CN107894519B - 220kV and above voltage class multisection zinc oxide arrester comprehensive test box - Google Patents
220kV and above voltage class multisection zinc oxide arrester comprehensive test box Download PDFInfo
- Publication number
- CN107894519B CN107894519B CN201711247008.8A CN201711247008A CN107894519B CN 107894519 B CN107894519 B CN 107894519B CN 201711247008 A CN201711247008 A CN 201711247008A CN 107894519 B CN107894519 B CN 107894519B
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- Prior art keywords
- arrester
- busbar
- disconnecting link
- test
- zinc oxide
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Classifications
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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
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
Abstract
The invention relates to a comprehensive test box for a multi-section zinc oxide lightning arrester with a voltage level of 220kV and above. The problems that the existing zinc oxide lightning arrester with the voltage level of 220kv or above needs to be subjected to ascending operation and a more complete ammeter needs to be subjected to power failure during testing are mainly solved. The method is characterized in that: the novel high-voltage power supply is characterized in that a metal busbar (13) is connected to a first insulating busbar (4) at the upper end through an insulator (12), the metal busbar (13) is connected with a metal copper busbar (5) led out from the tail end of a zinc oxide arrester, the metal busbar (13) is connected with a second insulating busbar (4) through a cable A (14), a cable B (15) and a cable C (16) respectively, and a working disconnecting link (1), a test disconnecting link (2) and a grounding disconnecting link (3) are sequentially fixed on a third insulating busbar (4) from left to right. The comprehensive test box not only improves the working efficiency of power failure, electrification test, detection and replacement of the counter full ammeter, but also greatly reduces the potential safety hazard and operation risk in the working process.
Description
Technical Field
The invention relates to the field of electric power, in particular to a comprehensive test box for a multi-section zinc oxide arrester with a voltage level of 220kV and above.
Background
The zinc oxide arrester (MOA for short) is a main device for protecting the safe and stable operation of a power system, the zinc oxide arrester is equivalent to a nonlinear resistor with 2 to 3 sections connected in series, and the main principle is that the good nonlinear volt-ampere characteristic of zinc oxide is utilized to play roles of discharging and breaking, when overvoltage acts, the resistor is rapidly reduced to discharge the energy of overvoltage to achieve the protection effect, and the current flowing through the arrester is extremely small (microampere or milliamp level) when the normal working voltage acts.
In the normal operation of the power system, the routine test items for the zinc oxide lightning arrester are as follows: 1. insulation resistance measurement to determine if the arrester is wet, for large fuses insideCan also check if the internal fuse is intact; 2. critical action voltage U when measuring DC 1mA 1mA Mainly checking whether the valve plate is good in insulation or not, and determining whether the action performance of the valve plate meets the requirement or not; 3. measuring DC 75% U 1mA Leakage current at the time of detection of whether or not long-term allowable operating current meets regulation, 75% U according to regulation 1mA The leakage current value is not more than 50 mu A, and the good performance can be ensured only if each index of MOA is in a qualified range, so that the safety of electrical equipment is protected.
In the live test of the zinc oxide arrester, the live full ammeter (counter) of the zinc oxide arrester with the voltage level of 220kV and above is high, when the live test of the arrester is performed, a ladder is needed to be placed and connected to the tail end outgoing line of the zinc oxide arrester, workers ascend to work, great risks are increased for the workers, the workers are easily injured by electric shock, and the working efficiency is low and the risks are high. In normal operation, the full ammeter (counter) is exposed outside for a long time, wind blows and rain blows, water inlet and damp are often caused by poor sealing, a pointer is clamped, and the lightning arrester does not act after the counter is corroded. Moreover, in operation, the lightning arrester is damaged due to the fact that the full ammeter is exposed in the air and is easy to enter water to be wetted, and the full ammeter (counter) is replaced, so that the lightning arrester can be replaced after power failure, and production is affected.
Disclosure of Invention
In order to overcome the defects that the existing 220kV and above voltage class zinc oxide arrester needs to be subjected to ascending operation and a more complete ammeter needs to be subjected to power failure during testing, the invention provides the 220kV and above voltage class multisection zinc oxide arrester comprehensive test box, and the comprehensive test box can greatly reduce the potential safety hazard during testing the zinc oxide arrester, reduce the damage probability of the complete ammeter and greatly reduce the power failure caused by replacing the complete ammeter.
The technical scheme of the invention is as follows: the utility model provides a 220kV and above voltage class multisection zinc oxide arrester comprehensive test case, includes the box, is fixed with four insulating busbar and a ground connection metal row from top to bottom in proper order in the box, be connected with metal busbar through the insulator on the first insulating busbar of upper end, metal busbar is connected with zinc oxide arrester terminal extraction metal copper row, and is connected with the second insulating busbar through cable A, cable B, cable C respectively on the metal busbar, be fixed with work switch, test switch, ground connection switch on the third insulating busbar from left to right in proper order, and work switch, test switch, ground connection switch correspond with cable A, cable B, cable C respectively; the working disconnecting link is used for controlling the counter to be connected with the metal busbar, the test disconnecting link is used for controlling the metal busbar to be connected with the voltage division lightning arrester, and the grounding disconnecting link is used for controlling the metal busbar to be connected with the grounding metal busbar.
The upper end of the voltage division lightning arrester is connected with the wiring terminal A, and the lower end of the voltage division lightning arrester is connected with the wiring terminal B.
When measuring the lower section arrester, closing the test disconnecting link, connecting the partial pressure arrester in series at the lead wire at the top end of the upper section arrester and grounding the partial pressure arrester, simultaneously pressurizing the bottom end of the upper section arrester, and connecting a milliamp meter at the connection terminal A to measure the leakage current value of the lower section arrester and the critical action voltage U when 1mA 1 mA。
When the upper section of the lightning arrester is measured, a high-voltage lead is not dismounted once and is grounded when the upper section of the 220kV voltage class lightning arrester is measured, a test disconnecting link is closed to introduce a voltage division lightning arrester, a milliamp meter A is connected to a wiring terminal B and is grounded, the bottom end of the upper section of the lightning arrester is pressurized, another milliamp meter B is connected to a direct current booster, critical action voltage in the upper section of the lightning arrester during the measurement process is started first, and the value of the milliamp meter A is subtracted by the value of the milliamp meter B to obtain the leakage current value of the upper section of the lightning arrester.
When the power failure test is not performed, the test disconnecting link is closed, and the electrified testing instrument binding clip is clamped on the binding post A, so that the electrified testing instrument binding clip is connected to the metal copper bar led out from the tail end of the zinc oxide arrester.
When the counter is detected, the pointer sensitivity and the quality of the counter can be detected by closing the grounding knife switch, namely, grounding the metal copper bar.
The grounding disconnecting link is firstly closed, and then the working disconnecting link is pulled open, so that the full ammeter counter can be replaced in an electrified mode.
The invention has the following beneficial effects: due to the adoption of the scheme, the comprehensive test box for the zinc oxide lightning arrester with the voltage level of 220kV and above not only improves the working efficiency of power failure, electrification tests and counter meter test replacement detection tests, but also greatly reduces the potential safety hazard and operation risk in work, reasonably controls the risk in work, completely avoids electric shock injury, and can be used for live working by 4 people at present. The full ammeter (counter) is placed in the dampproof box, so that the damage of the water inlet caused by exposure in the air in the past is avoided, the service life is prolonged, and the funds for equipment replacement are saved. The pointer sensitivity and the quality of the full ammeter (counter) are detected, and whether the numerical value of the full ammeter indication of the lightning arrester is abnormal is caused by the damage of the full ammeter or the fault of the lightning arrester can be primarily judged. In the past, when the full ammeter (counter) is damaged due to faults, the replacement can be performed only by power failure, and by adopting the comprehensive test box, unnecessary power failure caused by replacement of the full ammeter (counter) can be reduced, the power supply reliability is improved, and the working concept is changed.
Drawings
Fig. 1 is a schematic structural view of the present invention.
1-working knife switch in the figure; 2-testing a knife switch; 3-grounding knife switch; 4-insulating busbar; 5-metal copper bars; 6-connecting terminal A; 7-a voltage division lightning arrester; 8-a wiring terminal B; 9-a counter; 10-small sleeve; 11-a viewing window; 12-an insulator; 13-metal busbar; 14-cable a;15 cable B; 16-cable C; 17-grounded metal bars.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, the comprehensive test box for the zinc oxide lightning arrester with the voltage level of 220kV and above comprises a box body, wherein a box door is arranged in front of the box body, an observation window 11 is formed in the box door, and the observation window 11 is made of transparent glass and can observe the conditions in the box. Four insulating busbar 4 and a ground metal row 17 are fixed in the box from top to bottom in proper order, be connected with metal busbar 13 through insulator 12 on the first insulating busbar 4 of upper end, metal busbar 13 is connected with zinc oxide arrester terminal extraction metal copper bar 5, little sleeve pipe 10 is connected to metal copper bar 5 lower extreme, metal busbar 13 is last to be connected with the second insulating busbar 4 through cable A14, cable B15, cable C16 respectively, be fixed with work switch 1, test switch 2, ground switch 3 on the third insulating busbar 4 from left to right in proper order, the switch other end is located the second insulating busbar, and work switch 1, test switch 2, ground switch 3 correspond with cable A14, cable B15, cable C16 respectively, so three switch back accessible above-mentioned three cable links to each other with metal busbar 13.
The working knife switch 1 can be connected with the control counter 9 after being closed, the voltage division arrester 7 can be connected with the metal busbar 13 after being closed, and meanwhile, the upper end of the voltage division arrester 7 is connected with the wiring terminal A6, and the lower end of the voltage division arrester is connected with the wiring terminal B8. The voltage division arrester 7 plays a role in voltage division when the upper section leakage current of the zinc oxide arrester is measured in a power failure test, and when the upper section leakage current of the zinc oxide arrester is measured in the power failure test, the upper end lead of the arrester can be grounded without being disassembled, a microammeter is connected to the wiring terminal B8 and is grounded, and the leakage current of the upper section of the arrester is obtained by subtracting the value of the microammeter connected to the wiring terminal B8 from the value of the microammeter connected to the direct current booster. When the grounding disconnecting link 3 is closed, the metal busbar 13 is connected with the grounding metal busbar 17, and the working disconnecting link 1 is pulled open at the moment, so that the counter 9 can be replaced in a charged mode, the grounding disconnecting link is also used for preliminarily judging whether a full ammeter (counter) has faults or not, and the counter is also convenient to detect by a detecting instrument.
For measuring the leakage current of the zinc oxide lightning arrester with 220kV voltage class, the high-voltage lead wire can be not detached once for measurement through the comprehensive test terminal box.
1. When the lower section arrester is measured in a power failure test, the test disconnecting link 2 is closed, the voltage division arrester is connected in series at the lead wire at the top end of the upper section arrester and grounded through the voltage division arrester, meanwhile, the bottom end of the upper section arrester is pressurized, and the microammeter is connected at the connection terminal A6, so that the leakage current value of the lower section arrester and the critical action voltage U when 1mA can be measured 1 mA. Critical action voltage U of voltage division lightning arrester with rated voltage of 5kV at 1mA 1 mA is 7.2kV, thus limiting the voltage simultaneously applied to the upper end of the bus voltage transformerThe insulation of the voltage transformer is not damaged, but the top end of the voltage transformer is subjected to discharge treatment after the test is finished.
2. When the upper section arrester is measured in a power failure test, a high-voltage lead is not dismounted once and is grounded when the upper section of the 220kV voltage class arrester is measured, the test disconnecting link 2 is closed to introduce the voltage division arrester 7, the milliamp meter A is connected to the position of the wiring terminal B8 and is grounded, the bottom end of the upper section arrester is pressurized, the direct current booster is connected with the other milliamp meter B, the critical action voltage of the upper section 1mA in the measuring process is started first, the value of the milliamp meter B is subtracted by the value of the milliamp meter A to obtain the leakage current value of the upper section arrester, the critical action voltage of the lower section arrester 1mA is raised when the voltage division arrester 7 is introduced, the critical action voltage of the upper section 1mA is started first when the bottom end of the upper section arrester is pressurized, the critical action voltage of the lower section arrester is delayed, the voltage division arrester 7 is a small arrester which is tested through the test, the influence of the dispersion current of an insulating base is not caused, the small zinc oxide valve plate with the rated voltage of 5kV, and the critical action voltage of the lower section 1mA is 7.2kV.
3. When the live test is carried out without power failure, namely, the live test is carried out, the test knife switch 2 is closed, the live test instrument binding clip is clamped on the binding post A6, and therefore the live test instrument binding clip is connected to the metal copper bar 5 led out from the tail end of the zinc oxide arrester, the live test measurement is facilitated, the safety of test personnel is guaranteed, and the working efficiency is improved.
4. When detecting the full ammeter (counter), closing the earthing knife-switch 3 and earthing the metal copper bar 5, the pointer sensitivity and the quality of the full ammeter (counter) can be detected, and whether the lightning arrester full ammeter indicates that the numerical value is abnormal is judged to be due to the damage of the full ammeter or the failure of the lightning arrester preliminarily, so that unnecessary power failure caused by the damage and replacement of the full ammeter (counter) is reduced, and the power supply reliability is improved.
5. The grounding disconnecting link 3 is firstly closed, and then the working disconnecting link 1 is pulled open, so that the full ammeter counter can be conveniently replaced in an electrified mode.
Claims (3)
1. The utility model provides a 220kV and above voltage class multisection zinc oxide arrester comprehensive test case, includes the box, is fixed with four insulating busbar (4) and a ground connection metal row (17) from top to bottom in proper order in the box, its characterized in that: the first insulating busbar (4) at the upper end is connected with a metal busbar (13) through an insulator (12), the metal busbar (13) is connected with a metal copper bar (5) led out from the tail end of a zinc oxide arrester, the metal busbar (13) is respectively connected with the second insulating busbar (4) through a cable A (14), a cable B (15) and a cable C (16), a working disconnecting link (1), a test disconnecting link (2) and a grounding disconnecting link (3) are sequentially fixed on the third insulating busbar (4) from left to right, and the working disconnecting link (1), the test disconnecting link (2) and the grounding disconnecting link (3) are respectively corresponding to the cable A (14), the cable B (15) and the cable C (16); the working disconnecting link (1) is used for controlling the counter (9) to be connected with the metal busbar (13), the test disconnecting link (2) is used for controlling the metal busbar (13) to be connected with the voltage division lightning arrester (7), and the grounding disconnecting link (3) is used for controlling the metal busbar (13) to be connected with the grounding metal busbar (17);
the upper end of the voltage division lightning arrester (7) is connected with the wiring terminal A (6), and the lower end of the voltage division lightning arrester is connected with the wiring terminal B (8);
when the power failure test is not performed, the test disconnecting link (2) is closed, and the electrified test instrument binding clip is clamped on the binding post A (6), so that the electrified test instrument binding clip is connected to the metal copper bar (5) led out from the tail end of the zinc oxide arrester;
when the counter is detected, the grounding knife switch (3) is closed, namely the metal copper bar (5) is grounded, so that the pointer sensitivity of the counter can be detected.
2. The 220kV and above voltage class multisection zinc oxide arrester comprehensive test box of claim 1, characterized in that: when measuring the lower section arrester, the test disconnecting link (2) is closed, the voltage division arrester is connected in series at the lead wire at the top end of the upper section arrester and grounded through the voltage division arrester, meanwhile, the bottom end of the upper section arrester is pressurized, and the milliamp meter is connected at the connecting terminal A (6), so that the leakage current value of the lower section arrester can be measuredAnd a critical operating voltage U at 1mA 1 mA。
3. The 220kV and above voltage class multisection zinc oxide arrester comprehensive test box of claim 2, characterized in that: when the upper section arrester is measured, a high-voltage lead is not dismounted once and is grounded when the upper section of the 220kV voltage class arrester is measured, a test disconnecting link (2) is closed to introduce a voltage division arrester (7), a milliamp meter A is connected to the position of a wiring terminal B (8) and is grounded, the bottom end of the upper section arrester is pressurized, the other milliamp meter B is connected to the direct current booster, critical action voltage in the upper section of 1mA is started first in the measuring process, and the value of the milliamp meter A is subtracted by the value of the milliamp meter B to obtain the leakage current value of the upper section of the arrester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711247008.8A CN107894519B (en) | 2017-12-01 | 2017-12-01 | 220kV and above voltage class multisection zinc oxide arrester comprehensive test box |
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|---|---|---|---|
| CN201711247008.8A CN107894519B (en) | 2017-12-01 | 2017-12-01 | 220kV and above voltage class multisection zinc oxide arrester comprehensive test box |
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| CN107894519A CN107894519A (en) | 2018-04-10 |
| CN107894519B true CN107894519B (en) | 2023-08-04 |
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| CN201711247008.8A Active CN107894519B (en) | 2017-12-01 | 2017-12-01 | 220kV and above voltage class multisection zinc oxide arrester comprehensive test box |
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| CN109374954B (en) * | 2018-08-22 | 2020-11-13 | 国网天津市电力公司电力科学研究院 | Novel transmission line parameter measurement test line |
| CN108761149B (en) * | 2018-08-24 | 2021-01-05 | 湖北仪天成电力设备有限公司 | Zinc oxide arrester live-line tester |
| 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 |
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Address after: 163458 Heilongjiang Province, Daqing City Ranghulu District No. 409 South Central Avenue Applicant after: DAQING POWER SUPPLY COMPANY OF STATE GRID HEILONGJIANG ELECTRIC POWER Co.,Ltd. Applicant after: STATE GRID CORPORATION OF CHINA Address before: 163458 Heilongjiang Province, Daqing City Ranghulu District No. 409 South Central Avenue Applicant before: DAQING POWER SUPPLY COMPANY OF STATE GRID HEILONGJIANG ELECTRIC POWER Co.,Ltd. Applicant before: State Grid Corporation of China |
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