CN206114823U - Power transformer winding trouble on -line monitoring device - Google Patents
Power transformer winding trouble on -line monitoring device Download PDFInfo
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- CN206114823U CN206114823U CN201621118104.3U CN201621118104U CN206114823U CN 206114823 U CN206114823 U CN 206114823U CN 201621118104 U CN201621118104 U CN 201621118104U CN 206114823 U CN206114823 U CN 206114823U
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Abstract
The utility model provides a power transformer winding trouble on -line monitoring device, belongs to power transformer fault diagnosis technical field. The utility model discloses a hyperfrequency sensor, voltage sensor, current sensor, synchronization signal sampling circuit, signal conditioning circuit, AD converting circuit, DSP, CPLD, USB, PC and audio alert ware, synchronization signal sampling circuit's input is connected to voltage sensor and current sensor's output, signal conditioning circuit's input is connected to the output of synchronization signal sampling circuit and hyperfrequency sensor, AD converting circuit's input is connected to signal conditioning circuit's output, DSP's input is connected to AD converting circuit's output, DSP's output is connected with CPLD's input, CPLD's output and PC are connected through USB, the PC is connected with the audio alert ware. The utility model discloses a monitor in the time of transformer multiple fault information, improved the sampling precision greatly.
Description
Technical field
The utility model belongs to diagnosing fault of power transformer technical field, more particularly to a kind of Winding in Power Transformer
On-line Fault monitoring device.
Background technology
Used as one of most important hinge of power system, its safe and reliable operation is directly connected to generating to power transformer
And the security and the reliability of electric power system, therefore, the fault detect, maintenance and maintenance to transformer is to ensure that electric power system is normal
The important process of operation.In various power equipments, the winding of power transformer is the part for causing Power Transformer Faults more
One of, and the structure and electromagnetic environment of transformer are particularly complicated, and its office puts monitoring problem and seems and also more project, therefore, it is deep
Enter to study detection and the diagnostic method of transformer fault, to improving transformer production level, it is ensured that electric power netting safe running has product
The meaning of pole.
Power transformer in running, the change of the change direct reaction Winding in Power Transformer of short-circuit reactance, i.e.,
Can just predict the degree of winding deformation by monitoring the change of the short-circuit reactance value of power transformer on-line, so as to avoid around
Transformer mechanical breakdown caused by group deformation.The partial discharge monitoring method for using at present also has a lot, such as using super
Sonic detection positioning mode on-line monitoring Partial Discharge in Power Transformer positioning is put, and the method has certain limitation：Work as discharge source
Positioned at Transformer Winding top layer when test be it is effective, when discharge source be located at transformer insulated depths when, signal will be difficult to receive；
For the multiple spot electric discharge for occurring simultaneously, the size of ultrasonic signal how is judged, how to distinguish its ultrasonic signal, it is still necessary to do into one
The work of step；Additionally, the degree of accuracy in the scene positioning with strong electromagnetic of this method is not high.Its reason mainly has：Transformer
Built-in electrical insulation complex structure, decay of the various acoustic mediums to sound wave and the impact to the velocity of sound it is all different.The local for using at present
Electric discharge monitoring ultrasonic sensor anti-electromagnetic interference capability is poor, and sensitivity is also not bery high；Algorithm in various calculating positioning modes
Also it is perfect not to the utmost.
Utility model content
For the problem that prior art is present, the utility model provides a kind of Winding in Power Transformer On-line Fault monitoring dress
Put, it is monitored while realizing transformer multiple faults information, substantially increases sampling precision.
To achieve these goals, the utility model is adopted the following technical scheme that：A kind of Winding in Power Transformer failure exists
Line monitoring device, including uhf sensor, voltage sensor, current sensor, synchronizing signal sample circuit, signal condition electricity
Road, A/D change-over circuits, DSP, CPLD, USB, PC and phonetic alarm；The output end of voltage sensor and current sensor connects
Connect the output end connection signal condition of the input of synchronizing signal sample circuit, synchronizing signal sample circuit and uhf sensor
The input of circuit, the output end of signal conditioning circuit connects the input of A/D change-over circuits, the output end of A/D change-over circuits
The input of connection DSP, the output end of DSP is connected with the input of CPLD, and the output end of CPLD is connected with PC by USB
Connect, PC is connected with phonetic alarm.
The synchronizing signal sample circuit includes the first operational amplifier, the second operational amplifier, first resistor, second electric
Resistance, 3rd resistor, the 4th resistance, the 5th resistance, the first electric capacity, the second electric capacity and the 3rd electric capacity, the first operational amplifier it is negative
Input is connected with its output end, and positive input terminal is connected with one end of first resistor, the first electric capacity, the first electric capacity it is another
End ground connection, the other end of first resistor is the input of synchronizing signal sample circuit；The output end connection of the first operational amplifier
One end of second resistance, the other end of second resistance connects the second electric capacity, one end of the 4th resistance and the second operational amplifier
Positive input terminal, the other end ground connection of the second electric capacity, the output end of the other end second operational amplifier of connection of the 4th resistance, second
The negative input end of operational amplifier connects one end of 3rd resistor, the other end ground connection of 3rd resistor；Second operational amplifier
Output end connects one end of the 5th resistance and the 3rd electric capacity, the other end connection power supply of the 5th resistance, the other end of the 3rd electric capacity
Ground connection, the output end of the second operational amplifier is the output end of synchronizing signal sample circuit.
The signal conditioning circuit include the 3rd operational amplifier, four-operational amplifier, the 6th resistance, the 7th resistance,
8th resistance, the 9th resistance, the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the first diode and second
Diode, the positive input terminal of the 3rd operational amplifier connects one end of the 7th resistance, the other end connection the one or two of the 7th resistance
The positive pole of pole pipe；The negative input end of the 3rd operational amplifier connects one end of the 6th resistance and the tenth resistance, the 6th resistance it is another
After one end is connected with one end of the 8th resistance, it is connected with signal input part Vi, the other end of the 8th resistance and the 4th computing
The negative input end of amplifier is connected；The other end of the tenth resistance and one end of the 12nd resistance and the 3rd operational amplifier it is defeated
Go out end to be connected, after the other end of the 12nd resistance is connected with the negative pole of the first diode, be connected with signal output part Vo2
Connect；The positive input terminal of four-operational amplifier is connected with one end of the 9th resistance and the 11st resistance, the 9th resistance it is another
End is connected and is grounded with the positive pole of the second diode, and the other end of the 11st resistance and one end of the 13rd resistance and the 4th are transported
The output end for calculating amplifier is connected, defeated with signal after the other end of the 13rd resistance is connected with the negative pole of the second diode
Go out and hold Vo1 to be connected.
Operation principle of the present utility model：
If on the one hand the utility model gathers the ultrasonic signal done on power transformer tank wall, by the ultrasonic wave
Signal is changed through signal condition, A/D, then Jing DSP carry out denoising, and shelf depreciation coordinate is finally calculated on PC,
Judge partial discharge position；On the other hand three-phase primary side, the voltage of secondary side, the current signal of power transformer are gathered, it is right
Signal is processed, and sets up the online short-circuit reactance model of power transformer, calculates the short circuit of each phase winding of power transformer
Reactance value, the trouble-free short-circuit reactance value of short-circuit reactance value and the history of calculating is compared, and draws short-circuit reactance rate of change,
Judge short-circuit reactance rate of change upper limit threshold values set in advance and lower limit threshold values what in the range of, and then judge transformer around
The working condition of group, realizes the on-line monitoring of Winding in Power Transformer failure.
Compared with immediate prior art, the beneficial effects of the utility model：
1st, the utility model is to Winding in Power Transformer On-line Fault while monitoring, using uhf sensor to becoming
The acoustic signals that depressor inside shelf depreciation is produced are acquired, and through signal processing analysis, draw shelf depreciation coordinate, then root
Judge the position of inside transformer insulation fault according to shelf depreciation coordinate, monitor while realizing transformer multiple faults information；
2nd, the utility model employs the synchronizing signal sample circuit of electric current and voltage, reduces system and transformer both sides
The phase error of electric current, voltage, substantially increases sampling precision；
3rd, A/D change-over circuits of the present utility model adopt AD7656 conversion chips, and AD7656 conversion chips are six passages
16-bit SAR ADCs, the similar ambipolar ADC of power dissipation ratio reduces 60%, the precision under every passage 250KS/s sample rates
It is 2 times of like product；The six analog input of AD7656 conversion chips is divided into three groups, and each input has a tracking to protect
Hold amplifier to realize sampling and translation function while passage, be especially suitable for the needs of multi pass acquisition system；
4th, the utility model adopts TMS320F2812 chips, this chip to have high property the dsp chip of Digital Signal Processing
Can, multi-functional, high performance-price ratio the characteristics of, and it adopts Harvard bus structures, with password protection mechanism, can carry out 16*16
The multiply-add and multiply-add operations of 32*32, thus the function with rapid computations；
5th, the utility model carries out denoising to acoustic signals using CEEMD Denoising Algorithms, what CEEMD was produced in suppressing to decompose
End effect aspect have more preferable effect, the error that end effect causes is reduced to a certain extent, reduce its for point
The impact of solution result, improves fineness and the degree of accuracy of reconstruction signal；
6th, usb bus of the present utility model have the high interface advantage of fast transmission speed, simple structure, reliability, use
Simple system can be caused in system, versatility is good, cost performance is high.
Description of the drawings
Fig. 1 is one embodiment connection figure in actual applications of monitoring device of the present utility model；
Fig. 2 be monitoring device of the present utility model one embodiment in power transformer three-phase three winding it is single-phase etc.
Effect model sketch；
Fig. 3 is the schematic block circuit diagram of Winding in Power Transformer On-line Fault monitoring device of the present utility model；
Fig. 4 is the circuit theory diagrams of the synchronizing signal sample circuit of one embodiment of monitoring device of the present utility model；
Fig. 5 is the circuit theory diagrams of the signal conditioning circuit of one embodiment of monitoring device of the present utility model；
Fig. 6 is the circuit connection diagram of the A/D change-over circuits with DSP of one embodiment of monitoring device of the present utility model；
Fig. 7 is the circuit connection of USB (CY7C68013) chip of one embodiment of monitoring device of the present utility model
Figure；
Fig. 8 is the DSP (TMS320F2812), CPLD and USB of one embodiment of monitoring device of the present utility model
(CY7C68013) circuit connection diagram；
Fig. 9 is the equivalent model figure of transformer；
Figure 10 is partial discharge monitoring Mathematical Modeling figure of the present utility model；
Figure 11 is the program flow diagram of diagnostic method of the present utility model.
Specific embodiment
Below in conjunction with the accompanying drawings the utility model is described in further detail with specific embodiment.
As shown in figure 3, a kind of Winding in Power Transformer On-line Fault monitoring device, including uhf sensor, voltage biography
Sensor, current sensor, synchronizing signal sample circuit, signal conditioning circuit, A/D change-over circuits, DSP, CPLD, USB, PC and
Phonetic alarm；The output end of voltage sensor and current sensor connects the input of synchronizing signal sample circuit, synchronous letter
The output end of number sample circuit and uhf sensor connects the input of signal conditioning circuit, the output end of signal conditioning circuit
The input of connection A/D change-over circuits, the output end of A/D change-over circuits connects the input of DSP, the output end and CPLD of DSP
Input be connected, the output end of CPLD is connected with PC by USB, and PC is connected with phonetic alarm.
In the present embodiment, the uhf sensor uses the piezoelectric type sonic sensor with magnet.
As shown in figure 4, the synchronizing signal sample circuit be used to being filtered the electric signal of collection, Zero-cross comparator and limit
Width process, it is made up of two parts, including the first operational amplifier A1, the second operational amplifier A2, first resistor R1, it is second electric
Resistance R2, 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the first electric capacity C1, the second electric capacity C2And the 3rd electric capacity C3, the first fortune
Calculate amplifier A1Negative input end be connected with its output end, positive input terminal and first resistor R1, the first electric capacity C1One end be connected
Connect, the first electric capacity C1The other end ground connection, first resistor R1The other end for synchronizing signal sample circuit input；First fortune
Calculate amplifier A1Output end connection second resistance R2One end, second resistance R2The other end connect the second electric capacity C2, it is the 4th electric
Resistance R4One end and the second operational amplifier A2Positive input terminal, the second electric capacity C2The other end ground connection, the 4th resistance R4It is another
The second operational amplifier A of end connection2Output end, the second operational amplifier A2Negative input end connection 3rd resistor R3One end,
3rd resistor R3The other end ground connection；Second operational amplifier A2Output end connect the 5th resistance R5With the 3rd electric capacity C3One
End, the 5th resistance R5The other end connection power supply, the 3rd electric capacity C3The other end ground connection, the second operational amplifier A2Output end
For the output end of synchronizing signal sample circuit.
In the present embodiment, resistance R1=R2=R3=1k Ω, R4=1M Ω, R5=10k Ω, electric capacity C1=C2=C3=0.1 μ
F, the first operational amplifier A1Using LM124, the second operational amplifier A2Using LM311.
As shown in figure 5, the signal conditioning circuit is that analog signal is carried out bipolar processes, it includes that the 3rd computing is put
Big device A3, four-operational amplifier A4, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10、
11st resistance R11, the 12nd resistance R12, the 13rd resistance R13, the first diode D1And the second diode D2；3rd computing is put
Big device A3Positive input terminal connect the 7th resistance R7One end, the 7th resistance R7The other end connect the first diode D1Positive pole；
3rd operational amplifier A3Negative input end connect the 6th resistance R6With the tenth resistance R10One end, the 6th resistance R6The other end
With the 8th resistance R8One end be connected after, be connected with signal input part Vi, the 8th resistance R8The other end put with the 4th computing
Big device A4Negative input end be connected；Tenth resistance R10The other end and the 12nd resistance R12One end and the 3rd operational amplifier
A3Output end be connected；12nd resistance R12The other end and the first diode D1Negative pole be connected after, with signal output
End Vo2 is connected；Four-operational amplifier A4Positive input terminal and the 9th resistance R9With the 11st resistance R11One end be connected,
9th resistance R9The other end and the second diode D2Positive pole be connected and be grounded, the 11st resistance R11The other end and the tenth
Three resistance R13One end and four-operational amplifier A4Output end be connected, the 13rd resistance R13The other end and the two or two pole
Pipe D2Negative pole be connected after, be connected with signal output part Vol.
In the present embodiment, resistance R6=R7=R8=R9=R11=R12=R13=1k Ω, R10=2k Ω；3rd operation amplifier
Device A3With four-operational amplifier A4Using operation amplifier chip 0PA227, the bipolarity input range of the circuit is ± 5V.
The A/D change-over circuits include three A/D conversion chips, and three A/D conversion chips cascades；From A/D turn
It is AD7656 to change chip model, and every AD7656 chip can realize the synchronous acquisition of six road signals, and three AD7656 chips can
The synchronous acquisition of 18 road signals is realized, the function of analog to digital conversion circuit is realized, and the data signal after conversion is sent to
DSP。
It is illustrated in figure 6 the interface circuit figure of AD7656 and TMS320F2812, VDR, RST, CON [ABC] of AD7656,
RD, CS, BUSY pin connects respectively DVDD, ADC_RST, PWM1, RE, IS, INT1_BIO pin of TMS320F2812,
The D [0] of AD7656～D [15] pin connects D0～D15 pins of TMS320F2812, the DGND pins connection of AD7656
The V of TMS320F2812SSPin is simultaneously grounded, and WR, STDBY pin of AD7656 is connected with+3.3V power supplys, the H/ of AD7656
SSEL, SER, RANGE, W/B pin is connected and is grounded.
AD7656 has two kinds of mode of operations：The parallel interface pattern of serial interface mode and high speed, it is main here to introduce simultaneously
Line interface pattern, parallel interface pattern can operate (W/B=0) that (W/B=in the form of space section may also be employed in the form of 1 space
1)。
When data are read from parallel bus, signal SER should be set to low level.When CS and RD are low level, number
To no longer be high-impedance state according to line D [0]～D [15], CS signals can be set to low level by permanent, and RD is used for accessing conversion
As a result, read operation is started when BUSY signals are low level.
Model TMS320F2812 that the DSP is adopted, DSP is used for the transformer sent to the A/D change-over circuits
Electric parameter data signal carries out virtual value, phase angle, active power, reactive power, power factor and transformer short-circuit reactance meter
Calculate, and denoising is carried out to ultrasonic digital signal.The read-write address wire of the dsp chip of model TMS320F2812
It is connected on USB after CPLD decodings.
Fig. 7 is the circuit connection diagram of USB (CY7C68013) chip, and Fig. 8 is DSP (TMS320F2812), CPLD and USB
(CY7C68013) circuit connection diagram.TMS320F2812 realizes being connected by CPLD and CY7C68013, the mark of CY7C68013
Will position (FLAGA, FLAGB, FLAGC) also passes through CPLD and is connected with TMS320F2812, specific connected mode as shown in figure 8,
XA [0], XA [1], XZCSOAND1, XZCSOAND7, XWE, XRD pin of TMS320F2812 AA0 respectively with CPLD, AA1,
XCS1, XCS2, WE, RD pin is connected, SLWR, SLRD, SLOE, FLAGA, FLAGB, FLAGC, FLAGCS, BA0, BA1 of CPLD
Pin is connected respectively with SLWR, SLRD, SLOE, FLAGA, FLAGB, FLAGC, FLAGCS, BA0, BA1 pin of CY7C68013.
When read operation is carried out to CY7C68013, XRD, XZCSOAND1, XA [0] of TMS320F2812, XA [1] control read signals
SLRD, when write operation is carried out to CY7C68013, XZCSOAND1, XA [0] of TMS320F2812, XA [1] control write signals
SLWR。
The PC be will calculate short-circuit reactance, normal short-circuit reactance, sampling voltage and current virtual value with
Phase angle, active power, reactive power, power factor are displayed on screen, and the short-circuit reactance for calculating and normal short circuit electricity
It is anti-to be compared, judge the variable quantity of short-circuit reactance preset threshold values which in the range of, and result is shown on screen；
Once exceeding the threshold values upper limit, phonetic alarm is sent a signal at once, remind staff to be overhauled；And to multiple ultrasounds
Ripple signal carries out process calculating, draws partial discharge position coordinate so as to be displayed on screen.
When using, monitoring device of the present utility model is connected between power transformer and the monitor supervision platform of transformer station,
As shown in Figure 1.Some uhf sensors are adsorbed on the fuel tank outer wall of transformer, the voltage sensor and current sense
Device connects respectively the voltage transformer secondary side summation current transformer secondary side of transformer station.
Winding in Power Transformer On-line Fault monitoring device of the present utility model when industrial implementation is carried out, in order to allow it to transport
Row result is relatively reliable, should take following measures：
1st, isolation and shielding measure,
Input, output circuit are effectively isolated by photo-coupler, by strong, weak electricity holding wire point when secondary circuit is connected up
Open, realize isolation, it is to avoid mutual induction and mutual interference affect between loop, the pds signal line of printed circuit board (PCB) and sub-power source line
Open, digital circuit and analog circuit separate, play good circuit isolation effect；
2nd, the process of power circuit,
Between power supply positive and negative electrode and connect and moved back between jumbo electric capacity, and all plug-in units and the power supply and ground of chip
Coupling electric capacity, zero-power line takes the mode of floating, can as far as possible reduce the distribution capacity between the casing of power line, it is to avoid dry
Disturb.
Using the diagnostic method of described Winding in Power Transformer On-line Fault monitoring device, as shown in figure 11, including such as
Lower step：
Step one：Uhf sensor gathers the ultrasonic signal of inside transformer, voltage sensor and current sensor
Respectively three-phase primary side, the voltage of secondary side and electricity are gathered by the secondary side of the voltage transformer summation current transformer of transformer station
Stream signal.
Step 2：Synchronizing signal sample circuit by step one gather power transformer each phase primary side, secondary side
Voltage and current signal be filtered, Zero-cross comparator, amplitude limiting processing so as to meet the input range of A/D change-over circuits.
Step 3：Signal conditioning circuit by the ultrasonic signal gathered in step one and in step 2, adopt by synchronizing signal
Each phase primary side, the voltage and current signal of secondary side after sample processing of circuit carries out bipolar processes, makes A/D change-over circuits pair
Negative signal also can normal acquisition, it is ensured that the integrality of signal.
Step 4：A/D change-over circuits are by the ultrasonic signal after step 3 is processed and each phase primary side, secondary side
Voltage, current signal carry out analog-to-digital conversion, obtain ultrasonic wave and each phase primary side, the voltage of secondary side, the data signal of electric current.
Step 5：By voltage sensor and current sensor gather second group of power transformer each phase primary side, two
The voltage and current signal of secondary side, and the signal is filtered by synchronizing signal sample circuit, at Zero-cross comparator, amplitude limit
Reason, then Jing signal conditioning circuits carry out bipolar processes, most after Jing A/D change-over circuits carry out analog-to-digital conversion, obtain second group it is electric
Each phase primary side of power transformer, the voltage of secondary side, the data signal of electric current；Simultaneously by each phase one of two groups of power transformers
The digital data transmission of secondary side, the voltage of secondary side, the data signal of electric current and ultrasonic wave is to DSP.
Step 6：The data signal of ultrasonic wave is carried out denoising by DSP using complementary set Empirical mode decomposition (CEEMD)
Process, and the data signal of each phase primary side to two groups of power transformers, the voltage of secondary side, electric current carry out virtual value,
Phase angle process, and then obtain each phase primary side, the voltage of secondary side, the phasor of the data signal of electric current of two groups of power transformers
Value；The online short-circuit reactance model of power transformer is set up, by each phase primary side of two groups of power transformers, the electricity of secondary side
Pressure, the phasor value of the data signal of electric current calculate electric power change as the input of the online short-circuit reactance model of power transformer
The short-circuit reactance value of each phase winding of depressor, using the short-circuit reactance value of each phase winding of power transformer as power transformer it is each around
The electric characteristic of group.
The signal denoising principle of described complementary set Empirical mode decomposition (CEEMD)：
The data signal Jing CEEMD of ultrasonic wave decomposes the j-th IMF component c for obtainingjIt is to be arranged from high to low according to frequency
, the noise major part of high frequency is occurred in forward component.For how to draw a clear in component noise and noise in component with it is true
The boundary of real signal, sets here a criterion：The energy density of each rank IMF components of white noise is corresponding flat with its
The product in cycle is approximately 2, i.e.,：
Cui=EnTn≈2 (1)
In formula, CuiThe product of energy density and its corresponding average period for each rank IMF components of white noise,The energy density of the n-th order IMF component of white noise is represented, N is the data length of the component, Tn=
N/Nmax, represent the energy density corresponding average period of the n-th order IMF component of white noise, NmaxFor the maximum in the component
The number of point, imfnI () is n-th IMF component of the component that data length is i.
Order
Ccj=EnTn (2)
cjEnAnd TnCalculate according to above-mentioned formula, CcjFor each c of gainedjEnergy density and average period product.
Following metewand is set：
If a close 0, it is believed that cjComponent includes most noise, can directly intercept；If a is larger, its
Comprising signal component it is more, should retain.With this conclusion to the c that obtainsjComponent is intercepted, remaining cjComponent is added and obtains final product
Signal to after denoising.
Here by taking three-phase three winding step-down transformer as an example, as shown in figure 9, primary side is referred to as high-pressure side, secondary side difference
Referred to as medium voltage side and low-pressure side.Transformer Short Circuit Impedance is the equiva lent impedance of the transformer when load impedance is zero, short-circuit impedance
Reactive component be short-circuit reactance, be exactly the leakage reactance of winding；Short-circuit reactance has with the relative position and physical dimension of winding
Close, by the deformation for monitoring the short-circuit reactance of transformer to check winding, the change of stray field directly influences winding leakage
The change of sense, that is, affect the change of leakage reactance, and then short-circuit reactance also just to change.In figure：Z1、R1、X1Respectively transformer
On high-tension side impedance, resistance, reactance, Z1=R1+jX1；Z2、R2、X2The respectively impedance of transformer medium voltage side, resistance, reactance, Z2
=R2+jX2；Z′2、R′2、X′2Respectively the impedance of transformer medium voltage side, resistance, reactance are on high-tension side reduced value, Z '2=R '2
+jX′2；Z3、R3、X3The respectively impedance of step down side, resistance, reactance, Z3=R3+jX3；Z′3、R′3、X′3Respectively become
Impedance, resistance, the reactance of depressor low-pressure side is on high-tension side reduced value, Z '3=R '3+jX′3；Zm、Rm、XmRespectively transformer is encouraged
The impedance of magnetic branch road, resistance, reactance, Zm=Rm+jXm；For high voltage side of transformer voltage,Exist for transformer medium voltage side voltage
On high-tension side reduced value,It is step down side voltage on high-tension side reduced value；For the exciting current of transformer,For
High voltage side of transformer electric current,It is transformer medium voltage side electric current on high-tension side reduced value,It is step down side electric current in height
The reduced value of pressure side.Fig. 2 is the single-phase equivalent model sketch of the three-phase three winding of power transformer.
The method of the described online short-circuit reactance model for setting up power transformer, specifically includes following steps：
Using Kirchhoff's second law (KVL), transformer equivalent model as shown in Figure 9 can draw：
In formula,For high voltage side of transformer voltage,It is transformer medium voltage side voltage on high-tension side reduced value,To become
Depressor low-pressure side voltage on high-tension side reduced value,For high voltage side of transformer electric current,It is transformer medium voltage side electric current in high pressure
The reduced value of side,It is step down side electric current on high-tension side reduced value, Z1For the impedance of high voltage side of transformer, Z '2To become
The impedance of depressor medium voltage side is on high-tension side reduced value, Z '3For step down side impedance on high-tension side reduced value;
According toFurther arrange formula (4) to obtain：
In formula,For high voltage side of transformer voltage,It is transformer medium voltage side voltage on high-tension side reduced value,To become
Depressor low-pressure side voltage on high-tension side reduced value,For high voltage side of transformer electric current,It is transformer medium voltage side electric current in high pressure
The reduced value of side,It is step down side electric current on high-tension side reduced value, Z1For the impedance of high voltage side of transformer, Z '2To become
The impedance of depressor medium voltage side is on high-tension side reduced value, Z '3For step down side impedance on high-tension side reduced value, k12For
The no-load voltage ratio of high pressure and middle pressure, k13For the no-load voltage ratio of high pressure and low pressure,For transformer medium voltage side voltage,For step down side
Voltage,For transformer medium voltage side electric current,For step down side electric current；
Change the load of transformer in rated range, measure the high pressure of two groups of transformers to be measured in the case of different loads
The voltage and current of side, medium voltage side and low-pressure side, and bring measure two groups of voltage and currents into formula (5) and draw：
In formula, k12For the no-load voltage ratio of high pressure and middle pressure, k13For high pressure and the no-load voltage ratio of low pressure, Z1For the resistance of high voltage side of transformer
It is anti-, Z '2For transformer medium voltage side impedance on high-tension side reduced value, Z '3For step down side impedance on high-tension side folding
Calculation value,For the high voltage side of transformer voltage of first group of acquisition,For the high voltage side of transformer voltage of second group of acquisition,
For the transformer medium voltage side voltage of first group of acquisition,For the transformer medium voltage side voltage of second group of acquisition,For second group
The step down side voltage of acquisition,For the high voltage side of transformer electric current of first group of acquisition,For the transformation of second group of acquisition
Device high voltage side current,For the transformer medium voltage side electric current of first group of acquisition,For the transformer medium voltage side electricity of second group of acquisition
Stream,For the step down side electric current of second group of acquisition；
Formula (6) is further solved, high, medium and low short-circuit impedance computing formula is drawn：
In formula, Z1For the impedance of high voltage side of transformer, Z '2For transformer medium voltage side impedance on high-tension side reduced value,
Z′3For step down side impedance on high-tension side reduced value, k12For the no-load voltage ratio of high pressure and middle pressure, k13For high pressure and low pressure
No-load voltage ratio,For the high voltage side of transformer voltage of first group of acquisition,For the high voltage side of transformer voltage of second group of acquisition,
For the transformer medium voltage side voltage of first group of acquisition,For the transformer medium voltage side voltage of second group of acquisition,For first group
The step down side voltage of acquisition,For the step down side voltage of second group of acquisition,For the change of first group of acquisition
Depressor high voltage side current,For the high voltage side of transformer electric current of second group of acquisition,For the transformer medium voltage side of first group of acquisition
Electric current,For the transformer medium voltage side electric current of second group of acquisition,For the step down side electric current of first group of acquisition,For
The step down side electric current of second group of acquisition；
The online short-circuit reactance model of power transformer is drawn by formula (7)：
XK=Im { Z1+Z2+Z′3} (8)
In formula, Z1For the impedance of high voltage side of transformer, Z '2For transformer medium voltage side impedance on high-tension side reduced value,
Z′3For step down side impedance on high-tension side reduced value, Im { } is the imaginary values for taking plural number, and three imaginary values are all electricity
It is anti-, XKFor the short-circuit reactance value of power transformer.
Step 7：It is super after by the short-circuit reactance value of each phase winding of the power transformer drawn in step 6 and denoising
The data signal of sound wave is by USB transmission to PC.
Step 8：PC further processes the ultrasonic digital signal after denoising, show that shelf depreciation is sat
Mark, judges partial discharge position, and is displayed on screen；The upper limit threshold values and lower limit of short-circuit reactance rate of change are set on PC
Threshold values, and the short-circuit reactance value of each phase winding of power transformer is short with each phase winding of the trouble-free power transformer of history
Road reactance value is compared, and then draws short-circuit reactance rate of change；By by the above-mentioned short-circuit reactance rate of change for drawing with setting
The upper limit threshold values and lower limit threshold values of good short-circuit reactance rate of change is compared, and then judges the working condition of Transformer Winding,
And include result of determination and each phase primary side, the voltage of secondary side, the phasor of current digital signal, phase angle and virtual value in screen
On curtain；If short-circuit reactance rate of change is less than lower limit threshold values, the result that PC shows is normal；If short-circuit reactance rate of change is upper
Between limit threshold values and lower limit threshold values, then PC shows there are potential faults；If short-circuit reactance rate of change is more than upper limit threshold values, PC
Machine shows failure and sends a signal to phonetic alarm, sends alert notification correlation maintainer and overhauled.
Described PC further processes the ultrasonic digital signal after denoising, show that shelf depreciation is sat
Mark, judges partial discharge position, and is displayed on screen, specifically includes following steps：
Partial discharge monitoring Mathematical Modeling is set up in PC, by the ultrasonic digital signal after denoising
As the input of the model, the optimal solution of shelf depreciation coordinate is drawn, so as to judge the concrete partial discharge position of inside transformer,
And be displayed on screen；
The described method for setting up partial discharge monitoring Mathematical Modeling is as follows：
As shown in Figure 10, if M (x, y, z) is the concrete partial discharge position coordinate of inside transformer, adsorb in transformer
The coordinate of three uhf sensors on fuel tank outer wall is respectively N0(x0, y0, z0)、N1(x1, y1, z1)、N2(x2, y2, z2), surpass
Time required for acoustic signals three uhf sensors of arrival is respectively T0、T1、T2, its distance respectively L0、L1、L2, its
The equivalent velocity of sound is v, is obtained by equation in coordinates：
T cannot be directly obtained using sound-acoustic fix ranging method0、T1、T2, but can be to obtain the time difference t between them1、t2,
Wherein：
Equation (9) will be introduced the time difference to obtain：
It is generalized to general type to obtain：
In formula (12), i=0,1,2...n, as i=0, t0=0；Requirement solves out shelf depreciation coordinate, needs formula
(12) solution is reconstructed, reconstruction of function is：
Make fiMinimum, now：
Formula (14) is also necessary for minimum, then to have reformed into a binding character optimized for shelf depreciation method for ultrasonic locating
Problem, partial discharge monitoring Mathematical Modeling is：
Said method is incorporated in the MATLAB in PC, using MATLAB the optimal solution of shelf depreciation coordinate is solved,
And coordinate is displayed on the screen of PC, so as to realize the on-line monitoring of inside transformer partial discharge position.
Finally it should be noted that：Described embodiment is only some embodiments of the present application, rather than the reality of whole
Apply example.Based on the embodiment in the application, those of ordinary skill in the art are obtained under the premise of creative work is not made
Every other embodiment, belong to the protection domain of the application.
Claims (3)
1. a kind of Winding in Power Transformer On-line Fault monitoring device, it is characterised in that including uhf sensor, voltage sensor
Device, current sensor, synchronizing signal sample circuit, signal conditioning circuit, A/D change-over circuits, DSP, CPLD, USB, PC and language
Sound alarm；The output end of voltage sensor and current sensor connects the input of synchronizing signal sample circuit, synchronizing signal
The output end of sample circuit and uhf sensor connects the input of signal conditioning circuit, and the output end of signal conditioning circuit connects
The input of A/D change-over circuits is connect, the output end of A/D change-over circuits connects the input of DSP, and the output end of DSP is with CPLD's
Input is connected, and the output end of CPLD is connected with PC by USB, and PC is connected with phonetic alarm.
2. Winding in Power Transformer On-line Fault monitoring device according to claim 1, it is characterised in that the synchronous letter
Number sample circuit includes the first operational amplifier, the second operational amplifier, first resistor, second resistance, 3rd resistor, the 4th electric
Resistance, the 5th resistance, the first electric capacity, the second electric capacity and the 3rd electric capacity, the negative input end of the first operational amplifier and its output end phase
Connection, positive input terminal is connected with one end of first resistor, the first electric capacity, the other end ground connection of the first electric capacity, first resistor
The other end is the input of synchronizing signal sample circuit；The output end of the first operational amplifier connects one end of second resistance, the
The other end of two resistance connects the positive input terminal of the second electric capacity, one end of the 4th resistance and the second operational amplifier, the second electric capacity
Other end ground connection, the other end of the 4th resistance connects the output end of the second operational amplifier, the second operational amplifier it is negative defeated
Enter one end of end connection 3rd resistor, the other end ground connection of 3rd resistor；The output end connection the 5th of the second operational amplifier is electric
Resistance and one end of the 3rd electric capacity, the other end connection power supply of the 5th resistance, the other end ground connection of the 3rd electric capacity, the second operation amplifier
The output end of device is the output end of synchronizing signal sample circuit.
3. Winding in Power Transformer On-line Fault monitoring device according to claim 1, it is characterised in that the signal is adjusted
Reason circuit include the 3rd operational amplifier, four-operational amplifier, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance,
Tenth resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the first diode and the second diode, the 3rd operation amplifier
The positive input terminal of device connects one end of the 7th resistance, and the other end of the 7th resistance connects the positive pole of the first diode；3rd computing
The negative input end of amplifier connects one end of the 6th resistance and the tenth resistance, the other end of the 6th resistance and one end of the 8th resistance
After being connected, it is connected with signal input part Vi, the other end of the 8th resistance is connected with the negative input end of four-operational amplifier
Connect；The other end of the tenth resistance is connected with one end of the 12nd resistance and the output end of the 3rd operational amplifier, and the 12nd is electric
After the other end of resistance is connected with the negative pole of the first diode, it is connected with signal output part Vo2；Four-operational amplifier is just
Input is connected with one end of the 9th resistance and the 11st resistance, the other end of the 9th resistance and the positive pole phase of the second diode
Connect and be grounded, the other end of the 11st resistance is connected with one end of the 13rd resistance and the output end of four-operational amplifier
Connect, after the other end of the 13rd resistance is connected with the negative pole of the second diode, be connected with signal output part Vo1.
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| CN201621118104.3U CN206114823U (en) | 2016-10-12 | 2016-10-12 | Power transformer winding trouble on -line monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621118104.3U CN206114823U (en) | 2016-10-12 | 2016-10-12 | Power transformer winding trouble on -line monitoring device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405317A (en) * | 2016-10-12 | 2017-02-15 | 国网辽宁省电力有限公司电力科学研究院 | Power transformer winding fault online monitoring device and diagnosis method |
| CN112487619A (en) * | 2020-11-19 | 2021-03-12 | 国网四川省电力公司电力科学研究院 | Method and system for rapidly acquiring neutral point overvoltage of three-winding autotransformer |
| CN113075512A (en) * | 2021-04-01 | 2021-07-06 | 陕西省地方电力（集团）有限公司 | Sound detection-based transformer discharge fault diagnosis method and system |
| CN113283289A (en) * | 2021-04-13 | 2021-08-20 | 上海电力大学 | CEEMD-MFE and t-SNE based partial discharge mode identification method |
| CN117929953A (en) * | 2024-03-21 | 2024-04-26 | 山西辉能科技有限公司 | Device for measuring partial discharge of transformer |
-
2016
- 2016-10-12 CN CN201621118104.3U patent/CN206114823U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405317A (en) * | 2016-10-12 | 2017-02-15 | 国网辽宁省电力有限公司电力科学研究院 | Power transformer winding fault online monitoring device and diagnosis method |
| CN106405317B (en) * | 2016-10-12 | 2024-04-12 | 国网辽宁省电力有限公司电力科学研究院 | Power transformer winding fault on-line monitoring device and diagnosis method |
| CN112487619A (en) * | 2020-11-19 | 2021-03-12 | 国网四川省电力公司电力科学研究院 | Method and system for rapidly acquiring neutral point overvoltage of three-winding autotransformer |
| CN113075512A (en) * | 2021-04-01 | 2021-07-06 | 陕西省地方电力（集团）有限公司 | Sound detection-based transformer discharge fault diagnosis method and system |
| CN113283289A (en) * | 2021-04-13 | 2021-08-20 | 上海电力大学 | CEEMD-MFE and t-SNE based partial discharge mode identification method |
| CN117929953A (en) * | 2024-03-21 | 2024-04-26 | 山西辉能科技有限公司 | Device for measuring partial discharge of transformer |
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