CN104237705B - Diagnostic method of multi-information fusion online monitoring device for windings of power transformers - Google Patents
Diagnostic method of multi-information fusion online monitoring device for windings of power transformers Download PDFInfo
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- CN104237705B CN104237705B CN201410526010.9A CN201410526010A CN104237705B CN 104237705 B CN104237705 B CN 104237705B CN 201410526010 A CN201410526010 A CN 201410526010A CN 104237705 B CN104237705 B CN 104237705B
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Abstract
The invention discloses a multi-information fusion online monitoring device and a diagnostic method for windings of power transformers. The multi-information fusion online monitoring device comprises a voltage sensor, a current sensor, a vibration acceleration sensor, a phase shift amplifier circuit, a signal conditioning circuit, an A/D (analog/digital) conversion control circuit, a DSP (digital signal processor), a dual-port RAM (random access memory) and an MCU (microprogrammed control unit). The diagnostic method includes acquiring three-phase primary-side voltage signals, three-phase secondary-side voltage signals, three-phase primary-side current signals and three-phase mechanical vibration signals of the power transformers; processing the signals; performing FFT (fast Fourier transform) decomposition on various phases of mechanical vibration digital signals to obtain amplitude values of fundamental frequencies of various phases of mechanical vibration signals; building online short-circuit reactance models; computing short-circuit reactance of various phases of windings of the power transformers; diagnosing mechanical vibration faults of the transformers by the aid of fitting results of the short-circuit reactance of the various phases of windings, effective current values and the amplitude values of the fundamental frequencies of the mechanical vibration signals corresponding to the effective current values.
Description
Technical field
The invention belongs to diagnosing fault of power transformer technical field and in particular to Multi-information acquisition power transformer around
Group on-Line Monitor Device and diagnostic method.
Background technology
Power transformer is one of important power transmission and transforming equipment in power system, connects multiple electric pressures, in electrical network
It is in hinge status.The security reliability that it runs directly affects the operation safety of electrical network, and the operation improving power transformer can
By property, the safe and reliable operation tool of whole electrical network is of great significance.
Power Transformer Faults include mechanical breakdown, insulation fault, overheating fault etc., and most insulation faults are by mechanical breakdown
Cause.Belong to winding internal mechanical fault with regard in the statistical report of large-scale power transformer fault about more than 60%, lead to
Cross statistical analysiss and draw and the main composition portion that the mechanical breakdown that causes is transformer fault such as loosen because of winding deformation, winding compression
Point, therefore in order to can guarantee that the security reliability of transformer station high-voltage side bus, the research carrying out Transformer Winding running status seems particularly
Important
The current winding failure diagnostic method adopting is mainly frequency response analysis and short-circuit reactance test method(s), two kinds of sides
Method requires transformator rear offline inspection out of service it is impossible to the situation of real-time monitoring transformer station high-voltage side bus.Although vibration analysis method
On-line monitoring can be carried out to transformator, but the method has high demands to surrounding, transformer station high-voltage side bus operating mode and ambient temperature etc.
Factor all can produce a very large impact to the vibration measurement result of transformator.Comprehensive existing several diagnostic methods can be seen that works as
Front Winding in Power Transformer on-line fault diagnosis draw diagnostic result just with single or certain several test parameters, and exist examines
Break signal unification is it is impossible to the problem of comprehensive monitoring Winding in Power Transformer operation conditions.
Content of the invention
According to the deficiencies in the prior art, the present invention proposes the Winding in Power Transformer on-Line Monitor Device of Multi-information acquisition
And diagnostic method.
The technical scheme is that
The Winding in Power Transformer on-Line Monitor Device of Multi-information acquisition, including voltage sensor, current sensor, vibration
Acceleration transducer, phase shift amplifying circuit, signal conditioning circuit, a/d conversion control circuit, dsp, twoport ram and mcu (micro-control
Unit processed).
The outfan of the outfan of voltage sensor, the outfan of current sensor and vibration acceleration sensor connects respectively
Connect the input of phase shift amplifying circuit, the outfan of phase shift amplifying circuit connects the input of signal conditioning circuit, signal condition
The outfan of circuit connects the input of a/d conversion control circuit, and the outfan of a/d conversion control circuit connects the input of dsp
End, dsp and mcu is attached by twoport ram.
Current sensor and voltage sensor connect the Current Transformer Secondary side of transformer station, voltage transformer secondary respectively
Side.
Vibration acceleration sensor is installed on the correspondence position in fuel tank sidewall for the power transformer three-phase windings.
Described phase shift amplifying circuit be used for the signal of collection is decoupled and Filtering Processing, including operational amplifier,
First electric capacity, the second electric capacity, the 3rd electric capacity, feedback resistance, the first slide rheostat and the second slide rheostat, operational amplifier
Input two reversal connections of parallel connection diode, the outfan of operational amplifier connects one end of the 3rd electric capacity, the 3rd electric capacity
The other end is grounded, and the input of operational amplifier is also connected with one end of the first slide rheostat, the first slide rheostat another
End connects one end of feedback resistance, the outfan of the other end concatenation operation amplifier of feedback resistance, the input of operational amplifier
End is also connected with one end of the second slide rheostat, and the other end of the second slide rheostat connects one end of the first electric capacity, the first electricity
The outfan of the other end concatenation operation amplifier holding, the input of operational amplifier is also connected with one end of the second electric capacity, and second
The outfan of the other end concatenation operation amplifier of electric capacity.
Described signal conditioning circuit is used for converting analog signals into fully differential input signal, including the first operation amplifier
Device, the second operational amplifier, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance, first
The negative input end of operational amplifier connects one end of 3rd resistor, and the other end of 3rd resistor is grounded, the first operational amplifier
Positive input terminal connects one end of the 4th resistance, and the negative input end of the first operational amplifier is also connected with one end of first resistor, and first
The other end of resistance connects the outfan of the first operational amplifier, and the positive input terminal of the first operational amplifier is also connected with second resistance
One end, the other end of second resistance connects the outfan of the second operational amplifier, the negative input end of the second operational amplifier with
Outfan short circuit, the outfan of the first operational amplifier connects one end of the 5th resistance, and the other end of the 5th resistance connects a/d and turns
Change the input of control circuit, the outfan of the second operational amplifier is also connected with one end of the 6th resistance, the 6th resistance another
End connects the input of a/d conversion control circuit, and the positive input terminal of the second operational amplifier connects the defeated of a/d conversion control circuit
Enter end.
Described a/d conversion control circuit includes two a/d conversion chips, and two a/d conversion chip cascades.
Using the Winding in Power Transformer diagnostic method of the Winding in Power Transformer on-Line Monitor Device of Multi-information acquisition, wrap
Include following steps:
Step 1: the three-phase that voltage sensor gathers power transformer by the voltage transformer secondary side of transformer station is once
Side voltage signal and three-phase secondary side voltage signal, current sensor gathers electric power by the Current Transformer Secondary side of transformer station
The three-phase primary side current signal of transformator, vibrating sensor gathers the three-phase mechanical vibration signal of power transformer.
Step 2: phase shift amplifying circuit is by each phase primary side voltage signal of power transformer, each phase secondary side voltage signal
Decoupled and Filtering Processing with each phase primary side current signal and power transformer tank each mechanical kilowatt vibration signal.
Step 3: signal conditioning circuit will decouple and each phase primary side voltage signal after Filtering Processing, each phase secondary side electricity
Pressure signal, each phase primary side current signal and each mechanical kilowatt vibration signal carry out amplitude limiting processing so as to meet a/d conversion and control electricity
The input range on road.
Step 4:a/d conversion control circuit is by each phase primary side voltage signal after amplitude limiting processing, each phase secondary side voltage
Signal, each phase primary side current signal and each mechanical kilowatt vibration signal carry out analog digital conversion, obtain each phase primary side voltage digital
Signal, each phase secondary side voltage digital signal, each phase primary side current digital signal and each mechanical kilowatt vibration digital signal.
Step 5:dsp adopts short-circuit reactance method and mechanical vibration method to each phase primary side voltage digital signal, respectively mutually secondary
Side voltage digital signal, each phase primary side current digital signal and each mechanical kilowatt vibration digital signal are processed, and electric power is become
The each phase winding of depressor carries out mechanical vibration fault diagnosis.
Step 5.1: calculate phasor, phase angle and virtual value, each phase secondary side of each phase primary side voltage digital signal respectively
Voltage digital signal phasor, phase angle and virtual value, each phase primary side current digital signal phasor, phase angle and virtual value.
Step 5.2: each mechanical kilowatt vibration digital signal is decomposed by fft and carries out frequency domain character extraction, obtain each camera
The fundamental frequency amplitude of tool vibration signal, using the fundamental frequency amplitude of each mechanical kilowatt vibration signal as each phase winding of power transformer machinery
Vibration performance value.
Step 5.3: set up the online short-circuit reactance model of power transformer, by each phase primary side voltage digital signal, respectively
Phase secondary side voltage digital signal and each primary side current digital signal are as the online short-circuit reactance model of power transformer
Input, calculates the short-circuit reactance of each phase winding of power transformer, using the short-circuit reactance of each for power transformer phase winding as electricity
The electric characteristic value of each phase winding of power transformator.
Step 5.4: the short-circuit reactance of the calculating each phase winding of power transformer each phase with the trouble-free power transformer of history
The reactance change rate of the short-circuit reactance of winding.
Step 5.5: set the upper limit threshold of reactance change rate and the lower threshold of reactance change rate, if the electric power obtaining becomes
The reactance change rate of depressor winding is more than reactance change rate upper limit threshold, then judge that this phase winding of power transformer has machinery
Vibration fault, execution step 6, if the reactance change rate of the Winding in Power Transformer obtaining be more than reactance change rate lower threshold and
Less than reactance change rate upper limit threshold, then execution step 5.6, if the reactance change rate of the Winding in Power Transformer obtaining is less than electricity
Resistance rate lower threshold, then judge that this phase winding of power transformer is normal, execution step 6.
Step 5.6: by the fundamental frequency of mechanical oscillation signal corresponding for each phase current virtual value of Winding in Power Transformer
Amplitude is fitted, by the fundamental frequency amplitude fitting result of mechanical oscillation signal corresponding for each phase current virtual value obtaining with
The fundamental frequency amplitude of the corresponding mechanical oscillation signal of this phase current virtual value of the trouble-free Winding in Power Transformer of history is intended
Close result to be mated, the error judging matching result presence, whether in error allowed band, if so, then judges power transformer
This phase winding of device is normal, otherwise, then judges that this phase winding of power transformer has mechanical vibration fault.
The result of determination of each phase winding of power transformer is shown by step 6:mcu by display screen, result of determination
Including: winding is normal, a phase winding mechanical vibration fault, b phase winding mechanical vibration fault, c phase winding mechanical vibration fault and three
Phase winding mechanical vibration fault.
The invention has the beneficial effects as follows: the present invention establishes the Winding in Power Transformer on-line monitoring dress of Multi-information acquisition
Put, gather each phase winding electric current, each phase winding voltage and each phase winding mechanical vibration parameter integrated information, and by transformator around
Organize normal and fault different conditions attribute testing, set up the double information of transformer winding state based on reactance signal and vibration signal
Combination harvester；The online short-circuit reactance method by the further explication of error analyses to electric current, voltage sensor
Fft algorithm is applied in winding mechanical vibration method extract fundamental vibration change simultaneously, improves further by reactance change threshold value
The intelligent and accuracy of Transformer Winding diagnostic method；The Winding in Power Transformer that electrical characteristic and mechanical property blend exists
Line multi information method for diagnosing status, short-circuit reactance method and mechanical vibration method are combined, and to solve current transformer winding fault
Diagnosis exist diagnostic signal unification and cannot real time on-line monitoring winding operation conditions the problems such as.
Brief description
Fig. 1 is the structure chart of the Winding in Power Transformer on-Line Monitor Device of Multi-information acquisition in present embodiment；
Fig. 2 is phase shift amplifying circuit in the Winding in Power Transformer on-Line Monitor Device of Multi-information acquisition in present embodiment
Circuit diagram；
Fig. 3 is signal condition electricity in the Winding in Power Transformer on-Line Monitor Device of Multi-information acquisition in present embodiment
The circuit connection diagram on road, a/d conversion control circuit and dsp；
Fig. 4 be present embodiment in Multi-information acquisition Winding in Power Transformer on-Line Monitor Device in dsp, twoport ram,
The circuit connection diagram of mcu and oled liquid crystal display circuit；
Fig. 5 is the flow chart of the Winding in Power Transformer diagnostic method of Multi-information acquisition in present embodiment；
Fig. 6 is transformator equivalent electric in the Winding in Power Transformer on-Line Monitor Device of Multi-information acquisition in present embodiment
Road model.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the invention is described in detail.
The Winding in Power Transformer on-Line Monitor Device of Multi-information acquisition, as shown in figure 1, include voltage sensor, electric current
Sensor, vibration acceleration sensor, phase shift amplifying circuit, signal conditioning circuit, a/d conversion control circuit, dsp, twoport ram
And mcu.
The outfan of the outfan of voltage sensor, the outfan of current sensor and vibration acceleration sensor connects respectively
Connect the input of phase shift amplifying circuit, the outfan of phase shift amplifying circuit connects the input of signal conditioning circuit, signal condition
The outfan of circuit connects the input of a/d conversion control circuit, and the outfan of a/d conversion control circuit connects the input of dsp
End, dsp and mcu is attached by twoport ram.
Current sensor and voltage sensor connect the Current Transformer Secondary side of transformer station, voltage transformer secondary respectively
Side.
In present embodiment, from the current sensor of model sct254fk, from the model of Xing Ge company
The voltage sensor of spt204a.
Vibration acceleration sensor is installed on the correspondence position in fuel tank sidewall for the power transformer three-phase windings.
In present embodiment, from the vibration acceleration sensor of Lanace company model lc0154.
As shown in Fig. 2 phase shift amplifying circuit is used for being decoupled and Filtering Processing the signal of collection, including operation amplifier
Device, the first electric capacity c1, the second electric capacity c2, the 3rd electric capacity c3, feedback resistance r, the first slide rheostat r and the second slide rheostat
R ', the diode of input two reversal connections of parallel connection of operational amplifier, the outfan of operational amplifier connects the 3rd electric capacity c3's
One end, the 3rd electric capacity c3Other end ground connection, the input of operational amplifier is also connected with one end of the first slide rheostat r, the
The other end of one slide rheostat r connects one end of feedback resistance r, the other end concatenation operation amplifier of feedback resistance r defeated
Go out end, the input of operational amplifier is also connected with one end of the second slide rheostat r ', the other end of the second slide rheostat r '
Connect the first electric capacity c1One end, the first electric capacity c1Other end concatenation operation amplifier outfan, the input of operational amplifier
End is also connected with the second electric capacity c2One end, the second electric capacity c2Other end concatenation operation amplifier outfan.Electric capacity c2And c3Choosing
With the small capacitances of 400 to 1000pf, for decoupling and filtering.Operational amplifier precision uses op07 series, can be easier to reach
Arrive higher precision and preferable stability.
As shown in figure 3, signal conditioning circuit is used for converting analog signals into fully differential input signal, including the first computing
Amplifier, the second operational amplifier, first resistor r1, second resistance r2, 3rd resistor r3, the 4th resistance r4, the 5th resistance r5With
6th resistance r6, negative input end connection 3rd resistor r of the first operational amplifier3One end, 3rd resistor r3Another termination
Ground, the positive input terminal of the first operational amplifier connects the 4th resistance r4One end, the 4th resistance r4The other end connect bipolarity defeated
Enter end, the negative input end of the first operational amplifier is also connected with first resistor r1One end, first resistor r1The other end connect first
The outfan of operational amplifier, the positive input terminal of the first operational amplifier is also connected with second resistance r2One end, second resistance r2's
The other end connects the outfan of the second operational amplifier, the negative input end of the second operational amplifier and outfan short circuit, the first fortune
The outfan calculating amplifier connects the 5th resistance r5One end, the 5th resistance r5The other end connect a/d conversion control circuit+
In end, the outfan of the second operational amplifier is also connected with the 6th resistance r6One end, the 6th resistance r6The other end connect a/d turn
Change-in the end of control circuit, the positive input terminal of the second operational amplifier connects the+15v voltage end of a/d conversion control circuit.
Selected 3rd resistor r3For 4k ω, the 4th resistance r4For 20k ω, the 5th resistance r5For 1.2k ω, the 6th resistance
r6For 1.2k ω.
First operational amplifier of signal conditioning circuit and the second operational amplifier adopt operation amplifier chip opa227, and
By resistance r1、r2Bipolarity input range is made to be ± 2.5v, ± 5v, between ± 10v.
r1For 1k ω, r2During for 5k ω, bipolarity inputs as ± 10v, r1For 2k ω, r2During for 10k ω, bipolarity inputs
For ± 5v, r1For 4k ω, r2During for 20k ω, bipolarity inputs as ± 2.5v.
A/d conversion control circuit includes two a/d conversion chips, and two a/d conversion chip cascades, and the a/d of selection turns
Change model ads8365 of chip.
The data read-out mode of ads8365 mainly includes direct address read mode, circulation read mode, fifo read mode three
Kind, select direct address read mode in present embodiment.
Every ads8365 chip can realize the synchronous acquisition of six road signals, and two panels ads8365 can achieve 12 road signals
Synchronous acquisition, realize the function of analog to digital conversion circuit.
Model tms320f28335 of dsp.
A0, a1, a2, cs, rd, eoc, clk end of ads8365 connect respectively the xa0 of tms320f28335, xa1, xa2,
Cs, re, xint1, rwm5 end, d0～d15 end of ads8365 connects d0～d15 end of tms320f28335, ads8365's
Byte and add end is grounded.
Tms320f28335dsp passes through to control a2, and the level of a1, a0 port is 00l, and 010～101, to control and to turn
Change passage cha0, cha1～chc1.When an eoc signal can be produced after clematis stem track data EOC to notify dsp Change-over knot
Bundle, read signal rd is set low after this signal is detected by dsp, thus the signal after conversion is read in dsp successively, completes one group of number
According to analog digital conversion.
As shown in figure 4, the circuit connection diagram of dsp, twoport ram, mcu and oled liquid crystal display circuit,
R/w, ds, rd, ready end of tms320f28335dsp connects r/w, ce of twoport ram respectivelyl、oel、busylEnd,
D0～the d7 of tms320f28335dsp connects the d0～d7 of twoport raml, a0～a10 connection twoport of tms320f28335dsp
A0～the a10 of raml, the r/w of twoport ramr、cer、oer、busyrEnd connects wr, ale, rd, rdy end of mcu respectively,
D0～the d7 of tms320f28335dsprEnd connects pb0～pb7 end of twoport ram, tms320f28335dsp and twoport ram's
Need during connection to carry out bus extension to single-chip microcomputer, using the latch function of latch, by enabling control, divided using i/o mouth
The mode of Shi Fuyong is realizing the read-write of address data, the a0～a7 of tms320f28335dsprEnd is connected double by latch
Pb0～the pb7, the a8～a10 of tms320f28335dsp of mouth ramrEnd connects pb8～pb10 end of twoport ram.
When dsp and mcu carries out data exchange, produce conflict for avoiding carrying out write operation to same address, will in design
Cy7c026 address space is divided into two regions, is respectively allocated to dsp and single-chip microcomputer uses, the two can only distribute to oneself
Carry out write operation in space, carry out read operation in other side region, conflict thus can be avoided to produce, improve data exchange
Reliability.
In present embodiment, from oled liquid crystal display as human-computer interaction interface, from integrated ssd1305 oled
The vgy12864c display module of driver, is improved the display capabilities on the spot of monitoring system, also extends using oled display module
Its applied environment scope.Mcu can show by connecting oled liquid crystal display, pc8, pc9, pc10 end of mcu is respectively
Connect dc, wr, rd end of oled, pc0～pc7 end of mcu connects db0～db7 end of oled, the pc1l end of mcu connects oled
Cs end, the pc12 end of mcu connects the rst end of oled.
In present embodiment, the chip from technical grade and element, using reasonable pcb layout and manufacturing process, to cut off
The interference of various electromagnetic coupled, ensures the height reliability of whole system as far as possible, takes following measures:
(1) isolation and shielding measure.Input, output circuit are effectively isolated by photo-coupler.Secondary circuit connects up
When by strong, weak electricity holding wire separately, realize isolation, it is to avoid mutual induction and mutual interference impact between loop, the cloth of printed circuit board (PCB)
Holding wire and power line are separated by line, digital circuit and analog circuit separate, and play good circuit isolation effect.
(2) process of power circuit.Between power supply positive and negative electrode and connect jumbo electric capacity, and all plug-in units and chip
There is decoupling capacitance between power supply and ground, zero-power line takes the mode of floating, can reduce between power line and casing as far as possible
Distribution capacity, it is to avoid interference.
Using the Winding in Power Transformer diagnostic method of the Winding in Power Transformer on-Line Monitor Device of Multi-information acquisition, such as
Shown in Fig. 5, comprise the following steps:
Step 1: the three-phase that voltage sensor gathers power transformer by the voltage transformer secondary side of transformer station is once
Side voltage signal and three-phase secondary side voltage signal, current sensor gathers electric power by the Current Transformer Secondary side of transformer station
The three-phase primary side current signal of transformator, vibrating sensor gathers the three-phase mechanical vibration signal of power transformer.
Step 2: phase shift amplifying circuit is by each phase primary side voltage signal of power transformer, each phase secondary side voltage signal
Decoupled and Filtering Processing with each phase primary side current signal and power transformer tank each mechanical kilowatt vibration signal.
Step 3: signal conditioning circuit will decouple and each phase primary side voltage signal after Filtering Processing, each phase secondary side electricity
Pressure signal, each phase primary side current signal and each mechanical kilowatt vibration signal carry out amplitude limiting processing so as to meet a/d conversion and control electricity
The input range on road.
Step 4:a/d conversion control circuit is by each phase primary side voltage signal after amplitude limiting processing, each phase secondary side voltage
Signal, each phase primary side current signal and each mechanical kilowatt vibration signal carry out analog digital conversion, obtain each phase primary side voltage digital
Signal, each phase secondary side voltage digital signal, each phase primary side current digital signal and each mechanical kilowatt vibration digital signal.
Step 5:dsp adopts short-circuit reactance method and mechanical vibration method to each phase primary side voltage digital signal, respectively mutually secondary
Side voltage digital signal, each phase primary side current digital signal and each mechanical kilowatt vibration digital signal are processed, and electric power is become
The each phase winding of depressor carries out mechanical vibration fault diagnosis.
Step 5.1: calculate phasor, phase angle and virtual value, each phase secondary side of each phase primary side voltage digital signal respectively
Voltage digital signal phasor, phase angle and virtual value, each phase primary side current digital signal phasor, phase angle and virtual value.
Step 5.2: each mechanical kilowatt vibration digital signal is decomposed by fft and carries out frequency domain character extraction, obtain each camera
The fundamental frequency amplitude of tool vibration signal, using the fundamental frequency amplitude of each mechanical kilowatt vibration signal as each phase winding of power transformer machinery
Vibration performance value.
Step 5.3: set up the online short-circuit reactance model of power transformer, by each phase primary side voltage digital signal, respectively
Phase secondary side voltage digital signal and each primary side current digital signal are as the online short-circuit reactance model of power transformer
Input, calculates the short-circuit reactance of each phase winding of power transformer, using the short-circuit reactance of each for power transformer phase winding as electricity
The electric characteristic value of each phase winding of power transformator.
Equivalent circuit of transformer transformator as shown in Figure 6, Transformer Short Circuit Impedance is when load impedance is zero
The equiva lent impedance of inside transformer.The reactive component of short-circuit impedance, that is, short-circuit reactance is it is simply that the leakage reactance of winding.Short-circuit reactance
Relevant with the relative position of winding and physical dimension, by monitoring the short-circuit reactance of transformator come the deformation of detection winding.
When transformator occurs coil displacements or turn-to-turn short circuit, will there is strong change in stray field.The change of stray field directly affects
To the change of winding leakage inductance, that is, affect the change of leakage reactance, and then short-circuit reactance value also just changes.In figureFor transformator
Primary side voltage；For Circuit Fault on Secondary Transformer voltage；For Circuit Fault on Secondary Transformer voltage primary side reduced value；For becoming
Depressor primary side current；For Circuit Fault on Secondary Transformer electric current；For Circuit Fault on Secondary Transformer electric current primary side reduced value；For
Transformer excitation electric current (or no-load current)；z1、r1、x1It is the impedance of transformator first side winding, resistance, reactance respectively；z2、
r2、x2It is the impedance of Circuit Fault on Secondary Transformer winding, resistance, reactance respectively；z2′、r2、x2' it is Circuit Fault on Secondary Transformer winding respectively
Impedance, resistance, reactance primary side reduced value；z10、r10、x10It is respectively exciting impedance, resistance, reactance, z1=r1+jx1, z2
=r2+jx2, z10=r10+jx10, z2'=r2′+jx2′.
ByThe short-circuit reactance of each phase winding of transformator is obtained after derivation
Shown in computing formula such as formula (1):
Wherein, k is transformer voltage ratio, xkFor transformer short-circuit reactance, φ1For the phase angle of transformator primary side voltage, φ2
For the phase angle of Circuit Fault on Secondary Transformer voltage, φ3For the phase angle of transformator primary side current, u1For having of transformator primary side voltage
Valid value, u2' for the reduced value in primary side for the Circuit Fault on Secondary Transformer voltage virtual value, i1Effective for transformator primary side current
Value.
Step 5.4: the short-circuit reactance of the calculating each phase winding of power transformer each phase with the trouble-free power transformer of history
The reactance change rate of the short-circuit reactance of winding.
Step 5.5: set the upper limit threshold of reactance change rate and the lower threshold of reactance change rate, if the electric power obtaining becomes
The reactance change rate of depressor winding is more than reactance change rate upper limit threshold, then judge that this phase winding of power transformer has machinery
Vibration fault, execution step 6, if the reactance change rate of the Winding in Power Transformer obtaining be more than reactance change rate lower threshold and
Less than reactance change rate upper limit threshold, then execution step 5.6, if the reactance change rate of the Winding in Power Transformer obtaining is less than electricity
Resistance rate lower threshold, then judge that this phase winding of power transformer is normal, execution step 6.
In present embodiment, setting set the upper limit threshold of reactance change rate as 4%, the lower threshold of reactance change rate
For 2%.
Short-circuit reactance rate of change with reference to specified in GB is not to be exceeded 2%, in the case of there is sensor error,
In on-line monitoring short-circuit reactance method, transformator between 2%～4% for the reactance change rate, need to arouse attention, when short circuit electricity
It may be determined that there are mechanical faults inside Transformer Winding when resistance rate is more than 4%.
Step 5.6: by the fundamental frequency of mechanical oscillation signal corresponding for each phase current virtual value of Winding in Power Transformer
Amplitude is fitted, by the fundamental frequency amplitude fitting result of mechanical oscillation signal corresponding for each phase current virtual value obtaining with
The fundamental frequency amplitude of the corresponding mechanical oscillation signal of this phase current virtual value of the trouble-free Winding in Power Transformer of history is intended
Close result to be mated, the error judging matching result presence, whether in error allowed band, if so, then judges power transformer
This phase winding of device is normal, otherwise, then judges that this phase winding of power transformer has mechanical vibration fault.
The result of determination of each phase winding of transformator is shown by display screen, result of determination includes by step 6:mcu:
Winding is normal, a phase winding mechanical vibration fault, b phase winding mechanical vibration fault, c phase winding mechanical vibration fault and three-phase around
Group mechanical vibration fault.
Claims (1)
1. the Winding in Power Transformer diagnostic method of a kind of Multi-information acquisition, the Winding in Power Transformer using Multi-information acquisition exists
Line monitoring device, including voltage sensor, current sensor, vibration acceleration sensor, phase shift amplifying circuit, signal condition electricity
Road, a/d conversion control circuit, dsp, twoport ram and mcu；
The outfan of the outfan of voltage sensor, the outfan of current sensor and vibration acceleration sensor connects shifting respectively
The input of phase amplifying circuit, the outfan of phase shift amplifying circuit connects the input of signal conditioning circuit, signal conditioning circuit
Outfan connect the input of a/d conversion control circuit, the outfan of a/d conversion control circuit connects the input of dsp,
Dsp and mcu is attached by twoport ram；
Current sensor and voltage sensor connect the Current Transformer Secondary side of transformer station, voltage transformer secondary side respectively；
Vibration acceleration sensor is installed on the correspondence position in fuel tank sidewall for the power transformer three-phase windings；
It is characterized in that, comprise the following steps:
Step 1: voltage sensor gathers the three-phase primary side electricity of power transformer by the voltage transformer secondary side of transformer station
Pressure signal and three-phase secondary side voltage signal, current sensor gathers power transformer by the Current Transformer Secondary side of transformer station
The three-phase primary side current signal of device, vibrating sensor gathers the three-phase mechanical vibration signal of power transformer；
Step 2: phase shift amplifying circuit is by each phase primary side voltage signal of power transformer, each phase secondary side voltage signal and each
Phase primary side current signal and power transformer tank each mechanical kilowatt vibration signal are decoupled and Filtering Processing；
Step 3: signal conditioning circuit will decouple and each phase primary side voltage signal after Filtering Processing, each phase secondary side voltage letter
Number, each phase primary side current signal and each mechanical kilowatt vibration signal carry out amplitude limiting processing so as to meet a/d conversion control circuit
Input range；
Step 4:a/d conversion control circuit by each phase primary side voltage signal after amplitude limiting processing, each phase secondary side voltage signal,
Each phase primary side current signal and each mechanical kilowatt vibration signal carry out analog digital conversion, obtain each phase primary side voltage digital signal,
Each phase secondary side voltage digital signal, each phase primary side current digital signal and each mechanical kilowatt vibration digital signal；
Step 5:dsp adopts short-circuit reactance method and mechanical vibration method to each phase primary side voltage digital signal, each phase secondary side electricity
Pressure digital signal, each phase primary side current digital signal and each mechanical kilowatt vibration digital signal are processed, to power transformer
Each phase winding carries out mechanical vibration fault diagnosis；
Step 5.1: calculate phasor, phase angle and virtual value, each phase secondary side voltage of each phase primary side voltage digital signal respectively
Digital signal phasor, phase angle and virtual value, each phase primary side current digital signal phasor, phase angle and virtual value；
Step 5.2: each mechanical kilowatt vibration digital signal is decomposed by fft and carries out frequency domain character extraction, obtain each mechanical kilowatt and shake
The fundamental frequency amplitude of dynamic signal, using the fundamental frequency amplitude of each mechanical kilowatt vibration signal as each phase winding of power transformer mechanical vibration
Eigenvalue；
Step 5.3: set up the online short-circuit reactance model of power transformer, by each phase primary side voltage digital signal, each phase two
Secondary side voltage digital signal and each primary side current digital signal as the input of the online short-circuit reactance model of power transformer,
Calculate the short-circuit reactance of each phase winding of power transformer, using the short-circuit reactance of each for power transformer phase winding as power transformer
The electric characteristic value of each phase winding of device；
Step 5.4: calculate short-circuit reactance and each phase winding of the trouble-free power transformer of history of each phase winding of power transformer
Short-circuit reactance reactance change rate；
Step 5.5: set the upper limit threshold of reactance change rate and the lower threshold of reactance change rate, if the power transformer obtaining
The reactance change rate of winding is more than reactance change rate upper limit threshold, then judge that this phase winding of power transformer has mechanical vibration
Fault, execution step 6, if the reactance change rate of the Winding in Power Transformer obtaining is more than reactance change rate lower threshold and is less than
Reactance change rate upper limit threshold, then execution step 5.6, if the reactance change rate of the Winding in Power Transformer obtaining is less than reactance and becomes
Rate lower threshold, then judge that this phase winding of power transformer is normal, execution step 6；
Step 5.6: by the fundamental frequency amplitude of mechanical oscillation signal corresponding for each phase current virtual value of Winding in Power Transformer
It is fitted, by the fundamental frequency amplitude fitting result of mechanical oscillation signal corresponding for each phase current virtual value obtaining and history
The fundamental frequency amplitude matching knot of the corresponding mechanical oscillation signal of this phase current virtual value of trouble-free Winding in Power Transformer
Fruit is mated, and the error judging matching result presence, whether in error allowed band, if so, then judges power transformer
This phase winding is normal, otherwise, then judges that this phase winding of power transformer has mechanical vibration fault；
The result of determination of each phase winding of power transformer is shown by display screen, result of determination includes by step 6:mcu:
Winding is normal, a phase winding mechanical vibration fault, b phase winding mechanical vibration fault, c phase winding mechanical vibration fault and three-phase around
Group mechanical vibration fault.
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