CN105259425B - The method of testing of the lower transformer oil clearance relative dielectric constant of low frequency sinusoidal excitation - Google Patents
The method of testing of the lower transformer oil clearance relative dielectric constant of low frequency sinusoidal excitation Download PDFInfo
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Abstract
The invention discloses the method for testing that a kind of low frequency sinusoidal encourages lower transformer oil clearance relative dielectric constant.The DC conductivity σ of transformer oil clearance under temperature T is obtained by test first0Transformer oil clearance intermediate ion mobility [mu], the thickness L of transformer oil clearance, apply the angular frequency that low frequency sinusoidal encourages, then the above-mentioned data measured are substituting in correlation formula and handled, finally obtain the relative dielectric constant of the lower transformer oil clearance of low frequency sinusoidal excitation.The inventive method can be on the basis of transformer oil clearance relative dielectric constant under effectively calculating low frequency sinusoidal excitation, additionally it is possible to reflects the electrode polarization parameter of the lower transformer oil clearance of low frequency sinusoidal excitation.
Description
Technical field
The invention belongs to transformer insulation state detection field, and in particular to a kind of lower transformer oil clearance of low frequency sinusoidal excitation
The method of testing of relative dielectric constant.
Background technology
Oil-filled transformer is the unique selection of main transformer in current super-pressure, extra-high voltage electric transmission and transformation system, oil immersed type
The operational reliability of transformer is directly connected to the safety and stability of associate power system, and oil-filled transformer is in power system
Nucleus equipment, paper oil insulation state be determine oil-filled transformer insulation life an important factor for one of, frequency domain dielectric response method
It is one of accepted method for being capable of efficient diagnosis paper oil insulation moisture and its ageing state.Oil-filled transformer paper oil insulation
System is made up of transformer oil clearance, paper web pressing plate and stay etc., and transformer oil clearance is the important component of Oil-Paper Insulation.
When Oil-Paper Insulation carries out the test of frequency domain dielectric response, apply outside sinusoidal excitation voltage by high frequency to low frequency progress by
Frequency sweep test, when low-frequency test, the effect of electromagnetic field of transformer oil clearance is to determine Oil-Paper Insulation overall dielectric
One of principal element of characteristic, and the main influencing mechanism of effect of electromagnetic field of transformer oil clearance is by electricity inside transformer oil clearance
Conductance for alternating current caused by the polarization of pole, therefore in order to more comprehensive research, the lower paper oil insulation system of sign low frequency sinusoidal excitation
The effect of electromagnetic field of system, so as to which preferably dielectric spectroscopy method is applied in Practical Project, being badly in need of one kind can either
The relative dielectric constant of the lower transformer oil clearance of low frequency sinusoidal excitation is calculated, while and can enough characterizes the lower transformer of low frequency sinusoidal excitation
The method of oil clearance electrode polarization parameter.
The content of the invention
In order to calculate the relative dielectric constant of the lower transformer oil clearance of low frequency sinusoidal excitation, while and can enough characterizes low frequency
Transformer oil clearance electrode polarization parameter under sinusoidal excitation, the present invention provide a kind of lower transformer oil clearance of low frequency sinusoidal excitation and are situated between relatively
The method of testing of electric constant.
A kind of method of testing of the lower transformer oil clearance relative dielectric constant of low frequency sinusoidal excitation, Oil-Paper Insulation frequency domain are situated between
The relative dielectric constant and oil clearance electrode polarization parameter of the lower transformer oil clearance of low frequency sinusoidal excitation are obtained in electroresponse test, it is special
Sign is, comprises the steps of：
1.1 are passed to following data under test temperature T by the sensor being arranged in experimental provision：Transformer oil clearance it is straight
Flow conductivityσ0, transformer oil clearance intermediate ion mobility [mu], the thickness L of transformer oil clearance；Measurement obtains applying low frequency sinusoidal excitation
Angular frequency；
1.2 by the data input that above-mentioned test obtains into the model (1) in computing unit, obtain low frequency sinusoidal excitation under
The relative dielectric constant of transformer oil clearance：
In formula, q is unit electric charge carried charge, k=1.38 × 10-23J/K is Boltzmann constant, εr=2.2 be transformer
Oily power frequency relative dielectric constant, ε 0=8.85 × 10-12F/m is permittivity of vacuum, ε 'f、ε”fRespectively apply sinusoidal excitation
The relative dielectric constant real part of transformer oil clearance, relative dielectric constant imaginary part, ε ' during frequency f=0.1Hzr(ω)、ε”r(ω) point
Not Wei angular frequency be ω the relative dielectric constant real part of the lower transformer oil clearance of low frequency sinusoidal excitation, relative dielectric constant imaginary part；
The data in model (2) of 1.2 the data obtaineds in computing unit, obtained are substituted into following formula by 1.3 can then obtain low frequency
The relaxation time τ of transformer oil clearance electrode polarization under sinusoidal excitationEPWith electrode polarization polarization layer thickness LD：
1.4 will export to subsequent processing units or result display unit obtained by 1.2 and 1.3 steps.
The formulation process of method of testing of the present invention is as follows：
When transformer oil clearance does not apply outside sinusoidal excitation, the transformer oil in transformer oil clearance has when reaching thermal balance：
In formula, n+、n-Respectively negative ion concentrations in transformer oil clearance, transformer oil clearance reach during thermal balance it is positive and negative from
The equal concentration of son is n0, σ0For the DC conductivity of transformer oil clearance, q is unit electric charge institute carried charge.When application low frequency sinusoidal
During driving voltage, transformer oil clearance internal electrode polarization process can be completed and transformer oil clearance inner ion concentration balances again
Required relaxation time τEPFor：
In formula, k=1.38 × 10-23J/K is Boltzmann constant, εr=2.2 be that transformer oil power frequency is normal with respect to dielectric
Number, ε0=8.85 × 10-12F/m is permittivity of vacuum, and T is the temperature of transformer oil clearance.Now, caused by near electrode
Polarization layer thickness LDFor：
Formula (3) is substituted into formula (4), formula (5) can obtain：
Electrode polarization parameter shown in formula (6) is updated in Debye relaxation models, relative Jie of transformer oil can be obtained
Electric constant expresses equation：
ω is applied voltage angular frequency in formula, Δ εEPExpression formula is：
ΔεEP=(L/2LD-1)εr (8)
Formula (6) is substituted into formula (7) to obtain
In view of before galvanic polarization, due to the effect of the dipole pilot polarization inside transformer oil clearance etc.,
Its dielectric parameter has occurred and that change, and the time scale of ion warm-up movement, then formula (9) should be rewritten as：
In formula, ε 'f、ε”fThe relative dielectric constant of transformer oil clearance is real when respectively applying the frequency f=0.1Hz of excitation
Portion, relative dielectric constant imaginary part.
The present invention can calculate the relative dielectric constant of the lower transformer oil clearance of low frequency sinusoidal excitation, at the same and can enough characterize it is low
Transformer oil clearance electrode polarization parameter under frequency sinusoidal excitation, help more comprehensively to study, characterize the lower change of low frequency sinusoidal excitation
The effect of electromagnetic field of depressor oil clearance, so as to which preferably dielectric spectroscopy method is applied in Practical Project.
Brief description of the drawings
A kind of method of testing flow chart of the lower transformer oil clearance relative dielectric constant of low frequency sinusoidal excitations of Fig. 1
A kind of method of testing example of the lower transformer oil clearance relative dielectric constant of low frequency sinusoidal excitations of Fig. 2
Embodiment
The invention will be further described below in conjunction with the accompanying drawings：
Fig. 1 show a kind of method of testing flow chart of the lower transformer oil clearance relative dielectric constant of low frequency sinusoidal excitation.From
A kind of method of testing of the lower transformer oil clearance relative dielectric constant of low frequency sinusoidal excitation of it can be seen from the figure that mainly includes following step
Suddenly：
1.1 tests obtain the temperature T of transformer oil clearance；
Under 1.2 test temperature T, the DC conductivity σ of transformer oil clearance0, transformer oil clearance intermediate ion mobility [mu]；
The thickness L of 1.3 measuring transformer oil clearances；
1.4 measurements apply the angular frequency of low frequency sinusoidal excitation；
1.5 data for obtaining above-mentioned test substitute into following formula, obtain relative Jie of the lower transformer oil clearance of low frequency sinusoidal excitation
Electric constant：
In formula, q is unit electric charge carried charge, k=1.38 × 10-23J/K is Boltzmann constant, εr=2.2 be transformer
Oily power frequency relative dielectric constant, ε0=8.85 × 10-12F/m is permittivity of vacuum, ε 'f、ε”fRespectively apply the frequency of excitation
The relative dielectric constant real part of transformer oil clearance, relative dielectric constant imaginary part, ε ' during f=0.1Hzr(ω)、ε”r(ω) is respectively
The relative dielectric constant real part for the lower transformer oil clearance of low frequency sinusoidal excitation that angular frequency is ω, relative dielectric constant imaginary part.
Low frequency sinusoidal excitation can be obtained while transformer oil clearance relative dielectric constant under calculating low frequency sinusoidal excitation
The parameter of bottom electrode polarization, i.e., the lower transformer oil clearance of low frequency sinusoidal excitation can then be obtained by the data that above-mentioned test obtains being substituted into following formula
The relaxation time τ of electrode polarizationEPWith electrode polarization polarization layer thickness LD：
Fig. 2 show a kind of method of testing example of the lower transformer oil clearance relative dielectric constant of low frequency sinusoidal excitation.Measure
Transformer oil clearance temperature is 30 DEG C, and it is 7.23 × 10 to measure transformer oil clearance DC conductivity at 30 DEG C-13S/m, transformation at 30 DEG C
Device oil clearance intermediate ion mobility is 1.73 × 10-10m2/ Vs, the thickness 0.5mm of oil clearance, when to apply driving voltage frequency outside be 0.1Hz
Measuring transformer oil clearance relative dielectric constant is：ε'f=3.86, ε "f=0.8.Calculated as shown in Figure 2 using the inventive method
The lower transformer oil clearance relative permittivity value of low frequency sinusoidal excitation preferably can meet with experiment test value, calculated value and actual measurement
It is worth error in 5%, in tolerance interval, while the transformer oil clearance electricity under environment described in example can be obtained in calculating process
Pole polarization parameter is：The relaxation time τ of electrode polarizationEPFor 824s, polarization layer thickness is about 0.018mm.Then illustrate present invention side
Method can effectively obtain the lower transformer oil clearance relative permittivity value of low frequency sinusoidal excitation, while and can accesses sign low frequency
The parameter of transformer oil clearance electrode polarization under sinusoidal excitation.
Claims (1)
1. a kind of method of testing of the lower transformer oil clearance relative dielectric constant of low frequency sinusoidal excitation, Oil-Paper Insulation frequency domain dielectric
The relative dielectric constant and oil clearance electrode polarization parameter of the lower transformer oil clearance of low frequency sinusoidal excitation, its feature are obtained in response test
It is, comprises the steps of：
1.1 are passed to following data under test temperature T by the sensor being arranged in experimental provision：The direct current of transformer oil clearance
Conductance σ0, transformer oil clearance intermediate ion mobility [mu], the thickness L of transformer oil clearance, measure and obtain the angle for applying low frequency sinusoidal excitation
Frequencies omega；
1.2 by the data input that above-mentioned test obtains into the model (1) in computing unit, obtain the lower transformation of low frequency sinusoidal excitation
The relative dielectric constant of device oil clearance：
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In formula, q is unit electric charge carried charge, k=1.38 × 10-23J/K is Boltzmann constant, εr=2.2 be transformer oil work
Frequency relative dielectric constant, ε0=8.85 × 10-12F/m is permittivity of vacuum, ε 'f、ε″fRespectively apply the frequency of sinusoidal excitation
The relative dielectric constant real part of transformer oil clearance, relative dielectric constant imaginary part, ε ' during f=0.1Hzr(ω)、ε″r(ω) is respectively
The relative dielectric constant real part for the lower transformer oil clearance of low frequency sinusoidal excitation that angular frequency is ω, relative dielectric constant imaginary part, T is survey
Try temperature, σ0For the DC conductivity of transformer oil clearance, μ is transformer oil clearance intermediate ion mobility, and L is the thickness of transformer oil clearance
Degree, ω are the angular frequency for applying low frequency sinusoidal excitation；
The data in model (2) of the 1.2 step the data obtaineds in computing unit, obtained are substituted into following formula by 1.3 can then obtain low frequency
The relaxation time τ of transformer oil clearance electrode polarization under sinusoidal excitationEPWith electrode polarization polarization layer thickness LD：
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In formula, q is unit electric charge carried charge, k=1.38 × 10-23J/K is Boltzmann constant, εr=2.2 be transformer oil work
Frequency relative dielectric constant, ε0=8.85 × 10-12F/m is permittivity of vacuum, and T is test temperature, σ0For the straight of transformer oil clearance
Electrical conductivity is flowed, μ is transformer oil clearance intermediate ion mobility, and L is the thickness of transformer oil clearance, and ω is to apply low frequency sinusoidal excitation
Angular frequency；
1.4 will export to subsequent processing units or result display unit obtained by 1.2 steps and 1.3 steps.
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| CN105974278B (en) * | 2016-04-25 | 2018-10-30 | 西南交通大学 | Oil clearance telegram in reply holds accelerated test method under low frequency mixed excitation based on Sine-Fitting |
| CN106053955B (en) * | 2016-07-08 | 2018-12-25 | 西南交通大学 | A kind of low frequency sinusoidal motivates the test method of lower Oil-Paper Insulation relative dielectric constant |
| CN108061826B (en) * | 2017-08-24 | 2019-01-25 | 西南交通大学 | The method of inspection of large-scale rewinding material tractive transformer winding technological effect |
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