CN111596204B - Alternating-current field breaker fracture alternating-current withstand voltage test system and method - Google Patents
Alternating-current field breaker fracture alternating-current withstand voltage test system and method Download PDFInfo
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- CN111596204B CN111596204B CN202010392471.7A CN202010392471A CN111596204B CN 111596204 B CN111596204 B CN 111596204B CN 202010392471 A CN202010392471 A CN 202010392471A CN 111596204 B CN111596204 B CN 111596204B
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- 238000000034 method Methods 0.000 title claims abstract description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 239000010949 copper Substances 0.000 claims description 11
- 238000010998 test method Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
-
- 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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
- G01R31/3274—Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
The invention relates to an alternating-current field breaker fracture alternating-current withstand voltage test system, which comprises a plurality of groups of connecting strings, wherein each connecting string comprises three groups of breakers, two ends of each connecting string are respectively connected with a first bus group and a second bus group, the first bus group comprises A, B, C three-phase buses, the second bus group comprises D, E, F three-phase buses, and A, B, C three-phase buses are respectively and sequentially connected with D, E, F three-phase buses through the connecting strings; the two ends of each connecting string are respectively provided with a bus disconnecting link, and a temporary grounding wire for grounding is hung in the middle of a fracture of the circuit breaker. By adopting the technical scheme, the field workload of workers is reduced, and the efficiency of the pressure-resistant test on multiple groups of fractures is improved; meanwhile, the stability of test equipment is prevented from being reduced, and potential safety hazards in the test process are reduced.
Description
Technical Field
The invention relates to the technical field of circuit breakers, in particular to an alternating current field circuit breaker fracture alternating current withstand voltage test system and method.
Background
The 500kV alternating current field of the large-scale transformer station generally adopts a wiring mode of double buses for 3/4, the alternating current field is divided into a plurality of series connection strings, each series connection string comprises 2 groups of bus disconnecting switches, 3 groups of circuit breakers and 4 groups of circuit breaker disconnecting switches, the circuit breakers adopt double-break open voltages, each break is connected with a voltage-equalizing capacitor in parallel, and the wiring mode is shown in figure 1. When the breaker fracture is subjected to an alternating current withstand voltage test, the voltage-sharing capacitor is subjected to an interelectrode alternating current withstand voltage test, and the voltage-sharing capacitor is required to be subjected to a similar power frequency (45-65 Hz) during the withstand voltage test, so that the similar power frequency voltage is required to be used during the fracture withstand voltage test. In the past engineering, the industrial frequency inductance-adjusting series resonance device is generally adopted to carry out breaker fracture alternating current withstand voltage test, when a group of breakers are subjected to fracture withstand voltage test, the middle of a breaker fracture is pressurized, the two sides of the fracture are grounded, the number of groups of breakers in an alternating current field is increased, the test is carried out for a number of times, the workload of disassembly test equipment is very large, and the test equipment is relatively troublesome to move.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide an alternating current field breaker fracture alternating current withstand voltage test system and method, which have the advantages of reducing test workload and improving the efficiency of withstand voltage tests on multiple groups of fracture.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the utility model provides an alternating current field circuit breaker fracture alternating current withstand voltage test system, includes a plurality of groups of connection strings (1), each connection string is including three groups of circuit breakers, and the both ends of a plurality of groups of connection strings (1) are connected with first busbar group and second busbar group respectively, first busbar group is including A, B, C three-phase bus, second busbar group is including D, E, F three-phase bus, A, B, C three-phase bus is through connection string corresponds respectively with D, E, F three-phase bus in proper order; and the two ends of each connecting string are respectively provided with a bus disconnecting link, and a temporary grounding wire for grounding is hung in the middle of a fracture of the circuit breaker.
By adopting the technical scheme, under the condition that a test device is not moved, after the alternating current withstand voltage of 3 groups of breaker fracture of the test string is completed, other test strings are exchanged with the current test string, and finally the test string is exchanged with the contact string, so that the alternating current withstand voltage test of the whole field breaker fracture is completed, and when the withstand voltage test of the whole field breaker fracture is developed, multiple disassembly and assembly test equipment and personnel mobile equipment are not needed, the field workload of staff is reduced, and the efficiency of the withstand voltage test of multiple groups of fracture is improved; meanwhile, the damage to the thread end caused by repeated disassembly and assembly of the test equipment is reduced, the stability of the test equipment is avoided, and the potential safety hazard in the test process is reduced.
The invention is further provided with: the contact string is provided with two groups of short-circuit copper wires, and two groups of short-circuit copper wires are positioned between two groups of bus disconnecting links.
Through adopting above-mentioned technical scheme, when the electric current capacity of experimental reactor is not enough, operating personnel can short circuit A, B, C three-phase bus switch and D, E, F three-phase bus switch through the short circuit copper line for only to any single-phase or diphase bus in A, B, C three-phase bus and D, E, F three-phase bus in any single-phase or diphase bus add pressure can, through the quantity of adjusting the pressurization bus, the capacity of rational change sample, under 45 ~ 65 Hz's frequency, realize the condition that inductive reactance equals the capacitive reactance, reach the purpose of frequency conversion series resonance, improved the commonality and the adaptability of system.
A fracture alternating current withstand voltage test method of an alternating current field circuit breaker comprises the following steps:
the bus disconnecting link of the contact string where the test circuit breaker is located is arranged in a closing state, and the test circuit breaker is disconnected;
a group of connection strings and connection strings where the test circuit breakers are positioned are selected at will to form a loop, and a bus disconnecting link of the connection strings is operated to a closing state;
connecting a high-voltage end of the alternating-current withstand voltage test equipment to the first bus group or the second bus group, and performing pressurizing operation on the three-phase bus;
the full-field breaker fracture alternating current withstand voltage test is completed through manual hanging of the temporary grounding wire and switching operation of the breaker.
By adopting the technical scheme, under the condition that a test device is not moved, after the alternating current withstand voltage of 3 groups of breaker fracture of the test string is completed, other test strings are exchanged with the current test string, and finally the test string is exchanged with the contact string, so that the alternating current withstand voltage test of the whole field breaker fracture is completed, and when the withstand voltage test of the whole field breaker fracture is developed, multiple disassembly and assembly test equipment and personnel mobile equipment are not needed, the field workload of staff is reduced, and the efficiency of the withstand voltage test of multiple groups of fracture is improved; meanwhile, the damage to the thread end caused by repeated disassembly and assembly of the test equipment is reduced, the stability of the test equipment is avoided, and the potential safety hazard in the test process is reduced.
The invention is further provided with: when the current capacity of the reactor is insufficient, two groups of short-circuit copper wires are installed on the bus knife switch of the contact string where the test breaker is located, and pressurizing operation is carried out only on any one single-phase or two-phase bus of A, B, C three-phase buses and any one single-phase or two-phase bus of D, E, F three-phase buses.
Through adopting above-mentioned technical scheme, when the electric current capacity of experimental reactor is not enough, operating personnel can short circuit A, B, C three-phase bus switch and D, E, F three-phase bus switch through the short circuit copper line for only to any single-phase or diphase bus in A, B, C three-phase bus and D, E, F three-phase bus in any single-phase or diphase bus add pressure can, through the quantity of adjusting the pressurization bus, the capacity of rational change sample, under 45 ~ 65 Hz's frequency, realize the condition that inductive reactance equals the capacitive reactance, reach the purpose of frequency conversion series resonance, improved the commonality and the adaptability of system.
In summary, the invention has the following beneficial effects:
1. exchanging other test strings with the current test string after the 3 groups of breaker fracture alternating current withstand voltage of the test string is completed under the condition that the test device is not moved, and finally exchanging the test string with the contact string to complete the full-field breaker fracture alternating current withstand voltage test, so that when the full-field breaker fracture withstand voltage test is carried out, multiple disassembly and assembly test equipment and personnel mobile equipment are not needed, the field workload of staff is reduced, and the efficiency of the multiple groups of fracture withstand voltage tests is improved; meanwhile, the damage to the thread ends caused by repeated disassembly and assembly of the test equipment is reduced, the stability of the test equipment is prevented from being reduced, and the potential safety hazard in the test process is reduced;
2. when the current capacity of the test reactor is insufficient, an operator can short-circuit the A, B, C three-phase bus disconnecting link and the D, E, F three-phase bus disconnecting link through short-circuit copper wires, so that the test reactor only needs to pressurize any one of the A, B, C three-phase bus, the 3562 three-phase bus and the D, E, F three-phase bus, the capacity of a test sample is reasonably changed by adjusting the number of pressurizing buses, the condition that the inductance is equal to the capacitance is realized at the frequency of 45-65 Hz, the purpose of frequency conversion series resonance is achieved, and the universality and the adaptability of the system are improved.
Drawings
FIG. 1 is an AC field wiring diagram of the present embodiment;
fig. 2 is a test wiring diagram of the present embodiment.
Reference numerals: 1. a contact string; 11. a circuit breaker; 12. a bus knife switch; 2. a first busbar set; 3. a second busbar set; 4. shorting copper wire; 5. and (5) a temporary grounding wire.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1 and fig. 2, the ac field breaker fracture ac withstand voltage test system disclosed in this embodiment includes a plurality of groups of connection strings 1, each connection string further includes two groups of bus-bar disconnecting switches, three groups of breakers 11 and four groups of breaker disconnecting switches, where the breaker disconnecting switches are always in a closing state in the breaker fracture withstand voltage test process, the breakers 11 adopt double-break breakers, and the connection strings 1 further include four groups of isolating switches in the closing state. Two ends of the plurality of groups of connecting strings 1 are respectively and electrically connected with a first bus group 2 and a second bus group 3.
The first bus group 2 comprises A, B, C three-phase buses, the second bus group 3 comprises D, E, F three-phase buses, and the A, B, C three-phase buses are respectively and sequentially and correspondingly electrically connected with D, E, F three-phase buses through the interconnecting string 1; bus disconnecting link 12 is arranged at both ends of the connecting string 1; the double-break circuit breaker is positioned between two groups of bus knife switches 12, and a temporary grounding wire 5 for grounding is hung in the middle of a break of the circuit breaker 11.
The contact string 1 is provided with two groups of short-circuit copper wires 4, and the two groups of short-circuit copper wires 4 are positioned between the two groups of bus bar disconnecting links.
The embodiment also discloses a fracture alternating-current withstand voltage test method of the alternating-current field breaker, which comprises the following steps:
firstly, bus knife switches 12 at two ends of a connecting string 1 where a test breaker is positioned are arranged in a closing state, and the test breaker 11 is disconnected;
secondly, a group of connecting strings 1 and the connecting strings 1 where the test circuit breaker 11 is positioned are selected at will to form a loop, and bus disconnecting links 12 at two ends of the connecting strings 1 are operated to a closing state;
connecting a high-voltage end of alternating-current withstand voltage test equipment to the first bus group 2 or the second bus group 3, and performing pressurizing operation on the three-phase buses;
fourthly, completing the full-field breaker 11 fracture alternating current withstand voltage test through manually hanging the temporary grounding wire 5 for a plurality of times and switching operation of the breaker 11.
When only a single-phase or double-phase bus is pressurized, firstly, corresponding electrified phases of bus disconnecting links 12 at two ends of a connecting string 1 where a test breaker is positioned are set in a closing state, and the test breaker 11 is disconnected; secondly, a group of connecting strings 1 and the connecting string 1 where the test breaker 11 is positioned are selected at will to form a loop, and only the bus disconnecting link 12 corresponding to the electrified bus in the connecting string 1 is operated to a closing state; thirdly, connecting the high-voltage end of the alternating-current withstand voltage test equipment to the electrified phase of the first bus group 2 or the second bus group 3, installing two groups of short-circuit copper wires 4 on bus knife switches 12 at two ends of a connecting string 1 where a test breaker 11 is positioned, and performing pressurizing operation on any one single-phase or double-phase bus and D, E, F of the A, B, C three-phase buses; fourthly, completing the full-field breaker 11 fracture alternating current withstand voltage test through manually hanging the temporary grounding wire 5 and the switching operation of the breaker 11.
Therefore, when the current of the test reactor meets the requirement, the bus bar disconnecting link 12 at the two ends of the connecting string 1 where the test breaker 11 is positioned is firstly set in a closing state, and the test breaker 11 is disconnected; then, a group of connecting strings 1 and the connecting string 1 where the test breaker 11 is positioned are selected at will to form a loop, and the bus disconnecting link 12 of the connecting string 1 is operated to a closing state; connecting a high-voltage end of the alternating-current withstand voltage test equipment to the first bus bar group 2 or the second bus bar group 3, and simultaneously performing pressurizing operation on the three-phase bus bars; under the condition of not moving the test device, the full-field breaker 11 fracture alternating current withstand voltage test is finally completed through switching operation and manual hanging of the temporary grounding wire 5; after the alternating current withstand voltage of the break of the 3 groups of circuit breakers 11 of the test strings is finished, exchanging other test strings with the current test string, and finally exchanging the test string with the connecting string 1 to finish the alternating current withstand voltage test of the break of the full-field circuit breaker 11.
When the current capacity of the test reactor is not satisfied, only one single-phase or double-phase bus or D, E, F three-phase bus of the A, B, C three-phase buses is pressurized, and the short copper wires 4 are arranged on the bus disconnecting link 12 of the test string, so that the A, B, C three-phase equipment in the connecting string can be electrified by only closing the bus disconnecting link corresponding to the electrified phase bus.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the essence of the present invention are intended to be included within the scope of the present invention.
Claims (1)
1. The alternating current field breaker fracture alternating current withstand voltage test method is applied to an alternating current field breaker fracture alternating current withstand voltage test system and is characterized in that,
the system comprises a plurality of groups of connecting strings (1), wherein each connecting string (1) comprises three groups of circuit breakers (11), two ends of each connecting string (1) are respectively connected with a first bus group (2) and a second bus group (3), each first bus group (2) comprises A, B, C three-phase buses, each second bus group (3) comprises D, E, F three-phase buses, and A, B, C three-phase buses are respectively and sequentially connected with D, E, F three-phase buses in a corresponding manner through the connecting strings (1); two ends of each connecting string (1) are respectively provided with a bus disconnecting link (12), and a temporary grounding wire (5) for grounding is hung in the middle of a fracture of the circuit breaker;
the method comprises the following steps:
the bus disconnecting link (12) of the connecting string (1) where the test circuit breaker is located is arranged in a closing state, and the test circuit breaker (11) is disconnected;
a group of connecting strings (1) and the connecting strings (1) where the test circuit breaker (11) are positioned are selected at will to form a loop, and bus disconnecting links (12) at two ends of the connecting strings (1) are operated to a closing state;
connecting a high-voltage end of the alternating-current withstand voltage test equipment to the first bus group (2) or the second bus group (3), and performing pressurizing operation on the three-phase buses;
completing a full-field breaker (11) fracture alternating current withstand voltage test through manually hanging a temporary grounding wire (5) and switching operation of the breaker (11);
when the current capacity of the reactor is insufficient, two groups of short-circuit copper wires (4) are arranged on a bus disconnecting link (12) of a connecting string (1) where the test circuit breaker (11) is positioned, and only any one single-phase or two-phase bus of A, B, C three-phase buses and any one single-phase or two-phase bus of D, E, F three-phase buses are pressurized.
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| CN202010392471.7A CN111596204B (en) | 2020-05-11 | 2020-05-11 | Alternating-current field breaker fracture alternating-current withstand voltage test system and method |
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| CN202010392471.7A CN111596204B (en) | 2020-05-11 | 2020-05-11 | Alternating-current field breaker fracture alternating-current withstand voltage test system and method |
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| CN111596204A CN111596204A (en) | 2020-08-28 |
| CN111596204B true CN111596204B (en) | 2023-12-12 |
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| CN114200271A (en) * | 2021-12-17 | 2022-03-18 | 中国十七冶集团有限公司 | Voltage withstanding method for ports of high-voltage cabinet circuit breakers installed in rows |
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2020
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Address after: No. 223, Kexue Avenue, Huangpu District, Guangzhou City, Guangdong Province, 510663 Patentee after: China Southern Power Grid Corporation Ultra High Voltage Transmission Company Electric Power Research Institute Country or region after: China Address before: 510663 maintenance and test center, building 2, 223, science Avenue, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee before: MAINTENANCE & TEST CENTRE, CSG EHV POWER TRANSMISSION Co. Country or region before: China |