CN108181513B - Inter-phase coupling capacitance testing method and system for lightning arrester based on pilot frequency method - Google Patents
Inter-phase coupling capacitance testing method and system for lightning arrester based on pilot frequency method Download PDFInfo
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Abstract
The invention relates to the technical field of measurement, in particular to a lightning arrester interphase coupling capacitance testing method and system based on a pilot frequency method. The method adopts a pilot frequency measurement method and is matched with a high-precision strong anti-interference frequency selection measurement device to realize the correct measurement of the interphase coupling capacitance of the lightning arrester. The invention can achieve the purposes of simple and safe test and is expected to become a solution for safe, simple, convenient, efficient and accurate measurement of the interphase coupling capacitance of the lightning arrester.
Description
Technical Field
The invention relates to the technical field of measurement, in particular to a lightning arrester interphase coupling capacitance testing method and system based on a pilot frequency method.
Background
The capacitive current compensation method, which is the mainstream test method in the lightning arrester live test at present, cannot accurately measure the resistive current value due to safety reasons, that is, a large principle error is caused by not taking a PT secondary signal or taking a station variable reference voltage instead, and due to field interphase interference, instruments and the like, even the problems of erroneous judgment and missing judgment occur, so that the effectiveness of the live test technology in lightning arrester defect diagnosis is influenced.
The capacitive current compensation method is the most mature method in principle in the existing lightning arrester live test, and the capacitive part in the total current is compensated by taking a system voltage signal as a reference to obtain a resistive current component reflecting the active loss of the lightning arrester.
However, the three-phase lightning arresters are installed in a straight line on site, and due to the inter-phase coupling capacitance and electromagnetic interference, each phase of lightning arrester is under the action of the voltage of the current phase and the adjacent phase voltage through inter-phase coupling, so that the accuracy of the monitoring result is influenced.
The field arrangement mode brings the influence of interphase interference to the live test of the lightning arrester, and although existing mature instruments have an interphase compensation function, the effect in practical application is not ideal. The existing lightning arrester live-line test method cannot obtain the accurate value of the resistive current, the live-line test result does not pursue the accuracy of the test data, the effectiveness of the live-line test is mainly reflected in the transverse comparison of the test data, the lightning arresters with individual deterioration can be found in the transverse comparison, the state of the lightning arresters with batch and familial defects is difficult to reflect, and the early defects of the lightning arresters are difficult to find.
The live test also has the condition of misjudgment, and in the actual field test, the live test also has the condition that the problem is found in the live test, but the test is abnormal after power failure.
At present, a plurality of charged test instrument manufacturers exist, the test principle and the anti-interference capability are different, the equipment quality is good and uneven, historical data cannot be used for longitudinal comparison in practice, and the deterioration trend of the lightning arrester is difficult to reflect from the historical data. And 4, in 2013, at 25 months and 4 months, the 500kV Chayan line arrester of the 500kV head station fails due to lightning stroke, after that, the direct current test of the sound phase arrester shows that the leakage current exceeds the standard, the deterioration of the resistance card is confirmed, and the failure is caused by analyzing the deterioration of the resistance card under the condition of bearing the accumulated impact of multiple lightning strokes, accelerating the deterioration and causing thermal breakdown under the subsequent operating voltage. And (3) calling the live test data of the arrester in nearly three years, and finding that the resistive component of the leakage current of the arrester is slightly increased in the 2011 test process, and the maximum amplification is 3.2% of the A phase. Newly purchasing an arrester live-line test instrument with strong anti-interference capability in 2012, greatly reducing the resistive component of the arrester leakage current, wherein the maximum reduction amplitude is 36.2% of an A phase, the test result is qualified, certain deviation exists in the live-line test result due to different instruments, the degradation trend of the arrester resistance sheet is not effectively reflected, and finally, the internal defect of the arrester cannot be effectively detected, so that accidents occur.
The lightning arrester also brings the problem of high interference on site due to the complex environment of the test site. The test data is easily affected by the temperature, humidity and rainfall of the environment, the surface pollution degree of the lightning arrester, the electromagnetic environment and the like, and inaccurate data is caused.
The other current problem is safety problem, inconvenience and potential safety hazard exist when voltage transformer signals are obtained on site, ① misoperation risk exists due to the fact that operating personnel are required to be matched with and connected into the voltage transformer signals, ② isolation devices are required to be additionally arranged to prevent the signals in the instrument from being connected into the voltage transformer in series, ③ short circuit risk exists in the voltage transformer signals, and the technical development direction of safe and simple lightning arrester live test is not met.
Because the existing lightning arrester live-line test technology has the defects, the effectiveness of the existing live-line test data is insufficient.
Disclosure of Invention
The invention provides a lightning arrester interphase coupling capacitance testing method and system based on a pilot frequency method, which are safe and reliable and are used for overcoming at least one defect in the prior art.
The technical scheme of the invention is as follows: an arrester interphase coupling capacitance test method based on a pilot frequency method is characterized in that the method takes measuring of the interphase coupling capacitance of A, B phase arresters as an example and comprises the following steps:
step one, determining that a tested arrester is in a power failure state, suspending the upper end of an A, B-phase arrester, directly grounding the lower end of a B-phase arrester, directly grounding the lower end of an A-phase arrester, and connecting a weak current transformer to a grounding wire of the A-phase arrester;
the output end of the variable frequency signal source is connected with a low-voltage terminal of a high-voltage PT, the high-voltage output terminal of the PT is connected with the upper end of a B-phase lightning arrester, and the shell of the PT is directly grounded;
thirdly, outputting a pilot frequency voltage signal U between 40 Hz and 70Hz by using a variable frequency signal source, and pressurizing the B-phase lightning arrester;
measuring the pilot frequency current I of the A-phase lightning arrester and a pilot frequency voltage signal U output by a variable frequency signal source by using a high-precision strong anti-interference frequency-selecting measuring device;
step five, the transformation ratio of PT is K, the frequency of the pilot frequency signal for testing is f, and the interphase coupling capacitance C of A, B phases under the frequency f can be calculatedAB=I/2πfUK；
And step six, similarly, the interphase coupling capacitance of the B, C-phase lightning arrester and the interphase coupling capacitance of the A, C-phase lightning arrester can be respectively measured.
Further, in the first step, the lightning arrester is a lightning arrester which is operated without electricity.
Further, in the first step, the weak current transformer is connected to a ground wire of the lightning arrester, and the measurement range is selected to be 0-5 mA.
Further, in the second step, the voltage level of the high-voltage PT is determined according to the voltage level of the lightning arrester to be tested, and the high-voltage output voltage of the high-voltage PT is 50% -100% of the rated voltage of the lightning arrester to be tested.
Furthermore, in the fourth step, the high-precision frequency-selecting measuring device with strong anti-interference and weak current adopts a strong anti-interference frequency-selecting measuring technology, so that the anti-interference capability of measurement and the reliability of data are greatly improved.
The system applying the inter-phase coupling capacitance testing method of the lightning arrester based on the pilot frequency method comprises the following steps: the device comprises a three-phase lightning arrester to be detected, a variable frequency signal source, a high-voltage PT, a weak current transformer, a high-precision strong anti-interference frequency-selecting measuring device, a commercial power 220V power supply, a grounding grid and a connecting wire;
the 220V mains supply is connected to a variable frequency signal source to supply power to a system, the output of the variable frequency signal source is connected to a low-voltage terminal of a high-voltage PT, the high-voltage output of the high-voltage PT is connected to the upper end of a B-phase lightning arrester, a shell of the high-voltage PT is grounded, the upper end of an A, B-phase lightning arrester is suspended, the lower end of the B-phase lightning arrester is directly grounded, the lower end of the A-phase lightning arrester is also directly grounded, a weak current transformer is connected to a grounding wire of the A-phase lightning arrester, the output of the weak current transformer is connected to a current measuring terminal of a high-precision strong anti-interference frequency-selecting measuring device to measure the different-frequency current of the A-phase, the output of the variable frequency signal source is connected to a voltage measuring terminal of the high-precision strong anti-interference frequency-selecting.
Compared with the prior art, the beneficial effects are: (1) the measurement is carried out by adopting a 40-70Hz pilot frequency method, so that the interference of the on-site power frequency can be effectively avoided, and the equivalence with the power frequency can be ensured. (2) The anti-interference capability is strong, and the weak pilot frequency vector can be accurately measured under the interference of thousands of times of power frequency current. (3) The intelligent degree is high. The measuring range can be automatically switched, the result can be stored, the test waveform can be derived, and further technical analysis is facilitated. (4) The core part of the system is a CPU and a software algorithm.
Drawings
FIG. 1 is a diagram of the steps of the test method of the present invention.
FIG. 2 is a diagram of a test system of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
Fig. 1 shows steps of a lightning arrester early defect live-line test method based on a full current harmonic vector. Taking the measurement of the interphase coupling capacitance of the A, B-phase lightning arrester as an example, the measurement method comprises the steps that the upper end of the A, B-phase lightning arrester is suspended, the lower end of the B-phase lightning arrester is directly grounded, the lower end of the A-phase lightning arrester is also directly grounded, and a weak current transformer is connected to a grounding wire of the A-phase lightning arrester. The output end of a variable frequency signal source is connected with a low-voltage terminal of a high-voltage PT, the high-voltage output terminal of the PT is connected with the upper end of a B-phase lightning arrester, a pilot frequency voltage signal between 40 and 70Hz is output by the variable frequency signal source, a pilot frequency leakage current I of the A-phase lightning arrester and a pilot frequency voltage signal U output by the variable frequency signal source are measured by a high-precision strong anti-interference weak current frequency-selecting measuring device, the transformation ratio of the PT is K, the frequency of the pilot frequency signal for testing is f, and an interphase coupling capacitor C of A, B phases under the frequency f can be calculatedABAnd (h) = I/2 pi fUK. Similarly, the interphase coupling capacitance of the B, C-phase lightning arrester and the A, C-phase lightning arrester can be measured respectively.
Fig. 2 shows an arrester interphase coupling capacitance test system based on a pilot frequency method, which comprises a tested three-phase arrester, a variable frequency signal source, a high-voltage PT, a weak current transformer, a high-precision strong anti-interference frequency-selecting measuring device, a commercial power 220V power supply, a grounding grid and a connecting wire.
Taking the measurement of the interphase coupling capacitance of the A, B-phase lightning arrester as an example, a 220V mains supply is connected to a variable frequency signal source to supply power to a system; the output of the variable frequency signal source is connected to a low-voltage terminal of the high-voltage PT; the high-voltage output of the high-voltage PT is connected to the upper end of the B-phase lightning arrester, and the shell of the high-voltage PT is grounded; A. the upper end of the B-phase lightning arrester is suspended, the lower end of the B-phase lightning arrester is directly grounded, the lower end of the A-phase lightning arrester is also directly grounded, a weak current transformer is connected to the ground wire of the transformer; the output of the weak current transformer is connected to the current measuring terminal of the high-precision strong anti-interference frequency-selecting measuring device, measuring the A-phase pilot frequency current, connecting the output of the frequency-variable signal source to the voltage measuring terminal of the high-precision strong anti-interference frequency-selecting measuring device, the transformation ratio of the high-voltage PT is set on the high-precision strong anti-interference frequency-selecting measuring device, and the interphase coupling capacitance of the A, B-phase lightning arrester can be automatically calculated.
The invention adopts the pilot frequency method to test, because the electromagnetic environment of the test site is very complicated, especially the interference of the power frequency magnetic field is very serious, the pilot frequency method in the invention adopts the frequency different from the power frequency but close to the power frequency to test, the method separates the power frequency interference from the measured signal by using a non-50 Hz test power supply, avoids the measurement error caused by the interference, and simultaneously can ensure the equivalence with the power frequency.
The lightning arrester to be detected in the invention must be a lightning arrester which does not operate in power failure, and the lightning arrester to be detected needs to be pressurized and can be realized only by the lightning arrester which does not operate in power failure.
The current transformer adopts a weak current transformer, and the interphase coupling current in the lightning arrester is microampere-level, so that the sampled current transformer is required to accurately sample microampere-level signals and provide a precondition for accurate measurement.
The voltage grade of the high-voltage PT is determined according to the rated voltage of the tested lightning arrester, and is generally selected to be 50% -100% of the rated voltage of the tested lightning arrester.
The high-precision strong anti-interference frequency-selecting measuring device can accurately measure weak pilot frequency current signals under thousands of times of interference.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (6)
1. An arrester interphase coupling capacitance test method based on a pilot frequency method is characterized in that the method takes measuring of the interphase coupling capacitance of A, B phase arresters as an example and comprises the following steps:
step one, determining that a tested arrester is in a power failure state, suspending the upper end of an A, B-phase arrester, directly grounding the lower end of a B-phase arrester, directly grounding the lower end of an A-phase arrester, and connecting a weak current transformer to a grounding wire of the A-phase arrester;
the output end of the variable frequency signal source is connected with a low-voltage terminal of a high-voltage PT, the high-voltage output terminal of the PT is connected with the upper end of a B-phase lightning arrester, and the shell of the PT is directly grounded;
thirdly, outputting a pilot frequency voltage signal U between 40 Hz and 70Hz by using a variable frequency signal source, and pressurizing the B-phase lightning arrester;
measuring the pilot frequency current I of the A-phase lightning arrester and a pilot frequency voltage signal U output by a variable frequency signal source by using a high-precision strong anti-interference frequency-selecting measuring device;
step five, the transformation ratio of PT is K, the frequency of the pilot frequency signal for testing is f, and the interphase coupling capacitance C of A, B phases under the frequency f can be calculatedAB＝I/(2πfUK)；
And step six, similarly, the interphase coupling capacitance of the B, C-phase lightning arrester and the interphase coupling capacitance of the A, C-phase lightning arrester can be respectively measured.
2. The inter-phase coupling capacitance testing method of the lightning arrester based on the pilot frequency method according to claim 1, characterized in that: in the first step, the lightning arrester is operated without electricity.
3. The inter-phase coupling capacitance testing method of the lightning arrester based on the pilot frequency method according to claim 1, characterized in that: in the first step, the weak current transformer is connected to a grounding wire of the A-phase lightning arrester, and the measurement range of the weak current transformer is selected to be 0-5 mA.
4. The inter-phase coupling capacitance testing method of the lightning arrester based on the pilot frequency method according to claim 1, characterized in that: in the second step, the voltage grade of the high-voltage PT is determined according to the voltage grade of the tested lightning arrester, and the high-voltage output voltage of the high-voltage PT is 50% -100% of the rated voltage of the tested lightning arrester.
5. The inter-phase coupling capacitance testing method of the lightning arrester based on the pilot frequency method according to claim 1, characterized in that: in the fourth step, the high-precision strong anti-interference weak current frequency selection measuring device adopts a strong anti-interference frequency selection measuring technology.
6. The system for testing the inter-phase coupling capacitance of the lightning arrester based on the pilot frequency method is applied to the inter-phase coupling capacitance testing method of the lightning arrester based on the pilot frequency method, and is characterized in that: the device comprises a three-phase lightning arrester to be detected, a variable frequency signal source, a high-voltage PT, a weak current transformer, a high-precision strong anti-interference frequency-selecting measuring device, a commercial power 220V power supply, a grounding grid and a connecting wire;
the commercial power 220V power supply is connected to the variable frequency signal source to supply power to the system; the output of the variable frequency signal source is connected to a low-voltage terminal of the high-voltage PT; the high-voltage output of the high-voltage PT is connected to the upper end of the B-phase lightning arrester, and the shell of the high-voltage PT is grounded; the upper end of the A-phase lightning arrester is suspended, the lower end of the B-phase lightning arrester is directly grounded, the lower end of the A-phase lightning arrester is also directly grounded, and a weak current transformer is connected to a ground wire of the A-phase lightning arrester; the output of the weak current transformer is connected to a current measuring terminal of the high-precision strong anti-interference frequency-selecting measuring device, the pilot frequency current of the A phase is measured, meanwhile, the output of the variable frequency signal source is connected to a voltage measuring terminal of the high-precision strong anti-interference frequency-selecting measuring device, the transformation ratio of the high-voltage PT is set on the high-precision strong anti-interference frequency-selecting measuring device, and the interphase coupling capacitance of the A, B-phase lightning arrester can be automatically calculated.
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| CN114167165B (en) * | 2021-11-12 | 2022-08-23 | 西南交通大学 | Lightning arrester valve plate service state evaluation method considering power pickup under multiple pulses |
| CN115060997A (en) * | 2022-06-22 | 2022-09-16 | 云南电网有限责任公司电力科学研究院 | Coil testing method, voltage transformer, system, computer device and medium |
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