CN106872751B - Equivalent circuit model of equipotential shielding capacitor voltage transformer - Google Patents
Equivalent circuit model of equipotential shielding capacitor voltage transformer Download PDFInfo
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- CN106872751B CN106872751B CN201510920397.0A CN201510920397A CN106872751B CN 106872751 B CN106872751 B CN 106872751B CN 201510920397 A CN201510920397 A CN 201510920397A CN 106872751 B CN106872751 B CN 106872751B
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- 239000003990 capacitor Substances 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000004020 conductor Substances 0.000 claims abstract description 4
- 239000011159 matrix material Substances 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 4
- 230000006698 induction Effects 0.000 claims description 3
- 239000012212 insulator Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 abstract description 4
- 238000000605 extraction Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005350 ferromagnetic resonance Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000005457 optimization Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
Abstract
The invention provides an equivalent circuit model of an equipotential shielding capacitor voltage transformer, which comprises the following components: representing a capacitive voltage divider of the equipotential shielding capacitive voltage transformer by flanges of capacitor units forming the voltage divider; the charged bodies around the equipotential shielding capacitor voltage transformer are represented by top equalizing rings of the charged bodies; all charged body equalizing rings in the same-phase circuit of the transformer substation incoming line section are regarded as the same conductor; and determining the total number of charged bodies in the equivalent circuit model, numbering the charged bodies in sequence, and numbering the flanges and the equalizing rings equipotential with the flanges as a whole. The method lays a foundation for further accurately analyzing the additional error of the capacitor voltage transformer under the influence of the stray parameters; the invention reasonably simplifies the complex stray parameter network under the field working condition of the transformer substation, enhances the operability of stray parameter extraction, improves the efficiency of stray parameter extraction, and simultaneously ensures the high precision of calculation.
Description
Technical Field
The invention relates to a mutual inductor device of an electric power system, in particular to an equipotential shielding capacitor voltage mutual inductor.
Background
The capacitor voltage transformer (equipotential shielding capacitor voltage transformer) has the advantages of high insulating strength, capability of reducing the steepness of a lightning impulse wave head, no ferromagnetic resonance with a system, low manufacturing cost, capability of being used as a coupling capacitor for power line carrier communication and the like, is widely applied in the field of power systems, has a voltage range of 35 kV-1000 kV, and has a market share of more than 90% at a high voltage level of 110kV and above. With the development of electric power market trading, the requirement for measuring electric energy is higher and higher, and the development of a high-precision capacitor voltage transformer is inevitable.
There are many factors that affect the accuracy of an equipotential shielding capacitor voltage transformer, including electromagnetic cell errors, capacitive divider errors, and additional errors due to frequency, temperature, and proximity effects. An additional error caused by the proximity effect is that the actual voltage division ratio of the capacitive voltage divider deviates from the ideal voltage division ratio due to the stray capacitance between the surrounding grounding body or charged body and the equipotential shielding capacitive voltage transformer, so that the accuracy is reduced. And as the voltage level increases, the additional error caused by the stray capacitance increases, and documents indicate that when the 1000kV equipotential shielding capacitor voltage transformer actually operates, the additional error caused by the proximity effect reaches about 0.3%, and the influence on the accuracy of the equipotential shielding capacitor voltage transformer is not negligible. Therefore, the analysis of the influence of the stray capacitance on the accuracy of the equipotential shielding capacitor voltage transformer is of great significance for the development of the high-precision equipotential shielding capacitor voltage transformer.
However, the existing method for adding the error caused by the stray capacitance only has some experimental methods or approximate theoretical calculation, and no systematic method is researched. The invention provides an equivalent circuit model of an equipotential shielding capacitor voltage transformer by taking stray capacitance generated by the equipotential shielding capacitor voltage transformer in a transformer substation environment as a research object, wherein the equivalent circuit model can be conveniently used for calculating the stray capacitance of the equipotential shielding capacitor voltage transformer in the transformer substation field environment, and is a precondition for further calculating the actual voltage division ratio of the equipotential shielding capacitor voltage transformer to obtain the additional error generated by the stray capacitance to the equipotential shielding capacitor voltage transformer, thereby providing guidance for the design and optimization of the electrical parameters of the equipotential shielding capacitor voltage transformer.
Disclosure of Invention
In order to solve the problems, the invention provides an equivalent circuit model of an equipotential shielding capacitor voltage transformer, which can be conveniently used for calculating the stray capacitance of the equipotential shielding capacitor voltage transformer in the field environment of a transformer substation, is a precondition for further calculating the actual voltage division ratio of the equipotential shielding capacitor voltage transformer to obtain the additional error generated by the stray capacitance to the equipotential shielding capacitor voltage transformer, and further provides guidance for the design of the electrical parameters of the equipotential shielding capacitor voltage transformer and assists in the research and design of the equipotential shielding capacitor voltage transformer with higher precision and higher voltage level.
An equivalent circuit model of an equipotential shielding capacitor voltage transformer, comprising:
representing a capacitive voltage divider of the equipotential shielding capacitive voltage transformer by flanges of capacitor units forming the voltage divider;
the charged bodies around the equipotential shielding capacitor voltage transformer are represented by top equalizing rings of the charged bodies;
all charged body equalizing rings in the same-phase circuit of the transformer substation incoming line section are regarded as the same conductor;
and determining the total number of charged bodies in the equivalent circuit model, numbering the charged bodies in sequence, and numbering the flanges and the equalizing rings equipotential with the flanges as a whole.
The voltage transformer comprises an equipotential shielding capacitor unit, wherein the two ends of the equipotential shielding capacitor unit are provided with supporting flanges which are connected with each other.
The equipotential shielding capacitor unit comprises a main capacitor, an inner insulating material, a shielding capacitor, an annular electrode and an insulating sleeve, wherein the main capacitor, the inner insulating material, the shielding capacitor, the annular electrode and the insulating sleeve are arranged between the supporting flanges and are coaxially arranged from inside to outside in sequence.
The equipotential shielding capacitor type voltage transformer is characterized in that the equipotential shielding capacitor type voltage transformer is simplified into a three-phase equivalent model.
Wherein the equivalent circuit model comprises that the single equal potential shielding capacitor voltage transformer is equivalent to 7 electrodes.
The equivalent circuit model is used for 1000kV extra-high voltage equipotential shielding capacitor voltage transformers and capacitor voltage transformers of all voltage classes and all forms.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides an equivalent model for calculating an additional error of an equipotential shielding capacitor voltage transformer under the influence of stray parameters. An effective way is provided for quantitatively calculating stray parameters of the equipotential shielding capacitor voltage transformer, and a foundation is laid for further accurately analyzing additional errors of the capacitor voltage transformer under the influence of the stray parameters.
2. The equivalent model is simple and clear, a complex stray parameter network under the field working condition of the transformer substation is reasonably simplified, the complex stray parameter calculation process is avoided, the operability of stray parameter extraction is enhanced, the stray parameter extraction efficiency is improved, and meanwhile, the calculation high precision is ensured.
Drawings
FIG. 1 is a schematic diagram of a conductor label of an equipotential shielding capacitor voltage transformer;
FIG. 2 is a schematic cross-sectional view of a capacitor unit of an equipotential shielding capacitive voltage transformer;
fig. 3 is a schematic diagram of an arrangement scheme of electrical equipment of a 1000kV extra-high voltage substation line inlet segment in south-east of jin;
FIG. 4 is a schematic diagram of a Jinsoutheast 1000kV ultra-high voltage substation inlet line section three-phase equivalent model;
FIG. 5 is a schematic diagram of a circuit model of an equipotential shielding capacitor voltage transformer;
wherein, 1-a composite insulating sleeve flange; 2-a main capacitor; 3-an insulating material; 4-a composite insulating sleeve; 5-a shield capacitor; 6-GIS sleeve grading ring; 7-a ground switch grading ring; 8-equipotential shielding capacitor voltage transformer grading ring; 9-post insulator grading ring; 10-arrester grading ring.
Detailed Description
The method for establishing the equivalent model of the equipotential shielding capacitor voltage transformer is described in detail with reference to fig. 1 to 5:
step 1: a three-phase equivalent model of a transformer substation inlet line section is established according to the actual layout of 1000kV ultra-high voltage alternating-current transformer substation electrical equipment in the south of the east of the jin, and the three-phase equivalent model comprises a GIS sleeve, a grounding switch, an equipotential shielding capacitor type voltage transformer, a post insulator and a grading ring model of a lightning arrester. And reflecting the electrified state of the adjacent electrical equipment by the electrified state of each grading ring, representing the stray capacitance between each electrical equipment and the equipotential shielding capacitor voltage transformer by the capacitance between each grading ring and the equipotential shielding capacitor voltage transformer, and calculating the stray capacitance generated between each grading ring and the equipotential shielding capacitor voltage transformer.
Step 2: and (3) according to the established three-phase equivalent model of the transformer substation in the step 1, establishing an equivalent circuit model of the equipotential shielding capacitor voltage transformer under the influence of stray capacitance. The flanges of the three-phase equipotential shielding capacitor voltage transformer are numbered in sequence, the earth is made to be an electrode 0, and each equal potential shielding capacitor voltage transformer model can be simplified into 7 electrodes with 21 electrodes in total. Taking the model of the equipotential shielding capacitor type voltage transformer of the V phase as an example, the electrode 2 represents a top flange of the equipotential shielding capacitor type voltage transformer of the V phase and a voltage-sharing ring of all charged bodies of the V phase of a transformer substation incoming line segment; black electrodes 19, 20, 21 represent flanges between the main capacitors; the white electrodes 10, 11, 12 represent the flanges between the shield capacitors, and there is no electrical connection between the main capacitor and the shield capacitors. The stray capacitance of the equal potential shield capacitor voltage transformer model can be expressed by these 7 nodes. The schematic diagram of the circuit model is shown in fig. 5, and according to the model, the relation between the potential of each node and the capacitance can be obtained according to the formula (2-1) by using the extracted stray capacitance parameters and the capacitance parameters of the capacitive voltage divider.
Wherein:
in order to be at the earth potential,
u, V, W, respectively, are phase voltages of three phases,
q4～q21has a charge value of 0; ci,0Is the capacitance to ground of each electrode; ci,jIs the stray capacitance between the electrodes.
And (3) converting the distributed capacitance matrix [ C ] into an induction coefficient matrix [ beta ], and finally obtaining the equipotential shielding capacitor voltage transformer circuit equation with stray capacitance considered as shown in the formula (2-2).
The measurement error brought to the equipotential shielding capacitor voltage transformer by the stray capacitance can be further obtained by deducting only a partial capacitance matrix [ C ] or an induction coefficient matrix [ beta ] of the equipotential shielding capacitor voltage transformer.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (6)
1. An equivalent circuit modeling method for an equipotential shielding capacitor voltage transformer is characterized by comprising the following steps:
representing a capacitive voltage divider of the equipotential shielding capacitive voltage transformer by flanges of capacitor units forming the voltage divider;
the charged bodies around the equipotential shielding capacitor voltage transformer are represented by the top equalizing rings of the charged bodies, the charged state of each equalizing ring reflects the charged state of adjacent-phase electrical equipment, and the capacitance between each equalizing ring and the equipotential shielding capacitor voltage transformer reflects the stray capacitance between each electrical equipment and the equipotential shielding capacitor voltage transformer;
all charged body equalizing rings in the same-phase circuit of the transformer substation incoming line section are regarded as the same conductor; simplifying the equipotential shielding capacitor voltage transformer into a three-phase equivalent model, wherein the three-phase equivalent model comprises the following steps: a GIS sleeve, a grounding switch, an equipotential shielding capacitor voltage transformer, a post insulator and a grading ring model of a lightning arrester;
according to the three-phase equivalent model, performing equivalent circuit modeling on the equipotential shielding capacitor voltage transformer: numbering the flanges of the equipotential shielding capacitor voltage transformer in sequence, and setting the ground as an electrode 0;
according to the equivalent circuit model of the equipotential shielding capacitor type voltage transformer, the relation between the potential of each electrode and the capacitance can be obtained by utilizing the extracted stray capacitance parameters and the capacitance parameters of the capacitive voltage divider, and theoretical basis is provided for further researching the error characteristics and the electrical and structural design of the voltage transformer;
the relationship between each electrode potential and capacitance is as follows:
wherein:
in order to be at the earth potential,
u, V, W, respectively, are phase voltages of three phases,
q4～q21has a charge value of 0; ci,0Is the capacitance to ground of each electrode; ci,jIs the stray capacitance between the electrodes;
converting the distributed capacitance matrix [ C ] into an inductance coefficient matrix [ beta ], and finally obtaining the equipotential shielding capacitor voltage transformer circuit equation considering the stray capacitance, wherein the equation is as follows:
and obtaining a partial capacitance matrix [ C ] or an induction coefficient matrix [ beta ] of the equipotential shielding capacitor voltage transformer, and further calculating a measurement error brought to the equipotential shielding capacitor voltage transformer by the stray capacitance.
2. The method as claimed in claim 1, wherein the voltage transformer comprises equipotential shielding capacitor units having supporting flanges at two ends thereof connected to each other.
3. The method for constructing an equivalent circuit model of an equipotential shielding capacitor voltage transformer according to claim 2, wherein the equipotential shielding capacitor unit comprises a main capacitor, an inner insulating material, a shielding capacitor, a ring electrode and an insulating sleeve, which are coaxially arranged between the supporting flanges in sequence from inside to outside.
4. The method for constructing an equivalent circuit model of an equipotential shielding capacitor voltage transformer according to claim 1, wherein the equipotential shielding capacitor voltage transformer is simplified into the equivalent circuit model.
5. The method for constructing an equivalent circuit model of an equipotential shielding capacitor voltage transformer according to claim 4, wherein the equivalent circuit model comprises: a single equal potential shielded capacitor voltage transformer is equivalent to 7 electrodes.
6. The method for constructing an equivalent circuit model of an equipotential shielding capacitor voltage transformer according to claim 1, wherein the equivalent circuit model is applicable to 1000kV extra-high voltage equipotential shielding capacitor voltage transformers and all other voltage classes and all forms of capacitor voltage transformers.
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| CN201510920397.0A CN106872751B (en) | 2015-12-11 | 2015-12-11 | Equivalent circuit model of equipotential shielding capacitor voltage transformer |
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| WO2020102973A1 (en) * | 2018-11-20 | 2020-05-28 | Abb Schweiz Ag | Apparatus for monitoring temperature and voltage of cable joint of cable connected to gas insulated switchgear, and associated manufacturing method |
| CN113268944A (en) * | 2021-05-21 | 2021-08-17 | 广东电网有限责任公司广州供电局 | Broadband modeling method and system of high-coupling split reactor |
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| CN201804696U (en) * | 2010-05-04 | 2011-04-20 | 中国电力科学研究院 | Ultra-high voltage isoelectric shielding CVT |
| CN102095941A (en) * | 2010-12-15 | 2011-06-15 | 广东电网公司电力科学研究院 | Method for measuring equivalent inductance of coupling capacitance loop under lightning over-voltage and system thereof |
| CN203572859U (en) * | 2013-10-29 | 2014-04-30 | 国家电网公司 | Novel high-voltage impact resistor voltage divider device |
| CN204228796U (en) * | 2014-11-24 | 2015-03-25 | 国家电网公司 | A kind of joint flange of equal potential shielded capacitor voltage transformer |
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Patent Citations (4)
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|---|---|---|---|---|
| CN201804696U (en) * | 2010-05-04 | 2011-04-20 | 中国电力科学研究院 | Ultra-high voltage isoelectric shielding CVT |
| CN102095941A (en) * | 2010-12-15 | 2011-06-15 | 广东电网公司电力科学研究院 | Method for measuring equivalent inductance of coupling capacitance loop under lightning over-voltage and system thereof |
| CN203572859U (en) * | 2013-10-29 | 2014-04-30 | 国家电网公司 | Novel high-voltage impact resistor voltage divider device |
| CN204228796U (en) * | 2014-11-24 | 2015-03-25 | 国家电网公司 | A kind of joint flange of equal potential shielded capacitor voltage transformer |
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