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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
phase
signal
power transformer
winding
voltage
Prior art date
Application number
CN201410526010.9A
Other languages
Chinese (zh)
Other versions
CN104237705A (en
Inventor
张彬
徐建源
林莘
王奕飞
Original Assignee
沈阳工业大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 沈阳工业大学 filed Critical 沈阳工业大学
Priority to CN201410526010.9A priority Critical patent/CN104237705B/en
Publication of CN104237705A publication Critical patent/CN104237705A/en
Application granted granted Critical
Publication of CN104237705B publication Critical patent/CN104237705B/en

Links

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

The diagnostic method of the Winding in Power Transformer on-Line Monitor Device of Multi-information acquisition
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):
u 1 ( cosφ 1 · sinφ 3 - sinφ 1 · cosφ 3 ) - i 1 - u 2 ′ ( cosφ 2 · sinφ 3 - sinφ 2 · cosφ 3 ) - i 1 = x k - - - ( 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.
CN201410526010.9A 2014-09-30 2014-09-30 Diagnostic method of multi-information fusion online monitoring device for windings of power transformers CN104237705B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410526010.9A CN104237705B (en) 2014-09-30 2014-09-30 Diagnostic method of multi-information fusion online monitoring device for windings of power transformers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410526010.9A CN104237705B (en) 2014-09-30 2014-09-30 Diagnostic method of multi-information fusion online monitoring device for windings of power transformers

Publications (2)

Publication Number Publication Date
CN104237705A CN104237705A (en) 2014-12-24
CN104237705B true CN104237705B (en) 2017-01-25

Family

ID=52226178

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410526010.9A CN104237705B (en) 2014-09-30 2014-09-30 Diagnostic method of multi-information fusion online monitoring device for windings of power transformers

Country Status (1)

Country Link
CN (1) CN104237705B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109612565A (en) * 2018-12-29 2019-04-12 国网上海市电力公司 A kind of outdoor installs case cabinet of transformer winding state vibration monitoring
CN109612564A (en) * 2018-12-29 2019-04-12 国网上海市电力公司 Transformer winding state vibration monitoring device in a kind of short-circuit test

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105277355B (en) * 2015-11-20 2017-12-29 华北电力大学 A kind of power transformer pressing plate fault detection method based on decompression release capsule
CN105823951A (en) * 2016-06-08 2016-08-03 国网辽宁省电力有限公司电力科学研究院 Pressing force characteristic diagnostic system of power transformer winding
CN106501608B (en) * 2016-10-14 2019-02-22 国网福建省电力有限公司 Error compensation and harmonic elimination device during a kind of reactance measurement
CN106643877A (en) * 2016-11-18 2017-05-10 西安亚能电气有限责任公司 Multi-sensing information fusion-based power transformer on-line monitoring system and method
CN106707890A (en) * 2017-02-17 2017-05-24 巴音郭楞职业技术学院 Power transformer fault diagnosis system based on Internet of Things
CN106908688B (en) * 2017-03-24 2020-04-17 广东电网有限责任公司电力科学研究院 Portable power transformer winding fault real-time diagnosis equipment
CN110082585A (en) * 2018-01-25 2019-08-02 天津安消科技有限公司 AC three-phase pressure sensor and its system
CN108565980B (en) * 2018-05-13 2021-02-05 江苏亨特集团华特电气有限公司 Collection power supply unit towards transformer fault monitoring device
CN108802553A (en) * 2018-06-12 2018-11-13 广州供电局有限公司 A kind of transformer winding fault state system of condition monitoring
CN109342876A (en) * 2018-07-31 2019-02-15 国网江苏省电力有限公司徐州供电分公司 A kind of transformer winding machine performance diagnostic system and its diagnostic method based on many kinds of parameters acquisition
CN110927628B (en) * 2018-08-31 2021-04-06 株洲中车时代电气股份有限公司 Locomotive traction transformer secondary winding short circuit diagnosis method and device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5034681A (en) * 1989-02-13 1991-07-23 Westinghouse Brake And Signal Holdings Limited Voltage detection
JPH09229981A (en) * 1996-02-21 1997-09-05 Hitachi Ltd Monitoring device used for monitoring harmonics and harmonic monitoring system
CN101261297A (en) * 2008-04-17 2008-09-10 沈阳工业大学 Electric power transformer windings parameter on-line real-time identification device and method
CN202351347U (en) * 2011-11-17 2012-07-25 南京因泰莱配电自动化设备有限公司 Monitoring terminal device for distribution transformer
CN203502046U (en) * 2013-08-30 2014-03-26 国家电网公司 Power transformer on-line state monitoring system base on vibration method
CN204129139U (en) * 2014-09-30 2015-01-28 沈阳工业大学 The Winding in Power Transformer on-Line Monitor Device of Multi-information acquisition

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5034681A (en) * 1989-02-13 1991-07-23 Westinghouse Brake And Signal Holdings Limited Voltage detection
JPH09229981A (en) * 1996-02-21 1997-09-05 Hitachi Ltd Monitoring device used for monitoring harmonics and harmonic monitoring system
CN101261297A (en) * 2008-04-17 2008-09-10 沈阳工业大学 Electric power transformer windings parameter on-line real-time identification device and method
CN202351347U (en) * 2011-11-17 2012-07-25 南京因泰莱配电自动化设备有限公司 Monitoring terminal device for distribution transformer
CN203502046U (en) * 2013-08-30 2014-03-26 国家电网公司 Power transformer on-line state monitoring system base on vibration method
CN204129139U (en) * 2014-09-30 2015-01-28 沈阳工业大学 The Winding in Power Transformer on-Line Monitor Device of Multi-information acquisition

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
变压器绕组状态监测与故障诊断系统设计;刘洋;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》;20130715(第07期);正文第24-37页 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109612565A (en) * 2018-12-29 2019-04-12 国网上海市电力公司 A kind of outdoor installs case cabinet of transformer winding state vibration monitoring
CN109612564A (en) * 2018-12-29 2019-04-12 国网上海市电力公司 Transformer winding state vibration monitoring device in a kind of short-circuit test

Also Published As

Publication number Publication date
CN104237705A (en) 2014-12-24

Similar Documents

Publication Publication Date Title
CN103675605B (en) A kind of power distribution network earth fault line selection method based on the correlation analysis of fault-signal transient state
CN103698695B (en) The method of testing that a kind of multifunctional high pressure breaker electrical characteristic test device is performed
CN203054162U (en) Comprehensive tester for partial discharge of high-voltage cable
CN101777759B (en) Complete set of protection devices for ultrahigh-speed DC line on basis of single-ended transient signals and protection method thereof
CN104049171B (en) Open-circuit fault diagnosis method for staggered flyback type micro inverter
CN102135558B (en) Acquisition and hierarchical identification system of overvoltage data and hierarchical pattern identification method of overvoltage types
CN102508076B (en) Fault diagnosis device and method based on multi-agent system and wavelet analysis
CN103529321B (en) CT saturation detection method
CN201477189U (en) Device for online detecting mechanical characteristics of 24 kV high-voltage vacuum circuit breaker
CN102998545B (en) Online transformer winding work state monitoring method
CN103713217B (en) The on-line monitoring method of Operation Condition of Power Transformers under a kind of Direct Current Bias
CN104569481B (en) Buchholz relay oil stream flow velocity acquisition system and grave gas setting valve method of calibration
CN102735969B (en) Power transformer winding fault simulation test method
US10338127B2 (en) Method and system for identifying full parameters of element by fault recording and fault locating method
CN101943719B (en) Shared-frequency asynchronous phase-checking method
CN104111393B (en) Comprehensive evaluation analysis method for power transformer short-circuiting resistance
CN102624027B (en) Multiprocess island effect detection device and method
WO2015074473A1 (en) Grounding grid breakpoint diagnostic method for transient electromagnetic method
CN106093591B (en) A kind of isolated neutral capacitance current of distribution network measuring system and method
CN103257306B (en) Method for diagnosing direct current partial discharging insulation state of converter transformer and measurement system
CN203965613U (en) A kind of emulation test system of earth-fault indicator performance
CN107451557A (en) Transmission line short-circuit fault diagnostic method based on experience wavelet transformation and local energy
US20140216157A1 (en) Method for Determining Arc Discharge as well as Failure of Mechanical Vibration and Abnormal Displacement in Power Equipment Using Acoustic Energy Feature
CN107064734A (en) A kind of flexible direct current Fault Location for Distribution Network method of utilization fault transient process
CN102721465B (en) System and method for diagnosing and preliminarily positioning loosening faults of iron core of power transformer

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model