CN108919026B - Live detection method for leakage current of lightning arrester - Google Patents
Live detection method for leakage current of lightning arrester Download PDFInfo
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- CN108919026B CN108919026B CN201810524567.7A CN201810524567A CN108919026B CN 108919026 B CN108919026 B CN 108919026B CN 201810524567 A CN201810524567 A CN 201810524567A CN 108919026 B CN108919026 B CN 108919026B
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- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 230000008859 change Effects 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000016507 interphase Effects 0.000 abstract description 5
- 230000032683 aging Effects 0.000 abstract description 2
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- 238000004458 analytical method Methods 0.000 description 1
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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Abstract
The invention relates to a live detection method for leakage current of a lightning arrester, which sequentially comprises the following steps: acquiring three-phase leakage current and three-phase operation voltage, acquiring phase angle of current lead voltage, and acquiring compensation angle phi OA And phi OC Calculating leakage current resistance component I AR 、I BR And I CR Judging the condition of the lightning arrester; the invention has the advantages that: the three-phase operation voltage is obtained through the bus voltage transformation secondary side, so that the method is simple and easy to operate, high in anti-interference performance and high in reliability; then by compensating the angle phi OA And phi OC The included angle of the voltage and the current is compensated, so that the influence of inter-phase interference of the lightning arrester on a measurement result can be basically eliminated; finally, the resistive component of the leakage current is calculated, so that the aging and the damp situation of the lightning arrester can be better reflected.
Description
Technical Field
The invention relates to a live detection method for leakage current of a lightning arrester.
Background
The arrester is an electrical appliance for protecting electrical equipment from high transient overvoltage damage and limiting the follow current time and always limiting follow current assignment, is usually connected between a power grid wire and a ground wire and is also connected beside an electrical appliance winding or between wires, in the using process of the arrester, leakage current electrification detection is needed to be carried out on the arrester, namely, the full current and the resistive current fundamental wave peak value of the arrester are mainly measured, then whether the interior of the arrester is affected by moisture or not and whether a metal oxide valve plate is deteriorated or not is judged according to the change of the two values, the conventional method for the leakage current electrification detection of the arrester is a fundamental wave method and a waveform analysis method, when the leakage current electrification detection is carried out on a group of normally-performing three-phase arresters, the result is often expressed as that A phase resistive current is greater than B phase resistive current is greater than C phase resistive current, and sometimes even the C phase resistive current is negative, however, the situation that the leakage current electrification detection is carried out on the arrester in operation is affected by phase interference, so that the measured full current and the resistive current has deviation, and the judgment result of detection personnel is affected.
Disclosure of Invention
The invention aims to solve the technical problem of inaccurate test results caused by the existing inter-phase interference by providing a live detection method for leakage current of a lightning arrester.
In order to solve the technical problems, the invention is realized by the following technical scheme: the live detection method of the leakage current of the lightning arrester sequentially comprises the following steps:
step one: three-phase leakage current is obtained from the lower end grounding lead of the lightning arrester respectivelyThree-phase operating voltages are detected from the secondary side of the busbar voltage change>And according to three-phase leakage currentObtaining three-phase full current I AX 、I BX And I CX ；
Step two: according to step oneTo calculate the phase angle phi of the current lead voltage A 、φ B 、φ C ；
Step three: phi calculated according to the step two A 、φ C To calculate the compensation angle phi OA And phi OC ；
Step four: phase angle phi calculated according to step two A 、φ B 、φ C And the compensation angle calculated in the step three
φ OA And phi OC Determining leakage current resistance component I AR 、I BR And I CR ；
Step five: according to the three-phase full current I obtained in the step one AX 、I BX And I CX The leakage current resistance component I calculated in the step four AR 、I BR And I CR To judge the condition of the lightning arrester.
Preferably, the three-phase leakage current in the first stepThree-phase operating voltageAre all obtained by measurement of an alternating current sampling analyzer, and +.> Each of which is represented by the following formula:
wherein: i AX 、I BX And I CX Is three-phase full current phi IA Is thatPhase angle phi of phi IB Is->Phase angle phi of phi IC Is->Phase angle of U A Is->Amplitude of phi UA Is->Phase angle of U B Is->Amplitude of phi UB Is->Phase angle of U C Is->Amplitude of phi UC Is->Is a phase angle of (c).
Preferably, the phase angle phi in step two A 、φ B 、φ C Calculated by the following formula, respectively, wherein:
φ A ＝φ IA -φ UA ；
φ B ＝φ IB -φ UB ；
φ C ＝φ IC -φ UC 。
preferably, the compensation angle phi in step three OA And phi OC Calculated by the following formula, respectively, wherein:
φ OA ＝(φ C -φ A )/2；
φ OC ＝-(φ C -φ A )/2。
preferentially, the resistive component I in step four AR 、I BR 、I CR Calculated by the following formula, respectively, wherein:
I AR ＝I AX cos(φ A +φ OA )；
I BR ＝I BX cosφ B ；
I CR ＝I CX cos(φ C +φ OC )。
preferentially, the condition of the lightning arrester is judged in the fifth step by the following method: under the same environmental conditions, the leakage current resistive component I AR 、I BR And I CR The increment is less than or equal to 30 percent compared with the last time or the initial value, and the three-phase full current I AX 、I BX And I CX The increment is less than or equal to 20 percent compared with the last time or the initial value, and when the leakage current resistance component I AR 、I BR And I CR The test period should be shortened and the monitoring should be enhanced when the increase of 0.3 times is carried out, when the leakage current resistance component I AR 、I BR And I CR When the number is increased by 1 time, the power failure is checked.
In summary, the invention has the advantages that: the three-phase operation voltage is obtained through the bus voltage transformation secondary side, so that the method is simple and easy to operate, high in anti-interference performance and high in reliability; then by compensating the angle phi OA And phi OC The included angle of the voltage and the current is compensated, so that the influence of inter-phase interference of the lightning arrester on a measurement result can be basically eliminated; finally, the resistive component of the leakage current is calculated, so that the aging and damp conditions of the lightning arrester can be better reflected, the detection quality of detection personnel is ensured, the lightning arrester can be overhauled in the first time when the lightning arrester breaks down, and the reliable and stable work of the lightning arrester is ensured.
Drawings
Fig. 1 is an equivalent circuit diagram of the inter-phase interference of the lightning arrester;
fig. 2 is a phasor diagram of the phase-to-phase interference leakage current of the arrester.
Detailed Description
Because stray capacitance exists between the phases of the three-phase lightning arrester, the amplitude and phase angle of the full current measured by the detection device can be influenced, the full current is specifically analyzed by adopting a lumped parameter circuit model, the circuit model is shown in fig. 1, and for simplifying the problem, only the fundamental wave is analyzed. Z is Z A 、Z B 、Z C The self-impedance of each three phases respectively representing the lightning arrester A, B, C is generally between-81 degrees and-86 degrees, and Z is as follows AB 、Z BA 、Z AC 、Z CA 、Z BC 、Z CB Respectively representing the transimpedance caused by the inter-phase stray capacitance, and the impedance angle is-90 degrees; the current measured by the detection device is I AX 、I BX 、I CX 。
When the three phases of the lightning arrester are uniformly distributed in a straight line, Z can be considered as A ＝Z B ＝Z C >Z AB ＝Z BA ＝Z BC ＝Z CB >Z CA ＝Z AC . Thus, a leakage current phasor diagram is obtained, as shown in FIG. 2, in which I AX 、I BX 、I CX Is the leakage total current detected by the instrument, and I AA 、I BB 、I CC Is the leakage total current actually flowing through the lightning arrester, and the leakage current measurement value I after the phase B is interfered by the phase B can be seen from the figure 2 BX And leakage current I actually passing through the B-phase lightning arrester BB Leakage current leads U compared with smaller amplitude B Angle phi of (2) B Slightly smaller. The phase angles of the A phase and the C phase are greatly influenced, phi A Obviously become smaller, phi C Obviously larger, and generally generates a deviation of 2 to 4 degrees.
The live detection method of the leakage current of the lightning arrester sequentially comprises the following steps:
step one: respectively obtaining three-phase leakage currents from lower-end grounding leads of the lightning arrester Three-phase operating voltages are detected from the secondary side of the busbar voltage change>And is dependent on three-phase leakage current->Obtaining three-phase full current I AX 、I BX And I CX ；
Step two: according to step oneTo calculate the phase angle phi of the current lead voltage A 、φ B 、φ C ；
Step three: phi calculated according to the step two A 、φ C To calculate the compensation angle phi OA And phi OC ；
Step four: phase angle phi calculated according to step two A 、φ B 、φ C And the compensation angle calculated in the step three
φ OA And phi OC Determining leakage current resistance component I AR 、I BR And I CR ；
Step five: according to the three-phase full current I obtained in the step one AX 、I BX And I CX The leakage current resistance component I calculated in the step four AR 、I BR And I CR To judge the condition of the lightning arrester.
Three-phase leakage current in the first stepThree-phase operating voltage ∈ -> Are all obtained by measurement of an alternating current sampling analyzer, and +.>Each of which is represented by the following formula:
wherein: i I AX 、I BX And I CX Is three-phase full current phi IA Is thatPhase angle phi of phi IB Is->Phase angle phi of phi IC Is thatPhase angle of U A Is->Amplitude of (a) of (b)，φ UA Is->Phase angle of U B Is->Amplitude of phi UB Is->Phase angle of U C Is->Amplitude of phi UC Is->Is a phase angle of (c).
The phase angle phi in step two A 、φ B 、φ C Calculated by the following formula, respectively, wherein:
φ A ＝φ IA -φ UA ；
φ B ＝φ IB -φ UB ；
φ C ＝φ IC -φ UC 。
the compensation angle phi in step three OA And phi OC Calculated by the following formula, respectively, wherein:
φ OA ＝(φ C -φ A )/2；
φ OC ＝-(φ C -φ A )/2。
the resistive component I in step four AR 、I BR 、I CR Calculated by the following formula, respectively, wherein:
I AR ＝I AX cos(φ A +φ OA )；
I BR ＝I BX cosφ B ；
I CR ＝I CX cos(φ C +φ OC )。
step five, judging the condition of the lightning arrester by the following method: under the same environmental conditions, the leakage current resistive component I AR 、I BR And I CR The increment is less than or equal to 30 percent compared with the last time or the initial value, and the three-phase full current I AX 、I BX And I CX The increment is less than or equal to 20 percent compared with the last time or the initial value, and when the leakage current resistance component I AR 、I BR And I CR The test period should be shortened and the monitoring should be enhanced when the increase of 0.3 times is carried out, when the leakage current resistance component I AR 、I BR And I CR When the number is increased by 1 time, the power failure is checked.
In addition to the above preferred embodiments, the present invention has other embodiments, and various changes and modifications may be made by those skilled in the art without departing from the spirit of the invention, which is defined in the appended claims.
Claims (4)
1. A live detection method for leakage current of a lightning arrester is characterized by comprising the following steps: the method sequentially comprises the following steps of:
step one: three-phase leakage current is obtained from the lower end grounding lead of the lightning arrester respectively、/>、/>And respectively acquiring three-phase operation voltages from the secondary side of the busbar voltage change>、/>、/>And according to three-phase leakageFlow->、/>、/>Acquiring three-phase full current->；
Step two: according to step one、/>、/>、/>、/>、/>To calculate the phase angle of the current lead voltage>；
Step three: according to the calculation of the step twoTo calculate the compensation angle +.>The compensation angleCalculated by the following formula, respectively, wherein:
;
;
step four: phase angle calculated according to step twoAnd the compensation angle calculated in step three +.>Finding out leakage current resistance component +.>The leakage current resistive component +.>Respectively lead to
Calculated by the following formula, wherein:
;
;
;
step five: according to the three-phase full current obtained in the step oneStep four, calculatingLeakage current resistive component of->To judge the condition of the lightning arrester.
2. A method according to claim 1, characterized in that: three-phase leakage current in the first step、、/>And a three-phase operating voltage +.>、/>、/>Are all obtained by measurement of an alternating current sampling analyzer, and +.>、、/>、/>、/>、/>Each of which is represented by the following formula:
wherein:is three-phase full current->Is->Phase angle of>Is->Phase angle of>Is thatPhase angle of U A Is->Amplitude of>Is->Phase angle of U B Is->Amplitude of>Is->Phase angle of U C Is->Amplitude of>Is->Is a phase angle of (c).
3. A method according to claim 2, characterized in that: the phase angle in step twoCalculated by the following formula, respectively, wherein:
4. a method according to claim 1, characterized in that: step five, judging the condition of the lightning arrester by the following method: under the same environmental conditions, the leakage current resistive componentThe increment should be less than or equal to 30% compared with the last time or the initial value, and the three-phase full current is +.>The increment should be less than or equal to 20% compared with the last time or the initial value, when the leakage current resistance component +.>The test period should be shortened and the monitoring should be enhanced when the increase of 0.3 times is carried out, and the leakage current resistance componentWhen the number is increased by 1 time, the power failure is checked.
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| CN110488069A (en) * | 2019-08-09 | 2019-11-22 | 国网浙江省电力有限公司温州市洞头区供电公司 | Insulating stretchable type clamp ammeter |
| CN111308296B (en) * | 2020-04-16 | 2021-05-11 | 国网山西省电力公司电力科学研究院 | Method for evaluating state of valve plate of lightning arrester |
| CN111751598B (en) * | 2020-06-30 | 2022-09-06 | 国网福建省电力有限公司检修分公司 | Resistive current compensation method for lightning arrester |
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| US5392184A (en) * | 1992-05-20 | 1995-02-21 | Siemens Aktiengesellschaft | Method and apparatus for relieving a capacitor of a controlled series compensator as a function of the load on its arrester |
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