CN105223532B - A kind of method for diagnosing faults of dry reactor higher-order of oscillation impulse withstand voltage experiment - Google Patents
A kind of method for diagnosing faults of dry reactor higher-order of oscillation impulse withstand voltage experiment Download PDFInfo
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Abstract
A kind of method for diagnosing faults of dry reactor higher-order of oscillation impulse withstand voltage experiment, this method for diagnosing faults is applied in the experiment of dry reactor higher-order of oscillation impulse withstand voltage, the fault diagnosis of test product is carried out by the transmission function for asking for subject dry reactor, fault diagnosis is carried out by comparing the transmission function maximum value under at different location and different tests voltage, avoids the erroneous judgement caused by the component failure of test loop.
Description
Technical field
The invention belongs to high voltage and insulation technology fields, and in particular to a kind of dry reactor higher-order of oscillation impulse withstand voltage
Method for diagnosing faults in experiment.
Background technology
Reactor is equipment important in power grid, with purposes such as reactive-load compensation, filtering, has quantity in power grid
More, the characteristics of being widely used.There are two types of the insulating forms of reactor, and one kind is oil immersed type, mainly using insulating oil as insulation
Medium；One kind is dry type, impregnates composition insulation using epoxy casting.Dry reactor has simple in structure, light-weight and cost
The advantages of low, the application in power grid are more and more extensive.Dry reactor in the process of running can be by network voltage, impact
The effect of voltage and environmental stress and gradually aging and deterioration, can break down in the process of running.Dry reactor is carried out
Off-line testing is the key that ensure its safe operation, and since dry reactor inductance value itself is big, conventional industrial frequency experiment can not
It carries out, therefore it is current hot spot to study suitable reactor test method.
Live impulse withstand voltage experiment is carried out to dry reactor using higher-order of oscillation impulse voltage endurance test method, there is voltage
Generation efficiency is high, is easy to the characteristics of live harmonic.Effective fault diagnosis is carried out during this experiment is carried out, judges test product
It is the key that carry out test result analysis with the presence or absence of breakdown fault.
However, due to involving many circuit components in dry reactor high-frequency percussion pressure test circuit, these electricity
Road component has significant impact with the presence or absence of failure to result of the test, and how the erroneous judgement that reactor can be caused to test avoids this
Kind erroneous judgement, accurately and effectively high-frequency percussion pressure test is carried out to dry reactor becomes the problem of current key.
Invention content
In order to solve above-mentioned problem, avoid due to erroneous judgement caused by the component failure of test loop, the present invention can be directed to dry
Different faults in the experiment of formula reactor higher-order of oscillation impulse withstand voltage are diagnosed, it is proposed that a kind of based on transfer function analysis
Method for diagnosing faults.
In the method for diagnosing faults, the circuit loop of the dry reactor higher-order of oscillation impulse withstand voltage that is diagnosed experiment
Mainly include standard impulse voltage generator 1, the first divider 2, the first current divider 3, oscillation inductance 4, load capacity 5, subject
Dry reactor 6, the second current divider 7 and the second divider 8.
Wherein, load capacity 5 is in parallel with subject 6 place circuit branch of dry reactor, the branch and oscillation that parallel connection is formed
Inductance 4, the concatenation of standard impulse voltage generator 1 form a circuit；Meanwhile to the voltage of specific location in the test loop
It is measured with electric current：First divider 2 is in parallel with standard impulse voltage generator, therefrom obtains voltage signal U1；Second point
Depressor 8 is in parallel with subject dry reactor 6, so as to obtain voltage signal U2；First current divider 3 is connected with oscillation inductance 4, is obtained
Current signal I1；After second current divider 7 is connected with subject dry reactor 6, current signal I2 is obtained.
The method for diagnosing faults by first after-applied different test voltage, measures the U1 under different tests voltage,
I1, U2, I2 ask for U1 under different tests voltage, the relevant transmission functions of I1 and the relevant transmission function of U2, I2, finally respectively
The diagnosis of different faults is carried out according to situation of change of two groups of transmission functions under different tests voltage.
Further, which is：
S10. the first test voltage is applied to subject dry reactor, obtains U1, I1, U2, I2；
S20. according to U1 and I1 calculation of transfer function H1, according to U2 and I2 calculation of transfer function H2；
Wherein, the specific formula for calculation of transmission function isFft (U) is that voltage signal is passed through quick Fu
Vertical leaf variation is transformed into frequency domain and obtains frequency domain distribution, and current signal is transformed into frequency domain by fast Fourier transform and obtained by fft (I)
To frequency domain distribution, and then, voltage signal and current signal are carried out than obtaining transfer function H in frequency domain；
S30. the second test voltage is applied to subject dry reactor, obtains U1 ', I1 ', U2 ', I2 '；
S40. according to U1 ' and I1 ' calculation of transfer function H1 ', according to U2 ' and I2 ' calculation of transfer function H2 '；
S50. compare H1, H2 and H1 ', H2 ' carries out fault diagnosis according to the situation of change of its maximum value.
Further, the step S50 is specifically included：
If S51. H1 ' compares the maximum value change rate of H1 and H2 with the maximum value of H2 ' and is less than ± 5%, judging should
Test product and the equal fault-free of oscillation inductance, load capacitance；
If S52. maximum value change rates of the H2 ' compared to H2 is less than ± 5%, and maximum value change rates of the H1 ' compared to H1 surpasses
± 5% has been crossed, then has judged test product fault-free and failure has occurred in oscillation inductance or load capacity.
S53. if maximum value change rates of the H2 ' compared to H2 is more than ± 5%, no matter maximum value change rates of the H1 ' compared to H1 is such as
What, judges that failure has occurred in test product.
Therefore this method for diagnosing faults is applied in the experiment of dry reactor higher-order of oscillation impulse withstand voltage, by asking
The transmission function of subject dry reactor is taken to carry out the fault diagnosis of test product.By comparing at different location and different tests electricity
The transmission function maximum value of pressure, different faults judge in can testing dry reactor higher-order of oscillation impulse withstand voltage,
Which includes the fault diagnosises of test loop component, avoid the erroneous judgement caused by the component failure of test loop.
Description of the drawings
Fig. 1 is the connection schematic diagram of test loop of the present invention；
Fig. 2 is Troubleshooting Flowchart in the present invention.
Specific embodiment
Below in conjunction with attached drawing, by specific embodiment, the present invention will be further described.
As shown in Figure 1, dry reactor high-frequency percussion pressure test circuit mainly includes standard impulse voltage in the present invention
Generator 1, the first divider 2, the first current divider 3, oscillation inductance 4, load capacity 5, subject dry reactor 6, second shunt
7 and second divider 8 of device.
Wherein, subject dry reactor 6 is put under the Impulse Voltage generated in standard impulse voltage generator
Electric test, load capacity 5 is in parallel with subject 6 place circuit branch of dry reactor, the branch and oscillation inductance 4 of parallel connection formation,
The concatenation of standard impulse voltage generator 1 forms a circuit.
Meanwhile the voltage and current of specific location is measured in the test loop：First divider 2 is rushed with standard
Voltage generator parallel connection is hit, therefrom obtains voltage signal U1；Second divider 8 is in parallel with subject dry reactor 6, so as to obtain
Voltage signal U2；First current divider 3 is connected with oscillation inductance 4, obtains current signal I1；Second current divider 7 and subject dry type electricity
After anti-device 6 is connected, current signal I2 is obtained.
Finally, U1, I1, U2, the I2 according to measured by under different tests voltage, and the calculating based on transmission function are carried out
The diagnosis of different faults.
The specific troubleshooting step is measured as shown in Fig. 2, by first after-applied different test voltage in different examinations
U1, I1, U2, the I2 of electrical verification pressure, ask for U1 under different tests voltage, the relevant transmission functions of I1 and U2, I2 are relevant respectively
Transmission function finally carries out fault diagnosis according to situation of change of two groups of transmission functions under different tests voltage.
In a specific embodiment, the dry reactor higher-order of oscillation impulse withstand voltage testing failure diagnosis algorithm packet
It includes：
S10. 50% test voltage is applied to subject dry reactor, obtains U1, I1, U2, I2；
S20. according to U1 and I1 calculation of transfer function H1, according to U2 and I2 calculation of transfer function H2；
Wherein, the specific formula for calculation of transmission function isFft (U) is that voltage signal is passed through quick Fu
Vertical leaf variation is transformed into frequency domain and obtains frequency domain distribution, and current signal is transformed into frequency domain by fast Fourier transform and obtained by fft (I)
To frequency domain point
Cloth, and then, voltage signal and current signal are carried out than obtaining transfer function H in frequency domain；
S30. 100% test voltage is applied to subject dry reactor, obtains U1 ', I1 ', U2 ', I2 '；
S40. according to U1 ' and I1 ' calculation of transfer function H1 ', according to U2 ' and I2 ' calculation of transfer function H2 '；
S50. compare H1, H2 and H1 ', H2 ' carries out fault diagnosis according to its situation of change.
Wherein, H1, H2 and H1 in step S5 ', the situation of change of H2 ' can be embodied by the change rate of its maximum value.One
In a more specific embodiment, the fault diagnosis in step S50 may include following specific judgment step：
If S51. H1 ' compares the maximum value change rate of H1 and H2 with the maximum value of H2 ' and is less than ± 5%, judging should
Test product and the equal fault-free of oscillation inductance, load capacitance；
If S52. maximum value change rates of the H2 ' compared to H2 is less than ± 5%, and maximum value change rates of the H1 ' compared to H1 surpasses
± 5% has been crossed, then has judged test product fault-free and failure has occurred in oscillation inductance or load capacity.
S53. if maximum value change rates of the H2 ' compared to H2 is more than ± 5%, no matter maximum value change rates of the H1 ' compared to H1 is such as
What, judges that failure has occurred in test product.
As it can be seen that the method for diagnosing faults based on the present invention, by comparing under at different location and different tests voltage
Transmission function maximum value carries out fault diagnosis, can obtain whether each component in test loop generates failure, so as in dry type
During reactor high-frequency percussion pressure test, the erroneous judgement caused by the component failure of test loop is avoided.
Here description of the invention and application are illustrative, are not wishing to limit the scope of the invention to above-described embodiment
In.The deformation and change of embodiments disclosed herein are possible, real for the ordinary skill of those this fields is any
The replacement and equivalent various parts for applying example are well known.Art technology is any it is noted that not departing from the present invention
Spirit or essential characteristics in the case of, the present invention can in other forms, structure, arrangement, ratio and with other components,
Material and component are realized.In the case where not departing from scope and spirit of the present invention, can to embodiments disclosed herein into
The other deformations of row and change.
Claims (5)
1. a kind of method for diagnosing faults of dry reactor higher-order of oscillation impulse withstand voltage experiment, which is characterized in that wrap test loop
Include standard impulse voltage generator (1), the first divider (2), the first current divider (3), oscillation inductance (4), load capacity (5),
It is tested dry reactor (6), the second current divider (7) and the second divider (8)；Wherein, load capacity (5) and subject dry type
Circuit branch is in parallel where reactor, and the branch that parallel connection is formed is concatenated with oscillation inductance (4), standard impulse voltage generator (1)
Form a circuit；The voltage and current of specific location is measured in the test loop, the first divider (2) and standard
Impulse voltage generator is in parallel, therefrom obtains voltage signal U1；First current divider (3) is connected with oscillation inductance (4), obtains electric current
Signal I1；After second current divider (7) is connected with subject dry reactor (6), current signal I2 is obtained；Second divider (8) with
It is in parallel to be tested dry reactor (6), so as to obtain voltage signal U2；Specifically, one end of standard impulse voltage generator (1) with
One end of first current divider (3), one end connection of the first divider (2), the other end of standard impulse voltage generator (1) and the
The other end of one divider (2), one end of load capacity (5), one end of the second current divider (7), the second divider (8) one end
Connection, the other end of the first current divider (3) are connect with one end of oscillation inductance (4), the other end and the load electricity of oscillation inductance (4)
Hold the other end of (5), one end of subject dry reactor (6), the connection of the second divider (8) other end, be tested dry reactor
(6) the other end is connect with the other end of the second current divider (7)；U1, I1, U2, I2 according to measured by under different tests voltage,
And the calculating based on transmission function, carry out fault diagnosis.
2. method for diagnosing faults according to claim 1, which is characterized in that the calculating of the transmission function and failure are examined
The journey that stops is to ask for U1 under different tests voltage respectively, the relevant transmission functions of I1 and the relevant transmission function of U2, I2, finally
Fault diagnosis is carried out according to situation of change of two groups of transmission functions under different tests voltage.
3. method for diagnosing faults according to claim 1, which is characterized in that the dry reactor higher-order of oscillation impulse withstand voltage
Testing failure diagnosis algorithm is：
S10. the first test voltage is applied to subject dry reactor, obtains U1, I1, U2, I2；
S20. according to U1 and I1 calculation of transfer function H1, according to U2 and I2 calculation of transfer function H2；
Wherein, the specific formula for calculation of transmission function isFft (U) is that voltage signal is passed through fast Flourier
Variation is transformed into frequency domain and obtains frequency domain distribution, and current signal is transformed into frequency domain by fast Fourier transform and obtains frequency by fft (I)
Domain is distributed, and then, voltage signal and current signal are compared acquisition transfer function H in frequency domain；
S30. the second test voltage is applied to subject dry reactor, obtains U1 ', I1 ', U2 ', I2 '；
S40. according to U1 ' and I1 ' calculation of transfer function H1 ', according to U2 ' and I2 ' calculation of transfer function H2 '；
S50. H1 and H1 are respectively compared ', H2 and H2 ', according to H1 ' compared to maximum value of the maximum value change rate, H2 ' of H1 compared to H2
The situation of change rate carries out fault diagnosis.
4. method for diagnosing faults according to claim 3, which is characterized in that first test voltage is the second experiment electricity
The half of pressure.
5. method for diagnosing faults according to claim 4, which is characterized in that the step S50 is specifically included：
If S51. maximum value change rates of the H1 ' compared to H1, maximum value change rates of the H2 ' compared to H2 are less than ± 5%, judge
The subject dry reactor and the equal fault-free of oscillation inductance, load capacitance；
If S52. maximum value change rates of the H2 ' compared to H2 is less than ± 5%, and maximum value change rates of the H1 ' compared to H1 is more than
± 5%, then judge to be tested dry reactor fault-free and failure has occurred in oscillation inductance or load capacity；
S53. if maximum value change rates of the H2 ' compared to H2 is more than ± 5%, no matter maximum value change rates of the H1 ' compared to H1,
Judge that failure has occurred in subject dry reactor.
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| CN111190125A (en) * | 2020-01-06 | 2020-05-22 | 长沙理工大学 | Discrimination method for detecting turn-to-turn insulation fault of air-core reactor by pulse voltage method based on FFT transform domain characteristics |
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