CN112986656A - Temperature compensation type arrester resistive current testing device and using method thereof - Google Patents
Temperature compensation type arrester resistive current testing device and using method thereof Download PDFInfo
- Publication number
- CN112986656A CN112986656A CN202110282780.3A CN202110282780A CN112986656A CN 112986656 A CN112986656 A CN 112986656A CN 202110282780 A CN202110282780 A CN 202110282780A CN 112986656 A CN112986656 A CN 112986656A
- Authority
- CN
- China
- Prior art keywords
- current
- compensation
- temperature
- arrester
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Thermistors And Varistors (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention belongs to the technical field of power equipment state detection, and particularly relates to a temperature compensation type arrester resistive current testing device and a using method thereof, wherein the temperature compensation type arrester resistive current testing device comprises the following steps: arrester resistive current test subassembly, temperature compensation subassembly, direct current battery, valve block add line, compensation calculating circuit, compensation current line, display circuit and resistive current output line, the temperature compensation subassembly includes: the device comprises a container, a standard valve plate, a bottom electrode, a top electrode, a resistance wire and a top cover, wherein a direct-current voltage is applied to the standard valve plate by the direct-current battery to realize that the standard valve plate generates a compensation current, the top electrode is connected with a compensation calculation circuit through a compensation current wire to realize the transmission of the compensation current generated by the temperature compensation assembly, the device can solve the influence of the negative temperature coefficient characteristic of the insulation resistance of the arrester valve plate on a test result, and the test precision of the resistance current of the arrester is improved.
Description
Technical Field
The invention belongs to the technical field of power equipment state detection, and particularly relates to a temperature compensation type arrester resistive current testing device and a using method thereof.
Background
The lightning arrester is one of important protection devices for ensuring the safe operation of a power system, has the characteristics of high energy absorption capacity, stable protection performance and low residual voltage, and can meet the insulation protection requirement of a power grid; the lightning arrester resistive current test is an important means for detecting the insulation state of the lightning arrester, however, because the lightning arrester valve plate insulation resistor has a negative temperature coefficient, in the actual detection, the temperature of the lightning arrester can influence the test result of the resistive current; especially, under the operating conditions of large day-night temperature difference and large load variation, a large resistive current test error can be generated.
The existing arrester resistive current testing device does not consider the influence of negative temperature coefficient characteristics of a valve plate in an arrester on testing, and can cause misjudgment on the state of the arrester.
Disclosure of Invention
The device can solve the problem that the negative temperature coefficient characteristic of the insulating resistor of the valve plate of the lightning arrester has influence on the test result, and improves the test precision of the resistive current of the lightning arrester.
In order to solve the technical problems, the invention adopts the technical scheme that:
a temperature compensation type arrester resistive current testing device comprises: arrester resistive current test subassembly, temperature compensation subassembly, direct current battery, valve block add line, compensation calculating circuit, compensation current line, display circuit and resistive current output line, the temperature compensation subassembly includes: the bottom electrode is arranged on the upper end of the container in a clinging manner, the top electrode is arranged on the upper end of the standard valve block in a clinging manner, the top cover is arranged on the upper end of the container, a top current wiring end and a top voltage wiring end are arranged on the upper end of the top electrode, a bottom current wiring end and a bottom voltage wiring end are arranged on the side wall of the bottom electrode, the bottom current wiring end is grounded, the bottom voltage wiring end is connected with the negative electrode of a direct current battery, a heating device is arranged in the container, a conductive wiring terminal is arranged at the bottom of the container in a penetrating manner, and the bottom current wiring end and the bottom voltage wiring end are convenient to be led out of the container, the heating device is used for heating the standard valve plate, a temperature sensor is further arranged in the container and used for measuring the temperature of the standard valve plate, the positive electrode of a direct-current battery is connected with the top voltage wiring terminal through a valve plate pressurizing line, a direct-current switch is arranged on the valve plate pressurizing line, a resistive current signal of the lightning arrester resistive current testing assembly is connected into the compensation calculating circuit, the compensation calculating circuit is connected with the top current wiring terminal through a compensation current line, a conductive wiring terminal penetrates through the top cover, the valve plate pressurizing line and the compensation current line are conveniently led into the container to be connected with the wiring terminal, and the compensation calculating circuit is connected with the display circuit through a resistive current output line;
the standard valve plate can be selected from a single standard valve plate which is the same as the lightning arrester in the test, the standard valve plate has the same current temperature coefficient as the valve plate in the lightning arrester, and the standard valve plate can be replaced and selected according to the test requirement; the top electrode is connected with a compensation calculation circuit through a compensation current line to realize the transmission of compensation current generated by the temperature compensation component; the compensation calculating circuit is a common calculating circuit for implementing the add/subtract function, and therefore, it is not described in detail herein.
The lightning arrester resistive current test assembly comprises: the lightning arrester comprises a lightning arrester body, a lightning arrester base, an operating line, a voltage transformer, a leakage current test line and an orthogonal decomposition operation circuit, wherein the upper end of the lightning arrester body is connected with a power grid through the operating line, the lower end of the lightning arrester is connected with a lightning arrester base through a metal flange, the lower end of the lightning arrester base is grounded through a grounding wire, the metal flange is connected with the orthogonal decomposition operation circuit through a leakage current test line, one end of the high-voltage side of the voltage transformer is connected with the operation line, the other end of the high-voltage side of the voltage transformer is grounded, the low-voltage side signal of the voltage transformer is connected into the orthogonal decomposition operation circuit, the orthogonal decomposition operation circuit calculates resistive current without temperature compensation through leakage full current input by a leakage current test line and full voltage input by the voltage transformer, the calculation method and the orthogonal decomposition operation circuit are conventional techniques of lightning arrester resistive current test experiments.
The vertical a plurality of springs that are provided with in upper end of top electrode, the upper end of spring with the top cap is contradicted, through setting up the spring, closes the top cap after the lid, and the spring compresses tightly top electrode for top electrode, standard valve block and bottom electrode closely laminate, good contact, and more excellent, a plurality of springs are evenly arranged along the excircle of top electrode upper end.
Be provided with lateral wall wiring end A and lateral wall wiring end B on the lateral wall of container, heating device is the resistance wire, the resistance wire be the ring-type set up in the circumference of standard valve block to standard valve block thermally equivalent heaies up, the one end of resistance wire is connected with lateral wall wiring end A, the other end of resistance wire is connected with lateral wall wiring end B, lateral wall wiring end A and lateral wall wiring end B are connected with the dipole of direct current battery respectively, and the resistance wire is small, is convenient for install in the container, and the resistance wire can directly be supplied power by the direct current battery simultaneously, and it is more convenient to use.
The resistance wire is not in contact with the standard valve plate.
And the current temperature coefficient of the standard valve plate is the same as that of the valve plate in the lightning arrester.
The container is made of epoxy resin.
Preferably, the temperature sensor is further connected with a feedback control heating circuit, the feedback control heating circuit is used for controlling the heating device to work, the temperature of the standard valve plate is monitored through the temperature sensor, and then the heating device is controlled to be switched on and off through the feedback control heating circuit, so that the standard valve plate is maintained at the specified temperature, the feedback control heating circuit is realized by adopting the existing feedback circuit, and specific structural description is not provided herein.
The use method of the temperature compensation type arrester resistive current testing device comprises the following steps:
firstly, the resistive current testing component of the arrester does not work, and the heating device is started and controlled, so that the temperature of the standard valve plate is maintained to be T1，T1The method can adopt room temperature or other specific test temperature, close the DC switch, pressurize the standard valve plate by the DC battery, and generate compensation current I by the temperature compensation component1Passing the compensating current I through a compensating current line1The compensation calculation circuit is connected with the DC switch and is stored, and then the DC switch is switched off;
secondly, the lightning arrester resistive current testing component works to generate resistive current I2Resistive current I2The compensation calculation circuit is transmitted and stored;
thirdly, the temperature of the lightning arrester under the experimental state is measured by the staff to be T2The temperature of the standard valve plate is maintained to be T by controlling the heating device2Closing the DC switch, pressurizing the standard valve plate by the DC battery, and generating a compensation current I by the temperature compensation component3Passing the compensating current I through a compensating current line3To a compensation calculation circuit and stored;
fourthly, the compensation calculating circuit calculates T2At temperature and T1Difference value I of compensation current generated by temperature compensation component under temperature4Is of4=I3- I1；
Fifthly, calculating T through a compensation calculating circuit2Resistive electricity of lightning arrester at temperatureResistive current I generated by a flow test assembly2Subtracting the difference I in the fourth step4To obtain I5= I2- I4, I5I.e. the arrester is at T1Resistive current value at temperature, I5And displaying through a display circuit.
Compared with the prior art, the invention has the following beneficial effects.
According to the invention, the temperature compensation component is arranged to introduce the temperature compensation current, and finally the accurate measurement of the resistive current of the lightning arrester, which is not influenced by the environmental temperature, is realized through the compensation current calculation circuit, so that the error of the resistive current test is reduced.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of a lightning arrester resistive current testing assembly according to the present invention.
Fig. 3 is a top view of the top electrode of the present invention.
FIG. 4 is a top view of the resistance wire of the present invention.
In the figure: the device comprises a lightning arrester resistive current testing component 1, a lightning arrester 11, a lightning arrester base 12, an operating line 13, a voltage transformer 14, a leakage current testing line 15, an orthogonal decomposition arithmetic circuit 16, a temperature compensation component 2, a container 21, a side wall terminal A211, a side wall terminal B212, a standard valve plate 22, a bottom electrode 23, a bottom current terminal 231, a bottom voltage terminal 232, a top electrode 24, a top current terminal 241, a top voltage terminal 242, a spring 243, a top cover 25, a resistance wire 26, a direct current battery 3, a valve plate voltage-adding line 4, a direct current switch 41, a compensation calculating circuit 5, a compensation current line 6, a display circuit 7 and a resistive current output line 8.
Detailed Description
The following is a further description with reference to specific examples.
A temperature compensation type arrester resistive current testing device is characterized by comprising: lightning arrester resistive current test subassembly 1, temperature compensation subassembly 2, direct current battery 3, valve block add line 4, compensation calculating circuit 5, compensation current line 6, display circuit 7 and resistive current output line 8, temperature compensation subassembly 2 includes: the device comprises a container 21, a standard valve plate 22, a bottom electrode 23, a top electrode 24, a heating device and a top cover 25, wherein the lower end of an opening at the upper end of the container 21 is closed, the disc-shaped bottom electrode 23 is arranged at the lower end inside the container 21, the standard valve plate 22 is tightly attached to the upper end of the bottom electrode 23, and the top electrode 24 is tightly attached to the upper end of the standard valve plate 22;
the top cover 25 is arranged at the upper end of the container 21, the upper end of the top electrode 24 is provided with a top current terminal 241 and a top voltage terminal 242, the side wall of the bottom electrode 23 is provided with a bottom current terminal 231 and a bottom voltage terminal 232, the bottom current terminal 231 is grounded, the bottom voltage terminal 232 is connected with the negative electrode of the direct current battery 3, a heating device is arranged in the container 21 and used for heating the standard valve plate 22, a temperature sensor is also arranged in the container 21, the positive electrode of the direct current battery 3 is connected with the top voltage terminal 242 through a valve plate voltage adding line 4, a direct current switch 41 is arranged on the valve plate voltage adding line 4, the resistive current signal of the lightning arrester resistive current testing component 1 is connected into the compensation calculating circuit 5, and the compensation calculating circuit 5 is connected with the top current terminal 241 through a compensation current line 6, the compensation calculating circuit 5 is connected with the display circuit 7 through a resistive current output line 8.
The lightning arrester resistive current test assembly 1 comprises: the lightning arrester comprises a lightning arrester 11, a lightning arrester base 12, an operating line 13, a voltage transformer 14, a leakage current test line 15 and an orthogonal decomposition operation circuit 16, wherein the upper end of the lightning arrester 11 is connected to a power grid through the operating line 13, the lower end of the lightning arrester 11 is connected with a lightning arrester base 12 through a metal flange, the lower end of the lightning arrester base 12 is grounded through a grounding wire, and the metal flange is connected with an orthogonal decomposition operation circuit 16 through a leakage current test line 15, one end of the high-voltage side of the voltage transformer 14 is connected with the operating line 13, the other end is grounded, the low-voltage side signal of the voltage transformer 14 is connected to the orthogonal decomposition operation circuit 16, and the orthogonal decomposition operation circuit 16 calculates resistive current without temperature compensation through leakage full current input by a leakage current test line 15 and full voltage input by the voltage transformer 14.
Four springs 243 are vertically arranged at the upper end of the top electrode 24, and the upper ends of the springs 243 are abutted against the top cover 25.
The side wall of the container 21 is provided with a side wall terminal A211 and a side wall terminal B212, the heating device is a resistance wire 26, the resistance wire 26 is annularly arranged in the circumferential direction of the standard valve plate 22, one end of the resistance wire 26 is connected with the side wall terminal A211, the other end of the resistance wire 26 is connected with the side wall terminal B212, and the side wall terminal A211 and the side wall terminal B212 are respectively connected with two poles of the direct current battery 3.
The resistance wire 26 is not in contact with the standard valve plate 22.
The standard valve plate 22 has the same current temperature coefficient as the valve plate in the lightning arrester 11.
The material of the container 21 is epoxy resin.
The temperature sensor is also connected with a feedback control heating circuit, and the feedback control heating circuit is used for controlling the heating device to work.
The embodiment of the using method of the temperature compensation type arrester resistive current testing device is as follows:
firstly, the lightning arrester resistive current testing component does not work, the heating device is started and controlled, the temperature of the standard valve plate is maintained at 20 ℃, the direct current switch is closed, the direct current battery pressurizes the standard valve plate, and the compensation current I generated by the temperature compensation component1Passing the compensating current I through a compensating current line1The compensation calculation circuit is connected with the DC switch and is stored, and then the DC switch is switched off;
secondly, the lightning arrester resistive current testing component works to generate resistive current I2Resistive current I2The compensation calculation circuit is transmitted and stored;
thirdly, the temperature of the lightning arrester under the experimental state is measured by the staff to be T2Through control ofMaking the heating device so that the temperature of the standard valve plate is maintained at T2Closing the DC switch, pressurizing the standard valve plate by the DC battery, and generating a compensation current I by the temperature compensation component3Passing the compensating current I through a compensating current line3To a compensation calculation circuit and stored;
fourthly, the compensation calculating circuit calculates T2Difference I of compensation current generated by temperature compensation assembly at temperature and 20 DEG C4Is of4=I3- I1；
Fifthly, calculating T through a compensation calculating circuit2Resistive current I generated by lightning arrester resistive current testing component at temperature2Subtracting the difference I in the fourth step4To obtain I5= I2- I4, I5Namely the resistance current value, I, of the lightning arrester at the temperature of 20 DEG C5And displaying through a display circuit.
The above embodiments are merely illustrative of the principles of the present invention and its effects, and do not limit the present invention. It will be apparent to those skilled in the art that modifications and improvements can be made to the above-described embodiments without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications or changes be made by those skilled in the art without departing from the spirit and technical spirit of the present invention, and be covered by the claims of the present invention.
Claims (9)
1. A temperature compensation type arrester resistive current testing device is characterized by comprising: arrester resistive current test subassembly (1), temperature compensation subassembly (2), direct current battery (3), valve block add voltage line (4), compensation calculating circuit (5), compensation current line (6), display circuit (7) and resistive current output line (8), temperature compensation subassembly (2) include: container (21), standard valve block (22), bottom electrode (23), top electrode (24), heating device and top cap (25), container (21) upper end opening lower extreme is sealed, discoid bottom electrode (23) set up in the inside lower extreme of container (21), standard valve block (22) hug closely set up in the upper end of bottom electrode (23), top electrode (24) hug closely set up in the upper end of standard valve block (22), top cap (25) set up in the upper end of container (21), the upper end of top electrode (24) is provided with top current terminal (241) and top voltage terminal (242), be provided with bottom current terminal (231) and bottom voltage terminal (232) on the lateral wall of bottom electrode (23), bottom current terminal (231) ground connection, bottom voltage terminal (232) are connected with direct current cell (3) negative pole, be provided with heating device in container (21), heating device be used for right standard valve block (22) heating, still be provided with temperature sensor in container (21), the anodal valve block add line (4) of direct current battery (3) pass through with top voltage terminal (242) are connected, be provided with direct current switch (41) on valve block add line (4), the resistive current signal of arrester resistive current test subassembly (1) inserts compensation calculating circuit (5), compensation calculating circuit (5) through compensating current line (6) with top current terminal (241) are connected, compensation calculating circuit (5) through resistive current output line (8) with display circuit (7) are connected.
2. A temperature-compensated arrester resistive current testing device according to claim 1, characterized in that the arrester resistive current testing assembly (1) comprises: arrester (11), arrester base (12), operation circuit (13), voltage transformer (14), leakage current test wire (15) and quadrature decomposition arithmetic circuit (16), the upper end of arrester (11) is passed through operation circuit (13) inserts the electric wire netting, the lower extreme of arrester (11) has arrester base (12) through metal flange connection, the lower extreme of arrester base (12) passes through earth connection ground, just metal flange is connected with quadrature decomposition arithmetic circuit (16) through leakage current test wire (15), the one end and the operation circuit (13) of the high pressure side of voltage transformer (14) are connected, the other end ground connection, the low pressure side voltage signal of voltage transformer (14) inserts quadrature decomposition arithmetic circuit (16), quadrature decomposition arithmetic circuit (16) through the leakage total current of leakage current test wire (15) input and the voltage calculation of voltage transformer (14) input does not have temperature Compensated resistive current.
3. A temperature compensation type arrester resistive current testing device according to claim 1, characterized in that a plurality of springs (243) are vertically arranged at the upper end of the top electrode (24), and the upper ends of the springs (243) are abutted with the top cover (25).
4. The device for testing the resistive current of the temperature compensation type lightning arrester according to claim 1, characterized in that a side wall terminal A (211) and a side wall terminal B (212) are arranged on the side wall of the container (21), the heating device is a resistance wire (26), the resistance wire (26) is annularly arranged in the circumferential direction of the standard valve plate (22), one end of the resistance wire (26) is connected with the side wall terminal A (211), the other end of the resistance wire (26) is connected with the side wall terminal B (212), and the side wall terminal A (211) and the side wall terminal B (212) are respectively connected with two poles of a direct current battery (3).
5. A temperature compensation type arrester resistive current testing device according to claim 4, characterized in that the resistance wire (26) is not in contact with the standard valve sheet (22).
6. The device for testing the resistive current of the temperature compensation type arrester according to claim 2, wherein the standard valve plate (22) has the same current temperature coefficient with the valve plate in the arrester (11).
7. The device for testing the resistive current of the temperature compensation type lightning arrester according to claim 1, wherein the container (21) is made of epoxy resin.
8. The device for testing the resistive current of the temperature compensation type lightning arrester according to claim 4, wherein the temperature sensor is further connected with a feedback control heating circuit, and the feedback control heating circuit is used for controlling the heating device to work.
9. The use method of the temperature compensation type arrester resistive current testing device according to any one of claims 1 to 8, characterized by comprising the following steps:
firstly, the resistive current testing component of the arrester does not work, and the heating device is started and controlled, so that the temperature of the standard valve plate is maintained to be T1，T1The method can adopt room temperature or other specific test temperature, close the DC switch, pressurize the standard valve plate by the DC battery, and generate compensation current I by the temperature compensation component1Passing the compensating current I through a compensating current line1The compensation calculation circuit is connected with the DC switch and is stored, and then the DC switch is switched off;
secondly, the lightning arrester resistive current testing component works to generate resistive current I2Resistive current I2The compensation calculation circuit is transmitted and stored;
thirdly, the temperature of the lightning arrester under the experimental state is measured by the staff to be T2The temperature of the standard valve plate is maintained to be T by controlling the heating device2Closing the DC switch, pressurizing the standard valve plate by the DC battery, and generating a compensation current I by the temperature compensation component3Passing the compensating current I through a compensating current line3To a compensation calculation circuit and stored;
fourthly, the compensation calculating circuit calculates T2At temperature and T1Difference value I of compensation current generated by temperature compensation component under temperature4Is of4=I3- I1；
Fifthly, calculating T through a compensation calculating circuit2Resistive current I generated by lightning arrester resistive current testing component at temperature2Subtracting the difference I in the fourth step4To obtain I5= I2- I4, I5I.e. the arrester is at T1Temperature ofResistance current value of5And displaying through a display circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110282780.3A CN112986656B (en) | 2021-03-16 | 2021-03-16 | Temperature compensation type lightning arrester resistive current testing device and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110282780.3A CN112986656B (en) | 2021-03-16 | 2021-03-16 | Temperature compensation type lightning arrester resistive current testing device and application method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112986656A true CN112986656A (en) | 2021-06-18 |
| CN112986656B CN112986656B (en) | 2023-09-26 |
Family
ID=76335985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110282780.3A Active CN112986656B (en) | 2021-03-16 | 2021-03-16 | Temperature compensation type lightning arrester resistive current testing device and application method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112986656B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114924109A (en) * | 2022-07-20 | 2022-08-19 | 深圳市英特瑞半导体科技有限公司 | Method, circuit and device for testing low-power chip current |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54161044A (en) * | 1978-06-09 | 1979-12-20 | Fuji Electric Co Ltd | Boosting detection method for arrester for enclosed switchgear |
| WO2017016361A1 (en) * | 2015-07-29 | 2017-02-02 | 王富元 | Online monitoring method for resistive leakage current of metal-oxide-varistor lightning arrester or surge protection device |
| CN111965469A (en) * | 2020-09-11 | 2020-11-20 | 陕西世翔电子科技有限公司 | Method for carrying out online monitoring on lightning arrester through temperature sensor |
-
2021
- 2021-03-16 CN CN202110282780.3A patent/CN112986656B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54161044A (en) * | 1978-06-09 | 1979-12-20 | Fuji Electric Co Ltd | Boosting detection method for arrester for enclosed switchgear |
| WO2017016361A1 (en) * | 2015-07-29 | 2017-02-02 | 王富元 | Online monitoring method for resistive leakage current of metal-oxide-varistor lightning arrester or surge protection device |
| CN111965469A (en) * | 2020-09-11 | 2020-11-20 | 陕西世翔电子科技有限公司 | Method for carrying out online monitoring on lightning arrester through temperature sensor |
Non-Patent Citations (1)
| Title |
|---|
| 胡锡幸;鲍巧敏;华盛继;: "基于温度补偿的金属氧化物避雷器带电检测技术研究", 电瓷避雷器, no. 01 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114924109A (en) * | 2022-07-20 | 2022-08-19 | 深圳市英特瑞半导体科技有限公司 | Method, circuit and device for testing low-power chip current |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112986656B (en) | 2023-09-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105026899A (en) | Method and apparatus for monitoring a predefined filling level of a medium in a container | |
| CN102798782B (en) | High-voltage insulation resistance monitoring alarm | |
| CN112986656A (en) | Temperature compensation type arrester resistive current testing device and using method thereof | |
| GB2045933A (en) | Fluid level responsive control circuit | |
| CN206602067U (en) | Pole | |
| CN203798883U (en) | Micro-current high-precision resistor type voltage dividing device | |
| CN109188088B (en) | A kind of vertical demixing electric resistance of soil nonlinear characteristic test method | |
| Baranov et al. | A switching aperiodic superhigh-voltage pulse generator for testing the electric strength of insulation of technical objects | |
| CN207817124U (en) | A kind of electric connector leakage current and insulation resistance measuring device | |
| CN108181600B (en) | Capacitor voltage transformer testing device | |
| CN203085890U (en) | Plug with electric leakage protection function | |
| US3029383A (en) | Apparatus for testing the isolation of an electrical conductor from a supply source | |
| CN206992512U (en) | A kind of intelligent type low-voltage comprehensive distribution cabinet | |
| KR101454121B1 (en) | A detection device of leakage current for deterioration diagnosis of DC lightning arresters | |
| CN208672747U (en) | Solid dielectric polarization depolarization current measuring device | |
| CN101699303A (en) | Circuit for detecting insulation fault of solar battery | |
| CN109613405B (en) | Oiled paper composite insulation dielectric response testing device | |
| CN202333745U (en) | Electric leakage protector with temperature protection | |
| CN206892217U (en) | A kind of multicolumn lightning arrester connected in parallel flows test resistance piece post test device | |
| CN207215956U (en) | A kind of gravity contacts pressure resistant testing device | |
| CN203745494U (en) | Milliampere current generator | |
| WO1991012541A1 (en) | Atmospheric potential measurement device | |
| CN109856487A (en) | Study the fever simulator of GIS inner conductor and skin temperature corresponding relationship | |
| CN213242108U (en) | Monitoring integration arrester | |
| CN207866897U (en) | insulation resistance tester |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |