CN106872751A - A kind of equivalent-circuit model of equal potential shielded capacitor voltage transformer - Google Patents
A kind of equivalent-circuit model of equal potential shielded capacitor voltage transformer Download PDFInfo
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- CN106872751A CN106872751A CN201510920397.0A CN201510920397A CN106872751A CN 106872751 A CN106872751 A CN 106872751A CN 201510920397 A CN201510920397 A CN 201510920397A CN 106872751 A CN106872751 A CN 106872751A
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- voltage transformer
- equivalent
- capacitor voltage
- equal potential
- shielded capacitor
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transformers For Measuring Instruments (AREA)
- Regulation Of General Use Transformers (AREA)
Abstract
The invention provides a kind of equivalent-circuit model of equal potential shielded capacitor voltage transformer, including：The capacitive divider of the equal potential shielded capacitor voltage transformer is represented with the flange of each capacitor unit for constituting the divider；Electrical body around the equal potential shielded capacitor voltage transformer is represented with each electrical body top grading ring；Regard all electrical body grading rings in the transforming plant lead-in same circuitry phase of section as same conductor；Determine electrical body sum and the number consecutively in the equivalent-circuit model, and numbered as an entirety using flange therein and with its equipotential grading ring.The present invention lays the first stone for the additive error of capacitance type potential transformer under the influence of further Accurate Analysis stray parameter；Stray parameter network Rational Simplification numerous and diverse under substation field operating mode is enhanced the operability of stray parameter extraction by the present invention, improves the efficiency of stray parameter extraction, while ensureing the high accuracy for calculating.
Description
Technical field
The present invention relates to a kind of power system transformer device, in particular to a kind of equal potential shielded capacitor electricity
Pressure transformer.
Background technology
Capacitance type potential transformer (equal potential shielded capacitor voltage transformer) due to dielectric strength it is high,
Can reduce lightning impulse wave head steepness, will not with system occur ferromagnetic resonance, low cost and can double as couple electricity
The advantages of container is used for power line carrier communication, is widely used in field of power, and voltage range has been covered
35kV~1000kV, more than 90% is reached in 110kV and above voltage levels occupation rate of market.With electricity
The development of power marketing, to the measuring requirement more and more higher of electric energy, develops high-precision capacitor voltage mutual inductance
Device is into certainty.
Influenceing the factor of the equal potential shielded capacitor voltage transformer degree of accuracy has a lot, including electromagnetic unit is missed
The additive error that difference, capacitive divider error and frequency, temperature, kindred effect cause.Wherein, neighbouring effect
The additive error that should be brought is due to around grounding body or electrical body and equal potential shielded capacitor voltage transformer
Between there is stray capacitance, cause the actual intrinsic standoff ratio of capacitive divider with satisfactory voltage division than deviateing, so that accurate
Exactness reduction.And increasing with voltage class, the additive error increase that stray capacitance causes, there is document to point out,
During 1000kV equal potential shielded capacitor voltage transformer actual motions, the additive error that kindred effect is brought reaches
0.3% or so, the influence to equivalent potential screen accuracy of capacitor voltage transformer is non-negligible.Therefore analyze miscellaneous
Influence of the spurious capacitance to equivalent potential screen accuracy of capacitor voltage transformer is to developing high accuracy equivalent potential screen
Capacitance type potential transformer is significant.
However, the existing additive error caused to stray capacitance only some test methods or approximate theoretical meter
Calculate, not yet systematic method is studied.The present invention is with equal potential shielded capacitor voltage transformer in power transformation
The stray capacitance produced in environment of standing is research object, it is proposed that a kind of equal potential shielded capacitor voltage transformer
Equivalent-circuit model, the equivalent-circuit model can be conveniently used for calculating equal potential shielded capacitor voltage transformer and exist
Stray capacitance in substation field environment, is further to calculate equal potential shielded capacitor voltage transformer reality
Intrinsic standoff ratio, draws the premise bar of the additive error that stray capacitance is produced to equal potential shielded capacitor voltage transformer
Part, and then for the design and optimization of equal potential shielded capacitor voltage transformer electric parameter provides guidance.
The content of the invention
Regarding to the issue above, the invention provides a kind of equivalent circuit of equal potential shielded capacitor voltage transformer
Model, it is existing in transformer station that the equivalent-circuit model can be conveniently used for calculating equal potential shielded capacitor voltage transformer
Stray capacitance in the environment of field, is further to calculate the actual intrinsic standoff ratio of equal potential shielded capacitor voltage transformer,
The precondition of the additive error that stray capacitance is produced to equal potential shielded capacitor voltage transformer is drawn, and then
It is auxiliary higher precision, higher for the design of equal potential shielded capacitor voltage transformer electric parameter provides guidance
The research and design of voltage class equal potential shielded capacitor voltage transformer.
A kind of equivalent-circuit model of equal potential shielded capacitor voltage transformer, it is characterised in that including：
By the capacitive divider of the equal potential shielded capacitor voltage transformer each electricity for constituting the divider
The flange of container unit is represented；
Electrical body each electrical body top grading ring table around the equal potential shielded capacitor voltage transformer
Show；
Regard all electrical body grading rings in the transforming plant lead-in same circuitry phase of section as same conductor；
Determine in the equivalent-circuit model electrical body sum and number consecutively, and by flange therein and and its
Equipotential grading ring is numbered as an entirety.
Wherein, the voltage transformer is provided with the equivalent potential screen capacitor of pivot flange interconnection including two ends
Unit.
Wherein, the equivalent potential screen capacitor unit includes being arranged between the pivot flange, from inside to outside
Main capacitor, interior insulation material, screened condenser, annular electrode and the insulating sleeve for sequentially coaxially setting.
Wherein, it is characterised in that the equal potential shielded capacitor voltage transformer is reduced to three equivalent moulds
Type.
Wherein, it is characterised in that the equivalent-circuit model includes single-phase equal potential shielded capacitor voltage is mutual
Sensor is equivalent to 7 electrodes.
Wherein, it is characterised in that described equivalent-circuit model is used for the extra-high-voltage equal potential shielded electricity of 1000kV
Appearance formula voltage transformer and all voltage class, the capacitance type potential transformer of form of ownership.
Compared with prior art, the invention has the advantages that：
1st, the present invention proposes a kind of for calculating equal potential shielded capacitor voltage mutual inductance under the influence of stray parameter
The equivalent model of device additive error.For quantitative calculating equal potential shielded capacitor voltage transformer stray parameter is provided
One effective way, and under the influence of further Accurate Analysis stray parameter capacitance type potential transformer it is additional
Error lays the first stone.
2nd, the equivalent model is simple and clear, and stray parameter network numerous and diverse under substation field operating mode is rationally simple
Change, avoided cumbersome stray parameter calculating process, enhance the operability of stray parameter extraction, improve
The efficiency that stray parameter is extracted, while ensureing the high accuracy for calculating.
Brief description of the drawings
Fig. 1 is equal potential shielded capacitor voltage transformer conductor label schematic diagram；
Fig. 2 is the capacitor unit generalized section of equal potential shielded capacitor voltage transformer；
Fig. 3 enters line segment electrical equipment arrangement schematic diagram for southeast Shanxi 1000kV ultra-high voltage transformer stations；
Fig. 4 enters line segment three-phase equivalent model schematic diagram for southeast Shanxi 1000kV ultra-high voltage transformer stations；
Fig. 5 is equal potential shielded capacitor voltage transformer circuit model schematic；
Wherein, 1- compound inslations sleeve flange；2- main capacitors；3- insulating materials；4- compound inslation sleeves；
5- screened condensers；6-GIS sleeve pipe grading rings；7- earthed switch grading rings；8- equal potential shielded capacitors electricity
Pressure transformer grading ring；9- support insulator grading rings；10- arrester grading rings.
Specific embodiment
Equivalent potential screen equal potential shielded capacitor voltage transformer equivalent model is set up with reference to Fig. 1-5 pairs
Method is described in detail：
Step 1：Power transformation is set up according to southeast Shanxi 1000kV extra-high-voltage alternating current Substation Electric Equipment practical layouts
Stand mutual into line segment three-phase equivalent model, including GIS sleeve pipes, earthed switch, equal potential shielded capacitor voltage
The grading ring model of sensor, support insulator and arrester.It is adjacent mutually electric with the electriferous state reflection of each grading ring
The electriferous state of equipment, each electricity is represented with the electric capacity between each grading ring and equal potential shielded capacitor voltage transformer
Stray capacitance between gas equipment and equal potential shielded capacitor voltage transformer, and itself and Equipotential shield are calculated with this
Cover the stray capacitance produced between capacitance type potential transformer.
Step 2：The transformer station's three-phase equivalent model set up according to step 1, sets up equivalent potential screen electricity
Equivalent-circuit model of the appearance formula voltage transformer under stray capacitance influences.By three-phase equal potential shielded capacitor electricity
Press the flange of transformer to number in order, and make the earth for electrode 0, it is mutual per equal potentials shielded capacitor voltage
Sensor model can be reduced to 7 electrodes, have 21 electrodes.With the equal potential shielded capacitor voltage of V
As a example by transformer model, electrode 2 represents V equal potentials shielded capacitor voltage transformer top flanges and change
The grading ring of the line segment all electrical bodies of V phases is entered in power station；Between black electrodes 19,20,21 represent main capacitor
Flange；White electrode 10,11,12 represents the flange between screened condenser, main capacitor and screened condenser
Between without electrical connection.Then the stray capacitance of V equal potentials shielded capacitor voltage transformer model can lead to
This 7 nodes are crossed to express.Circuit model schematic is shown in Fig. 5, miscellaneous using what is extracted according to above-mentioned model
Spurious capacitance parameter and capacitive divider capacitance parameter in itself, can obtain the pass between each node potential and electric capacity
It is formula such as formula (2-1).
Wherein：It is ground potential,Respectively U, V, W three-phase phase voltage, q4~q21Charge value be 0；Ci,0It is the direct-to-ground capacitance of each electrode；Ci,jFor between electrode
Stray capacitance.
Distributed capacitance matrix [C] is converted into induction coefficient matrix [β], after the consideration stray capacitance for finally giving
Equal potential shielded capacitor voltage transformer circuit equation such as formula (2-2).
As long as obtaining the Partial capacitance matrix [C] or induction coefficient square of equal potential shielded capacitor voltage transformer
Battle array [β], it is possible to further push over and try to achieve what stray capacitance was brought to equal potential shielded capacitor voltage transformer
Measurement error.
Finally it should be noted that:The above embodiments are merely illustrative of the technical solutions of the present invention rather than it is limited
System, although being described in detail to the present invention with reference to above-described embodiment, those of ordinary skill in the art should
Work as understanding：Specific embodiment of the invention can still be modified or equivalent, and without departing from this
Any modification of spirit and scope or equivalent, it all should cover in the middle of present claims scope.
Claims (6)
1. a kind of equivalent-circuit model of equal potential shielded capacitor voltage transformer, it is characterised in that including：
By the capacitive divider of the equal potential shielded capacitor voltage transformer each electricity for constituting the divider
The flange of container unit is represented；
Electrical body each electrical body top grading ring table around the equal potential shielded capacitor voltage transformer
Show；
Regard all electrical body grading rings in the transforming plant lead-in same circuitry phase of section as same conductor；
Determine in the equivalent-circuit model electrical body sum and number consecutively, and by flange therein and and its
Equipotential grading ring is numbered as an entirety.
2. a kind of equal potential shielded capacitor voltage transformer as claimed in claim 1, it is characterised in that
The voltage transformer is provided with the equivalent potential screen capacitor unit of pivot flange interconnection including two ends.
3. a kind of equal potential shielded capacitor voltage transformer as claimed in claim 2, it is characterised in that
The equivalent potential screen capacitor unit include being arranged on it is between the pivot flange, sequentially coaxially set from inside to outside
Main capacitor, interior insulation material, screened condenser, annular electrode and the insulating sleeve put.
4. a kind of equivalent-circuit model of equal potential shielded capacitor voltage transformer as claimed in claim 1,
Characterized in that, the equal potential shielded capacitor voltage transformer is reduced into three-phase equivalent model.
5. a kind of equivalent-circuit model of equal potential shielded capacitor voltage transformer as claimed in claim 4,
Characterized in that, the equivalent-circuit model includes being equivalent to single-phase equal potential shielded capacitor voltage transformer
7 electrodes.
6. a kind of equivalent-circuit model of equal potential shielded capacitor voltage transformer as claimed in claim 1,
Characterized in that, described equivalent-circuit model is mutual for 1000kV extra-high-voltage equal potential shielded capacitor voltages
Sensor and all voltage class, the capacitance type potential transformer of form of ownership.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510920397.0A CN106872751B (en) | 2015-12-11 | 2015-12-11 | Equivalent circuit model of equipotential shielding capacitor voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510920397.0A CN106872751B (en) | 2015-12-11 | 2015-12-11 | Equivalent circuit model of equipotential shielding capacitor voltage transformer |
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| Publication Number | Publication Date |
|---|---|
| CN106872751A true CN106872751A (en) | 2017-06-20 |
| CN106872751B CN106872751B (en) | 2020-11-03 |
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| CN201510920397.0A Active CN106872751B (en) | 2015-12-11 | 2015-12-11 | Equivalent circuit model of equipotential shielding capacitor voltage transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112449677A (en) * | 2018-11-20 | 2021-03-05 | Abb瑞士股份有限公司 | Device for monitoring the temperature and voltage of a cable joint of a cable connected to a 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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2015
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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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|---|---|---|---|---|
| CN112449677A (en) * | 2018-11-20 | 2021-03-05 | Abb瑞士股份有限公司 | Device for monitoring the temperature and voltage of a cable joint of a cable connected to a 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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| CN106872751B (en) | 2020-11-03 |
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