CN106707028A - Transformer short-circuit impedance on-line monitoring method and device - Google Patents
Transformer short-circuit impedance on-line monitoring method and device Download PDFInfo
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- CN106707028A CN106707028A CN201611254305.0A CN201611254305A CN106707028A CN 106707028 A CN106707028 A CN 106707028A CN 201611254305 A CN201611254305 A CN 201611254305A CN 106707028 A CN106707028 A CN 106707028A
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- G—PHYSICS
- 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
- G01R27/08—Measuring resistance by measuring both voltage and current
Abstract
The present invention provides a transformer short-circuit impedance on-line monitoring method and device. The method comprises: collecting the current signals and the voltage signals of the high-voltage side and the low-voltage side of the transformer; determining the fundamental wave vector values of the high-voltage side and the low-voltage side of the transformer according to the collected current signals and the voltage signals of the high-voltage side and the low-voltage side of the transformer; sending the determined fundamental wave vector values of the high-voltage side and the low-voltage side of the transformer to an upper computer; and determining the short-circuit impedance value of the transformer through the upper computer according to the fundamental wave vector values of the high-voltage side and the low-voltage side of the transformer. therefore, the transformer is not needed to quit the operation, the online monitoring of the short-circuit impedance of the transformer. Because the electric signal collection device sends the determined fundamental wave vector values of the high-voltage side and the low-voltage side of the transformer to the upper computer, the method and device provided by the invention can save the communication time, have the timeliness, and can actually and accurately monitor the short-circuit impedance condition of the transformer. The present invention further provides a transformer short-circuit impedance on-line monitoring method and device having the same effect.
Description
Technical field
The present invention relates to transformer fault identification technology field, more particularly to a kind of Transformer Short Circuit Impedance on-line monitoring side
Method and device.
Background technology
Transformer (Transformer) is the device for changing alternating voltage using the principle of electromagnetic induction, main member
It is primary coil, secondary coil and iron core (magnetic core).Major function has：It is voltage transformation, current transformation, impedance conversion, isolation, steady
Pressure (magnetic saturation transformer) etc..Can be divided into, according to use,：Power transformer and special transformer (electric furnace change, rectification change, power frequency examination
Test transformer, pressure regulator, mining change, audio-frequency transformer, intermediate-frequency transformer, high frequency transformer, impact transformer, instrument transformation
Device, electronic transformer, reactor, transformer etc.).Transformer as one of topmost equipment in power system, in power train
Occupy highly important status in system, the normal work of power system will be influenceed when transformer breaks down, cause power supply
Nervous problem.
Transformer Winding is that transformer breaks down one of more part, and change can be reacted by Transformer Short Circuit Impedance
Depressor failure situation.The monitoring method of current Transformer Short Circuit Impedance includes short circuit impedance method, frequency response method etc., these
Method is still in the off-line monitoring stage, and can not realize on-line monitoring.Because offline monitoring method needs transformer to exit fortune
OK, it is impossible to reflect transformer state in real time, it is impossible to the true, situation of monitor Transformer Short Circuit Impedance.
The content of the invention
Based on this, it is necessary to provide it is a kind of being capable of the true, transformer of monitor Transformer Short Circuit Impedance situation in fact
Short-circuit impedance on-line monitoring method and device.
A kind of Transformer Short Circuit Impedance on-line monitoring method, including：
Collection high voltage side of transformer, the current signal and voltage signal of low-pressure side；
The high voltage side of transformer, the current signal of low-pressure side and voltage signal according to collection determine that the transformer is high
Pressure side, the fundamental wave vector value of low-pressure side；
The fundamental wave vector value of the high voltage side of transformer for determining, low-pressure side is sent to host computer；By host computer according to
The high voltage side of transformer, the fundamental wave vector value of low-pressure side determine the short-circuit impedance value of the transformer.
A kind of Transformer Short Circuit Impedance on-Line Monitor Device, including：At current acquisition equipment, voltage acquisition equipment, data
Reason device and collection communication module；
The current acquisition equipment, the current signal for gathering high voltage side of transformer, low-pressure side；
The voltage acquisition equipment, the current signal voltage signal for gathering high voltage side of transformer, low-pressure side；
The data processor, for the high voltage side of transformer, the current signal and voltage of low-pressure side according to collection
Signal determines the fundamental wave vector value of the high voltage side of transformer, low-pressure side；
The collection communication module, the fundamental wave vector value transmission of the high voltage side of transformer, low-pressure side for that will determine
To host computer；The short circuit of the transformer is determined according to the fundamental wave vector value of the high voltage side of transformer, low-pressure side by host computer
Impedance value.
Above-mentioned Transformer Short Circuit Impedance on-line monitoring method and device, collection high voltage side of transformer, the electric current letter of low-pressure side
Number and voltage signal；High voltage side of transformer, the current signal of low-pressure side and voltage signal according to collection determine transformer high-voltage
Side, the fundamental wave vector value of low-pressure side；The fundamental wave vector value of the high voltage side of transformer of determination, low-pressure side is sent to host computer；By
Host computer determines the short-circuit impedance value of transformer according to the fundamental wave vector value of high voltage side of transformer, low-pressure side.In this way, without transformation
Device is out of service, can realize the on-line monitoring of Transformer Short Circuit Impedance.Meanwhile, and because electrical signal collection device will need not be adopted
The high voltage side of transformer of collection, the current signal of low-pressure side and voltage signal are sent to host computer, but the transformer that will be determined
High-pressure side, the fundamental wave vector value of low-pressure side are sent to host computer, therefore, the method and device can save call duration time, have more
Real-time, can truly, monitor Transformer Short Circuit Impedance situation.
A kind of Transformer Short Circuit Impedance on-line monitoring method, including：
Receive high voltage side of transformer, the fundamental wave vector value of low-pressure side that electrical signal collection device sends；The transformer is high
Pressure side, the fundamental wave vector value of low-pressure side are the electrical signal collection device collection high voltage side of transformer, the current signal of low-pressure side
After voltage signal, what the high voltage side of transformer, the current signal of low-pressure side and voltage signal according to collection determined；
Fundamental wave vector value according to the high voltage side of transformer, low-pressure side determines the short-circuit impedance value of the transformer.
A kind of Transformer Short Circuit Impedance on-Line Monitor Device, it is characterised in that including：Upper communication module and processor；
The upper communication module, for receive electrical signal collection device transmission high voltage side of transformer, low-pressure side base
Wave direction value；The high voltage side of transformer, the fundamental wave vector value of low-pressure side are that the electrical signal collection device collection transformer is high
After pressure side, the current signal of low-pressure side and voltage signal, the current signal of the high voltage side of transformer, low-pressure side according to collection
With voltage signal determination；
The processor, described in being determined according to the high voltage side of transformer, the fundamental wave vector value of low-pressure side that receive
The short-circuit impedance value of transformer.
Above-mentioned Transformer Short Circuit Impedance on-line monitoring method and device, the transformer for receiving electrical signal collection device transmission are high
Pressure side, the fundamental wave vector value of low-pressure side；The high voltage side of transformer, the fundamental wave vector value of low-pressure side are the electrical signal collection dresses
It is the high voltage side of transformer according to collection, low after putting collection high voltage side of transformer, the current signal of low-pressure side and voltage signal
Press current signal and the voltage signal determination of side；High voltage side of transformer, the fundamental wave vector value of low-pressure side according to receiving determine
The short-circuit impedance value of transformer.In this way, it is out of service without transformer, the on-line monitoring of Transformer Short Circuit Impedance can be realized.
Meanwhile, and due to host computer need not receive electrical signal collection device collection high voltage side of transformer, the current signal of low-pressure side and
Voltage signal, but high voltage side of transformer, the fundamental wave vector value of low-pressure side that electrical signal collection device is determined are received, therefore,
The method and device can save call duration time, more real-time, can truly, monitor Transformer Short Circuit Impedance feelings
Condition.
Brief description of the drawings
Fig. 1 is the flow of the Transformer Short Circuit Impedance on-line monitoring method of the embodiment for running on electrical signal collection device
Figure；
Fig. 2 is the working environment schematic diagram of the Transformer Short Circuit Impedance on-line monitoring method of an embodiment；
Fig. 3 is a particular flow sheet for step of the Transformer Short Circuit Impedance on-line monitoring method of Fig. 1；
Fig. 4 is the flow chart of the Transformer Short Circuit Impedance on-line monitoring method of the embodiment for running on host computer；
Fig. 5 is one particular flow sheet of step of Transformer Short Circuit Impedance on-line monitoring method of Fig. 4；
Fig. 6 is a T-shaped equivalent circuit for the two-winding transformer of specific embodiment；
Fig. 7 is the structure chart of the Transformer Short Circuit Impedance on-Line Monitor Device of one embodiment；
Fig. 8 is second structure chart of the Transformer Short Circuit Impedance on-Line Monitor Device of embodiment；
Fig. 9 is the 3rd structure chart of the Transformer Short Circuit Impedance on-Line Monitor Device of embodiment.
Specific embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give preferred embodiment of the invention.But, the present invention can be realized in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose for providing these embodiments is to make the understanding to the disclosure more saturating
It is thorough comprehensive.
Unless otherwise defined, all of technologies and scientific terms used here by the article with belong to technical field of the invention
The implication that technical staff is generally understood that is identical.The term for being used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein " and/or " include one or more phases
The arbitrary and all of combination of the Listed Items of pass.
As shown in figure 1, the Transformer Short Circuit Impedance on-line monitoring method of one embodiment of the invention, runs on electrical signal collection
On device, including：
S110：Collection high voltage side of transformer, the current signal and voltage signal of low-pressure side.
Electrical signal collection device can include current acquisition equipment and voltage acquisition equipment.Current acquisition equipment gathers transformation
Device high-pressure side, the current signal of low-pressure side.Specifically, voltage acquisition equipment collection high voltage side of transformer, low-pressure side voltage signal.
Current signal can include A phase current signals, B phase current signals, C phase current signals；Voltage signal can be believed including A phase voltages
Number, B phase voltage signals, C phase voltage signals.
Specifically, the current signal and voltage signal of electrical signal collection device Real-time Collection high voltage side of transformer, low-pressure side.
S130：High voltage side of transformer, the current signal of low-pressure side and voltage signal according to collection determine transformer high-voltage
Side, the fundamental wave vector value of low-pressure side.
Electrical signal collection device also includes data processor.High voltage side of transformer, low pressure of the data processor according to collection
The current signal and voltage signal of side determine the fundamental wave vector value of high voltage side of transformer, low-pressure side.Fundamental wave vector value includes electric current
Fundamental wave vector value and voltage fundamental vector value.Data processor can be DSP (Digital Signal Processing, numeral
Signal transacting) signal processor.I.e. electrical signal collection device is true according to the high voltage side of transformer, the current signal of low-pressure side for gathering
Determine the current first harmonics vector value of high voltage side of transformer, low-pressure side；High voltage side of transformer, low of the electrical signal collection device according to collection
The voltage signal of pressure side determines the voltage fundamental vector value of high voltage side of transformer, low-pressure side.Specifically, current first harmonics vector value and
Voltage fundamental vector value includes amplitude and phase.
Specifically, electrical signal collection device high voltage side of transformer, the current signal and electricity of low-pressure side in real time according to collection
Pressure signal determines the fundamental wave vector value of high voltage side of transformer, low-pressure side.
S150：The fundamental wave vector value of the high voltage side of transformer of determination, low-pressure side is sent to host computer；By host computer according to
The high voltage side of transformer, the fundamental wave vector value of low-pressure side determine the short-circuit impedance value of the transformer.
Electrical signal collection device includes collection communication module.High voltage side of transformer, low pressure that collection communication module will determine
The fundamental wave vector value of side is sent to host computer.Specifically, electrical signal collection device will determine in real time high voltage side of transformer, low pressure
The fundamental wave vector value of side is sent to host computer.
Wherein in one embodiment, as shown in Fig. 2 host computer passes through RS232 with electrical signal collection device
(Recommended Standard232, asynchronous transmission standard interface proposed standard 232) is communicated to connect.
Above-mentioned Transformer Short Circuit Impedance on-line monitoring method, collection high voltage side of transformer, the current signal and electricity of low-pressure side
Pressure signal；High voltage side of transformer, the current signal of low-pressure side and voltage signal according to collection determine high voltage side of transformer, low pressure
The fundamental wave vector value of side；The fundamental wave vector value of the high voltage side of transformer of determination, low-pressure side is sent to host computer；By host computer root
The short-circuit impedance value of transformer is determined according to the fundamental wave vector value of high voltage side of transformer, low-pressure side.In this way, exiting fortune without transformer
OK, the on-line monitoring of Transformer Short Circuit Impedance can be realized.Meanwhile, and due to electrical signal collection device without will gather transformation
Device high-pressure side, the current signal of low-pressure side and voltage signal are sent to host computer, but the high voltage side of transformer, low that will be determined
Press side fundamental wave vector value send to host computer, therefore, the method can save call duration time, more real-time, can truly,
Monitor Transformer Short Circuit Impedance situation.
Fig. 3 is referred to, wherein in one embodiment, the current signal of high voltage side of transformer, low-pressure side according to collection
The step of determining the fundamental wave vector value of high voltage side of transformer, low-pressure side with voltage signal, including：
S331：High voltage side of transformer, the current signal of low-pressure side and voltage signal to gathering carry out signal enhanced processing.
S333：Signal is carried out to the high voltage side of transformer after enhanced processing, the current signal of low-pressure side and voltage signal to turn
Change.
S335：High voltage side of transformer, the current signal of low-pressure side and voltage signal after being changed to signal determine transformer
High-pressure side, the fundamental wave vector value of low-pressure side.
It should be noted that signal is converted to analog-to-digital conversion, data signal is converted analog signals into.In this way, to that will become
Depressor high-pressure side, the current signal of low-pressure side and voltage signal are amplified treatment again by high-pressure side, the current signal of low-pressure side
Analog signal with voltage signal changes into data signal, so that convenient treatment.
Wherein in one embodiment, to improve the accuracy of monitoring, high voltage side of transformer, low pressure after being changed to signal
The step of current signal and voltage signal of side determine the fundamental wave vector value of high voltage side of transformer, low-pressure side, including：
(a), signal is changed after high voltage side of transformer, the current signal of low-pressure side and voltage signal carry out optocoupler every
From.Specifically, light-coupled isolation can be isolated for high speed photo coupling.
B (), the high voltage side of transformer according to after light-coupled isolation, the current signal of low-pressure side and voltage signal determine transformer
High-pressure side, the fundamental wave vector value of low-pressure side.
Wherein in one embodiment, in order to improve the real-time of monitoring, to the high voltage side of transformer after enhanced processing, low
The step of pressing the current signal and voltage signal of side and carry out signal and change, including：
A (), the high voltage side of transformer to after enhanced processing, the current signal of low-pressure side and/or voltage signal carry out zero passage
Detection obtains testing result；
(b), actual acquisition frequency is determined according to testing result；
(c), according to actual acquisition frequency to the high voltage side of transformer after enhanced processing, the current signal of low-pressure side and voltage
Signal carries out signal conversion.
Wherein in a specific embodiment, in order to further improve the accuracy of monitoring, to the transformation after enhanced processing
The step of device high-pressure side, the current signal of low-pressure side and/or voltage signal carry out zero passage detection and obtain testing result, including：It is right
The current signal and/or voltage signal of high voltage side of transformer, low-pressure side after enhanced processing carry out zero passage detection and are initially tied
Really；Light-coupled isolation is carried out to initial results, testing result is obtained.So, it is to avoid signal is disturbed, the standard of actual acquisition frequency is improved
True property, so as to improve the accuracy of monitoring.
Wherein in one embodiment, the current signal and voltage signal of high voltage side of transformer include six road signals, respectively
It is high voltage side of transformer A phase current signals, B phase current signals, C phase current signals, and high voltage side of transformer A phase voltages letter
Number, B phase voltage signals, C phase voltage signals.The current signal and voltage signal of step down side are believed including corresponding six road
Number.In order to avoid the phase offset introduced by multi pass acquisition, so that, the accuracy of monitoring is improved, step S110 can be, synchronous
Gather the current signal and voltage signal of each road high voltage side of transformer, low-pressure side.
Fig. 4 is referred to, the present invention also provides a kind of transformer short-circuit with above-mentioned operation and electrical signal collection device and hinders
Anti- on-line monitoring method, corresponding Transformer Short Circuit Impedance on-line monitoring method, runs on host computer, including：
S470：Receive high voltage side of transformer, the fundamental wave vector value of low-pressure side that electrical signal collection device sends.The transformation
Device high-pressure side, the fundamental wave vector value of low-pressure side are the electrical signal collection device collection high voltage side of transformer, the electric current of low-pressure side
After signal and voltage signal, what the high voltage side of transformer, the current signal of low-pressure side and voltage signal according to collection determined.
Host computer includes upper communication module.Upper communication module coordinates with collection communication module realizes that electrical signal collection is filled
Put the communication between host computer.Upper communication module receives high voltage side of transformer, the low-pressure side that electrical signal collection device sends
Fundamental wave vector value.Specifically, collection communication module and upper communication module can be communication chip.
Specifically, host computer real-time reception electrical signal collection device send high voltage side of transformer, low-pressure side fundamental wave to
Value.
S490：High voltage side of transformer, the fundamental wave vector value of low-pressure side according to receiving determine the short-circuit impedance value of transformer.
Host computer also includes processor.Processor is true according to the high voltage side of transformer, the fundamental wave vector value of low-pressure side for receiving
Determine the short-circuit impedance value of transformer.
Specifically, host computer determines transformer according to the high voltage side of transformer, the fundamental wave vector value of low-pressure side for receiving in real time
Short-circuit impedance value.
Above-mentioned Transformer Short Circuit Impedance on-line monitoring method, the high voltage side of transformer of reception electrical signal collection device transmission,
The fundamental wave vector value of low-pressure side；The high voltage side of transformer, the fundamental wave vector value of low-pressure side are that the electrical signal collection device is adopted
After collection high voltage side of transformer, the current signal of low-pressure side and voltage signal, according to the high voltage side of transformer, the low-pressure side of collection
Current signal and voltage signal determine；High voltage side of transformer, the fundamental wave vector value of low-pressure side according to receiving determine transformation
The short-circuit impedance value of device.In this way, it is out of service without transformer, the on-line monitoring of Transformer Short Circuit Impedance can be realized.Meanwhile,
High voltage side of transformer, the current signal of low-pressure side and the voltage letter of electrical signal collection device collection need not be received due to host computer again
Number, but high voltage side of transformer, the fundamental wave vector value of low-pressure side that electrical signal collection device is determined are received, therefore, the method
Can save call duration time, more real-time, can truly, monitor Transformer Short Circuit Impedance situation.
Fig. 5 is referred to, to provide a kind of mode of the short-circuit impedance value for determining transformer, wherein in one embodiment,
The step of high voltage side of transformer, the fundamental wave vector value of low-pressure side according to receiving determine the short-circuit impedance value of transformer, including：
S591：Fundamental wave vector value according to the step down side for receiving determines conversion on high-tension side conversion fundamental wave vector
Value.
Conversion fundamental wave vector value arrives on high-tension side for current first harmonics vector value and voltage fundamental the vector value conversion of low-pressure side
Value, including reduced current fundamental wave vector value and reduced voltage fundamental wave vector value.The processor of host computer can be according to the change for receiving
The fundamental wave vector value of depressor low-pressure side determines conversion on high-tension side conversion fundamental wave vector value using traditional approach.
S593：According to conversion fundamental wave vector value and the fundamental wave vector value of high voltage side of transformer, the short circuit resistance of transformer is determined
Anti- value.
The processor of host computer can be according to conversion fundamental wave vector value and the fundamental wave vector value of high voltage side of transformer, using biography
System mode determines the short-circuit impedance value of transformer.
Further, according to conversion fundamental wave vector value and the fundamental wave vector value of high voltage side of transformer, the short of transformer is determined
The step of road impedance value, including：
(a), opening relationships model.
The processor of host computer sets up the relation mould on conversion fundamental wave vector value, the fundamental wave vector value of high voltage side of transformer
Type.Relational model can be the T-shaped Equivalent Model of two-winding transformer.Specifically, the T-shaped equivalent circuit of two-winding transformer,
As shown in Figure 6.Now, relational model can be：Wherein,It is the voltage base of high side voltage
Wave direction value；It is on high-tension side current first harmonics vector value；It is that on high-tension side voltage fundamental vector value is arrived in low-pressure side conversion,
That is reduced voltage fundamental wave vector value；For low-pressure side conversion on high-tension side current first harmonics vector value, i.e. reduced current fundamental wave to
Value；Z1It is the impedance value of high-pressure side winding；Z12It is the impedance value of low-pressure side conversion to high-pressure side winding；Wherein, Z1、Z12For not
The amount of knowing, the short-circuit impedance value of transformer is Z1+Z12。
(b), transformer is determined according to conversion fundamental wave vector value, the fundamental wave vector value of high voltage side of transformer and relational model
Short-circuit impedance value.
The processor of host computer can be according to conversion fundamental wave vector value, the fundamental wave vector value of high voltage side of transformer and relation mould
Type determines the short-circuit impedance value of transformer.
In power network, due to electric current as the change of load changes at any time, using the sampling under any two groups different electric currents
Value (including current transformer high-pressure side, low-pressure side current signal and information of voltage), in host computer according to the step down side for receiving
Fundamental wave vector value determine conversion to it is on high-tension side conversion fundamental wave vector value on the basis of, can just be built according to above-mentioned relation model
2 equations are found, so as to solve Z1、Z12, and then determine the short-circuit impedance value Z of transformer1+Z12。
Further, electrical signal collection device is disturbed when actual field is gathered due to existing, and sampled data can be caused to have
Certain error, the error calculated using two groups of sampled values is larger.In a preferred embodiment, according to electricity in a period of time
High voltage side of transformer, the current signal and voltage signal of low-pressure side of signal pickup assembly collection, in host computer according to reception
The fundamental wave vector value of step down side determines that conversion is arrived on the basis of on high-tension side conversion fundamental wave vector value, using genetic algorithm
The short-circuit impedance value of calculating transformer.I.e. host computer according to conversion fundamental wave vector value, the fundamental wave vector value of high voltage side of transformer and
The step of relational model determines the short-circuit impedance value of transformer is that host computer is according to conversion fundamental wave vector value, high voltage side of transformer
Fundamental wave vector value and relational model, the short-circuit impedance value of transformer is determined using genetic algorithm.So as to, reduce error, enter one
Step improves the accuracy of monitoring.
Fig. 7 is referred to, the present invention also provides a kind of transformation corresponding with above-mentioned Transformer Short Circuit Impedance on-line monitoring method
Device short-circuit impedance on-Line Monitor Device, as electrical signal collection device.Transformer Short Circuit Impedance on-Line Monitor Device includes：Electric current
Collecting device 711, voltage acquisition equipment 713, data processor 715 and collection communication module 717；
Current acquisition equipment 711, the current signal for gathering high voltage side of transformer, low-pressure side；
Voltage acquisition equipment 713, the current signal voltage signal for gathering high voltage side of transformer, low-pressure side；
Data processor 715, it is true for the high voltage side of transformer according to collection, the current signal of low-pressure side and voltage signal
Determine the fundamental wave vector value of high voltage side of transformer, low-pressure side；
Collection communication module 717, for the fundamental wave vector value of the high voltage side of transformer of determination, low-pressure side to be sent to upper
Machine；The short-circuit impedance value of the transformer is determined according to the fundamental wave vector value of the high voltage side of transformer, low-pressure side by host computer.
Above-mentioned Transformer Short Circuit Impedance on-Line Monitor Device, current acquisition equipment 711 and the collection of voltage acquisition equipment 713 become
Depressor high-pressure side, the current signal and voltage signal of low-pressure side；Transformer high-voltage of the data signal processor 715 according to collection
Side, the current signal of low-pressure side and voltage signal determine the fundamental wave vector value of high voltage side of transformer, low-pressure side；Collection communication module
717 send to host computer the fundamental wave vector value of the high voltage side of transformer of determination, low-pressure side；By host computer according to transformer high-voltage
Side, the fundamental wave vector value of low-pressure side determine the short-circuit impedance value of transformer.In this way, it is out of service without transformer, can realize
The on-line monitoring of Transformer Short Circuit Impedance.Meanwhile, and due to electrical signal collection device 710 without will gather transformer high-voltage
Side, the current signal of low-pressure side and voltage signal sent to host computer, but high voltage side of transformer, the low-pressure side that will be determined
Fundamental wave vector value is sent to host computer, therefore, the device can save call duration time, more real-time, can truly, exactly
Monitoring Transformer Short Circuit Impedance situation.
Wherein in one embodiment, the current signal and voltage signal of high voltage side of transformer include six road signals, respectively
It is high voltage side of transformer A phase current signals, B phase current signals, C phase current signals, and high voltage side of transformer A phase voltages letter
Number, B phase voltage signals, C phase voltage signals；The current signal and voltage signal of step down side are believed including corresponding six road
Number；Each road high voltage side of transformer of the synchronous acquisition of current acquisition equipment 711, the current signal of low-pressure side；Voltage acquisition equipment 713 is same
Each road high voltage side of transformer of step collection, the voltage signal of low-pressure side.
Fig. 8 is referred to, wherein in one embodiment, Transformer Short Circuit Impedance on-Line Monitor Device also includes amplifier
812 and analog-digital converter 814；
Amplifier 812, signal is carried out for the high voltage side of transformer to gathering, the current signal of low-pressure side and voltage signal
Enhanced processing；
Analog-digital converter 814, for believing the high voltage side of transformer after enhanced processing, the current signal of low-pressure side and voltage
Number carry out signal conversion；
Data processor 815, for being changed to signal after high voltage side of transformer, the current signal of low-pressure side and voltage letter
Number determine high voltage side of transformer, the fundamental wave vector value of low-pressure side.
Wherein in one embodiment, Transformer Short Circuit Impedance on-Line Monitor Device also includes optical coupling isolator 816；
Optical coupling isolator 816, for being changed to signal after high voltage side of transformer, the current signal of low-pressure side and voltage letter
Number carry out light-coupled isolation；
Data processor 815, for according to the high voltage side of transformer after light-coupled isolation, the current signal of low-pressure side and voltage
Signal determines the fundamental wave vector value of high voltage side of transformer, low-pressure side.
Wherein in one embodiment, electrical signal collection device also includes zero cross detection circuit 818；
Zero cross detection circuit 818, for the high voltage side of transformer after enhanced processing, the current signal of low-pressure side and/or
Voltage signal carries out zero passage detection and obtains testing result；
Data processor 815, is additionally operable to determine actual acquisition frequency according to testing result；
Analog-digital converter 814, is additionally operable to according to actual acquisition frequency to the high voltage side of transformer after enhanced processing, low-pressure side
Current signal and voltage signal carry out signal conversion.
Fig. 9 is referred to, the present invention also provides a kind of transformation corresponding with above-mentioned Transformer Short Circuit Impedance on-line monitoring method
Device short-circuit impedance on-Line Monitor Device, as host computer.Transformer Short Circuit Impedance on-Line Monitor Device includes：Upper communication module
927 and processor 929；
Upper communication module 927, for receive electrical signal collection device transmission high voltage side of transformer, low-pressure side fundamental wave
Vector value；The high voltage side of transformer, the fundamental wave vector value of low-pressure side are the electrical signal collection device collection transformer high-voltages
After side, the current signal of low-pressure side and voltage signal, according to collection the high voltage side of transformer, the current signal of low-pressure side and
What voltage signal determined；
Processor 929, for determining the short of transformer according to the high voltage side of transformer, the fundamental wave vector value of low-pressure side that receive
Road impedance value.
Above-mentioned Transformer Short Circuit Impedance on-Line Monitor Device, upper communication module 927 receives electrical signal collection device and sends
High voltage side of transformer, the fundamental wave vector value of low-pressure side；The high voltage side of transformer, the fundamental wave vector value of low-pressure side are the electricity
After signal pickup assembly collection high voltage side of transformer, the current signal of low-pressure side and voltage signal, according to the transformation of collection
What device high-pressure side, the current signal of low-pressure side and voltage signal determined；Processor 929 is according to the high voltage side of transformer, low for receiving
The fundamental wave vector value of pressure side determines the short-circuit impedance value of transformer.In this way, it is out of service without transformer, transformer can be realized
The on-line monitoring of short-circuit impedance.Meanwhile, and the high voltage side of transformer, low of electrical signal collection device collection need not be received by host computer
The current signal and voltage signal of side are pressed, but receives high voltage side of transformer, low-pressure side that electrical signal collection device is determined
Fundamental wave vector value, therefore, the device can save call duration time, more real-time, can truly, monitor transformer it is short
Road impedance conditions.
Wherein in one embodiment, processor 929 is true for the fundamental wave vector value according to the step down side for receiving
Fixed conversion converts fundamental wave vector value on high-tension side；And according to the fundamental wave vector of conversion fundamental wave vector value and high voltage side of transformer
Value, determines the short-circuit impedance value of transformer.
Wherein in one embodiment, processor 929 is true for the fundamental wave vector value according to the step down side for receiving
Fixed conversion converts fundamental wave vector value on high-tension side；Opening relationships model；According to conversion fundamental wave vector value, high voltage side of transformer
Fundamental wave vector value and relational model determine the short-circuit impedance value of transformer.
The above-mentioned Transformer Short Circuit Impedance on-Line Monitor Device for running on different terminals and the above-mentioned different terminals that run on
Transformer Short Circuit Impedance on-line monitoring method correspondence, therefore, for identical details technical characteristic, do not repeat herein.
Above example only expresses several embodiments of the invention, and its description is more specific and detailed, but can not
Therefore it is interpreted as the limitation to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art,
Without departing from the inventive concept of the premise, multiple deformations can also be made and is improved, these belong to protection model of the invention
Enclose.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of Transformer Short Circuit Impedance on-line monitoring method, it is characterised in that including：
Collection high voltage side of transformer, the current signal and voltage signal of low-pressure side；
The high voltage side of transformer, the current signal of low-pressure side and voltage signal according to collection determine the transformer high-voltage
Side, the fundamental wave vector value of low-pressure side；
The fundamental wave vector value of the high voltage side of transformer for determining, low-pressure side is sent to host computer；By host computer according to
High voltage side of transformer, the fundamental wave vector value of low-pressure side determine the short-circuit impedance value of the transformer.
2. Transformer Short Circuit Impedance on-line monitoring method according to claim 1, it is characterised in that described according to collection
The high voltage side of transformer, the current signal of low-pressure side and voltage signal determine the fundamental wave of the high voltage side of transformer, low-pressure side
The step of vector value, including：
The high voltage side of transformer, the current signal of low-pressure side and voltage signal to gathering carry out signal enhanced processing；
The high voltage side of transformer, the current signal of low-pressure side and voltage signal after to enhanced processing carry out signal conversion；
The high voltage side of transformer, the current signal of low-pressure side and voltage signal after being changed to signal determine that the transformer is high
Pressure side, the fundamental wave vector value of low-pressure side.
3. Transformer Short Circuit Impedance on-line monitoring method according to claim 2, it is characterised in that described to be changed to signal
The rear high voltage side of transformer, the current signal of low-pressure side and voltage signal determine the high voltage side of transformer, low-pressure side
The step of fundamental wave vector value, including：
The high voltage side of transformer, the current signal of low-pressure side and voltage signal after being changed to signal carry out light-coupled isolation；
The high voltage side of transformer, the current signal of low-pressure side and voltage signal after according to light-coupled isolation determine the transformer
High-pressure side, the fundamental wave vector value of low-pressure side.
4. Transformer Short Circuit Impedance on-line monitoring method according to claim 2, it is characterised in that described to enhanced processing
The rear high voltage side of transformer, the current signal of low-pressure side and voltage signal carry out signal the step of change, including：
The high voltage side of transformer, the current signal of low-pressure side and/or voltage signal after to enhanced processing carry out zero passage detection
Obtain testing result；
Actual acquisition frequency is determined according to the testing result；
According to the actual acquisition frequency to enhanced processing after the high voltage side of transformer, the current signal and voltage of low-pressure side
Signal carries out signal conversion.
5. the Transformer Short Circuit Impedance on-line monitoring method according to claim 1-4 any one, it is characterised in that described
The current signal and voltage signal of high voltage side of transformer include six road signals, respectively high voltage side of transformer A phase current signals, B
Phase current signal, C phase current signals, and high voltage side of transformer A phase voltage signals, B phase voltage signals, C phase voltage signals；Institute
The current signal and voltage signal for stating step down side include corresponding six road signal；
It is described collection high voltage side of transformer, the current signal and voltage signal of low-pressure side the step of be, each road transformation of synchronous acquisition
Device high-pressure side, the current signal and voltage signal of low-pressure side.
6. a kind of Transformer Short Circuit Impedance on-line monitoring method, it is characterised in that including：
Receive high voltage side of transformer, the fundamental wave vector value of low-pressure side that electrical signal collection device sends；The high voltage side of transformer,
The fundamental wave vector value of low-pressure side is the electrical signal collection device collection high voltage side of transformer, the current signal and voltage of low-pressure side
After signal, what the high voltage side of transformer, the current signal of low-pressure side and voltage signal according to collection determined；
Fundamental wave vector value according to the high voltage side of transformer, low-pressure side determines the short-circuit impedance value of the transformer.
7. Transformer Short Circuit Impedance on-line monitoring method according to claim 1, it is characterised in that described according to receiving
The step of high voltage side of transformer, the fundamental wave vector value of low-pressure side determine the short-circuit impedance value of the transformer, including：
Fundamental wave vector value according to the step down side for receiving determines conversion on high-tension side conversion fundamental wave vector value；
According to the conversion fundamental wave vector value and the fundamental wave vector value of the high voltage side of transformer, the short circuit of the transformer is determined
Impedance value.
8. Transformer Short Circuit Impedance on-line monitoring method according to claim 7, it is characterised in that described according to the folding
The fundamental wave vector value of fundamental wave vector value and the high voltage side of transformer is calculated, the step of determine the short-circuit impedance value of the transformer,
Including：
Opening relationships model；
According to the conversion fundamental wave vector value, the fundamental wave vector value of the high voltage side of transformer and the relational model determine
The short-circuit impedance value of transformer.
9. a kind of Transformer Short Circuit Impedance on-Line Monitor Device, it is characterised in that including：Current acquisition equipment, voltage acquisition set
Standby, data processor and collection communication module；
The current acquisition equipment, the current signal for gathering high voltage side of transformer, low-pressure side；
The voltage acquisition equipment, the current signal voltage signal for gathering high voltage side of transformer, low-pressure side；
The data processor, for the high voltage side of transformer, the current signal and voltage signal of low-pressure side according to collection
Determine the fundamental wave vector value of the high voltage side of transformer, low-pressure side；
The collection communication module, the fundamental wave vector value transmission of the high voltage side of transformer, low-pressure side for that will determine is supreme
Position machine；The short-circuit impedance of the transformer is determined according to the fundamental wave vector value of the high voltage side of transformer, low-pressure side by host computer
Value.
10. a kind of Transformer Short Circuit Impedance on-Line Monitor Device, it is characterised in that including：Upper communication module and processor；
The upper communication module, for receive electrical signal collection device transmission high voltage side of transformer, low-pressure side fundamental wave to
Value；The high voltage side of transformer, the fundamental wave vector value of low-pressure side be electrical signal collection device collection high voltage side of transformer,
After the current signal and voltage signal of low-pressure side, the current signal and electricity of the high voltage side of transformer, low-pressure side according to collection
Pressure signal determines；
The processor, for determining the transformation according to the high voltage side of transformer, the fundamental wave vector value of low-pressure side that receive
The short-circuit impedance value of device.
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| CN113659571A (en) * | 2021-08-13 | 2021-11-16 | 云南电网有限责任公司电力科学研究院 | Prediction device and method for predicting short-circuit current of power grid in-operation transformer in real time |
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