CN106443537A - Calibration method for online capacitive equipment insulation parameter monitoring device and calibration equipment - Google Patents
Calibration method for online capacitive equipment insulation parameter monitoring device and calibration equipment Download PDFInfo
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- CN106443537A CN106443537A CN201610266900.XA CN201610266900A CN106443537A CN 106443537 A CN106443537 A CN 106443537A CN 201610266900 A CN201610266900 A CN 201610266900A CN 106443537 A CN106443537 A CN 106443537A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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Abstract
The invention relates to a calibration equipment used for calibrating an online capacitive equipment insulation parameter monitoring device. The calibration equipment comprises a image current source unit and a standard current source unit, wherein the image current source unit and the online monitoring device form a current measurement loop, the image current source unit is used for sampling leakage current signals of the online monitoring device to acquire sampling signals and further used for processing the sampling signals to acquire current signals, the current signals and the leakage current signals are identical in amplitudes and are opposite in phases, the same-amplitude and opposite-phase current signals are accessed to the current measurement loop of the online monitoring device, the standard current source unit generates standard amplitude-controllable phase-controllable current signals and is connected in parallel with the current measurement loop of the online monitoring device, and the online monitoring device is calibrated on the condition that the electric power field is not in a power failure state.
Description
Technical field
The present invention relates to measurement and calibration field, and more particularly, to a kind of capacitive apparatus insulated parameter online
The calibration steps of device and equipment.
Background technology
Carrying out of capacitive apparatus repair based on condition of component work is increasingly deep, and increasing Condition Monitoring Technology is applied to capacitive
In the daily state analysis detection of equipment.Capacitive apparatus insulated parameter on-line monitoring device is relied on to carry out monitoring to operation equipment,
Grasp equipment running status accurately and in time, it is ensured that the safe and reliable and economical operation of equipment has progressively become power system
The monitoring technology of normalization.The accuracy of capacitive apparatus insulated parameter on-line monitoring device measurement data and reliability directly affect
The effect to power equipment state monitoring, thus it is effectively verified most important under electric field environment.
Verification, scaling method that prior art relates to all fail to enter from the angle of metering under electric field live state
Row design, and do not have transmission of quantity value and the ability traced to the source, the capacitive apparatus insulated parameter solving under electric field environment is existed
There is certain defect in the problem of line monitoring device verification.In order to realize carrying out capacitive apparatus in the case of not power-off as far as possible
Calibration, it is necessary to overcome the interference that in capacitive apparatus current sensor institute's monitoring current loop, original leakage current introduces.
Content of the invention
In order to solve the problems referred to above, the present invention provides a kind of calibrator (-ter) unit, online for capacitive apparatus insulated parameter
Monitoring device is calibrated, and described calibrator (-ter) unit includes：
Image current source unit, forms current measurement circuit with described on-Line Monitor Device, to described on-Line Monitor Device
Leakage current signal be sampled to obtain sampled signal, carry out to described sampled signal processing to obtain and letting out of being sampled
The amplitude of leakage current signal is identical and the current signal of opposite in phase, and by identical for described amplitude and opposite in phase electricity
Stream signal accesses the current measurement circuit of described on-Line Monitor Device；And
The controlled standard current signal of normalized current source unit, generation amplitude and phase place, the described on-line monitoring of access in parallel
In the current measurement circuit of device, under electric field live state, described on-Line Monitor Device is verified.
Preferably, wherein said image current source unit includes：
Pincerlike sensor, for being sampled to the leakage current signal of described on-Line Monitor Device to obtain sampling letter
Number；
Signal condition unit, for being amplified and filtering process to sampled signal；And
Power amplification unit, is amplified and phase only pupil filter to the sampled signal through signal processing unit processes, with
To identical with the amplitude of the leakage current signal being sampled and opposite in phase current signal.
Preferably, wherein said normalized current source unit includes voltage acquisition unit, to described on-Line Monitor Device
The voltage transformer secondary side voltage that voltage sensor is associated is acquired, and the data gathering are converted into data signal.
Preferably, wherein said normalized current source unit includes controller, when being used for the standard according to gps clock output
Data signal is converted to current signal by D/A conversion unit by sequence.
Preferably, wherein said normalized current source unit includes power amplification unit, current signal is amplified and
Incidence relation between current signal and voltage transformer secondary side voltage signal is set, then by regulation power amplification unit
Multiplication factor and phase place, output generates amplitude and the controlled standard current signal of phase place.
According to a further aspect in the invention, a kind of calibration steps is provided, for the online prison to capacitive apparatus insulated parameter
Surveying device to calibrate, described calibration steps includes：
The leakage current signal of described on-Line Monitor Device is sampled to obtain sampled signal, to described sampled signal
Carry out processing that the amplitude of the leakage current signal to obtain and to be sampled is identical and the current signal of opposite in phase；
The current measurement that identical for described amplitude and opposite in phase current signal accesses described on-Line Monitor Device is returned
Road；And
Generate amplitude and the controlled standard current signal of phase place, with under electric field live state to described online prison
Survey device to verify.
Preferably, wherein said calibration steps also includes：
Sampled signal is amplified and filtering process；And
Sampled signal through signal processing unit processes is amplified and phase only pupil filter, to obtain and letting out of being sampled
The amplitude of leakage current signal is identical and the current signal of opposite in phase.
Preferably, wherein said calibration steps also includes：
The voltage transformer secondary side voltage being associated with the voltage sensor of described on-Line Monitor Device is acquired,
And the data gathering are converted into data signal.
Preferably, wherein said calibration steps also includes：
It according to the standard time sequence of gps clock output, is current signal by data signal digital-to-analogue conversion.
Preferably, wherein said calibration steps also includes：
Current signal is amplified and is arranged the pass between current signal and voltage transformer secondary side voltage signal
Connection relation, then by regulating the multiplication factor of power amplification unit and phase place, output generates amplitude and the controlled standard of phase place
Current signal.
Brief description
By reference to the following drawings, the illustrative embodiments of the present invention can be more fully understood by：
Fig. 1 is the structural representation of the calibration system according to embodiment of the present invention；
Fig. 2 is the structural representation of the calibration system according to another embodiment of the present invention；
Fig. 3 is the structural representation of the image current source unit according to embodiment of the present invention；
Fig. 4 is the structural representation for the normalized current source unit according to embodiment of the present invention；And
Fig. 5 is the flow chart of the calibration steps according to embodiment of the present invention.
Detailed description of the invention
With reference now to accompanying drawing, introduce the illustrative embodiments of the present invention, but, the present invention can be by many different shapes
Formula is implemented, and is not limited to embodiment described herein, provides these embodiments to be at large and fully disclose
The present invention, and the scope of the present invention is fully passed on to person of ordinary skill in the field.For representing showing in the accompanying drawings
Term in example embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements uses identical attached
Figure mark.
Unless otherwise stated, person of ordinary skill in the field is had by term used herein (including scientific and technical terminology)
Common understand implication.Further it will be understood that the term limiting with the usual dictionary using, it should it is understood to 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 structural representation of the calibration system according to embodiment of the present invention.As it is shown in figure 1, calibration system 100 is wrapped
Include：The on-Line Monitor Device 102 (that is, by school on-Line Monitor Device) of calibrator (-ter) unit the 101st, capacitive apparatus insulated parameter, capacitive set
Standby 103 etc..Preferably, it is existing at electric power that calibration system 100 can efficiently solve capacitive apparatus insulated parameter on-line monitoring device
It is difficult to the technical barrier effectively verifying under the live state of field.Calibration system 100 exports electric current simultaneously by measuring capacitive apparatus 103
Inject and its equal in magnitude and opposite in phase compensation electric current so that the operating magnetic field flux of capacitive apparatus 103 current measurement circuit connects
Nearly zero.Calibration system 100 passes through superposition amplitude and the controlled normalized current of phase place, it is achieved right under electric field live state
Effective verification of capacitive apparatus insulated parameter on-line monitoring device.
As it is shown in figure 1, calibration system 100 is by having the calibration of the measurement circuital amplitude of capacitive apparatus and phase bit function
Equipment 101 provides equal with flowing through capacitive apparatus 103 size of current and opposite in phase compensation electric current, and by equal in magnitude and
The compensation electric current of opposite in phase is injected in capacitive apparatus working current loop so that capacitive apparatus 103 operating magnetic field flux now
Close to zero, to realize the purpose allowing capacitive apparatus indicating value reset.
Wiring diagram as shown in Figure 1 is attached operation, accesses indicating value clearing electricity consumption at capacitive apparatus 103 punching line and spreads
Sensor, and access indicating value clearing loop, after completing aforesaid operations, the electric current output of regulation calibrator (-ter) unit 101, by observing capacitive
Equipment indicating value exports, when capacitive apparatus total current indicating value is close to zero (or being less than 0.1mA), it is believed that complete capacitive apparatus 103
Indicating value clear operation.Preferably, calibrator (-ter) unit 101 and the on-Line Monitor Device 102 of capacitive apparatus insulated parameter form electric current
Measurement loop, for verifying to on-Line Monitor Device 102.As it is shown in figure 1, the voltage input end of calibrator (-ter) unit 101 and electricity
Pressure transformer PT secondary side connects, and is used for input reference voltage.The current input terminal of calibrator (-ter) unit 101 is with current sensor even
Connect, so that leakage current signal is sampled.The current output terminal that compensates of calibrator (-ter) unit 101 is used for output and the leakage being sampled
The amplitude of current signal is identical and the current signal of opposite in phase.The test current output of calibrator (-ter) unit 101 generates amplitude
The standard current signal controlled with phase place, and access described online prison by parallel for standard current signal controlled to amplitude and phase place
Survey in the current measurement circuit of device.
The reference voltage that check system exports with voltage transformer pt secondary side is as reference, and output amplitude, phase place are controlled
Code test electric current, electric current output lead seals in by school on-Line Monitor Device punching current sensor input loop, it is achieved right
The isoparametric calibration of the total current of capacitive apparatus insulated parameter on-line monitoring device, dielectric dissipation factor, capacitance.
Preferably, calibrator (-ter) unit 101 is for calibrating to the on-Line Monitor Device of capacitive apparatus insulated parameter.Calibration sets
Standby 101 include：Image current source unit (not shown in figure 1) and normalized current source unit (not shown in figure 1).Wherein, mirror image
Current source cell, forms current measurement circuit with described on-Line Monitor Device, the leakage current letter to described on-Line Monitor Device
It number is sampled to obtain sampled signal, carry out to described sampled signal processing with the leakage current signal that obtains and sampled
Amplitude is identical and the current signal of opposite in phase, and identical for described amplitude and opposite in phase current signal is accessed institute
State the current measurement circuit of on-Line Monitor Device.Preferably, the controlled standard electric of normalized current source unit, generation amplitude and phase place
Stream signal, in the in parallel current measurement circuit accessing described on-Line Monitor Device, to described under electric field live state
On-Line Monitor Device verifies.
Preferably, image current source unit includes：Pincerlike sensor (not shown in figure 1), signal condition unit are (in Fig. 1
Not shown) and power amplification unit (not shown in figure 1).Preferably, pincerlike sensor, for described on-Line Monitor Device
Leakage current signal be sampled to obtain sampled signal.Preferably, signal condition unit, for putting to sampled signal
Big and filtering process.Preferably, power amplification unit, is amplified and phase to the sampled signal through signal processing unit processes
Position is revised, and the amplitude of the leakage current signal to obtain and to be sampled is identical and the current signal of opposite in phase.
Preferably, wherein normalized current source unit includes：Voltage acquisition unit, wireless transmitting unit, radio receiving unit,
Gps clock unit, controller, D/A conversion unit and power amplification unit (all not shown in Fig. 1).Preferably, voltage is adopted
Collection unit, is acquired to the voltage transformer secondary side voltage being associated with the voltage sensor of described on-Line Monitor Device,
And the data gathering are converted into data signal.Preferably, wireless transmitting unit is for being sent to wireless receiving by data signal
Unit.Preferably, radio receiving unit is for receiving data signal from wireless transmitting unit.Preferably, gps clock unit is used for
Output clock sequence.Preferably, data signal, for the standard time sequence according to gps clock output, is turned by controller by digital-to-analogue
Changing cell translation is current signal.Preferably, D/A conversion unit is used for converting digital signals into current signal.Preferably,
Power amplification unit, is amplified and arranges to current signal between current signal and voltage transformer secondary side voltage signal
Incidence relation, then by regulating the multiplication factor of power amplification unit and phase place, output generates amplitude and phase place is controlled
Standard current signal.
Preferably, the circuit that the on-Line Monitor Device 102 of capacitive apparatus insulated parameter and capacitive apparatus run forms measurement
Loop, for measuring the insulation parameter of capacitive apparatus.As it is shown in figure 1, the on-Line Monitor Device 102 of capacitive apparatus insulated parameter
Voltage input end be connected with voltage transformer pt secondary side, be used for input reference voltage.Capacitive apparatus insulated parameter online
The current input terminal of monitoring device 102 is connected with current sensor.Wherein current sensor flows through capacitive apparatus for measurement
Circuit.Additionally, the primary side of capacitive apparatus and voltage transformer pt is all connected with bus.Preferably, the capacitive apparatus other end leads to
Cross impedance ground ground connection.
Preferably, capacitive apparatus 103 can include current sensor, sleeve pipe, coupling electric capacity, capacitance type potential transformer
Deng.In power system, capacitive apparatus acts primarily as the effects such as power back-off, rectifying and wave-filtering and overvoltage protection.Capacitor performance
Quality be directly connected to the properly functioning of electrical network.Owing in high voltage electric equipment damage accident, major part is that insulation damages causes
, therefore the existing defects of discovery insulation timely and effectively is significant for guarantee power grid security.
Fig. 2 is the structural representation of the calibration system 200 according to another embodiment of the present invention.As in figure 2 it is shown, logic
On, system of calibrating under insulation parameter on-Line Monitor Device site environment is powered by sensor, power supply and manages parts, transducing signal
Collection and transmission part, normalized current source and image current source block four part composition.The general principle of calibration system 200
It is：Complete the work(such as current measurement, current analog and normalized current output by image current source block and normalized current source block
Energy.Reference voltage signal source is arranged on the PT secondary side of voltage sensor, and current signal is then taked first to offset original leakage electricity
Stream signal, reinjects the mode of standard current signal.That is, first pass through image current parts to survey at capacitive apparatus current sensor
In amount circuit, injection one is identical with leakage current amplitude, and the current signal of opposite in phase, in order to offset in original measurement circuitry
Current signal.Then, the PT secondary voltage of test product voltage sensor monitoring is measured, according to voltage measurements at test product electric current
Sensor measurement circuit reinjects a phase place related to test product voltage signal, amplitude can the current signal of on-demand regulation,
Again the electric current that surveyed for capacitive apparatus insulated on-Line Monitor Device current value and normalized current source export is analyzed, is given
Check results.
As in figure 2 it is shown, calibration system 200 includes：Calibrator (-ter) unit the 201st, insulation parameter on-Line Monitor Device the 202nd, capacitive sets
Standby 203rd, voltage transformer 204.Preferably, calibration system 200 can efficiently solve capacitive apparatus insulated parameter online
Device is difficult to the technical barrier effectively verifying under electric field live state.Calibration system 200 is by measurement capacitive apparatus
203 output electric currents simultaneously inject and its equal in magnitude and opposite in phase compensation electric current so that capacitive apparatus 203 current measurement circuit
Operating magnetic field flux close to zero.Calibration system 200 passes through superposition amplitude and the controlled normalized current of phase place, it is achieved in electric field not
Effective verification to insulation parameter on-Line Monitor Device under power down mode.
As in figure 2 it is shown, calibration system 200 is by having the calibrator (-ter) unit 201 of the circuital amplitude of measurement and phase bit function
Provide equal with flowing through capacitive apparatus 203 size of current and opposite in phase compensation electric current, and by equal in magnitude and phase place phase
Anti-compensation electric current is injected in capacitive apparatus working current loop so that capacitive apparatus 203 operating magnetic field flux now close to zero,
To realize the purpose allowing capacitive apparatus indicating value reset.
Wiring diagram as shown in Figure 2 is attached operation, accesses indicating value clearing electricity consumption at capacitive apparatus 203 punching line and spreads
Sensor, and access indicating value clearing loop, after completing aforesaid operations, the electric current output of regulation calibrator (-ter) unit 201, by observing capacitive
Equipment indicating value exports, when capacitive apparatus total current indicating value is close to zero (or being less than 0.1mA), it is believed that complete capacitive apparatus 203
Indicating value clear operation.Preferably, calibrator (-ter) unit 201 and insulation parameter on-Line Monitor Device 202 form current measurement circuit, use
In on-Line Monitor Device 202 is verified.As it is shown in figure 1, the voltage input end of calibrator (-ter) unit 201 and voltage transformer pt two
Secondary side connects, and is used for input reference voltage.The current input terminal of calibrator (-ter) unit 201 is connected with current sensor, with to leakage electricity
Stream signal is sampled.The width compensating the leakage current signal for exporting and being sampled for the current output terminal of calibrator (-ter) unit 201
It is worth identical and opposite in phase current signal.The test current output of calibrator (-ter) unit 201 generates amplitude and phase place is controlled
Standard current signal, and by the electric current accessing described on-Line Monitor Device in parallel for standard current signal controlled to amplitude and phase place
In measurement loop.
The reference voltage that check system exports with voltage transformer pt secondary side is as reference, and output amplitude, phase place are controlled
Code test electric current, electric current output lead seals in by school on-Line Monitor Device punching current sensor input loop, it is achieved right
The isoparametric calibration of the total current of insulation parameter on-Line Monitor Device, dielectric dissipation factor, capacitance.
Preferably, calibrator (-ter) unit 201 is for calibrating to insulation parameter on-Line Monitor Device.Calibrator (-ter) unit 101 includes：
Image current source unit (not shown in Fig. 2) and normalized current source unit (not shown in Fig. 2).Wherein, image current source unit,
Form current measurement circuit with described on-Line Monitor Device, the leakage current signal of described on-Line Monitor Device is sampled with
Obtain sampled signal, carry out to described sampled signal processing the amplitude of the leakage current signal to obtain and to be sampled identical and
The current signal of opposite in phase, and identical for described amplitude and opposite in phase current signal is accessed described on-line monitoring dress
The current measurement circuit put.Preferably, the controlled standard current signal of normalized current source unit, generation amplitude and phase place, in parallel
Access in the current measurement circuit of described on-Line Monitor Device, to described on-Line Monitor Device under electric field live state
Verify.
Preferably, image current source unit includes：Pincerlike sensor the 204th, signal condition unit 205 and power amplification list
Unit (not shown in Fig. 2).Preferably, pincerlike sensor 204, for carrying out to the leakage current signal of described on-Line Monitor Device
Sampling is to obtain sampled signal.Preferably, signal condition unit 205, for being amplified and filtering process to sampled signal.Excellent
Selection of land, power amplification unit, the sampled signal through signal processing unit processes is amplified and phase only pupil filter, with obtain with
The amplitude of the leakage current signal being sampled is identical and the current signal of opposite in phase.
Preferably, wherein normalized current source unit includes：Voltage acquisition unit the 206th, wireless transmitting unit is the 211st, wireless to be connect
Receive unit the 212nd, gps clock unit the 207th, controller the 208th, D/A conversion unit 209 and power amplification unit 210.Preferably,
Voltage acquisition unit 206, to the voltage transformer secondary side voltage being associated with the voltage sensor of described on-Line Monitor Device
It is acquired, and the data gathering are converted into data signal.Preferably, wireless transmitting unit 211 is for sending out data signal
Give radio receiving unit.Preferably, radio receiving unit 212 is for receiving data signal from wireless transmitting unit.Preferably,
Gps clock unit 207 is used for exporting clock sequence.Preferably, controller 208, for according to gps clock unit 207 output
Data signal is converted to current signal by D/A conversion unit by standard time sequence.Preferably, D/A conversion unit 209 is used for
Convert digital signals into current signal.Preferably, power amplification unit 210, are amplified to current signal and arrange electricity
Incidence relation between stream signal and voltage transformer secondary side voltage signal, then by regulating the amplification of power amplification unit
The controlled standard current signal of multiple and phase place, output generation amplitude and phase place.
Preferably, the circuit that insulation parameter on-Line Monitor Device 202 and capacitive apparatus run forms measurement loop, for
The insulation parameter of measurement capacitive apparatus.As in figure 2 it is shown, the voltage input end of insulation parameter on-Line Monitor Device 202 is mutual with voltage
Sensor secondary side connects, and is used for input reference voltage.The current input terminal of insulation parameter on-Line Monitor Device 202 and current sense
Device connects.Wherein current sensor flows through the circuit of capacitive apparatus 203 for measurement.Additionally, capacitive apparatus 203 and mutual induction of voltage
The primary side of device is all connected with bus.Preferably, capacitive apparatus 203 other end is grounded by impedance ground.
Preferably, capacitive apparatus 203 can include current sensor, sleeve pipe, coupling electric capacity, capacitance type potential transformer
Deng.In power system, capacitive apparatus acts primarily as the effects such as power back-off, rectifying and wave-filtering and overvoltage protection.Capacitor performance
Quality be directly connected to the properly functioning of electrical network.Owing in high voltage electric equipment damage accident, major part is that insulation damages causes
, therefore the existing defects of discovery insulation timely and effectively is significant for guarantee power grid security.
Fig. 3 is the structural representation of the image current source unit 300 according to embodiment of the present invention.As it is shown on figure 3, mirror image
Current source cell 300 includes：Pincerlike sensor the 301st, signal condition unit 302 and power amplification unit 303.Preferably, pincerlike
Sensor 301, for being sampled to the leakage current signal of described on-Line Monitor Device to obtain sampled signal.Preferably,
Signal condition unit 302, for being amplified and filtering process to sampled signal.Preferably, power amplification unit 303, to warp
The sampled signal crossing signal processing unit processes is amplified and phase only pupil filter, with the leakage current signal that obtains and sampled
Amplitude is identical and the current signal of opposite in phase.
Preferably, image current source unit 300 first passes through pincerlike sensor 301 to insulation parameter on-Line Monitor Device
Leakage current is sampled, to obtain Weak current signal.Then, signal condition unit 302 being obtained to pincerlike sensor 301
The Weak current signal taking is amplified and filtering process, to obtain the current signal through amplifying and filtering is processed.Then, work(
Rate amplifying unit 303 is amplified the current signal through amplifying and after the current signal process of filtering process and phase place is repaiied
Just, to obtain and phase 180 ° (phase place phases identical with the signal amplitude of the leakage current that pincerlike sensor 301 is sampled
Signal instead).
Preferably, image current source unit 300 according to the size of the leakage current of capacitive apparatus can select 10mA and
100mA shelves so that current range is from 0.5mA～120mA.Preferably, the material of the iron core of pincerlike sensor 301 is permalloy
And the material of shell is ABS resin.Preferably, the design parameter of pincerlike sensor 301 is it may be that for example, current measurement model
Enclose：AC1 μ A～50A, nominal transformer ratio：2400：1, CT bore：φ 37mm, is suitable for frequency：45Hz～65Hz, uses environment temperature
Degree：-10 DEG C～50 DEG C.
Fig. 4 is the structural representation for the normalized current source unit 400 according to embodiment of the present invention.As shown in Figure 4, mark
Quasi-current source cell 400 includes：Voltage acquisition unit the 401st, wireless transmitting unit the 402nd, radio receiving unit the 403rd, gps clock list
Unit the 404th, controller the 405th, D/A converting unit 406 and power amplification unit 407.Preferably, voltage acquisition unit 401, to
The voltage transformer secondary side voltage that the voltage sensor of described on-Line Monitor Device is associated is acquired, and the number gathering
According to being converted into data signal.Preferably, wireless transmitting unit 402 is for being sent to radio receiving unit by data signal.Preferably
Ground, radio receiving unit 403 is for receiving data signal from wireless transmitting unit.Preferably, gps clock unit 404 is used for defeated
Go out clock sequence.Preferably, data signal, for the standard time sequence according to gps clock unit 404 output, is led to by controller 405
Cross D/A conversion unit and be converted to current signal.Preferably, D/A conversion unit 406 is used for converting digital signals into electric current letter
Number.Preferably, power amplification unit 407, are amplified and arrange current signal and voltage transformer secondary to current signal
Incidence relation between the voltage signal of side, then by regulating multiplication factor and the phase place of power amplification unit, output generates width
The value standard current signal controlled with phase place.
Preferably, the working method of the normalized current module of normalized current source unit 400 is：First pass through voltage acquisition list
The voltage transformer secondary side voltage that the voltage sensor that capacitive apparatus insulated on-Line Monitor Device is connected by unit 401 is associated enters
Row gathers, and gathers data and is converted into data signal, then by wireless transmitting unit 402, data signal is sent to wireless receiving list
Unit 403.The standard time sequence that the data signal receiving is exported by controller 405 by gps clock unit 404, is inputted digital-to-analogue
Converting unit 406 is to be converted to analog signal.Then, analog signal is input to power amplification unit 407, power amplification unit
There is specific incidence relation between the current signal of 407 outputs and PT secondary side voltage signal.Finally, put by regulating power
The multiplication factor of big unit 407 and phase place, i.e. exportable required current signal.Preferably, the main ginseng of normalized current source unit
Number is：Voltage measurement scope：50V～120V, current amplitude output area：1mA～10mA, and angle output area：0 °～
90°.
Fig. 5 is the flow chart of the calibration steps 500 according to embodiment of the present invention.As it is shown in figure 5, calibration steps 500 can
To efficiently solve what capacitive apparatus insulated parameter on-line monitoring device was difficult to effectively to verify under electric field live state
Technical barrier.Calibration steps 500 is by measurement capacitive apparatus output electric current and injects and its equal in magnitude and opposite in phase benefit
Repay electric current so that the operating magnetic field flux of capacitive apparatus current measurement circuit is close to zero.Calibration steps 500 passes through superposition amplitude and phase place
Controlled normalized current, it is achieved effective to capacitive apparatus insulated parameter on-line monitoring device under electric field live state
Verification.
Preferably, calibration steps 500 is from the beginning of step 501 place.
In step 501, the leakage current signal of described on-Line Monitor Device is sampled to obtain sampled signal, to institute
State sampled signal and carry out processing that the amplitude of the leakage current signal to obtain and to be sampled is identical and the electric current letter of opposite in phase
Number.
In step 502, identical for described amplitude and opposite in phase current signal is accessed described on-Line Monitor Device
Current measurement circuit.
In step 503, generate amplitude and the controlled standard current signal of phase place, with right under electric field live state
Described on-Line Monitor Device verifies.
Preferably, calibration steps 500 also includes：Sampled signal is amplified and filtering process；And to through signal
The sampled signal of processing unit processes is amplified and phase only pupil filter, the amplitude phase of the leakage current signal to obtain and to be sampled
With and the current signal of opposite in phase.
Preferably, calibration steps 500 also includes：To the voltage being associated with the voltage sensor of described on-Line Monitor Device
Transformer secondary side voltage is acquired, and the data gathering are converted into data signal.
Preferably, calibration steps 500 also includes：According to the standard time sequence of gps clock output, by data signal digital-to-analogue conversion
For current signal.
Preferably, calibration steps 500 also includes：It is amplified and arranges current signal and mutual induction of voltage to current signal
Incidence relation between device secondary side voltage signal, then by regulating multiplication factor and the phase place of power amplification unit, output
Generate amplitude and the controlled standard current signal of phase place.
By describing the present invention with reference to a small amount of embodiment.But, known in those skilled in the art, as
Subsidiary Patent right requirement is limited, except the present invention other embodiment disclosed above equally falls the present invention's
In the range of.
Normally, all terms using in the claims are all solved in the usual implication of technical field according to them
Release, unless additionally defined clearly wherein.All of reference " one/described/be somebody's turn to do [device, assembly etc.] " is all opened ground
It is construed at least one example in described device, assembly etc., unless otherwise expressly specified.Any method disclosed herein
Step all need not be run with disclosed order accurately, unless explicitly stated otherwise.
Claims (10)
1. a calibrator (-ter) unit, for the on-Line Monitor Device of capacitive apparatus insulated parameter is calibrated, described calibrator (-ter) unit
Including：
Image current source unit, forms current measurement circuit with described on-Line Monitor Device, lets out described on-Line Monitor Device
Leakage current signal is sampled to obtain sampled signal, carries out to described sampled signal processing the leakage electricity to obtain and to be sampled
Stream signal amplitude is identical and the current signal of opposite in phase, and by identical for described amplitude and opposite in phase electric current letter
Number access the current measurement circuit of described on-Line Monitor Device；And
The controlled standard current signal of normalized current source unit, generation amplitude and phase place, the described on-Line Monitor Device of access in parallel
Current measurement circuit in, under electric field live state, described on-Line Monitor Device is verified.
2. calibrator (-ter) unit according to claim 1, wherein said image current source unit includes：
Pincerlike sensor, for being sampled to the leakage current signal of described on-Line Monitor Device to obtain sampled signal；
Signal condition unit, for being amplified and filtering process to sampled signal；And
Power amplification unit, is amplified and phase only pupil filter to the sampled signal through signal processing unit processes, with obtain with
The amplitude of the leakage current signal being sampled is identical and the current signal of opposite in phase.
3. calibrator (-ter) unit according to claim 1, wherein said normalized current source unit includes voltage acquisition unit, to
The voltage transformer secondary side voltage that the voltage sensor of described on-Line Monitor Device is associated is acquired, and the number gathering
According to being converted into data signal.
4. calibrator (-ter) unit according to claim 1, wherein said normalized current source unit includes controller, for according to
Data signal is converted to current signal by D/A conversion unit by the standard time sequence of gps clock output.
5. calibrator (-ter) unit according to claim 1, wherein said normalized current source unit includes power amplification unit, to electricity
Stream signal is amplified and arranges the incidence relation between current signal and voltage transformer secondary side voltage signal, then leads to
Overregulating multiplication factor and the phase place of power amplification unit, output generates amplitude and the controlled standard current signal of phase place.
6. a calibration steps, for the on-Line Monitor Device of capacitive apparatus insulated parameter is calibrated, described calibration steps
Including：
The leakage current signal of described on-Line Monitor Device is sampled to obtain sampled signal, described sampled signal is carried out
Process that the amplitude of leakage current signal to obtain and to be sampled is identical and the current signal of opposite in phase；
Identical for described amplitude and opposite in phase current signal is accessed the current measurement circuit of described on-Line Monitor Device；With
And
Generate amplitude and the controlled standard current signal of phase place, to fill described on-line monitoring under electric field live state
Put and verify.
7. calibration steps according to claim 1, wherein said calibration steps also includes：
Sampled signal is amplified and filtering process；And
Sampled signal through signal processing unit processes is amplified and phase only pupil filter, with the leakage electricity obtaining and being sampled
Stream signal amplitude is identical and the current signal of opposite in phase.
8. calibration steps according to claim 1, wherein said calibration steps also includes：
The voltage transformer secondary side voltage being associated with the voltage sensor of described on-Line Monitor Device is acquired, and
The data gathering are converted into data signal.
9. calibration steps according to claim 1, wherein said calibration steps also includes：
It according to the standard time sequence of gps clock output, is current signal by data signal digital-to-analogue conversion.
10. calibration steps according to claim 1, wherein said calibration steps also includes：
Current signal is amplified and associating between current signal with voltage transformer secondary side voltage signal is set
System, then by regulating the multiplication factor of power amplification unit and phase place, output generates amplitude and the controlled normalized current of phase place
Signal.
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Application publication date: 20170222 |