CN106918796A - A kind of secondary loop of mutual inductor impedance on-line detecting system and method - Google Patents
A kind of secondary loop of mutual inductor impedance on-line detecting system and method Download PDFInfo
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- CN106918796A CN106918796A CN201710287660.6A CN201710287660A CN106918796A CN 106918796 A CN106918796 A CN 106918796A CN 201710287660 A CN201710287660 A CN 201710287660A CN 106918796 A CN106918796 A CN 106918796A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention discloses a kind of secondary loop of mutual inductor impedance on-line detecting system, including：Signal generating unit, for producing sine voltage signal；Sine voltage signal injection unit, for receiving sine voltage signal and being injected into the secondary loop of mutual inductor；High-frequency current signal coupling unit, coupled voltages signal is obtained for being coupled with current transformer；Amplitude com parison unit, for the amplitude of the coupled voltages signal to be compared with the detection threshold value scope of lock phase amplifying unit, and the comparative result is sent to server；Lock phase amplifying unit, for according to the sine voltage signal and the coupled voltages signal of change quadrature component and in-phase component and transmission to server；And server, the amplitude of the sine voltage signal for being occurred to signal generating unit according to the comparative result is adjusted；The impedance of the quadrature component and in-phase component calculating current transformer secondary circuit that are calculated according to the sine voltage signal after adjustment.
Description
Technical field
The present invention relates to the impedance detection field of current transformer, and more particularly, to a kind of current transformer two
Minor loop impedance on-line detecting system and method.
Background technology
It is numerous currently for secondary loop of mutual inductor Failure Mode Analysis and the technical method species of stealing state recognition
Many, many in these technical methods be analyzed by the use of the impedance of secondary circuit as characteristic quantity.To secondary circuit
Impedance carry out qualitative analysis, the not impedance to secondary circuit carries out quantitative calculating, causes some special situations, such as
No-load voltage ratio is 2000：5 big resistive transformer cannot be distinguished by its normal connection and open-circuit condition, and no-load voltage ratio is 50：5 small impedance
Current transformer cannot be distinguished by its normal connection and short-circuit condition, cause be current transformer winding failure, Abnormal Insulation
Reliable directly data supporting is provided etc. fault diagnosis.
Therefore, it is a problem for being badly in need of solving that on-line checking how is carried out to secondary loop of mutual inductor impedance.
The content of the invention
The invention provides a kind of secondary loop of mutual inductor impedance on-line detecting system and method, to solve to electric current
Transformer secondary circuit impedance carries out the problem of on-line checking.
In order to solve the above problems, an a kind of invention of the invention, there is provided secondary loop of mutual inductor resistance
Anti- on-line detecting system, the system includes：Signal generating unit, sine voltage signal injection unit, high-frequency current signal coupling
Unit, signal amplitude comparing unit, lock phase amplifying unit and server are closed,
The signal generating unit, input respectively with the sine voltage signal injection unit, lock-in amplifier list
The input of unit is connected with the output end of server, for producing sine voltage signal, and the sine voltage signal is sent out
Deliver to sine voltage signal injection unit and lock phase amplifying unit；
The sine voltage signal injection unit, is connected with secondary loop of mutual inductor, for receiving the sine
Voltage signal is simultaneously injected into the secondary loop of mutual inductor；
The high-frequency current signal coupling unit, compares single with the secondary loop of mutual inductor, signal amplitude respectively
The input of unit is connected with the input of lock phase amplifying unit, and coupling is obtained for being coupled with the secondary loop of mutual inductor
Voltage signal is closed, and the coupled voltages signal is respectively sent to signal amplitude comparing unit and lock phase amplifying unit；
The amplitude com parison unit, is connected with the server, for by the amplitude of the coupled voltages signal with lock
The detection threshold value scope of phase amplifying unit is compared, and produces comparative result, and the comparative result is sent to server；
The lock phase amplifying unit, respectively with the output of the high-frequency current signal coupling unit and signal generating unit
End, and the input of server is connected, for according to the sine voltage signal and the coupled voltages signal of change just
Component and in-phase component are handed over, and the quadrature component and in-phase component are sent to server；And
The server, the amplitude of the sine voltage signal for being occurred to signal generating unit according to the comparative result
It is adjusted；According to quadrature component and same phase that the sine voltage signal after adjustment and corresponding coupled voltages signal of change are obtained
The impedance of component calculating current transformer secondary circuit.
Preferably, wherein the lock phase amplifying unit includes：Pre-amplifying module, bandpass filtering modules block, trigger module,
90 ° of phase shift modules, coherent detection module and low-pass filtering modules.
Preferably, wherein the sine voltage signal that is occurred to signal generating unit according to the comparative result of the server
Amplitude be adjusted, including：
If comparative result is the amplitude of the coupled voltages signal changes the signal in the range of the detection threshold value, not
The amplitude of the sine voltage signal that generating unit occurs；
If comparative result is the upper limit of the amplitude more than the detection threshold value scope of the coupled voltages signal, according to default
Adjustment amplitude thresholds reduce the amplitude of the sine voltage signal that the signal generating unit occurs, until after comparative result is for adjustment
The corresponding coupled voltages signal of sine voltage signal amplitude in the range of the detection threshold value；
If comparative result is the lower limit of the amplitude less than the detection threshold value scope of the coupled voltages signal, according to pre-
If adjustment amplitude thresholds increase the amplitude of the sine voltage signal that the signal generating unit occurs, until comparative result is adjustment
The amplitude of the corresponding coupled voltages signal of sine voltage signal afterwards is in the range of the detection threshold value.
Preferably, wherein the server is according to the sine voltage signal after adjustment and corresponding coupled voltages signal of change
The impedance of the quadrature component and in-phase component calculating current transformer secondary circuit that obtain, including：
Wherein, Z is the impedance of secondary loop of mutual inductor, U0It is the sine voltage signal of injection, n0For sinusoidal voltage is believed
The number of turn of number injection unit, n2For the number of turn of high-frequency current signal coupling unit, R are that high-frequency current signal coupling unit is sampled electricity
Resistance, x is the in-phase component for locking the output of phase amplifying unit, and y is the quadrature component for locking the output of phase amplifying unit.
According to another aspect of the present invention, there is provided a kind of secondary loop of mutual inductor impedance online test method,
Methods described includes：
Sine voltage signal is injected to current transformer；
Calculate the amplitude of the coupled voltages signal obtained by secondary loop of mutual inductor coupling；
By the amplitude of the coupled voltages signal with lock phase amplifying unit detection threshold value scope be compared, producing ratio compared with
As a result, and according to the comparative result amplitude of the sine voltage signal of the injection is adjusted；
According to sine voltage signal and the corresponding coupled voltages signal of change quadrature component injected after adjustment with mutually dividing
Amount；And
It is secondary according to the sine voltage signal, quadrature component and in-phase component calculating current transformer injected after the adjustment
The impedance in loop.
Preferably, wherein the amplitude by the coupled voltages signal is entered with the detection threshold value scope of lock phase amplifying unit
Row compares, and produces comparative result, and the amplitude of the sine voltage signal of the injection is adjusted according to the comparative result,
Including：
If comparative result is the amplitude of the coupled voltages signal changes the signal in the range of the detection threshold value, not
The amplitude of the sine voltage signal that generating unit occurs；
If comparative result is the upper limit of the amplitude more than the detection threshold value scope of the coupled voltages signal, according to default
Adjustment amplitude thresholds reduce the amplitude of the sine voltage signal that the signal generating unit occurs, until after comparative result is for adjustment
The corresponding coupled voltages signal of sine voltage signal amplitude in the range of the detection threshold value；
If comparative result is the lower limit of the amplitude less than the detection threshold value scope of the coupled voltages signal, according to pre-
If adjustment amplitude thresholds increase the amplitude of the sine voltage signal that the signal generating unit occurs, until comparative result is adjustment
The amplitude of the corresponding coupled voltages signal of sine voltage signal afterwards is in the range of the detection threshold value.
Preferably, wherein described according to the sine voltage signal injected after the adjustment, quadrature component and in-phase component meter
The impedance of secondary loop of mutual inductor is calculated, including：
Wherein, Z is the impedance of secondary loop of mutual inductor, U0It is the sine voltage signal of injection, n0For sinusoidal voltage is believed
The number of turn of number injection unit, n2For the number of turn of high-frequency current signal coupling unit, R are that high-frequency current signal coupling unit is sampled electricity
Resistance, x is the in-phase component for locking the output of phase amplifying unit, and y is the quadrature component for locking the output of phase amplifying unit.
The beneficial effects of the present invention are：
The lock phase amplifying unit of technical scheme is using the sine voltage signal and corresponding coupled voltages for injecting
Signal output obtains quadrature component and in-phase component, and sine voltage signal according to the injection, quadrature component with mutually dividing
Amount is calculated secondary loop of mutual inductor impedance, and can effectively solve existing big resistive transformer secondary circuit cannot
Normal connection status and open-circuit condition are distinguished, small resistive transformer secondary circuit cannot be distinguished by short-circuit condition and normal connection
The situation of state, for the fault diagnosises such as current transformer winding failure, Abnormal Insulation provide reliable directly data supporting.
Brief description of the drawings
By reference to the following drawings, illustrative embodiments of the invention can be more fully understood by：
Fig. 1 is the signal of the secondary loop of mutual inductor impedance on-line detecting system 100 according to embodiment of the present invention
Figure；
Fig. 2 is the schematic diagram of the lock phase amplifying unit according to embodiment of the present invention；
Fig. 3 is the equivalent circuit diagram of secondary loop of mutual inductor；And
Fig. 4 is the flow of the secondary loop of mutual inductor impedance online test method 400 according to embodiment of the present invention
Figure.
Specific embodiment
With reference now to accompanying drawing, illustrative embodiments of the invention are introduced, however, the present invention can use many different shapes
Formula is implemented, and is not limited to embodiment described herein, there is provided these embodiments are to disclose at large and fully
The present invention, and fully pass on the scope of the present invention to person of ordinary skill in the field.For showing for being illustrated in the accompanying drawings
Term in example property implementation method is not limitation of the invention.In the accompanying drawings, identical cells/elements are attached using identical
Icon is remembered.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has to person of ordinary skill in the field
It is common to understand implication.Further it will be understood that the term limited with usually used dictionary, is appreciated that and it
The linguistic context of association area has consistent implication, and is not construed as Utopian or excessively formal meaning.
Fig. 1 is the signal of the secondary loop of mutual inductor impedance on-line detecting system 100 according to embodiment of the present invention
Figure.As shown in figure 1, the secondary loop of mutual inductor impedance on-line detecting system 100 is used to return Current Transformer Secondary
Roadlock is anti-to carry out on-line checking, and the secondary loop of mutual inductor impedance on-line detecting system 100 includes：Signal generating unit
101st, sine voltage signal injection unit 102, high-frequency current signal coupling unit 103, signal amplitude comparing unit 104, lock phase
Amplifying unit 105 and server 106.Existing big resistance can effectively be solved by the detection to secondary loop of mutual inductor impedance
Anti-current transformer (such as no-load voltage ratio 2000：5) secondary circuit cannot be distinguished by normal connection status and open-circuit condition, and small resistive is mutual
Sensor (such as no-load voltage ratio 50：5) secondary circuit cannot be distinguished by the situation of short-circuit condition and normal connection status, while being also Current Mutual Inductance
The fault diagnosises such as device winding failure, Abnormal Insulation provide reliable directly data supporting.
Preferably, the signal generating unit 101, respectively with the input of the sine voltage signal injection unit
End, the input of lock-in amplifier unit are connected with the output end of server, for producing sine voltage signal, and will be described
Sine voltage signal is sent to sine voltage signal injection unit and lock phase amplifying unit.
Preferably, the sine voltage signal injection unit 102, is connected, with secondary loop of mutual inductor for connecing
Receive the sine voltage signal and be injected into the secondary loop of mutual inductor.
Preferably, the high-frequency current signal coupling unit 103, respectively with the secondary loop of mutual inductor, signal
The input of amplitude com parison unit with lock phase amplifying unit input be connected, for the secondary loop of mutual inductor
Couple and obtain coupled voltages signal, and the coupled voltages signal is respectively sent to signal amplitude comparing unit and mutually amplify with lock
Unit.
Preferably, the amplitude com parison unit 104, is connected with the server, for by the coupled voltages signal
Amplitude with lock phase amplifying unit detection threshold value scope be compared, produce comparative result, and by the comparative result send
To server.
Preferably, the lock phase amplifying unit 105, occurs single with the high-frequency current signal coupling unit and signal respectively
The output end of unit, and the input of server is connected, for being believed according to the sine voltage signal and the coupled voltages
Number quadrature component and in-phase component are calculated, and the quadrature component and in-phase component are sent to server.Fig. 2 is according to this hair
The schematic diagram of the lock phase amplifying unit of bright implementation method.As shown in Fig. 2 the lock phase amplifying unit includes：Pre-amplifying module,
Bandpass filtering modules block, trigger module, 90 ° of phase shift modules, coherent detection module and low-pass filtering modules.
Preferably, the server 106, for the sinusoidal voltage occurred to signal generating unit according to the comparative result
The amplitude of signal is adjusted；And obtained according to the sine voltage signal after adjustment and corresponding coupled voltages signal of change
The impedance of quadrature component and in-phase component calculating current transformer secondary circuit.Preferably, wherein the server is according to
The amplitude of the sine voltage signal that comparative result occurs to signal generating unit is adjusted, including：
If comparative result is the amplitude of the coupled voltages signal changes the signal in the range of the detection threshold value, not
The amplitude of the sine voltage signal that generating unit occurs；
If comparative result is the upper limit of the amplitude more than the detection threshold value scope of the coupled voltages signal, according to default
Adjustment amplitude thresholds reduce the amplitude of the sine voltage signal that the signal generating unit occurs, until after comparative result is for adjustment
The corresponding coupled voltages signal of sine voltage signal amplitude in the range of the detection threshold value；
If comparative result is the lower limit of the amplitude less than the detection threshold value scope of the coupled voltages signal, according to pre-
If adjustment amplitude thresholds increase the amplitude of the sine voltage signal that the signal generating unit occurs, until comparative result is adjustment
The amplitude of the corresponding coupled voltages signal of sine voltage signal afterwards is in the range of the detection threshold value.
Preferably, wherein the server is according to the sine voltage signal after adjustment and corresponding coupled voltages signal of change
The impedance of the quadrature component and in-phase component calculating current transformer secondary circuit that obtain, including：
Wherein, Z is the impedance of secondary loop of mutual inductor, U0It is the sine voltage signal of injection, n0For sinusoidal voltage is believed
The number of turn of number injection unit, n2For the number of turn of high-frequency current signal coupling unit, R are that high-frequency current signal coupling unit is sampled electricity
Resistance, x is the in-phase component for locking the output of phase amplifying unit, and y is the quadrature component for locking the output of phase amplifying unit.
Impedance by accurately detecting secondary loop of mutual inductor of the invention, just can normally identify big resistive
The normal connection of transformer secondary circuit and open-circuit condition, the normal connection of small resistive transformer secondary circuit and short-circuit shape
State.Fig. 3 is the equivalent circuit diagram of secondary loop of mutual inductor, as shown in figure 3, the secondary loop of mutual inductor is equivalent
Circuit diagram is made up of current transformer equivalent circuit Z1 and return wire equivalent circuit Z2, current transformer end is represented at 1, at 2
Represent detecting system end.Current transformer equivalent circuit Z1 is made up of equivalent inductance L1, equivalent capacity C1, equivalent resistance R1；Return
Line conductor equivalent circuit Z2 is made up of some equivalent resistances and equivalent capacity.Secondary loop of mutual inductor total impedance Z=Z1+
Z2, the computing formula of resistance Z1 is：
When Injection Signal be 20K sine voltage signals constantly, about at 0.05~0.5 ohm, C1 scopes about exist R1 scopes
100pF~10uF, L1 scope are calculated and understand Z1 scopes about at 0.5 ohm~40k ohm about in 10uH~100mH.
Return wire equivalent circuit Z2 is made up of some equivalent resistances and equivalent capacity.When Injection Signal is the sine of 20K
During voltage signal, the corresponding impedances of secondary loop of mutual inductor difference connection status return wire equivalent circuit Z2 are as follows：
When secondary loop of mutual inductor is normally connected,About 0.1~0.8 ohm of Z2 scopes；
Secondary loop of mutual inductor when current transformer end (at 1 of Fig. 3) opens a way,Z2 values exist
More than 300K ohm；
When Injection Signal be 20K, amplitude for 100mV sine wave, secondary loop of mutual inductor in test side Fig. 12
During place's open circuit, Z2 values are infinitely great.
When the sine voltage signal of high frequency 20K is injected, total impedance Z of the secondary loop of mutual inductor under different conditions
It is as follows：
Big resistive transformer (such as no-load voltage ratio 2000：5) the impedance loop Z=Z1+Z2, the largest of about 40K during normal connection
Ohm；
Impedance loop Z=Z2 when being opened a way at the 1 of secondary loop of mutual inductor Fig. 3, value is in more than 300K；
Impedance loop Z=Z2 convergences are infinitely great when being opened a way at the 2 of secondary loop of mutual inductor Fig. 3；
Small resistive transformer (such as no-load voltage ratio 50：5) minimum 0.5 ohm of impedance loop during normal connection；
During secondary loop of mutual inductor short circuit, impedance loop is about between 0.1 ohm~0.5 ohm.
From being analyzed above, the impedance of the normal connection status of secondary loop of mutual inductor is for about in 0.5 ohm~40K
It is loop short circuit state less than 0.5 ohm between ohm, is loop open-circuit condition more than 40K ohm, as long as can accurately detect
The impedance of secondary loop of mutual inductor, just can normally identify the normal connection of big resistive transformer secondary circuit and open
Line state, the normal connection of small resistive transformer secondary circuit and short-circuit condition.
Fig. 4 is the flow of the secondary loop of mutual inductor impedance online test method 400 according to embodiment of the present invention
Figure.As shown in figure 4, the secondary loop of mutual inductor impedance online test method 400 is used to return Current Transformer Secondary
Roadlock is anti-to carry out on-line checking, and methods described 400 is sinusoidal electric to current transformer injection in step 401 since step 101 place
Pressure signal.
Preferably, the width of the coupled voltages signal obtained by secondary loop of mutual inductor coupling is calculated in step 402
Value.
Preferably, step 403 by the amplitude of the coupled voltages signal and lock phase amplifying unit detection threshold value scope
It is compared, produces comparative result, and the amplitude of the sine voltage signal of the injection is adjusted according to the comparative result
It is whole.Preferably, wherein the amplitude by the coupled voltages signal is compared with the detection threshold value scope of lock phase amplifying unit
Compared with, comparative result is produced, and the amplitude of the sine voltage signal of the injection is adjusted according to the comparative result, wrap
Include：
If comparative result is the amplitude of the coupled voltages signal changes the signal in the range of the detection threshold value, not
The amplitude of the sine voltage signal that generating unit occurs；
If comparative result is the upper limit of the amplitude more than the detection threshold value scope of the coupled voltages signal, according to default
Adjustment amplitude thresholds reduce the amplitude of the sine voltage signal that the signal generating unit occurs, until after comparative result is for adjustment
The corresponding coupled voltages signal of sine voltage signal amplitude in the range of the detection threshold value；
If comparative result is the lower limit of the amplitude less than the detection threshold value scope of the coupled voltages signal, according to pre-
If adjustment amplitude thresholds increase the amplitude of the sine voltage signal that the signal generating unit occurs, until comparative result is adjustment
The amplitude of the corresponding coupled voltages signal of sine voltage signal afterwards is in the range of the detection threshold value.
Preferably, the sine voltage signal for being injected after step 404 is according to adjustment and corresponding coupled voltages signal of change
Quadrature component and in-phase component.
Preferably, sine voltage signal, quadrature component and the in-phase component injected after step 405 is according to the adjustment are calculated
The impedance of secondary loop of mutual inductor.Preferably, wherein described according to the sine voltage signal, orthogonal injected after the adjustment
The impedance of component and in-phase component calculating current transformer secondary circuit, including：
Wherein, Z is the impedance of secondary loop of mutual inductor, U0It is the sine voltage signal of injection, n0For sinusoidal voltage is believed
The number of turn of number injection unit, n2 is the number of turn of high-frequency current signal coupling unit, R is that high-frequency current signal coupling unit is sampled electricity
Resistance, x is the in-phase component for locking the output of phase amplifying unit, and y is the quadrature component for locking the output of phase amplifying unit.
In embodiments of the present invention a sine electricity that frequency is certain, amplitude is variable is produced using signal generating unit
Pressure signal, sine voltage signal injection unit turn ratio is n0:1, high-frequency current signal coupling unit turn ratio is 1:n2, signal
Amplitude com parison unit is detected in Fig. 1The size of amplitude feeds back to signal and control unit occurs, and locks phase amplifying unit output signal
Quadrature component y and in-phase component x, server can calculate shaking for signal according to the quadrature component y and in-phase component x of signal
Width A is mutually with signal：
To be injected into the sine voltage signal of secondary loop of mutual inductor,It is electricity in secondary loop of mutual inductor
Stream signal is coupled to the current signal for obtaining, describedIt is that current signal is coupled to the electricity for obtaining in secondary loop of mutual inductor
Current signal is in Fig. 3 in secondary loop of mutual inductor in stream signalIt isIt is injected into current transformer
High frequency sinusoidal voltage signal U in secondary circuit1=U0/n0,It is the sine voltage signal of injectionIt is coupled to current transformer
The current signal produced on secondary circuit, the impedance of secondary loop of mutual inductor is:
Accordingly, there exist
Wherein, U0It is the sine voltage signal of known injection, n0It is the sine voltage signal injection unit number of turn, n2It is high frequency
The current signal coupling unit number of turn, R high-frequency current signal coupling unit sampling resistors, x is the same phase for locking the output of phase amplifying unit
Component, y is the quadrature component for locking the output of phase amplifying unit.
The present invention is described by reference to a small amount of implementation method.However, it is known in those skilled in the art, as
What subsidiary Patent right requirement was limited, except the present invention other embodiments disclosed above equally fall of the invention
In the range of.
Normally, all terms for using in the claims are all solved according to them in the usual implication of technical field
Release, unless clearly defined in addition wherein.It is all of to be all opened ground with reference to " one/described/be somebody's turn to do [device, component etc.] "
At least one of described device, component etc. example is construed to, unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate order, unless explicitly stated otherwise.
Claims (7)
1. a kind of secondary loop of mutual inductor impedance on-line detecting system, it is characterised in that the system includes：Signal occurs
Unit, sine voltage signal injection unit, high-frequency current signal coupling unit, signal amplitude comparing unit, lock phase amplifying unit
And server,
The signal generating unit, input respectively with the sine voltage signal injection unit, lock-in amplifier unit
Input is connected with the output end of server, for producing sine voltage signal, and by the sine voltage signal send to
Sine voltage signal injection unit and lock phase amplifying unit；
The sine voltage signal injection unit, is connected with secondary loop of mutual inductor, for receiving the sinusoidal voltage
Signal is simultaneously injected into the secondary loop of mutual inductor；
The high-frequency current signal coupling unit, respectively with the secondary loop of mutual inductor, signal amplitude comparing unit
Input is connected with the input of lock phase amplifying unit, and coupling electricity is obtained for being coupled with the secondary loop of mutual inductor
Pressure signal, and the coupled voltages signal is respectively sent to signal amplitude comparing unit and lock phase amplifying unit；
The amplitude com parison unit, is connected with the server, for the amplitude of the coupled voltages signal mutually to be put with lock
The detection threshold value scope of big unit is compared, and produces comparative result, and the comparative result is sent to server；
The lock phase amplifying unit, respectively with the high-frequency current signal coupling unit and the output end of signal generating unit, with
And the input of server is connected, for according to the sine voltage signal and the coupled voltages signal of change quadrature component
And in-phase component, and the quadrature component and in-phase component are sent to server；And
The server, the amplitude of the sine voltage signal for being occurred to signal generating unit according to the comparative result is carried out
Adjustment；According to quadrature component and in-phase component that the sine voltage signal after adjustment and corresponding coupled voltages signal of change are obtained
The impedance of calculating current transformer secondary circuit.
2. system according to claim 1, it is characterised in that the lock phase amplifying unit includes：Pre-amplifying module, band
Pass filtering module, trigger module, 90 ° of phase shift modules, coherent detection module and low-pass filtering modules.
3. method according to claim 1, it is characterised in that the server occurs according to the comparative result to signal
The amplitude of the sine voltage signal that unit occurs is adjusted, including：
If the amplitude that comparative result is the coupled voltages signal changes the signal in the range of the detection threshold value, not occurring
The amplitude of the sine voltage signal that unit occurs；
If comparative result is the upper limit of the amplitude more than the detection threshold value scope of the coupled voltages signal, according to default adjustment
Amplitude thresholds reduce the amplitude of the sine voltage signal that the signal generating unit occurs, until comparative result be after adjustment just
The amplitude of the corresponding coupled voltages signal of string voltage signal is in the range of the detection threshold value；
If comparative result is the lower limit of the amplitude less than the detection threshold value scope of the coupled voltages signal, according to default tune
Whole amplitude thresholds increase the amplitude of the sine voltage signal that the signal generating unit occurs, until comparative result is after adjusting
The amplitude of the corresponding coupled voltages signal of sine voltage signal is in the range of the detection threshold value.
4. method according to claim 1, it is characterised in that the server according to the sine voltage signal after adjustment and
The impedance of quadrature component and in-phase component calculating current transformer secondary circuit that corresponding coupled voltages signal of change is obtained, bag
Include：
Wherein, Z is the impedance of secondary loop of mutual inductor, U0It is the sine voltage signal of injection, n0For sine voltage signal is noted
Enter the number of turn of unit, n2For the number of turn of high-frequency current signal coupling unit, R are high-frequency current signal coupling unit sampling resistor, x
It is the in-phase component of lock phase amplifying unit output, y is the quadrature component for locking the output of phase amplifying unit.
5. a kind of secondary loop of mutual inductor impedance online test method, it is characterised in that methods described includes：
Sine voltage signal is injected to current transformer；
Calculate the amplitude of the coupled voltages signal obtained by secondary loop of mutual inductor coupling；
The amplitude of the coupled voltages signal is compared with the detection threshold value scope of lock phase amplifying unit, producing ratio is relatively tied
Really, and according to the comparative result amplitude of the sine voltage signal of the injection is adjusted；
According to the sine voltage signal and corresponding coupled voltages signal of change quadrature component and in-phase component that are injected after adjustment；With
And
According to the sine voltage signal, quadrature component and in-phase component calculating current transformer secondary circuit that are injected after the adjustment
Impedance.
6. method according to claim 1, it is characterised in that the amplitude by the coupled voltages signal is mutually put with lock
The detection threshold value scope of big unit is compared, and produces comparative result, and according to the comparative result to the sine of the injection
The amplitude of voltage signal is adjusted, including：
If the amplitude that comparative result is the coupled voltages signal changes the signal in the range of the detection threshold value, not occurring
The amplitude of the sine voltage signal that unit occurs；
If comparative result is the upper limit of the amplitude more than the detection threshold value scope of the coupled voltages signal, according to default adjustment
Amplitude thresholds reduce the amplitude of the sine voltage signal that the signal generating unit occurs, until comparative result be after adjustment just
The amplitude of the corresponding coupled voltages signal of string voltage signal is in the range of the detection threshold value；
If comparative result is the lower limit of the amplitude less than the detection threshold value scope of the coupled voltages signal, according to default tune
Whole amplitude thresholds increase the amplitude of the sine voltage signal that the signal generating unit occurs, until comparative result is after adjusting
The amplitude of the corresponding coupled voltages signal of sine voltage signal is in the range of the detection threshold value.
7. method according to claim 1, it is characterised in that described according to the sinusoidal voltage injected after adjustment letter
Number, the impedance of quadrature component and in-phase component calculating current transformer secondary circuit, including：
Wherein, Z is the impedance of secondary loop of mutual inductor, U0It is the sine voltage signal of injection, n0For sine voltage signal is noted
Enter the number of turn of unit, n2For the number of turn of high-frequency current signal coupling unit, R are high-frequency current signal coupling unit sampling resistor, x
It is the in-phase component of lock phase amplifying unit output, y is the quadrature component for locking the output of phase amplifying unit.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108710098A (en) * | 2018-05-18 | 2018-10-26 | 深圳供电局有限公司 | A kind of secondary loop of mutual inductor load detection method |
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| CN110488215A (en) * | 2019-09-17 | 2019-11-22 | 深圳市晶扬电子有限公司 | Current transformer tests circuit, method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108710098A (en) * | 2018-05-18 | 2018-10-26 | 深圳供电局有限公司 | A kind of secondary loop of mutual inductor load detection method |
| CN108710098B (en) * | 2018-05-18 | 2021-02-19 | 深圳供电局有限公司 | Current transformer secondary circuit load detection method |
| CN108957140A (en) * | 2018-07-02 | 2018-12-07 | 中国电力科学研究院有限公司 | A kind of impedance measurement circuit system and method for wide dynamic range |
| CN108957140B (en) * | 2018-07-02 | 2022-07-01 | 中国电力科学研究院有限公司 | Loop impedance measurement system and method with wide dynamic range |
| CN110488215A (en) * | 2019-09-17 | 2019-11-22 | 深圳市晶扬电子有限公司 | Current transformer tests circuit, method and device |
| CN112415287A (en) * | 2020-11-16 | 2021-02-26 | 中国电力科学研究院有限公司 | Method and system for identifying transformation ratio replacement of metering current transformer |
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