CN107589330A - A kind of electrification detection system and method for power transformer loss - Google Patents
A kind of electrification detection system and method for power transformer loss Download PDFInfo
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Abstract
The present invention discloses a kind of electrification detection system and method for power transformer loss, and primary side voltage transformer input is connected respectively with power transformer high-pressure side and low-pressure side in system, its output end access isolating transformer；Primary side current transformer input is connected by jaw with power transformer high-pressure side and low pressure side ports, its output end access secondary side current transformer；Isolating transformer output end is connected with secondary side voltage transformer input；Secondary side current transformer output end is connected with light-coupled isolation module input；Optical coupling module output end and secondary side voltage transformer output end are connected with signal acquiring system input, signal acquiring system output end connection master system；Master system is used for the voltage and current signal extraction and analysis to collecting and finally gives the open circuit loss and load loss of power transformer.The present invention is capable of the loss state of accurate judgement power transformer, has the characteristics of calculating in real time and live testing, test accuracy is high.
Description
Technical field
The present invention relates to power transformer technical field, more particularly to a kind of live detection system of power transformer loss
System.
Background technology
Power transformer is the electrical equipment for changing alternating voltage size, according to the principle of electromagnetic induction, a certain
The alternating voltage of grade is transformed into the alternating voltage of another grade, to meet the different demands of various power equipments, therefore electric power
Transformer has very important status in power industry.With the development of electric utility, transformer species is increasing, from
High voltage, the Large Copacity of low-voltage, low capacity till now, nowadays, the voltage class and capacity of transformer are even up to
Hundred ten thousand volts, million kilovolt-amperes of levels.As indispensable equipment for power transmission and distribution in power system, power in power system is responsible for
Transmission and voltage, the task of current transformation, its performance quality directly affect safe and reliable, economic, the efficient operation of power network.
The loss of power transformer can be divided into open circuit loss and load loss.Open circuit loss refers to the shape of no-load transformer
It is lost, is mainly caused by magnetic hystersis loss and eddy-current loss, with voltage, frequency, iron core caused by electrical transformer cores under state
The factors such as material are relevant.Load loss refer to power transformer under conditions of load by caused loss on winding internally,
It is mainly related to load.Loss state in transformer is be to determine transformer operating temperature an important factor for.Work as electric power
When the loss of transformer is higher, its operating temperature can gradually rise, and reduce the reliability of power transformer, and influence transformer
Normal operating conditions and its working life.And when temperature is raised, the open circuit loss and load loss of power transformer can be by
Influence and further increase, form the further growth that positive feedback promotes temperature, accelerate the aging of inside transformer insulation system
Speed, the working condition of transformer is influenceed, the final service life for reducing transformer.Our times energy growing tension, energy-conservation
Have become the problem that the whole society pays close attention to and studied jointly, so the harmonic loss of research transformer is to saving the energy, optimization ring
Border, auxiliary realize that the wastage reducing and energy saving of power network is significant.
The method that detection currently for power transformer loss typically uses off-line test, i.e., become electric power in detection
Depressor is cut off from grid side, adds rated voltage and by the open circuit loss of high-pressure side open test power transformer in its low-pressure side,
Add rated current in its high-pressure side and by the load loss of low-pressure side short-circuit test power transformer.The method operation of off-line test
Complexity, and power transformer need to be cut off under the state of putting into operation, in light load and it can only can provide phase by auxiliary power transformer
Answer load to make to complete, there is larger limitation.It is proposed to this end that the band of power transformer open circuit loss and load loss
Electric test method, by testing power transformer high-pressure side and the size of low-pressure side electric current and voltage respectively, it is derived by electric power
The open circuit loss and load loss of transformer.But limited by the measurement accuracy of primary side and secondary side measuring apparatus, and
The systematic error that each electronic device of measurement process is brought, have one to the test result of power transformer open circuit loss and load loss
It is fixing to ring.
Chinese patent application discloses No. CN104502738A, and open " a kind of transformer loss monitoring device " utilizes high pressure
Table and low-pressure meter measuring transformer internal loss, and test result is transmitted by way of wireless signal communication.This method is only
Suitable for the test of low-voltage-grade power transformer, and there is letter in the mode of wireless signal communication under strong electromagnetic interference environment
The problems such as number of poor quality, garbage signal coupling, so as to influence final test result.
Chinese patent application the CN201410438533.8th, a kind of open " three-winding transformer loss on-line measurement system
System " is tested the loss of three winding power transformer using voltage transformer summation current transformer.Voltage in this patent application
Transformer and current transformer easily damage without isolation to signal acquiring system.Become in signal analysis using Fourier
The method for changing superposition each harmonic loss is calculated final loss result, on easy coupled voltages transformer summation current transformer
Each harmonic, final result of calculation is interfered.
In summary, also none of these methods can realize the open circuit loss of power transformer and the high accuracy of load loss
On-line measurement, need a kind of new means of testing and detection method badly.
The content of the invention
It is an object of the invention to provide a kind of electrification detection system of power transformer loss, asked with solving above-mentioned technology
Topic.The present invention is applied to the open circuit loss of voltage levels power transformer and the live detection of load loss, can accurately sentence
The loss state of disconnected power transformer, there is the characteristics of calculating in real time and live testing, and possess higher test accuracy.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of electrification detection system of power transformer loss, including primary side voltage transformer, primary side current mutual inductance
Device, isolating transformer, secondary side current transformer, secondary side voltage transformer, light-coupled isolation module, signal acquiring system and on
Position machine system；Primary side voltage transformer input is connected respectively with power transformer high-pressure side and low-pressure side, and it exports termination
Enter isolating transformer；Primary side current transformer input passes through jaw and power transformer high-pressure side and low pressure side ports phase
Connect, its output end access secondary side current transformer；Isolating transformer output end is connected with secondary side voltage transformer input；
Secondary side current transformer output end is connected with light-coupled isolation module input；Optical coupling module output end and secondary side mutual induction of voltage
Device output end is connected with signal acquiring system input, signal acquiring system output end connection master system；Master system
For the voltage to collecting and current signal extraction and analysis and finally give the open circuit loss of power transformer and load damage
Consumption.
Further, primary side voltage transformer includes voltage transformer ptA, voltage transformer ptB, voltage transformer
PTC, voltage transformer ptX, voltage transformer ptY, voltage transformer ptZ；Wherein, voltage transformer ptAInput becomes with electric power
Depressor high-pressure side A phases are connected, voltage transformer ptBInput is connected with power transformer high-pressure side B phases, voltage transformer ptCIt is defeated
Enter end with power transformer high-pressure side C phases to be connected, voltage transformer ptXInput is connected with low-tension side of power transformer A phases, electricity
Press transformer PTYInput is connected with low-tension side of power transformer B phases, voltage transformer ptZInput and power transformer low pressure
Side C phases are connected；
Isolating transformer includes isolating transformer ITA, isolating transformer ITB, isolating transformer ITC, isolating transformer ITX,
Isolating transformer ITY, isolating transformer ITZ；Wherein, isolating transformer ITAInput and voltage transformer ptAOutput end is connected
Connect, isolating transformer ITBInput and voltage transformer ptBOutput end is connected, isolating transformer ITCInput is mutual with voltage
Sensor PTCOutput end is connected, isolating transformer ITXInput and voltage transformer ptXOutput end is connected, isolating transformer
ITYInput and voltage transformer ptYOutput end is connected, isolating transformer ITZInput and voltage transformer ptZOutput end
It is connected；
Secondary side voltage transformer includes voltage transformer pta, voltage transformer ptb, voltage transformer ptc, mutual induction of voltage
Device PTx, voltage transformer pty, voltage transformer ptz；Wherein, voltage transformer ptaInput and isolating transformer ITAOutput end
It is connected, voltage transformer ptbInput and isolating transformer ITBOutput end is connected, voltage transformer ptcInput with every
From transformer ITCOutput end is connected, voltage transformer ptxInput and isolating transformer ITXOutput end is connected, and voltage is mutual
Sensor PTyInput and isolating transformer ITYOutput end is connected, voltage transformer ptzInput and isolating transformer ITZIt is defeated
Go out end to be connected.
Further, primary side current transformer includes Current TransmitA, Current TransmitB, current transformer
CTC, Current TransmitX, current transformer includes CTY, current transformer includes CTZ；Wherein, Current TransmitAInput
It is connected with power transformer high-pressure side A phases, Current TransmitBInput is connected with power transformer high-pressure side B phases, and electric current is mutual
Sensor CTCInput is connected with power transformer high-pressure side C phases, Current TransmitXInput and low-tension side of power transformer A
It is connected, Current TransmitYInput is connected with low-tension side of power transformer B phases, Current TransmitZInput and electric power
Step down side C phases are connected；
Secondary side current transformer includes Current Transmita, Current Transmitb, Current Transmitc, Current Mutual Inductance
Device CTx, current transformer includes CTy, Current Transmitz；Wherein, Current TransmitaInput and Current TransmitAIt is defeated
Go out end to be connected, Current TransmitbInput and Current TransmitBOutput end is connected, Current TransmitcInput
With Current TransmitCOutput end is connected, Current TransmitxInput and Current TransmitXOutput end is connected, electricity
Current transformer CTyInput and Current TransmitYOutput end is connected, Current TransmitzInput and current transformer
CTZOutput end is connected；
Light-coupled isolation module includes optical coupling isolation module OCa, optical coupler module OCb, optical coupler module OCc, optocoupler matched moulds
Block OCx, optical coupler module OCy, optical coupler module OCz；Wherein, optical coupler module OCaInput and Current TransmitaOutput end
It is connected, optical coupler module OCbInput and Current TransmitbOutput end is connected, optical coupler module OCcInput and electricity
Current transformer CTcOutput end is connected, optical coupler module OCxInput and Current TransmitxOutput end is connected, optical coupling
Module OCyInput and Current TransmityOutput end is connected, optical coupler module OCzInput and Current TransmitzIt is defeated
Go out end to be connected.
Further, signal acquiring system includes voltage acquisition card and current acquisition card；Voltage acquisition card input is distinguished
With voltage transformer pta, voltage transformer ptb, voltage transformer ptc, voltage transformer ptx, voltage transformer pty, voltage it is mutual
Sensor PTzOutput end is connected；Current acquisition card input respectively with light-coupled isolation module OCa, light-coupled isolation module OCb, optocoupler every
From module OCc, light-coupled isolation module OCx, light-coupled isolation module OCy, light-coupled isolation module OCzOutput end is connected；Signal acquisition system
The output result united for the mounted secondary side voltage transformer of acquisition time and secondary side current transformer, by continuous transformation
Voltage and the real-time discrete acquisitions of current signal, and collection result is sent to master system.
Further, master system according to collect discrete voltage, current signal, according to predetermined open circuit loss and
Load loss computational methods, the open circuit loss and load loss of power transformer are calculated in real time；
The predetermined open circuit loss and load loss computational methods are：
Before the electrification detection system test power transformer open circuit loss and load loss of power transformer loss, profit
The voltage and current test result for the electrification detection system that power transformer is lost with reference instrument is demarcated and drawn out
Voltage calibration curve fuWith calibration with current signal curve fi；
If the voltage signal sequence that the electrification detection system for making power transformer be lost respectively is tested to obtain is Ua, Ub, Uc,
Ux, Uy, Uz, current signal sequence is Ia, Ib, Ic, Ix, Iy, Iz；It is then f by voltage signal sequence variation using calibration curveu
(Ua),fu(Ub),fu(Uc),fu(Ux),fu(Uy),fu(Uz)；Current signal sequence variation is fi(Ia), fi(Ib), fi(Ic), fi
(Ix), fi(Iy), fi(Iz)；According to standard conversion it is Yy0 type power transformer voltages and electric current first by voltage and current signal
Size, it is perunit value that subsequent voltage and current sequence are directly converted according to power transformer grade；If signal acquiring system exists
12n point is gathered in 0.02s altogether, then power transformer high-pressure side A phase perunit value voltage signal sequences f after convertingu’(Ua) represent
For：
fu'(Ua)=[fu'(Ua0),fu'(Ua1),fu'(Ua2),…,fu'(Uai),…,fu'(Uan)]
Power transformer high-pressure side A phase current signal sequences are expressed as：
fi'(Ia)=[fi'(Ia0),fi'(Ia1),fi'(Ia2),…,fi'(Iai),…,fi'(Ian)]
The on high-tension side power of power transformer A phases is expressed as：
Power transformer high-pressure side B phases, C phases and low-tension side of power transformer X phases, Y phases, the power of Z phases are respectively according to upper
Formula calculates；The loss power of power transformer is expressed as：
PAlways=PA+PB+PC-PX-PY-PZ
The open circuit loss of power transformer is expressed as：
The load loss of power transformer is expressed as：
A kind of live detection method of power transformer loss, the live detection system based on a kind of loss of power transformer
System；The electrification detection system of the power transformer loss includes primary side voltage transformer, primary side current transformer, isolation
Transformer, secondary side current transformer, secondary side voltage transformer, light-coupled isolation module, signal acquiring system and host computer system
System；Primary side voltage transformer input is connected respectively with power transformer high-pressure side and low-pressure side, the access isolation of its output end
Transformer；Primary side current transformer input is connected by jaw with power transformer high-pressure side and low pressure side ports, and its is defeated
Go out and terminate into secondary side current transformer；Isolating transformer output end is connected with secondary side voltage transformer input；Secondary side
Current transformer output end is connected with light-coupled isolation module input；Optical coupling module output end and the output of secondary side voltage transformer
End is connected with signal acquiring system input, signal acquiring system output end connection master system；Master system be used for pair
The voltage and current signal extraction and analysis that collect simultaneously finally give the open circuit loss and load loss of power transformer；
The live detection method of the power transformer loss, comprises the following steps：Master system is according to collecting
Discrete voltage, current signal, according to predetermined open circuit loss and load loss computational methods, calculate the sky of power transformer in real time
Load-loss and load loss；
The predetermined open circuit loss and load loss computational methods are：
Before the electrification detection system test power transformer open circuit loss and load loss of power transformer loss, profit
The voltage and current test result for the electrification detection system that power transformer is lost with reference instrument is demarcated and drawn out
Voltage calibration curve fuWith calibration with current signal curve fi；
If the voltage signal sequence that the electrification detection system for making power transformer be lost respectively is tested to obtain is Ua, Ub, Uc,
Ux, Uy, Uz, current signal sequence is Ia, Ib, Ic, Ix, Iy, Iz；It is then f by voltage signal sequence variation using calibration curveu
(Ua),fu(Ub),fu(Uc),fu(Ux),fu(Uy),fu(Uz)；Current signal sequence variation is fi(Ia), fi(Ib), fi(Ic), fi
(Ix), fi(Iy), fi(Iz)；According to standard conversion it is Yy0 type power transformer voltages and electric current first by voltage and current signal
Size, it is perunit value that subsequent voltage and current sequence are directly converted according to power transformer grade；If signal acquiring system exists
12n point is gathered in 0.02s altogether, then power transformer high-pressure side A phase perunit value voltage signal sequences f after convertingu’(Ua) represent
For：
fu'(Ua)=[fu'(Ua0),fu'(Ua1),fu'(Ua2),…,fu'(Uai),…,fu'(Uan)]
Power transformer high-pressure side A phase current signal sequences are expressed as：
fi'(Ia)=[fi'(Ia0),fi'(Ia1),fi'(Ia2),…,fi'(Iai),…,fi'(Ian)]
The on high-tension side power of power transformer A phases is expressed as：
Power transformer high-pressure side B phases, C phases and low-tension side of power transformer X phases, Y phases, the power of Z phases are respectively according to upper
Formula calculates；The loss power of power transformer is expressed as：
PAlways=PA+PB+PC-PX-PY-PZ
The open circuit loss of power transformer is expressed as：
The load loss of power transformer is expressed as：
Further, primary side voltage transformer includes voltage transformer ptA, voltage transformer ptB, voltage transformer
PTC, voltage transformer ptX, voltage transformer ptY, voltage transformer ptZ；Wherein, voltage transformer ptAInput becomes with electric power
Depressor high-pressure side A phases are connected, voltage transformer ptBInput is connected with power transformer high-pressure side B phases, voltage transformer ptCIt is defeated
Enter end with power transformer high-pressure side C phases to be connected, voltage transformer ptXInput is connected with low-tension side of power transformer A phases, electricity
Press transformer PTYInput is connected with low-tension side of power transformer B phases, voltage transformer ptZInput and power transformer low pressure
Side C phases are connected；
Isolating transformer includes isolating transformer ITA, isolating transformer ITB, isolating transformer ITC, isolating transformer ITX,
Isolating transformer ITY, isolating transformer ITZ；Wherein, isolating transformer ITAInput and voltage transformer ptAOutput end is connected
Connect, isolating transformer ITBInput and voltage transformer ptBOutput end is connected, isolating transformer ITCInput is mutual with voltage
Sensor PTCOutput end is connected, isolating transformer ITXInput and voltage transformer ptXOutput end is connected, isolating transformer
ITYInput and voltage transformer ptYOutput end is connected, isolating transformer ITZInput and voltage transformer ptZOutput end
It is connected；
Secondary side voltage transformer includes voltage transformer pta, voltage transformer ptb, voltage transformer ptc, mutual induction of voltage
Device PTx, voltage transformer pty, voltage transformer ptz；Wherein, voltage transformer ptaInput and isolating transformer ITAOutput end
It is connected, voltage transformer ptbInput and isolating transformer ITBOutput end is connected, voltage transformer ptcInput with every
From transformer ITCOutput end is connected, voltage transformer ptxInput and isolating transformer ITXOutput end is connected, and voltage is mutual
Sensor PTyInput and isolating transformer ITYOutput end is connected, voltage transformer ptzInput and isolating transformer ITZIt is defeated
Go out end to be connected.
Further, primary side current transformer includes Current TransmitA, Current TransmitB, current transformer
CTC, Current TransmitX, current transformer includes CTY, current transformer includes CTZ；Wherein, Current TransmitAInput
It is connected with power transformer high-pressure side A phases, Current TransmitBInput is connected with power transformer high-pressure side B phases, and electric current is mutual
Sensor CTCInput is connected with power transformer high-pressure side C phases, Current TransmitXInput and low-tension side of power transformer A
It is connected, Current TransmitYInput is connected with low-tension side of power transformer B phases, Current TransmitZInput and electric power
Step down side C phases are connected；
Secondary side current transformer includes Current Transmita, Current Transmitb, Current Transmitc, Current Mutual Inductance
Device CTx, current transformer includes CTy, Current Transmitz；Wherein, Current TransmitaInput and Current TransmitAIt is defeated
Go out end to be connected, Current TransmitbInput and Current TransmitBOutput end is connected, Current TransmitcInput
With Current TransmitCOutput end is connected, Current TransmitxInput and Current TransmitXOutput end is connected, electricity
Current transformer CTyInput and Current TransmitYOutput end is connected, Current TransmitzInput and current transformer
CTZOutput end is connected；
Light-coupled isolation module includes optical coupling isolation module OCa, optical coupler module OCb, optical coupler module OCc, optocoupler matched moulds
Block OCx, optical coupler module OCy, optical coupler module OCz；Wherein, optical coupler module OCaInput and Current TransmitaOutput end
It is connected, optical coupler module OCbInput and Current TransmitbOutput end is connected, optical coupler module OCcInput and electricity
Current transformer CTcOutput end is connected, optical coupler module OCxInput and Current TransmitxOutput end is connected, optical coupling
Module OCyInput and Current TransmityOutput end is connected, optical coupler module OCzInput and Current TransmitzIt is defeated
Go out end to be connected.
Further, signal acquiring system includes voltage acquisition card and current acquisition card；Voltage acquisition card input is distinguished
With voltage transformer pta, voltage transformer ptb, voltage transformer ptc, voltage transformer ptx, voltage transformer pty, voltage it is mutual
Sensor PTzOutput end is connected；Current acquisition card input respectively with light-coupled isolation module OCa, light-coupled isolation module OCb, optocoupler every
From module OCc, light-coupled isolation module OCx, light-coupled isolation module OCy, light-coupled isolation module OCzOutput end is connected；Signal acquisition system
The output result united for the mounted secondary side voltage transformer of acquisition time and secondary side current transformer, by continuous transformation
Voltage and the real-time discrete acquisitions of current signal, and collection result is sent to master system.
Relative to prior art, the present invention has advantages below：
1st, measure real-time.The system is capable of the open circuit loss and load loss of the powered power transformer of detection in real time,
Reach the purpose of detection power transformer loss state in real time, to determine power transformer internal temperature, working condition and life-span
Estimate and corresponding foundation is provided.
2nd, measurement object scope is wide.The system can change primary side and two according to the power transformer of different voltage class
Secondary side voltage transformer summation current transformer, just can be to different power levelses, different model in the case of need to only completing demarcation
And the power transformer of capacity completes loss detection, use range is wider.
3rd, detecting system is safe.The primary side and secondary side voltage transformer of the system are completed using isolating transformer
Isolation, secondary side current transformer and signal acquiring system are isolated using light-coupled isolation module, ensure that signal acquisition system
System, host computer and operating personnel isolate with primary side voltage and current all the time, improve the security performance of measuring system.
4th, the open circuit loss and load loss measured using perunit value.The sky of power transformer is calculated using perunit value
Load-loss and load loss, the power transformer for being easy to different classes of are compared to each other, it is easier to determine the work of power transformer
State, improve the operability of this set system.
Brief description of the drawings
Fig. 1 is a kind of theory diagram of the electrification detection system of power transformer loss of the present invention.
Fig. 2 is the present invention a kind of the electrification detection system mounting means and connection figure of power transformer loss.
Fig. 3 is that open circuit loss and load loss test equivalent schematic.
Fig. 4 is detection method flow chart.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described:
Referring to Fig. 1 to Fig. 2, a kind of power transformer of the invention loss electrification detection system, including primary side voltage are mutual
Sensor, primary side current transformer, isolating transformer, secondary side current transformer, secondary side voltage transformer, light-coupled isolation mould
Block, signal acquiring system and master system.
Primary side voltage transformer input is connected respectively with power transformer high-pressure side and low-pressure side, the access of its output end
Isolating transformer；Primary side current transformer input is connected by jaw with power transformer high-pressure side and low pressure side ports,
Its output end accesses secondary side current transformer；Isolating transformer output end is connected with secondary side voltage transformer input；Two
Secondary side current transformer output end is connected with light-coupled isolation module input；Optical coupling module output end and secondary side voltage transformer
Output end is connected with signal acquiring system input, and the result collected is inputted host computer system by signal acquiring system output end
System, to the voltage and current signal extraction and analysis that collect and finally give the open circuit loss of power transformer and load damage
Consumption.
Primary side voltage transformer includes voltage transformer ptA, voltage transformer ptB, voltage transformer ptC, mutual induction of voltage
Device PTX, voltage transformer ptY, voltage transformer ptZ.Wherein, voltage transformer ptAInput and power transformer high-pressure side A
It is connected, voltage transformer ptBInput is connected with power transformer high-pressure side B phases, voltage transformer ptCInput and electric power
High voltage side of transformer C phases are connected, voltage transformer ptXInput is connected with low-tension side of power transformer A phases, voltage transformer ptY
Input is connected with low-tension side of power transformer B phases, voltage transformer ptZInput is connected with low-tension side of power transformer C phases.
Its function is ensures power transformer high-pressure side and low-pressure side voltage not less than primary side voltage transformer range, by it in proportion
Be converted to the voltage no more than secondary side voltage transformer range, and by this control source isolating transformer.
Primary side current transformer includes Current TransmitA, Current TransmitB, Current TransmitC, Current Mutual Inductance
Device CTX, current transformer includes CTY, current transformer includes CTZ.Wherein, Current TransmitAInput and power transformer
High-pressure side A phases are connected, Current TransmitBInput is connected with power transformer high-pressure side B phases, Current TransmitCInput
It is connected with power transformer high-pressure side C phases, Current TransmitXInput is connected with low-tension side of power transformer A phases, and electric current is mutual
Sensor CTYInput is connected with low-tension side of power transformer B phases, Current TransmitZInput and low-tension side of power transformer C
It is connected.Its function is to ensure that power transformer high-pressure side and low-pressure side electric current, will not less than primary side current transformer range
It is converted to the electric current no more than secondary side current transformer range in proportion, and this electric current is inputted into secondary side current mutual inductance
Device.
Isolating transformer includes isolating transformer ITA, isolating transformer ITB, isolating transformer ITC, isolating transformer ITX,
Isolating transformer ITY, isolating transformer ITZ.Wherein, isolating transformer ITAInput and voltage transformer ptAOutput end is connected
Connect, isolating transformer ITBInput and voltage transformer ptBOutput end is connected, isolating transformer ITCInput is mutual with voltage
Sensor PTCOutput end is connected, isolating transformer ITXInput and voltage transformer ptXOutput end is connected, isolating transformer
ITYInput and voltage transformer ptYOutput end is connected, isolating transformer ITZInput and voltage transformer ptZOutput end
It is connected.Its function be by power transformer High voltage output side and secondary side voltage transformer and secondary side current transformer every
From to prevent causing to damage to secondary side voltage transformer and current transformer.
Secondary side voltage transformer includes voltage transformer pta, voltage transformer ptb, voltage transformer ptc, mutual induction of voltage
Device PTx, voltage transformer pty, voltage transformer ptz.Wherein, voltage transformer ptaInput and isolating transformer ITAOutput end
It is connected, voltage transformer ptbInput and isolating transformer ITBOutput end is connected, voltage transformer ptcInput with every
From transformer ITCOutput end is connected, voltage transformer ptxInput and isolating transformer ITXOutput end is connected, and voltage is mutual
Sensor PTyInput and isolating transformer ITYOutput end is connected, voltage transformer ptzInput and isolating transformer ITZIt is defeated
Go out end to be connected.Its function is that the voltage that primary side voltage transformer exports is entered into line translation, can be by signal acquisition system
System collection.
Secondary side current transformer includes Current Transmita, Current Transmitb, Current Transmitc, Current Mutual Inductance
Device CTx, current transformer includes CTy, Current Transmitz.Wherein, Current TransmitaInput and Current TransmitAIt is defeated
Go out end to be connected, Current TransmitbInput and Current TransmitBOutput end is connected, Current TransmitcInput
With Current TransmitCOutput end is connected, Current TransmitxInput and Current TransmitXOutput end is connected, electricity
Current transformer CTyInput and Current TransmitYOutput end is connected, Current TransmitzInput and current transformer
CTZOutput end is connected.Its function is that the electric current that primary side current transformer exports is entered into line translation, enable current signal by
Signal acquiring system completes signal A/D collection conversion.
Light-coupled isolation module includes optical coupling isolation module OCa, optical coupler module OCb, optical coupler module OCc, optocoupler matched moulds
Block OCx, optical coupler module OCy, optical coupler module OCz.Wherein, optical coupler module OCaInput and Current TransmitaOutput end
It is connected, optical coupler module OCbInput and Current TransmitbOutput end is connected, optical coupler module OCcInput and electricity
Current transformer CTcOutput end is connected, optical coupler module OCxInput and Current TransmitxOutput end is connected, optical coupling
Module OCyInput and Current TransmityOutput end is connected, optical coupler module OCzInput and Current TransmitzIt is defeated
Go out end to be connected.Its function prevents from converting suddenly for secondary side current transformer output current is isolated with signal acquiring system
High current signal be coupled to signal acquiring system, analog input card is damaged.
Signal acquiring system includes voltage acquisition card and current acquisition card.Voltage acquisition card input respectively with mutual induction of voltage
Device PTa, voltage transformer ptb, voltage transformer ptc, voltage transformer ptx, voltage transformer pty, voltage transformer ptzOutput
End is connected；Current acquisition card input respectively with light-coupled isolation module OCa, light-coupled isolation module OCb, light-coupled isolation module OCc、
Light-coupled isolation module OCx, light-coupled isolation module OCy, light-coupled isolation module OCzOutput end is connected.Its function is that acquisition time has been pacified
The secondary side voltage transformer of dress and the output result of secondary side current transformer, the voltage of continuous transformation and current signal is real
When discrete acquisitions, and collection result is sent to master system.
Master system according to collect discrete voltage, current signal, according to predetermined open circuit loss and load loss
Computational methods, the open circuit loss and load loss of power transformer are calculated in real time.
Referring to Fig. 3 and Fig. 4, loss computing method is：
Due to detecting system in detection process respectively via primary side voltage transformer, primary side current transformer, secondary
Side voltage transformer and secondary side current transformer convert respectively to voltage and current, therefore finally enter the electricity of signal acquiring system
Certain deviation be present in pressure value and current value.Therefore, the present invention use the method for calibration curve with reduce this error band come influence.
I.e. before using this detecting system test power transformer open circuit loss and load loss, system is detected to this set using reference instrument
The voltage and current test result of system is demarcated and draws out voltage calibration curve fuWith calibration with current signal curve fi.If make respectively
The voltage signal sequence that this set system testing obtains is Ua, Ub, Uc, Ux, Uy, Uz, current signal sequence is Ia, Ib, Ic, Ix, Iy,
Iz.It is then f by voltage signal sequence variation using calibration curveu(Ua),fu(Ub),fu(Uc),fu(Ux),fu(Uy),fu(Uz)；Electricity
Stream signal sequence, which becomes, turns to fi(Ia), fi(Ib), fi(Ic), fi(Ix), fi(Iy), fi(Iz).For convenience of calculating, first by voltage and
Current signal according to the size that standard conversion is Yy0 type power transformer voltages and electric current, subsequent voltage and current sequence according to
It is perunit value that power transformer grade, which is directly converted,.If signal acquiring system gathers 12n point altogether in 0.02s, after conversion
Power transformer high-pressure side A phase perunit value voltage signal sequences fu’(Ua) be expressed as：
fu'(Ua)=[fu'(Ua0),fu'(Ua1),fu'(Ua2),…,fu'(Uai),…,fu'(Uan)]
Power transformer high-pressure side A phase current signal sequences are expressed as：
fi'(Ia)=[fi'(Ia0),fi'(Ia1),fi'(Ia2),…,fi'(Iai),…,fi'(Ian)]
The on high-tension side power of power transformer A phases is expressed as：
Power transformer high-pressure side B phases, C phases and low-tension side of power transformer X phases, Y phases, Z phases power can respectively according to
Above formula calculates.Then the loss power of power transformer is represented by：
PAlways=PA+PB+PC-PX-PY-PZ
The open circuit loss of power transformer is expressed as：
The load loss of power transformer is expressed as：
Claims (9)
1. a kind of electrification detection system of power transformer loss, it is characterised in that including primary side voltage transformer, primary side
Current transformer, isolating transformer, secondary side current transformer, secondary side voltage transformer, light-coupled isolation module, signal acquisition
System and master system；
Primary side voltage transformer input is connected respectively with power transformer high-pressure side and low-pressure side, the access isolation of its output end
Transformer；Primary side current transformer input is connected by jaw with power transformer high-pressure side and low pressure side ports, and its is defeated
Go out and terminate into secondary side current transformer；Isolating transformer output end is connected with secondary side voltage transformer input；Secondary side
Current transformer output end is connected with light-coupled isolation module input；Optical coupling module output end and the output of secondary side voltage transformer
End is connected with signal acquiring system input, signal acquiring system output end connection master system；
Master system is used for the voltage and current signal extraction and analysis that collect and the sky for finally giving power transformer
Load-loss and load loss.
A kind of 2. electrification detection system of power transformer loss according to claim 1, it is characterised in that primary side electricity
Pressure transformer includes voltage transformer ptA, voltage transformer ptB, voltage transformer ptC, voltage transformer ptX, voltage transformer
PTY, voltage transformer ptZ；Wherein, voltage transformer ptAInput is connected with power transformer high-pressure side A phases, voltage transformer
PTBInput is connected with power transformer high-pressure side B phases, voltage transformer ptCInput and power transformer high-pressure side C phase phases
Even, voltage transformer ptXInput is connected with low-tension side of power transformer A phases, voltage transformer ptYInput and power transformer
Device low-pressure side B phases are connected, voltage transformer ptZInput is connected with low-tension side of power transformer C phases；
Isolating transformer includes isolating transformer ITA, isolating transformer ITB, isolating transformer ITC, isolating transformer ITX, isolation
Transformer ITY, isolating transformer ITZ；Wherein, isolating transformer ITAInput and voltage transformer ptAOutput end is connected, every
From transformer ITBInput and voltage transformer ptBOutput end is connected, isolating transformer ITCInput and voltage transformer
PTCOutput end is connected, isolating transformer ITXInput and voltage transformer ptXOutput end is connected, isolating transformer ITYIt is defeated
Enter end and voltage transformer ptYOutput end is connected, isolating transformer ITZInput and voltage transformer ptZOutput end is connected
Connect；
Secondary side voltage transformer includes voltage transformer pta, voltage transformer ptb, voltage transformer ptc, voltage transformer
PTx, voltage transformer pty, voltage transformer ptz；Wherein, voltage transformer ptaInput and isolating transformer ITAOutput end phase
Connection, voltage transformer ptbInput and isolating transformer ITBOutput end is connected, voltage transformer ptcInput is with isolating
Transformer ITCOutput end is connected, voltage transformer ptxInput and isolating transformer ITXOutput end is connected, mutual induction of voltage
Device PTyInput and isolating transformer ITYOutput end is connected, voltage transformer ptzInput and isolating transformer ITZOutput
End is connected.
A kind of 3. electrification detection system of power transformer loss according to claim 2, it is characterised in that primary side electricity
Current transformer includes Current TransmitA, Current TransmitB, Current TransmitC, Current TransmitX, current transformer
Including CTY, current transformer includes CTZ；Wherein, Current TransmitAInput is connected with power transformer high-pressure side A phases, electricity
Current transformer CTBInput is connected with power transformer high-pressure side B phases, Current TransmitCInput and power transformer high pressure
Side C phases are connected, Current TransmitXInput is connected with low-tension side of power transformer A phases, Current TransmitYInput and electricity
Power step down side B phases are connected, Current TransmitZInput is connected with low-tension side of power transformer C phases；
Secondary side current transformer includes Current Transmita, Current Transmitb, Current Transmitc, current transformer
CTx, current transformer includes CTy, Current Transmitz；Wherein, Current TransmitaInput and Current TransmitAOutput
End is connected, Current TransmitbInput and Current TransmitBOutput end is connected, Current TransmitcInput with
Current TransmitCOutput end is connected, Current TransmitxInput and Current TransmitXOutput end is connected, electric current
Transformer CTyInput and Current TransmitYOutput end is connected, Current TransmitzInput and Current TransmitZ
Output end is connected；
Light-coupled isolation module includes optical coupling isolation module OCa, optical coupler module OCb, optical coupler module OCc, optical coupler module
OCx, optical coupler module OCy, optical coupler module OCz；Wherein, optical coupler module OCaInput and Current TransmitaOutput end phase
Connection, optical coupler module OCbInput and Current TransmitbOutput end is connected, optical coupler module OCcInput and electric current
Transformer CTcOutput end is connected, optical coupler module OCxInput and Current TransmitxOutput end is connected, optocoupler matched moulds
Block OCyInput and Current TransmityOutput end is connected, optical coupler module OCzInput and Current TransmitzOutput
End is connected.
A kind of 4. electrification detection system of power transformer loss according to claim 3, it is characterised in that signal acquisition
System includes voltage acquisition card and current acquisition card；Voltage acquisition card input respectively with voltage transformer pta, voltage transformer
PTb, voltage transformer ptc, voltage transformer ptx, voltage transformer pty, voltage transformer ptzOutput end is connected；Current acquisition
Card input respectively with light-coupled isolation module OCa, light-coupled isolation module OCb, light-coupled isolation module OCc, light-coupled isolation module OCx、
Light-coupled isolation module OCy, light-coupled isolation module OCzOutput end is connected；It is mounted secondary that signal acquiring system is used for acquisition time
The output result of side voltage transformer and secondary side current transformer, adopt the voltage of continuous transformation and current signal are discrete in real time
Collection, and collection result is sent to master system.
A kind of 5. electrification detection system of power transformer loss according to claim 4, it is characterised in that host computer system
System according to collect discrete voltage, current signal, according to predetermined open circuit loss and load loss computational methods, calculate in real time
The open circuit loss and load loss of power transformer；
The predetermined open circuit loss and load loss computational methods are：
Before the electrification detection system test power transformer open circuit loss and load loss of power transformer loss, mark is utilized
The voltage and current test result for the electrification detection system that power transformer is lost quasi- instrument is demarcated and draws out voltage
Calibration curve fuWith calibration with current signal curve fi；
If the voltage signal sequence that the electrification detection system for making power transformer be lost respectively is tested to obtain is Ua, Ub, Uc, Ux, Uy,
Uz, current signal sequence is Ia, Ib, Ic, Ix, Iy, Iz；It is then f by voltage signal sequence variation using calibration curveu(Ua),fu
(Ub),fu(Uc),fu(Ux),fu(Uy),fu(Uz)；Current signal sequence variation is fi(Ia), fi(Ib), fi(Ic), fi(Ix), fi
(Iy), fi(Iz)；Size first by voltage and current signal according to standard conversion for Yy0 type power transformer voltages and electric current,
It is perunit value that subsequent voltage and current sequence are directly converted according to power transformer grade；If signal acquiring system is in 0.02s
12n point is gathered altogether, then power transformer high-pressure side A phase perunit value voltage signal sequences f after convertingu’(Ua) be expressed as：
fu'(Ua)=[fu'(Ua0),fu'(Ua1),fu'(Ua2),…,fu'(Uai),…,fu'(Uan)]
Power transformer high-pressure side A phase current signal sequences are expressed as：
fi'(Ia)=[fi'(Ia0),fi'(Ia1),fi'(Ia2),…,fi'(Iai),…,fi'(Ian)]
The on high-tension side power of power transformer A phases is expressed as：
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Power transformer high-pressure side B phases, C phases and low-tension side of power transformer X phases, Y phases, the power of Z phases are respectively according to above formula meter
Calculate；The loss power of power transformer is expressed as：
PAlways=PA+PB+PC-PX-PY-PZ
The open circuit loss of power transformer is expressed as：
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The load loss of power transformer is expressed as：
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A kind of 6. live detection method of power transformer loss, it is characterised in that the band based on a kind of loss of power transformer
Electricity detecting system；It is mutual that the electrification detection system of the power transformer loss includes primary side voltage transformer, primary side current
Sensor, isolating transformer, secondary side current transformer, secondary side voltage transformer, light-coupled isolation module, signal acquiring system and
Master system；Primary side voltage transformer input is connected respectively with power transformer high-pressure side and low-pressure side, its output end
Access isolating transformer；Primary side current transformer input passes through jaw and power transformer high-pressure side and low pressure side ports phase
Connect, its output end access secondary side current transformer；Isolating transformer output end is connected with secondary side voltage transformer input；
Secondary side current transformer output end is connected with light-coupled isolation module input；Optical coupling module output end and secondary side mutual induction of voltage
Device output end is connected with signal acquiring system input, signal acquiring system output end connection master system；Master system
For the voltage to collecting and current signal extraction and analysis and finally give the open circuit loss of power transformer and load damage
Consumption；
The live detection method of the power transformer loss, comprises the following steps：Master system according to collect from
Voltage, current signal are dissipated, according to predetermined open circuit loss and load loss computational methods, the unloaded of power transformer is calculated in real time and damages
Consumption and load loss；
The predetermined open circuit loss and load loss computational methods are：
Before the electrification detection system test power transformer open circuit loss and load loss of power transformer loss, mark is utilized
The voltage and current test result for the electrification detection system that power transformer is lost quasi- instrument is demarcated and draws out voltage
Calibration curve fuWith calibration with current signal curve fi；
If the voltage signal sequence that the electrification detection system for making power transformer be lost respectively is tested to obtain is Ua, Ub, Uc, Ux, Uy,
Uz, current signal sequence is Ia, Ib, Ic, Ix, Iy, Iz；It is then f by voltage signal sequence variation using calibration curveu(Ua),fu
(Ub),fu(Uc),fu(Ux),fu(Uy),fu(Uz)；Current signal sequence variation is fi(Ia), fi(Ib), fi(Ic), fi(Ix), fi
(Iy), fi(Iz)；Size first by voltage and current signal according to standard conversion for Yy0 type power transformer voltages and electric current,
It is perunit value that subsequent voltage and current sequence are directly converted according to power transformer grade；If signal acquiring system is in 0.02s
12n point is gathered altogether, then power transformer high-pressure side A phase perunit value voltage signal sequences f after convertingu’(Ua) be expressed as：
fu'(Ua)=[fu'(Ua0),fu'(Ua1),fu'(Ua2),…,fu'(Uai),…,fu'(Uan)]
Power transformer high-pressure side A phase current signal sequences are expressed as：
fi'(Ia)=[fi'(Ia0),fi'(Ia1),fi'(Ia2),…,fi'(Iai),…,fi'(Ian)]
The on high-tension side power of power transformer A phases is expressed as：
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Calculate；The loss power of power transformer is expressed as：
PAlways=PA+PB+PC-PX-PY-PZ
The open circuit loss of power transformer is expressed as：
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The load loss of power transformer is expressed as：
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A kind of 7. live detection method of power transformer loss according to claim 6, it is characterised in that primary side electricity
Pressure transformer includes voltage transformer ptA, voltage transformer ptB, voltage transformer ptC, voltage transformer ptX, voltage transformer
PTY, voltage transformer ptZ；Wherein, voltage transformer ptAInput is connected with power transformer high-pressure side A phases, voltage transformer
PTBInput is connected with power transformer high-pressure side B phases, voltage transformer ptCInput and power transformer high-pressure side C phase phases
Even, voltage transformer ptXInput is connected with low-tension side of power transformer A phases, voltage transformer ptYInput and power transformer
Device low-pressure side B phases are connected, voltage transformer ptZInput is connected with low-tension side of power transformer C phases；
Isolating transformer includes isolating transformer ITA, isolating transformer ITB, isolating transformer ITC, isolating transformer ITX, isolation
Transformer ITY, isolating transformer ITZ；Wherein, isolating transformer ITAInput and voltage transformer ptAOutput end is connected, every
From transformer ITBInput and voltage transformer ptBOutput end is connected, isolating transformer ITCInput and voltage transformer
PTCOutput end is connected, isolating transformer ITXInput and voltage transformer ptXOutput end is connected, isolating transformer ITYIt is defeated
Enter end and voltage transformer ptYOutput end is connected, isolating transformer ITZInput and voltage transformer ptZOutput end is connected
Connect；
Secondary side voltage transformer includes voltage transformer pta, voltage transformer ptb, voltage transformer ptc, voltage transformer
PTx, voltage transformer pty, voltage transformer ptz；Wherein, voltage transformer ptaInput and isolating transformer ITAOutput end phase
Connection, voltage transformer ptbInput and isolating transformer ITBOutput end is connected, voltage transformer ptcInput is with isolating
Transformer ITCOutput end is connected, voltage transformer ptxInput and isolating transformer ITXOutput end is connected, mutual induction of voltage
Device PTyInput and isolating transformer ITYOutput end is connected, voltage transformer ptzInput and isolating transformer ITZOutput
End is connected.
A kind of 8. live detection method of power transformer loss according to claim 7, it is characterised in that primary side electricity
Current transformer includes Current TransmitA, Current TransmitB, Current TransmitC, Current TransmitX, current transformer
Including CTY, current transformer includes CTZ；Wherein, Current TransmitAInput is connected with power transformer high-pressure side A phases, electricity
Current transformer CTBInput is connected with power transformer high-pressure side B phases, Current TransmitCInput and power transformer high pressure
Side C phases are connected, Current TransmitXInput is connected with low-tension side of power transformer A phases, Current TransmitYInput and electricity
Power step down side B phases are connected, Current TransmitZInput is connected with low-tension side of power transformer C phases；
Secondary side current transformer includes Current Transmita, Current Transmitb, Current Transmitc, current transformer
CTx, current transformer includes CTy, Current Transmitz；Wherein, Current TransmitaInput and Current TransmitAOutput
End is connected, Current TransmitbInput and Current TransmitBOutput end is connected, Current TransmitcInput with
Current TransmitCOutput end is connected, Current TransmitxInput and Current TransmitXOutput end is connected, electric current
Transformer CTyInput and Current TransmitYOutput end is connected, Current TransmitzInput and Current TransmitZ
Output end is connected；
Light-coupled isolation module includes optical coupling isolation module OCa, optical coupler module OCb, optical coupler module OCc, optical coupler module
OCx, optical coupler module OCy, optical coupler module OCz；Wherein, optical coupler module OCaInput and Current TransmitaOutput end phase
Connection, optical coupler module OCbInput and Current TransmitbOutput end is connected, optical coupler module OCcInput and electric current
Transformer CTcOutput end is connected, optical coupler module OCxInput and Current TransmitxOutput end is connected, optocoupler matched moulds
Block OCyInput and Current TransmityOutput end is connected, optical coupler module OCzInput and Current TransmitzOutput
End is connected.
A kind of 9. live detection method of power transformer loss according to claim 8, it is characterised in that signal acquisition
System includes voltage acquisition card and current acquisition card；Voltage acquisition card input respectively with voltage transformer pta, voltage transformer
PTb, voltage transformer ptc, voltage transformer ptx, voltage transformer pty, voltage transformer ptzOutput end is connected；Current acquisition
Card input respectively with light-coupled isolation module OCa, light-coupled isolation module OCb, light-coupled isolation module OCc, light-coupled isolation module OCx、
Light-coupled isolation module OCy, light-coupled isolation module OCzOutput end is connected；It is mounted secondary that signal acquiring system is used for acquisition time
The output result of side voltage transformer and secondary side current transformer, adopt the voltage of continuous transformation and current signal are discrete in real time
Collection, and collection result is sent to master system.
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| CN113223832A (en) * | 2021-03-29 | 2021-08-06 | 佛山市兴智达电子有限公司 | Low-loss transformer and finished product detection method thereof |
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