CN109188102A - A method of obtaining the equivalent total capacitance of step down side - Google Patents
A method of obtaining the equivalent total capacitance of step down side Download PDFInfo
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- CN109188102A CN109188102A CN201811140876.0A CN201811140876A CN109188102A CN 109188102 A CN109188102 A CN 109188102A CN 201811140876 A CN201811140876 A CN 201811140876A CN 109188102 A CN109188102 A CN 109188102A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
Abstract
A kind of method obtaining the equivalent total capacitance of step down side proposed by the present invention, the first respectively capacitor C of measurement high-voltage winding and low pressure winding over the groundIt is high and it is low over the ground, low pressure winding is to the capacitor C of high-voltage winding and groundIt is low to high and groundWith high-voltage winding to the capacitor C of low pressure winding and groundHeight to it is low over the ground；Then by CIt is high and it is low over the ground、CIt is low to high and groundAnd CHeight to it is low over the groundComprehensive operation, obtains CHeight is over the ground.The present invention passes through measurement CIt is high and it is low over the ground、CIt is low to high and groundAnd CHeight to it is low over the ground, and combine CIt is high and it is low over the ground、CIt is low to high and groundAnd CHeight to it is low over the groundCalculate CHeight is over the ground, so that for calculating CHeight is over the groundData it is more abundant, be conducive to improve obtain CHeight is over the groundIt is accurate, further according to CHeight is over the groundAnd CIt is low to high and groundCOMPREHENSIVE CALCULATING goes out the equivalent total capacitance of step down side, in transformer partial discharge test, is conducive to improve test effect, so that the calculating of resonance frequency is more careful accurate.
Description
Technical field
The present invention relates to transformer technology field more particularly to a kind of sides for obtaining the equivalent total capacitance of step down side
Method.
Background technique
Before carrying out transformer partial discharge test, by the way that the resonance frequency of test can be calculated, step down side etc. is obtained
Effect capacitor is one of the necessary condition for calculating resonance frequency.Transformer low voltage equivalent capacity is by CIt is low to high and groundAnd CHeight is over the groundTwo parts group
At, but common CHeight is to low and groundInstead of CHeight is over the ground, CIt is low to high and groundIt is low pressure winding to the capacitor of high-voltage winding and ground, CHeight is to low and groundFor high voltage winding
Capacitor of the group to low pressure winding and ground, CHeight is over the groundFor the capacitor of high-voltage winding over the ground.This method obtains CLow-pressure side is equivalentInaccuracy, to change
Depressor local discharge test brings many puzzlements.
Summary of the invention
Technical problems based on background technology, the invention proposes a kind of equivalent total capacitances of acquisition step down side
Method.
A kind of method obtaining the equivalent total capacitance of step down side proposed by the present invention, measures high-voltage winding respectively first
And the capacitor C of low pressure winding over the groundIt is high and it is low over the ground, low pressure winding is to the capacitor C of high-voltage winding and groundIt is low to high and groundWith high-voltage winding to low pressure
The capacitor C of winding and groundHeight to it is low over the ground；Then by CIt is high and it is low over the ground、CIt is low to high and groundAnd CHeight to it is low over the groundComprehensive operation, obtains CHeight is over the ground, then by CHeight is over the groundWith
CIt is low to high and groundComprehensive operation, obtains the equivalent total capacitance C of step down sideLow-pressure side is equivalent。
Preferably, CIt is high and it is low over the groundMeasurement method are as follows: high pressure three-phase windings and low voltage three-phase winding short circuit be followed by dielectric loss
Instrument High voltage output obtains the capacitor C of high-voltage winding and low pressure winding over the ground by dielectric loss instrument measurementIt is high and it is low over the ground；
Preferably, CIt is low to high and groundMeasurement method are as follows: high pressure three-phase windings be shorted ground connection after, low voltage three-phase winding short circuit be followed by
Dielectric loss instrument High voltage output obtains low pressure winding to the capacitor C of high-voltage winding and ground by dielectric loss instrument measurementIt is low to high and ground；
Preferably, CHeight to it is low over the groundMeasurement method are as follows: low voltage three-phase winding be shorted ground connection after, high pressure three-phase windings short circuit be followed by
Dielectric loss instrument High voltage output obtains high-voltage winding to the capacitor C of low pressure winding and ground by dielectric loss instrument measurementHeight to it is low over the ground。
Preferably, by CIt is high and it is low over the ground、CIt is low to high and groundAnd CHeight to it is low over the groundComprehensive operation, obtains CHeight is over the groundCircular are as follows: CHeight is over the ground
=(CIt is high and it is low over the ground+CHeight to it is low over the ground-CIt is low to high and ground)/2。
Preferably, by CHeight is over the groundAnd CIt is low to high and groundComprehensive operation, obtains CLow-pressure side is equivalentCircular are as follows: CLow-pressure side is equivalent=
CIt is low to high and ground+K2CHeight is over the ground, K is the no-load voltage ratio of transformer.
A kind of method obtaining the equivalent total capacitance of step down side proposed by the present invention, by measuring CIt is high and it is low over the ground、
CIt is low to high and groundAnd CHeight to it is low over the ground, in conjunction with CIt is high and it is low over the ground、CIt is low to high and groundAnd CHeight to it is low over the groundCalculate CHeight is over the ground, so that for calculating CHeight is over the groundData more fill
Point, and combine CHeight is over the groundAnd CIt is low to high and groundCalculate CLow-pressure side is equivalent, be conducive to improve acquisition CLow-pressure side is equivalentIt is accurate, transformer partial discharge test
In, be conducive to improve test effect, so that the calculating of resonance frequency is more careful accurate.
In the present invention, difference specific aim connecting test circuit, precise measurement CIt is high and it is low over the ground、CIt is low to high and groundAnd CHeight to it is low over the ground, so that with
In calculating CHeight is over the groundData it is accurate, so that further increasing calculating takes CLow-pressure side is equivalentOrder of accuarcy.
Detailed description of the invention
Fig. 1 is CIt is high and it is low over the groundMeasure equivalent circuit；
Fig. 2 is CIt is low to high and groundMeasure equivalent circuit；
Fig. 3 is CHeight to it is low over the groundMeasure equivalent circuit；
Fig. 4 is a kind of flow chart of method for obtaining the equivalent total capacitance of step down side proposed by the present invention.
Specific embodiment
Referring to Fig.1, a kind of method obtaining the equivalent total capacitance of step down side proposed by the present invention, measures respectively first
The capacitor C of high-voltage winding and low pressure winding over the groundIt is high and it is low over the ground, low pressure winding is to the capacitor C of high-voltage winding and groundIt is low to high and groundAnd high voltage winding
Capacitor C of the group to low pressure winding and groundHeight to it is low over the ground；Then by CIt is high and it is low over the ground、CIt is low to high and groundAnd CHeight to it is low over the groundComprehensive operation, obtains CHeight is over the ground, then
By CHeight is over the groundAnd CIt is low to high and groundComprehensive operation, obtains the equivalent total capacitance C of step down sideLow-pressure side is equivalent。
In this way, in present embodiment, by measuring CIt is high and it is low over the ground、CIt is low to high and groundAnd CHeight to it is low over the ground, so that for calculating CHeight is over the groundNumber
According to the C for more sufficiently, being conducive to improve acquisitionHeight is over the groundIt is accurate, transformer partial discharge test in, be conducive to improve test effect,
So that the calculating of resonance frequency is more careful accurate.
Specifically, in present embodiment, by CIt is high and it is low over the ground、CIt is low to high and groundAnd CHeight to it is low over the groundComprehensive operation, obtains CHeight is over the groundSpecific meter
Calculation method are as follows: CHeight is over the ground=(CIt is high and it is low over the ground+CHeight to it is low over the ground-CIt is low to high and ground)/2。
Specifically, in present embodiment, by CHeight is over the groundAnd CIt is low to high and groundComprehensive operation, obtains CLow-pressure side is equivalentCircular
Are as follows: CLow-pressure side is equivalent=CIt is low to high and ground+K2CHeight is over the ground, K is the no-load voltage ratio of transformer.
In further embodiment of the present invention, CIt is high and it is low over the groundMeasurement method are as follows: high pressure three-phase windings and low voltage three-phase winding
Short circuit is followed by dielectric loss instrument High voltage output, obtains the capacitor of high-voltage winding and low pressure winding over the ground by dielectric loss instrument measurement
CIt is high and it is low over the ground.Specifically, the connection of high pressure three-phase windings, low voltage three-phase winding and dielectric loss instrument measures C in this stepIt is high and it is low over the ground
Equivalent circuit it is as shown in Figure 1.
In further embodiment of the present invention, CIt is low to high and groundMeasurement method are as follows: high pressure three-phase windings be shorted ground connection after, low pressure
Three-phase windings short circuit is followed by dielectric loss instrument High voltage output, obtains low pressure winding to high-voltage winding and ground by dielectric loss instrument measurement
Capacitor CIt is low to high and ground.Specifically, the connection of high pressure three-phase windings, low voltage three-phase winding and dielectric loss instrument measures in this step
CIt is low to high and groundEquivalent circuit it is as shown in Figure 2.
In further embodiment of the present invention, CHeight to it is low over the groundMeasurement method are as follows: low voltage three-phase winding be shorted ground connection after, high pressure
Three-phase windings short circuit is followed by dielectric loss instrument High voltage output, obtains high-voltage winding to low pressure winding and ground by dielectric loss instrument measurement
Capacitor CHeight to it is low over the ground.Specifically, the connection of high pressure three-phase windings, low voltage three-phase winding and dielectric loss instrument measures in this step
CHeight to it is low over the groundEquivalent circuit it is as shown in Figure 3.
In present embodiment, in conjunction with above step, difference specific aim connecting test circuit, precise measurement CIt is high and it is low over the ground、
CIt is low to high and groundAnd CHeight to it is low over the ground, so that for calculating CHeight is over the groundData it is accurate, thus further increase calculate CHeight is over the groundOrder of accuarcy.
The above, preferable specific embodiment only of the present invention, but protection scope of the present invention not office
Be limited to this, anyone skilled in the art in the technical scope disclosed by the present invention, technology according to the present invention
Scheme and its inventive concept are subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (6)
1. it is a kind of obtain the equivalent total capacitance of step down side method, which is characterized in that first respectively measure high-voltage winding and
The capacitor C of low pressure winding over the groundIt is high and it is low over the ground, low pressure winding is to the capacitor C of high-voltage winding and groundIt is low to high and groundWith high-voltage winding to low pressure around
The capacitor C of group and groundHeight to it is low over the ground；Then by CIt is high and it is low over the ground、CIt is low to high and groundAnd CHeight to it is low over the groundComprehensive operation, obtains CHeight is over the ground, then by CHeight is over the groundWith
CIt is low to high and groundComprehensive operation, obtains the equivalent total capacitance C of step down sideLow-pressure side is equivalent。
2. obtaining the method for the equivalent total capacitance of step down side as described in claim 1, which is characterized in that CIt is high and it is low over the groundSurvey
Amount method are as follows: high pressure three-phase windings and low voltage three-phase winding short circuit are followed by dielectric loss instrument High voltage output, are measured by dielectric loss instrument
Obtain the capacitor C of high-voltage winding and low pressure winding over the groundIt is high and it is low over the ground。
3. obtaining the method for the equivalent total capacitance of step down side as described in claim 1, which is characterized in that CIt is low to high and groundSurvey
Amount method are as follows: after high pressure three-phase windings are shorted ground connection, low voltage three-phase winding short circuit is followed by dielectric loss instrument High voltage output, passes through Jie
Damage instrument measurement obtains low pressure winding to the capacitor C of high-voltage winding and groundIt is low to high and ground。
4. obtaining the method for the equivalent total capacitance of step down side as described in claim 1, which is characterized in that CHeight to it is low over the groundSurvey
Amount method are as follows: after low voltage three-phase winding is shorted ground connection, high pressure three-phase windings short circuit is followed by dielectric loss instrument High voltage output, passes through Jie
Damage instrument measurement obtains high-voltage winding to the capacitor C of low pressure winding and groundHeight to it is low over the ground。
5. obtaining the method for the equivalent total capacitance of step down side as described in claim 1, which is characterized in that by CIt is high and it is low over the ground、
CIt is low to high and groundAnd CHeight to it is low over the groundComprehensive operation, obtains CHeight is over the groundCircular are as follows: CHeight is over the ground=(CIt is high and it is low over the ground+CHeight to it is low over the ground-CIt is low to high and ground)/
2。
6. according to the method for described in any item equivalent total capacitances of acquisition step down side of right 1 to 5, which is characterized in that
By CHeight is over the groundAnd CIt is low to high and groundComprehensive operation, obtains CLow-pressure side is equivalentCircular are as follows: CLow-pressure side is equivalent=CIt is low to high and ground+K2CHeight is over the ground, K is to become
The no-load voltage ratio of depressor.
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| CN201811140876.0A CN109188102A (en) | 2018-09-28 | 2018-09-28 | A method of obtaining the equivalent total capacitance of step down side |
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| CN201811140876.0A CN109188102A (en) | 2018-09-28 | 2018-09-28 | A method of obtaining the equivalent total capacitance of step down side |
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Citations (4)
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| US20130002048A1 (en) * | 2011-06-28 | 2013-01-03 | Murata Manufacturing Co., Ltd. | High-frequency power device, power transmission device, and power transfer system |
| CN106154055A (en) * | 2016-08-20 | 2016-11-23 | 福州大学 | A kind of transformer bay noise equivalent capacitance measurement method and equipment altogether |
| CN107255752A (en) * | 2017-04-24 | 2017-10-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of computational methods of converter power transformer entrance capacitance |
| CN108303607A (en) * | 2018-01-09 | 2018-07-20 | 广东电网有限责任公司电力科学研究院 | A kind of transformer combination operation capacitance matching detection method and system |
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2018
- 2018-09-28 CN CN201811140876.0A patent/CN109188102A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130002048A1 (en) * | 2011-06-28 | 2013-01-03 | Murata Manufacturing Co., Ltd. | High-frequency power device, power transmission device, and power transfer system |
| CN106154055A (en) * | 2016-08-20 | 2016-11-23 | 福州大学 | A kind of transformer bay noise equivalent capacitance measurement method and equipment altogether |
| CN107255752A (en) * | 2017-04-24 | 2017-10-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of computational methods of converter power transformer entrance capacitance |
| CN108303607A (en) * | 2018-01-09 | 2018-07-20 | 广东电网有限责任公司电力科学研究院 | A kind of transformer combination operation capacitance matching detection method and system |
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| 唐山供电局修试所联合试验组 等: "三相电力变压器的操作波试验", 《清华大学学报（自然科学版）》 * |
| 张昭南 等: "变压器入口等效电容引起的三相对地电压不平衡的分析及处理", 《广西电力》 * |
| 彭平 等: "铁芯不接地对变压器绕组介质损耗因素和电容量测量的影响", 《湖南电力》 * |
| 赵胤 等: "一起变压器低压绕组介损及电容量异常分析", 《江苏电机工程》 * |
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Application publication date: 20190111 |