CN111856113A - Non-intrusive measurement method for true leakage current of zinc oxide arrester - Google Patents
Non-intrusive measurement method for true leakage current of zinc oxide arrester Download PDFInfo
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- CN111856113A CN111856113A CN202010588254.5A CN202010588254A CN111856113A CN 111856113 A CN111856113 A CN 111856113A CN 202010588254 A CN202010588254 A CN 202010588254A CN 111856113 A CN111856113 A CN 111856113A
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- arrester
- current
- leakage current
- zinc oxide
- current sensor
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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
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
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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
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/17—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values giving an indication of the number of times this occurs, i.e. multi-channel analysers
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a non-intrusive measuring method for true leakage current of a zinc oxide arrester, which comprises the following steps of: s1, firstly, connecting a high-voltage output end of a direct-current high-voltage generator with the upper part of a tested lightning arrester, then connecting a signal transmission port of the direct-current high-voltage generator with an operation box through a signal wire, and S2, then clamping a pincerlike current sensor at the upper end connecting wire of the tested lightning arrester, and ensuring that a display screen of the pincerlike current sensor is within the visual field range of a tester; according to the invention, by the non-intrusive measuring method of the true leakage current of the zinc oxide arrester based on the electromagnetic induction principle, on the premise of not adding any additional work, the influence of equipment around the tested arrester on the leakage current test can be eliminated by only clamping the clamp-type current sensor at the connecting line on the upper part of the discharge counter, the true leakage current of the tested arrester is obtained, and the control effect on the true insulation state of the arrester is improved.
Description
Technical Field
The invention relates to the technical field of lightning arrester leakage current measurement, in particular to a non-intrusive measurement method for true leakage current of a zinc oxide lightning arrester.
Background
The lightning arrester is one of important protective devices for protecting the safe and stable operation of power equipment, and is mainly used for limiting lightning overvoltage or operation overvoltage and the like. At present, most of lightning arresters used in a power system are metal zinc oxide lightning arresters, and the reliable operation of a power grid is ensured due to the excellent volt-ampere characteristic of the metal zinc oxide lightning arresters. In order to ensure the safe operation of the zinc oxide arrester, it is necessary to perform a power failure routine test according to the test period. According to the requirements of Q/GDW168-2013 'State repair and test regulations of power transmission and transformation equipment', a leakage current test is carried out on the zinc oxide arrester under the direct current 1mA voltage U1mA and the direct current voltage of 0.75 time U1mA, and the test method is an important test project for checking whether the internal valve plate of the zinc oxide arrester is degraded or not. The test field equipment is erected, the electromagnetic environment is complex, the true leakage current of the tested lightning arrester cannot be obtained by the current test method, and testers can easily misjudge the performance of a tested object, so that a measurement method for obtaining the true leakage current of the zinc oxide lightning arrester needs to be researched.
Disclosure of Invention
In order to achieve the purpose, the invention adopts a technical scheme that: the non-intrusive measurement method for the true leakage current of the zinc oxide arrester comprises the following steps: s1, firstly, connecting the high voltage output end of the direct current high voltage generator with the upper part of the lightning arrester to be tested, then connecting the signal transmission port of the direct current high voltage generator with the operation box through a signal wire, and the ground terminal of the operating box and the ground terminal of the direct current high voltage generator are connected to the ground flat iron of the arrester, S2, and then, clamping the pincerlike current sensor at the upper end connecting wire of the tested lightning arrester to ensure that the display screen of the pincerlike current sensor is within the visual field range of the tester, S3, finally, raising the voltage through the operation box, the operator observing the display screen of the pincerlike current sensor, when the current value of the clamp-on current sensor display screen is one thousand microamperes, the voltage value at the moment is recorded, and clicking a 75% U1mA switch of the operation box, and then continuously observing the reading on the display screen of the pincerlike current sensor, namely the true leakage current of the tested lightning arrester.
The pincerlike current sensor further comprises a metal core and a coil winding, the coil winding is wound on the periphery of the metal core, and a lead is inserted into the inner side of the metal core.
The metal core further comprises an opening, the metal core is of an annular structure, and the opening is formed in one side of the metal core.
The clamp-on current sensor further comprises a signal conditioning circuit, a processor and a display screen, wherein the signal conditioning circuit is connected with electrical signals at two ends of the coil winding, the output end of the signal conditioning circuit is connected with the input end of the processor through electrical signals, and the output end of the processor is connected with the input end of the display screen through electrical signals.
The direct-current high-voltage generator is electrically coupled with the ammeter, a signal end of the ammeter is fixedly connected with a high-voltage wire through a bolt, and one end of the high-voltage wire is fixedly connected with the lightning arrester through a bolt.
The lightning arrester is characterized in that two ends of the signal wire are respectively and fixedly connected with the direct-current high-voltage generator and the operation box through bolts, the top end of the grounding flat iron is fixedly connected with a discharge counter through bolts, and the input end of the discharge counter is connected with an electric signal of the lightning arrester.
The lightning arrester is characterized in that the two sides of the middle of the lower surface of the lightning arrester are respectively fixedly connected with an insulating support column through bolts, and the bottom ends of the insulating support columns are respectively fixedly connected with support columns through bolts.
The operation box and the direct-current high-voltage generator are both grounded through a ground wire.
According to the scheme, the non-intrusive measuring method for the true leakage current of the zinc oxide arrester based on the electromagnetic induction principle is adopted, on the premise that no extra work is added, only the clamp type current sensor is clamped at the connecting line on the upper portion of the discharge counter, the influence of peripheral equipment of the tested arrester on the leakage current test can be eliminated, the true leakage current of the tested arrester is obtained, and the control effect on the true insulation state of the arrester is improved.
Drawings
FIG. 1 is a connection diagram of the overall structure of the present invention;
fig. 2 is a schematic diagram of a clamp-on current sensor system of the present invention.
In the figure: 1-a lightning arrester; 2-high voltage line; 3-an ammeter; 4-a direct current high voltage generator; 5-a signal line; 6-operating box; 7-insulating pillars; 8-a support column; 9-grounding flat iron; 10-a discharge counter; 11-a clamp current sensor; 12-a pincer-shaped current sensor display screen; 13-a metal core; 14-an opening; 15-a coil winding; 16-a wire; 17-a signal conditioning circuit; 18-a processor; 19-display screen
Detailed Description
In the following, reference will be made to various embodiments of the invention. However, embodiments may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will fully convey the scope of the invention to those skilled in the art. In other instances, well-known functions or constructions may not be described or shown in detail to avoid obscuring the subject matter of the present disclosure.
In this embodiment, according to fig. 1-2, the following steps are included:
s1, firstly, connecting the high voltage output end of a DC high voltage generator 4 with the upper part of a tested lightning arrester 1, wherein, two sides of the middle part of the lower surface of the lightning arrester 1 are fixedly connected with insulating pillars 7 through bolts, the bottom ends of the two insulating pillars 7 are fixedly connected with supporting pillars 8 through bolts, the DC high voltage generator 4 is electrically coupled with an ammeter 3, the signal end of the ammeter 3 is fixedly connected with a high voltage wire 2 through bolts, one end of the high voltage wire 2 is fixedly connected with the lightning arrester 1 through bolts, then, the signal transmission port of the DC high voltage generator 4 is connected with an operation box 6 through a signal wire 5, the operation box 6 and the DC high voltage generator 4 are grounded through a ground wire, two ends of the signal wire 5 are respectively fixedly connected with the DC high voltage generator 4 and the operation box 6 through bolts, and the grounding end of the operation box 6 and the grounding end of the DC high voltage generator 4 are connected with the grounding flat iron 9 of the lightning, the top end of the grounding flat iron 9 is fixedly connected with a discharge counter 10 through a bolt, and the input end of the discharge counter 10 is in electrical signal connection with the lightning arrester 1;
s2, clamping the pincerlike current sensor 11 at the upper end connecting line of the tested lightning arrester 1 to ensure that the pincerlike current sensor display screen 12 can be in the visual field range of a tester, wherein the pincerlike current sensor 11 further comprises a metal core 13 and a coil winding 15, the metal core 13 is of an annular structure, an opening 14 is formed in one side of the metal core 13, the coil winding 15 is wound on the periphery of the metal core 13, a lead 16 is inserted into the inner side of the metal core 13, the pincerlike current sensor 11 further comprises a signal conditioning circuit 17, a processor 18 and a display screen 19, two ends of the coil winding 15 are electrically connected with the signal conditioning circuit 17, the output end of the signal conditioning circuit 17 is electrically connected with the input end of the processor 18, and the output end of the processor 18 is electrically connected with the input end of the display screen 19;
And S3, finally, the voltage is increased through the operation box 6, an operator observes the pincerlike current sensor display screen 12, when the current value of the pincerlike current sensor display screen 12 is one thousand microamperes, the voltage value at the moment is recorded, a 75% U1mA switch of the operation box 6 is clicked, and then the operator continuously observes the reading on the pincerlike current sensor display screen 12, namely the true leakage current of the tested lightning arrester 1.
In the several embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Claims (8)
1. A non-intrusive measurement method for true leakage current of a zinc oxide arrester is characterized by comprising the following steps:
S1, firstly, connecting a high-voltage output end of a direct-current high-voltage generator (4) with the upper part of a tested lightning arrester (1), then connecting a signal transmission port of the direct-current high-voltage generator (4) with an operation box (6) through a signal wire (5), and connecting a grounding end of the operation box (6) and a grounding end of the direct-current high-voltage generator (4) with a grounding flat iron (9) of the lightning arrester (1);
s2, clamping the pincerlike current sensor (11) at the upper end connecting line of the lightning arrester (1) to be tested, and ensuring that the pincerlike current sensor display screen (12) is within the visual field range of testers;
and S3, finally, the voltage is increased through the operation box (6), an operator observes the clamp-on current sensor display screen (12), when the current value of the clamp-on current sensor display screen (12) is one thousand microamperes, the voltage value at the moment is recorded, a 75% U1mA switch of the operation box (6) is clicked, and then the reading on the clamp-on current sensor display screen (12) is continuously observed, namely the true leakage current of the tested lightning arrester (1).
2. The non-intrusive measurement method of true leakage current of a zinc oxide arrester according to claim 1, characterized in that the clamp-on current sensor (11) further comprises:
a metal core (13);
A coil winding (15);
the coil winding (15) is wound on the periphery of the metal core (13), and a lead (16) is inserted into the inner side of the metal core (13).
3. A zinc oxide arrester true leakage current non-intrusive measurement method according to claim 2, characterized in that the metal core (13) further comprises:
an opening (14);
the metal core (13) is of an annular structure, and an opening (14) is formed in one side of the metal core (13).
4. A zinc oxide arrester true leakage current non-intrusive measurement method according to claim 3, characterized in that the clamp-on current sensor (11) further comprises:
a signal conditioning circuit (17);
a processor (18); and
a display screen (19);
the coil winding (15) both ends electricity signal connection has signal conditioning circuit (17), signal conditioning circuit (17) output and treater (18) input signal connection, treater (18) output and display screen (19) input signal connection.
5. The non-intrusive measurement method for the true leakage current of the zinc oxide arrester according to claim 1, characterized in that the direct current high voltage generator (4) is electrically coupled with an ammeter (3), a signal end of the ammeter (3) is fixedly connected with a high voltage wire (2) through a bolt, and one end of the high voltage wire (2) is fixedly connected with the arrester (1) through a bolt.
6. The non-intrusive measuring method for the true leakage current of the zinc oxide arrester as claimed in claim 1, characterized in that two ends of the signal wire (5) are respectively and fixedly connected with the direct current high voltage generator (4) and the operation box (6) through bolts, the top end of the grounding flat iron (9) is fixedly connected with a discharge counter (10) through bolts, and the input end of the discharge counter (10) is in electrical signal connection with the arrester (1).
7. The non-intrusive measuring method for the true leakage current of the zinc oxide arrester as claimed in claim 1, is characterized in that the two sides of the middle of the lower surface of the arrester (1) are fixedly connected with insulating pillars (7) through bolts, and the bottom ends of the two insulating pillars (7) are fixedly connected with supporting pillars (8) through bolts.
8. The non-intrusive measurement method of the true leakage current of the zinc oxide arrester according to claim 1, characterized in that the operation box (6) and the direct current high voltage generator (4) are grounded through the ground wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010588254.5A CN111856113A (en) | 2020-06-24 | 2020-06-24 | Non-intrusive measurement method for true leakage current of zinc oxide arrester |
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| CN202010588254.5A CN111856113A (en) | 2020-06-24 | 2020-06-24 | Non-intrusive measurement method for true leakage current of zinc oxide arrester |
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| CN111257604A (en) * | 2020-04-09 | 2020-06-09 | 国家电网有限公司 | Upper section test wiring device for 500kV and above voltage level lightning arrester |
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2020
- 2020-06-24 CN CN202010588254.5A patent/CN111856113A/en active Pending
Patent Citations (15)
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| CN201440567U (en) * | 2009-06-29 | 2010-04-21 | 中国电力工程顾问集团中南电力设计院 | Connecting device for lightning arrester and discharge counter |
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Application publication date: 20201030 |