CN107561368A - A kind of measuring system and measuring method of large scale electrical power unit wideband impedance operator - Google Patents
A kind of measuring system and measuring method of large scale electrical power unit wideband impedance operator Download PDFInfo
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Abstract
The invention discloses a kind of measuring system and measuring method of large scale electrical power unit wideband impedance operator.At present, not yet it has been proposed that measuring the mode of connection of large scale electrical power unit wideband impedance operator using longer coaxial cable.The measuring system of the present invention includes electric impedance analyzer, the measurement port of described electric impedance analyzer connects two first coaxial cables, screen layer two sides earth or top the ground connection end short circuit of two described first coaxial cables, the cored wire end of two first coaxial cables is used to connect equipment under test.The present invention is using any of two kinds of connected modes of coaxial cable shielding layer, that is screen layer two sides earth or screen layer head end ground connection end short circuit, can eliminates influence of the long cable spatial position change to cable electrical parameter, and the measurement result of power equipment wideband impedance operator is accurate.
Description
Technical field
The present invention relates to power equipment feature measurement field, specifically a kind of large scale electrical power unit wideband impedance operator
Measuring system and measuring method.
Background technology
The wideband modeling of power equipment is widely used in Electromagnetic Transient Analysis of Power System and analyzed with electromagnetic disturbance.Electric power
The wideband impedance operator of equipment is to carry out the basis of wideband modeling.Power equipment wideband model, which can be divided into, actual physical meaning
Mechanism model and black-box model., need to be by the wideband impedance operator of established model when establishing the mechanism model of power equipment
The wideband impedance operator obtained with actual measurement is contrasted, and the correctness of model is established with checking.Establishing black-box model
During, wideband impedance operator is even more the foundation modeled.Therefore, the wideband impedance operator of power equipment is accurately measured to wideband
Modeling has great importance.
At present, the main method of testing of power equipment broadband properties has：Mensuration based on electric impedance analyzer, based on network
The multiport circuit method and time domain impulse mensuration of analyzer.First two method of testing can use ripe business measurement to set
It is standby, there is higher measurement accuracy and easy to operate, be widely used in wideband testing impedance field.
The measuring principle of electric impedance analyzer mainly has：Balanced bridge, voltage x current method (I-V).Both approaches are required to
Test equipment is connected with measurand using suitable fixture or/and lead.Due to the more application scenarios of electric impedance analyzer
The impedance operator measurement of Small electronic component or material, thus the measured material that equipment manufacturer provides can not meet to measure it is large-scale
The needs of power equipment.Typically had to when measuring the wideband impedance operator of large scale electrical power unit using longer measurement electricity
Cable.The factors such as the resistance of cable itself, electric capacity, inductance can significant impact measurement result, and the rise with frequency and electricity
Influence of the growth of cable length to result is more serious.For this problem, have document both at home and abroad and disclose some researchs, main
Content is the influence using the method check test cable for calculating or measuring based on transmission line theory；Wherein, verified using calculating
Mode need to know accurate cable unit length parameter, have certain limitation in the application；The method of measurement verification refers to
The mode of " open circuit, short circuit, load checking " is utilized to eliminate the influence of long lead." although open circuit, short circuit, load checking " is a kind of
More ripe method, but verification effect is influenceed by factors such as cable connections in actual applications.At present, not yet someone
It is proposed the mode of connection using longer coaxial cable measurement large scale electrical power unit wideband impedance operator.
The content of the invention
The technical problems to be solved by the invention are the defects of overcoming above-mentioned prior art to exist, there is provided a kind of large-scale power
The measuring system of equipment wideband impedance operator, it ensures measurement with the electric parameter of long cable not with the locus of measuring loop
Change and change, to eliminate influence of the long cable spatial position change to cable electrical parameter, make the impedance of power equipment wideband special
The measurement result of property is accurate.
Therefore, the present invention adopts the following technical scheme that：A kind of measuring system of large scale electrical power unit wideband impedance operator,
Including electric impedance analyzer, measurement port two first coaxial cables of connection of described electric impedance analyzer, described two first
Screen layer two sides earth or top the ground connection end short circuit of coaxial cable, the cored wire end of two first coaxial cables is used to connect
Equipment under test.
Need to use longer measurement electricity because equipment under test size is larger, when measuring power equipment wideband impedance operator
Cable.When electric impedance analyzer carries out " open circuit, short circuit, load checking " and measurement power equipment impedance operator, cable space bit
Putting to change.Therefore, the wideband impedance operator of power equipment is adequately measured, it is necessary to ensure that measuring loop (use by measurement
Long cable) electric parameter do not change with the spatial position change of measuring loop.Therefore, the present invention uses coaxial cable shield
Any of two kinds of connected mode of layer, i.e. screen layer two sides earth or screen layer head end ground connection end short circuit, it is possible to eliminate
Influence of the long cable spatial position change to cable electrical parameter.
When the measurement port of the electric impedance analyzer is two, using following additional project：
A BNC connector and two described first coaxial electricals is respectively adopted in two measurement ports of the electric impedance analyzer
Cable connects.
Two described BNC connector shells use a metallic plate short circuit, make the beginning of the screen layer of two first coaxial cables
End is all grounded.
When the measurement port of the electric impedance analyzer is four, using following additional project：
Four measurement ports of described electric impedance analyzer are first coaxial by four turns of two fixtures and described two
Cable connection, two output ports of four turn of two fixture are connected with two first coaxial cables respectively, four turn of two fixture
Four input ports connect with corresponding electric impedance analyzer measurement port respectively.
Four turn of two described fixture includes four second coaxial cables, two BNC three-way connections and four BNC connectors, the
The top of two coaxial cables is connected using BNC connector with corresponding electric impedance analyzer measurement port, and adjacent two second coaxial
The end of cable is connected using a BNC three-way connections with the top of first coaxial cable.
Four described BNC connector shells use a metallic plate short circuit, make the beginning of the screen layer of four second coaxial cables
End is all grounded.
The present invention also provides the method that the measuring system of above-mentioned two electric impedance analyzer measurement ports of band measures, and it is walked
It is rapid as follows：
1) " the open circuit, short circuit " checking routine carried using electric impedance analyzer is verified；
2) the first coaxial cable of two appropriate lengths is connected in two measurement ports of electric impedance analyzer, and selects two kinds
One kind in screen layer connected mode, i.e., the screen layer two sides earth or top ground connection end short circuit of two first coaxial cables；
3) the terminal open circuit measurement open-circuit impedance characteristic Z of the first coaxial cableo；The end short circuit measurement of first coaxial cable
Short-circuit impedance Zs；The last terminating load of first coaxial cable, measurement load impedance characteristic Zlm；The actual impedance of direct measurement load
Characteristic Zl；
3) end of the first coaxial cable connects equipment under test, and measurement obtains the wideband impedance Z of equipment under testxm；
4) the impedance operator Z after power equipment verification is obtained with measurement data verification using check formulax, check formula is such as
Under：
The present invention also provides the method that the measuring system of above-mentioned four electric impedance analyzer measurement ports of band measures, and it is walked
It is rapid as follows：
1) four turn of two fixture is arranged on electric impedance analyzer, and " the open circuit, short circuit " school carried using electric impedance analyzer
Program is tested to be verified；
2) the first coaxial cable of two appropriate lengths is connected after four turn of two fixture, and selects two kinds of screen layer connection sides
One kind in formula, i.e., the screen layer two sides earth or top ground connection end short circuit of two first coaxial cables；
3) the terminal open circuit measurement open-circuit impedance characteristic Z of the first coaxial cableo；The end short circuit measurement of first coaxial cable
Short-circuit impedance Zs；The last terminating load of first coaxial cable, measurement load impedance characteristic Zlm；The actual impedance of direct measurement load
Characteristic Zl；
3) end of the first coaxial cable connects equipment under test, and measurement obtains the wideband impedance Z of equipment under testxm；
4) the impedance operator Z after power equipment verification is obtained with measurement data verification using check formulax, check formula is such as
Under：
It is the device have the advantages that as follows：The present invention uses special coaxial cable shielding layer connected mode, ensures
Measurement is not changed with the electric parameter of long cable with the spatial position change of measuring loop, eliminates long cable locus
Change the influence to cable electrical parameter, the measurement result of power equipment wideband impedance operator is accurate.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention 1；
Fig. 2 is another connected mode schematic diagram of two first coaxial cable shielding layers in the embodiment of the present invention 1；
Fig. 3 is the structural representation of the embodiment of the present invention 2；
Fig. 4 is the structural representation of four turn of two fixture in the embodiment of the present invention 2；
Fig. 5 is another connected mode schematic diagram of two first coaxial cable shielding layers in the embodiment of the present invention 2；
Fig. 6 is that (in Fig. 6, the ordinate of upper figure is amplitude to the earth-free measurement result figure of coaxial cable shielding layer, figure below
Ordinate is phase angle)；
Fig. 7 be coaxial cable shielding layer only top ground connection measurement result figure (in Fig. 7, the ordinate of upper figure is amplitude, under
The ordinate of figure is phase angle)；
Fig. 8 is that (in Fig. 8, the ordinate of upper figure is amplitude, figure below for the measurement result figure of coaxial cable shielding layer two sides earth
Ordinate be phase angle)；
Fig. 9 be coaxial cable shielding layer top be grounded end short circuit measurement result figure (in Fig. 9, the ordinate of upper figure is
Amplitude, the ordinate of figure below is phase angle)；
In Fig. 6-9, A represents result measured directly, and B represents that, using the result for drawing wire spacing d1 measurements, C represents to use
Draw the result of wire spacing d2 measurements, D is represented using the result for drawing wire spacing d3 measurements；
Figure 10 is that (in Figure 10, the ordinate of upper figure is amplitude to the front and rear control schematic diagram of measurement result verification, and figure below is indulged
Coordinate is phase angle).
In figure, 1- electric impedance analyzers, the coaxial cables of 2- first, 3- screen layers, 4- cored wires, 5-BNC joints, 6- metallic plates,
Tetra- turn of two fixture of 7-, the coaxial cables of 8- second, 9-BNC three-way connections.
Embodiment
With reference to specification drawings and specific embodiments, the invention will be further described.
Embodiment 1
A kind of measuring system of large scale electrical power unit wideband impedance operator as shown in Figure 1, the measurement end of electric impedance analyzer 1
Mouth two first coaxial cables 2 of connection, the top of the screen layer 3 ground connection end short circuit of described two first coaxial cables 2, two
The end of cored wire 4 of first coaxial cable 2 is used to connect equipment under test.
The measurement port of the electric impedance analyzer 1 is two, and a BNC connector 5 and described two first is respectively adopted
Coaxial cable 2 connects.Two described BNC connector shells use the short circuit of metallic plate 6.
The screen layer 3 of two first coaxial cables 2 can also use two sides earth (beginning, end is grounded), such as Fig. 2 institutes
Show, can equally reach the purpose of the present invention.
It is as follows that above-mentioned measuring system carries out the step of wideband impedance operator measurement：
1) " the open circuit, short circuit " checking routine carried using electric impedance analyzer is verified；
2) the first coaxial cable of two appropriate lengths is connected in two measurement ports of electric impedance analyzer, and selects two kinds
One kind in screen layer connected mode, i.e., the screen layer two sides earth or top ground connection end short circuit of two first coaxial cables；
3) the terminal open circuit measurement open-circuit impedance characteristic Z of the first coaxial cableo；The end short circuit measurement of first coaxial cable
Short-circuit impedance Zs；The last terminating load of first coaxial cable, measurement load impedance characteristic Zlm；The actual impedance of direct measurement load
Characteristic Zl；
3) end of the first coaxial cable connects equipment under test, and measurement obtains the wideband impedance Z of equipment under testxm；
4) the impedance operator Z after power equipment verification is obtained with measurement data verification using check formulax, check formula is such as
Under：
Embodiment 2
A kind of measuring system of large scale electrical power unit wideband impedance operator as shown in Figure 3, described electric impedance analyzer 1
Four measurement ports are connected by four turn of two fixture 7 with two described first coaxial cables 2.As shown in figure 4, described four turns
Two fixtures 7 include four second coaxial cables, 8, two BNC three-way connections 9 and four BNC connectors 5, the beginning of the second coaxial cable 8
End is connected using BNC connector 5 with the corresponding measurement port of electric impedance analyzer 1, and the end of adjacent two second coaxial cables 8 is adopted
It is connected with BNC three-way connections 9 with the top of first coaxial cable 2.Four described shells of BNC connector 5 use metallic plate 6
Short circuit.The top of the screen layer 3 ground connection end short circuit of two described first coaxial cables 2, the cored wire of two first coaxial cables 2
4 ends are used to connect equipment under test.
The screen layer 3 of two first coaxial cables 2 can also use two sides earth (beginning, end is grounded), such as Fig. 5 institutes
Show, can equally reach the purpose of the present invention.
It is as follows that above-mentioned measuring system carries out the step of wideband impedance operator measurement：
1) four turn of two fixture is arranged on electric impedance analyzer, and " the open circuit, short circuit " school carried using electric impedance analyzer
Program is tested to be verified；
2) the first coaxial cable of two appropriate lengths is connected after four turn of two fixture, and selects two kinds of screen layer connection sides
One kind in formula, i.e., the screen layer two sides earth or top ground connection end short circuit of two first coaxial cables；
3) the terminal open circuit measurement open-circuit impedance characteristic Z of the first coaxial cableo；The end short circuit measurement of first coaxial cable
Short-circuit impedance Zs；The last terminating load of first coaxial cable, measurement load impedance characteristic Zlm；The actual impedance of direct measurement load
Characteristic Zl；
3) end of the first coaxial cable connects equipment under test, and measurement obtains the wideband impedance Z of equipment under testxm；
4) the impedance operator Z after power equipment verification is obtained with measurement data verification using check formulax, check formula is such as
Under：
Measured using above-mentioned measuring system and measuring method in labs.Using the electric impedance analyzer of Agilent 4294 with
Two root long 15m cable measures 220V power transformers 40-10MHz wideband impedance.Any three groups of setting is different to draw
Coaxial cable distance d in wire spacing, i.e. Fig. 6-9, difference d1=0, d2=0.5m, d3=1.5m.Wherein in lead distance
For d2, d3 when, change the ground clearance of two cables.Two coaxial cable shielding layers are measured respectively under each lead distance
Earth-free, screen layer only top ground connection, screen layer two sides earth, screen layer top ground connection and test product transformer during the short circuit of end
Wideband impedance operator.As a result as shown in the figure.Fig. 6 and Fig. 7 corresponds to difference lead pitch when screen layer is earth-free, only top is grounded respectively
From measurement result, the measurement result of three lead distances has difference larger in figure.And Fig. 8 and Fig. 9 correspond to top ground connection and end
The measurement result of difference lead distance when holding short circuit, screen layer two sides earth, three measurement results for drawing wire spacing are consistent
's.Therefore illustrate no longer to influence measuring loop ginseng when coaxial cable shielding layer is grounded and forms loop time space change in location
Number.
The screen layer mode of connection of the present invention eliminates influence of the lead locus to cable electrical parameter, recycles
" open circuit, short circuit, load checking ", which can reach, eliminates the purpose that long lead influences on measurement result.Small transformers are verified
Result afterwards is as shown in Figure 10, and curve A is small transformers result measured directly (real impedance value) in figure, and curve B is with length
The result (before verification) of lead measurement, curve C is the result after being verified.It can be seen that verification after result with
The real impedance value of small transformers coincide substantially, therefore the above method can eliminate influence of the long lead to measurement result.
Claims (8)
1. a kind of measuring system of large scale electrical power unit wideband impedance operator, including electric impedance analyzer (1), it is characterised in that institute
The measurement port for the electric impedance analyzer (1) stated connects two first coaxial cables (2), the screen of described two first coaxial cables
Layer (3) two sides earth or top ground connection end short circuit are covered, cored wire (4) end of two first coaxial cables is used to connect tested set
It is standby.
2. measuring system according to claim 1, it is characterised in that the measurement port of the electric impedance analyzer (1) is two
It is individual, a BNC connector (5) is respectively adopted and is connected with two described first coaxial cables (2).
3. measuring system according to claim 2, it is characterised in that two described BNC connector (5) shells use a gold medal
Belong to plate (6) short circuit.
4. measuring system according to claim 1, it is characterised in that the measurement port of described electric impedance analyzer (1) is
Four, it is connected by four turns of two fixtures (7) with two described first coaxial cables (2), four turn of two fixture (7)
Two output ports are connected with two first coaxial cables (2) respectively, four input ports of four turn of two fixture (7) respectively with it is right
Electric impedance analyzer (1) measurement port connection answered.
5. measuring system according to claim 4, it is characterised in that four turn of two described fixture (7) includes four second
Coaxial cable (8), two BNC three-way connections (9) and four BNC connectors (5), the top of the second coaxial cable (8) are connect using BNC
Head (5) connects with corresponding electric impedance analyzer (1) measurement port, and the end of adjacent two second coaxial cables (8) uses one
BNC three-way connections (9) are connected with the top of first coaxial cable (2).
6. measuring system according to claim 5, it is characterised in that four described BNC connector (5) shells use a gold medal
Belong to plate (6) short circuit.
7. the method measured using measuring system described in Claims 2 or 33, its step is as follows：
1) " the open circuit, short circuit " checking routine carried using electric impedance analyzer is verified；
2) the first coaxial cable of two appropriate lengths is connected in two measurement ports of electric impedance analyzer, and selects two kinds of shieldings
One kind in layer connected mode, i.e., the screen layer two sides earth or top ground connection end short circuit of two first coaxial cables；
3) the terminal open circuit measurement open-circuit impedance characteristic Z of the first coaxial cableo；The end short circuit measurement short circuit of first coaxial cable
Impedance Zs；The last terminating load of first coaxial cable, measurement load impedance characteristic Zlm；The actual impedance characteristic of direct measurement load
Zl；
3) end of the first coaxial cable connects equipment under test, and measurement obtains the wideband impedance Z of equipment under testxm；
4) the impedance operator Z after power equipment verification is obtained with measurement data verification using check formulax, check formula is as follows：
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8. the method measured using the measuring system of claim 4,5 or 6, its step are as follows：
1) four turn of two fixture is arranged on electric impedance analyzer, and " open circuit, short circuit " the verification journey carried using electric impedance analyzer
Sequence is verified；
2) the first coaxial cable of two appropriate lengths is connected after four turn of two fixture, and is selected in two kinds of screen layer connected modes
One kind, i.e., screen layer two sides earth or top the ground connection end short circuit of two first coaxial cables；
3) the terminal open circuit measurement open-circuit impedance characteristic Z of the first coaxial cableo；The end short circuit measurement short circuit of first coaxial cable
Impedance Zs；The last terminating load of first coaxial cable, measurement load impedance characteristic Zlm；The actual impedance characteristic of direct measurement load
Zl；
3) end of the first coaxial cable connects equipment under test, and measurement obtains the wideband impedance Z of equipment under testxm；
4) the impedance operator Z after power equipment verification is obtained with measurement data verification using check formulax, check formula is as follows：
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110286303A (en) * | 2019-07-10 | 2019-09-27 | 国家电网有限公司 | A kind of coaxial cable insulation cable ageing state appraisal procedure based on BP neural network |
| CN112881804A (en) * | 2021-01-18 | 2021-06-01 | 国网浙江省电力有限公司电力科学研究院 | Impedance spectrum measuring method and device for three-core cable |
| CN113281614A (en) * | 2021-05-18 | 2021-08-20 | 国网江苏省电力有限公司无锡供电分公司 | Power cable broadband impedance spectrum testing method |
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| CN113281614A (en) * | 2021-05-18 | 2021-08-20 | 国网江苏省电力有限公司无锡供电分公司 | Power cable broadband impedance spectrum testing method |
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