CN111342378B - Temporary unlocking tool and method for switch cabinet insulation measurement - Google Patents
Temporary unlocking tool and method for switch cabinet insulation measurement Download PDFInfo
- Publication number
- CN111342378B CN111342378B CN202010250976.XA CN202010250976A CN111342378B CN 111342378 B CN111342378 B CN 111342378B CN 202010250976 A CN202010250976 A CN 202010250976A CN 111342378 B CN111342378 B CN 111342378B
- Authority
- CN
- China
- Prior art keywords
- switch cabinet
- operating handle
- switch
- connecting rod
- unlocking tool
- 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.)
- Active
Links
- 238000009413 insulation Methods 0.000 title claims abstract description 37
- 238000005259 measurement Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000006378 damage Effects 0.000 abstract description 4
- 210000002105 tongue Anatomy 0.000 description 13
- 230000007547 defect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000013095 identification testing Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Patch Boards (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention belongs to the technical field of electrical equipment of nuclear power plants, and particularly relates to a temporary unlocking tool for insulation measurement of a switch cabinet and an unlocking method. The unlocking tool is small and exquisite and flexible, convenient to carry and simple in operation method, solves the problem that the grounding switch is damaged by operating the grounding switch in the insulation process, prolongs the service life of the position indicator, effectively reduces maintenance workload, reduces the unavailability of the switch cabinet caused by maintenance power failure, improves the operation reliability of a power system of a factory, effectively matches with the interlocking mechanism of the switch cabinet, has high fit degree, and does not have the problem of incomplete operation or improper damage to the interlocking mechanism.
Description
Technical Field
The invention belongs to the technical field of electrical equipment of nuclear power plants, and particularly relates to a temporary unlocking tool and method for insulation measurement of a switch cabinet.
Background
The medium-voltage switch cabinet is used as a general switch cabinet, and when the cable chamber cabinet door is opened, the five-prevention design considers that the grounding switch cannot be operated, and the grounding switch is at the opening position, and the cable chamber cabinet door cannot be opened. On the switch cabinet structure, when the cable chamber cabinet door is opened, a locking tongue piece at the grounding switch operation hole pops up from the square hole of the position indicator to prevent the insertion of the operation handle, otherwise, the cable chamber cabinet door is closed, the locking tongue piece retracts from the square hole of the position indicator, and after the grounding switch is opened, the cable chamber cabinet door is locked, wherein the position indicator is made of plastic materials, and the locking tongue piece is made of metal materials.
During the operation or maintenance of the unit, the insulation measurement before the medium voltage load equipment is put into operation, periodically switched, functional verification test and quality re-identification test after repair is measured under the condition that the bus of the switch cabinet is electrified, and the insulation risk of the load is extremely high during the measurement in the breaker chamber of the switch cabinet, so that the medium voltage load equipment is selectively executed at the cable chamber side, and the specific operation steps are as follows: positioning the circuit breaker in an isolated position; closing the grounding switch, taking down the operating handle, and opening the cable chamber door; the cable chamber door is virtually masked, locking tongues at the operation holes are removed, and an operation handle is inserted; opening a cable chamber door, operating a grounding switch to open a gate, and executing insulation measurement work; and after the insulation measurement is finished, switching on the grounding switch, taking down the operating handle, and closing the cabinet door.
Although the insulation is measured by operating the grounding switch when the cable chamber door is opened in the operation mode, normal ejection of the locking tongue piece after the cable chamber door is opened is omitted, when the position indicator rotates along with the grounding switch driving rod, the ejected locking tongue piece always abuts against the position indicator and scratches the position indicator, the position indicator is scratched and scratched repeatedly for a plurality of times, even the position indicator is offset due to stress, the position indicator indicates an error, if the position indicator indicates a brake separating state, and the grounding switch body is actually a closing position, so that the operator misjudges. According to the overhaul and daily defect statistics of No. 1 and No. 2 units in 2012-2016 period, the damage rate of the grounding switch position indicator of the medium-voltage switch cabinet is as high as more than 76%.
Therefore, a temporary unlocking tool for insulation measurement of a switch cabinet needs to be designed, and the position indicator of the grounding switch can be prevented from being damaged in the insulation measurement mode of a cable chamber of the switch cabinet, so that the defects in the prior art are overcome.
Disclosure of Invention
The invention aims to provide a temporary unlocking tool and an unlocking method for switch cabinet insulation measurement, which aim at overcoming the defects of the prior art, and can temporarily release a locking tongue piece at a grounding switch operation hole when insulation is measured in a cable chamber of a switch cabinet, so that the locking tongue piece cannot directly damage a position indicator in the process of opening a cable chamber door to operate the grounding switch.
The technical scheme of the invention is as follows:
the utility model provides a switch cabinet insulation measurement is with interim unblock instrument, this instrument includes operating handle, rotatable connecting rod, fixed pin and U type groove, and operating handle and rotatable connecting rod connect, rotatable connecting rod front end and U type tank bottom fixed connection.
The operating handle is fixedly connected with the rotatable connecting rod through a fixing pin.
The operating handle is integrally machined, a hollow through structure is arranged in the operating handle, a double-wing baffle and an anti-falling convex round table are machined in the front half part of the operating handle, and the rear half part of the operating handle is a cylinder.
The operating handle, the rotatable connecting rod and the U-shaped groove are made of stainless steel.
The front end of the double-wing type baffle plate on the operating handle is provided with a fixing pin mounting hole, and the diameter of the fixing pin mounting hole is smaller than the inner diameter of the operating handle.
The rotatable connecting rod is of a concentric cylinder structure.
The fixing pin is embedded in the fixing pin mounting hole at the front end of the double-wing type baffle plate in an interference manner.
The front end of the rotatable connecting rod is embedded and installed on the U-shaped groove in an interference mode.
The temporary unlocking method for the insulation measurement of the switch cabinet specifically comprises the following steps:
after the grounding switch is switched on, opening a cabinet door of the switch cabinet, and clamping the unlocking tool on a circular shaft of the unlocking fan-shaped piece through a rectangular operation hole of the switch cabinet by a U-shaped groove clamp; pushing the unlocking tool to the inner side of the rectangular operation hole of the switch cabinet until the locking tongue piece is completely separated from the position indicator, and completely entering the rectangular operation hole of the switch cabinet by the double-wing type baffle piece;
and (2) rotating the operating handle clockwise or anticlockwise by 90 degrees, utilizing the spring force of the locking tongue piece, after releasing the operating handle, fixing the double-wing type baffle on the switch cabinet, operating the grounding switch to open the gate, executing insulation resistance measurement, operating the grounding switch to open the gate, rotating the operating handle clockwise or anticlockwise by 90 degrees, taking out the unlocking tool, and ending the insulation resistance measurement of the switch cabinet.
The invention has the following beneficial effects:
(1) The invention provides a novel temporary unlocking tool for switch cabinet insulation measurement, which solves the problem that a grounding switch is damaged by operating the grounding switch in the insulation measurement process, and prolongs the service life of the grounding switch.
(2) The invention effectively reduces the maintenance workload, reduces the unavailability of the switch cabinet caused by maintenance power failure, and improves the operation reliability of the station service power system.
(3) The operation handle of the temporary unlocking tool for the insulation measurement of the switch cabinet is provided with the anti-falling protruding cylinder, so that the switch cabinet is prevented from falling in the using process of the tool.
(4) After the operation is finished, the cabinet door can be closed only by taking down the temporary unlocking tool for insulation measurement of the switch cabinet, and the inside of the switch cabinet is prevented from being left.
(5) The invention effectively matches the interlocking mechanism of the switch cabinet, has high fitting degree, and does not have the problems of incomplete operation or improper injury of the interlocking mechanism.
(6) The invention is small and flexible, convenient to carry and simple in operation method.
Drawings
FIG. 1 is a front view of a temporary unlocking tool for insulation measurement of a switch cabinet, designed by the invention;
FIG. 2 is a top view of a temporary unlocking tool for insulation measurement of a switch cabinet according to the present invention;
FIG. 3 is a cross-sectional view of a temporary unlocking tool for insulation measurement of a switchgear according to the present invention;
fig. 4 is a schematic operation diagram of a temporary unlocking tool for insulation measurement of a switch cabinet according to the present invention.
Wherein: 1-operation handle, 2-rotatable connecting rod, 3-fixed pin, 4-U-shaped groove, 5-anti-falling raised round table, 6-double-wing baffle, 7-rectangular operation hole of switch cabinet, 8-position indicator, 9-locking tongue piece, 10-unlocking fan-shaped piece and 11-switch cabinet
Detailed Description
The technology of the present invention is further described below:
as shown in fig. 1, 2 and 3, the present invention provides a temporary unlocking tool for insulation measurement of a switchgear, which comprises an operation handle 1, a rotatable connecting rod 2, a fixing pin 3 and a U-shaped groove 4. The fixed pin 3 is embedded into the mounting hole of the operating handle 1 in an interference manner, the rotatable connecting rod 2 is fixed on the operating handle 1, and the front end of the rotatable connecting rod 2 is embedded into the mounting hole at the bottom of the U-shaped groove 4 in an interference manner.
The operation handle 1 mainly aims at fixing and rotating the whole tool, the operation handle 1 is integrally machined, the inside of the operation handle is of a hollow through structure, a double-wing baffle 6 and an anti-falling boss round table 5 are machined on the front half part of the operation handle, and the rear half part of the operation handle 1 is a cylinder and is used for holding and operating.
The front end of the double-wing type baffle sheet 6 on the operating handle 1 is provided with a fixing pin mounting hole, and the diameter of the fixing pin mounting hole is smaller than the inner diameter of the operating handle 1.
The operating handle 1, the rotatable connecting rod 2 and the U-shaped groove 4 are made of stainless steel materials, so that sufficient mechanical strength is ensured and corrosion is prevented.
The U-shaped groove 4 is mainly used for clamping on a circular shaft of the unlocking sector piece 10, moving and changing the position of the unlocking sector piece 10. The rotatable connecting rod 2 is of a concentric cylinder structure, the rotatable connecting rod 2 is fixed inside the operating handle 1 through the fixing pin 3, the connecting rod can be guaranteed to rotate randomly along the axial direction, the fixing pin 3 is embedded with the mounting hole of the operating handle 1 in an interference mode, and the front end of the connecting rod of the rotatable connecting rod 2 is embedded and mounted on the U-shaped groove 4 in an interference mode.
As shown in fig. 4, the invention further provides a temporary unlocking method for insulation measurement of a switch cabinet, which specifically comprises the following steps:
after the grounding switch is switched on, opening a cabinet door of the switch cabinet 11, and clamping the unlocking tool on a circular shaft of the unlocking fan-shaped piece 10 through the rectangular operation hole 7 of the switch cabinet by the U-shaped groove 4; pushing the unlocking tool to the inner side of the rectangular operation hole 7 of the switch cabinet until the locking tongue piece 9 is completely separated from the position indicator 8, and the double-wing type baffle 6 completely enters the rectangular operation hole 7 of the switch cabinet;
and (2) rotating the operating handle 1 clockwise or anticlockwise by 90 degrees, loosening the operating handle by utilizing the self spring force of the locking tongue piece 9, fixing the double-wing baffle 6 on the switch cabinet 11, operating the grounding switch to open the gate, executing insulation resistance measurement, operating the grounding switch to open the gate, rotating the operating handle 1 clockwise or anticlockwise by 90 degrees, taking out the unlocking tool, and finishing the insulation resistance measurement of the switch cabinet.
The present invention has been described in detail with reference to the embodiments, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The invention may be practiced otherwise than as specifically described.
Claims (5)
1. A switch cabinet insulation measurement is with interim unblock instrument which characterized in that: the tool comprises an operating handle (1), a rotatable connecting rod (2), a fixing pin (3) and a U-shaped groove (4), wherein the operating handle (1) is connected with the rotatable connecting rod (2), and the front end of the rotatable connecting rod (2) is connected with the U-shaped groove (4);
the operating handle (1) is fixedly connected with the rotatable connecting rod (2) through a fixing pin (3);
the operating handle (1) is integrally machined, a hollow through structure is arranged in the operating handle, a double-wing baffle (6) and an anti-falling convex round table (5) are machined on the front half part of the operating handle, and the rear half part of the operating handle is a cylinder;
the fixing pin (3) is embedded in a fixing pin mounting hole at the front end of the double-wing baffle (6) in an interference manner;
the front end of the connecting rod of the rotatable connecting rod (2) is embedded and arranged on the U-shaped groove (4) in an interference manner.
2. The temporary unlocking tool for insulation measurement of a switch cabinet according to claim 1, wherein: the operating handle (1), the rotatable connecting rod (2) and the U-shaped groove (4) are made of stainless steel.
3. The temporary unlocking tool for insulation measurement of a switch cabinet according to claim 2, wherein: the front end of the double-wing type baffle sheet (6) on the operating handle (1) is provided with a fixing pin mounting hole, and the diameter of the fixing pin mounting hole is smaller than the inner diameter of the operating handle (1).
4. A temporary unlocking tool for insulation measurement of a switchgear according to claim 3, wherein: the rotatable connecting rod (2) is of a concentric cylinder structure.
5. The unlocking method of a temporary unlocking tool for insulation measurement of a switchgear according to any one of claims 1 to 4, characterized in that it comprises the following steps:
after the grounding switch of the step (1) is switched on, opening a cabinet door of the switch cabinet (11), and clamping the unlocking tool on a circular shaft of the unlocking sector piece (10) through a rectangular operation hole (7) of the switch cabinet by a U-shaped groove (4); pushing the unlocking tool to the inner side of the rectangular operation hole (7) of the switch cabinet until the locking tongue piece (9) is completely separated from the position indicator (8), and at the moment, the double-wing type baffle piece (6) completely enters the rectangular operation hole (7) of the switch cabinet;
and (2) rotating the operating handle (1) clockwise or anticlockwise by 90 degrees, using the self spring force of the locking tongue piece (9), loosening hands to fix the double-wing type baffle piece (6) on the switch cabinet (11), operating the grounding switch to open the switch, executing insulation resistance measurement, operating the grounding switch to open the switch, rotating the operating handle (1) clockwise or anticlockwise by 90 degrees, taking out the unlocking tool, and ending the insulation resistance measurement of the switch cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010250976.XA CN111342378B (en) | 2020-04-01 | 2020-04-01 | Temporary unlocking tool and method for switch cabinet insulation measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010250976.XA CN111342378B (en) | 2020-04-01 | 2020-04-01 | Temporary unlocking tool and method for switch cabinet insulation measurement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111342378A CN111342378A (en) | 2020-06-26 |
| CN111342378B true CN111342378B (en) | 2024-03-19 |
Family
ID=71184483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010250976.XA Active CN111342378B (en) | 2020-04-01 | 2020-04-01 | Temporary unlocking tool and method for switch cabinet insulation measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111342378B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114628174B (en) * | 2022-02-15 | 2023-08-15 | 江苏核电有限公司 | Self-adaptive unlocking device of electrical switch cabinet |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295857A (en) * | 2007-04-28 | 2008-10-29 | 上海市电力公司 | Hook type tool for low-tension switch cabinet bypass cross-over connection, and manufacturing technique thereof |
| CN101300397A (en) * | 2005-11-07 | 2008-11-05 | 希科洛普公司 | Mechanism for installing a control turning handle of a door lock and its deinstalling tool |
| CN101702382A (en) * | 2009-11-18 | 2010-05-05 | 中国西电电气股份有限公司 | Mechanical interlocking device of disconnecting switch and grounding switch |
| CN201584319U (en) * | 2009-12-28 | 2010-09-15 | 厦门明翰电气有限公司 | Anti-maloperation locking device of medium-pressure switch cabinet grounding switch |
| CN104582530A (en) * | 2012-04-23 | 2015-04-29 | 乔舒亚·迈克尔·扬 | Methods and devices and systems for positioning input devices and creating control signals |
| CN205159149U (en) * | 2015-11-17 | 2016-04-13 | 浙江德驰电务股份有限公司 | Looped netowrk cabinet earthing switch door interlock |
| CN106639648A (en) * | 2015-11-03 | 2017-05-10 | 国网山东莒南县供电公司 | High-voltage switch cabinet capable of preventing trip due to false touch for transformer substation |
| CN206893521U (en) * | 2017-07-04 | 2018-01-16 | 河南森源电气股份有限公司 | A kind of switch cubicle and its earthed switch operation handle anti-misoperation locking device |
| CN207009392U (en) * | 2017-07-11 | 2018-02-13 | 四川汇友电气有限公司 | The powered handling instrument of high-tension fuse |
| KR20180038680A (en) * | 2016-10-07 | 2018-04-17 | 한국전력공사 | System for prevent mal-operation of power facilities |
| CN209766275U (en) * | 2019-06-17 | 2019-12-10 | 山东泰开真空开关有限公司 | XGN2-12 breaker cabinet electrical interlocking device |
| CN209948504U (en) * | 2019-06-06 | 2020-01-14 | 国网江苏省电力有限公司南京供电分公司 | Cable T type terminal blanking cover installs and removes instrument |
| CN211743860U (en) * | 2020-04-01 | 2020-10-23 | 江苏核电有限公司 | Cubical switchboard insulation measurement is with interim unblock instrument |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2973902B1 (en) * | 2013-03-14 | 2019-09-18 | Schneider Electric USA, Inc. | Independent shutter system for rack-in breakers |
-
2020
- 2020-04-01 CN CN202010250976.XA patent/CN111342378B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101300397A (en) * | 2005-11-07 | 2008-11-05 | 希科洛普公司 | Mechanism for installing a control turning handle of a door lock and its deinstalling tool |
| CN101295857A (en) * | 2007-04-28 | 2008-10-29 | 上海市电力公司 | Hook type tool for low-tension switch cabinet bypass cross-over connection, and manufacturing technique thereof |
| CN101702382A (en) * | 2009-11-18 | 2010-05-05 | 中国西电电气股份有限公司 | Mechanical interlocking device of disconnecting switch and grounding switch |
| CN201584319U (en) * | 2009-12-28 | 2010-09-15 | 厦门明翰电气有限公司 | Anti-maloperation locking device of medium-pressure switch cabinet grounding switch |
| CN104582530A (en) * | 2012-04-23 | 2015-04-29 | 乔舒亚·迈克尔·扬 | Methods and devices and systems for positioning input devices and creating control signals |
| CN106639648A (en) * | 2015-11-03 | 2017-05-10 | 国网山东莒南县供电公司 | High-voltage switch cabinet capable of preventing trip due to false touch for transformer substation |
| CN205159149U (en) * | 2015-11-17 | 2016-04-13 | 浙江德驰电务股份有限公司 | Looped netowrk cabinet earthing switch door interlock |
| KR20180038680A (en) * | 2016-10-07 | 2018-04-17 | 한국전력공사 | System for prevent mal-operation of power facilities |
| CN206893521U (en) * | 2017-07-04 | 2018-01-16 | 河南森源电气股份有限公司 | A kind of switch cubicle and its earthed switch operation handle anti-misoperation locking device |
| CN207009392U (en) * | 2017-07-11 | 2018-02-13 | 四川汇友电气有限公司 | The powered handling instrument of high-tension fuse |
| CN209948504U (en) * | 2019-06-06 | 2020-01-14 | 国网江苏省电力有限公司南京供电分公司 | Cable T type terminal blanking cover installs and removes instrument |
| CN209766275U (en) * | 2019-06-17 | 2019-12-10 | 山东泰开真空开关有限公司 | XGN2-12 breaker cabinet electrical interlocking device |
| CN211743860U (en) * | 2020-04-01 | 2020-10-23 | 江苏核电有限公司 | Cubical switchboard insulation measurement is with interim unblock instrument |
Non-Patent Citations (2)
| Title |
|---|
| 6kV开关接地刀闸室柜门闭...指示器失效的原因分析及处理;莫敏;电工技术(第24期);第11-12页 * |
| 对10kV ABB开关柜防误闭锁装置的完善;潘国华;电力安全技术;第14卷(第10期);第62-63页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111342378A (en) | 2020-06-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111342378B (en) | Temporary unlocking tool and method for switch cabinet insulation measurement | |
| CN211743860U (en) | Cubical switchboard insulation measurement is with interim unblock instrument | |
| CN112282535A (en) | Cabinet door fixing device for switch cabinet maintenance | |
| CN219371743U (en) | Power distribution switch cabinet of power distribution control equipment | |
| CN207529834U (en) | A kind of protective device of switch socket | |
| CN214943195U (en) | Quick replaceable safety lock | |
| CN115241018A (en) | Breaker device with data acquisition control function and use method | |
| CN208955460U (en) | A kind of distribution box of easy access | |
| CN102522236B (en) | Anti-misoperation interlocking mechanism of prefabricated substation transformer chamber door | |
| CN2911940Y (en) | Chassis interlocking gear of high voltage breaker | |
| CN219672364U (en) | Interlocking device for two locks and one key of movable high-voltage switch cabinet | |
| CN201556865U (en) | Cotter pin restorer | |
| CN112761423A (en) | Quick replaceable safety lock | |
| CN220798772U (en) | Police monitoring anti-theft equipment box | |
| CN102397829B (en) | Door clamp special for coating | |
| CN111293590A (en) | Insulating baffle for direct electricity testing of 10kV high-voltage switch cabinet | |
| CN221040931U (en) | Anti-rotation assembly and isolating switch | |
| CN215771968U (en) | Switch cabinet convenient to maintain for construction site | |
| CN111058703A (en) | Cabinet door locking device of switch cabinet | |
| CN220290689U (en) | Split crank arm of 66KV GIS isolation disconnecting link operating mechanism | |
| CN113764215B (en) | Error preventing device for manual operating mechanism of outdoor isolating switch | |
| CN219937669U (en) | Power distribution cabinet convenient to overhaul | |
| CN218386396U (en) | Valve locking device of switch cabinet | |
| CN221766476U (en) | Transformer load clamping assembly | |
| CN212907468U (en) | Opening lock for universal circuit breaker and universal circuit breaker |
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 |