CN205941704U - Transformer room is noise equivalent capacitance measuring equipment altogether - Google Patents
Transformer room is noise equivalent capacitance measuring equipment altogether Download PDFInfo
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- CN205941704U CN205941704U CN201620907193.3U CN201620907193U CN205941704U CN 205941704 U CN205941704 U CN 205941704U CN 201620907193 U CN201620907193 U CN 201620907193U CN 205941704 U CN205941704 U CN 205941704U
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Abstract
The utility model relates to a transformer room is noise equivalent capacitance measuring equipment altogether, this measuring equipment include signal transmitter, auxiliary transformer no. 1, auxiliary transformer no. 2 and signal receiver, through measuring signal receiver with signal generator's signal size is calculated and is reach the transformer room common mode effective capacitance CQ that awaits measuring. The utility model discloses it has the vice limit of current potential dead point end not have current potential dead point end, former limit not have the vice limit of current potential dead point end and have current potential dead point end and switching power supply output to have or not to connect that electromagnetic compatibility characteristic's common mode noise equivalent capacitance is difficult to theoretical analysis and measuring problem when being used for signifying the transformer real work under the earth circumstances, proposed an effectual measuring equipment all not have current potential dead point end, former limit to the vice limit in transformer among the switching power supply former limit.
Description
Technical field
This utility model is related to capacitance measurement field, and noise equivalent capacitance measurement sets more particularly to a kind of transformer bay altogether
Standby.
Background technology
Transformator is the transfer element of magnetic energy in circuit, in circuit design, typically only considers its sensibility reciprocal, coefficient of coup etc.
Magnetic parameter characteristic and loss parameter.But, in order to the working condition of transformator in the case of more preferable research trends, need to survey
Measure its dynamic characteristic.Between transformer primary secondary, only by the physical arrangement parameter such as insulation clearance between winding relative area and winding
The coupled capacitor determining, referred to as structure capacitive.And winding Potential distribution impact when considering real transformer work, can react
During side circuit work, common-mode noise effective capacitance is referred to as to the electric capacity of common mode conducted noise inhibitory action.Because transformator is around knot
Structure is complicated, may contain magnetic core, skeleton, winding, screen layer, insulating tape, barricade etc..When assessing its electromagnetic compatibility characteristic,
The size of traditional method its structure capacitive of general measure, the electromagnetism that this electric capacity and transformator are shown when side circuit works
There is very big difference in compatibility feature.
Transformer device structure electric capacity can be estimated in design, but actual value and estimated value often have gap.Work time-varying
Depressor common mode effective capacitance is difficult to measure.Between existing estimation transformer primary secondary, the method for coupled capacitor is as follows：1st, theoretical meter
Algorithm：By Theoretical Calculation, the size of pre-estimation transformer coupled capacitor.2nd, the instrument direct method of measurement：In transformator inoperative
Directly pass through LCR table or electric impedance analyzer under state to test in the Same Name of Ends of former secondary.Method of testing is as shown in figure 1,11,14 are
Transformer coupled capacitor to be measured, 121,151 is transformer primary side, and 122,152 is transformer secondary, and in figure 13 analytical tool is
Electric impedance analyzer or LCR table or Network Analyzer.The method can only record the static structure electric capacity of transformer primary secondary.3rd, patent
Common mode capacitance measuring apparatus and method（Notification number CN 101943717 B）Propose a kind of measurement isolation element common mode capacitance
Method and apparatus, cardinal principle figure is as shown in Figure 2.This utility model proposes a kind of to have two-port network and measure actual parameter
Measuring apparatus, can measure common mode capacitance between the transformer primary secondary having quiescent point.The method is for existing use net
The Two-port netwerk analytical tool such as network analyser measures the specific embodiments of voltage Qianghian common mode effective capacitance, but the method can not
Enough measure the common mode effective capacitance that former secondary does not have the transformator of voltage dead point, also have ignored the impact of ground capacity, actual feelings
Under condition, ground capacity size affects than larger on transformer bay common mode effective capacitance.
In above-mentioned prior art, method 1,2 be merely able to structure capacitive during Estimation and Measurement transformator static work it is impossible to
The distribution situation of current potential on winding during reflection transformator real work, said method all can not measure having when transformator works
Effect common mode capacitance.In different circuit, its mode of operation is different to transformator.Under different mode of operations, transformation
The Potential distribution producing on the winding of device former and deputy side is different, and therefore effectively the size of common-mode noise effective capacitance is not yet
Equally, what profit recorded in this way is static structure electric capacity between transformer primary, secondary, rather than during circuit real work pair
The dynamic capacity that common-mode noise works.Although method 3 can measure circuit of reversed excitation etc. such as the circuit topology of quiescent point
The common-mode noise electric capacity of transformator, but cannot measuring transformer two ends no off-position point power electronics topology as full-bridge electricity
Road, the common-mode noise electric capacity of forward converter.
Prior art all can not measure transformer primary secondary under working condition does not have the common mode effective capacitance of off-position point,
Nor measuring transformer pair end unearthed in the case of the impact to transformator common mode effective capacitance for the ground capacity.Under practical situation
When former limit is full-bridge rectification for full-bridge circuit or secondary, this side does not all have current potential dead point has it is difficult to record transformer bay common mode
Effect electric capacity.
This utility model is directed to the electromagnetic compatibility characteristic of transformator in electronic power converter, in particular for difference
Transformer circuit topology impact, winding Potential distribution, screen layer, magnetic is considered during transformator work in power electronics topology
The effective capacitance of the combined influences such as core, skeleton is that the measurement of common-mode noise effective capacitance proposes a kind of new accurate measurement side
Method, can have the common-mode noise effective capacitance measuring the former secondary no current potential dead point transformator being difficult at present record.
Content of the invention
In view of this, the purpose of this utility model is to provide a kind of transformer bay noise equivalent capacitive measuring device altogether, energy
Enough common-mode noise effective capacitances accurately measuring during transformator actual working state in various Power Electronic Circuit.
This utility model adopts below scheme to realize：A kind of transformer bay noise equivalent capacitive measuring device altogether, described survey
Amount equipment includes a signal projector, auxiliary transformer one, auxiliary transformer two and signal receiver；Described auxiliary transformer one
The turn ratio of primary and secondary side winding is N1：N2=1:1；The turn ratio of described auxiliary transformer two primary and secondary side winding is N3：N4=
1:1；Described auxiliary transformer one, the non-same polarity of the primary and secondary side of described auxiliary transformer two are connected to form and connect containing centre
The auxiliary transformer cascaded structure one of contact and the auxiliary transformer cascaded structure two containing intermediate connection point；Described signal transmitting
The positive pole of device is connected with one end of described auxiliary transformer cascaded structure one, and the negative pole of described signal projector is become with described auxiliary
The intermediate connection point of depressor cascaded structure one is connected；The two ends of described auxiliary transformer cascaded structure one in order to transformator to be measured
Former limit two ends be connected；The two ends of described auxiliary transformer cascaded structure two are in order to the two ends phase with the secondary of transformator to be measured
Even；Described measuring apparatus also include an equivalent ground capacity, one end of described equivalent ground capacity and described auxiliary transformer string
The intermediate connection point of connection structure two is connected, and the other end of described equivalent ground capacity is connected with the positive pole of described signal receiver；
The negative level of described signal receiver is connected with the negative pole of described signal projector.
Below scheme is also adopted to realize in this utility model：A kind of transformer bay noise equivalent capacitive measuring device altogether, institute
State measuring apparatus and include a signal projector, auxiliary transformer one and signal receiver；Described auxiliary transformer one former limit and pair
The turn ratio of side winding is N1：N2=1:1；The non-same polarity of the primary and secondary side of described auxiliary transformer one be connected to form containing in
Between junction point auxiliary transformer cascaded structure one；The positive pole of described signal projector and described auxiliary transformer cascaded structure one
One end be connected, the negative pole of described signal projector is connected with the intermediate connection point of described auxiliary transformer cascaded structure one；Institute
The two ends stating auxiliary transformer cascaded structure one are in order to be connected with the two ends of the former limit of transformator to be measured；Described measuring apparatus are also wrapped
Include an equivalent ground capacity, one end of described equivalent ground capacity is in order to the current potential dead point end and phase with transformer secondary to be measured
Even, the other end of described equivalent ground capacity is connected with the positive pole of described signal receiver；The negative level of described signal receiver with
The negative pole of described signal projector is connected.
Below scheme is also adopted to realize in this utility model：A kind of transformer bay noise equivalent capacitive measuring device altogether, institute
State measuring apparatus and include a signal projector, auxiliary transformer two and signal receiver；Described auxiliary transformer two former limit and pair
The turn ratio of side winding is N3：N4=1:1；The non-same polarity of the primary and secondary side of described auxiliary transformer two be connected to form containing in
Between junction point auxiliary transformer cascaded structure two；The positive pole of described signal projector is in order to the electricity with the secondary of transformator to be measured
Position dynamic point end is connected, and the negative pole of described signal projector is in order to be connected with the current potential dead point end of the secondary of transformator to be measured；Described
The two ends of auxiliary transformer cascaded structure two are in order to be connected with the two ends of the secondary of transformator to be measured；Described measuring apparatus also include
One equivalent ground capacity, the intermediate connection point phase of one end of described equivalent ground capacity and described auxiliary transformer cascaded structure two
Even, the other end of described equivalent ground capacity is connected with the positive pole of described signal receiver；The negative level of described signal receiver with
The negative pole of described signal projector is connected.
Further, described signal projector and signal receiver include a frequency spectrum analyser, an EMI receiver and
Network Analyzer.
Further, when in power supply, institute's outlet side is not attached to the earth, by one end of a LCR table and described transformation to be measured
Device is connected, another parasitic capacitance terminating the earth or ground wire, measuring between the current potential dead point of power supply outlet side and the earth, described equivalent
Ground capacity CGCapacitance size in the same size with described parasitic capacitance.
Further, when in power supply, institute's outlet side is connected with the earth, described equivalent ground capacity CGReplaced with short-circuit line.
Compared with prior art, this utility model has the advantages that：1st, make use of the coupling between measuring transformer
Close voltage to cancel each other so that Two-port netwerk instrument is not directly connected on transformator jump in potential point, any power electronics can be measured
Transformator in topology, is widely used.2nd, consider that ground capacity affects, the transformer bay common mode equivalent electric capacity measured is more
Accurately, there is actual reference significance.3rd, this technical scheme applies the feature of electric impedance analyzer, can measure change authentic and validly
The common-mode noise effective capacitance of transformator under current intelligence during depressor work, under the transformator current intelligence of solution, EMI characteristic is surveyed
The difficult problem of examination.4th, transformator need not be transformed, method is simply easy to implement.
Brief description
Fig. 1 is the test circuit schematic diagram of prior art.
Fig. 2 is the measuring apparatus schematic diagram of the common mode capacitance of prior art.
Fig. 3 is the measuring apparatus wiring schematic diagram in this utility model when former secondary all no current potential dead points.
Fig. 4 is that in this utility model, the measuring apparatus wiring when no current potential dead point secondary has current potential dead point to former limit is illustrated
Figure.
Fig. 5 is when the measuring apparatus wiring when former limit has current potential dead point secondary no current potential dead point is illustrated in this utility model
Figure.
Fig. 6 is this utility model embodiment Central Plains end full-bridge inverting pair end full bridge rectifier topological diagram.
Fig. 7 is transformator common-mode noise effective capacitance measuring circuit illustraton of model to be measured in this utility model embodiment.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment is described further to this utility model.
The present embodiment provides a kind of transformer bay noise equivalent capacitive measuring device altogether, as shown in figure 3, when to be measured in power supply
Transformer primary side and secondary all no current potential dead point end when, described measuring apparatus include a signal projector, auxiliary transformer one, auxiliary
Help transformator two and signal receiver；The turn ratio of described auxiliary transformer one primary and secondary side winding is N1：N2=1:1；Described auxiliary
The turn ratio helping transformator two primary and secondary side winding is N3：N4=1:1；Described auxiliary transformer one, described auxiliary transformer two
The non-same polarity of primary and secondary side is connected to form the auxiliary transformer cascaded structure one containing intermediate connection point and connects containing centre
The auxiliary transformer cascaded structure two of contact；The positive pole of described signal projector and the one of described auxiliary transformer cascaded structure one
End is connected, and the negative pole of described signal projector is connected with the intermediate connection point of described auxiliary transformer cascaded structure one；Described auxiliary
The two ends helping transformer series structure one are in order to be connected with the two ends of the former limit of transformator to be measured；Described auxiliary transformer tandem junction
The two ends of structure two are in order to be connected with the two ends of the secondary of transformator to be measured；Described measuring apparatus also include an equivalent ground capacity,
One end of described equivalent ground capacity is connected with the intermediate connection point of described auxiliary transformer cascaded structure two, described equivalent ground connection
The other end of electric capacity is connected with the positive pole of described signal receiver；The negative level of described signal receiver and described signal projector
Negative pole is connected.
The present embodiment also provides a kind of transformer bay noise equivalent capacitive measuring device altogether, as shown in figure 4, work as treating in power supply
Survey transformer primary side when no current potential dead point end, secondary have current potential dead point end, described measuring apparatus include a signal projector, auxiliary
Transformator one and signal receiver；The turn ratio of described auxiliary transformer one primary and secondary side winding is N1：N2=1:1；Described auxiliary
The non-same polarity of the primary and secondary side of transformator one is connected to form the auxiliary transformer cascaded structure one containing intermediate connection point；Institute
The positive pole stating signal projector is connected with one end of described auxiliary transformer cascaded structure one, the negative pole of described signal projector with
The intermediate connection point of described auxiliary transformer cascaded structure one is connected；The two ends of described auxiliary transformer cascaded structure one in order to
The two ends of the former limit of transformator to be measured are connected；Described measuring apparatus also include an equivalent ground capacity, described equivalent ground capacity
One end in order to the current potential dead point end of transformer secondary to be measured be connected, the other end of described equivalent ground capacity and described letter
The positive pole of number receptor is connected；The negative level of described signal receiver is connected with the negative pole of described signal projector.
The present embodiment also provides a kind of transformer bay noise equivalent capacitive measuring device altogether, as shown in figure 5, work as treating in power supply
Survey transformer primary side have current potential dead point end, secondary no current potential dead point end when, described measuring apparatus include a signal projector, auxiliary
Transformator two and signal receiver；The turn ratio of described auxiliary transformer two primary and secondary side winding is N3：N4=1:1；Described auxiliary
The non-same polarity of the primary and secondary side of transformator two is connected to form the auxiliary transformer cascaded structure two containing intermediate connection point；Institute
The positive pole stating signal projector in order to be connected with the current potential dynamic point end of the secondary of transformator to be measured, the negative pole of described signal projector
In order to be connected with the current potential dead point end of the secondary of transformator to be measured；The two ends of described auxiliary transformer cascaded structure two in order to treat
The two ends surveying the secondary of transformator are connected；Described measuring apparatus also include an equivalent ground capacity, described equivalent ground capacity
One end is connected with the intermediate connection point of described auxiliary transformer cascaded structure two, the other end of described equivalent ground capacity with described
The positive pole of signal receiver is connected；The negative level of described signal receiver is connected with the negative pole of described signal projector.
In the present embodiment, described signal projector and signal receiver include a frequency spectrum analyser, an EMI receiver with
And a Network Analyzer.
In the present embodiment, described signal projector includes singal source resistance, HF signal generator；Described auxiliary transformation
The turn ratio of device one primary and secondary side winding is N1：N2=1:1；The turn ratio of described auxiliary transformer two primary and secondary side winding is N3：
N4=1:1.
In the present embodiment, described signal projector and signal receiver include a frequency spectrum analyser, an EMI receiver with
And a Network Analyzer.
In the present embodiment, when in power supply, institute's outlet side is not attached to the earth, will be to be measured with described for one end of a LCR table
Transformator is connected, another parasitic capacitance terminating the earth or ground wire, measuring between the current potential dead point of power supply outlet side and the earth, described
Equivalent ground capacity CGCapacitance size in the same size with described parasitic capacitance.
In the present embodiment, when in power supply, institute's outlet side is connected with the earth, described equivalent ground capacity CGUse short-circuit line
Replace.
In the present embodiment, calculated by the signal magnitude of described signal receiver and described signal generator described
Transformer bay common mode effective capacitance C to be measuredQ.
In the present embodiment, when in described power supply, institute's outlet side is not attached to the earth, it is calculated according to below equation
Described transformer bay common mode effective capacitance C to be measuredQ：
WhereinfFor high frequency pumping source frequency,ILInsertion loss for signal projector；
When institute's outlet side is connected with the earth in described power supply, described transformer bay to be measured is calculated according to below equation
Common mode effective capacitance CQ：
WhereinfFor high frequency pumping source frequency,ILInsertion loss for signal projector.
In the present embodiment, the wiring diagram of Fig. 3 can measure the former secondary such as former limit full-bridge inverting pair end full bridge rectifier
The power electronics of all no current potential dead points is topological, and circuit topology figure is as shown in Figure 6.When circuit pair end is unearthed, in real work
Ground capacity is had, C in such as Fig. 6 between circuit pair end and groundG, its size can affect the big of transformer bay common mode effective capacitance
Little.
In the present embodiment, the wiring diagram of Fig. 4 can measure former limit full-bridge inverting pair end half rectification circuit or double tube positive exciting
The former limits such as circuit, LLC circuit no current potential dead point end secondary has the power electronics topology at current potential dead point end.
In the present embodiment, the wiring diagram of Fig. 5 can measure the former limits such as the push-pull circuit of rear end all wave rectification has current potential quiet
The power electronics topology at point end secondary no current potential dead point end.
In the present embodiment, below for Two-port netwerk apparatus measures Computing Principle and formulation process：
Fig. 7 is the simplification circuit model of Fig. 3 measuring circuit, wherein CQ、CGSeries connection collectively constitutes testing capacitance C, such as its electric capacity
Shown in the relation formula 1 of numerical value.
Formula 1
In Fig. 7,21 is 50 ohmages, and 22 is AC signal occurring source, and 3 is 50 ohmages.21st, 22 composition signals are sent out
Source of students, 3 is signal receiving end, and signal generating source produces the coupling by transformator for the signal, and its vice-side winding also can sense
Go out corresponding Potential distribution, and the corresponding quantity of electric charge can be induced.Because vice-side winding has charge inducing, will be in secondary
Form displacement current on winding, and the size of displacement current represents the rejection ability to common-mode noise for the transformator.Vice-side winding
The displacement current of upper formation is bigger, then explanation transformator is weaker to the rejection ability of common-mode noise.Can be calculated according to formula 2
The size of electric capacity C：
Formula 2
WhereinfFor high frequency pumping source frequency, IL is the Two-port netwerk insertion loss recording, and can be calculated according to formula 1 and 2
Transformer bay common mode effective capacitance CQ.
In the present embodiment, when in circuit topology former limit no current potential dead point secondary has current potential dead point when wiring diagram such as Fig. 5
Shown.For this circuit, except last computing formula 3 replaces aforementioned formula 2, and remove transformator to be measured secondary measurement voltage device
22 parts, other are identical with abovementioned steps：
Formula 3
When in circuit topology, former limit has current potential dead point secondary no current potential dead point, circuit diagram is as shown in Figure 6.For this kind of electricity
Road, except last computing formula 4 replaces aforementioned computing formula 2, and removes transformator to be measured secondary measurement voltage device 21 part, its
He is identical with abovementioned steps：
Formula 4
When the secondary termination of circuit under test has gone up the earth, that is, there is no ground capacity CGIn the case of, cancel step in implementation steps
1, that is, cancel and make equivalent ground capacity CG, according to different circuit topologies, can be directly according only to formula 2 or formula 3 or formula 4
Calculate common mode effective capacitance.
The foregoing is only preferred embodiment of the present utility model, all according to this utility model claim done equal
Deng change and modification, covering scope of the present utility model all should be belonged to.
Claims (6)
1. a kind of transformer bay altogether noise equivalent capacitive measuring device it is characterised in that：Described measuring apparatus include a signal and send out
Emitter, auxiliary transformer one, auxiliary transformer two and signal receiver；The circle of described auxiliary transformer one primary and secondary side winding
Than for N1：N2=1:1；The turn ratio of described auxiliary transformer two primary and secondary side winding is N3：N4=1:1；Described auxiliary transformer
First, the non-same polarity of the primary and secondary side of described auxiliary transformer two is connected to form the auxiliary transformer string containing intermediate connection point
Connection structure one and the auxiliary transformer cascaded structure two containing intermediate connection point；The positive pole of described signal projector and described auxiliary
One end of transformer series structure one is connected, in the negative pole of described signal projector and described auxiliary transformer cascaded structure one
Between junction point be connected；The two ends of described auxiliary transformer cascaded structure one are in order to be connected with the two ends of the former limit of transformator to be measured；
The two ends of described auxiliary transformer cascaded structure two are in order to be connected with the two ends of the secondary of transformator to be measured；Described measuring apparatus are also
Including equivalent ground capacity CG, the centre of one end of described equivalent ground capacity and described auxiliary transformer cascaded structure two connects
Contact is connected, and the other end of described equivalent ground capacity is connected with the positive pole of described signal receiver；Described signal receiver
Negative level is connected with the negative pole of described signal projector.
2. a kind of transformer bay altogether noise equivalent capacitive measuring device it is characterised in that：Described measuring apparatus include a signal and send out
Emitter, auxiliary transformer one and signal receiver；The turn ratio of described auxiliary transformer one primary and secondary side winding is N1：N2=1:
1；The non-same polarity of the primary and secondary side of described auxiliary transformer one is connected to form the auxiliary transformer string containing intermediate connection point
Connection structure one；The positive pole of described signal projector is connected with one end of described auxiliary transformer cascaded structure one, and described signal is sent out
The negative pole of emitter is connected with the intermediate connection point of described auxiliary transformer cascaded structure one；Described auxiliary transformer cascaded structure one
Two ends in order to be connected with the two ends of the former limit of transformator to be measured；Described measuring apparatus also include equivalent ground capacity CG, institute
State one end of equivalent ground capacity in order to the current potential dead point end of transformer secondary to be measured be connected, described equivalent ground capacity
The other end is connected with the positive pole of described signal receiver；The negative level of described signal receiver and the negative pole phase of described signal projector
Even.
3. a kind of transformer bay altogether noise equivalent capacitive measuring device it is characterised in that：Described measuring apparatus include a signal and send out
Emitter, auxiliary transformer two and signal receiver；The turn ratio of described auxiliary transformer two primary and secondary side winding is N3：N4=1:
1；The non-same polarity of the primary and secondary side of described auxiliary transformer two is connected to form the auxiliary transformer string containing intermediate connection point
Connection structure two；The positive pole of described signal projector in order to be connected with the current potential dynamic point end of the secondary of transformator to be measured, described signal
The negative pole of emitter is in order to be connected with the current potential dead point end of the secondary of transformator to be measured；Described auxiliary transformer cascaded structure two
Two ends are in order to be connected with the two ends of the secondary of transformator to be measured；Described measuring apparatus also include equivalent ground capacity CG, described
One end of equivalent ground capacity is connected with the intermediate connection point of described auxiliary transformer cascaded structure two, described equivalent ground capacity
The other end be connected with the positive pole of described signal receiver；The negative level of described signal receiver and the negative pole of described signal projector
It is connected.
4. a kind of transformer bay according to claim 1,2 or 3 altogether noise equivalent capacitive measuring device it is characterised in that：
Described signal projector and signal receiver include a frequency spectrum analyser, an EMI receiver and a Network Analyzer.
5. a kind of transformer bay according to claim 1,2 or 3 altogether noise equivalent capacitive measuring device it is characterised in that：
When in power supply, institute's outlet side is not attached to the earth, one end of a LCR table is connected with described transformator to be measured, another termination is big
Ground or ground wire, the parasitic capacitance between the current potential dead point of measurement power supply outlet side and the earth, described equivalent ground capacity CGElectric capacity
Size is in the same size with described parasitic capacitance.
6. a kind of transformer bay according to claim 1,2 or 3 altogether noise equivalent capacitive measuring device it is characterised in that：
When in power supply, institute's outlet side is connected with the earth, described equivalent ground capacity CGReplaced with short-circuit line.
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| CN201620907193.3U CN205941704U (en) | 2016-08-20 | 2016-08-20 | Transformer room is noise equivalent capacitance measuring equipment altogether |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490269A (en) * | 2018-05-02 | 2018-09-04 | 西安交通大学 | A kind of experimental measurement method of transformer parasitic capacitance |
| CN109782073A (en) * | 2018-12-14 | 2019-05-21 | 华北电力大学（保定） | A kind of twin-core power line unit length parametric solution method |
-
2016
- 2016-08-20 CN CN201620907193.3U patent/CN205941704U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490269A (en) * | 2018-05-02 | 2018-09-04 | 西安交通大学 | A kind of experimental measurement method of transformer parasitic capacitance |
| CN109782073A (en) * | 2018-12-14 | 2019-05-21 | 华北电力大学（保定） | A kind of twin-core power line unit length parametric solution method |
| CN109782073B (en) * | 2018-12-14 | 2021-03-02 | 华北电力大学（保定） | Method for solving unit length parameter of dual-core power line |
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