitation to detect transformer winding state as claimed in claim 2 is characterized in that,
The parameter that is provided with in the said step 1 is output current, swept frequency range, frequency sweep frequency interval, frequency sweep change of frequency cycle; The parameter that is provided with in the said step 2 is the vibration transducer parameter, comprises the sensitivity and the input mode of sensor, and the sample rate of vibration signal collector (102); The parameter that is provided with in the said step 3 is the analysis frequency range of vibration response signal.
CN2008102033409A 2008-11-25 2008-11-25 Method for detecting transformer winding state by using constant-current sweep frequency power source excitation CN101738567B (en)

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CN2008102033409A CN101738567B (en) 2008-11-25 2008-11-25 Method for detecting transformer winding state by using constant-current sweep frequency power source excitation
PCT/CN2009/000051 WO2010060253A1 (en) 2008-11-25 2009-01-15 The system and method for detecting the state of the transformer winding by utilizing excitation of the constant current sweep frequency power source

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