CN111596204A - 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
- Publication number
- CN111596204A CN111596204A CN202010392471.7A CN202010392471A CN111596204A CN 111596204 A CN111596204 A CN 111596204A CN 202010392471 A CN202010392471 A CN 202010392471A CN 111596204 A CN111596204 A CN 111596204A
- Authority
- CN
- China
- Prior art keywords
- alternating current
- bus
- test
- phase
- contact
- 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
- 238000012360 testing method Methods 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title abstract description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052802 copper Inorganic materials 0.000 claims description 12
- 239000010949 copper Substances 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 5
- 239000003990 capacitor Substances 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Images
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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Gas-Insulated Switchgears (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (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 contact strings, wherein each contact string comprises three groups of breakers, two ends of each group of contact strings 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 correspondingly connected with D, E, F three-phase buses through the contact strings; and bus disconnecting links are respectively arranged at two ends of each contact string, 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 resistance test on a plurality of groups of fractures is improved; meanwhile, the stability of the test equipment is prevented from being reduced, and potential safety hazards in the test process are reduced.
Description
Technical Field
The invention belongs to the technical field of circuit breakers, and particularly relates to a system and a method for testing alternating current withstand voltage of a fracture of an alternating current field circuit breaker.
Background
The 500kV alternating current field of a large-scale transformer substation generally adopts a wiring mode of double buses 3/4, the alternating current field is divided into a plurality of contact strings, each contact 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 on-off voltage, each break is connected with a voltage-sharing capacitor in parallel, and the wiring mode is as shown in figure 1. When the alternating-current withstand voltage test is carried out on the breaker fracture, the alternating-current withstand voltage test between the voltage-sharing capacitors is carried out at the same time, and the voltage-sharing capacitors must adopt similar power frequency (45-65 Hz) during the withstand voltage test, so the similar power frequency voltage is used during the fracture withstand voltage test. The power frequency is generally adopted to adjust the sense series resonance device and carry out the circuit breaker fracture AC withstand voltage test in the engineering in the past, when carrying out the fracture withstand voltage test to a set of circuit breaker, pressurize in the middle of the circuit breaker fracture, fracture both sides ground connection, how many groups of circuit breakers of alternating current field, how many times the experiment will be divided go on, dismouting test equipment work load is very big, and test equipment removes comparatively troublesome.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an alternating current withstand voltage test system and method for the fracture of the alternating current field circuit breaker, which have the advantages of reducing test workload and improving the efficiency of withstand voltage tests on multiple groups of fractures.
In order to achieve the purpose, the invention provides the following technical scheme:
a fracture alternating-current withstand voltage test system of an alternating-current field breaker comprises a plurality of groups of contact strings (1), wherein each contact string comprises three groups of breakers, two ends of each group of contact strings (1) 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 correspondingly connected with D, E, F three-phase buses through the contact strings; and bus disconnecting links are respectively arranged at two ends of each contact string, 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 the test device is not moved, after the alternating-current withstand voltage of 3 groups of breaker fractures 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 to complete the alternating-current withstand voltage test of the fractures of the full-field breaker; meanwhile, the damage of the wire end caused by repeated disassembly and assembly of the test equipment is reduced, the reduction of the stability of the test equipment is avoided, and the potential safety hazard in the test process is reduced.
The invention is further configured to: the contact string is provided with two sets of short circuit copper lines, and is two sets of the short circuit copper line is located between two sets of the generating line switch.
Through adopting above-mentioned technical scheme, when the current capacity of experimental reactor is not enough, operating personnel can be through the short circuit copper line with A, B, C three-phase bus disconnecting link and D, E, F three-phase bus disconnecting link short circuit for only to any single-phase or diphase bus in A, B, C three-phase bus and any single-phase or diphase bus in D, E, F three-phase bus pressurize can, through the quantity of adjustment pressurization bus, the capacity of reasonable change test article, under 45 ~ 65Hz frequency, realize that inductive reactance equals the condition of capacitive reactance, reach the purpose of frequency conversion series resonance, the commonality and the adaptability of system have been improved.
An alternating current field breaker fracture alternating current withstand voltage test method comprises the following steps:
setting the bus disconnecting links of the contact string where the test circuit breaker is located in a closing state, and disconnecting the test circuit breaker;
randomly selecting a group of contact strings and the contact string where the test circuit breaker is located to form a loop, and operating a bus disconnecting link of the contact strings to a closing state;
connecting a high-voltage end of the alternating-current withstand voltage test equipment to the first bus bar group or the second bus bar group, and carrying out pressurization operation on the three-phase bus bar;
and the alternating-current withstand voltage test of the fracture of the full-field circuit breaker is completed through manual hanging of a temporary grounding wire and switching operation of the circuit breaker.
By adopting the technical scheme, under the condition that the test device is not moved, after the alternating-current withstand voltage of 3 groups of breaker fractures 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 to complete the alternating-current withstand voltage test of the fractures of the full-field breaker; meanwhile, the damage of the wire end caused by repeated disassembly and assembly of the test equipment is reduced, the reduction of the stability of the test equipment is avoided, and the potential safety hazard in the test process is reduced.
The invention is further configured to: when the current capacitance of the reactor is insufficient, two groups of short-circuit copper wires are installed on a bus disconnecting link of a communication string where the test circuit breaker is located, and only any single-phase or double-phase bus of A, B, C three-phase buses and any single-phase or double-phase bus of D, E, F three-phase buses are subjected to pressurization operation.
Through adopting above-mentioned technical scheme, when the current capacity of experimental reactor is not enough, operating personnel can be through the short circuit copper line with A, B, C three-phase bus disconnecting link and D, E, F three-phase bus disconnecting link short circuit for only to any single-phase or diphase bus in A, B, C three-phase bus and any single-phase or diphase bus in D, E, F three-phase bus pressurize can, through the quantity of adjustment pressurization bus, the capacity of reasonable change test article, under 45 ~ 65Hz frequency, realize that inductive reactance equals the condition of capacitive reactance, reach the purpose of frequency conversion series resonance, the commonality and the adaptability of system have been improved.
In conclusion, the invention has the following beneficial effects:
1. according to the method, under the condition that a test device is not moved, after the alternating-current withstand voltage of 3 groups of breaker fractures of a test string is completed, other test strings are exchanged with the current test string, and finally the test strings are exchanged with a contact string, so that the alternating-current withstand voltage test of the fractures of the full-field breaker is completed, and when the withstand voltage pressure test of the fractures of the full-field breaker is carried out, a test device and a personnel moving device do not need to be disassembled and assembled for many times, the field workload of workers is reduced, and the efficiency of the withstand voltage test of a plurality of groups of fractures is improved; meanwhile, the damage of the wire end caused by the repeated assembly and disassembly of the test equipment is reduced, the reduction of the stability of the test equipment is avoided, 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 A, B, C three-phase bus disconnecting link and D, E, F three-phase bus disconnecting link through a short-circuit copper wire, so that only any one of A, B, C three-phase buses or any one of the two-phase buses and D, E, F three-phase buses is pressurized, the capacity of a test article is reasonably changed by adjusting the number of the pressurized buses, the condition that inductive reactance is equal to capacitive reactance is realized under the frequency of 45-65 Hz, the purpose of variable-frequency series resonance is achieved, and the universality and the adaptability of the system are improved.
Drawings
FIG. 1 is a diagram of an AC field wiring 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 disconnecting link; 2. a first bus bar group; 3. a second bus bar group; 4. short-circuit copper wires; 5. and 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 contact strings 1, each contact string further includes two groups of bus disconnecting links, three groups of circuit breakers 11 and four groups of circuit breaker disconnecting links, wherein the circuit breaker disconnecting links are in a closing state all the time in the breaker fracture withstand voltage test process, the circuit breakers 11 adopt double-break circuit breakers, and the contact string 1 further includes four groups of disconnecting switches in a closing state. The two ends of the plurality of groups of the connecting strings 1 are respectively and electrically connected with a first bus group 2 and a second bus group 3.
The first bus bar group 2 comprises A, B, C three-phase buses, the second bus bar group 3 comprises D, E, F three-phase buses, and the A, B, C three-phase buses are respectively and correspondingly electrically connected with the D, E, F three-phase buses through the interconnection strings 1; both ends of the contact string 1 are provided with bus disconnecting links 12; the double-break circuit breaker is positioned between the two groups of bus disconnecting links 12, and a temporary grounding wire 5 for grounding is hung in the middle of a break of the circuit breaker 11.
Two sets of short circuit copper lines 4 are installed to contact string 1, and two sets of short circuit copper lines 4 are located two sets of between the generating line switch.
The embodiment also discloses an alternating current withstand voltage test method for the fracture of the alternating current field breaker, which comprises the following steps:
firstly, the bus disconnecting links 12 at two ends of the contact string 1 where the test circuit breaker is located are both set in a closing state, and the test circuit breaker 11 is disconnected;
secondly, a group of contact strings 1 and the contact string 1 where the test circuit breaker 11 is located are selected to form a loop, and the bus disconnecting links 12 at the two ends of the contact strings 1 are operated to be in a closing state;
thirdly, connecting the 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 carrying out pressurization operation on the three-phase bus bar;
fourthly, the alternating-current withstand voltage test of the fracture of the full-field circuit breaker 11 is completed through manual hanging of the temporary grounding wire 5 for multiple times and switching operation of the circuit 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 contact string 1 where a test circuit breaker is located are set in a closing state, and the test circuit breaker 11 is subjected to disconnection processing; secondly, a group of contact strings 1 and the contact string 1 where the test circuit breaker 11 is located are selected to form a loop, and only a bus disconnecting link 12 corresponding to a live bus in the contact string 1 is operated to be in a closing state; thirdly, connecting the high-voltage end of the alternating-current withstand voltage test equipment to the charged phase of the first bus bar group 2 or the second bus bar group 3, installing two groups of short-circuit copper wires 4 on bus disconnecting links 12 at two ends of a communication string 1 where the test circuit breaker 11 is located, and pressurizing any single-phase or double-phase bus in A, B, C three-phase buses and any single-phase or double-phase bus in D, E, F; fourthly, the alternating-current withstand voltage test of the fracture of the full-field circuit breaker 11 is completed through manual hanging of the temporary grounding wire 5 and switching operation of the circuit breaker 11.
Therefore, when the current of the test reactor meets the requirement, the bus disconnecting links 12 at the two ends of the contact string 1 where the test circuit breaker 11 is located are all set in a closing state, and the test circuit breaker 11 is disconnected; then, a group of contact strings 1 and the contact string 1 where the test circuit breaker 11 is located are selected to form a loop, and a bus disconnecting link 12 of the contact string 1 is operated to be in a closing state; connecting the 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 carrying out pressurization operation on the three-phase bus bar; under the condition that the test device is not moved, finally, the alternating current withstand voltage test of the fracture of the full-field circuit breaker 11 is completed through switching operation and manual hanging of the temporary grounding wire 5; after the alternating-current withstand voltage of the 3 groups of circuit breakers 11 of the test string is completed, other test strings are exchanged with the current test string, and finally the test strings are exchanged with the communication string 1 to complete the alternating-current withstand voltage test of the 11 fractures of the full-field circuit breakers.
When the current capacity of the test reactor is not satisfied, only one of a single-phase or double-phase bus of A, B, C three-phase buses and any one of a D, E, F three-phase bus is pressurized, a short-circuit copper wire 4 is installed on a bus disconnecting link 12 of the test string, and only a bus disconnecting link corresponding to a charged phase bus is closed, so that the A, B, C three-phase equipment in the interconnection string can be charged.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (4)
1. The utility model provides a high-voltage withstand test system is exchanged to alternating current field circuit breaker fracture, includes a plurality of groups contact cluster (1), each contact cluster (1) is including three group's circuit breakers (11), characterized by: two ends of a plurality of groups of connection strings (1) are respectively connected with a first bus bar group (2) and a second bus bar group (3), the first bus bar group (2) comprises A, B, C three-phase buses, the second bus bar group (3) comprises D, E, F three-phase buses, and A, B, C three-phase buses are respectively and correspondingly connected with D, E, F three-phase buses through the connection strings (1); and two ends of each communication 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.
2. The alternating current field breaker break alternating current withstand voltage test system of claim 1, characterized by: the contact string (1) is provided with two groups of short circuit copper wires (4), and the short circuit copper wires (4) are located between the two groups of bus disconnecting links (12).
3. An alternating current field breaker fracture alternating current withstand voltage test method is applied to the alternating current field breaker fracture alternating current withstand voltage test system of claim 2, and is characterized by comprising the following steps:
setting the bus disconnecting links (12) of the contact string (1) where the test circuit breaker is located in a closing state, and disconnecting the test circuit breaker (11);
a group of contact strings (1) and the contact string (1) where the test circuit breaker (11) is located are selected to form a loop, and bus disconnecting links (12) at two ends of the contact strings (1) are operated to be in a closing state;
connecting the high-voltage end of the alternating-current voltage withstand test equipment to the first bus bar group (2) or the second bus bar group (3), and carrying out pressurization operation on the three-phase bus bar;
the alternating current withstand voltage test of the fracture of the full-field circuit breaker (11) is completed through manual hanging of the temporary grounding wire (5) and switching operation of the circuit breaker (11).
4. The alternating current field breaker breaking alternating current withstand voltage test method according to claim 3, characterized in that when the current capacity of the reactor is insufficient, two groups of short-circuited copper wires (4) are installed on the bus disconnecting link (12) of the interconnection string (1) where the test breaker (11) is located, and only any one-phase or two-phase bus of A, B, C three-phase buses and any one-phase or two-phase bus of D, E, F three-phase buses are subjected to pressurization operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010392471.7A CN111596204B (en) | 2020-05-11 | 2020-05-11 | Alternating-current field breaker fracture alternating-current withstand voltage test system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010392471.7A CN111596204B (en) | 2020-05-11 | 2020-05-11 | Alternating-current field breaker fracture alternating-current withstand voltage test system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111596204A true CN111596204A (en) | 2020-08-28 |
| CN111596204B CN111596204B (en) | 2023-12-12 |
Family
ID=72185240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010392471.7A Active CN111596204B (en) | 2020-05-11 | 2020-05-11 | Alternating-current field breaker fracture alternating-current withstand voltage test system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111596204B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001343436A (en) * | 2000-05-31 | 2001-12-14 | Fuji Electric Co Ltd | Withstand voltage testing method of breaker |
| JP2010049988A (en) * | 2008-08-22 | 2010-03-04 | Chugoku Electric Power Co Inc:The | Uninterruptive testing device of wiring circuit breaker |
| CN101672890A (en) * | 2009-10-14 | 2010-03-17 | 西北电网有限公司 | Testing device of switching-on resistance of portable beaker |
| CN101865968A (en) * | 2010-05-26 | 2010-10-20 | 攀枝花电业局 | Breaker vacuum pipe fracture alternative-current withstand voltage test platform |
| CN205720536U (en) * | 2016-04-29 | 2016-11-23 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Alternating current filter breaker alternating current-direct current mixes pressure connection circuit |
| CN205863657U (en) * | 2016-08-10 | 2017-01-04 | 上海国孚电力设计工程股份有限公司 | 220kV double bus scheme transmission line circuit wiring optimizes structure |
| CN206178000U (en) * | 2016-11-11 | 2017-05-17 | 广西电网有限责任公司贵港供电局 | High voltage circuit breaker auxiliary device for testing |
-
2020
- 2020-05-11 CN CN202010392471.7A patent/CN111596204B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001343436A (en) * | 2000-05-31 | 2001-12-14 | Fuji Electric Co Ltd | Withstand voltage testing method of breaker |
| JP2010049988A (en) * | 2008-08-22 | 2010-03-04 | Chugoku Electric Power Co Inc:The | Uninterruptive testing device of wiring circuit breaker |
| CN101672890A (en) * | 2009-10-14 | 2010-03-17 | 西北电网有限公司 | Testing device of switching-on resistance of portable beaker |
| CN101865968A (en) * | 2010-05-26 | 2010-10-20 | 攀枝花电业局 | Breaker vacuum pipe fracture alternative-current withstand voltage test platform |
| CN205720536U (en) * | 2016-04-29 | 2016-11-23 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Alternating current filter breaker alternating current-direct current mixes pressure connection circuit |
| CN205863657U (en) * | 2016-08-10 | 2017-01-04 | 上海国孚电力设计工程股份有限公司 | 220kV double bus scheme transmission line circuit wiring optimizes structure |
| CN206178000U (en) * | 2016-11-11 | 2017-05-17 | 广西电网有限责任公司贵港供电局 | High voltage circuit breaker auxiliary device for testing |
Non-Patent Citations (2)
| Title |
|---|
| 高立超 等: "330KVGIS设备现场交流耐压试验击穿故障分析", 《电气技术》 * |
| 高立超 等: "330KVGIS设备现场交流耐压试验击穿故障分析", 《电气技术》, no. 8, 30 August 2016 (2016-08-30), pages 86 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111596204B (en) | 2023-12-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112731210B (en) | Main transformer electrical preventive test method without dismantling high-voltage side GIS | |
| CN101888070B (en) | 10KV bypass cable operation method | |
| CN109347134B (en) | Bipolar flexible direct-current power grid polar line electric main wiring system and online maintenance method | |
| CN110277771B (en) | Method for improving short-circuit current breaking capacity of transformer substation in T connection mode | |
| CN111596204B (en) | Alternating-current field breaker fracture alternating-current withstand voltage test system and method | |
| CN207637603U (en) | A kind of automatic capacity transfer type distribution transformer | |
| CN213585610U (en) | High-power synchronous motor starting system | |
| CN111239601B (en) | Method for detecting double-break bus isolating switch in 220 KV power transformation combined electrical equipment | |
| CN110445044B (en) | Transformation station transformation method for single-bus operation | |
| CN201673841U (en) | Outdoor quadrupolar linkage disconnector | |
| CN113325305A (en) | 500kV circuit breaker high-voltage electrical test wiring device and use method thereof | |
| CN210443803U (en) | 220kV HGIS power distribution device applied to single bus sectional wiring of transformer substation | |
| CN107482523A (en) | Double bus scheme GIS device and its repair method, pressure test method | |
| CN208461317U (en) | All insulation type voltage transformer GIS cabinet | |
| CN111668791B (en) | DC serial ice melting device and system | |
| CN108281917B (en) | Extra-high voltage alternating current transformer substation and design method thereof | |
| CN210269931U (en) | Operation control power supply circuit based on micro switch | |
| CN216052152U (en) | Voltage transformer characteristic test box | |
| CN211528661U (en) | Energy-saving electrical phase sequence test system | |
| CN214755553U (en) | Battery energy storage, current transformation and voltage boosting device | |
| CN215728740U (en) | Converter station converter transformer short circuit test device | |
| CN213279163U (en) | Arc suppression coil capacity increasing system of power distribution network | |
| CN109738843B (en) | Pi-type equivalent circuit network for simulating complex distribution line | |
| CN217085197U (en) | Circuit for rapidly detecting circuit breaker interval loop resistance and circuit breaker dynamic characteristic | |
| CN203707584U (en) | Capacitor loop applied to substation and substation |
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 |