CN112305348A - Method for quickly testing resistive current of reconstructed MOA (metal oxide arrester) by considering in-phase capacitive equipment - Google Patents
Method for quickly testing resistive current of reconstructed MOA (metal oxide arrester) by considering in-phase capacitive equipment Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims description 34
- 229910044991 metal oxide Inorganic materials 0.000 title description 3
- 150000004706 metal oxides Chemical class 0.000 title description 3
- 230000003449 preventive effect Effects 0.000 claims abstract description 14
- 238000010998 test method Methods 0.000 claims abstract description 7
- 239000004020 conductor Substances 0.000 claims abstract 12
- 239000003990 capacitor Substances 0.000 claims description 22
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 38
- 239000011787 zinc oxide Substances 0.000 description 19
- 238000010586 diagram Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 8
- 238000000605 extraction Methods 0.000 description 7
- 238000012937 correction Methods 0.000 description 3
- 239000013264 metal-organic assembly Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 206010073131 oligoastrocytoma Diseases 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
- G01R31/003—Environmental or reliability tests
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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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1236—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of surge arresters
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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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
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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Abstract
本发明涉及一种考虑同相电容型设备重构MOA阻性电流快速测试方法，包括以下步骤：测量避雷器接地引下线的泄露电流Ix；测量与避雷器连在同一个高压管母上的同相电容型设备接地引下线的泄露电流Ii；同步接收所述泄露电流Ix和泄露电流Ii；比较得出所述泄露电流Ix和泄露电流Ii之间的时间差Δt，并通过所述时间差计算为相角差φ，公式为
The invention relates to a fast test method for reconstructing MOA resistive current considering in-phase capacitive equipment, comprising the following steps: measuring the leakage current Ix of the grounding down-conductor of the arrester; The leakage current Ii of the grounding down-conductor; the leakage current Ix and the leakage current Ii are received simultaneously; the time difference Δt between the leakage current Ix and the leakage current Ii is obtained by comparison, and the time difference is calculated as the phase angle difference φ , the formula is
Description
Technical Field
The application relates to the technical field of power grid operation safety, in particular to a method for quickly testing resistive current by considering reconstruction of an MOA (metal oxide arrester) of in-phase capacitive equipment.
Background
Zinc oxide arresters (MOAs) are among the important power protection devices in power systems, primarily to protect other power devices from lightning overvoltages and operational overvoltages. However, the zinc oxide arrester is affected by overvoltage and environmental factors under long-term working conditions, so that the electrical performance of the zinc oxide arrester is degraded or aged, and the safe operation of the zinc oxide arrester and the protective power equipment thereof is seriously threatened. The deterioration or aging degree of the zinc oxide arrester can be judged by detecting the variation trend of the resistive current component of the zinc oxide arrester.
The existing commonly used resistive current extraction method is to acquire a voltage signal from an electromagnetic voltage transformer (PT) or a Capacitance Voltage Transformer (CVT) of a loop of a tested arrester, acquire a leakage current signal of the zinc oxide arrester, synchronously sample the voltage signal and the current signal, and calculate the resistive current of the zinc oxide arrester by resistive current extraction algorithm software. The traditional method can extract the resistive current of the zinc oxide arrester under the condition that the arrester is electrified, so as to further analyze the insulation condition of the zinc oxide arrester and judge whether the zinc oxide arrester can continuously operate in a system to protect power equipment.
The acquisition of the power grid voltage at home and abroad is promoted all the time, the traditional mode is that a power grid voltage signal is acquired from a secondary side, and the traditional method can measure the power grid voltage under the condition of electrification. However, when a voltage signal is acquired at the secondary side of the voltage transformer, short circuit of the secondary side of the transformer can be caused due to misoperation and the like, and a relay protection device or an electric energy metering device is further connected to the secondary side, so that misoperation of a power grid protection device can be caused, and accidents such as power grid outage and the like or reduction of electric energy transmission stability can be caused; or cause voltage metering errors, resulting in inaccurate power metering. Therefore, the safe and efficient extraction of the power grid voltage has a high economic value.
For the phenomenon, the existing measurement mode adopts an external non-contact voltage induction plate mode, the mode of obtaining the power grid voltage only through an induction plate cannot avoid space electromagnetic field interference and interphase interference, and large errors exist in the actual operation of a field. Another method for acquiring the voltage of the power grid is to take the voltage of a station transformer (maintenance power supply) instead of the secondary signal of the voltage transformer, and because the low-voltage alternating-current voltage signal and the operating voltage signal have a phase angle difference through a winding of the station transformer, the low-voltage alternating-current voltage signal cannot play a role in offsetting a capacitive current component. When the voltage level is high enough, there is no need to consider the dielectric loss of the capacitive device itself for capacitive device I _ C > I _ R. When the voltage level is gradually decreased, the capacitance of part of the capacitive devices is not enough to satisfy the condition of I _ C > I _ R, and it is significant to consider the phase correction.
Therefore, it is a main problem to be solved at present to provide a method for measuring resistive current without measuring system voltage signals in the arrester loop.
Disclosure of Invention
The application provides a method for quickly testing the reconstructed MOA resistive current by considering in-phase capacitive equipment, which aims to solve the problem that the resistive current of a zinc oxide arrester is difficult to calculate due to the limitation of the traditional voltage transformer type voltage measurement method.
The technical scheme adopted by the application is as follows:
the invention provides a method for quickly testing a reconstructed MOA resistive current by considering in-phase capacitive equipment, which is characterized by comprising the following steps of:
measuring the leakage current Ix of the lightning arrester grounding down lead;
measuring the leakage current Ii of an in-phase capacitive equipment grounding down lead connected with the lightning arrester on the same high-voltage bus;
synchronously receiving the leakage current Ix and the leakage current Ii;
comparing to obtain the time difference delta t between the leakage current Ix and the leakage current Ii, and calculating the time difference to be the phase angle difference phi according to the formula
Inquiring a tangent value b of a dielectric loss angle measured in the last preventive test of the in-phase capacitive equipment, and solving the dielectric loss angle sigma of the in-phase capacitive equipment, wherein the formula is as follows: σ ═ arctan (b);
solving the equivalent dielectric loss angle theta of the lightning arrester,
and obtaining the resistive current Ir of the lightning arrester according to the equivalent dielectric loss angle theta, wherein the formula is Ir ═ iX multiplied by sin theta.
Further, the synchronously receiving the leakage current Ix and Ii further includes:
and synchronously receiving the leakage current Ix and the leakage current Ii through an oscilloscope.
Further, the comparison yields a time difference Δ t between the leakage current Ix and Ii, and the time difference is calculated as a phase angle difference Φ, which is expressed as
Further comprising:
the time difference delta t between two waveforms of the leakage current Ix and the leakage current Ii is obtained through comparison of an oscilloscope, and is calculated as the phase angle difference phi through the time difference, and the formula is
Further, if the in-phase capacitive device is an in-phase capacitor, the method for quickly testing the resistive current of the reconstructed MOA comprises the following steps:
measuring the leakage current Ix of the lightning arrester grounding down lead;
measuring the leakage current Ic of an in-phase capacitor grounding down lead connected with the lightning arrester on the same high-voltage busbar;
synchronously receiving the leakage current Ix and the leakage current Ic through an oscilloscope;
the time difference delta t between two waveforms of the leakage current Ix and the leakage current Ic is obtained through comparison of an oscilloscope, and is calculated as a phase angle difference phi through the time difference, wherein the formula is
Inquiring a tangent value b of a dielectric loss angle measured in the last preventive test of the in-phase capacitor, and solving the dielectric loss angle sigma of the in-phase capacitive equipment, wherein the formula is as follows: σ ═ arctan (b);
solving the equivalent dielectric loss angle theta of the lightning arrester,
and obtaining the resistive current Ir of the lightning arrester according to the equivalent dielectric loss angle theta, wherein the formula is Ir ═ iX multiplied by sin theta.
Further, if the in-phase capacitive device is an in-phase current transformer, the method for quickly testing the reconstructed MOA resistive current comprises the following steps:
measuring the leakage current Ix of the lightning arrester grounding down lead;
measuring leakage current I of in-phase current transformer grounding down lead connected with lightning arrester on same high-voltage tube busTA；
Synchronously receiving the leakage current Ix and the leakage current I through an oscilloscopeTA；
Comparing by an oscilloscope to obtain leakage current Ix and leakage current ITAThe time difference delta t between the two waveforms is calculated as the phase angle difference phi through the time difference, and the formula is
Inquiring a tangent value b of a dielectric loss angle measured in a last preventive test of the in-phase current transformer, and solving the dielectric loss angle sigma of the in-phase capacitive equipment, wherein the formula is as follows: σ ═ arctan (b);
solving the equivalent dielectric loss angle theta of the lightning arrester,
and obtaining the resistive current Ir of the lightning arrester according to the equivalent dielectric loss angle theta, wherein the formula is Ir ═ iX multiplied by sin theta.
Further, if the in-phase capacitive equipment is an in-phase main transformer high-voltage bushing end screen, the method for quickly testing the reconstructed MOA resistive current comprises the following steps:
measuring the leakage current Ix of the lightning arrester grounding down lead;
measuring leakage current I of end screen grounding down lead of in-phase main transformer high-voltage bushing connected with lightning arrester on same high-voltage busbarT；
Synchronously receiving the leakage current Ix and the leakage current I through an oscilloscopeT；
Comparing the leakage current Ix and the leakage current by an oscilloscope to obtain the leakage current Ix and the leakage currentITThe time difference delta t between the two waveforms is calculated as the phase angle difference phi through the time difference, and the formula is
Inquiring a tangent value b of a dielectric loss angle measured in the last preventive test of the end screen of the in-phase main transformer high-voltage bushing, and solving the dielectric loss angle sigma of the in-phase capacitive equipment, wherein the formula is as follows: σ ═ arctan (b);
solving the equivalent dielectric loss angle theta of the lightning arrester,
and obtaining the resistive current Ir of the lightning arrester according to the equivalent dielectric loss angle theta, wherein the formula is Ir ═ iX multiplied by sin theta.
The technical scheme of the application has the following beneficial effects:
the method for quickly testing the reconstructed MOA resistive current by considering the in-phase capacitive equipment overcomes the limitation of the traditional voltage transformer type voltage measurement method, provides a capacitive equipment parallel model for correcting the voltage measurement phase angle error, corrects the phase difference when the voltage is reconstructed by the leakage current of the capacitive equipment, and improves the extraction accuracy of the MOA resistive current.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is an equivalent circuit diagram of a capacitor;
FIG. 2 is a schematic diagram showing the phase relationship between an in-phase capacitive device and the resistive current of the MOA;
FIG. 3 is a connection relation diagram of equipment in a MOA resistive current rapid test method considering in-phase capacitor reconstruction;
FIG. 4 is a flow chart of a method for rapidly testing resistive current of a reconstructed MOA in consideration of an in-phase capacitor;
FIG. 5 is a device connection relation diagram in a MOA resistive current rapid test method for reconstructing considering in-phase current transformers;
FIG. 6 is a flow chart of a method for rapidly testing the reconstructed MOA resistive current in consideration of an in-phase current transformer;
FIG. 7 is a device connection relation diagram in a MOA resistive current rapid test method considering reconstruction of an end screen of a high-voltage bushing of an in-phase main transformer;
FIG. 8 is a flow chart of a method for rapidly testing the reconstructed MOA resistive current in consideration of an in-phase current transformer;
illustration of the drawings:
wherein, 1-high pressure pipe bus; 2-a lightning arrester to be tested; 3-in-phase capacitive devices;
31-an in-phase capacitor; 32-in-phase current transformer; 33-in-phase main transformer high-voltage bushing end screen;
4-a first current sensor; 5-a second current sensor;
6-oscilloscope.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
The application aims to provide a voltage reconstruction MOA resistive current rapid test method considering in-phase capacitive equipment leakage current phase correction, which can completely overcome the defects of safety and stability brought by the traditional voltage transformer when obtaining the voltage of a power grid, and simultaneously avoid the precision problems of other measurement modes. In addition, the measurement precision of the power grid voltage under the charged on-line monitoring can be improved by continuously correcting the dielectric loss angle and the model parameters of the capacitive equipment, and the information of the resistive current of the zinc oxide arrester can be conveniently obtained. The invention is an MOA resistive current measuring method (dielectric loss angle correction) based on leakage current reconstruction voltage of capacitive equipment (sleeve, CT and the like), has high accuracy, corrects the leakage current of the capacitive equipment through the information of the dielectric loss angle and the capacitance of the capacitive equipment, and further improves the voltage measuring precision of a power grid, thereby improving the MOA resistive current measuring precision.
In the MOA resistive current extraction process, the conventional power grid voltage acquisition method has limitation, and the MOA resistive current is further deduced by a method for reconstructing the power grid voltage through the leakage current of the capacitive equipment.
The application provides a method for quickly testing the reconstructed MOA resistive current by considering in-phase capacitive equipment, which comprises the following steps:
measuring leakage current Ix of a lightning arrester grounding down lead through a first current sensor;
measuring the leakage current Ii of an in-phase capacitive equipment grounding down lead connected with the lightning arrester on the same high-voltage bus through a second current sensor;
synchronously receiving the leakage current Ix and the leakage current Ii;
comparing to obtain the time difference delta t between the leakage current Ix and the leakage current Ii, and calculating the time difference to be the phase angle difference phi according to the formula
Inquiring a tangent value b of a dielectric loss angle measured in the last preventive test of the in-phase capacitive equipment, and solving the dielectric loss angle sigma of the in-phase capacitive equipment, wherein the formula is as follows: σ ═ arctan (b);
solving the equivalent dielectric loss angle theta of the lightning arrester,
and obtaining the resistive current Ir of the lightning arrester according to the equivalent dielectric loss angle theta, wherein the formula is Ir ═ iX multiplied by sin theta.
The synchronous reception of the leakage current Ix and Ii further comprises: and synchronously receiving the leakage current Ix and the leakage current Ii through an oscilloscope.
Said comparison yields said leakage currents Ix andthe time difference delta t between the leakage currents Ii is calculated as the phase angle difference phi through the time difference, and the formula is
Further comprising:
the time difference delta t between two waveforms of the leakage current Ix and the leakage current Ii is obtained through comparison of an oscilloscope, and is calculated as the phase angle difference phi through the time difference, and the formula is
The MOA resistive current measuring method taking the leakage current reconstruction voltage of the capacitive equipment as the reference is used for carrying out online and electrified monitoring on the MOA in the power grid, analyzing the characteristics of aging, damping and the like of the MOA, and preventing accidents.
By adopting the voltage reconstruction form based on the leakage current of the capacitive equipment, the factors that the action of the protection device is easily caused when the voltage transformer extracts the voltage of the power grid can be avoided, and the safety and the stability of measurement are improved. The device can calculate the resistive current by measuring the capacitive current and the leakage current of the zinc oxide arrester.
The successful implementation of the invention can realize the rapid acquisition of the resistive current of the zinc oxide arrester in the power grid, the operation is simple and safe, the invention can provide reliable guarantee for the performance evaluation of the zinc oxide arrester, the safety of the power equipment and the like, and provide technical support for the safe and reliable operation and the modification decision of the power system, and the invention is embodied in the following aspects:
(1) the novel device does not need to help other complicated equipment when voltage measurement and MOA resistive current extraction are carried out. And does not cause the protector to act
(2) The measurement cost is reduced, and large-scale application can be realized. The measuring method is optimized, and the adopted devices and devices are relatively cheap, so that the large-scale application can be realized.
(3) The method is wide in application range, and can be applied to occasions where the power system mostly needs to carry out charged detection on the acquired system voltage, such as zinc oxide arrester resistive current acquisition, power grid voltage harmonic analysis and the like.
Specifically, the present invention further includes a high-voltage side bus voltage U of the capacitor which can be pushed back by the resistive current of the lightning arrester, the equivalent circuit diagram of the capacitor is shown in fig. 1, (a) in fig. 1 is an equivalent circuit diagram, fig. 1 (b) is a vector diagram, and fig. 2 is a schematic diagram of the phase relationship between the in-phase capacitive device and the MOA resistive current. The capacitor can be equivalent to a device consisting of a capacitor and a resistor, C and R in the figure are respectively a parallel capacitor and a parallel resistor of an equivalent circuit, the current I flowing through the in-phase capacitive device consists of a capacitance current component Ic and a resistance current component Ir, and sigma is a dielectric loss angle. The high-voltage side bus voltage U of the capacitor can be inverted on the premise of the known leakage current I flowing through the in-phase capacitor and the known dielectric loss angle.
As shown in FIG. 2, Ic is the leakage current of the capacitive device, IcRFor resistive current of capacitive devices, capacitive devices IC＞＞IcR,. The tangent value tan delta of the dielectric loss angle of 110 kV-500 kV capacitive equipment in operation is not more than 0.8% -1.0% and (tan delta)2< 1. The following can be obtained:
in the extraction of the resistive current of the zinc oxide arrester, the power grid voltage U only provides phase information, and the measurement precision of the MOA resistive current is not influenced. As shown in the above figure IMOAIs MOA full current, IMOARFor MOA resistive current, obtaining U' by integrating leakage current Ic of capacitive equipment, calculating delta c (or obtained from preventive test) by combining equivalent loop parameters in figure 2, and measuring to obtain total current I of zinc oxide arresterMOAThen the MOA resistive current Ic can be calculatedR。
U′＝∫Icdt
U＝U′∠δ
IMOAR＝IMOAcosδxMOA
Example one
Fig. 1 is a connection diagram of devices in the method for quickly testing resistive current of an MOA by considering reconstruction of an in-phase capacitor according to the present embodiment, and fig. 2 is a flowchart of the present embodiment.
In this embodiment, if the in-phase capacitive device is an in-phase capacitor, the method for quickly testing the reconstructed MOA resistive current includes the following steps:
measuring leakage current Ix of a lightning arrester grounding down lead through a first current sensor;
measuring the leakage current Ic of the in-phase capacitor grounding down lead connected with the lightning arrester on the same high-voltage tube bus through a second current sensor;
synchronously receiving the leakage current Ix and the leakage current Ic through an oscilloscope;
the time difference delta t between two waveforms of the leakage current Ix and the leakage current Ic is obtained through comparison of an oscilloscope, and is calculated as a phase angle difference phi through the time difference, wherein the formula is
Inquiring a tangent value b of a dielectric loss angle measured in the last preventive test of the in-phase capacitor, and solving the dielectric loss angle sigma of the in-phase capacitive equipment, wherein the formula is as follows: σ ═ arctan (b);
solving the equivalent dielectric loss angle theta of the lightning arrester,
and obtaining the resistive current Ir of the lightning arrester according to the equivalent dielectric loss angle theta, wherein the formula is Ir ═ iX multiplied by sin theta.
Example two
Different from the first embodiment, if the in-phase capacitive device in the present embodiment is an in-phase current transformer, the method for quickly testing the reconstructed MOA resistive current includes the following steps:
measuring leakage current Ix of a lightning arrester grounding down lead through a first current sensor;
measuring earthing down-lead of in-phase current transformer connected with lightning arrester on same high-voltage tube bus by second current sensorLeakage current ITA；
Synchronously receiving the leakage current Ix and the leakage current I through an oscilloscopeTA；
Comparing by an oscilloscope to obtain leakage current Ix and leakage current ITAThe time difference delta t between the two waveforms is calculated as the phase angle difference phi through the time difference, and the formula is
Inquiring a tangent value b of a dielectric loss angle measured in a last preventive test of the in-phase current transformer, and solving the dielectric loss angle sigma of the in-phase capacitive equipment, wherein the formula is as follows: σ ═ arctan (b);
solving the equivalent dielectric loss angle theta of the lightning arrester,
and obtaining the resistive current Ir of the lightning arrester according to the equivalent dielectric loss angle theta, wherein the formula is Ir ═ iX multiplied by sin theta.
EXAMPLE III
Different from the first and second embodiments, in the present embodiment, the in-phase capacitive device is an in-phase main transformer high-voltage bushing end screen, and the reconstructed MOA resistive current fast testing method includes the following steps:
measuring leakage current Ix of a lightning arrester grounding down lead through a first current sensor;
measuring leakage current I of end screen grounding down lead of in-phase main transformer high-voltage bushing connected with lightning arrester on same high-voltage tube bus through second current sensorT；
Synchronously receiving the leakage current Ix and the leakage current I through an oscilloscopeT；
Comparing by an oscilloscope to obtain leakage current Ix and leakage current ITThe time difference delta t between the two waveforms is calculated as the phase angle difference phi through the time difference, and the formula is
Inquiring a tangent value b of a dielectric loss angle measured in the last preventive test of the end screen of the in-phase main transformer high-voltage bushing, and solving the dielectric loss angle sigma of the in-phase capacitive equipment, wherein the formula is as follows: σ ═ arctan (b);
solving the equivalent dielectric loss angle theta of the lightning arrester,
and obtaining the resistive current Ir of the lightning arrester according to the equivalent dielectric loss angle theta, wherein the formula is Ir ═ iX multiplied by sin theta.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002475A (en) * | 2021-10-22 | 2022-02-01 | 深圳抛物线科技有限公司 | Lightning arrester resistive current on-line monitoring method |
| CN115902486A (en) * | 2022-12-08 | 2023-04-04 | 国网福建省电力有限公司安溪县供电公司 | An Optimal Method for Detection of Resistive Current in Live Test of Surge Arrester |
| CN119510994A (en) * | 2024-11-05 | 2025-02-25 | 广东电网有限责任公司 | Online insulation monitoring method, device, electronic device and storage medium for capacitor type equipment |
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