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CN-122025470-A - Self-adaptive arc extinction pole-mounted circuit breaker

CN122025470ACN 122025470 ACN122025470 ACN 122025470ACN-122025470-A

Abstract

The invention discloses a self-adaptive arc quenching pole-mounted circuit breaker which comprises a bottom plate, a mechanism box arranged on the bottom plate, side support plates arranged on one side part of the mechanism box and isolating switch components arranged on the side support plates, wherein three groups of phase pole components are uniformly arranged at the top of the mechanism box along a preset interval, current transformers are respectively assembled on the three groups of phase pole components, a control switch component is arranged on the other side part of the mechanism box, a single-phase control mechanism is arranged between the bottom plate and the side support plates and corresponds to the three groups of phase pole components, the single-phase control mechanism comprises an angle pushing component and an elastic compression reset component, two groups of side support plates are symmetrically arranged, a three-phase control mechanism is arranged between the two groups of side support plates, and the three-phase control mechanism comprises a driving component and an integrated transmission interface component. The invention belongs to the technical field of power distribution network protection equipment, and particularly relates to a self-adaptive arc extinction pole-mounted circuit breaker.

Inventors

  • MAO QIANG
  • LI GUANGZE
  • WANG CONG
  • Ren Wujie

Assignees

  • 浙江邦耀电气有限公司

Dates

Publication Date
20260512
Application Date
20260203

Claims (10)

  1. 1. The self-adaptive arc-extinguishing pole-mounted circuit breaker comprises a bottom plate (1), a mechanism box (11) arranged on the bottom plate (1), a side support plate (12) arranged on one side part of the mechanism box (11) and a disconnecting switch assembly (13) arranged on the side support plate (12), wherein three groups of phase pole assemblies (14) are uniformly arranged at the top of the mechanism box (11) along a preset interval, current transformers (15) are respectively assembled on the three groups of phase pole assemblies (14), and a control switch assembly (16) is arranged on the other side part of the mechanism box (11), and the self-adaptive arc-extinguishing pole-mounted circuit breaker is characterized in that a single-phase control mechanism (2) is arranged between the bottom plate (1) and the side support plate (12) corresponding to the three groups of phase pole assemblies (14), and the single-phase control mechanism (2) comprises a push angle assembly (21) and an elastic compression reset assembly (22); two groups of side support plates (12) are symmetrically arranged, a three-phase control mechanism (3) is arranged between the two groups of side support plates (12), and the three-phase control mechanism (3) comprises a driving assembly (31) and an integrated transmission interface assembly (32).
  2. 2. The self-adaptive arc quenching pole-mounted circuit breaker according to claim 1, wherein the driving assembly (31) comprises an inverted L plate (311) fixed on the bottom plate (1), a driving cylinder (312) fixed on the vertical end of the inverted L plate (311), a driving frame (313) arranged on the horizontal end of the inverted L plate (312) in a sliding manner, a driving motor (314) fixed on the bottom of the driving frame (313), a first straight-tooth conical gear (315) rotatably arranged in the driving frame (313), a second straight-tooth conical gear (317) rotatably arranged in the driving frame (313) and meshed with the first straight-tooth conical gear (315), and a connecting rod (316) fixed on the central shaft of the second straight-tooth conical gear (317); The piston rod of the driving and moving cylinder (312) penetrates through the inverted L plate (311) in a sliding manner and is fixedly connected with the driving and moving frame (313); An output shaft of the driving motor (314) rotates to penetrate through the driving frame (313) and is fixedly connected with a central shaft of the straight-tooth conical gear I (315); the connecting rod (316) rotates to penetrate through the two groups of side support plates (12).
  3. 3. The self-adaptive arc extinguishing pole-mounted circuit breaker according to claim 2, wherein two groups of blocking rings (3161) are fixedly arranged on the connecting rod (316), and the diameter of the blocking rings (3161) is larger than the diameter of a through hole of the connecting rod (316) penetrating through the side support plate (12); One group of blocking rings (3161) is positioned on the outer side of the side support plate (12) close to the driving assembly (31), and the other group of blocking rings (3161) is positioned on the inner side of the other group of side support plates (12).
  4. 4. The adaptive arc quenching pole-on-pole circuit breaker as recited in claim 2 wherein the integrated transmission interface assembly (32) includes three sets of connectors (321) axially spaced apart and fixed by a connecting rod (316), and three sets of control members (322) slidably and rotatably mounted on the connecting rod (316) and corresponding to the connectors (321); The plug connector (321) comprises a cover plate (3211) fixed on the connecting rod (316), and a plug block (3212) fixed on the cover plate (3211); The control piece (322) comprises a rotary table (3221) with a central hole (3222), a bearing (3223) arranged in the central hole (3222), a slot (3224) arranged on the rotary table (3221), and a linkage rod (3225) symmetrically fixed on the periphery of the rotary table (3221) and provided with a mounting hole (3226), wherein the linkage rod (3225) is connected with the isolating switch assembly (13) through the mounting hole (3226); the bearing (3223) is sleeved on the connecting rod (316) and can slide along the connecting rod; the insert block (3212) is inserted into the slot (3224); the installation hole (3226) is movably inserted with a bolt (3227), and the linkage rod (3225) is in transmission connection with the isolating switch assembly (13) through the bolt (3227).
  5. 5. The pole-on-pole circuit breaker with adaptive arc quenching as claimed in claim 4, wherein the slot (3224) and the insert block (3212) are of mutually matched non-circular cross-sectional design.
  6. 6. The self-adaptive arc-extinguishing pole-mounted circuit breaker according to claim 2, wherein T-shaped sliding blocks (3131) are symmetrically fixed at two ends of the driving frame (313), T-shaped grooves (3111) are formed at the horizontal ends of the inverted L-shaped plates (311) corresponding to the T-shaped sliding blocks (3131), and the T-shaped sliding blocks (3131) are slidably fit into the T-shaped grooves (3111).
  7. 7. The self-adaptive arc-extinguishing pole-mounted circuit breaker according to claim 1, wherein the push-angle assembly (21) comprises a telescopic cylinder (211) with the bottom fixed on the bottom plate (1) and at a certain inclination angle, a hinge seat (212) fixed on a piston rod of the telescopic cylinder (211), a hinge joint (213) hinged on the hinge seat (212), limit plates (214) symmetrically fixed on two ends of the hinge seat (212), a top block (215) fixed on the hinge joint (213) and an elastic clamping block (216) fixed on the top block (215); the top block (215) is used for abutting against the bottom of the linkage rod (3225) during the action; the elastic clamping block (216) is used for clamping a gap (3228) between two groups of linkage rods (3225) after being adjusted by utilizing self elastic deformation; the limiting plate (214) is used for limiting the rotation angle range of the hinge joint (213).
  8. 8. The adaptive arc quenching pole-mounted circuit breaker as recited in claim 4 wherein the resilient compression return assembly (22) includes inclined plates (221) mounted on the two sets of side plates (12) and return springs (222) fixedly mounted on the inclined plates (221); the reset springs (222) are arranged in two groups corresponding to each turntable (3221) and are symmetrically arranged, and the other ends of the two groups of reset springs (222) respectively act on two ends of a bolt (3227) inserted into a mounting hole (3226) of the linkage rod (3225).
  9. 9. An adaptive arc quenching on-column circuit breaker according to claim 1, characterized in that a zero sequence current sensing unit (17) is integrated at the spatial convergence of three groups of said phase-column assemblies (14); the sensing unit is a flexible rogowski coil which is prefabricated into an annular structure matched with the outer diameters of three groups of phase column assemblies (14), is directly and tightly sleeved at the root parts of the three groups of phase column assemblies (14), and surrounds the public periphery of the phase column assemblies (14); The Rogowski coil is integrally encapsulated and fixed with the phase column assembly (14) through a vacuum-cast liquid silicone rubber insulating material (171); the rogowski coil is electrically connected with an external intelligent diagnosis unit.
  10. 10. The self-adaptive arc quenching pole-mounted circuit breaker according to claim 4, wherein the isolating switch assembly (13) comprises a base (131) arranged on the side support plate (12), a pole insulator (132) arranged on the bottom plate (1) corresponding to the three groups of phase pole assemblies (14), two groups of symmetrical conductive blades (133) hinged to the ends of the current transformers (15) on the three groups of phase pole assemblies (14), and an operation insulator (134); a contact (1331) is fixed at the end of the conductive blade; the top of the post insulator is provided with a static contact seat (1321) for clamping a contact head (1331); the top of the operation insulator (134) is hinged between the two groups of conductive blades (133), the bottom of the operation insulator (134) is fixedly connected with a bolt (3227), and the bolt (3227) is rotatably installed on the linkage rod (3225) through an installation hole (3226).

Description

Self-adaptive arc extinction pole-mounted circuit breaker Technical Field The invention belongs to the technical field of power distribution network protection equipment, and particularly relates to a self-adaptive arc extinction pole-mounted circuit breaker. Background The pole-mounted circuit breaker is used as core equipment for fault isolation and line control of the power distribution network, and the running reliability, the operation flexibility and the fault processing capacity of the pole-mounted circuit breaker directly determine the power supply stability and the power supply quality of the power distribution network. Along with intelligent upgrading of the power distribution network, higher requirements are put forward on the working condition suitability, fault response precision and operation and maintenance convenience of the pole-mounted circuit breaker, but a plurality of pain points to be solved urgently still exist in the prior art, and actual operation requirements are difficult to meet. The existing pole-mounted circuit breaker mostly adopts a three-phase integrated driving framework, only has a three-phase synchronous switching-on and switching-off function, and lacks single-phase independent control capability. When a single-phase earth fault occurs in the power distribution network, the circuit breaker can only execute 'one-knife' three-phase synchronous tripping, so that non-fault phases are also powered off, the power failure range is greatly enlarged, the power utilization continuity of a user is seriously influenced, and the circuit breaker is contrary to the core requirement of 'accurate fault isolation and minimum power failure' of the power distribution network, and the power supply reliability is difficult to promote. In terms of single-phase grounding fault detection, the zero-sequence current sensing units of the existing equipment are installed in a split type or are arranged in a non-current collecting area, so that the problems of installation gaps, detection dead zones, weak anti-interference capability and the like exist, weak zero-sequence current signals are difficult to accurately capture, particularly high-resistance grounding current and normal capacitance-to-ground current cannot be effectively distinguished, fault misjudgment and leakage judgment rate are high, reliable data support cannot be provided for accurate switching, and fault processing accuracy is restricted. The circuit breaker partially tries to realize the single-phase breaking function adopts a multi-phase independent driving scheme, so that the special motor, electromagnet and control module are arranged for each phase, the equipment structure is complex, the manufacturing cost is greatly increased, the system fault rate is increased due to large cooperative difficulty of a plurality of groups of electric control elements, the power path is switched through an electronic switch and a clutch, the complex electric control loop is relied on in the scheme, the response speed is low, and the problems of misoperation, multi-phase linkage failure and the like are easy to occur under severe working conditions such as outdoor humidity, dust and electromagnetic interference, and the reliability is difficult to guarantee. Meanwhile, three-phase linkage and single-phase control of the existing circuit breaker are mutually independent, and an integrated collaborative design is lacking, so that strict synchronism of opening and closing actions is difficult to ensure in a three-phase linkage mode, stability of conventional operation and maintenance (such as planned power failure and line switching) of a power grid is affected, the problems that transmission precision is low, reset is unreliable, angle locking is easily affected by vibration and the like exist in a single-phase control mode, and power transmission paths are complex to switch, so that conventional operation efficiency and fault emergency treatment flexibility cannot be considered. Disclosure of Invention The invention provides a self-adaptive arc-quenching pole-mounted circuit breaker, which aims to solve the problems that the existing pole-mounted circuit breaker has large power failure range, low fault detection accuracy, a single-phase switching-off scheme has high cost and poor reliability, and three-phase and single-phase control cannot be cooperatively matched. In order to realize the functions, the invention adopts the following technical scheme that the self-adaptive arc-extinguishing pole-mounted circuit breaker comprises a bottom plate, a mechanism box arranged on the bottom plate, a side support plate arranged on one side part of the mechanism box and a disconnecting switch assembly arranged on the side support plate; Three groups of phase column assemblies are uniformly arranged at the top of the mechanism box along a preset interval, and current transformers are assembled on the three groups of phase column assemblies; the other side