CN106707026A - Device for measuring electric reactance of electric energy metering secondary circuit - Google Patents
Device for measuring electric reactance of electric energy metering secondary circuit Download PDFInfo
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- CN106707026A CN106707026A CN201710006694.3A CN201710006694A CN106707026A CN 106707026 A CN106707026 A CN 106707026A CN 201710006694 A CN201710006694 A CN 201710006694A CN 106707026 A CN106707026 A CN 106707026A
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- current transformer
- energy metering
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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
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Abstract
The invention discloses a device for measuring the electric reactance of an electric energy metering secondary circuit and belongs to the field of power system measurement, which solves the problem that the electric reactance of a secondary circuit cannot be measured in real time in the online manner in the prior art. The device comprises an injection waveform module, a first current transformer, a second current transformer, an inductive acquisition module, a waveform comparison module and a data processing module. The first current transformer and the second current transformer obtain the response of the secondary circuit in the electromagnetic coupling manner. The injection waveform module and the inductive acquisition module convert the excitation and the response of the secondary circuit into voltage waveform signals, respectively. The waveform comparison module compares two paths of voltage waveform signals to obtain an amplitude value difference and a phase difference. The data processing module acquires the impedance of the electric energy metering secondary circuit according to the amplitude value difference and the phase difference, and then takes the imaginary part of the electric reactance to obtain the electric reactance of the electric energy metering secondary circuit. The device is particularly applicable to the detection of an electric energy CT metering secondary circuit and is wide in market prospect.
Description
Technical field
The present invention relates to a kind of device for measuring electric energy metering secondary reactance, particularly a kind of measurement electric energy CT meterings
The device of secondary circuit reactance, belongs to power system measuring field.
Background technology
During new electric substation puts into operation, the electric energy metering secondary of electric substation, if there is problem, will have a strong impact on
The metering of full institute's equipment, directly affect monitoring and judgement of the distant place to substation facilities.Meanwhile, secondary circuit goes wrong will be made
Into the malfunction or tripping of protection device, the serious harm safe operation of power network, is a weak ring in relay protection work
Section.
Current transformer, abbreviation CT is primary side（Input side）And secondary side（Outlet side）Between contact element, by iron
Core, first winding, Secondary Winding, binding post and insulation stent etc. are constituted.The number of turn of the first winding of CT is less, is serially connected in
Need measure electric current circuit in；The number of turn of Secondary Winding is more, is serially connected in measuring instrumentss or relay protection circuit.Electric energy meter
Amount secondary circuit is made up of CT or voltage transformer, secondary circuit, wiring unit and electric energy meter.In order to ensure electric energy metrical
Accuracy, current authority file proposes the requirement such as structure, no-load voltage ratio information to CT.But after CT accesses secondary circuit,
Its loop characteristic has occurred that change relative to simple CT, and CT metering secondaries are only judged by the index of authority file
State be inadequate, it is necessary to be studied comprising all loads of whole secondary circuit, it is preferred that emphasis is the electricity of research secondary circuit
It is anti-（Including induction reactance and capacitive reactance）.Reactance has the characteristic of inhibition to alternating current in circuit, and the capacitive or perception of reactance can
The characteristics of to determine electric energy metering secondary.
The e measurement technology taken is off-line type and measures at present, will CT primary side and secondary side all disconnect, using LCR
Electric bridge is accessed at the breakpoint of secondary circuit, and its reactance value is measured under certain test frequency.There are two aspects in this technology
Shortcoming：1st, because the metering system needs for LCR to access metering secondary, it is necessary to disconnect measurement loop and provide access
Point, and scene CT secondary circuits cannot provide breakpoint, therefore the metering system is only limitted in labs test job, it is impossible to
Use at the scene.2nd, can be obtained by the principle of electromagnetic transformer, when its primary side includes actual load electric current, its reactance is CT
Change with the change of primary side current signal frequency, in actual operating mode, primary side current be 50Hz periodically
Current capacity, Current Transformer Secondary side produce induced-current be 0-5A, therefore secondary circuit reactance induction reactance part with hold
Anti- part is the dynamic change of 50Hz also with primary side current generating period.Therefore surveyed by the way of LCR electric bridges are accessed
During amount transformer secondary circuit reactance, circuit reactance when its measured value is only CT primary side no currents, to there is electricity during electric current
The measurement meaning of road reactance is simultaneously little.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of device for measuring electric energy metering secondary reactance, solves existing
Have technology cannot in On-line sampling system secondary circuit reactance technical problem.
In order to solve the above-mentioned technical problem, the invention provides a kind of device for measuring electric energy metering secondary reactance,
Including injection waveform module, the first current transformer, the second current transformer, inductive pick-up module, waveform comparison module and number
According to processing module；
The injection waveform module is connected with the first current transformer, the driving electricity needed for for producing the first current transformer
Stream, while gathering the waveform voltage signal of driving current and sending to waveform comparison module；
First current transformer is connected with the wire of electric energy metering secondary, in the presence of the driving current
Produce coupling excitation and be input into and encouraged to the wire input coupling；
Second current transformer is connected with the wire of electric energy metering secondary, for detecting the coupling excitation in electric energy
The coupling response produced in metering secondary；
The inductive pick-up module is connected with the second current transformer, for gather the coupling response waveform voltage signal simultaneously
Send to waveform comparison module；
The waveform comparison module is connected with injection waveform module, inductive pick-up module respectively, for receiving the driving current
Waveform voltage signal and coupling response waveform voltage signal and processed, obtain waveform comparison result；
The data processing module is connected with waveform comparison module, for reading the waveform comparison result, while according to waveform
Comparative result obtains the impedance of electric energy metering secondary and takes imaginary part, obtains the reactance of electric energy metering secondary.
The structure of first current transformer is the annulus for being provided with opening, the wire of electric energy metering secondary through
In the annulus of the first current transformer.
The structure of second current transformer is the annulus for being provided with opening, the wire of electric energy metering secondary through
In the annulus of the second current transformer.
The injection waveform module includes sine wave generating unit, current driver unit with injection waveform acquisition unit；
The sine wave generating unit is connected by the first driving wire with current driver unit, for producing sine wave signal simultaneously
Send to the current driver unit；
The current driver unit is connected by the second driving wire with the first current transformer, in the sine wave signal
Control under produce the first current transformer needed for driving current；
The injection waveform acquisition unit is connected by the first differential conductor with current driver unit, and by the first data/address bus
It is connected with waveform comparison module, for gathering the waveform voltage signal of the driving current and sending to waveform comparison module.
Direct Digital Frequency Synthesizers DDS is provided with the sine wave generating unit, for producing different voltage magnitudes, no
The sine wave of same frequency.
Emitter follower is provided with the current driver unit, the output for stablizing the driving current.
The first analog-digital signal conversion device is provided with the injection waveform acquisition unit, for by the electricity of the driving current
Pressure signal waveform is converted into digital signal form from analog signal form.
The inductive pick-up module includes signal condition unit and inductive waveform collecting unit；
The signal condition unit is connected by coupling output lead with the second current transformer, for entering to the coupling response
The treatment of the amplification of row signal, bandpass filtering, DC-isolation and level conversion, obtains coupling conditioned signal；
The inductive waveform collecting unit is connected by the second differential conductor with signal condition unit, and by the second data/address bus
It is connected with waveform comparison module, for gathering the waveform voltage signal of the coupling conditioned signal and sending to waveform comparison mould
Block.
The second analog-digital signal conversion device is provided with the inductive waveform collecting unit, for by the coupling conditioned signal
Waveform voltage signal be converted into digital signal form from analog signal form.
The waveform comparison result includes amplitude value difference and phase difference；The waveform comparison module is by the voltage of coupling response
The corresponding range value of signal waveform subtracts the corresponding range value of waveform voltage signal of driving current, obtains amplitude value difference；By coupling
The corresponding phase value of waveform voltage signal for closing response subtracts the corresponding phase value of waveform voltage signal of driving current, obtains phase
Potential difference.The present invention is provided with the first current transformer and the second current transformer, obtains secondary by way of electromagnetic coupled mutual inductance
The signal in loop, realizes the reactance of On-line sampling system secondary circuit.
The present invention is provided with waveform comparison module, is believed by the voltage of the waveform voltage signal to driving current and coupling response
The waveform of number waveform is compared, and obtains amplitude value difference and phase difference, good reliability and simple to operate.
The present invention is provided with data processing module, the calculating of secondary circuit reactance is realized by computer numerical value calculation, effectively
Raising equipment operating efficiency.
The present invention drives the first current transformer by injecting waveform module, while gathering the voltage signal ripple of driving current
Shape is simultaneously sent to waveform comparison module.First current transformer is encouraged to the wire input coupling of secondary circuit；Second electric current is mutual
The coupling response that sensor detection coupling excitation is produced in electric energy metering secondary, and transmit to inductive pick-up module.Sensing
The corresponding waveform voltage signal of acquisition module collection coupling response, and send to waveform comparison module.Waveform comparison module is received
The waveform voltage signal of the driving current and the waveform voltage signal of coupling response, waveform comparison knot is obtained after comparing treatment
Really, and send to data processing module；Data processing module is calculated the reactance of secondary circuit according to waveform comparison result.This
The features such as invention has measurement in real time, current transformer access convenient and responds rapid, wide market.
Brief description of the drawings
Fig. 1 is system construction drawing of the invention；
In figure：1. secondary circuit CT is tested；2. electric energy meter is loaded with terminal box；3. the first current transformer；4. the second electric current is mutual
Sensor；5. sine wave generating unit；6. current driver unit；7. signal condition unit；8. waveform acquisition unit is injected；9. sense
Waveform acquisition unit；10. waveform comparison module；11. data processing modules；12. injection waveform modules；13. inductive pick-up modules.
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, so that those skilled in the art can be with
More fully understand the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
Embodiment 1：
It is mutual that the present embodiment loads the 2, first electric current by tested secondary circuit CT1, tested secondary circuit wire, electric energy meter and terminal box
Sensor 3, the second current transformer 4, waveform comparison module 10, data processing module 11, waveform comparison module 12 and inductive pick-up
Module 13 is constituted.Secondary circuit CT1 is wherein tested to be connected by tested secondary circuit wire with electric energy meter with terminal box load 2,
Constitute tested electric energy metering secondary.Injection waveform module 12 is by sine wave generating unit 5, current driver unit 6 and injection
Waveform acquisition unit 8 is constituted；Inductive pick-up module 13 is made up of signal condition unit 7 with inductive waveform collecting unit 9.Tested two
From the low-voltage current mutual inductor of model LMZ3D, accuracy class is 0.2S to minor loop CT1, and nominal transformation ratio is 800A/5A, secondary
Load is 5VA/2.5VA.Electric energy meter is taken with the electric energy meter in terminal box load 2 from the three-phase and four-line of model DTZY566-G
Control intelligent electric energy meter.The structure of the first current transformer 3 is the annulus for being provided with opening, the ferrite of material selection AKH-0.66-K
Material, and 20 circle coils are wound with annulus.The structure of the second current transformer 4 is the annulus for being provided with opening, material selection
The ferrite material of AKH-0.66-K, and 100 circle coils are wound with annulus.Sine wave generating unit 5 is main by integrated DDS
Chip AD9854 is constituted, and wherein crystal oscillator clock frequency is 300MHz.After current driver unit 6 is by operational amplifier OPA2227UA
Connect emitter follower realization.Injection waveform acquisition unit 8 is realized by integrated chip ADS8365, with 16 parallel-by-bit interfaces ,+5V
Power supply, and when reference clock signal is up to 5MHz, the conversion time of ADS8365 is 3.2us.Signal condition unit 7 is included
Signal amplifier, bandpass filter, DC isolator and level translator；Wherein signal amplifier uses two-stage calculation amplifier
Circuit, is realized, two-stage calculation amplifier realizes 25 times of gains altogether by OPA2340；Bandpass filter cut-off frequency is 5KHz-
50KHz, cut-off frequency goes out to decay to 3DB；DC isolator is made up of block capacitor；Level translator is by RS-485 standard electrics
Straight cut is constituted.Inductive waveform collecting unit 9 is realized by another piece of integrated chip ADS8365.Waveform comparison module 10 by
Cortex M3 series monolithics STM32F103ZET6 is realized.Data processing module 11 is by the embedded meters of ARK-3440F-U1A2E
Calculation machine is realized, and is provided with data storage storehouse.DDS output interfaces in sine wave generating unit 5 drive wire with electricity by first
Operational amplifier in stream driver element 6 is connected；Emitter follower in current driver unit 6 drives wire and the by second
The coil of one current transformer 3 is connected.ADS8365 inputs in injection waveform acquisition unit 8 by the first differential conductor with
The emitter follower of current driver unit 6 is connected；ADS8365 output ends in injection waveform acquisition unit 8 pass through the first data
Bus is connected with waveform comparison module 10.Signal amplifier input in signal condition unit 7 by couple output lead with
The coil of the second current transformer 4 is connected；ADS8365 inputs in inductive waveform collecting unit 9 pass through the second differential conductor
Output end with the RS-485 level translators in signal condition unit 7 is connected.The STM32F103ZET6 of waveform comparison module 10
Single-chip microcomputer input interface respectively with injection waveform acquisition unit 8, the corresponding ADS8365 of inductive waveform collecting unit 9 output end
It is connected, and by upper bit data bus and the ARK-3440F-U1A2E embedded computer input interfaces of data processing module 11
It is connected.When first current transformer, the second current transformer are installed, power off tested electric energy metering secondary, by secondary returning
The wire on road is passed through by the annular indentation of the first current transformer 3（Run through）Annulus, second is passed through by the wire of secondary circuit
The annular indentation of current transformer 4 is passed through（Run through）Annulus, wherein the first current transformer 3 is being led with the second current transformer 4
Position on line can exchange.
The course of work of the present embodiment is as follows：Under tested electric energy metering secondary charging operation state, start this dress
Put, its modules is switched on power.Operator is configured accordingly according to the load model of secondary circuit to each module.
After each module of device initialization, the sine wave generating unit 5 in injection waveform module 12 generates certain amplitude and frequency by DDS
Sine wave, and send to current driver unit 6；The sine wave that operational amplifier in current driver unit 6 will be received enters
Row signal amplifies, and is exported to the first current transformer 3 by emitter follower.First current transformer 3 is imitated by electromagnetic coupled
Input coupling should be encouraged in secondary circuit, coupling excitation generates coupling response in secondary circuit（Secondary circuit is regarded as
One system）, the second current transformer 4 by mutual inductance effect sense detect coupling response.Letter in inductive pick-up module 13
Number conditioning unit 7 carries out the treatment of signal amplification, bandpass filtering, DC-isolation and level conversion to coupling response, obtains coupling and adjusts
Reason signal；The waveform voltage signal of the collection coupling conditioned signal of inductive waveform collecting unit 9, while by the mould of waveform voltage signal
Intend signal form and be converted into digital signal form（Dot matrix waveform）, and send to waveform comparison module 10.Waveform acquisition unit 8 is adopted
Collect the waveform voltage signal of the driving current, while the analog signal form of waveform voltage signal is converted into data signal shape
Formula（Dot matrix waveform）, and send to waveform comparison module 10.Waveform comparison module 10 receives the waveform voltage signal of driving current
With the waveform voltage signal of coupling response, and the corresponding range value of the waveform voltage signal of coupling response is subtracted into driving current
The corresponding range value of waveform voltage signal, obtain amplitude value difference；By the corresponding phase value of the waveform voltage signal of coupling response
The corresponding phase value of waveform voltage signal of driving current is subtracted, phase difference is obtained；Amplitude value difference and phase difference are exported simultaneously
To data processing module 11.Data processing module 11 obtains electric energy according to amplitude value difference and phase difference by the way of numerical computations
The impedance of metering secondary simultaneously takes imaginary part, obtains the reactance of electric energy metering secondary.It is sense if reactance value is more than zero
Property reactance, characterize secondary circuit be in inductive nature（Logical direct current resistance exchange）；It is condensance if reactance value is less than zero, characterizes two
Minor loop is in capacitive properties（Logical exchange stopping direct current）If reactance value is equal to zero, it is in electrical resistance property to characterize secondary circuit.Operator's root
The property in current secondary loop is judged according to the characteristic of reactance.Subsequent data processing module 11 is by time of measuring, load parameter, amplitude
In the data storages such as value difference, phase difference, impedance and reactance to itself data storage storehouse.Operator can transfer specified as needed
The measurement data information of time of measuring.
The structure of the first current transformer of the invention is the annulus for being provided with opening, is easily installed, and at utmost improves electricity
The efficiency of magnetic coupling injection.
The structure of the first current transformer of the invention is the annulus for being provided with opening, is easily installed, and at utmost improves electricity
The efficiency of magnetic coupling detection.
Direct Digital Frequency Synthesizers DDS is provided with sine wave generating unit of the invention, with frequency is accurate, resolution ratio
Height, and easily controllable advantage.
Emitter follower is provided with current driver unit of the invention, with driving current output impedance is reduced, is increased and is driven
The effect of kinetic force.
The first modulus signal converter is provided with injection waveform acquisition unit of the invention, for by waveform voltage signal
Analog signal form is converted to digital signal form, facilitates waveform comparison module that the meter of phase difference is carried out using digital phase discriminator
Calculate, effectively reduce waveform comparison error, be easy to data storage.
The second modulus signal converter is provided with inductive waveform collecting unit of the invention, for by waveform voltage signal
Analog signal form is converted to digital signal form, facilitates waveform comparison module that the meter of phase difference is carried out using digital phase discriminator
Calculate, effectively reduce waveform comparison error, be easy to data storage.
Embodiment 2：
It is mutual that the present embodiment loads the 2, first electric current by tested secondary circuit CT1, tested secondary circuit wire, electric energy meter and terminal box
Sensor 3, the second current transformer 4, waveform comparison module 10, data processing module 11, waveform comparison module 12 and inductive pick-up
Module 13 is constituted.Secondary circuit CT1 is wherein tested to be connected by tested secondary circuit wire with electric energy meter with terminal box load 2,
Constitute tested electric energy metering secondary.Injection waveform module 12 is by sine wave generating unit 5, current driver unit 6 and injection
Waveform acquisition unit 8 is constituted；Inductive pick-up module 13 is made up of signal condition unit 7 with inductive waveform collecting unit 9.Tested two
From the low-voltage current mutual inductor of model LMZ3D, accuracy class is 0.2S to minor loop CT1, and nominal transformation ratio is 800A/5A, secondary
Load is 5VA/2.5VA.Electric energy meter is taken with the electric energy meter in terminal box load 2 from the three-phase and four-line of model DTZY566-G
Control intelligent electric energy meter.The structure of the first current transformer 3 is the annulus for being provided with opening, the ferrite of material selection AKH-0.66-K
Material, and 20 circle coils are wound with annulus.The structure of the second current transformer 4 is the annulus for being provided with opening, material selection
The ferrite material of AKH-0.66-K, and 50 circle coils are wound with annulus.Sine wave generating unit 5 is main by integrated DDS
Chip AD9854 is constituted, and wherein crystal oscillator clock frequency is 300MHz.After current driver unit 6 is by operational amplifier OPA2227UA
Connect emitter follower realization.Injection waveform acquisition unit 8 is realized by integrated chip ADS8365, with 16 parallel-by-bit interfaces ,+5V
Power supply, 6 synchronous acquisition passages, and when reference clock signal is up to 5MHz, the conversion time of ADS8365 is 3.2us.Letter
Number conditioning unit 7 includes signal amplifier, bandpass filter, DC isolator and level translator；Wherein signal amplifier is adopted
Two-stage calculation amplifier circuit is used, is realized by OPA2340, two-stage calculation amplifier realizes 25 times of gains altogether；Bandpass filter cuts
Only frequency is 5KHz-50KHz, and cut-off frequency goes out to decay to 3DB；DC isolator is made up of block capacitor；Level translator
It is made up of rs-232 standard electric level interface.Inductive waveform collecting unit 9 is by the integrated chip ADS8365 of injection waveform acquisition unit 8
Realize（One piece of acquisition chip is shared, realizes that two paths of signals is input into by different acquisition passage）.Waveform comparison module 10 by
Cortex M3 series monolithics STM32F103ZET6 is realized.Data processing module 11 is by the embedded meters of ARK-3440F-U1A2E
Calculation machine is realized, and is provided with data storage storehouse.DDS output interfaces in sine wave generating unit 5 drive wire with electricity by first
Operational amplifier in stream driver element 6 is connected；Emitter follower in current driver unit 6 drives wire and the by second
The coil of one current transformer 3 is connected.ADS8365 inputs in injection waveform acquisition unit 8 by the first differential conductor with
The emitter follower of current driver unit 6 is connected；The corresponding ADS8365 output ends of injection waveform acquisition unit 8 are by the first number
It is connected with waveform comparison module 10 according to bus.Signal amplifier input in signal condition unit 7 is by coupling output lead
Coil with the second current transformer 4 is connected；The corresponding ADS8365 inputs of inductive waveform collecting unit 9 pass through the second difference
Wire is connected with the output end of the RS-232 level translators in signal condition unit 7.Waveform comparison module 10
STM32F103ZET6 single-chip microcomputers input interface is corresponding with injection waveform acquisition unit 8, inductive waveform collecting unit 9 respectively
The output end of ADS8365 is connected, and the ARK-3440F-U1A2E insertions for passing through upper bit data bus and data processing module 11
Formula computer input interface is connected.Meanwhile, the STM32F103ZET6 single-chip microcomputers output interface of waveform comparison module 10 is by feedback
Holding wire is connected with the DDS in sine wave generating unit 5.When first current transformer, the second current transformer are installed, make to be tested
Electric energy metering secondary is powered off, and the wire of secondary circuit is passed through by the annular indentation of the first current transformer 3（Run through）
Annulus, the wire of secondary circuit is passed through by the annular indentation of the second current transformer 4（Run through）Annulus, wherein the first electric current
Position of the transformer 3 with the second current transformer 4 on wire can exchange.
The course of work of the present embodiment is as follows：Under tested electric energy metering secondary charging operation state, start this dress
Put, its modules is switched on power.Operator is configured accordingly according to the load model of secondary circuit to each module.
After each module of device initialization, the sine wave generating unit 5 in injection waveform module 12 generates certain amplitude and frequency by DDS
Sine wave, and send to current driver unit 6；The sine wave that operational amplifier in current driver unit 6 will be received enters
Row signal amplifies, and is exported to the first current transformer 3 by emitter follower.First current transformer 3 is imitated by electromagnetic coupled
Input coupling should be encouraged in secondary circuit, coupling excitation generates coupling response in secondary circuit（Secondary circuit is regarded as
One system）, the second current transformer 4 by mutual inductance effect sense detect coupling response.Letter in inductive pick-up module 13
Number conditioning unit 7 carries out the treatment of signal amplification, bandpass filtering, DC-isolation and level conversion to coupling response, obtains coupling and adjusts
Reason signal；The waveform voltage signal of the collection coupling conditioned signal of inductive waveform collecting unit 9, while by the mould of waveform voltage signal
Intend signal form and be converted into digital signal form（Dot matrix waveform）, and send to waveform comparison module 10.Waveform acquisition unit 8 is adopted
Collect the waveform voltage signal of the driving current, while the analog signal form of waveform voltage signal is converted into data signal shape
Formula（Dot matrix waveform）, and send to waveform comparison module 10.Waveform comparison module 10 receives the waveform voltage signal of driving current
With the waveform voltage signal of coupling response, and the corresponding range value of the waveform voltage signal of coupling response is subtracted into driving current
The corresponding range value of waveform voltage signal, obtain amplitude value difference；By the corresponding phase value of the waveform voltage signal of coupling response
The corresponding phase value of waveform voltage signal of driving current is subtracted, phase difference is obtained；Waveform comparison module 10 by amplitude value difference with
Phase difference is exported to data processing module 11, while carrying out data interval analysis according to amplitude value difference and phase difference, and is adjusted just
The parameter of the DDS in string ripple generating unit 5（Adjust the output amplitude and frequency of sine wave）.Data processing module 11 is according to amplitude
Value difference is obtained the impedance of electric energy metering secondary by the way of numerical computations and takes imaginary part with phase difference, obtains electric energy
The reactance of metering secondary.It is inductive reactance if reactance value is more than zero, it is in inductive nature to characterize secondary circuit（Logical direct current resistance
Exchange）；It is condensance if reactance value is less than zero, it is in capacitive properties to characterize secondary circuit（Logical exchange stopping direct current）If, reactance value
Equal to zero, it is in electrical resistance property to characterize secondary circuit.Operator judges the property in current secondary loop according to the characteristic of reactance.Then
Data processing module 11 by the data storages such as time of measuring, load parameter, amplitude value difference, phase difference, impedance and reactance to itself
In data storage storehouse, subsequent each module of device initialization carries out next round test to secondary circuit.Operator can be as needed
Transfer the measurement data information of specified measurement time.
Waveform acquisition unit is injected in the present embodiment and shares one piece of acquisition chip with inductive waveform collecting unit, simplify dress
The configuration put.
With sine wave generating unit be connected waveform comparison module by feedback signal line by the present embodiment, constitutes a closed loop
Control system, is conducive to correcting measurement error, improves the accuracy of device.
Data storage storehouse is provided with the data processing module of the present embodiment, is easy to preserve measurement parameter information and number of results
According to.
The beneficial effects of the present invention are：Comprehensive induction reactance or capacitive reactance in prior art measurement electric energy metering secondary,
Secondary circuit is in open-circuit condition, test equipment is linked at breakpoint and is measured, inefficiency, and destroy secondary returning
Road；The present invention uses the lossless access secondary circuit of open circular, and secondary circuit is all measurable under any circumstance, safer
It is convenient.The measuring apparatus of prior art can only be measured under single operating mode（No current in electric energy metering secondary）Characteristic, nothing
Method learns characteristic of the secondary circuit under alternating current；The present invention does not influence the characteristic in loop, measure different load levels with
The characteristic in the loop under the various workings such as load type, supports that scope is wider.Prior art relies on test environment, once secondary returning
Road is resumed work, and just cannot continue measurement；The built-in data storage storehouse of the present invention, the data of long term monitoring are preserved and uploaded to
In main website server, long-term on-line real time monitoring is realized.The present invention has that easy for installation, simple to operate, frequency is accurate, waveform is steady
Calmly, the features such as real-time is high and easily controllable, is particularly well-suited to the detection of electric energy CT metering secondaries, possesses good market
Economic benefit and application prospect.
Embodiment described above is only the preferred embodiment lifted to absolutely prove the present invention, protection model of the invention
Enclose not limited to this.Equivalent substitute or conversion that those skilled in the art are made on the basis of the present invention, in the present invention
Protection domain within.Protection scope of the present invention is defined by claims.
Claims (10)
1. it is a kind of measure electric energy metering secondary reactance device, it is characterised in that including injection waveform module, the first electric current
Transformer, the second current transformer, inductive pick-up module, waveform comparison module and data processing module；
The injection waveform module is connected with the first current transformer, the driving electricity needed for for producing the first current transformer
Stream, while gathering the waveform voltage signal of driving current and sending to waveform comparison module；
First current transformer is connected with the wire of electric energy metering secondary, in the presence of the driving current
Produce coupling excitation and input lead；
Second current transformer is connected with the wire of electric energy metering secondary, for detecting the coupling excitation in electric energy
The coupling response produced in metering secondary；
The inductive pick-up module is connected with the second current transformer, for gather the coupling response waveform voltage signal simultaneously
Send to waveform comparison module；
The waveform comparison module is connected with injection waveform module, inductive pick-up module respectively, for receiving the driving current
Waveform voltage signal and coupling response waveform voltage signal and processed, obtain waveform comparison result；
The data processing module is connected with waveform comparison module, for reading the waveform comparison result, while according to waveform
Comparative result obtains the impedance of electric energy metering secondary and takes imaginary part, obtains the reactance of electric energy metering secondary.
2. it is according to claim 1 measurement electric energy metering secondary reactance device, it is characterised in that it is described first electricity
The structure of current transformer is the annulus for being provided with opening, the circle of the wire of electric energy metering secondary through the first current transformer
In ring.
3. it is according to claim 1 measurement electric energy metering secondary reactance device, it is characterised in that it is described second electricity
The structure of current transformer is the annulus for being provided with opening, the circle of the wire of electric energy metering secondary through the second current transformer
In ring.
4. it is according to claim 1 measurement electric energy metering secondary reactance device, it is characterised in that the injection ripple
Shape module includes sine wave generating unit, current driver unit with injection waveform acquisition unit；
The sine wave generating unit is connected by the first driving wire with current driver unit, for producing sine wave signal simultaneously
Send to the current driver unit；
The current driver unit is connected by the second driving wire with the first current transformer, in the sine wave signal
Control under produce the first current transformer needed for driving current；
The injection waveform acquisition unit is connected by the first differential conductor with current driver unit, and by the first data/address bus
It is connected with waveform comparison module, for gathering the waveform voltage signal of the driving current and sending to waveform comparison module.
5. it is according to claim 4 measurement electric energy metering secondary reactance device, it is characterised in that the sine wave
Direct Digital Frequency Synthesizers DDS is provided with generating unit, the sine wave for producing different voltage magnitudes, different frequency.
6. the device of measurement electric energy metering secondary reactance according to claim 4, it is characterised in that the electric current drives
Emitter follower is provided with moving cell, the output for stablizing the driving current.
7. it is according to claim 4 measurement electric energy metering secondary reactance device, it is characterised in that the injection ripple
The first modulus signal converter is provided with shape collecting unit, for by the waveform voltage signal of the driving current from analog signal
Form is converted into digital signal form.
8. it is according to claim 1 measurement electric energy metering secondary reactance device, it is characterised in that the sensing is adopted
Collection module includes signal condition unit and inductive waveform collecting unit；
The signal condition unit is connected by coupling output lead with the second current transformer, for entering to the coupling response
The treatment of the amplification of row signal, bandpass filtering, DC-isolation and level conversion, obtains coupling conditioned signal；
The inductive waveform collecting unit is connected by the second differential conductor with signal condition unit, and by the second data/address bus
It is connected with waveform comparison module, for gathering the waveform voltage signal of the coupling conditioned signal and sending to waveform comparison mould
Block.
9. it is according to claim 8 measurement electric energy metering secondary reactance device, it is characterised in that the sensing ripple
The second modulus signal converter is provided with shape collecting unit, for by the waveform voltage signal of the coupling conditioned signal from simulation
Signal form is converted into digital signal form.
10. it is according to claim 1 measurement electric energy metering secondary reactance device, it is characterised in that the waveform
Comparative result includes amplitude value difference and phase difference；The waveform comparison module is by the corresponding width of the waveform voltage signal of coupling response
Angle value subtracts the corresponding range value of waveform voltage signal of driving current, obtains amplitude value difference；By the voltage signal of coupling response
The corresponding phase value of waveform subtracts the corresponding phase value of waveform voltage signal of driving current, obtains phase difference.
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| CN201710006694.3A CN106707026A (en) | 2017-01-05 | 2017-01-05 | Device for measuring electric reactance of electric energy metering secondary circuit |
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| CN107656104A (en) * | 2017-10-31 | 2018-02-02 | 广东电网有限责任公司电力科学研究院 | A kind of intelligent wiring box and critical point electric energy metering secondary state monitoring method |
| CN110632448A (en) * | 2019-09-16 | 2019-12-31 | 深圳供电局有限公司 | Wiring detection method for three-phase three-wire metering device with mutual inductor |
| CN111999600A (en) * | 2020-08-25 | 2020-11-27 | 武汉中元华电电力设备有限公司 | Intelligent distribution network terminal secondary current loop fault diagnosis positioning method and system |
| US11538628B2 (en) | 2019-12-02 | 2022-12-27 | Panoramic Power Ltd. | Self calibration by signal injection |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107656104A (en) * | 2017-10-31 | 2018-02-02 | 广东电网有限责任公司电力科学研究院 | A kind of intelligent wiring box and critical point electric energy metering secondary state monitoring method |
| CN110632448A (en) * | 2019-09-16 | 2019-12-31 | 深圳供电局有限公司 | Wiring detection method for three-phase three-wire metering device with mutual inductor |
| CN110632448B (en) * | 2019-09-16 | 2022-07-15 | 深圳供电局有限公司 | Wiring detection method for three-phase three-wire metering device with mutual inductor |
| US11538628B2 (en) | 2019-12-02 | 2022-12-27 | Panoramic Power Ltd. | Self calibration by signal injection |
| US11705275B2 (en) * | 2019-12-02 | 2023-07-18 | Panoramic Power Ltd. | Self calibration by double signal sampling |
| CN111999600A (en) * | 2020-08-25 | 2020-11-27 | 武汉中元华电电力设备有限公司 | Intelligent distribution network terminal secondary current loop fault diagnosis positioning method and system |
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