CN107167698B - Lightning arrester leakage current live-line test device and method - Google Patents
Lightning arrester leakage current live-line test device and method Download PDFInfo
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- CN107167698B CN107167698B CN201710594543.4A CN201710594543A CN107167698B CN 107167698 B CN107167698 B CN 107167698B CN 201710594543 A CN201710594543 A CN 201710594543A CN 107167698 B CN107167698 B CN 107167698B
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- lightning arrester
- leakage current
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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
Abstract
The application relates to the technical field of electrical measurement, in particular to an arrester leakage current live-line test device and method. In the prior art, when the leakage current of the lightning arrester is tested in a live state, the leakage current obtained by the testing device has larger error due to the existence of the surface leakage current of the lightning arrester and the induction current of the lightning arrester base, and the accuracy of the measured data is influenced. The application provides an electrified testing arrangement of arrester leakage current, including arrester leakage current test unit, arrester leakage current test unit is connected with difference calculation unit electricity, difference calculation unit is connected with arrester base analog unit electricity. The surface leakage current and the base induction current of the lightning arrester are removed after the full current, the surface leakage current of the lightning arrester and the base induction current of the lightning arrester pass through the differential calculation unit, namely, the interference value is removed, so that the testing device can obtain more accurate data. The application also relates to a method for testing the leakage current of the lightning arrester in an electrified manner.
Description
Technical Field
The application relates to the technical field of electrical measurement, in particular to an arrester leakage current live-line test device and method.
Background
The lightning arrester is used for protecting electrical equipment from being damaged by high transient overvoltage during lightning stroke, limits follow current time and is an electrical appliance for limiting follow current amplitude. Lightning arresters are sometimes also referred to as overvoltage protectors, overvoltage limiters. When the voltage of the power grid rises to the induction voltage of the lightning arrester, the lightning arrester is started to release the overvoltage load, and the amplitude of the rise of the voltage of the power grid is limited to a certain level, so that the insulation of the power equipment is not damaged. Preventive test protocols require: the measurement is carried out once in the later half year of new operation of 35kV and above, and is carried out 1 time before thunderstorm season every year after one year of operation, and the test is required to pay attention to the influence of space electromagnetic field interference.
In the live test process of the leakage current of the field arrester, the measured leakage current comprises three components: full current, surface leakage current of the lightning arrester and base induction current of the lightning arrester. In the three components, the total current is a value to be measured, and the surface leakage current and the base induction current of the lightning arrester are interference values. In order to eliminate the influence of the two interference values, the two interference values are extracted separately and then removed by the measured leakage current, thereby eliminating the influence of the interference.
In the prior art, when the leakage current of the lightning arrester is tested in a live state, the leakage current obtained by the testing device has larger error due to the existence of the surface leakage current of the lightning arrester and the induction current of the lightning arrester base, and the accuracy of the measured data is influenced.
Disclosure of Invention
The invention aims to solve the problem that in the prior art, when the leakage current of the lightning arrester is tested in a live state, the leakage current obtained by a testing device has a large error due to the existence of the surface leakage current of the lightning arrester and the induced current of a base of the lightning arrester, and the accuracy of measured data is influenced.
Therefore, the embodiment of the invention provides the following technical scheme: the lightning arrester leakage current live-line testing device comprises a lightning arrester leakage current testing unit, wherein the lightning arrester leakage current testing unit is electrically connected with a differential calculating unit, and the differential calculating unit is electrically connected with a lightning arrester base simulating unit.
Optionally, the arrester base simulation unit includes a discharge counting module, an arrester base module, and an operation rod module, the difference calculation unit is electrically connected to the discharge counting module, the discharge counting module is electrically connected to the arrester base module, and the operation rod module is disposed below the arrester base module.
Optionally, the arrester leakage current testing unit and the differential calculating unit are electrically connected through a shielded wire.
Optionally, the differential calculation unit is electrically connected with the discharge counting module through a shielding wire; and the discharge counting module is electrically connected with the lightning arrester base module through a lightning arrester grounding down lead.
Optionally, the arrester base module comprises a detachable arrester base, and the operating rod module comprises a telescopic insulating operating rod.
Optionally, the telescopic insulating operating rod top comprises a screw structure, and the screw structure is in threaded connection with the lightning arrester base module.
Optionally, the method comprises the steps of: respectively clamping the tail part of the tested lightning arrester, the grounding down lead of the tested lightning arrester and the grounding down lead of the base unit of the simulation lightning arrester by using a clamp-on ammeter to measure currents I1、I2And I3；I1、I2And I3The signal is transmitted to a differential computing unit through a shielded wire and then output I0。
Optionally, the I1、I2、I3And I0The calculation formula of (2) is as follows:
I0＝I1-I2-I3。
optionally, the output current of the differential computing unit is connected to the current input terminal of the lightning arrester leakage current testing unit through a shielding wire, and the voltage signal of the secondary terminal of the CVT is connected to the voltage input terminal of the lightning arrester leakage current testing unit through the shielding wire.
The technical scheme provided by the embodiment of the invention has the following beneficial effects: according to the lightning arrester testing device, the differential calculation unit is respectively and electrically connected with the tail part of the lightning arrester, the grounding down lead of the tested lightning arrester and the lightning arrester base simulation unit, so that the surface leakage current of the lightning arrester and the induction current of the lightning arrester base are removed after the full current, the surface leakage current of the lightning arrester and the induction current of the lightning arrester base are subjected to the differential calculation unit, namely, an interference value is removed, and the testing device can obtain accurate data.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings needed to be used in the embodiment 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 any creative effort.
Fig. 1 is a schematic structural diagram of an arrester leakage current live test device in an embodiment of the invention;
the symbols in fig. 1 are represented as:
the lightning arrester grounding down-lead testing method comprises the following steps of 1-a lightning arrester leakage current testing unit, 2-a differential calculation unit, 3-a lightning arrester base simulation unit, 4-a discharge counting module, 5-a lightning arrester base module, 6-an operating rod module, 7-a shielding wire and 8-a lightning arrester grounding down-lead.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
The technical solution of the present application is further specifically described below by way of examples and with reference to the accompanying drawings.
Example one
Referring to fig. 1, the lightning arrester leakage current live test device provided for the embodiment of the invention includes a lightning arrester leakage current test unit 1, the lightning arrester leakage current test unit 1 is electrically connected with a difference calculation unit 2, and the difference calculation unit 2 is electrically connected with a lightning arrester base simulation unit 3.
The lightning arrester base simulation unit 3 can simulate the induced current caused by the electromagnetic induction on the tested lightning arrester base.
The specific working process of the invention is as follows: the device is connected with the lightning arrester to be tested after being connected, the lightning arrester base simulation unit 3 which is adaptive to the voltage grade of the lightning arrester to be tested is used, then measurement is carried out, and a result is output.
Example two
Referring to fig. 1, the lightning arrester leakage current live test device provided for the embodiment of the invention includes a lightning arrester leakage current test unit 1, the lightning arrester leakage current test unit 1 is electrically connected with a difference calculation unit 2, and the difference calculation unit 2 is electrically connected with a lightning arrester base simulation unit 3.
Optionally, the arrester base simulation unit 3 includes a discharge counting module 4, an arrester base module 5 and an operation rod module 6, the difference calculation unit 2 is electrically connected to the discharge counting module 4, the discharge counting module 4 is electrically connected to the arrester base module 5, and the operation rod module 6 is disposed below the arrester base module 5.
The lightning arrester base simulation unit 3 can simulate the induced current caused by the electromagnetic induction on the tested lightning arrester base. This arrester base module 5 includes a series of base modules under various voltage classes, and each voltage class corresponds a base module with the corresponding size of this voltage class, when measuring concrete arrester, selects the arrester base module 5 corresponding with the arrester according to the voltage class of arrester, convenient to use. This action bars module 6 height can be adjusted, adjusts the position that the position of arrester base module 5 was controlled to the height of action bars module 6 for arrester base module 5 is in same height with the arrester base that awaits measuring.
The specific working process of the invention is as follows: the device is characterized in that an operating rod unit 6 is fixed at the position about 1 m beside the tested lightning arrester, the height of the operating rod unit 6 is adjusted to enable a lightning arrester base module 5 and the tested lightning arrester base to be kept at the same height, the device is connected with the tested lightning arrester after being connected, a lightning arrester base simulation unit 3 which is adaptive to the voltage grade of the tested lightning arrester is selected, then measurement is carried out, and a result is output.
EXAMPLE III
Referring to fig. 1, the lightning arrester leakage current live test device provided for the embodiment of the invention includes a lightning arrester leakage current test unit 1, the lightning arrester leakage current test unit 1 is electrically connected with a difference calculation unit 2, and the difference calculation unit 2 is electrically connected with a lightning arrester base simulation unit 3.
Optionally, the arrester base simulation unit 3 includes a discharge counting module 4, an arrester base module 5 and an operation rod module 6, the difference calculation unit 2 is electrically connected to the discharge counting module 4, the discharge counting module 4 is electrically connected to the arrester base module 5, and the operation rod module 6 is disposed below the arrester base module 5.
Optionally, the arrester leakage current testing unit 1 and the difference calculating unit 2 are electrically connected through a shielding wire 7.
Optionally, the difference calculating unit 2 is electrically connected with the discharge counting module 4 through a shielding wire 7; the discharge counting module 4 is electrically connected with the lightning arrester base module 5 through a lightning arrester grounding down lead 8.
Optionally, the arrester base module 5 comprises a detachable arrester base, and the operating rod module 6 comprises a telescopic insulating operating rod.
Optionally, the top of the telescopic insulating operating rod comprises a screw structure, and the screw structure is in threaded connection with the lightning arrester base module 5.
The lightning arrester base simulation unit 3 can simulate the induced current caused by the electromagnetic induction on the tested lightning arrester base. This arrester base module 5 includes a series of base modules under various voltage classes, and each voltage class corresponds a base module with the corresponding size of this voltage class, when measuring concrete arrester, selects the arrester base module 5 corresponding with the arrester according to the voltage class of arrester, convenient to use. This action bars module 6 height can be adjusted, adjusts the position that the position of arrester base module 5 was controlled to the height of action bars module 6 for arrester base module 5 is in same height with the arrester base that awaits measuring. The lightning arrester grounding down lead 8 is connected with the lightning arrester base module 5 and is grounded through the discharge counting module 4, and the lightning arrester base module 5 is detachable and is movably connected with the operating rod module 6. Because the operating rod module 6 is a telescopic insulating operating rod, the height of the lightning arrester base module 5 can be adjusted by telescoping.
The specific working process of the invention is as follows: the operating rod unit 6 is fixed at the position of about 1 meter beside the tested lightning arrester, because the operating rod unit 6 is in threaded connection with the lightning arrester base module 5, the height of the operating rod unit 6 is adjusted to enable the lightning arrester base module 5 and the tested lightning arrester base to be kept at the same height, the device is connected with the tested lightning arrester after being connected, the lightning arrester base simulation unit 3 adaptive to the voltage grade of the tested lightning arrester is selected, then measurement is carried out, and a result is output.
Example four
An arrester leakage current live test method, comprising the steps of: respectively clamping the tail part of the tested lightning arrester, the grounding down lead of the tested lightning arrester and the grounding down lead of the base unit of the simulation lightning arrester by using a clamp-on ammeter to measure currents I1、I2And I3；I1、I2And I3The signal is transmitted to a differential computing unit through a shielded wire and then output I0。
Optionally, the I1、I2、I3And I0The calculation formula of (2) is as follows: i is0＝I1-I2-I3。
Optionally, the output current of the differential computing unit is connected to the current input terminal of the lightning arrester leakage current testing unit through a shielding wire, and the voltage signal of the secondary terminal of the CVT is connected to the voltage input terminal of the lightning arrester leakage current testing unit through the shielding wire.
The operating rod unit 6 is fixed at the position of about 1 meter beside the tested lightning arrester, because the operating rod unit 6 is in threaded connection with the lightning arrester base module 5, the height of the operating rod unit 6 is adjusted to enable the lightning arrester base module 5 to be kept at the same height with the tested lightning arrester base, the device is connected with the tested lightning arrester after being connected, the lightning arrester base simulation unit 3 adaptive to the voltage grade of the tested lightning arrester is selected, the lightning arrester grounding down lead 8 is connected with the lightning arrester base module 5, and the lightning arrester grounding down lead is grounded through the discharge counting module 4. Three high-precision clamp-on ammeters are used for respectively clamping the tail part of the lightning arrester to be tested and connecting the lightning arrester to be testedMeasuring the total current, the surface leakage current of the lightning arrester and the induction current of the lightning arrester base on the ground down conductor of the device of the simulation lightning arrester base unit 3, and respectively marking as I1、I2And I3The three currents are transmitted to the differential calculation unit 2 through the shielded conductor 7; the output end of the differential calculation unit 2 is connected to the current input end of the lightning arrester leakage current test unit 1 through a shielding wire 7; the voltage signal of the secondary terminal of the CVT is connected to the voltage input end of the lightning arrester leakage current test unit 1 through a shielded wire 7.
The foregoing is merely a detailed description of embodiments of the invention that will enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It will be understood that the present application is not limited to what has been described above and shown in the accompanying drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (8)
1. The lightning arrester leakage current live test device is characterized by comprising a lightning arrester leakage current test unit, wherein the lightning arrester leakage current test unit is electrically connected with a differential calculation unit, and the differential calculation unit is electrically connected with a lightning arrester base simulation unit; the lightning arrester base simulation unit comprises a discharge counting module, a lightning arrester base module and an operating rod module, the difference calculating unit is electrically connected with the discharge counting module, the discharge counting module is electrically connected with the lightning arrester base module, and the operating rod module is arranged below the lightning arrester base module;
the lightning arrester base simulation unit is used for simulating induced current caused by electromagnetic induction on the tested lightning arrester base;
the differential calculation unit is used for measuring the full current of the tested lightning arrester, the surface leakage current of the tested lightning arrester and the lightning arrester base induction current simulated by the lightning arrester base simulation unit;
the lightning arrester leakage current testing unit is used for determining the leakage current of the tested lightning arrester according to the total current of the tested lightning arrester, the surface leakage current of the tested lightning arrester and the lightning arrester base induction current measured by the differential calculation unit.
2. The apparatus of claim 1, wherein the arrester leakage current test unit and the differential calculation unit are electrically connected through a shielded wire.
3. The apparatus of claim 1, wherein the differential calculation unit is electrically connected to the discharge count module by a shielded wire; and the discharge counting module is electrically connected with the lightning arrester base module through a lightning arrester grounding down lead.
4. The apparatus of claim 3, wherein the arrester base module comprises a removable arrester base and the operating rod module comprises a telescoping insulated operating rod.
5. The apparatus of claim 4, wherein the telescoping dielectric operating rod top portion includes a screw structure that is threadably connected with the arrester base module.
6. An arrester leakage current live test method, which is applied to the arrester leakage current live test apparatus according to any one of claims 1 to 5, the apparatus including an arrester leakage current test unit electrically connected to a differential calculation unit electrically connected to an arrester base simulation unit; the method comprises the following steps:
respectively clamping the tail part of the tested lightning arrester, the grounding down lead of the tested lightning arrester and the grounding down lead of the base unit of the simulation lightning arrester by using a clamp-on ammeter to measure currents I1、I2And I3；I1、I2And I3The signal is transmitted to a differential computing unit through a shielded wire and then output I0。
7. The method of claim 6, wherein I is1、I2、I3And I0The calculation formula of (2) is as follows: i is0＝I1-I2-I3。
8. The method according to any one of claims 6 to 7, wherein the output current of the differential calculation unit is connected to a current input terminal of the lightning arrester leakage current test unit through a shielded wire, and the CVT secondary terminal voltage signal is connected to a voltage input terminal of the lightning arrester leakage current test unit through the shielded wire.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710594543.4A CN107167698B (en) | 2017-07-20 | 2017-07-20 | Lightning arrester leakage current live-line test device and method |
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| CN201710594543.4A CN107167698B (en) | 2017-07-20 | 2017-07-20 | Lightning arrester leakage current live-line test device and method |
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| CN107167698B true CN107167698B (en) | 2020-02-07 |
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| CN109959848B (en) * | 2019-03-13 | 2021-07-27 | 国网安徽省电力有限公司芜湖供电公司 | Electrical element compression test platform and test method |
| CN113156332A (en) * | 2021-04-08 | 2021-07-23 | 国网浙江省电力有限公司开化县供电公司 | Pole-climbing-free leakage checking and shunting device |
| CN113534007A (en) * | 2021-07-28 | 2021-10-22 | 广东电网有限责任公司 | Lightning arrester leakage current monitoring method and system |
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| CN102901894A (en) * | 2012-09-29 | 2013-01-30 | 辽宁省电力有限公司检修分公司 | Test method and device for testing 500kV zinc oxide arrester |
| CN203101482U (en) * | 2013-01-11 | 2013-07-31 | 四川电力科学研究院 | Metallic oxide arrester leakage current detection device and system |
| CN203224580U (en) * | 2013-04-05 | 2013-10-02 | 国家电网公司 | An apparatus for zinc oxide lightning arrester energized testing |
| CN204065294U (en) * | 2014-10-11 | 2014-12-31 | 国家电网公司 | With the lightning arrester line monitor signal harvester of function of shielding |
| CN106249098A (en) * | 2016-08-24 | 2016-12-21 | 广东电网有限责任公司惠州供电局 | Testing device for current leakage and method of testing is saved on high-voltage arrester |
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2017
- 2017-07-20 CN CN201710594543.4A patent/CN107167698B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102901894A (en) * | 2012-09-29 | 2013-01-30 | 辽宁省电力有限公司检修分公司 | Test method and device for testing 500kV zinc oxide arrester |
| CN203101482U (en) * | 2013-01-11 | 2013-07-31 | 四川电力科学研究院 | Metallic oxide arrester leakage current detection device and system |
| CN203224580U (en) * | 2013-04-05 | 2013-10-02 | 国家电网公司 | An apparatus for zinc oxide lightning arrester energized testing |
| CN204065294U (en) * | 2014-10-11 | 2014-12-31 | 国家电网公司 | With the lightning arrester line monitor signal harvester of function of shielding |
| CN106249098A (en) * | 2016-08-24 | 2016-12-21 | 广东电网有限责任公司惠州供电局 | Testing device for current leakage and method of testing is saved on high-voltage arrester |
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