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CN-115483071-B - Zero-loss depth current-limiting protection device

CN115483071BCN 115483071 BCN115483071 BCN 115483071BCN-115483071-B

Abstract

The invention discloses a zero-loss depth current-limiting protection device, which relates to the technical field of protection devices, and comprises a base, wherein a control cabinet is arranged at one side of the top end of the base, a plurality of protection devices are arranged at one side of the control cabinet, and a refrigerating mechanism is arranged in the control cabinet; the refrigerating mechanism comprises an air supply pipe, a refrigerating device, an arc-shaped pipe, a guide plate and a separation plate, wherein the refrigerating device is arranged at the bottom end of the inside of the control cabinet, the air supply pipe is arranged at the bottom end of the refrigerating device, the protection device comprises a fixing seat, a quick circuit breaker, a barrel type converter and a current-limiting reactor, the bottom end of the fixing seat is contacted with the top end of the base, and the quick circuit breaker is fixedly connected to the top end of the fixing seat. The invention relates to a zero-loss depth current-limiting protection device, which ensures the cooling effect and reduces the influence of liquid water on internal elements, and the acting force direction of an eddy current disc is coaxial with the moving direction of a moving contact, so that the switching-on and switching-off operations can be completed in a short time.

Inventors

  • WANG ZHEN
  • ZHANG SHENGXIU
  • ZHU LING

Assignees

  • 安徽辉达电力科技有限公司

Dates

Publication Date
20260508
Application Date
20220930

Claims (9)

  1. 1. The zero-loss depth current-limiting protection device is characterized by comprising a base (1), wherein a control cabinet (2) is arranged on one side of the top end of the base (1), a plurality of protection devices are arranged on one side of the control cabinet (2), and a refrigerating mechanism is arranged in the control cabinet (2); The refrigerating mechanism comprises an air supply pipe (7), a refrigerating device (8), an arc-shaped pipe (9), a guide pipe (10), a guide plate (15) and a separation plate (16), wherein the refrigerating device (8) is arranged at the bottom end of the inside of the control cabinet (2), the air supply pipe (7) is arranged at the bottom end of the refrigerating device (8), the bottom end of the air supply pipe (7) extends to the inside of the base (1), one side of the air supply pipe (7) is communicated with the arc-shaped pipe (9), the micro motor (11) is obliquely arranged at the other side of the bottom end of the inside of the control cabinet (2), a rotary blade (12) is arranged at the output end of the micro motor (11), a limiting plate (13) is arranged at the top end of the refrigerating device (8), a plurality of openings (132) are formed in the inside of the limiting plate (13), inverted-V-shaped water absorbing nets (133) are arranged in the inside of the opening (132), a heat absorption layer (131) is arranged in the inside of the limiting plate (13), the separation plate (16) is arranged at the top end of the limiting plate (16), a guide plate (162) is provided with a fixed flow channel (161), the top end width of the guide plate (15) is larger than the bottom end width, a guide pipe (10) is arranged at the bottom end of the circulation groove (162), and the bottom end of the guide pipe (10) extends to the inside of the base (1); The protection device comprises a fixed seat (3), a quick breaker (4), a barrel type current converter (5) and a current limiting reactor (6), wherein the bottom end of the fixed seat (3) is in contact with the top end of a base (1), the quick breaker (4) is fixedly connected with the top end of the fixed seat (3), a sealing plate (404) is arranged in the middle of the quick breaker (4), an upper pull rod (405) is arranged in the middle of the sealing plate (404), a moving contact (402) is arranged at the top end of the upper pull rod (405), a corrugated pipe (403) is symmetrically arranged at the two sides of the bottom end of the moving contact (402), a static contact (401) is arranged at the top end of the moving contact (402), a pull rod insulator (406) is arranged at the bottom end of the upper pull rod (405), a lower pull rod (407) is fixedly connected with a lower pull rod (409) which is provided with an armature (409), two closing permanent magnets (408) are symmetrically arranged at the top end of the armature (409), two eddy current coils (410) are symmetrically arranged at the bottom ends of the armature (409) and the two eddy current coils (410) are arranged at the bottom ends of the separating coil (411), the bottom of vortex dish (412) is provided with closing coil (413), the top of quick circuit breaker (4) is provided with barrel type converter (5), the top of barrel type converter (5) is provided with current limiting reactor (6).
  2. 2. The zero-loss depth current limiting protection device according to claim 1, wherein an annular pipe (101) is arranged in the base (1), one side of the annular pipe (101) is fixedly connected with a connecting pipe (102), one end of the connecting pipe (102) is connected with the bottom end of an air supply pipe (7), a plurality of groups of air supply pipes (305) are symmetrically arranged at the top end of the annular pipe (101), the top end of each group of air supply pipes (305) extends to the inside of a corresponding fixing seat (3), C-shaped pipes (302) are arranged at the top ends of the air supply pipes (305), two C-shaped pipes (302) are oppositely arranged, a protection cover plate (303) is arranged at the top ends of the two C-shaped pipes (302), a baffle plate (301) is arranged at the top end of the protection cover plate (303), and a plurality of inclined plates (306) are obliquely arranged in the baffle plate (301).
  3. 3. The zero-loss depth current-limiting protection device according to claim 2, wherein the bottom end of the inside of the fixing seat (3) is in a convex shape, two water outlet pipes (304) are symmetrically arranged at the bottom end of the inside of the fixing seat (3), the cross section of each water outlet pipe (304) is U-shaped, and one end of each water outlet pipe (304) extends to the outside of the fixing seat (3).
  4. 4. A zero-loss depth current limiting protection device according to claim 3, wherein a plurality of bearing plates (14) are vertically arranged on one side of the partition plate (16), a cable matching device (201) is arranged on one side of the top end of the limiting plate (13), voltage sensors (202) are arranged on the top ends of the two bearing plates (14), a wall bushing (203) is arranged in the middle of the partition plate (16), and a current sensor (204) is arranged at the bottom end of the wall bushing (203).
  5. 5. The zero-loss deep current limiting protection device of claim 4, wherein a plurality of bearing plates (14) are arranged in parallel, a plurality of heat dissipation holes are formed in the bearing plates (14) at equal intervals along the inner edge, and one side of each heat dissipation hole is provided with a mounting hole.
  6. 6. The zero-loss depth current limiting protection device according to claim 5, wherein an opening (132) is arranged right above the top end of the arc-shaped pipe (9), and the central axis of the rotating blade (12) is prolonged and then is intersected with the opening (132).
  7. 7. The zero-loss deep current limiting protection device of claim 6, wherein the two ends of the water outlet pipe (304) are different in height, one end of the water outlet pipe (304) extending into the fixing seat (3) is higher than the other end, and the two water outlet pipes (304) are symmetrically arranged along the central axis of the fixing seat (3).
  8. 8. The zero-loss deep current-limiting protection device according to claim 7, wherein the bottom end of the annular pipe (101) is provided with a micro-pipeline, and the bottom end of the micro-pipeline coincides with the bottom end of the flow guiding pipe (10).
  9. 9. The zero-loss deep current-limiting protection device according to claim 8, wherein the shell of the quick breaker (4) is made of ceramic.

Description

Zero-loss depth current-limiting protection device Technical Field The invention relates to the technical field of protection devices, in particular to a zero-loss deep current-limiting protection device. Background As is well known, when a short circuit fault occurs in a power system, the short circuit current is generally ten times of rated current, which causes great harm to electrical equipment such as a transformer, a generator, a circuit breaker, a power transmission line and the like, and the current economical and practical vacuum circuit breaker has the breaking capacity below 40KA and needs tens of milliseconds. With the large lifting of the electric load, the capacity of the main transformer is correspondingly increased, the short-circuit current faced by the power grid system is close to and reaches the larger use limit of the load vacuum circuit breaker, so that the safety of each device can be influenced, and the zero-loss deep current-limiting protection device can solve the current dilemma. The zero-loss deep current-limiting protection device in the current market usually completes operations such as opening and closing in a short time through a quick breaker, and solves the problems of current limiting and loss through increasing impedance through a transformer in a control cabinet, but because the impedance is increased by light, the electric power is slightly reduced, the current limiting depth is insufficient, and the problems of active and reactive loss, rising investment cost and the like are brought, so that main electric equipment such as a generator, a transformer and the like cannot be effectively protected. However, when the existing zero-loss depth current-limiting protection device works normally, a large amount of heat can be generated by each element in the protection device, the normal work of the elements can be influenced by heat accumulation in the protection device, and therefore a refrigerating mechanism is required to be designed to cool the protection device, cold air and hot air are contacted in the cooling process, gaseous water in the protection device can be condensed into liquid water and drop on the elements, a certain potential safety hazard exists, the protection device normally directly uses an internal quick breaker to complete the switching-on and switching-off function, the switching-on and switching-off speed is low, the current-limiting problem cannot be rapidly and accurately solved, and the protection effect is poor. Disclosure of Invention The invention mainly aims to provide a zero-loss depth current limiting protection device, which can effectively solve the problems that in the prior art, when the existing zero-loss depth current limiting protection device works normally, a large amount of heat is generated by each element in the protection device, and the normal work of the element is affected by heat accumulation in the protection device, so that a refrigeration mechanism is required to be designed for cooling the protection device, but in the cooling process, cold air is contacted with hot air, gaseous water in the protection device is condensed into liquid water and drops on the element, a certain potential safety hazard exists, and the protection device usually directly uses an internal quick breaker to complete a switching-on/off function, but the switching-on/off speed is slow, and the problem of poor protection effect cannot be solved quickly and accurately, thereby causing the problem of poor protection effect. In order to achieve the purpose, the zero-loss depth current-limiting protection device comprises a base, wherein a control cabinet is arranged on one side of the top end of the base, a plurality of protection devices are arranged on one side of the control cabinet, and a refrigerating mechanism is arranged in the control cabinet; The refrigerating mechanism comprises an air supply pipe, a refrigerating device, an arc-shaped pipe, a guide plate and a separation plate, wherein the refrigerating device is arranged at the inner bottom end of the control cabinet, the air supply pipe is arranged at the bottom end of the refrigerating device, the bottom end of the air supply pipe extends to the inner part of the base, the arc-shaped pipe is communicated with one side of the air supply pipe, a micro motor is obliquely arranged at the other side of the inner bottom end of the control cabinet, a rotating blade is arranged at the output end of the micro motor, a limiting plate is arranged at the top end of the refrigerating device, a plurality of openings are formed in the limiting plate, an inverted V-shaped water absorption net is arranged in the openings, a heat absorption layer is arranged in the limiting plate, a separation plate is arranged at the top end of the limiting plate, a circulation groove is formed in the inner part of the separation plate, a fixing plate is arranged at the middle part of the circulation groove, the guide plat