CN109085430A - A kind of method and system being lost for monitoring power transformer on-line - Google Patents
A kind of method and system being lost for monitoring power transformer on-line Download PDFInfo
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- CN109085430A CN109085430A CN201810892456.1A CN201810892456A CN109085430A CN 109085430 A CN109085430 A CN 109085430A CN 201810892456 A CN201810892456 A CN 201810892456A CN 109085430 A CN109085430 A CN 109085430A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
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Abstract
The present invention relates to a kind of for monitoring the method and system of power transformer loss on-line, it include: in parallel with the input terminal of the equivalent two-port network of transformer using one virtual current source of current transformer construction, and the difference of the secondary side current of calculating current mutual inductor and transformer primary side current flows output power of the product of signal and transformer primary side voltage as virtual current source；It is in parallel with the output end of the equivalent two-port network of transformer that a virtual voltage source is constructed using voltage transformer, and calculates the output power of the secondary side voltage and the differential pressure signal of Circuit Fault on Secondary Transformer voltage and the product of Circuit Fault on Secondary Transformer electric current of voltage transformer as virtual voltage source；Utilize the loss of the power calculation transformer of the power and virtual voltage source in the virtual current source.The present invention provides guide for method for loss measurement of the power transformer under actual operating mode, breaches the limitation of power transformer loss measurement, ensure that the validity of power transformer loss measurement.
Description
Technical field
The present invention relates to high-voltage electrical equipment loss measurement technical fields, and more particularly, to one kind for online
The method and system of Monitoring Power Transformer loss.
Background technique
The loss measurement of traditional power transformer is divided into no-load loss measurement and load loss measurement, both losses
Measurement mainly carries out in laboratory, is to measure its loss under idle running test to no-load loss measurement, to load loss
Measurement is to measure its loss under short circuit operation test, and this traditional loss measurement method is estimated in the state of a certain single
Calculate the loss of transformer.However, transformer load condition in actual operation and operating condition be it is continually changing, therefore, pass
The loss measurement method of system has limitation.
Under the overall situation for carrying forward vigorously energy-saving and emission-reduction at present, loss of the transformer under whole service state is fully understood
Situation of change is necessary.The existing electrical quantity primary and secondary using measuring transformer is come calculating transformer loss
Mode it is more complicated in actual mechanical process, need equipment more, error is larger, be not suitable for on-line monitoring.
Therefore, it is necessary to a kind of methods of the loss on-line monitoring of power transformer.
Summary of the invention
The present invention proposes a kind of method and system being lost for monitoring power transformer on-line, how accurately to solve
The problem of loss of the power transformer under practical load carrying operating condition is monitored on-line.
To solve the above-mentioned problems, according to an aspect of the invention, there is provided it is a kind of for monitoring power transformer on-line
The method of device loss, which is characterized in that the described method includes:
It is in parallel with the input terminal of the equivalent two-port network of transformer using one virtual current source of current transformer construction,
And the secondary side current of calculating current mutual inductor and the difference of transformer primary side current flow signal and transformer primary side voltage
Output power of the product as virtual current source；Wherein, the virtual current source has predetermined current threshold；
It is in parallel with the output end of the equivalent two-port network of transformer using one virtual voltage source of voltage transformer construction,
And calculate the secondary side voltage of voltage transformer and the differential pressure signal of Circuit Fault on Secondary Transformer voltage and Circuit Fault on Secondary Transformer electric current
Output power of the product as virtual voltage source；Wherein, the virtual voltage source has predetermined voltage threshold；
Utilize the loss of the power calculation transformer of the power and virtual voltage source in the virtual current source.
Preferably, wherein described construct a virtual current source and the equivalent Two-port netwerk net of transformer using current transformer
The input terminal of network is in parallel, comprising:
The primary series connection of the Current Transmit 1 of transformer primary side accesses transformer primary side, Circuit Fault on Secondary Transformer electricity
The primary series connection of current transformer CT accesses Circuit Fault on Secondary Transformer, and Current Transmit 1 and the secondary side of Current Transmit are mutual
It connects, the current value i.e. size of current in virtual current source drawn in secondary side series connection.
Preferably, wherein described construct a virtual voltage source and the equivalent Two-port netwerk net of transformer using voltage transformer
The output end of network is in parallel, comprising:
The primary access transformer primary side in parallel of the voltage transformer VT of transformer primary side, the two of voltage transformer VT
Secondary side low pressure terminates to the common end n of Circuit Fault on Secondary Transformer, the secondary side high-voltage end and Circuit Fault on Secondary Transformer of voltage transformer VT
The differential pressure value of composition, that is, virtual voltage source voltage swing.
Preferably, wherein the power calculation transformer of the power and virtual voltage source using the virtual current source
Loss, comprising:
Ploss=PΔ-λ2PInput,
PΔ=v1(i1/k3-i2/k2)+i2(v1/k1-v2),
Wherein, PlossFor the loss of transformer；PΔFor the output power in virtual voltage source and the output work in virtual current source
The sum of rate；PInputFor the input power of transformer；v1For transformer primary side voltage, i2For Circuit Fault on Secondary Transformer electric current；k1For electricity
Press the no-load voltage ratio of mutual inductor；k2For the no-load voltage ratio of secondary side current mutual inductor；k3For the no-load voltage ratio of primary side current mutual inductor；ktFor transformation
The no-load voltage ratio of device.
According to another aspect of the present invention, a kind of system for monitoring power transformer loss on-line is provided,
It is characterized in that, the system comprises:
The output power in virtual current source calculates unit, for constructing a virtual current source using current transformer and becoming
The input terminal of the equivalent two-port network of depressor is in parallel, and the secondary side current of calculating current mutual inductor and transformer primary side electricity
The output power of the difference stream signal of stream and the product of transformer primary side voltage as virtual current source；Wherein, the virtual electricity
Stream source has predetermined current threshold；
The output power in virtual voltage source calculates unit, for constructing a virtual voltage source using voltage transformer and becoming
The output end of the equivalent two-port network of depressor is in parallel, and calculates the secondary side voltage and Circuit Fault on Secondary Transformer electricity of voltage transformer
The output power of the differential pressure signal of pressure and the product of Circuit Fault on Secondary Transformer electric current as virtual voltage source；Wherein, the virtual electricity
Potential source has predetermined voltage threshold；
The loss calculation unit of transformer, the power meter for power and virtual voltage source using the virtual current source
Calculate the loss of transformer.
Preferably, wherein the output power in the virtual current source calculates unit, a void is constructed using current transformer
Quasi- current source is in parallel with the input terminal of the equivalent two-port network of transformer, comprising:
The primary series connection of the Current Transmit 1 of transformer primary side accesses transformer primary side, Circuit Fault on Secondary Transformer electricity
The primary series connection of current transformer CT accesses Circuit Fault on Secondary Transformer, and Current Transmit 1 and the secondary side of Current Transmit are mutual
It connects, the current value i.e. size of current in virtual current source drawn in secondary side series connection.
Preferably, wherein the output power in the virtual voltage source calculates unit, a void is constructed using voltage transformer
Quasi- voltage source is in parallel with the output end of the equivalent two-port network of transformer, comprising:
The primary access transformer primary side in parallel of the voltage transformer VT of transformer primary side, the two of voltage transformer VT
Secondary side low pressure terminates to the common end n of Circuit Fault on Secondary Transformer, the secondary side high-voltage end and Circuit Fault on Secondary Transformer of voltage transformer VT
The differential pressure value of composition, that is, virtual voltage source voltage swing.
Preferably, wherein the loss calculation unit of the transformer, utilizes the power and virtual electricity in the virtual current source
The loss of the power calculation transformer of potential source, comprising:
Ploss=PΔ-λ2PInput,
PΔ=v1(i1/k3-i2/k2)+i2(v1/k1-v2),
Wherein, PlossFor the loss of transformer；PΔFor the output power in virtual voltage source and the output work in virtual current source
The sum of rate；PInputFor the input power of transformer；v1For transformer primary side voltage, i2For Circuit Fault on Secondary Transformer electric current；k1For electricity
Press the no-load voltage ratio of mutual inductor；k2For the no-load voltage ratio of secondary side current mutual inductor；k3For the no-load voltage ratio of primary side current mutual inductor；ktFor transformation
The no-load voltage ratio of device.
The present invention provides a kind of for monitoring the method and system of power transformer loss on-line, solves power transformer
The problem of loss on-line monitoring of the device under practical load carrying operating condition, by the power in equivalent virtual current source and equivalent
Virtual voltage source power calculation power transformer loss, in real time monitor on-line power transformer operating condition, this
The technical solution of invention provides guide for method for loss measurement of the power transformer under actual operating mode, breaches electric power
The limitation of transformer loss measurement, ensure that the validity of power transformer loss measurement.
Detailed description of the invention
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by:
Fig. 1 is the flow chart according to the method 100 for monitoring power transformer loss on-line of embodiment of the present invention；
Fig. 2 is the circuit diagram according to the power transformer loss measurement of embodiment of the present invention；
Fig. 3 is the wiring schematic diagram according to the power transformer loss measurement of embodiment of the present invention；And
Fig. 4 is to be shown according to the structure of the system 400 for monitoring power transformer loss on-line of embodiment of the present invention
It is intended to.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is the flow chart according to the method 100 for monitoring power transformer loss on-line of embodiment of the present invention.
As shown in Figure 1, the method for monitoring power transformer loss on-line that embodiments of the present invention provide, solves electric power change
It the problem of loss on-line monitoring of the depressor under practical load carrying operating condition, by the power in equivalent virtual current source and waits
The operating condition of power transformer is monitored in the loss of the power calculation power transformer in the virtual voltage source of effect on-line in real time.
The technical solution of embodiments of the present invention provides method for loss measurement of the power transformer under actual operating mode and refers to
It leads, breaches the limitation of power transformer loss measurement, ensure that the validity of power transformer loss measurement.Of the invention
The method 100 for monitoring power transformer loss on-line that embodiment provides is since step 101 place.Preferably, in step
Rapid 101 is in parallel with the input terminal of the equivalent two-port network of transformer using one virtual current source of current transformer construction, and
Secondary side current and the difference stream signal of transformer primary side current and the multiplying for transformer primary side voltage of calculating current mutual inductor
Output power of the product as virtual current source；Wherein, the virtual current source has predetermined current threshold.
Preferably, wherein described construct a virtual current source and the equivalent Two-port netwerk net of transformer using current transformer
The input terminal of network is in parallel, comprising:
The primary series connection of the Current Transmit 1 of transformer primary side accesses transformer primary side, Circuit Fault on Secondary Transformer electricity
The primary series connection of current transformer CT accesses Circuit Fault on Secondary Transformer, and Current Transmit 1 and the secondary side of Current Transmit are mutual
It connects, the current value i.e. size of current in virtual current source drawn in secondary side series connection.
Preferably, a virtual voltage source and the equivalent Two-port netwerk of transformer are constructed using voltage transformer in step 102
The output end of network is in parallel, and calculates differential pressure signal and the change of the secondary side voltage and Circuit Fault on Secondary Transformer voltage of voltage transformer
Output power of the product of depressor secondary side current as virtual voltage source；Wherein, the virtual voltage source has predeterminated voltage
Threshold value.
Preferably, wherein described construct a virtual voltage source and the equivalent Two-port netwerk net of transformer using voltage transformer
The output end of network is in parallel, comprising:
The primary access transformer primary side in parallel of the voltage transformer VT of transformer primary side, the two of voltage transformer VT
Secondary side low pressure terminates to the common end n of Circuit Fault on Secondary Transformer, the secondary side high-voltage end and Circuit Fault on Secondary Transformer of voltage transformer VT
The differential pressure value of composition, that is, virtual voltage source voltage swing.
Preferably, the power in the virtual current source and the power calculation transformer in virtual voltage source are utilized in step 103
Loss.
Preferably, wherein the power calculation transformer of the power and virtual voltage source using the virtual current source
Loss, comprising:
Ploss=PΔ-λ2PInput,
PΔ=v1(i1/k3-i2/k2)+i2(v1/k1-v2),
Wherein, PlossFor the loss of transformer；PΔFor the output power in virtual voltage source and the output work in virtual current source
The sum of rate；PInputFor the input power of transformer；v1For transformer primary side voltage, i2For Circuit Fault on Secondary Transformer electric current；k1For electricity
Press the no-load voltage ratio of mutual inductor；k2For the no-load voltage ratio of secondary side current mutual inductor；k3For the no-load voltage ratio of primary side current mutual inductor；ktFor transformation
The no-load voltage ratio of device.
Fig. 2 is the circuit diagram according to the power transformer loss measurement of embodiment of the present invention.As shown in Fig. 2, root
According to the principle of Circuit theory, transformer is equivalent to a two-port network.In the input of the equivalent two-port network of transformer
The virtual current source of an end upper specified current flow size in parallel, output end are connected the virtual voltage of a upper given voltage size
Source therefore deduces that the loss calculation principle of transformer.Assuming that can basis after having added virtual voltage source and virtual current source
The relationship of power obtains loss=transformer input power+virtual voltage source output power+virtual current source output of transformer
Power-transformer output power, the formula of transformer loss can be obtained according to this power relation, wherein PΔ=virtual electric
Potential source output power+virtual current source output power, first finds out this value, it is necessary to know difference stream i1/k3-i2/k2With differential pressure v1/
k1-v2The two parameters just need to construct differential pressure and difference stream by the wiring diagram of Fig. 3 to find out the two parameters, directly
It can be measured with table.
Fig. 3 is the wiring schematic diagram according to the power transformer loss measurement of embodiment of the present invention.As shown in figure 3, becoming
The primary series connection of the Current Transmit 1 of depressor primary side accesses transformer primary side, Circuit Fault on Secondary Transformer Current Transmit
Primary series connection access Circuit Fault on Secondary Transformer, Current Transmit 1 and the secondary side of Current Transmit be serially connected, secondary side
The current value drawn in the series connection i.e. size of current in virtual current source.The primary parallel connection of the voltage transformer VT of transformer primary side
Transformer primary side is accessed, the secondary side low pressure of voltage transformer VT terminates to the common end n of Circuit Fault on Secondary Transformer, mutual induction of voltage
Differential pressure value, that is, virtual voltage source voltage swing that the secondary side high-voltage end and Circuit Fault on Secondary Transformer of device VT is constituted.
When measuring the loss of power transformer, it is first determined Current Transformer Secondary side electric current and transformer primary side electricity
The product of the difference stream signal of stream, difference stream signal and transformer primary side voltage is exactly the power in virtual current source.Then, it is determined that
The differential pressure signal of voltage transformer secondary side voltage and Circuit Fault on Secondary Transformer voltage, the differential pressure signal and Circuit Fault on Secondary Transformer electric current
Product be virtual voltage source power.Finally, really according to the sum of the power in virtual current source and the power in virtual voltage source
Determine the loss of power transformer.
For Fig. 2, the power algebraical sum in virtual current source and virtual voltage source is P △:
PΔ=v1(i1/k3-i2/k2)+i2(v1/k1-v2),
Wherein, v1 is transformer primary side voltage, i2It is Circuit Fault on Secondary Transformer electric current, i1/k3-i2/k2It is that difference stream is washed,
v1/k1-v2It is differential pressure signal.
Corresponding diagram 3 is are as follows:
Wherein:
Therefore, the loss calculation of transformer such as following formula:
Ploss=PΔ-λ2PInput,
Wherein, PlossFor the loss of transformer；PΔFor the output power in virtual voltage source and the output work in virtual current source
The sum of rate；PInputFor the input power of transformer；v1It is Circuit Fault on Secondary Transformer electric current for transformer primary side voltage, i2；k1For electricity
Press the no-load voltage ratio of mutual inductor；k2For the no-load voltage ratio of secondary side current mutual inductor；k3For the no-load voltage ratio of primary side current mutual inductor；ktFor transformation
The no-load voltage ratio of device.
Fig. 4 is to be shown according to the structure of the system 400 for monitoring power transformer loss on-line of embodiment of the present invention
It is intended to.As shown in figure 4, the system 400 being lost for monitoring power transformer on-line that embodiments of the present invention provide, packet
Include: the output power in virtual current source calculates unit 401, the output power calculating unit 402 in virtual voltage source and transformer
Loss calculation unit 403.Preferably, the output power in the virtual current source calculates unit 401, for utilizing current transformer
It is in parallel with the input terminal of the equivalent two-port network of transformer to construct a virtual current source, and calculating current mutual inductor is secondary
The difference of side electric current and transformer primary side current flows signal with the product of transformer primary side voltage as the defeated of virtual current source
Power out；Wherein, the virtual current source has predetermined current threshold.
Preferably, wherein the output power in the virtual current source calculates unit 401, one is constructed using current transformer
Virtual current source is in parallel with the input terminal of the equivalent two-port network of transformer, comprising: the current transformer of transformer primary side
The primary series connection of CT1 accesses transformer primary side, and the primary series connection of Circuit Fault on Secondary Transformer Current Transmit accesses transformer two
Secondary side, Current Transmit 1 and the secondary side of Current Transmit are serially connected, and the current value drawn in secondary side series connection is i.e. empty
The size of current of quasi- current source.
Preferably, the output power in the virtual voltage source calculates unit 402, for constructing one using voltage transformer
Virtual voltage source is in parallel with the output end of the equivalent two-port network of transformer, and calculate voltage transformer secondary side voltage and
The output power of the differential pressure signal of Circuit Fault on Secondary Transformer voltage and the product of Circuit Fault on Secondary Transformer electric current as virtual voltage source；Its
In, the virtual voltage source has predetermined voltage threshold.
Preferably, wherein the output power in the virtual voltage source calculates unit 402, one is constructed using voltage transformer
Virtual voltage source is in parallel with the output end of the equivalent two-port network of transformer, comprising: the voltage transformer of transformer primary side
The primary access transformer primary side in parallel of VT, the secondary side low pressure of voltage transformer VT terminate to the public of Circuit Fault on Secondary Transformer
N is held, differential pressure value, that is, virtual voltage source voltage that secondary side high-voltage end and the Circuit Fault on Secondary Transformer of voltage transformer VT is constituted is big
It is small.
Preferably, the loss calculation unit 403 of the transformer, for the power using the virtual current source and virtually
The loss of the power calculation transformer of voltage source.
Preferably, wherein the loss calculation unit 103 of the transformer, the power in the virtual current source and virtual is utilized
The loss of the power calculation transformer of voltage source, comprising:
Ploss=PΔ-λ2PInput,
PΔ=v1(i1/k3-i2/k2)+i2(v1/k1-v2),
Wherein, PlossFor the loss of transformer；PΔFor the output power in virtual voltage source and the output work in virtual current source
The sum of rate；PInputFor the input power of transformer；v1For transformer primary side voltage, i2For Circuit Fault on Secondary Transformer electric current；k1For electricity
Press the no-load voltage ratio of mutual inductor；k2For the no-load voltage ratio of secondary side current mutual inductor；k3For the no-load voltage ratio of primary side current mutual inductor；ktFor transformation
The no-load voltage ratio of device.
The system 400 and another reality of the invention for being used to monitor on-line power transformer loss of the embodiment of the present invention
The method 100 for monitoring power transformer loss on-line for applying example is corresponding, and details are not described herein.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
Defined by subsidiary Patent right requirement, in addition to the present invention other embodiments disclosed above equally fall in it is of the invention
In range.
Normally, all terms used in the claims are all solved according to them in the common meaning of technical field
It releases, unless in addition clearly being defined wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate sequence, unless explicitly stated otherwise.
Claims (8)
1. a kind of method for monitoring power transformer loss on-line, which is characterized in that the described method includes:
It is in parallel with the input terminal of the equivalent two-port network of transformer that a virtual current source is constructed using current transformer, and is counted
Calculate the product of the secondary side current of current transformer and difference the stream signal and transformer primary side voltage of transformer primary side current
Output power as virtual current source；Wherein, the virtual current source has predetermined current threshold；
It is in parallel with the output end of the equivalent two-port network of transformer that a virtual voltage source is constructed using voltage transformer, and is counted
Calculate the product of the secondary side voltage of voltage transformer and the differential pressure signal of Circuit Fault on Secondary Transformer voltage and Circuit Fault on Secondary Transformer electric current
Output power as virtual voltage source；Wherein, the virtual voltage source has predetermined voltage threshold；
Utilize the loss of the power calculation transformer of the power and virtual voltage source in the virtual current source.
2. the method according to claim 1, wherein described construct a virtual current source using current transformer
It is in parallel with the input terminal of the equivalent two-port network of transformer, comprising:
The primary series connection of the Current Transmit 1 of transformer primary side accesses transformer primary side, and Circuit Fault on Secondary Transformer electric current is mutual
The primary series connection of sensor CT accesses Circuit Fault on Secondary Transformer, and Current Transmit 1 and the secondary side of Current Transmit are serially connected,
The current value i.e. size of current in virtual current source drawn in secondary side series connection.
3. the method according to claim 1, wherein described construct a virtual voltage source using voltage transformer
It is in parallel with the output end of the equivalent two-port network of transformer, comprising:
The primary access transformer primary side in parallel of the voltage transformer VT of transformer primary side, the secondary side of voltage transformer VT
Low pressure terminates to the common end n of Circuit Fault on Secondary Transformer, and the secondary side high-voltage end and Circuit Fault on Secondary Transformer of voltage transformer VT is constituted
Differential pressure value, that is, virtual voltage source voltage swing.
4. the method according to claim 1, wherein the power using the virtual current source and virtual electricity
The loss of the power calculation transformer of potential source, comprising:
Ploss=PΔ-λ2PInput,
PΔ=v1(i1/k3-i2/k2)+i2(v1/k1-v2),
Wherein, PlossFor the loss of transformer；PΔFor virtual voltage source output power and virtual current source output power it
With；PInputFor the input power of transformer；v1For transformer primary side voltage, i2For Circuit Fault on Secondary Transformer electric current；k1It is mutual for voltage
The no-load voltage ratio of sensor；k2For the no-load voltage ratio of secondary side current mutual inductor；k3For the no-load voltage ratio of primary side current mutual inductor；ktFor transformer
No-load voltage ratio.
5. a kind of system for monitoring power transformer loss on-line, which is characterized in that the system comprises:
The output power in virtual current source calculates unit, for constructing a virtual current source and transformer using current transformer
The input terminal of equivalent two-port network is in parallel, and the secondary side current of calculating current mutual inductor and transformer primary side current
Output power of the product of difference stream signal and transformer primary side voltage as virtual current source；Wherein, the virtual current source
With predetermined current threshold；
The output power in virtual voltage source calculates unit, for constructing a virtual voltage source and transformer using voltage transformer
The output end of equivalent two-port network is in parallel, and calculates the secondary side voltage and Circuit Fault on Secondary Transformer voltage of voltage transformer
Output power of the product of differential pressure signal and Circuit Fault on Secondary Transformer electric current as virtual voltage source；Wherein, the virtual voltage source
With predetermined voltage threshold；
The loss calculation unit of transformer, the power calculation for power and virtual voltage source using the virtual current source become
The loss of depressor.
6. system according to claim 5, which is characterized in that the output power in the virtual current source calculates unit, benefit
It is in parallel with the input terminal of the equivalent two-port network of transformer that Current Transformer constructs a virtual current source, comprising:
The primary series connection of the Current Transmit 1 of transformer primary side accesses transformer primary side, and Circuit Fault on Secondary Transformer electric current is mutual
The primary series connection of sensor CT accesses Circuit Fault on Secondary Transformer, and Current Transmit 1 and the secondary side of Current Transmit are serially connected,
The current value i.e. size of current in virtual current source drawn in secondary side series connection.
7. system according to claim 5, which is characterized in that the output power in the virtual voltage source calculates unit, benefit
It is in parallel with the output end of the equivalent two-port network of transformer that a virtual voltage source is constructed with voltage transformer, comprising:
The primary access transformer primary side in parallel of the voltage transformer VT of transformer primary side, the secondary side of voltage transformer VT
Low pressure terminates to the common end n of Circuit Fault on Secondary Transformer, and the secondary side high-voltage end and Circuit Fault on Secondary Transformer of voltage transformer VT is constituted
Differential pressure value, that is, virtual voltage source voltage swing.
8. system according to claim 5, which is characterized in that the loss calculation unit of the transformer utilizes the void
The loss of the power calculation transformer of the power and virtual voltage source of quasi- current source, comprising:
Ploss=PΔ-λ2PInput,
PΔ=v1(i1/k3-i2/k2)+i2(v1/k1-v2),
Wherein, PlossFor the loss of transformer；PΔFor virtual voltage source output power and virtual current source output power it
With；PInputFor the input power of transformer；v1For transformer primary side voltage, i2For Circuit Fault on Secondary Transformer electric current；k1It is mutual for voltage
The no-load voltage ratio of sensor；k2For the no-load voltage ratio of secondary side current mutual inductor；k3For the no-load voltage ratio of primary side current mutual inductor；ktFor transformer
No-load voltage ratio.
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| CN201811996U (en) * | 2010-01-22 | 2011-04-27 | 福建星网锐捷网络有限公司 | System for testing performance of network isolating transformer |
| CN105182126A (en) * | 2015-09-08 | 2015-12-23 | 中国电力科学研究院 | Improved distribution transformer energy efficiency measuring detection method |
| CN107066755A (en) * | 2017-04-28 | 2017-08-18 | 国家电网公司 | The emulated computation method of transformer loss under a kind of harmonic current |
| CN107958125A (en) * | 2017-12-12 | 2018-04-24 | 中国电力科学研究院有限公司 | Low frequency model modeling method and system in a kind of three-phase transformer electro-magnetic transient |
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Application publication date: 20181225 |