CN107561419A - A kind of appraisal procedure of oil-immersed sleeve pipe insulation bubble effect risk - Google Patents

A kind of appraisal procedure of oil-immersed sleeve pipe insulation bubble effect risk Download PDF

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CN107561419A
CN107561419A CN201710738032.5A CN201710738032A CN107561419A CN 107561419 A CN107561419 A CN 107561419A CN 201710738032 A CN201710738032 A CN 201710738032A CN 107561419 A CN107561419 A CN 107561419A
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mrow
sleeve pipe
msup
formula
oil
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CN107561419B (en
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王东阳
周利军
郭蕾
廖维
江俊飞
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Southwest Jiaotong University
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Abstract

The invention discloses a kind of appraisal procedure of oil-immersed sleeve pipe insulation bubble effect risk, step is：1) assess and prepare and test wiring；2) relative complex dielectric permittivity imaginary part test；3) it is fitted the test result of relative complex dielectric permittivity imaginary part；4) estimation set pipe insulation moisture；5) estimated temperature T traps pipe insulation reclaimed water vapour partial pressure；6) risk of oil-immersed sleeve pipe insulation bubble effect is assessed.The present invention more can accurately assess oil-immersed sleeve pipe insulation bubble effect risk it can be considered that influence of the aging to water vapor partial pressure in insulation of oil-immersed sleeve pipe.

Description

A kind of appraisal procedure of oil-immersed sleeve pipe insulation bubble effect risk
Technical field
The invention belongs to oil-immersed sleeve pipe insulation fault risk assessment field, and in particular to a kind of oil-immersed sleeve pipe insulation gas Steep the appraisal procedure of effect risk.
Background technology
Oil-immersed sleeve pipe is one of important auxiliary device of transformer, belongs to the visual plant of power system, is played height The effect that low-voltage lead is drawn from inside transformer, realize transformer and external electrical network connection and lead to transformer The insulation of shell.Oil-immersed sleeve pipe major insulation is insulating paper and aluminium foil capacitance plate alternating packets around the capacitor core rolled.Actual fortune Even if the good sleeve pipe of sealing in row, moisture also can by by army cap, take the exemplary positions such as plug cock, conservator invade sleeve pipe in Portion, when in sleeve pipe running when running temperature and insulation moisture reach critical value when, cover pipe insulation in water vapor partial pressure Critical value can be exceeded, the micro- water covered in pipe insulation can be separated out in the form of bubble, and this can not only cause sleeve pipe insulation electric field Distortion, can also increase the pressure of inside pipe casing, the blast of sleeve pipe can be especially directly contributed when precipitation process is especially violent, at present Effective monitoring means and method are there is no in actual production.In addition with the operation of sleeve pipe, the gradual aging of pipe insulation is covered, always Changing to produce to absorption of the insulation on moisture significantly influences, and then adds accurate evaluation oil-immersed sleeve pipe insulation bubble effect Risk difficulty.Therefore, in order to more accurately assess the risk of oil-immersed sleeve pipe insulation bubble effect, need further Consider influence of the aging to the wettability power that insulate, be badly in need of a kind of appraisal procedure of oil-immersed sleeve pipe insulation bubble effect risk.
The content of the invention
In order to more accurately assess the risk of oil-immersed sleeve pipe insulation bubble effect, and further consider aging pair The influence of insulation wettability power, the invention provides a kind of appraisal procedure of oil-immersed sleeve pipe insulation bubble effect risk.
A kind of appraisal procedure of oil-immersed sleeve pipe insulation bubble effect risk comprises the steps of：
The first step：Assess and prepare and test wiring
Check oil-immersed sleeve pipe nameplate to be assessed or report of dispatching from the factory, record having put into operation the time for oil-immersed sleeve pipe to be assessed (being designated as N), the high-pressure side of relative complex dielectric permittivity imaginary part tester is connected with sleeve pipe conservator leading-out terminal, dielectric will be answered relatively The low-pressure end of constant imaginary part tester is connected with bottom shielding of bushing lead-out wire, by the earth terminal of relative complex dielectric permittivity imaginary part tester It is connected with casing flange earthing or grounding means, the temperature tested and record test protheca pipe insulation is T (degree Celsius)；
Second step：Tested with respect to complex dielectric permittivity imaginary part
It is 1400 volts to set the output voltage of relative complex dielectric permittivity imaginary part tester, and setting test frequency scope is 0.01Hz to 1mHz (each test frequency point f includes 1mHz, 2mHz, 4mHz, 0.01Hz), unlatching will be with respect to complex dielectric permittivity imaginary part Tester carries out relative complex dielectric permittivity imaginary part frequency domain spectra test to sleeve pipe, obtains the relative complex dielectric permittivity imaginary part test of sleeve pipe As a result (0.01Hz Frequency point test results are designated as ε1", 4mHz Frequency point test results are designated as ε2", 2mHz Frequency point test results It is designated as ε3", 1mHz Frequency point test results are designated as ε4″)；
3rd step：It is fitted the test result to complex dielectric permittivity imaginary part
The relative complex dielectric permittivity imaginary part test result of sleeve pipe is changed into logarithmic coordinates system, is then based on formula (1) institute The straight line expression formula fitting test result shown, and then obtain the slope s and intercept b of the straight line expression formula shown in formula (1)；
Y=sx+b (1)
Y is log ε " in formula (1), and x is log ω, and ω is to survey the angular frequency value of each examination Frequency point and be equal to 2 π f；
4th step：Estimation set pipe insulation moisture
The content m.c. of moisture in sleeve pipe insulating paper is estimated based on formula (2)
M.c.=1.79 × (A-s-0.74)0.41 (2)
A is volume iron core tractive transformer dielectric characterization parameter in formula (2), shown in A estimation formula such as formula (3)
5th step：Estimated temperature T traps pipe insulation reclaimed water vapour partial pressure
When temperature T is more than 100 degrees Celsius, trapped pipe insulation reclaimed water vapour partial pressure p (units according to formula (4) estimated temperature T atm)
M is aging coefficient in formula (4), shown in M estimation formulas such as formula (5)：
6th step：Assess the risk of oil-immersed sleeve pipe insulation bubble effect
Set critical pressure value PL, the water vapor partial pressure value p that the 5th step is estimated to obtain is then based on, wind is calculated by formula (6) Dangerous coefficient H, and then the risk for the bubble effect that insulated to oil-immersed sleeve pipe makes assessment, it is pre- to send risk when H is more than 0.632 It is alert
K is Risk-warning parameter in formula (6), is set for a constant according to being actually needed.
Brief description of the drawings
A kind of appraisal procedure flow charts of oil-immersed sleeve pipe insulation bubble effect risk of Fig. 1
Embodiment
The invention will be further described below in conjunction with the accompanying drawings：
Fig. 1 show a kind of appraisal procedure flow chart of oil-immersed sleeve pipe insulation bubble effect risk.Can from Fig. 1 Go out a kind of appraisal procedure of oil-immersed sleeve pipe insulation bubble effect risk to mainly include the following steps that：
The first step：Assess and prepare and test wiring
Check oil-immersed sleeve pipe nameplate to be assessed or report of dispatching from the factory, record having put into operation the time for oil-immersed sleeve pipe to be assessed (being designated as N), the high-pressure side of relative complex dielectric permittivity imaginary part tester is connected with sleeve pipe conservator leading-out terminal, dielectric will be answered relatively The low-pressure end of constant imaginary part tester is connected with bottom shielding of bushing lead-out wire, by the earth terminal of relative complex dielectric permittivity imaginary part tester It is connected with casing flange earthing or grounding means, the temperature tested and record test protheca pipe insulation is T (degree Celsius)；
Second step：Tested with respect to complex dielectric permittivity imaginary part
It is 1400 volts to set the output voltage of relative complex dielectric permittivity imaginary part tester, and setting test frequency scope is 0.01Hz to 1mHz (each test frequency point f includes 1mHz, 2mHz, 4mHz, 0.01Hz), unlatching will be with respect to complex dielectric permittivity imaginary part Tester carries out relative complex dielectric permittivity imaginary part frequency domain spectra test to sleeve pipe, obtains the relative complex dielectric permittivity imaginary part test of sleeve pipe As a result (0.01Hz Frequency point test results are designated as ε1", 4mHz Frequency point test results are designated as ε2", 2mHz Frequency point test results It is designated as ε3", 1mHz Frequency point test results are designated as ε4″)；
3rd step：It is fitted the test result to complex dielectric permittivity imaginary part
The relative complex dielectric permittivity imaginary part test result of sleeve pipe is changed into logarithmic coordinates system, is then based on formula (1) institute The straight line expression formula fitting test result shown, and then obtain the slope s and intercept b of the straight line expression formula shown in formula (1)；
Y=sx+b (1)
Y is log ε " in formula (1), and x is log ω, and ω is to survey the angular frequency value of each examination Frequency point and be equal to 2 π f；
4th step：Estimation set pipe insulation moisture
The content m.c. of moisture in sleeve pipe insulating paper is estimated based on formula (2)
M.c.=1.79 × (A-s-0.74)0.41 (2)
A is volume iron core tractive transformer dielectric characterization parameter in formula (2), shown in A estimation formula such as formula (3)
5th step：Estimated temperature T traps pipe insulation reclaimed water vapour partial pressure
When temperature T is more than 100 degrees Celsius, trapped pipe insulation reclaimed water vapour partial pressure p (units according to formula (4) estimated temperature T atm)
M is aging coefficient in formula (4), shown in M estimation formulas such as formula (5)：
6th step：Assess the risk of oil-immersed sleeve pipe insulation bubble effect
Set critical pressure value PLFor 1.6atm, Risk-warning parameter k is set as 0.8, is then based on the 5th step and is estimated The water vapor partial pressure value p arrived, by formula (6) calculation risk coefficient H, and then the risk for the bubble effect that insulated to oil-immersed sleeve pipe is made Assess, Risk-warning is sent when H is more than 0.632.
。

Claims (1)

  1. A kind of 1. appraisal procedure of oil-immersed sleeve pipe insulation bubble effect risk, it can be considered that the aging of oil-immersed sleeve pipe is to insulation The influence of middle water vapor partial pressure, oil-immersed sleeve pipe insulation water vapor partial pressure can be more accurately obtained, to covering pipe insulation bubble effect Risk make effective assessment, it is characterised in that comprise the steps of：
    The first step：Assess and prepare and test wiring
    Check oil-immersed sleeve pipe nameplate to be assessed or report of dispatching from the factory, record having put into operation the time for oil-immersed sleeve pipe to be assessed and (be designated as N Year), the high-pressure side of relative complex dielectric permittivity imaginary part tester is connected with sleeve pipe conservator leading-out terminal, will be empty with respect to complex dielectric permittivity The low-pressure end of portion's tester is connected with bottom shielding of bushing lead-out wire, by the earth terminal and sleeve pipe of relative complex dielectric permittivity imaginary part tester Flange earthing or grounding means is connected, and the temperature tested and record test protheca pipe insulation is T (degree Celsius)；
    Second step：Tested with respect to complex dielectric permittivity imaginary part
    It is 1400 volts to set the output voltage of relative complex dielectric permittivity imaginary part tester, and setting test frequency scope is 0.01Hz to 1mHz (each test frequency point f includes 1mHz, 2mHz, 4mHz, 0.01Hz), unlatching will be with respect to complex dielectric permittivity imaginary part Tester carries out relative complex dielectric permittivity imaginary part frequency domain spectra test to sleeve pipe, obtains the relative complex dielectric permittivity imaginary part test of sleeve pipe As a result (0.01Hz Frequency point test results are designated as ε1", 4mHz Frequency point test results are designated as ε2", 2mHz Frequency point test results It is designated as ε3", 1mHz Frequency point test results are designated as ε4″)；
    3rd step：It is fitted the test result to complex dielectric permittivity imaginary part
    The relative complex dielectric permittivity imaginary part test result of sleeve pipe is changed into logarithmic coordinates system, is then based on shown in formula (1) Straight line expression formula is fitted test result, and then obtains the slope s and intercept b of the straight line expression formula shown in formula (1)；
    Y=sx+b (1)
    Y is log ε " in formula (1), and x is log ω, and ω is to survey the angular frequency value of each examination Frequency point and be equal to 2 π f；
    4th step：Estimation set pipe insulation moisture
    The content m.c. of moisture in sleeve pipe insulating paper is estimated based on formula (2)
    M.c.=1.79 × (A-s-0.74)0.41 (2)
    A is volume iron core tractive transformer dielectric characterization parameter in formula (2), shown in A estimation formula such as formula (3)
    <mrow> <mi>A</mi> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <mn>0.0628</mn> <mo>&amp;times;</mo> <msup> <msub> <mi>&amp;epsiv;</mi> <mn>1</mn> </msub> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msup> <mo>+</mo> <mn>0.02512</mn> <mo>&amp;times;</mo> <msup> <msub> <mi>&amp;epsiv;</mi> <mn>2</mn> </msub> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msup> <mo>+</mo> <mn>0.01256</mn> <mo>&amp;times;</mo> <msup> <msub> <mi>&amp;epsiv;</mi> <mn>3</mn> </msub> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msup> <mo>+</mo> <mn>0.00628</mn> <mo>&amp;times;</mo> <msup> <msub> <mi>&amp;epsiv;</mi> <mn>4</mn> </msub> <mrow> <mo>&amp;prime;</mo> <mo>&amp;prime;</mo> </mrow> </msup> <mo>)</mo> </mrow> <mn>4</mn> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>
    5th step：Estimated temperature T traps pipe insulation reclaimed water vapour partial pressure
    When temperature T is more than 100 degrees Celsius, trapped pipe insulation reclaimed water vapour partial pressure p (unit atm) according to formula (4) estimated temperature T
    <mrow> <mi>p</mi> <mo>=</mo> <msup> <mrow> <mo>&amp;lsqb;</mo> <mfrac> <mrow> <mi>m</mi> <mo>.</mo> <mi>c</mi> <mo>.</mo> </mrow> <mi>M</mi> </mfrac> <mi>exp</mi> <mrow> <mo>(</mo> <mo>-</mo> <mfrac> <mn>4725.6</mn> <mrow> <mi>T</mi> <mo>+</mo> <mn>273</mn> </mrow> </mfrac> <mo>)</mo> </mrow> <mo>&amp;rsqb;</mo> </mrow> <mrow> <mn>2000</mn> <mo>/</mo> <mn>1337</mn> </mrow> </msup> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>
    M is aging coefficient in formula (4), shown in M estimation formulas such as formula (5)：
    <mrow> <mi>M</mi> <mo>=</mo> <mo>&amp;lsqb;</mo> <mo>-</mo> <mn>3.46</mn> <mo>&amp;times;</mo> <msup> <mn>10</mn> <mrow> <mo>-</mo> <mn>9</mn> </mrow> </msup> <mrow> <mo>(</mo> <mi>T</mi> <mo>+</mo> <mn>273</mn> <mo>)</mo> </mrow> <mo>+</mo> <mn>1.22</mn> <mo>&amp;times;</mo> <msup> <mn>10</mn> <mrow> <mo>-</mo> <mn>6</mn> </mrow> </msup> <mo>&amp;rsqb;</mo> <mo>&amp;times;</mo> <msup> <mrow> <mo>(</mo> <mfrac> <mn>1</mn> <mrow> <mn>0.000752</mn> <mi>N</mi> <mo>+</mo> <mn>0.00091</mn> </mrow> </mfrac> <mo>)</mo> </mrow> <mrow> <mn>7</mn> <mo>&amp;times;</mo> <msup> <mn>10</mn> <mrow> <mo>-</mo> <mn>16</mn> </mrow> </msup> <mi>exp</mi> <mo>&amp;lsqb;</mo> <mrow> <mo>(</mo> <mi>T</mi> <mo>+</mo> <mn>273</mn> <mo>)</mo> </mrow> <mo>/</mo> <mn>10.34</mn> <mo>)</mo> <mo>+</mo> <mn>0.09</mn> </mrow> </msup> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>5</mn> <mo>)</mo> </mrow> </mrow>
    6th step：Assess the risk of oil-immersed sleeve pipe insulation bubble effect
    Set critical pressure value PL, the water vapor partial pressure value p that the 5th step is estimated to obtain is then based on, passes through formula (6) calculation risk coefficient H, and then the risk for the bubble effect that insulated to oil-immersed sleeve pipe makes assessment, and Risk-warning is sent when H is more than 0.632
    <mrow> <mi>H</mi> <mo>=</mo> <mn>1</mn> <mo>-</mo> <msup> <mi>e</mi> <mrow> <mo>-</mo> <mfrac> <mi>p</mi> <mrow> <msub> <mi>kP</mi> <mi>L</mi> </msub> </mrow> </mfrac> </mrow> </msup> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>6</mn> <mo>)</mo> </mrow> </mrow>
    K is Risk-warning parameter in formula (6), is set for a constant according to being actually needed.
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CN111366825A (en) * 2020-04-13 2020-07-03 国网陕西省电力公司电力科学研究院 Transformer bushing thermal bubble simulation generation device and initial temperature measurement method
CN113917293A (en) * 2021-09-24 2022-01-11 广东电网有限责任公司广州供电局 Method and system for evaluating insulation aging state of high-voltage dry-type sleeve based on frequency domain and time domain
CN113985012A (en) * 2021-10-27 2022-01-28 中电华创电力技术研究有限公司 Mineral turbine oil degradation risk assessment method
CN115308543A (en) * 2022-08-03 2022-11-08 重庆大学 Method for determining waveform parameter range with maximum influence on air insulation fault risk rate

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CN111366825A (en) * 2020-04-13 2020-07-03 国网陕西省电力公司电力科学研究院 Transformer bushing thermal bubble simulation generation device and initial temperature measurement method
CN113917293A (en) * 2021-09-24 2022-01-11 广东电网有限责任公司广州供电局 Method and system for evaluating insulation aging state of high-voltage dry-type sleeve based on frequency domain and time domain
CN113985012A (en) * 2021-10-27 2022-01-28 中电华创电力技术研究有限公司 Mineral turbine oil degradation risk assessment method
CN113985012B (en) * 2021-10-27 2024-04-12 中电华创电力技术研究有限公司 Mineral turbine oil degradation risk assessment method
CN115308543A (en) * 2022-08-03 2022-11-08 重庆大学 Method for determining waveform parameter range with maximum influence on air insulation fault risk rate
CN115308543B (en) * 2022-08-03 2023-12-22 重庆大学 Method for determining waveform parameter range with maximum influence on air insulation fault risk rate

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