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CN-122000227-A - Five-prevention mechanical interlocking mechanism of upper isolation three-station ring main unit

CN122000227ACN 122000227 ACN122000227 ACN 122000227ACN-122000227-A

Abstract

The invention relates to a five-prevention mechanical interlocking mechanism of an upper isolation three-station ring main unit, which comprises a fixed plate, a breaker closing operation shaft, a breaker opening and closing indication shaft, a grounding switch operation shaft, an isolating switch operation shaft, a first interlocking rod, a second interlocking rod, a third interlocking rod, a fourth interlocking rod, a fifth interlocking rod, a sixth interlocking rod and an interlocking deflector rod, wherein the upper end and the lower end of the first interlocking rod are correspondingly matched with the breaker opening operation shaft and a cable bin door, the upper end of the second interlocking rod is provided with an isolating shaft baffle plate, the lower end of the second interlocking rod is matched with the cable bin door, the upper end of the third interlocking rod is provided with a grounding shaft baffle plate, the upper end and the lower end of the fourth interlocking rod are correspondingly matched with the grounding switch operation shaft and the cable bin door, the right end of the fifth interlocking rod is provided with an isolating shaft baffle plate, the left end of the sixth interlocking rod is matched with the isolating switch operation shaft, and the left end of the sixth interlocking rod is connected with the first interlocking rod and the third interlocking rod.

Inventors

  • WANG QIANGHONG
  • Wu Qishen
  • Huo Daguang
  • LIU ZHIMIN
  • LU TIANYI
  • SONG JIA

Assignees

  • 北京双杰电气股份有限公司

Dates

Publication Date
20260508
Application Date
20260228

Claims (10)

  1. 1. The utility model provides an upper isolation three-station looped netowrk cabinet five-prevention mechanical interlocking mechanism, which is characterized by comprising a fixed plate (1) and a breaker closing operation shaft (2) which is arranged on the fixed plate (1) through a bearing, a breaker opening operation shaft (3), a breaker opening and closing indication shaft (4), a grounding switch operation shaft (5) and an isolating switch operation shaft (6), wherein a first interlocking rod (11), a second interlocking rod (12), a third interlocking rod (13), a fourth interlocking rod (14), a fifth interlocking rod (15) and a sixth interlocking rod (16) which are in sliding fit with the fixed plate are also arranged on the fixed plate (1), a breaking limit block (31) is fixed on the breaker opening and closing operation shaft (3), a breaking crank arm (41) and a breaking indication plate (42) are fixed on the breaker opening and closing indication shaft (4), a first breaking crank pin (43) and a second breaking crank pin (44) are correspondingly fixed on the grounding switch operation shaft (5), a first grounding crank arm (52) and a second crank arm (52) are fixed on the grounding switch operation shaft (5), and a disconnecting switch (52) is fixed on the isolating pin (52) through a disconnecting link (52), the upper end and the lower end of the first interlocking rod (11) are correspondingly matched with a brake separating limiting block (31) and a cable bin door, a first brake pin hole (121) which is matched with a first brake stirring pin (43) and is in a strip shape is arranged on the second interlocking rod (12), a first isolation shaft baffle (122) which shields an isolating switch operation shaft (6) during brake operation is arranged at the upper end of the second interlocking rod (12), the lower end of the second interlocking rod (12) is matched with the cable bin door, a third brake stirring pin is arranged at the lower end of the third interlocking rod (13), a first grounding shaft baffle (131) which shields a grounding switch operation shaft (5) during brake operation is arranged at the upper end of the third interlocking rod (13), the upper end and the lower end of the fourth interlocking rod (14) are correspondingly matched with the first grounding crank arm (51) and the cable bin door, a reset spring (7) is arranged between the fifth interlocking rod (15) and the fixed plate locking rod (1), the right end of the fifth interlocking rod (15) is matched with the grounding stirring pin (53), the left end of the fifth interlocking rod (15) is shielded with the first grounding pin (6), the first grounding pin baffle (151) is matched with the second isolation pin hole (16) in a strip shape, the left end of the sixth interlocking rod (16) is provided with a second grounding shaft baffle (162) which shields the grounding switch operating shaft (5) during isolation, the device further comprises an interlocking deflector rod (17) hinged on the fixed plate (1) through a pin shaft in the middle, one end of the interlocking deflector rod (17) is provided with a second circuit breaking pin hole (171) which is matched with the second circuit breaking deflector pin (44) and is in a strip shape, and the other end of the interlocking deflector rod (17) is provided with a third circuit breaking pin hole which is matched with the third circuit breaking deflector pin and is in a strip shape.
  2. 2. The five-prevention mechanical interlocking mechanism of the upper isolation three-station ring main unit according to claim 1, wherein the first interlocking rod (11), the second interlocking rod (12), the third interlocking rod (13), the fourth interlocking rod (14), the fifth interlocking rod (15), the sixth interlocking rod (16) and the interlocking deflector rod (17) are respectively made of PA66+30GF materials and are formed by injection molding through a mold.
  3. 3. The five-prevention mechanical interlocking mechanism of the upper isolation three-station ring main unit according to claim 2, wherein the fixed plate (1) is provided with a grounding micro switch (8) and an isolation micro switch (9), the fourth interlocking rod (14) is provided with a stop block (141) matched with the grounding micro switch (8), and the left end of the sixth interlocking rod (16) is matched with the isolation micro switch (9).
  4. 4. The five-prevention mechanical interlocking mechanism for the upper isolation three-station ring main unit according to claim 3, wherein more than two first vertical guide holes (111) are formed in the first interlocking rod (11), first guide pins (112) in the first guide holes (111) are fixed on the fixed plate (1), and flat pads and blocking cards are arranged on the first guide pins (112).
  5. 5. The five-prevention mechanical interlocking mechanism of the upper isolation three-station ring main unit according to claim 3, wherein more than two vertical second guide holes (123) are formed in the second interlocking rod (12), second guide pins (124) in the second guide holes (123) are fixed on the fixing plate (1), and flat pads and blocking cards are arranged on the second guide pins (124).
  6. 6. The five-prevention mechanical interlocking mechanism for the upper isolation three-station ring main unit according to claim 3, wherein more than two vertical third guide holes (132) are formed in the third interlocking rod (13), a third guide pin (133) positioned in the third guide holes (132) is fixed on the fixed plate (1), and a flat pad and a blocking card are arranged on the third guide pin (133).
  7. 7. The five-prevention mechanical interlocking mechanism of the upper isolation three-station ring main unit according to claim 6, wherein more than two vertical fourth guide holes (142) are formed in the fourth interlocking rod (14), fourth guide pins (143) positioned in the fourth guide holes (142) are fixed on the fixing plate (1), and flat pads and blocking cards are arranged on the fourth guide pins (143).
  8. 8. The five-prevention mechanical interlocking mechanism of the upper isolation three-station ring main unit according to claim 7, wherein the third interlocking rod (13) is stacked on the fourth interlocking rod (14), the third guide holes (132) are distributed in one-to-one correspondence with part of the fourth guide holes (142), the third guide pins (133) and the fourth guide pins (143) at corresponding positions are the same guide pins, and gaskets are sleeved on the third guide pins (133) between the third interlocking rod (13) and the fourth interlocking rod (14).
  9. 9. The five-prevention mechanical interlocking mechanism of the upper isolation three-station ring main unit according to claim 3, wherein more than two transverse fifth guide holes (152) are formed in the fifth interlocking rod (15), fifth guide pins (153) in the fifth guide holes (152) are fixed on the fixing plate (1), flat pads and blocking cards are mounted on the fifth guide pins (153), and the left end and the right end of the return spring (7) are correspondingly fixed on the fifth interlocking rod (15) and the fifth guide pins (153).
  10. 10. The five-prevention mechanical interlocking mechanism of the upper isolation three-station ring main unit according to claim 3, wherein more than two transverse sixth guide holes (163) are formed in the sixth interlocking rod (16), sixth guide pins (164) in the sixth guide holes (163) are fixed on the fixing plate (1), and flat pads and blocking cards are arranged on the sixth guide pins (164).

Description

Five-prevention mechanical interlocking mechanism of upper isolation three-station ring main unit Technical Field The invention relates to a ring main unit, in particular to a five-prevention mechanical interlocking mechanism for an upper isolation three-station ring main unit. Background Electrical accidents caused by misoperation in the power system occur, and the accidents not only can cause equipment damage, but also can cause casualties and large-area power failure. As the scale of power systems increases and the complexity increases, traditional manual operation approaches have difficulty in completely avoiding false operations. In order to meet the requirement of five-prevention, the electric power industry begins to explore various interlocking technologies such as machinery, electricity and the like, and the correctness and the safety of an operation sequence are ensured through a forced locking or prompting device. Meanwhile, the country has continuously exported related standards, such as GB 3906 series standards, clearly specifies that the metal-enclosed switchgear needs to have perfect five-prevention interlocking function, and promotes the standardization and standardization development of the five-prevention interlocking technology. Most ring main units adopt mechanical interlocking devices, such as mechanical locking between a disconnecting switch and a circuit breaker, interlocking between a grounding switch and the disconnecting switch and the like, misoperation is prevented by limiting the operation sequence through the mechanical structure, for example, when the circuit breaker is in a working position, the disconnecting switch cannot be operated, the operation of on-load switching-on and switching-off of the disconnecting switch is prevented, and part of ring main units introduce electrical interlocking, position auxiliary contacts of the circuit breaker, the disconnecting switch and the grounding switch are connected into an electrical operation loop, for example, when the circuit breaker is not switched off, a switching-on loop of the disconnecting switch is cut off, so that electrical locking is realized. However, the five-prevention interlocking of the existing upper isolation three-station ring main unit has a plurality of problems in practical application, and needs to be further improved or perfected, and is mainly characterized in that 1, part of the structures are difficult to realize interlocking, only electric interlocking is realized, and no corresponding mechanical interlocking or mechanical interlocking insufficiency exists, for example, when an isolating switch is in a switching-off state and a switching-on state of a circuit breaker, a grounding switch can be operated, and when the electric interlocking is invalid or overhauled, the danger of electric shock caused by induced electricity or residual charges is easy to occur due to misoperation. 2. Mechanical interlocking reliability problem, mechanical interlocking parts are all formed by adopting carbon steel parts, and are easily influenced by factors such as large processing error, rust, jamming and the like, so that locking failure is caused, for example, a locking connecting rod used for a long time may be broken, a lock tongue may not be normally meshed, and a disconnecting switch or a handcart is misoperation when the disconnecting switch or the handcart should not be operated. 3. The environment adaptability is limited, the performance reliability of the five-prevention interlocking device can be influenced under severe environments such as humid, high-temperature, dust or corrosive gas environments, and the probability of faults is increased due to easy rusting of mechanical parts. Disclosure of Invention The invention aims to provide a five-prevention mechanical interlocking mechanism of an upper isolation three-station ring main unit, which has the advantages of stable structure, strong functionality, good adaptability, safety and reliability. In order to solve the problems in the prior art, the five-prevention mechanical interlocking mechanism of the upper isolation three-station ring main unit provided by the invention comprises a fixed plate, a breaker closing operation shaft, a breaker opening and closing indication shaft, a grounding switch operation shaft and an isolation switch operation shaft which are arranged on the fixed plate through bearings, wherein a first interlocking rod, a second interlocking rod, a third interlocking rod, a fourth interlocking rod, a fifth interlocking rod and a sixth interlocking rod which are in sliding fit with the fixed plate are also arranged on the fixed plate, an opening and closing limiting block is fixed on the breaker opening and closing operation shaft, a breaking crank arm and a breaking indication plate are fixed on the breaker opening and closing indication plate correspondingly, a first grounding crank arm and a second grounding crank arm are fixed on the groun