CN107238811A - The calibrating installation of ultrahigh frequency partial discharge on-Line Monitor Device under a kind of site environment - Google Patents
The calibrating installation of ultrahigh frequency partial discharge on-Line Monitor Device under a kind of site environment Download PDFInfo
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- CN107238811A CN107238811A CN201710413263.9A CN201710413263A CN107238811A CN 107238811 A CN107238811 A CN 107238811A CN 201710413263 A CN201710413263 A CN 201710413263A CN 107238811 A CN107238811 A CN 107238811A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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Abstract
The invention discloses a kind of calibrating installation of ultrahigh frequency partial discharge on-Line Monitor Device under site environment, including tested on-Line Monitor Device, the measurement module for being tested sensor, measurement host, signal generator and measurement criteria；Tested sensor is arranged in tested on-Line Monitor Device；Tested sensor is connected with measurement host；The measurement module of measurement criteria is connected by RF cable with tested sensor；Signal generator is connected to inject uhf electromagnetic wave signal to tested sensor with tested sensor；Measurement host obtains the tested response signal of tested on-Line Monitor Device；Measurement module obtains the normal response signal of tested sensor；Measurement host generates calibration result according to the normal response signal of acquisition and tested response signal.The calibrating installation that the present invention is provided；Calibration efficiency is improved, human error is reduced；Calibration data confidence level is improved, the influences of the factor to test such as distributed constant, connection reliability degree, external interference that frequent line is introduced are reduced.
Description
Technical field
The present invention relates to power network on-site detecting device field, more particularly to be that ultrahigh frequency partial discharge exists under a kind of site environment
The calibrating installation of line monitoring device.
Background technology
In power generation industry, used general purpose test equipment has the input/output interface of standard, there is corresponding meter
Vertification regulation or calibrating standard are measured, is comparatively easier to realize the automation of calibrating or calibration.And surveyed for special
Equipment is tried, the automation difficulty of calibration is realized than larger, matter of utmost importance is that special test equipment neither one is unified
Standard interface, existing on-Line Monitor Device being typically different being proofread as may have been used different test interfaces for producer, giving
Calibration test work brings inconvenience, and one is that connecting interface model is more, and interface function is different, and often locating interface will
Treat with a certain discrimination, waste time and energy；Two be that test parameter is more, and the standard device being related to is more, may often be changed in calibration process
Test equipment, sometimes operation needs many people to coordinate completion；Three be that test data is more, and data communication standard differs, to different by school
Equipment may need to design different communication interfaces, use different communications protocol.
It is many at this stage to be represented using collection of illustrative plates, the characteristic of shelf depreciation can be partly reflected using collection of illustrative plates, and functionally push away
Disconnected shelf depreciation situation, but collection of illustrative plates lacks the effect of quantitative response shelf depreciation.The essence of hyperfrequency method measurement of partial discharge
It is electromagnetic wave of the measurement in GIS internal communications.Due to GIS internal structure reason, the decay of electromagnetic wave and its propagation path are each
Different, built-in, external sensor different properties, therefore it can not be carried out using the method for setting up standard electric field environment (GTEM)
Calibration.In order to solve this problem, employ and sensor output value is measured, and combine on-Line Monitor Device main frame and carry out
Calibration method, the value accuracy of comprehensive descision hyperfrequency method local discharge on-line monitoring device.
High-frequency local discharging on-Line Monitor Device metrological standard unit is to be directed to superelevation under site environment under site environment
Metrological standard unit designed by frequency on-Line Monitor Device.By field calibration environment is limited, metrological standard unit need to be met just
Taking miniaturization etc. is required, accordingly, it would be desirable to design a set of be directed under high-frequency local discharging on-Line Monitor Device site environment
Metrological standard unit.The designing points of high-frequency local discharging on-Line Monitor Device metrological standard unit are under site environment
Can also be to the main performance and ginseng of the high-frequency local discharging on-Line Monitor Device under site environment while small-sized, portability
Number index is calibrated.
Accordingly, it would be desirable to the ultrahigh frequency partial discharge on-Line Monitor Device calibrating installation under a kind of site environment.
The content of the invention
The purpose of the present invention is to propose to a kind of calibrating installation of ultrahigh frequency partial discharge on-Line Monitor Device under site environment；The dress
Putting can realize ultrahigh frequency partial discharge on-Line Monitor Device is calibrated under environment at the scene.
The purpose of the present invention is achieved through the following technical solutions：
The calibrating installation of ultrahigh frequency partial discharge on-Line Monitor Device under the site environment that the present invention is provided, the tested sensor
It is arranged in tested on-Line Monitor Device；The tested sensor is connected with measurement host；
The measurement module of the measurement criteria is connected by RF cable with tested sensor；
The signal generator is connected to inject uhf electromagnetic wave signal to tested sensor with tested sensor；
The measurement host obtains the tested response signal of tested on-Line Monitor Device；
The measurement module of the measurement host and measurement criteria connects to obtain the normal response signal of tested sensor；
The measurement host generates calibration result according to the normal response signal of acquisition and tested response signal.
Further, the tested sensor includes the built-in type UHF sensor being arranged on GIS device pipeline；In described
Put formula type UHF sensor and acquisition monitoring response signal is input to measurement host.
Further, the tested sensor includes the externally positioned type type UHF sensor being arranged on GIS device pipeline；The letter
The test signal that signal generator is generated is injected into externally positioned type type UHF sensor by number amplifier.
Further, the signal generator comes real to tested sensor injection uhf electromagnetic wave signal according to following steps
It is existing：
The amplitude of the output signal of Regulate signal generator makes the indicator of output signal reach full scale；Write down output letter
Number crest voltage U and indicator full scale value A；
Change the crest voltage of output signal successively, write down the corresponding crest voltage and indicator scale of output signal
Value；
The nonlinearity erron in each measurement point is calculated according to below equation：
In formula：ε is the linear relative error of detector amplitude measurement；λ is that amplitude changes ratio.
Further, the signal generator is that module occurs for radiofrequency signal.
Further, UHF electromagnetic wave signal couplers, the UHF electromagnetic waves letter are arranged at intervals with the GIS device inside
Number coupler is connected with built-in type UHF sensor successively.
Further, the external hyperfrequency type UHF sensor be installed on GIS device pipeline reserve plug hole benzvalene form it is exhausted
On the outside of edge.
By adopting the above-described technical solution, the present invention has the advantage that：
The calibrating installation of ultrahigh frequency partial discharge on-Line Monitor Device under the site environment that the present invention is provided；Improve calibration
Efficiency, reduces human error；Calibration data confidence level is improved, distributed constant, connection reliability journey that frequent line is introduced is reduced
Influence of the factors such as degree, external interference to test；Reduction test risk, reduces the possibility that artificial connection error causes device damage
Property, ensure equipment availability；It is easy to develop unified calibration interface, and by the magnitude tracing system of calibration equipment.
Other advantages, target and the feature of the present invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.The present invention target and other advantages can be realized by following specification and
Obtain.
Brief description of the drawings
The brief description of the drawings of the present invention is as follows.
Fig. 1 is the calibration method flow chart of ultrahigh frequency partial discharge on-Line Monitor Device under site environment.
Fig. 2 is the calibrating installation structure chart of ultrahigh frequency partial discharge on-Line Monitor Device under site environment.
Fig. 3 is that modular system block diagram occurs for radiofrequency signal.
Fig. 4 is the circuit that AD9856 produces modulated signal.
Fig. 5 is MAX2671 circuits.
Fig. 6 is RF local oscillator signal circuit block diagram.
Fig. 7 is MAX2750 circuit diagrams.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Embodiment 1
As illustrated, the present embodiment provide a kind of site environment under ultrahigh frequency partial discharge on-Line Monitor Device calibration cartridge
Put, the tested sensor is arranged in tested on-Line Monitor Device；The tested sensor is connected with measurement host；
The measurement module of the measurement criteria is connected by RF cable with tested sensor；
The signal generator is connected to inject uhf electromagnetic wave signal to tested sensor with tested sensor；
The measurement host obtains the tested response signal of tested on-Line Monitor Device；
The measurement module of the measurement host and measurement criteria connects to obtain the normal response signal of tested sensor；
The measurement host generates calibration result according to the normal response signal of acquisition and tested response signal.
The tested sensor includes the externally positioned type type UHF sensor being arranged on GIS device pipeline；And installed in GIS
Built-in type UHF sensor inside equipment pipe；The test signal for being generated signal generator by signal amplifier is noted
Enter to externally positioned type type UHF sensor；The built-in type UHF sensor will obtain monitoring response signal and be input to measurement host and be divided
Analysis is handled.
The signal generator is realized to tested sensor injection uhf electromagnetic wave signal according to following steps：
The amplitude of the output signal of Regulate signal generator makes the indicator of output signal reach full scale；Write down output letter
Number crest voltage U and indicator full scale value A；
Change the crest voltage of output signal successively, write down the corresponding crest voltage and indicator scale of output signal
Value；
The nonlinearity erron in each measurement point is calculated according to below equation：
In formula：ε is the linear relative error of detector amplitude measurement；λ is that amplitude changes ratio.
The signal generator is that module occurs for radiofrequency signal.
UHF electromagnetic wave signal couplers, the UHF electromagnetic wave signals coupling are arranged at intervals with the GIS device inside
Device is connected with built-in type UHF sensor successively.
The external hyperfrequency type UHF sensor is installed on outside the disc insulator that plug hole is reserved on GIS device pipeline
Side.
Embodiment 2
The calibrating installation of ultrahigh frequency partial discharge on-Line Monitor Device under the site environment that the present embodiment is provided, using to sensor
Output valve is measured, and combines the standard signal of the measurement host of on-Line Monitor Device, and comprehensive descision hyperfrequency method is locally put
The value of electric on-Line Monitor Device.The device volume is small to be easy to carry, while can also be local to the hyperfrequency under site environment
The main performance and parameter index of On-line Discharge monitoring device are calibrated.Its signal injection mode has significant difference.
Hyperfrequency method shelf depreciation key parameters under site environment：GIS partial discharge on-line monitoring requires what is run in GIS
It is monitored under field condition, due to reasons such as corona discharges, there is substantial amounts of electromagnetic interference signal under field condition.Especially
Larger in the intensity of below 300MHz band interference signals, the sometimes interference of background may be put more than the part to be monitored
Electric signal so that the electric signal measurement of partial discharge monitoring can not be realized.When occurring shelf depreciation inside GIS, due to point of discharge
Locate the rapid transfer of electric charge, form duration very short electric pulse, and produce frequency component extremely abundant electromagnetic signal, it is high
Up to several GHz.UHF methods are exactly to utilize the ultrahigh frequency electromagnetic wave signal (300MHz~3GHz) given off for GIS partial discharge
A kind of method being monitored.UHF methods can use the antenna of appropriate frequency bands scope and be surveyed to carry out the electric signal of shelf depreciation
Amount, the method can avoid the interference in the power system that is difficult in conventional electrical method of testing, significantly improve local put
The signal to noise ratio of pyroelectric monitor, to reach the purpose of electromagnetism interference.
Therefore, the parameter of tracing to the source of hyperfrequency method measurement of partial discharge is the radiofrequency signal for injecting UHF antenna, is divided through comparing
Analysis, it is 50 ohm of radio system to use characteristic impedance, and the metrological standard unit needs for live on-Line Monitor Device meet
Following design requirement：Module occurs for radiofrequency signal：Waveform is sinusoidal signal/modulated signal；Sinusoidal (carrier wave) signal frequency range
300MHz~3GHz；Power amplifier gain 20dB；Signal output area -70dBm~+10dBm.
Hyperfrequency method local discharge sensor deployment scenarios are analyzed under site environment：
At the scene under environment, two major class high-frequency local discharging on-Line Monitor Device sensors are presently, there are on GIS pipelines
Installation method, i.e., built-in and external.External high-frequency local discharging on-Line Monitor Device sensor is to utilize GIS pipelines
Upper reserved plug hole, the sensor that electromagnetic horn is constituted is fixed on GIS pipeline disc insulators, antenna surface is put towards plug hole
Put, by plug hole, the uhf electromagnetic wave signal that shelf depreciation is supervened can reveal a part and come out, so as to be sensor
Captured, after being nursed one's health by a series of signal amplifier, the analysis of discharge characteristic amount is carried out in main frame.External sensor
Advantage be easy installation and removal, while can also be disassembled progress censorship work, due to GIS plug holes aperture very
It is small, although its wave impedance is much smaller than surrounding GIS metal pipe-walls, but the uhf electromagnetic wave signal leaked by plug hole is still
Only account for small proportion；In addition, the size of GIS plug holes does not force standard, each producer GIS pipeline plug holes at present
Size it is variant, this also cause by GIS pipelines plug hole leak electromagnetic wave value do not fix, the long side of plug hole
Length influences larger to signal amplitude.
What is be widely used on GIS pipelines is built-in sensor, built-in sensor at the beginning of GIS pipelines are produced just
It is already installed on inside pipeline, is monitored on-line and filled with outside high-frequency local discharging by default mounting hole on GIS pipelines
Main frame is put to be connected.Built-in sensor main advantage is that the signal intensity measured is higher, and this is due to the metal shell of GIS pipelines
Wave impedance is very big, and uhf electromagnetic wave signal is difficult to penetrate tube wall to propagate to the pipeline external space.
Hyperfrequency method shelf depreciation electromagnetic signal is analyzed under site environment：
GIS can be regarded as coaxial waveguide.In GIS coaxial cavities, the UHF electromagnetic wave signals of shelf depreciation are not only with transverse direction
Electromagnetic wave (TEM) mode is propagated, and can set up higher mode ripple, i.e. transverse electric wave (TE) and transverse magnetic wave (TM).
Wherein, TEM ripples are non-dispersive wave, can be in GIS cavitys with the propagation of any frequency.And TE and TM ripples are then different,
They have respective cut-off frequency.As the frequency f ＞ of electromagnetic wavecWhen, electromagnetic wave is substantially the loss-free biography in GIS
Broadcast, but as the frequency f ＜ of electromagnetic wavec, electromagnetic wave decays rapidly in communication process.
GIS coaxial waveguides：Inner wire (GIS high pressure guide rod) and outer conductor (GIS shells) are metallic conductor.It is wherein interior to lead
The radius of body is a；The radius of outer conductor is b.Dielectric material dielectric constant between internal and external conductor is that magnetic conductivity is.Then by
Frequency fcFor：
It can be seen that GIS sectional areas are bigger, fcIt is lower.By taking the domestic 220kV GIS of China as an example, a is 45mm, and b is 190mm,
Then fcFor 407MHz；It is respectively 62.5mm and 244mm, f for 500kV GIS, a and bcFor 312MHz.So using UHF side
Another advantage that method carries out GIS partial discharge on-line monitoring is exactly that the electromagnetic wave of superfrequency propagates basic in GIS inside cavities
It is loss-free.
Electromagnetic wave signal any point (a in GIS cavitys<x<B) maxwell equation group is met：
In formula：B=μ H；D=ε E；
Electromagnetic field in GIS pipelines is emulated using ANSYS, still, the equipment can not be removed from GIS pipelines,
It can not deliver to and be calibrated at the high-frequency local discharging on-Line Monitor Device STANDARD MEASURING APPARATUS FOR under laboratory environment.
Substantially, the uhf electromagnetic wave that shelf depreciation is supervened when occurring is only for magnetic distribution difference inside and outside GIS pipelines
It can be detected at built-in sensors or at the external sensor at plug hole.
Because external sensor has the advantage of convenient disassembly, therefore, the present embodiment emphasis is for installing built-in sensing
The high-frequency local discharging on-Line Monitor Device of device carries out metrological standard unit design, while taking into account the superelevation of external sensor
Frequency local discharge on-line monitoring device is accounted for；It is specific as follows：
Basic demand to built-in sensors is should not to damage GIS reliability service, it is impossible to leak insulating gas,
Internal field strength distribution is not influenceed, otherwise may cause insulation breakdown.For the GIS put into operation, outer sensor can be pacified
At the insulating flange for needing test position, the installation and detection of outer sensor are more flexible.Exist inside GIS device
During shelf depreciation, the UHF electromagnetic wave signals produced by shelf depreciation are along GIS device pipe transmmision, when reaching UHF coupled antennas
Signal is detected, and to be sent to GIS device external by high frequency cable joint.The UHF electromagnetic wave signals of shelf depreciation are set in GIS
There is decay during standby internal communication, it is allowed to which a UHF electromagnetic wave signals coupling is installed at spacing intervals on GIS device pipeline
Device, to ensure detection sensitivity.External hyperfrequency (UHF) sensor is installed on the outside of the disc insulator of GIS device, by work
Cheng personnel determine the installation site and the related size for installing annex of each sensor by site inspection.Because superelevation is kept pouring in
Sensor is actually a kind of radio-frequency antenna with reciprocity property, therefore can be used sensor as signal transmitting antenna.
When installing at the scene, installment work is completed using the good installation annex of pre-production.
Using the sensor (antenna) calibrated in laboratory environments as signal transmitting antenna under site environment, use
Signal generator and signal amplifier output signal to outer emission sensor (antenna), recommend unmodulated just using uhf band
String signal is used as output.The subject sensor of proximal most position is used for receiving the UHF of calibration as sensor (antenna) is received
Signal.
The calibration test carried out on GIS analog platforms：
Tested sensor and the connection of IED or measurement host are kept first, and equal proportion reduces the amplitude of Injection Signal, from
Display interface reads response Vb of the tested on-Line Monitor Device to steady-state field, and records one group of indicating value.Then injection is kept
Radiofrequency signal is constant, then disconnects the electrical connection of tested sensor and IED or measurement host, and using 50 Ω radio frequency line
Cable is connected to the measurement module of measurement criteria, to obtain voltage responsive VS of the tested sensor to stable state rf electric field intensity, and
Record one group of reference value.This 2 class value is converted into quantic from logarithmic form, the contrast of the amplitude linearity is carried out.
In summary, the metrological standard unit for live on-Line Monitor Device needs to meet following design requirement：
Module occurs for radiofrequency signal：Waveform is sinusoidal signal/modulated signal；Sinusoidal (carrier wave) signal frequency range 300MHz
~3GHz；Power amplifier gain 20dB；Signal output area -70dBm~+10dBm.
The signal modulation circuit of module occurs for radiofrequency signal.Signal modulation circuit is FPGA circuitry design use first
The EP1C20 chips of ALTERA companies, with VHDL programming realizations by man-machine interface output control information, then by control information pair
The signal to be produced is answered, AD9856 is output a signal to.AD9856 is 12 products of a monolithic mixed signal of ADI companies
Fraction word up-converter, sampling rate is 200MSPS, produce 80MHz numeral output and 80dB arrowbands without spurious signal
Dynamic range.AD9856 has 200MHz internal clocking, 4~20 times of programmable clock frequencys multiplication of integrated belt lock indicator
Device is there is provided high-precision system clock, single-ended or Differential Input reference clock, and can be with output data clock；Inside 32
The orthogonal DDS in position, can be achieved FSK modulation function；12 DDS and DAC and datapath architecture, are subjected to compound I/Q input datas；
32 bit frequency control words, using the interface compatible with SPI, reliable convenient with FPGA controls, serial clock is 10MHz；With anti-
Turn SINC functions, conceivable signal envelope is recovered before DAC conversion.The circuit of modulated signal is produced using AD9856
Figure.
Coded modulation is carried out in FPGA, the I/Q two paths of signals of generation is sent into AD9856 via after serioparallel exchange,
There is a DDS kernel inside AD9856, producing orthogonal local oscillation signal by FPGA controls sends into quadrature modulator, and 2 are passed through per road
Level is added after being multiplied respectively with i/q signal, produces orthogonal demodulation signal, and specifically modulating mode can be by FPGA base
Band signal coding mapping is designed, and is exported, is then penetrated with coupling finally by 12 DAC analog difference signals for being changed into orthogonal modulation
The differential signal of output is converted to single-ended signal by frequency power transformer, is filtered via 70MHz SAW filter, finally from intermediate frequency
Amplifier carries out signal amplification, so that it may sends into frequency mixer and be mixed.
The mixer of module occurs for radiofrequency signal.Mixting circuit is particularly important to realizing for 3GHz frequency ranges, main complete
3GHz radio frequencies are modulated into by 70M intermediate-freuqncy signals, it is desirable to the band-rejected type of mixting circuit, here from the special of MAXIM companies
Chip is mixed with the MAX2671 of 3GHz frequency ranges.MAX2671 allows intermediate frequency incoming frequency between 40MHz to 500MHz, and radio frequency is defeated
Go out frequency between 0.3GHz to 3GHz.Using single-ended signal, a single pass multiplier is internally integrated, in penetrating for 3GHz
During the mixing output of frequency signal, the gain with 8.9dB, therefore, local oscillation signal are arrived in -10dBm between+5dBm.In input
During output matching, it is only necessary to seldom peripheral components.
RF local oscillator signal circuit is designed.In signal generator design, middle low frequency signal is mixed to 0.3GHz and arrived
3GHz frequency ranges are, it is necessary to produce RF local oscillator signal, and frequency is 3GHz.Local oscillation signal circuit is carried using PLL+VCO phase-locked loop
For local oscillation signal, there is precision and stability height, changeable frequency, the convenient adjustment of frequency resource afterwards or extension.This
Shake signal frequency stability it is critically important, this part design using integrated circuit as core, using the frequency synthesizer of ADI companies
The voltage controlled oscillator MAX2750 of ADF4113 and MAXIM companies.
RF local oscillator signal circuit block diagram：
Simulate 3 line serial interface signal sequential to control phase-locked loop frequency synthesizer by FPGA for control frequency synthesizer
ADF4113, according to the frequency for the frequency and voltage controlled oscillator (VCO) that reference crystal oscillator is completed inside ADF4113 (through removing Fractional-N frequency device)
The comparison of phase difference, and corresponding Linear voltage output is converted into, low-pass filtered device (LPF), which is considered, removes after High-frequency Interference, obtains
Obtain a relatively stable voltage, control VCO frequency of oscillation output, so as to obtain required 3GHz local oscillation signals.
ADF4113 is a high performance frequency synthesizer of ADI companies, and maximum operating frequency reaches 4GHz.ADF4113 master
Will be by a low noise digital phase discriminator (PFD), accurate charge pump, programmable reference frequency divider, a programmable A
(6bit) and B (13bit) frequency counters and a dual-mode frequency divider (P/P+1) are constituted.MAX2750 is that MAXIM companies are used for
The voltage controlled oscillator of 0.3GHz to 3GHz frequency ranges, is operated in 0.3GHz~3GHz frequency ranges.
LPF effect is exactly to consider the High-frequency Interference except voltage, so as to obtain relatively stable voltage.LPF design can be with
Realized using special programmable filter chip, such as can realize to low pass that by the adjustment of frequency it ends with MAX297
Frequency is 0~50kHz, so designs more flexible；Another way is exactly the 3 rank passive loop filters using standard, i.e.,
Use LRC circuit designs.
Metrological standard unit is traced to the source：Test frequencies at different levels and input and output dB values are determined, system debug is completed.Into
MAX2671 intermediate-freuqncy signal power is -30dBm~-20dBm, and RF local oscillator signal power is -10dBm~+5dBm.By surveying
Examination, understands that the signal source power output has reached -3.8dBm by the output spectrum of RF local oscillator signal circuit, is fully able to meet
The requirement that the input of upper frequency mixer MAX2671 RF local oscillators signal is arrived between+5dBm in -10dBm.It can be seen that the signal
Source power output has reached -24.5dBm, be fully able to meet the input of upper frequency mixer MAX2671 intermediate-freuqncy signals -30dBm to -
Requirement between 25dBm.
Wherein, the signal spectrum of frequency mixer MAX2671 outputs, 200kHz modulated signal and 1GHz radio-frequency carrier signal
The modulated signal of output after mixing, then power output is set by power amplifier module, then it is sent to N-type head output.
Metrological standard unit field process：Need to discuss with test director first and determine that sensor signal injection, output connect
Whether mouth can operate.Preferred testing program：Uhf electromagnetic wave signal is injected from built-in sensor, out of multiple positions
Put formula, the external sensor measurement output signal amplitude linearity；It is secondary to select testing program：From outer sensor Injection Signal, from
Multiple positions are built-in, the external sensor measurement output signal amplitude linearity；Fundamental test scheme：From outer sensor note
Enter signal, another external sensor measurement output signal amplitude linearity is installed from same disc insulator.
Prepare before experiment.Inspection apparatus integrality, confirms instrument energy normal work, it is ensured that instrument electricity is sufficient or live
AC power meets instrument use requirement；Check field test region, it is ensured that pilot region meets safety requirements；Detect proving ring
Whether border meets test request；Temperature and humidity should be recorded：If epidemic disaster is unsatisfactory for the environmental requirement of field calibration, in school
Should be to before quasi- work；Field calibration director reports to determine whether to carry out this calibration；With reference to the content of setting unit,
Check the connection of earth terminal；Confirmation uses the existing metering device working condition of hyperfrequency (UHF) normal.
Test position is selected：Test point selection.For GIS device, using at exposed disc insulator or built-in biography
Sensor, at breaker fracture, disconnecting switch, earthed switch, current transformer, voltage transformer, arrester, conductor coupling portion
Part etc. all should set test point.General each GIS intervals take at 2~3 points, can be 5~10 meters or so for longer bus air chamber
Take a bit, the position consistency of each test point should be kept, in order to be compared analysis.
Sensor is placed.The ultra-high frequency signal that shelf depreciation is produced inside GIS is in GIS cavitys in transverse electromagnetic wave mode
Propagate, only can just be leaked out at the discontinuous position of metal of GIS shells.On GIS only the insulator without metal flange,
The positions such as observation window, the exposed insulating part of earthed switch, SF6 gas pressures release window can just measure signal, hyperfrequency sensing
Device need to be placed in these positions, and sensor placement location should also be avoided fastening insulating basin bolt, to reduce bolt to internal electricity
The shielding of magnetic wave and sensor produce to obtain exterior static interference with bolt.
Testing time.Testing time is no less than 30 seconds, is taken multiple measurements again if any abnormal.And multigroup measurement data is entered
Row amplitude is contrasted and trend analysis；
The amplitude linearity is tested：Connection calibration wiring；Using the sensing calibrated in laboratory environments under site environment
Device (antenna) outputs signal to the sensor being calibrated using signal generator and signal amplifier as signal transmitting antenna
(antenna) and launch UHF electromagnetic waves, recommend to be used as output using the unmodulated sinusoidal signal of uhf band.By the quilt of proximal most position
Examination sensor is used for receiving the UHF signals of calibration as sensor (antenna) is received.
Because the electric-field intensity E0 of receiving terminal is heterogeneous, and electric field probe or standard gain antenna pair can not be used
Electric-field intensity inside GIS is measured, and is only capable of measuring by the sensor being arranged in GIS, in testing at the scene
Differ and surely obtain the transfer function H sen of each sensor, therefore sensor should be regarded as to a GIS part, then to sensing
The voltage signal magnitude linearity of device output end is verified.
After connection calibration wiring, tested sensor and the connection of IED or measurement host, and equal proportion reduction note are kept first
Enter the amplitude of signal, read tested response of the on-Line Monitor Device to steady-state field from display interface, and record measurement variation
Amount, and record one group of measured value.Then keep the radiofrequency signal of injection constant, then lead tested sensor and IED or measurement
The electrical connection of machine disconnects, and uses 50 Ω RF cable to be connected to the measurement module of measurement criteria, to obtain tested sensing
Device makes instrument output indicator full scale to the voltage responsive Va of stable state rf electric field intensity, adjusting signal amplitude.Write down input
Peak impulse voltage U and indicator full scale value A, reduces peak impulse voltage to λ U, λ=0.8,0.6,0.4,0.2 are write down successively
The corresponding indicating value of output indicator.Output indicator is calculated as follows in the nonlinearity erron of each measurement point：
In formula：ε is the linear relative error of detector amplitude measurement；λ is that amplitude changes ratio.
Result of the test is consistent with expection.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with
The present invention is described in detail good embodiment, it will be understood by those within the art that, can be to skill of the invention
Art scheme is modified or equivalent substitution, and without departing from the objective and scope of the technical program, it all should cover in the present invention
Protection domain among.
Claims (7)
1. the calibrating installation of ultrahigh frequency partial discharge on-Line Monitor Device under a kind of site environment, it is characterised in that：Including tested online
Monitoring device, the measurement module for being tested sensor, measurement host, signal generator and measurement criteria；
The tested sensor being arranged in tested on-Line Monitor Device；The tested sensor is connected with measurement host；
The measurement module of the measurement criteria is connected by RF cable with tested sensor；
The signal generator is connected to inject uhf electromagnetic wave signal to tested sensor with tested sensor；
The measurement host obtains the tested response signal of tested on-Line Monitor Device；
The measurement module of the measurement host and measurement criteria connects to obtain the normal response signal of tested sensor；
The measurement host generates calibration result according to the normal response signal of acquisition and tested response signal.
2. the calibrating installation of ultrahigh frequency partial discharge on-Line Monitor Device under site environment as claimed in claim 1, it is characterised in that：
The tested sensor includes the built-in type UHF sensor being arranged on GIS device pipeline；The built-in type UHF sensor will
Obtain monitoring response signal and be input to measurement host.
3. the calibrating installation of ultrahigh frequency partial discharge on-Line Monitor Device under site environment as claimed in claim 1, it is characterised in that：
The tested sensor includes the externally positioned type type UHF sensor being arranged on GIS device pipeline；The signal amplifier sends out signal
The test signal of raw device generation is injected into externally positioned type type UHF sensor.
4. the calibrating installation of ultrahigh frequency partial discharge on-Line Monitor Device under site environment as claimed in claim 1, it is characterised in that：
The signal generator is realized to tested sensor injection uhf electromagnetic wave signal according to following steps：
The amplitude of the output signal of Regulate signal generator makes the indicator of output signal reach full scale；Write down output signal
Crest voltage U and indicator full scale value A；
Change the crest voltage of output signal successively, write down the corresponding crest voltage and indicator scale value of output signal；
The nonlinearity erron in each measurement point is calculated according to below equation：
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<msub>
<mi>&epsiv;</mi>
<mi>l</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>A</mi>
<mi>&lambda;</mi>
</msub>
<mo>-</mo>
<mi>&lambda;</mi>
<mi>A</mi>
</mrow>
<mrow>
<mi>&lambda;</mi>
<mi>A</mi>
</mrow>
</mfrac>
<mo>&times;</mo>
<mn>100</mn>
<mi>%</mi>
<mo>;</mo>
</mrow>
In formula：ε is the linear relative error of detector amplitude measurement；λ is that amplitude changes ratio.
5. the calibrating installation of ultrahigh frequency partial discharge on-Line Monitor Device under site environment as claimed in claim 1, it is characterised in that：
The signal generator is that module occurs for radiofrequency signal.
6. the calibrating installation of ultrahigh frequency partial discharge on-Line Monitor Device under site environment as claimed in claim 1, it is characterised in that：
Be arranged at intervals with UHF electromagnetic wave signal couplers on the GIS device inside, the UHF electromagnetic wave signals coupler successively with
Built-in type UHF sensor connection.
7. the calibrating installation of ultrahigh frequency partial discharge on-Line Monitor Device under site environment as claimed in claim 1, it is characterised in that：
The external hyperfrequency type UHF sensor is installed on the outside of the disc insulator that plug hole is reserved on GIS device pipeline.
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