CN105116201B - The measuring device and measuring method of return voltage parameter - Google Patents
The measuring device and measuring method of return voltage parameter Download PDFInfo
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- CN105116201B CN105116201B CN201510638677.2A CN201510638677A CN105116201B CN 105116201 B CN105116201 B CN 105116201B CN 201510638677 A CN201510638677 A CN 201510638677A CN 105116201 B CN105116201 B CN 105116201B
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Abstract
The invention discloses a kind of measuring devices of return voltage parameter, including a capacitor, the top crown of capacitor is equipped with upper terminals, bottom crown is equipped with lower terminals, is connected in series with a Micrometer of current on lower terminals, the output interface of Micrometer of current is connected with a data collecting card；Capacitor is placed in a sealing container, and upper terminals, lower terminals reach outside sealing container, and sealing container is connected with a vacuum extractor.Compared with prior art, inventive article has the following advantages：1) the assessment parameter that return voltage is directly obtained by measuring the charging and discharging currents on capacitor plate avoids influence of the leakage current to voltage measurement, while more convenient, accurate by the assessment parameter that electric current obtains；2) shell of measuring device is increased the creepage distance of surface leakage current, is reduced error caused by leakage current using the concave-convex clothing pleat design of height；3) it is in vacuum state inside measuring device, the influence that the factors such as humidity are brought in air can be eliminated.
Description
Technical field
The present invention relates to a kind of measuring devices of return voltage parameter.The measuring device is used the invention further relates to a kind of
The method for carrying out return voltage parameter measurement.
Background technology
In modern power systems, electric energy safe with good supply is reliably most basic requirement.In electric system, become
Depressor is the key equipment of entire electrical grid transmission electric energy and distribution electric energy.Therefore, transformer it is good whether directly influence it is whole
Reliable, the stable operation of a electric system.Transformer insulated partial properties decline, and special interior insulation deterioration damage can directly be led
Cause Power Transformer Faults.Up to now, the monitoring method of transformer insulation state can be divided mainly into chemical method, method for electrically and
Other diagnostic methods.Wherein chemical method include furfural content analysis in insulation paper polymerization degree test, oil, water trace analysis, it is oily in
Dissolved gas analysis etc., method for electrically include dielectric response method (time domain, frequency domain) and traditional electric test method.
Return voltage method (Return voltage method, RVM) based on dielectric response basis started from for 20th century 90 years
Generation is a kind of nondestructive testing method obtaining Solid Insulation of Power Transformer state by applied voltage.Its advantage is that anti-
Interference performance is strong, the initial slope S of return voltage curvei, centre time constant tdomEtc. parameters and transformer aging journey
Moisture etc. is closely related in degree, paper；It can also be advantageously used in the field monitoring of transformer simultaneously.It is exhausted recently as transformer
Development of the edge state-detection in terms of lossless state of insulation testing research, return voltage method are gradually taken seriously.
The test method of return voltage is directly to access voltage test device, but the party at tested object both ends at present
Method is when carrying out return voltage test：When in the both ends parallel connection of test object test branch equivalent inpnt resistance, etc.
The insulation resistance that input resistance is often much smaller than tested object itself is imitated, therefore the access of equivalent inpnt resistance to generate back
The free charge of complex voltage has new leak path, accelerates the leakage rate of free charge so that the return voltage of acquisition
Curve has prodigious error, and obtained status assessment data is inaccurate；Second is that in data processing, voltage test device connects
The continuous sample that measures obtains return voltage numerical value, then obtains return voltage curve by being fitted its numerical value, finally to return voltage song
Line carries out numerical analysis and obtains assessment parameter, and asking for the data precision decline is also will appear during process is relatively complicated and fit procedure
Topic.
Invention content
First technical problem to be solved by this invention is just to provide a kind of measuring device of return voltage parameter.
Second technical problem to be solved by this invention is just to provide a kind of measurement method of return voltage parameter.
Device and method using the present invention can directly obtain the return voltage ginseng of assessment transformer oil paper insulation state
Number, the defect of error is caused so as to avoid existing return voltage test equipment Leakage Current, improves the accuracy rate of measurement, together
When simplify cumbersome assessment parameter calculation procedure so that measure it is more convenient.
Above-mentioned first technical problem is solved, the present invention adopts the following technical scheme that：
A kind of measuring device of return voltage parameter, it is characterized in that：Including a capacitor, the top crown of the capacitor is set
There are upper terminals, bottom crown to be equipped with lower terminals, a Micrometer of current is connected in series on the lower terminals, it is described
The output interface of Micrometer of current is connected with a data collecting card；The capacitor is placed in a sealing container, described
Upper terminals, lower terminals reach outside sealing container, the sealing container is connected with a vacuum extractor..
Further, the capacitor is plane-parallel capacitor, and the upper terminals are upper metal guide rod, described
Lower terminals are lower metal guide rod, and the upper metal guide rod is equipped with external screw thread, one and upper gold are provided in the sealing container
Belong to the threaded hole of guide rod cooperation, the upper metal guide rod passes through threaded hole stretching sealing container outer and can be by the upper metal of rotation
Guide rod adjusts the distance between capacitor two-plate, and lower metal guide rod fixation is located in sealing container and stretches out sealing
Outside container.
As a kind of embodiment of the present invention, the wall of the sealing container is the plaited skirt shape of bumps.
The sealing container is fabricated by high resistivity insulating materials (SMC plates).
The vacuum means are set to vacuum pump, are arranged on the wall of sealing container.
The plane-parallel capacitor is fabricated by red copper material.
Above-mentioned second technical problem is solved, the present invention adopts the following technical scheme that：
A kind of measurement method of return voltage parameter, it is characterized in that including the following steps：
DC power supply is connected by S1 with the positive and negative terminals of transformer high-low-voltage winding, using DC power supply to transformer
The insulation resistance Rg and geometric capacitance Cg of high-low pressure winding charge, charging time Tc；
S2 disconnects DC power supply, the positive and negative terminals of transformer high-low-voltage winding is connected directly, transformer high-low-voltage
The geometric capacitance Cg of winding discharges, discharge time Td；
S3 disconnects the positive and negative terminals of transformer high-low-voltage winding, by the upper terminals and transformer of the measuring device
The positive terminals of high-low pressure winding are connected, lower terminals are connected with the negative terminals of transformer high-low-voltage winding, by micro-
Current tester obtains the electric current i on capacitor plateC, data collecting card is used in combination to collect the electric current number that Micrometer of current obtains
According to.
Compared with prior art, inventive article has the following advantages：
1) the assessment parameter that return voltage is directly obtained by measuring the charging and discharging currents on capacitor plate avoids leakage electricity
The influence to voltage measurement is flowed, while more convenient, accurate by the assessment parameter that electric current obtains；
2) shell of measuring device increases the creepage distance of surface leakage current using the concave-convex clothing pleat design of height,
Reduce error caused by leakage current；
3) it is in vacuum state inside measuring device, the influence that the factors such as humidity are brought in air can be eliminated.
Description of the drawings
Fig. 1 is the schematic diagram of measuring device of the present invention；
Fig. 2 uses schematic diagram for measuring device of the present invention；
Fig. 3 is the return voltage curve graph that the present invention measures.
In figure：1- sealing containers, 2- vacuum pumps, 3- top crowns, 4- bottom crowns, 5- threaded holes, the upper metal guide rods of 6-,
Metal guide rod under 7-, 8- Micrometer of current, 9- data collecting cards, 10- capacitors.
Specific implementation mode
Using embodiment below in conjunction with the accompanying drawings, the invention will be further described.
As shown in Figure 1, 2, the measuring device embodiment of return voltage parameter of the invention, including a capacitor 10, capacitance
Device 10 is placed in a sealing container 1, and sealing container 1 is connected with a vacuum extractor, and wherein vacuum means are set to vacuum suction
Pump 2, is arranged on the wall of sealing container 1, capacitor 10, which is in the working environment of vacuum, can eliminate humidity in air
Etc. the influence that brings of factors；
The top crown 3 of capacitor 10 is equipped with upper terminals, bottom crown 4 is equipped with lower terminals, is connected in series on lower terminals
There are a Micrometer of current 8, the output interface of Micrometer of current 8 to be connected with a data collecting card 9, by measuring capacitance pole
Charging and discharging currents on plate directly obtain the assessment parameter of return voltage, avoid influence of the leakage current to voltage measurement, simultaneously
The assessment parameter obtained by electric current is more convenient, accurate；
The wall of sealing container 2 is the plaited skirt shape of bumps, is fabricated by high resistivity insulating materials (SMC plates), is surveyed
The shell of device is measured using the concave-convex clothing pleat design of height, the creepage distance of surface leakage current is increased, reduces leakage electricity
Error caused by stream.
Wherein capacitor 10 is plane-parallel capacitor, is fabricated by red copper material, and upper terminals are upper metal guide rod
6, lower terminals are lower metal guide rod 7, and upper metal guide rod 6 is equipped with external screw thread, and be provided with one in sealing container 1 matches with upper metal guide rod
The threaded hole 5 of conjunction, upper metal guide rod 6 are stretched out outside sealing container 1 and can be adjusted by the upper metal guide rod of rotation across threaded hole 5
The distance between capacitor two-plate, the lower fixation of metal guide rod 7 are located in sealing container 1 and stretch out outside sealing container.
As shown in Fig. 2, the specific step of the measurement method of return voltage parameter is carried out to transformer using above-mentioned measuring device
It is rapid as follows：DC power supply is connected with the positive and negative terminals of transformer high-low-voltage winding, utilizes direct current by closure switch J1 first
Power supply charges to the insulation resistance Rg and geometric capacitance Cg of transformer high-low-voltage winding, charging time Tc；Disconnect switch
The positive and negative terminals of transformer high-low-voltage winding are connected directly, the geometry of transformer high-low-voltage winding by J1, closure switch J2
Capacitance Cg discharges, discharge time Td；Disconnect switch J2, closure switch J3, by the upper terminals of the measuring device and
The positive terminals of transformer high-low-voltage winding are connected, lower terminals are connected with the negative terminals of transformer high-low-voltage winding,
The upper and lower pole plate spacing d of the capacitor of the measuring device of the present invention is adjusted by the upper metal guide rod of rotation so that meet with ShiShimonoseki
System
In formula, S is the area of vacuum capacitance pole plate, and d is the distance between upper and lower capacitor plate, and ρ is upper and lower capacitance pole
Resistivity between plate, dielectric constants of the ε between capacitor plate；
The data collecting card of the measuring device of the present invention is connect with terminal, at this moment passes through Micrometer of current
Obtain the electric current i on capacitor plateC.The data that Micrometer of current obtains are sent to calculating finally by data collecting card
Machine terminal is analyzed.
Charging and discharging currents by measuring capacitor obtain the parameter of assessment transformer oil paper insulation state, we can lead to
Cross the relationship that following formula is derived by return voltage test assessment parameter and charging and discharging currents.First, capacitance voltage and capacitance
The relationship of electric current is as follows,
According to the decision formula of capacitanceAnd formula (3) is carried it into, it obtains
According to related mathematical knowledge it is found that capacitance voltage initial value u (0) only determines uC(t) upper and lower translation variation, and use
In the major parameter of transformer oil paper insulation status assessment be the initial slope S of return voltageiWith centre time constant tdom(when
When return voltage has multiple extreme points, the return voltage maximum of points corresponding time is known as main time constant), the above parameter with
Capacitance voltage initial value u (0) is unrelated.To return voltage ure(t) curve is
See Fig. 3, initial slope SiIt is the initial slope of measuring phases, therefore
To,
It should be noted that the t=0 moment in formula (7) refers to that return voltage detects T in Fig. 3pStage (charge and discharge rank
Section after) initial time, that is, J3 be closed moment.Work as ure(t)=UmaxWhen, corresponding derivative value is at this maximum point
0, to
That is iC(tdomWhen)=0, as centre time constant at the time of corresponding.It, can be by t using inverse functiondomIt represents
Come, i.e.,In practical operation, according to data collecting card record return voltage test phase current data,
In the electric current that Micrometer of current is detected for the first time from just becoming the negative stage, at the time of corresponding when electric current registration is 0
As centre time constant tdom。
Meanwhile we can also obtain the maximum return voltage U of return voltage curvemax, it is electric which also can be used as reply
The supplementary parameter of pressure test assessment state of insulation.For UmaxAccording to formula (5), can obtain,
Wherein, tdomThe data that can be obtained by data collecting card are read.
Claims (2)
1. a kind of measuring device of return voltage parameter, it is characterized in that：Including a capacitor（10）, the capacitor（10）It is upper
Pole plate（3）Equipped with upper terminals, bottom crown（4）Equipped with lower terminals, a micro-current is connected in series on the lower terminals
Tester（8）, the Micrometer of current（8）Output interface and a data collecting card（9）It is connected；The capacitor
（10）It is placed in a sealing container（1）Interior, the upper terminals, lower terminals reach sealing container（1）Outside, the sealing
Container（1）It is connected with a vacuum extractor；
The capacitor（10）For plane-parallel capacitor, the upper terminals are upper metal guide rod（6）, the lower wiring
End is lower metal guide rod（7）, the upper metal guide rod（6）Equipped with external screw thread, the sealing container（1）On be provided with one with it is upper
Metal guide rod（6）The threaded hole of cooperation（5）, the upper metal guide rod（6）Across threaded hole（5）Stretch out sealing container（1）Outside
And the upper metal guide rod of rotation can be passed through（6）To adjust capacitor（10）The distance between two-plate, the lower metal guide rod（7）
Fixation is located at sealing container（1）It goes up and stretches out outside sealing container；
The sealing container（1）Wall be concave-convex plaited skirt shape；
The sealing container（10）It is fabricated by high resistivity insulating materials；
The vacuum means are set to vacuum pump（2）, it is arranged in sealing container（1）Wall on；
The plane-parallel capacitor is fabricated by red copper material.
2. a kind of measuring device of return voltage parameter according to claim 1 carries out the side of return voltage parameter measurement
Method, it is characterized in that including the following steps：
DC power supply is connected by S1 with the positive and negative terminals of transformer high-low-voltage winding, and transformer height is given using DC power supply
The insulation resistance Rg and geometric capacitance Cg of low pressure winding charge, charging time Tc；
S2 disconnects DC power supply, the positive and negative terminals of transformer high-low-voltage winding is connected directly, transformer high-low-voltage winding
Geometric capacitance Cg discharge, discharge time Td；
S3 disconnects the positive and negative terminals of transformer high-low-voltage winding, and the upper terminals of the measuring device and transformer are high
The positive terminals of low pressure winding are connected, lower terminals are connected with the negative terminals of transformer high-low-voltage winding, pass through micro- electricity
Current test instrument obtains the electric current i on capacitor plateC, data collecting card is used in combination to collect the electric current number that Micrometer of current obtains
According to.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106226669A (en) * | 2016-09-18 | 2016-12-14 | 国网江苏省电力公司电力科学研究院 | A kind of GIS combined-voltage Combined Trials System and method for |
| CN110542815A (en) * | 2019-09-11 | 2019-12-06 | 厦门理工学院 | method for drawing reply voltage initial slope spectral line, terminal device and storage medium |
| CN110542816A (en) * | 2019-09-11 | 2019-12-06 | 厦门理工学院 | method for drawing return voltage polarization spectrum, terminal device and storage medium |
| CN110542840A (en) * | 2019-09-11 | 2019-12-06 | 厦门理工学院 | Return voltage curve drawing method, terminal device and storage medium |
| CN111551792B (en) * | 2020-05-27 | 2022-05-31 | 哈尔滨理工大学 | Dielectric infinite high frequency relative dielectric constant measuring method |
| CN112180142B (en) * | 2020-09-08 | 2021-05-11 | 深圳圣斯尔电子技术有限公司 | Alternating voltage detection device |
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