CN107064239A - A kind of method that transformer insulating paper conductance property is analyzed based on differential charge - Google Patents
A kind of method that transformer insulating paper conductance property is analyzed based on differential charge Download PDFInfo
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Abstract
A kind of method that transformer insulating paper conductance property is analyzed based on differential charge, is comprised the following steps：Polarization/depolarization current of aging test product is measured using electrometer；According to the relational expression between the conductance quantity of electric charge and polarization/depolarization current, the slope of conductance electric charge is obtained；Secondly according to the relation between insulating paper electrical conductivity and dielectric response function, the expression formula between transformer insulating paper electrical conductivity and conductance electric charge slope is obtained；Contrasted to using conduction current method and trying to achieve overall electrical conductivity using electric charge calculus of finite differences with the overall electrical conductivity that insulation diagnosis analyzer is measured, the computational accuracy of comparative analysis electric charge calculus of finite differences；The electrical conductivity of insulating paper is sought using differential charge method；The electrical conductivity for the transformer insulating paper finally tried to achieve using least square method to electric charge calculus of finite differences is fitted, and fitting draws the mathematical relationship between electrical conductivity and days of ageing.The present invention can not only reduce on-site noise interference, can also shorten time of measuring, with good promotional value.
Description
Technical field
It is particularly a kind of that transformer insulating paper conductance property is analyzed based on differential charge the present invention relates to technical field of electricity
Method.
Background technology
Normally operation of the power transformer to power network is particularly significant, in operation, due to by electric air and heat and environmental stress
Effect, the state of its Oil-Paper Insulation changes, and the insulation ag(e)ing condition diagnosing of transformer is research both at home and abroad at present
One of focus.Large-scale power transformer generally uses paper oil insulation structure, and solid insulation has expendable aging special
Property, its performance state has conclusive influence to the service life and maintenance strategy of transformer.Transformer is in longtime running mistake
Cheng Zhong, insulating paper receives the effect of a variety of external stresses such as electricity, heat, chemistry and machinery, under these stress, causes certainly
The insulating properties and mechanical strength of body are gradually reduced, and then are likely to result in the failure of transformer.The life-span of transformer is mainly depended on
In the ageing state of Oil-Paper Insulation, when the life-span of insulating paper is close to its terminal, the normal operation of transformer can be produced
Very big influence.
By the influence that the decline of solid insulating material insulating properties is brought will be far longer than the influence of insulating oil, and by
In the characteristic of solid insulating material in itself, it is difficult to recover the insulating properties of solid insulating material by methods such as degassing filters,
The conductance property of solid insulating material due to that can reflect the state of insulation of dielectric to a certain extent, so transformation at present
The conductance property of device solid dielectric insulation is of great interest.Traditional Condition assessment of insulation method needs to enter transformer
Row hangs cover sampling, and insulating paper can be caused to a certain extent to damage.It is new that nearest decades domestic and foreign scholars propose some
Diagnostic method, these methods are based on dielectric response.Differential charge method is a kind of based on the theoretical scene of dielectric response
The nondestructive testing method of Diagnosis for Power Transformer, it can characterize the insulation status and ageing state of medium, and can be significantly
Shorten the extensive concern that time of measuring receives domestic and foreign scholars.
The content of the invention
In view of this, the technical problems to be solved by the invention are to provide a kind of transformer insulated based on differential charge analysis
The method of paper conductance property, can not only reduce on-site noise interference, can also shorten time of measuring, with good promotion price
Value.
The technical scheme that the present invention takes is：
A kind of method that transformer insulating paper conductance property is analyzed based on differential charge, is comprised the following steps：
Step 1)：Aging 7 days, 21 days, 35 days, the polarization of 49 days samples/go are measured using 6517B types electrometer respectively
Polarization current；
Step 2)：According to the relational expression between the conductance quantity of electric charge and polarization/depolarization current, the oblique of conductance electric charge is obtained
Rate；Secondly according to the relation between insulating paper electrical conductivity and dielectric response function, transformer insulating paper electrical conductivity and conductance are obtained
Expression formula between electric charge slope；
Step 3)：To using conduction current method and using electric charge calculus of finite differences, trying to achieve overall electrical conductivity exhausted with IDAX-300
The overall electrical conductivity that edge diagnositc analyser is measured is contrasted, the computational accuracy of comparative analysis electric charge calculus of finite differences；
Step 4)：The electrical conductivity of insulating paper is asked for using differential charge method；
Step 5)：The electrical conductivity tried to achieve using least square method to electric charge calculus of finite differences is fitted, and fitting draws electrical conductivity
Mathematical relationship between days of ageing.
Polarization/the depolarization current, the electrical conductivity of oilpaper system is asked using conduction current method and differential charge is used
Method seeks the electrical conductivity of oilpaper system, is calculated by below equation：
Wherein, C0For geometric capacitance；εrFor relative dielectric constant；σrFor the electrical conductivity of Oil-Paper Insulation；F (t) is time domain
Receptance function；idc=ipol-idep；K is the slope of differential charge.
The conduction current electrical conductivity overall with transformer oil paper insulation and differential charge slope and paper oil insulation system
The electrical conductivity of system is calculated by below equation：
Wherein, C0For geometric capacitance；ε0For permittivity of vacuum；K is the slope of differential charge.
The electrical conductivity for asking for insulating paper using differential charge method can be calculated by below equation：
Wherein, C0For geometric capacitance；ε0For permittivity of vacuum；K is the slope of differential charge；X=0.35.
The conductance property for analyzing transformer insulating paper by differential charge method is carried out according to the following steps：
Step one：Calculate the electrical conductivity without insulating paper under ageing time；
Step 2：It is fitted the functional relation of electrical conductivity and ageing time：δ=A*exp* (B*t)；
Step 3：The aging conditions of insulating paper are judged according to the relation between electrical conductivity and ageing time；
Wherein, δ represents the electrical conductivity of insulating paper, and A represents constant obtained by matched curve, and B represents constant obtained by matched curve,
T represents days of ageing.
The present invention is a kind of method that transformer insulating paper conductance property is analyzed based on differential charge, and technique effect is as follows：
1), the present invention has drawn differential charge in increase with days of ageing, cardboard also gradually by testing measurement
Increase, while the slope of differential charge is also incremented by with the increase of days of ageing.This important conclusion is the different aging shapes of analysis
Under state, the charge variation feature in Oil-Paper Insulation provides foundation.
2), differential charge method proposed by the invention has, saving measurement small by noise jamming for comparing other methods
The characteristics of time, high computational accuracy.In addition, differential charge method need not hang cover to transformer insulating paper progress and sample, no
Destroying its internal structure can just analyze its conductance property.
3), the quantitative functional relation given between insulating paper electrical conductivity and ageing time of the present invention.Because solid is exhausted
The influence that the decline of edge material insulation property is brought will be far longer than the influence of insulating oil, and due to solid insulating material in itself
Characteristic, it is difficult to recover the insulating properties of solid insulating material by methods such as degassing filters.Insulation given by the present invention
Functional relation between paper electrical conductivity and ageing time provides basis for estimation for the aging state of insulation of insulating paper, is transformer
The maintenance of solid insulation, normal operation provide new thinking.
Brief description of the drawings
Fig. 1 is schematic flow sheet of the invention.
Fig. 2 is polarization/depolarization current test connection figure.
Fig. 3 is polarization/depolarization current curve map under different days of ageing.
Fig. 4 is conduction current figure under different days of ageing.
Fig. 5 is the electric charge slope figure under different days of ageing.
Fig. 6 is electrical conductivity and the matched curve figure of days of ageing.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail；It should be appreciated that preferred embodiment is only
In order to illustrate the present invention, the protection domain being not intended to be limiting of the invention.
Fig. 1 is the method flow provided in an embodiment of the present invention that transformer insulating paper conductance property is analyzed based on differential charge
Figure, as shown in the figure：A kind of method that transformer insulating paper conductance property is analyzed based on differential charge that the present invention is provided, including with
Lower step：
Step (1)：Using 6517B types electrometer measure respectively aging 7 days, 21 days, 35 days, the polarization of 49 days samples/
Depolarization current.
Step (2)：According to the relational expression between the conductance quantity of electric charge and polarization/depolarization current, the oblique of conductance electric charge is obtained
Rate；Secondly according to the relation between insulating paper electrical conductivity and dielectric response function, transformer insulating paper electrical conductivity and conductance are obtained
Expression formula between electric charge slope.
Step (3)：Respectively to trying to achieve the overall electrical conductivity of transformer oil paper insulation using conduction current method and using electric charge
The overall electrical conductivity that the electrical conductivity that calculus of finite differences is tried to achieve is measured with IDAX-300 insulation diagnosis analyzers is contrasted, comparative analysis
The measurement accuracy of electric charge calculus of finite differences.
Step (4)：The electrical conductivity of insulating paper is tried to achieve using electric charge calculus of finite differences.Insulating paper electrical conductivity in the present embodiment with absolutely
Edge paper days of ageing follows exponential function relation, and insulating paper aging is more serious, and insulating paper electrical conductivity is bigger, with insulating paper aging journey
The increase of degree, exponentially rule increases insulating paper electrical conductivity.
Step (5)：The electrical conductivity tried to achieve using least square method to electric charge calculus of finite differences is fitted, and fitting draws electrical conductivity
Mathematical relationship between days of ageing.
Polarization/the depolarization current, the electrical conductivity for seeking using conduction current method oilpaper system；And use differential charge
Method asks the electrical conductivity of oilpaper system and the electrical conductivity of insulating paper to be calculated by below equation：
（4）
Wherein, C0For geometric capacitance；εrFor relative dielectric constant；σrFor the electrical conductivity of Oil-Paper Insulation；F (t) is time domain
Receptance function；idc=ipol-idep；K is the slope of differential charge；X=0.35；Δ q is charge difference corresponding in the Δ t times.
The conduction current electrical conductivity overall with transformer oil paper insulation and differential charge slope and paper oil insulation system
The electrical conductivity of system is calculated by below equation：
Wherein, C0For geometric capacitance；ε0For permittivity of vacuum；K is the slope of differential charge.
The method by being analyzed transformer insulating paper conductance property based on differential charge is carried out according to the following steps：
Step one：The electrical conductivity of insulating paper under different ageing times is calculated using differential charge method；
Step 2：It is fitted the functional relation of electrical conductivity and ageing time：δ=A*exp* (B*t)；
Step 3：The aging conditions of insulating paper are judged according to the relation between electrical conductivity and ageing time；
Wherein, δ represents the electrical conductivity of insulating paper, and A represents constant obtained by matched curve, and B represents constant obtained by matched curve,
T represents days of ageing.
The test circuit for polarization/depolarization current that Fig. 2 provides for present invention implementation, in 0~tcIn time, S is connected1, this
When the electric current that measures be polarization current, tcWhen, applied voltage is removed, S is disconnected1, connect S2, the electric current now measured is depolarising
Electric current.
Fig. 3 is the present invention to polarization/depolarization current measured by the sample implemented.
As seen from Figure 3：When days of ageing increase, the cellulosic molecule of insulating board will be broken in aging, be gathered
It is right to reduce, it is intermolecular to become loose, can also the generation of the highly polar aging accessory substances such as moisture, organic acid be accompanied by, therefore lead
Polarization depolarization current value is caused also to increase with the increase of days of ageing.Simultaneously as the degradation with aging of insulating board, paper
The change of the structure of plate will cause more interfacial polarizations, and then increase polarization depolarization current.
Fig. 4 by the present invention to the conduction current that measures of implementation sample.As seen from Figure 4：Ageing time at the same temperature
When different, with the increase of ageing time, conduction current is in increasing trend, because with the intensification of degree of aging, oilpaper
Moisture and impurity that insulation system is produced by aging etc. cause the insulating properties of Oil-Paper Insulation to be gradually deteriorated, the conduction of system
Therefore performance can also increase.After a measurement the phase, conduction current gradually tends to be steady, because as the polarization depolarising time surveys
The increase of examination time, the polarization process of depolarization of system gradually tends towards stability, and conduction current is polarization current and depolarising electricity
The difference of stream, therefore conduction current is also gradually intended to stabilization.
Fig. 5 by the present invention to the quantity of electric charge that measures of implementation sample.As seen from Figure 5, the differential charge of different aging samples
With preferable discrimination, and the interference of noise is smaller, and differential charge is in be incremented by state with the increase of time of measuring, and poor
The slope of electric charge is divided to increase with the increase of days of ageing.
Fig. 6 is electrical conductivity and the matched curve figure of days of ageing.It will be appreciated from fig. 6 that aging insulating paper electrical conductivity and aging day
Fitting effect is very good between number, insulating paper electrical conductivity with ageing time increase exponentially function increase, this change of electrical conductivity
Law can be used for the ageing state for assessing insulating paper.
Claims (5)
1. a kind of method that transformer insulating paper conductance property is analyzed based on differential charge, it is characterised in that comprise the following steps：
Step 1)：Measure aging 7 days, 21 days, 35 days, polarization/depolarization current of 49 days samples respectively using electrometer；
Step 2)：According to the relational expression between the conductance quantity of electric charge and polarization/depolarization current, the slope of conductance electric charge is obtained；Its
The secondary relation according between insulating paper electrical conductivity and dielectric response function, obtains transformer insulating paper electrical conductivity and conductance electric charge is oblique
Expression formula between rate；
Step 3)：To using conduction current method and using electric charge calculus of finite differences, trying to achieve overall electrical conductivity and insulation diagnosis analyzer
The overall electrical conductivity measured is contrasted, the computational accuracy of comparative analysis electric charge calculus of finite differences；
Step 4)：The electrical conductivity of insulating paper is asked for using differential charge method；
Step 5)：The electrical conductivity tried to achieve using least square method to electric charge calculus of finite differences is fitted, and fitting draws electrical conductivity and old
Change the mathematical relationship between number of days.
2. according to claim 1 it is a kind of based on differential charge analyze transformer insulating paper conductance property method, its feature
It is：
Polarization/the depolarization current, the electrical conductivity for seeking using conduction current method oilpaper system and asked using differential charge method
The electrical conductivity of oilpaper system, is calculated by below equation：
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Wherein, C0For geometric capacitance；εrFor relative dielectric constant；σrFor the electrical conductivity of Oil-Paper Insulation；F (t) is time domain response
Function；idc=ipol-idep；K is the slope of differential charge.
3. according to claim 1 it is a kind of based on differential charge analyze transformer insulating paper conductance property method, its feature
It is：
The electrical conductivity and differential charge slope and Oil-Paper Insulation of the conduction current and transformer oil paper insulation entirety
Electrical conductivity is calculated by below equation：
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Wherein, C0For geometric capacitance；ε0For permittivity of vacuum；K is the slope of differential charge.
4. according to claim 1 it is a kind of based on differential charge analyze transformer insulating paper conductance property method, its feature
It is：
The electrical conductivity for asking for insulating paper using differential charge method can be calculated by below equation：
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1
Wherein, C0For geometric capacitance；ε0For permittivity of vacuum；K is the slope of differential charge；X=0.35.
5. according to claim 1 it is a kind of based on differential charge analyze transformer insulating paper conductance property method, its feature
It is：
The conductance property for analyzing transformer insulating paper by differential charge method is carried out according to the following steps：
Step one：Calculate the electrical conductivity without insulating paper under ageing time；
Step 2：It is fitted the functional relation of electrical conductivity and ageing time：δ=A*exp* (B*t)；
Step 3：The aging conditions of insulating paper are judged according to the relation between electrical conductivity and ageing time；
Wherein, δ represents the electrical conductivity of insulating paper, and A represents constant obtained by matched curve, and B represents constant obtained by matched curve, t tables
Show days of ageing.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107941862A (en) * | 2017-10-17 | 2018-04-20 | 广西电网有限责任公司电力科学研究院 | A kind of transformer oil Aging of Oil-paper Insulation in Oil diagnostic system based on frequency domain dielectric response |
| CN111562440A (en) * | 2020-05-27 | 2020-08-21 | 哈尔滨理工大学 | Insulating dielectric resistivity measurement principle based on time domain least square fitting |
| CN112147467A (en) * | 2020-08-24 | 2020-12-29 | 天津大学 | Cable insulation branch degradation detection method based on leakage current integral charge |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002015929A (en) * | 2000-06-28 | 2002-01-18 | Hitachi Ltd | Deterioration diagnosing device of oil-immersed electrical apparatus |
| CN102680870A (en) * | 2012-05-31 | 2012-09-19 | 刘志万 | Insulation performance testing method of electric power devices |
| CN103063991A (en) * | 2012-12-28 | 2013-04-24 | 四川电力科学研究院 | Oil-immersed transformer insulation paper polymerization degree test method based on return voltage |
| CN103063989A (en) * | 2012-12-28 | 2013-04-24 | 四川电力科学研究院 | Transformer oil paper insulation state testing device and control method based on return voltage method |
| CN105866644A (en) * | 2016-05-27 | 2016-08-17 | 三峡大学 | System for automatically collecting transformer oil paper insulation return voltage and testing method |
| CN106021756A (en) * | 2016-05-27 | 2016-10-12 | 三峡大学 | Method for assessing insulation state of oil paper based on characteristic quantity of frequency domain dielectric spectroscopy |
-
2017
- 2017-02-24 CN CN201710103554.8A patent/CN107064239A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002015929A (en) * | 2000-06-28 | 2002-01-18 | Hitachi Ltd | Deterioration diagnosing device of oil-immersed electrical apparatus |
| CN102680870A (en) * | 2012-05-31 | 2012-09-19 | 刘志万 | Insulation performance testing method of electric power devices |
| CN103063991A (en) * | 2012-12-28 | 2013-04-24 | 四川电力科学研究院 | Oil-immersed transformer insulation paper polymerization degree test method based on return voltage |
| CN103063989A (en) * | 2012-12-28 | 2013-04-24 | 四川电力科学研究院 | Transformer oil paper insulation state testing device and control method based on return voltage method |
| CN105866644A (en) * | 2016-05-27 | 2016-08-17 | 三峡大学 | System for automatically collecting transformer oil paper insulation return voltage and testing method |
| CN106021756A (en) * | 2016-05-27 | 2016-10-12 | 三峡大学 | Method for assessing insulation state of oil paper based on characteristic quantity of frequency domain dielectric spectroscopy |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107941862A (en) * | 2017-10-17 | 2018-04-20 | 广西电网有限责任公司电力科学研究院 | A kind of transformer oil Aging of Oil-paper Insulation in Oil diagnostic system based on frequency domain dielectric response |
| CN111562440A (en) * | 2020-05-27 | 2020-08-21 | 哈尔滨理工大学 | Insulating dielectric resistivity measurement principle based on time domain least square fitting |
| CN112147467A (en) * | 2020-08-24 | 2020-12-29 | 天津大学 | Cable insulation branch degradation detection method based on leakage current integral charge |
| CN112147467B (en) * | 2020-08-24 | 2022-07-01 | 天津大学 | Cable insulation branch degradation detection method based on leakage current integral charge |
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Application publication date: 20170818 |