CN107656226A - HFCT electrical parameter test devices and method of testing based on transmission coefficient - Google Patents
HFCT electrical parameter test devices and method of testing based on transmission coefficient Download PDFInfo
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- CN107656226A CN107656226A CN201710791146.6A CN201710791146A CN107656226A CN 107656226 A CN107656226 A CN 107656226A CN 201710791146 A CN201710791146 A CN 201710791146A CN 107656226 A CN107656226 A CN 107656226A
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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
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Abstract
The invention discloses a kind of HFCT electrical parameter test devices and method of testing based on transmission coefficient, the test device includes Network Analyzer and tester；The composition of tester includes metal shell, is separately positioned on input interface and output interface that metal shell both ends are connected by plain conductor, input interface connects through the output end of the first coaxial cable and Network Analyzer, output interface is connected with build-out resistor, HFCT to be tested is placed in metal shell, the heart passes through plain conductor therefrom, and is connected through the input of the second coaxial cable and Network Analyzer.The present invention can be to obtain HFCT transmission coefficient by once testing, the relation according to its transmission function and transfer impedance and transmission coefficient obtains transmission function and transfer impedance again, further obtain its electric parameter (including bandwidth, lower frequency limit, upper limiting frequency, sensitivity etc.), so as to realize quick, stably measured to HFCT electric parameters, data supporting is provided for HFCT Performance Evaluations.
Description
Technical field
The invention belongs to power system detection technique field, is related to a kind of HFCT electrical parameters measures based on transmission coefficient
Device and method of testing.
Background technology
Power equipment electric discharge in the process of running, electromagnetic force, thermal stress, hygrothermal environment, harmful active gases, oil
Dirt, dust etc. can all cause the progressively deterioration of insulating material properties, so that some insulation in power equipment (power transmission line)
Shelf depreciation occurs for weak link.With the development of power system and the raising of voltage class, shelf depreciation has become electric power
One of the main reason for apparatus insulated deterioration.
At present, mainly the insulation status of power system mesohigh alternating current equipment is detected using Partial Discharge Detection method
And assessment.Partial Discharge Detection method is using various phenomenons caused by shelf depreciation as foundation, by the thing for describing various phenomenons
Reason amount characterizes shelf depreciation；Different according to Cleaning Principle, Partial Discharge Detection method can be divided into two classes：(1) based on electric current
Electromagnetic induction principle, including Electromagnetic coupling method, direction coupled method, hyperfrequency inductively coupled method etc.；(2) the electric capacity coupling based on voltage
Close principle, including capacitive couplings, calculus of finite differences, transient state voltage-to-ground method etc..Wherein, Electromagnetic coupling method mainly uses high frequency electric
Sensor (High Frequency Current Transformer) couples high frequency current impulse on ground wire, is realized to electric power
The detection of apparatus local discharge signal.Using the Electromagnetic coupling method to power equipment carry out local discharge signal detection before, it is necessary to
First HFCT classical insulation (including bandwidth, bound frequency, sensitivity etc.) is tested, electric power is suitable for selection
The HFCT of apparatus local discharge detection.
Test HFCT classical insulations mainly have two ways both at home and abroad at present：(1) using by signal source, three high frequencies
The test equipment that electric capacity and oscillograph are formed, the sine wave of various frequencies is produced using signal source, passes through two identical high frequencies
Electric capacity carries out partial pressure, then passes through sensor geometric center with an identical high frequency capacitance, and with wherein one in derided capacitors
Individual parallel connection, using oscilloscope measurement HFCT output port signals, HFCT amplitude-versus-frequency curve is finally given, referring to【Hand in Shanghai
Logical university Sun Jing Master's thesis《High voltage power cable Partial Discharge Detecting Technology research》, Dai Xuyi et al. in 2014
《Shanghai University Of Electric Power's journal》On deliver《The design of shelf depreciation high-performance electric flow sensor》Deng】；(2) using by signal
The test equipment that source, noninductive resistance are formed, the external noninductive resistance of signal source simultaneously pass through HFCT, and various frequencies are produced using signal source
The sine wave of rate, the signal of noninductive resistance both ends and HFCT output ends is measured, make HFCT amplitude-versus-frequency curve or transmission resistance
It is anti-【Zhao Xuefeng et al. in 2010《Instrument and meter》In deliver《Partial discharge detecting system is ground under oscillatory surge voltage
Study carefully》】.Above two mode is both needed to measure multiple Frequency points one by one, produces signal using AWG, passes through
Test loop, the current signal line obtained is passed perpendicularly through into HFCT geometric centers as far as possible, signal is measured with oscillograph, due to
The each Frequency point of AWG can only produce a kind of waveform, be measured one by one so needing to adjust each Frequency point,
It is time-consuming longer；Test effect in low frequency is preferable, but during for higher frequency, due to the sense of various connecting lines in high frequency
P-wire through HFCT position difference can cause the of different sizes of induced electromotive force during anti-and each test, and this can be to measurement
As a result large effect is produced, so that high-frequency test result produces larger error.
As can be seen from the above analysis, at present there is test limitation in HFCT electric performance tests mode, particularly, lack
A kind of solution of few HFCT electric performance test errors when effectively reducing high frequency.Therefore, a kind of simple to operate, measurement of research and development
The high HFCT electric performance test methods of precision, the development tool for Partial Discharge Detecting Technology are of great significance.
The content of the invention
For time-consuming existing for current HFCT electrical parameters measures method, test has the problems such as error, the present invention carries
A kind of HFCT electrical parameter test devices and method of testing based on transmission coefficient have been supplied, the testing time can not only be shortened, carried
High measurement efficiency, and test error can be reduced, improve measurement accuracy.
The invention provides a kind of HFCT electrical parameter test devices based on transmission coefficient, including Network Analyzer and survey
Try instrument；The composition of the tester include metal shell, be separately positioned on metal shell both ends connected by plain conductor it is defeated
Incoming interface and output interface, input interface connect through the output end of the first coaxial cable and Network Analyzer, output interface connection
There is build-out resistor, HFCT to be tested is placed in metal shell, connects the plain conductor of input interface and output interface from HFCT
Center passes through, and HFCT is by its BNC connector (Bayonet Nut Connector) through the second coaxial cable and Network Analyzer
Input connects.
The above-mentioned HFCT electrical parameter test devices based on transmission coefficient, the metal shell Inner Constitution accommodate HFCT's
Space, in order to avoid the influence that external electromagnetic field is tested HFCT, the metal shell at least top and the left and right sides are metal
Material；In order to fix HFCT, and ensure plain conductor from HFCT centrally through HFCT bottoms can be fixed by dielectric support
In metal shell.
The above-mentioned HFCT electrical parameter test devices based on transmission coefficient, HFCT transmission coefficients are entered using Network Analyzer
Row test, the calibration function carried using Network Analyzer, before testing to Network Analyzer (model：) and tester E5061B
Connected with p-wire, the transmission coefficient of test device itself is tested, and carry out self calibration, to eliminate test device itself
The influence that transmission characteristic is tested HFCT transmission characteristics, so as to reduce test error；Test device is when carrying out self calibration, by net
The physical circuit loop implementation of the compositions such as network analyzer, tester is：By the input interface of tester through the first coaxial electrical
The output end of cable and Network Analyzer connects, and output interface connects through the input of the second coaxial cable and Network Analyzer.
The above-mentioned HFCT electrical parameter test devices based on transmission coefficient, matching electricity is connected with tester output interface
Resistance, so that test device forms circuit loop, produce electric current and produce electric current phase with forming circuit loop during test device self calibration
Together.
Invention further provides a kind of HFCT electrical parameters measure methods based on transmission coefficient, it is based on using above-mentioned
The HFCT electrical parameter test devices of transmission coefficient, its testing procedure are as follows：
(1) self calibration is carried out to test device, to eliminate influence of the transmission coefficient of test device itself to measurement result；
(2) HFCT is tested, obtains its transmission coefficient S12：
The input interface of tester is connected through the output end of the first coaxial cable and Network Analyzer, output interface connection
There is build-out resistor, HFCT to be tested is placed in metal shell, connects the plain conductor of input interface and output interface from HFCT
Center is passed through, and HFCT is connected by its BNC connector through the input of the second coaxial cable and Network Analyzer；Pass through network analysis
Instrument is tested HFCT, obtains HFCT transmission coefficient S12；
(3) HFCT transmission function is calculated according to below equation (i)：
| H (ω) |=S12+20log10(Rt) (i)
Wherein, | H (ω) | for HFCT transmission function, S12For transmission coefficient, RtFor build-out resistor resistance；
Take | H (ω) | transmission function amplitude, which declines, set gained after reference value | H (ω) | respective frequencies as lower frequency limit with
The difference of upper limiting frequency, upper limiting frequency and lower frequency limit is bandwidth；
(4) HFCT transfer impedance is obtained according to below equation (ii), and as HFCT sensitivity：
Wherein, Z (f) is transfer impedance.
The above-mentioned HFCT electrical parameters measure methods based on transmission coefficient, self-alignment physical circuit is carried out to test device
Loop implementation is：The input interface of tester is connected through the output end of the first coaxial cable and Network Analyzer, output
Interface connects through the input of the second coaxial cable and Network Analyzer, then to tester and the first coaxial cable and second
Coaxial cable is transmitted coefficient test, and carries out self calibration, to eliminate the transmission coefficient of test device itself.
The above-mentioned HFCT electrical parameters measure methods based on transmission coefficient, by | H (ω) |=S12+20log10(Rt), can be with
Find out HFCT transmission function | H (ω) | with its transmission coefficient S12Linear correlation, after HFCT transmission coefficient is obtained,
To obtain HFCT transmission function, so as to transmission function according to gained | H (ω) |, further obtain HFCT bandwidth and
Upper and lower limit frequency；Further, can be by after HFCT transmission coefficient is obtainedObtain transfer impedance
Z (f), because transfer impedance and sensitivity have equivalence, it is possible to the spirit using obtained transfer impedance Z (f) as HFCT
Sensitivity parameter, its peak value are peak response.
Traditional HFCT electrical parameters measures method, when testing HFCT amplitude versus frequency charactes, it is necessary to multiple Frequency points
Measured one by one, test every time needs testing time for growing very much, and test device itself can produce interference, meeting during due to high frequency
Certain test error is produced, so as to produce harmful effect to HFCT amplitude versus frequency charactes test result.
Compared with prior art, HFCT electrical parameter test devices and test side provided by the invention based on transmission coefficient
Method, have the advantages that：
1st, HFCT electrical parameter test devices of the present invention carry out self calibration using Network Analyzer to test device, eliminate and survey
Influence of the self transmission coefficient to test HFCT transmission coefficients is put in trial assembly；
2nd, HFCT is enclosed in metal shell by HFCT electrical parameter test devices of the present invention, and there is metal shell shielding to make
With so as to avoid the interference of segment space electromagnetic field；
3rd, HFCT electrical parameter test devices metal shell internal height and HFCT matcheds of the present invention, so that HFCT
Be fixed in metal shell, prevent HFCT from moving, so as to avoid because HFCT is mobile and caused by measurement error；
4th, HFCT electrical parameters measures method of the present invention, by once test can to obtain HFCT transmission coefficient, then
HFCT transmission function and transfer impedance is obtained according to HFCT transmission functions and transfer impedance and the relation of HFCT transmission coefficients, is entered
One step obtains HFCT electric parameter (including bandwidth, lower frequency limit, upper limiting frequency, sensitivity etc.), so as to realize to HFCT electricity
Quick, the stably measured of gas parameter, greatly reduce workload.
Brief description of the drawings
Schematic diagram when Fig. 1 is HFCT electrical parameter test device self calibrations of the present invention based on transmission coefficient.
Schematic diagram when Fig. 2 is HFCT electrical parameter test devices test of the present invention based on transmission coefficient.
Equivalent circuit diagram when Fig. 3 is HFCT electrical parameter test device test of the present invention based on transmission coefficient.
Fig. 4 is the curve that the transmission coefficient obtained in the embodiment of the present invention 1 before test device self calibration changes with frequency.
Fig. 5 is the curve that the transmission coefficient obtained in the embodiment of the present invention 1 after test device self calibration changes with frequency.
Fig. 6 is the curve that the HFCT transmission coefficients for testing to obtain in the embodiment of the present invention 2 change with frequency.
Fig. 7 is the curve that the HFCT transfer impedances for testing to obtain in the embodiment of the present invention 2 change with frequency.
Fig. 8 is the curve that the HFCT transmission coefficients for testing to obtain in the embodiment of the present invention 3 change with frequency.
Fig. 9 is the curve that the HFCT transfer impedances for testing to obtain in the embodiment of the present invention 3 change with frequency.
1st, Network Analyzer, 2, tester, 21, metal shell, 22, input interface, 23, output interface, 3, build-out resistor,
4th, the first coaxial cable, 5, plain conductor, the 6, second coaxial cable, 7, HFCT.
Embodiment
Embodiments of the invention are provided below with reference to accompanying drawing, and technical scheme is entered to advance by embodiment
Clear, the complete explanation of one step.Obviously, the embodiment is only the part of the embodiment of the present invention, rather than whole realities
Apply example.Based on present invention, those of ordinary skill in the art institute resulting on the premise of creative work is not made
There are other embodiments, belong to the scope that the present invention is protected.
Embodiment 1
The HFCT electrical parameter test devices based on transmission coefficient that the present embodiment provides, mainly by Network Analyzer 1, survey
Examination instrument 2, build-out resistor 3, the first coaxial cable 4, plain conductor 5, the second coaxial cable 6 are formed.Network Analyzer model is pacified
Prompt human relations E5061B.The composition of tester 2 includes rectangular metal case 21, is separately positioned on metal shell both ends and passes through plain conductor
The input interface 22 and output interface 23 of 5 connections；During in face of tester, rectangular metal case 21, including four, upper and lower, left and right
Face, the material in four faces are aluminium, the long 319mm of metal shell, wide 220mm, high 166mm.The Inner Constitution of metal shell 21 accommodates
HFCT space, the internal height of metal shell 21 are more than HFCT overall diameters.The above-mentioned HFCT electric parameters based on transmission coefficient are surveyed
Trial assembly circuits connected mode is divided into two states：Test device self calibration state (as shown in Figure 1) and test mode (such as Fig. 2
It is shown)：
(1) self calibration state, output end of the input interface 22 through the first coaxial cable 4 with Network Analyzer 1 of tester
Connection, output interface 23 are connected through the second coaxial cable 6 with the input of Network Analyzer 1；
(2) test mode, output end of the input interface 22 of tester through the first coaxial cable 4 and Network Analyzer 1 connect
Connect, output interface 23 is connected with build-out resistor 3, and HFCT to be tested is placed in metal shell by dielectric support (such as foam)
Interior, the plain conductor 5 for connecting input interface and output interface passes through from HFCT centers, and HFCT is same through second by its BNC connector
Shaft cable 6 is connected with the input of Network Analyzer 1.
Embodiment 2
The present embodiment uses the HFCT electrical parameter test devices based on transmission coefficient provided in embodiment 1 to be surveyed
Examination, testing procedure are as follows：
(1) self calibration is carried out to test device, to eliminate influence of the self transmission coefficient of tester to test result：
The input interface 22 of tester is connected through the first coaxial cable 4 with the output end of Network Analyzer 1, output interface
23 are connected through the second coaxial cable 6 with the input of Network Analyzer 1, then to the coaxial cable 4 of tester 2 and first and
Two coaxial cables 6 be transmitted coefficient test, its test result as shown in figure 4, explanation test device itself transmission coefficient be present,
If do not calibrated to test device itself, HFCT transmission coefficient test can be impacted.Grasped according to test result
Make Network Analyzer so that the transmission coefficient of test device itself is essentially 0 (as shown in Figure 5), completes the self-correcting of test device
Standard, eliminate influence of the transmission coefficient of test device itself to HFCT transmission coefficients.
(2) HFCT is tested, obtains its transmission coefficient S12：
The input interface 22 of tester is connected through the first coaxial cable 4 with the output end of Network Analyzer 1, output interface
23 are connected with the (R in the present embodiment of build-out resistor 3t=50 Ω), HFCT to be tested is placed in by dielectric support (such as foam)
In metal shell, the plain conductor 5 for connecting input interface and output interface passes through from HFCT centers, and HFCT passes through its BNC connector
It is connected through the second coaxial cable 6 with the input of Network Analyzer 1；HFCT is tested by Network Analyzer 1, obtained
HFCT transmission coefficient S12；Transmission coefficient S12It is as shown in Figure 6 with frequency variation curve.
(3) HFCT transmission function is obtained, and further obtains HFCT lower frequency limit, upper limiting frequency and bandwidth：
The above-mentioned HFCT electrical parameter test devices based on transmission coefficient HFCT is transmitted coefficient test when etc.
Circuit diagram is imitated as shown in figure 3, above-mentioned HFCT transmission coefficients S12With the input signal u of the input of Network Analyzer1(ω) and net
The output signal u of the output end of network analyzer2(ω) meets relationship below：
Due to HFCT transmission functionAbove-mentioned (iii) formula and (iv) formula are substituted into
(v) formula, just obtain | H (ω) |=S12+20log10(Rt) (i), wherein, | H (ω) | for HFCT transmission function, S12For transmission
Coefficient, RtFor build-out resistor resistance.
Take | H (ω) | transmission function amplitude, which declines, set gained after reference value | H (ω) | respective frequencies as lower frequency limit with
The difference of upper limiting frequency, upper limiting frequency and lower frequency limit is bandwidth；Reference value is set in the present embodiment as -6dB；Due to the present embodiment
Middle transmission function | H (ω) | with transmission coefficient S12Linear correlation, and coefficient correlation is 1, therefore, can be according to transmission coefficient
S12With the change curve of frequency, according to transmission coefficient S12Amplitude declines gained S after setting reference value12Respective frequencies are lower limit frequency
Rate and upper limiting frequency, HFCT lower frequency limits obtained by the present embodiment are 0.1MHz, upper limiting frequency 100MHz, with a width of 99.9MHz.
(4) HFCT sensitivity is obtained：
Due to HFCT transfer impedanceAbove-mentioned (iii) formula and (iv) formula are substituted into (vi) formula, just
ObtainWherein, Z (f) is transfer impedance.
The transmission coefficient S that step (2) is obtained12Substitute into formula (ii) and obtain HFCT transfer impedance, obtained transmission resistance
Anti- Z (f) with the change curve of frequency as shown in fig. 7, because transfer impedance and sensitivity have equivalence, so by transfer impedance
As HFCT sensitivity, its peak value is peak response, and as can be seen from Figure 7 peak response is 4.75V/A.
The HFCT model HFCT5861 that the present embodiment is tested, according to its test report, are converted to the present embodiment -6dB
Under the conditions of upper and lower limit frequency be 0.1~99MHz, peak response 5.01V/A.
As can be seen here, the electric parameter for the HFCT that the present embodiment measures provides basically identical with producer, and the present embodiment carries
The HFCT electrical parameters measures method based on transmission coefficient supplied can quickly and stably obtain HFCT electric parameter, be
HFCT Performance Evaluations provide data supporting.
Embodiment 3
That the present embodiment is tested is HFCT models HFCT21970.
The HFCT electrical parameters measure methods that the present embodiment is taken are same as Example 2, by testing obtained transmission system
Number S12With frequency variation curve as shown in figure 8, by transmission coefficient S12Substitute into | H (ω) |=S12+20log10(Rt), obtain HFCT
- 6dB (setting reference value) under a width of 18.43MHz of band, its upper limiting frequency is 18.53MHz, lower frequency limit 0.1MHz.Will
Obtained transmission coefficient S12Substitute intoObtain HFCT transfer impedance, obtained transfer impedance Z (f) with
The change curve of frequency is as shown in figure 9, as can be seen from the figure its peak response is 4.09V/A.
Claims (5)
1. a kind of HFCT electrical parameter test devices based on transmission coefficient, it is characterised in that including Network Analyzer (1) and survey
Try instrument (2)；The composition of the tester includes metal shell (21), is separately positioned on metal shell both ends and passes through plain conductor
(5) input interface (22) and output interface (23) of connection, input interface is through the first coaxial cable (4) and Network Analyzer (1)
Output end connection, output interface is connected with build-out resistor (3), and HFCT to be tested is placed in metal shell, and connection input connects
Mouthful passed through with the plain conductor (5) of output interface from HFCT centers, HFCT by its BNC connector through the second coaxial cable (6) and
The input connection of Network Analyzer.
2. the HFCT electrical parameter test devices according to claim 1 based on transmission coefficient, it is characterised in that the gold
It is metal material to belong to housing at least top and the left and right sides.
3. the HFCT electrical parameter test devices according to claim 1 or 2 based on transmission coefficient, it is characterised in that described
HFCT is placed in metal shell by dielectric support.
4. utilize the method for the test device test HFCT electric parameters described in claim 1 or 2 or 3, it is characterised in that including
Following testing procedure：
(1) self calibration is carried out to test device, to eliminate influence of the transmission coefficient of test device itself to measurement result；
(2) HFCT is tested, obtains its transmission coefficient S12：
The input interface (22) of tester is connected through the first coaxial cable (4) with the output end of Network Analyzer (1), output connects
Mouth (23) matching connection resistance (3), HFCT to be tested are placed in metal shell, connect the metal of input interface and output interface
Wire (5) passes through from HFCT centers, and HFCT passes through input of its BNC connector through the second coaxial cable (6) Yu Network Analyzer
Connection, is tested HFCT by Network Analyzer (1), obtains HFCT transmission coefficient S12；
(3) HFCT transmission function is calculated according to below equation (i)：
| H (ω) |=S12+20log10(Rt) (i)
Wherein, | H (ω) | for HFCT transmission function, S12For transmission coefficient, RtFor build-out resistor resistance；
Take | H (ω) | transmission function amplitude, which declines, to be set obtained by after reference value | H (ω) | respective frequencies is lower frequency limits and the upper limit
The difference of frequency, upper limiting frequency and lower frequency limit is bandwidth；
(4) HFCT transfer impedance is obtained according to below equation (ii), and as HFCT sensitivity：
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<mn>12</mn>
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Wherein, Z (f) is transfer impedance.
5. the method for test HFCT electric parameters according to claim 4, it is characterised in that self-correcting is carried out to test device
Accurate physical circuit loop implementation is：By the input interface (22) of tester through the first coaxial cable (4) and network analysis
The output end connection of instrument (1), output interface (23) are connected through the second coaxial cable (6) with the input of Network Analyzer (1), so
The transmission coefficient of test device itself is tested afterwards, and carries out self calibration, to eliminate the transmission characteristic of test device itself.
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| CN112505411A (en) * | 2020-10-30 | 2021-03-16 | 山东科技大学 | Method for identifying cable transfer function on line |
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| CN113899998A (en) * | 2021-09-03 | 2022-01-07 | 深圳供电局有限公司 | IGBT parameter testing method and device, computer equipment and storage medium |
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