CN106526324A - Impedance characteristic test device of capacitive device - Google Patents
Impedance characteristic test device of capacitive device Download PDFInfo
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- CN106526324A CN106526324A CN201610986865.9A CN201610986865A CN106526324A CN 106526324 A CN106526324 A CN 106526324A CN 201610986865 A CN201610986865 A CN 201610986865A CN 106526324 A CN106526324 A CN 106526324A
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- cable
- impedance
- core
- electric capacity
- tie point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
Abstract
The present invention relates to an impedance characteristic test device of a capacitive device. The device comprises an impedance analyzer, a first cable, a second cable and a capacitor, one end of the impedance analyzer is connected with one end of a to-be-tested capacitive device via the first cable, and the other end is connected with the other end of the to-be-tested capacitive device via the second cable, and the capacitor is in parallel connection between the first cable and the second cable, so that the difference values of the wave impedance of the first and second cables and the internal impedance of the impedance analyzer are both within a set range. According to the present invention, an error introduced by the inductance of a test line can be eliminated during a test process, so that the accurate impedance of the capacitive device is obtained, and the test precision is improved.
Description
Technical field
The present invention relates to power equipment configured transmission field tests, the impedance operator survey of more particularly to a kind of capacitive apparatus
Trial assembly is put.
Background technology
The configured transmission of power equipment is for the power circuit electricity in the case of accurate calculating thunderbolt, operation or fault overvoltage
Pressure and electric current branch are significant.But as power equipment volume is larger, each terminal distance farther out, is directed to capacitive and sets
Standby impedance operator, traditional method of testing are using longer wire connection Devices to test and electric impedance analyzer in test.
But the impedance parameter of longer wire lead can cause the inaccurate of test result, and for capacitive apparatus to be measured, in some instances it may even be possible to because
Resonance effect and cause test result to deviate significantly from the situation of actual result.
The content of the invention
Based on this, the present invention provides a kind of impedance operator test device of capacitive apparatus, eliminates the impedance parameter of p-wire
For the impact of test result, to obtain the impedance operator of more accurately capacitive apparatus.
For achieving the above object, the embodiment of the present invention is employed the following technical solutions：
A kind of impedance operator test device of capacitive apparatus, including electric impedance analyzer, the first cable, the second cable and electricity
Hold；
The one end of one end of the electric impedance analyzer by first cable connection to measured capacitive equipment, the impedance
The other end of the other end of analyzer by second cable connection to the measured capacitive equipment；
The electric capacity is connected in parallel between first cable and second cable, so that first cable and institute
The wave impedance of the second cable and the difference of the internal impedance of the electric impedance analyzer are stated in setting range.
By the capacitance of adjustment electric capacity in the embodiment of the present invention so that the wave impedance of the first cable and second cable,
It is close with the internal impedance of electric impedance analyzer, such that it is able to the error that p-wire inductance is introduced is eliminated in test process, with
The impedance of accurate capacitive apparatus is obtained, measuring accuracy is improved.
Description of the drawings
Fig. 1 is the impedance operator test device structural representation in one embodiment of the capacitive apparatus of the present invention；
Fig. 2 is that the impedance operator of the capacitive apparatus of the present invention tests dress structural representation in another embodiment.
Specific embodiment
Present disclosure is described in further detail below in conjunction with preferred embodiment and accompanying drawing.Obviously, hereafter institute
The embodiment of description is only used for explaining the present invention, rather than limitation of the invention.Based on the embodiment in the present invention, this area is general
The every other embodiment obtained under the premise of creative work is not made by logical technical staff, belongs to present invention protection
Scope.Although it should be appreciated that hereinafter adopting term " first ", " second " etc. to describe various information, these letters
Breath should not necessarily be limited by these terms, and these terms are only for same type of information is distinguished from each other out.For example, without departing from this
In the case of bright scope, " first " information can also be referred to as " second " information, similar, and " second " information can also be referred to as
" first " information.It also should be noted that, for the ease of description, illustrate only part related to the present invention in accompanying drawing and
Not all content.
Fig. 1 is the impedance operator test device structural representation in one embodiment of the capacitive apparatus of the present invention, such as
Shown in Fig. 1, the impedance operator test device of the capacitive apparatus in the present embodiment, including electric impedance analyzer 10, the first cable 21,
Two cables 22 and electric capacity 30.Wherein, one end of electric impedance analyzer 10 is connected to measured capacitive equipment 700 by the first cable 21
One end, the other end of electric impedance analyzer 10 are connected to the other end of measured capacitive equipment 700 by the second cable 22.Electric capacity 30 is simultaneously
Connection is connected between the first cable 21 and the second cable 22, so that the wave impedance of the first cable 21 and the second cable 22 and impedance point
The difference of the internal impedance of analyzer 10 is in setting range.
Above-mentioned setting range takes a less scope, so by the capacitance of adjustment electric capacity 30, can cause first
The wave impedance of cable 21 and the second cable 22 is close with the internal impedance of electric impedance analyzer 10.
Capacitive apparatus to be measured are measured by the impedance operator test device of the capacitive apparatus in using the present embodiment
When, due to the wave impedance of the first cable 21 and the second cable 22 it is close with the internal impedance of electric impedance analyzer 10, such that it is able to disappear
Except the deviation that p-wire inductance is introduced, resolved impedance spectroscopy analyzer when capacitive apparatus are tested, due to wiring length, introduce inductance it is big and
The inaccurate problem of test result for causing.
Fig. 2 is that the impedance operator of the capacitive apparatus of the present invention tests dress structural representation in another embodiment, such as
Shown in Fig. 2, the first cable 21 includes the N sections single-core cable 210 being sequentially connected, and the second cable 22 includes the N section lists being sequentially connected
Core cable 220, the number of electric capacity 30 is N-1, and wherein N is the positive integer more than 1.
With reference to shown in Fig. 2, the first cable 21 has N-1 tie point a, wherein during the 1st tie point a is the first cable 21
The tie point of the 1st section of single-core cable 210 and the 2nd section of single-core cable 210, the 2nd tie point a are the 2nd section of single-core cable 210 and the
The tie point of 3 sections of single-core cables 210, the rest may be inferred, and the N-1 tie point a is N-1 sections single-core cable 210 and N section singles
The tie point of cable 210.
In the same manner, the second cable 22 also has N-1 tie point b, wherein the 1st tie point b is the 1st section in the second cable 22
The tie point of single-core cable 220 and the 2nd section of single-core cable 220, the 2nd tie point b are the 2nd section of single-core cable 220 and the 3rd section of list
The tie point of core cable 220, the rest may be inferred, and the N-1 tie point b is N-1 sections single-core cable 220 and N section single-core cables
220 tie point.
With reference to shown in Fig. 2, k-th electric capacity 30 is connected to k-th of k-th tie point a and the second cable of the first cable
Between tie point b, to form ladder network；Wherein, k is positive integer, and 1≤k≤N-1.By the appearance for adjusting each electric capacity 30
Value, can cause the wave impedance of each ladder in ladder network approximate with the internal impedance of electric impedance analyzer, i.e., so that the first cable
The wave impedance of the single-core cable 220 in single-core cable 210 and corresponding second cable 22 in 21, it is interior with electric impedance analyzer
Impedance is approximate.The Novel connecting wire constituted using ladder network is used as p-wire, connection electric impedance analyzer 10 and measured capacitive equipment
700, the deviation of p-wire inductance introducing can be eliminated in test process, the accuracy of test result is improved.
In a kind of optional embodiment, the single-core cable in the first cable 21 and the second cable 22 is and is provided with screen
The single-core cable of layer is covered, and the parameter (inductance of unit length, the electric capacity of unit length) of single-core cable can consult acquisition.
In a kind of optional embodiment, the length of kth section single-core cable 210 and the second cable 22 in the first cable 21
The length of middle kth section single-core cable 220 is identical, and the length of each section of single-core cable be respectively less than or equal to wavelength to be measured very
One of.
Specifically, wavelength to be measured can be determined according to measured frequency is treated.Single-core cable 210 and second in first cable 21
The length of single-core cable 220 corresponding in cable 22 is identical, and the length of each section of single-core cable 210 in the first cable 21
Degree with difference, but can not be more than 1/10th of wavelength to be measured.In the same manner, each section of single-core cable in the second cable 21
210 length with difference, but can not be more than 1/10th of wavelength to be measured.In addition, by difficulty during reality processing
And the restriction of theoretical foundation, measured frequency is being treated higher than 30 megahertzs (wavelength i.e. to be measured is less than 10 meters) or be less than 2 megahertzs (i.e.
Wavelength to be measured is more than 150 meters) when, the impedance operator test device certainty of measurement of the capacitive apparatus in the present embodiment is not high enough, because
This, is originally that the impedance operator test device of capacitive apparatus in embodiment is adapted to wavelength to be measured between 10 meters to 150 meters
Occasion, therefore the length of each section of single-core cable is respectively less than or is equal to 15 meters in the first cable 21 and the second cable 22.
Further, the impedance operator test device of the capacitive apparatus in the present embodiment, may also include screening arrangement, use
The screening arrangement wraps up electric capacity 30, plays a part of shielding, can further improve measuring accuracy.
In a kind of optional embodiment, the capacitance of each electric capacity 30 can be determined by following conditional：
Wherein, CkFor the capacitance of k-th electric capacity 30, electric capacity of the C for single-core cable unit length, L are single-core cable unit
The inductance of length, d is the length of kth section single-core cable in the first cable 21, ZDFor the internal resistance of electric impedance analyzer.It is every by adjustment
The capacitance of one electric capacity so that the wave impedance of each ladder is approximate with the internal impedance of electric impedance analyzer in ladder network, so as to
The impact of p-wire impedance parameter is eliminated, measuring accuracy is improved.
Each technical characteristic of embodiment described above arbitrarily can be combined, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more concrete and detailed, but and
Therefore can not be construed as limiting the scope of the patent.It should be pointed out that for one of ordinary skill in the art comes
Say, without departing from the inventive concept of the premise, some deformations and improvement can also be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (6)
1. the impedance operator test device of a kind of capacitive apparatus, it is characterised in that including electric impedance analyzer, the first cable, second
Cable and electric capacity；
The one end of one end of the electric impedance analyzer by first cable connection to measured capacitive equipment, the impedance analysis
The other end of the other end of instrument by second cable connection to the measured capacitive equipment；
The electric capacity is connected in parallel between first cable and second cable, so that first cable and described
The difference of the wave impedance of two cables and the internal impedance of the electric impedance analyzer is in setting range.
2. the impedance operator test device of capacitive apparatus according to claim 1, it is characterised in that the first cable bag
The N section single-core cables being sequentially connected are included, second cable includes the N section single-core cables being sequentially connected, and the electric capacity is N-1
Individual, N is the positive integer more than 1；
Capacitance connection described in k-th between k-th tie point of k-th tie point and the second cable of first cable,
To form ladder network；K-th tie point of first cable is the kth section single-core cable and kth+1 of first cable
The tie point of section single-core cable, k-th tie point of second cable are the kth section single-core cable of second cable and the
The tie point of k+1 section single-core cables；K is positive integer, and 1≤k≤N-1.
3. the impedance operator test device of capacitive apparatus according to claim 2, it is characterised in that first cable and
Single-core cable in second cable is the single-core cable for being provided with screen layer.
4. the impedance operator test device of capacitive apparatus according to claim 2, it is characterised in that in first cable
The length of kth section single-core cable is identical with the length of kth section single-core cable in second cable, and each section of single-core cable
Length is respectively less than or equal to 1/10th of wavelength to be measured.
5. the impedance operator test device of capacitive apparatus according to claim 1 and 2, it is characterised in that also including shielding
Device, the screening arrangement wrap up the electric capacity.
6. the impedance operator test device of capacitive apparatus according to claim 2, it is characterised in that the capacitance of the electric capacity
For：
Wherein, CkFor the capacitance of k-th electric capacity, C is the electric capacity of the single-core cable unit length, and L is the single-core cable unit
The inductance of length, d is the length of kth section single-core cable in first cable, ZDFor the internal resistance of the electric impedance analyzer.
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| CN201610986865.9A CN106526324B (en) | 2016-11-09 | 2016-11-09 | The impedance operator test device of capacitive apparatus |
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| CN201610986865.9A CN106526324B (en) | 2016-11-09 | 2016-11-09 | The impedance operator test device of capacitive apparatus |
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| CN106526324B CN106526324B (en) | 2019-03-19 |
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Cited By (1)
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| CN109991478A (en) * | 2017-12-29 | 2019-07-09 | 致茂电子(苏州)有限公司 | Inductance measurement device and inductance measurement method |
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Effective date of registration: 20210604 Address after: 510700 3rd, 4th and 5th floors of building J1 and 3rd floor of building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: China Southern Power Grid Research Institute Co.,Ltd. Address before: 510080 water Donggang 8, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong. Patentee before: China Southern Power Grid Research Institute Co.,Ltd. Patentee before: CSG POWER GRID TECHNOLOGY RESEARCH CENTER |