Gap-adjustable circuit breaker for studying dielectric insulation recovery characteristic under multiple thunder

Abstract

The utility model relates to the field of circuit breakers, in particular to a gap-adjustable circuit breaker used for researching dielectric insulation recovery characteristics under multiple thunder. The real-type circuit breaker comprises a real-type circuit breaker body, branch buses connected to two sides of the real-type circuit breaker body, and creepage increasing sleeve units connected to the two groups of branch buses. The real-type circuit breaker body comprises a shell; a real-type arc extinguish chamber is arranged in the shell; a moving contact and a static contact are arranged in the real-type arc extinguish chamber; a transmission assembly used for adjusting the gap between the moving contact and the static contact is arranged outside the shell, and the shell is further provided with an observation window used for observing the gap between the moving contact and the static contact and a test pull port with a built-in partial discharge sensor. According to the utility model, multiple lightning strokes are tested, so that theoretical analysis and simulation calculation are verified, the reclosing success rate of circuit breaker equipment under multiple lightning strokes is improved, and the operation reliability of power equipment is improved. The whole operation mode is simple and reliable, measurement is convenient, and the adjusting precision can reach 0.5 mm.

Description

Technical Field

[0001] The utility model relates to the field of circuit breakers, in particular to an adjustable gap circuit breaker for studying dielectric insulation recovery characteristics under multiple lightning strikes. Background Art

[0002] With the rapid development of power technology, electricity has become an extremely important resource for social production activities. However, failures caused by multiple lightning strikes occur from time to time, seriously affecting the safe and stable operation of the power grid. Therefore, the damage mechanism of multiple lightning strikes to the power grid and the corresponding protection measures need to be studied urgently. In order to ensure the safe operation of the power grid, it is particularly important to study the dielectric insulation recovery characteristics of circuit breakers under multiple lightning strikes and optimize the design to improve the reclosing success rate of circuit breaker equipment.

[0003] The fault clearing rate of circuit breakers is one of the important indicators for lightning risk assessment of distribution lines. The fault clearing rate of circuit breakers under multiple lightning strikes directly affects the operational reliability of the transmission and distribution system. However, the type test of circuit breaker products only verifies the short-circuit current, nearby faults, out-of-step closing and breaking, capacitive current and inductive load. There is a lack of effective verification methods for the breaking and closing performance under multiple lightning strikes. Utility Model Content

[0004] In view of the problems existing in the background technology, an adjustable gap circuit breaker for studying dielectric insulation recovery characteristics under multiple lightning strikes is proposed.

[0005] The utility model proposes an adjustable gap circuit breaker for studying dielectric insulation recovery characteristics under multiple lightning strikes, comprising a true type circuit breaker body, branch busbars connected to both sides of the true type circuit breaker body, and creepage bushing units connected to two groups of branch busbars. The true type circuit breaker body comprises a shell; a true type arc extinguishing chamber is arranged in the shell; a moving contact and a stationary contact are arranged in the true type arc extinguishing chamber; a transmission assembly for adjusting the gap between the moving contact and the stationary contact is arranged outside the shell, and an observation window for observing the gap between the moving contact and the stationary contact and a test pull-out port of a built-in partial discharge sensor are also arranged.

[0006] Preferably, a guide sleeve with a true arc extinguishing chamber embedded in it is provided on the shell; the moving contact is slidably arranged on the sleeve opening of the guide sleeve; a transmission rod 1 is slidably arranged in the guide sleeve; one end of the transmission rod 1 is connected to the moving contact, and the other end is connected to the transmission end of the transmission assembly.

[0007] Preferably, the transmission assembly includes a shell; a mounting seat with a bearing and a transmission rod 2 slidably connected to the mounting seat through the bearing are arranged at one end of the shell, a connecting head and a screw threadedly connected to the connecting head are arranged at the other end of the shell, and a connecting piece 1 and a connecting piece 2 that are connected to each other are arranged inside the shell; a thrust ball bearing is arranged in the connecting piece 1; the screw passes through the shell, and the end portion extends into the connecting piece 1 and is connected to the thrust ball bearing; one end of the transmission rod 2 extends into the shell and is connected to the connecting piece 2, and the other end extends into the guide sleeve and is connected to the transmission rod 1.

[0008] Preferably, the observation window is made of JGS1 far ultraviolet optical quartz glass.

[0009] Preferably, the climbing casing unit is made of silicone rubber, one end of which serves as the introduction end of the lightning wave, and the other end of which serves as the grounding end during the test process.

[0010] Compared with the prior art, the utility model has the following beneficial technical effects: by operating the transmission assembly, the rotation + linear motion of the lead screw is converted into the linear motion of the moving contact, thereby realizing the gap adjustment of the moving contact and the static contact in the real arc extinguishing chamber. The staff studies the arc development and extinction by observing the size of the moving contact and the static contact. Then, multiple lightning strikes are tested to verify the theoretical analysis and simulation calculations, so as to improve the reclosing success rate of the circuit breaker equipment under multiple lightning strikes and improve the operating reliability of the power equipment. The overall operation method is simple, reliable and easy to measure, and the adjustment accuracy can reach 0.5mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of an adjustable gap circuit breaker used for studying dielectric insulation recovery characteristics under multiple lightning strikes in the utility model;

[0012] Figure 2 This is a schematic diagram of the internal structure of the true arc extinguishing chamber in the utility model;

[0013] Figure 3 This is a schematic diagram of the connection relationship between the transmission assembly and the housing in the utility model;

[0014] Figure 4 It is a structural schematic diagram of the transmission component in the utility model.

[0015] Figure numerals: 1. True type circuit breaker body; 11. Transmission assembly; 111. Screw; 112. Connector; 113. Housing; 114. Thrust ball bearing; 115. Connector 2; 116. Transmission rod 2; 117. Mounting seat; 118. Bearing; 119. Connector 1; 12. True type arc extinguishing chamber; 121. Static contact; 122. Moving contact; 123. Guide sleeve; 124. Transmission rod 1; 13. Observation window; 14. Test pull-out port; 2. Branch busbar; 3. Climbing bushing unit. DETAILED DESCRIPTION

[0016] Embodiment 1

[0017] like Figure 1-Figure 2 As shown, the adjustable gap circuit breaker proposed by the utility model for studying the dielectric insulation recovery characteristics under multiple lightning strikes includes a real circuit breaker body 1, branch busbars 2 connected to both sides of the real circuit breaker body 1, and a creepage bushing unit 3 connected to two groups of branch busbars 2; the creepage bushing unit 3 can be used for the introduction of lightning waves. The real circuit breaker body 1 includes a shell; a real arc extinguishing chamber 12 is arranged in the shell; a moving contact 122 and a static contact 121 are arranged in the real arc extinguishing chamber 12 to simulate the internal structure of a 110kV circuit breaker; a transmission assembly 11 for adjusting the gap between the moving contact 122 and the static contact 121 is arranged outside the shell, and an observation window 13 for observing the gap between the moving contact 122 and the static contact 121 and a test pull-out port 14 of a built-in partial discharge sensor are also arranged. The staff manually operates the transmission assembly 11 to adjust the gap between the moving contact 122 and the static contact 121 to realize the opening and closing of the circuit breaker. The observation window 13 on one side is used for supplementary lighting, and the other side can be used as an observation window for arc development and extinction, through which the staff can observe the fracture and measure the gap size.

[0018] Embodiment 2

[0019] like Figure 1-Figure 2 As shown, the adjustable gap circuit breaker proposed by the utility model for studying the dielectric insulation recovery characteristics under multiple lightning strikes includes a real circuit breaker body 1, branch busbars 2 connected to both sides of the real circuit breaker body 1, and a creepage bushing unit 3 connected to two groups of branch busbars 2; the creepage bushing unit 3 can be used for the introduction of lightning waves. The real circuit breaker body 1 includes a shell; a real arc extinguishing chamber 12 is arranged in the shell; a moving contact 122 and a static contact 121 are arranged in the real arc extinguishing chamber 12 to simulate the internal structure of a 110kV circuit breaker; a transmission assembly 11 for adjusting the gap between the moving contact 122 and the static contact 121 is arranged outside the shell, and an observation window 13 for observing the gap between the moving contact 122 and the static contact 121 and a test pull-out port 14 of a built-in partial discharge sensor are also arranged.

[0020] It should be further explained that the observation window 13 is made of JGS1 far-ultraviolet optical quartz glass, and the Schlieren method is used to monitor the entire discharge process in real time.

[0021] It should be further explained that the climbing casing unit 3 is made of silicone rubber, one end of which serves as the introduction end of the lightning wave and the other end as the grounding end of the test process. It can withstand a lightning impulse voltage of 1200kV, is light in weight and convenient for lifting, has excellent explosion-proof performance and good hydrophobic performance.

[0022] like Figure 3As shown, the housing is provided with a guide sleeve 123 embedded in the true arc extinguishing chamber 12; the moving contact 122 is slidably arranged on the sleeve opening of the guide sleeve 123; a transmission rod 124 is slidably arranged in the guide sleeve 123; one end of the transmission rod 124 is connected to the moving contact 122, and the other end is connected to the transmission end of the transmission assembly 11. The horizontal movement of the moving contact 122 is realized through the transmission of the transmission assembly 11, and the opening and closing of the circuit breaker is realized manually.

[0023] like Figure 4 As shown, the transmission assembly 11 includes a housing 113; a mounting seat 117 with a bearing 118 and a transmission rod 116 slidably connected to the mounting seat 117 through the bearing 118 are arranged at one end of the housing 113; a connector 112 and a lead screw 111 threadedly connected to the connector 112 are arranged at the other end of the housing 113; a connector 119 and a connector 115 connected to each other are arranged inside the housing 113; a thrust ball bearing 114 is arranged inside the connector 119; the lead screw 111 penetrates the housing 113, and the end thereof extends into the connector 119 and is connected to the thrust ball bearing 114; one end of the transmission rod 116 extends into the housing 113 and is connected to the connector 115, and the other end extends into the guide sleeve 123 and is connected to the transmission rod 124. When operating the transmission assembly 11, the rotation + linear motion of the lead screw 111 is converted into linear motion. Thus, the gap adjustment of the break of the moving contact 122 and the static contact 121 in the true arc extinguishing chamber 12 is realized. The transmission ratio is 1:1, the operation is simple, reliable and convenient for measurement.

[0024] The working principle of the utility model is as follows: the staff rotates the lead screw 111 to make it move horizontally at one end of the housing 113. During the movement, the connector 119 and the connector 2 115 cooperate to convert the rotation + linear motion of the lead screw 111 into the linear motion of the moving contact 122, thereby realizing the gap adjustment of the break of the moving contact 122 and the static contact 121 in the true arc extinguishing chamber 12. The staff can observe the size of the break of the moving contact 122 and the static contact 121 through the observation window 13 to study the development and extinction of the arc. Experiments are carried out on multiple lightning strikes to verify the theoretical analysis and simulation calculations, so as to improve the reclosing success rate of the circuit breaker equipment under multiple lightning strikes and improve the operating reliability of the power equipment. The overall operation method is simple, reliable and easy to measure, and the adjustment accuracy can reach 0.5mm.

[0025] The implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An adjustable gap circuit breaker for studying dielectric insulation recovery characteristics under multiple lightning strikes, characterized in that: It comprises a true type circuit breaker body (1), branch busbars (2) connected to both sides of the true type circuit breaker body (1), and a climbing bushing unit (3) connected to the two sets of branch busbars (2); A true type circuit breaker body (1) comprises a shell; a true type arc extinguishing chamber (12) is arranged in the shell; a moving contact (122) and a stationary contact (121) are arranged in the true type arc extinguishing chamber (12); a transmission assembly (11) for adjusting the gap between the moving contact (122) and the stationary contact (121) is arranged outside the shell, and an observation window (13) for observing the gap between the moving contact (122) and the stationary contact (121) and a test extraction port (14) with a built-in partial discharge sensor are also arranged.

2. The adjustable gap circuit breaker for studying dielectric insulation recovery characteristics under multiple lightning strikes according to claim 1 is characterized in that: A guide sleeve (123) embedded in a true arc extinguishing chamber (12) is provided on the housing; a moving contact (122) is slidably provided on a sleeve opening of the guide sleeve (123); a transmission rod (124) is slidably provided in the guide sleeve (123); one end of the transmission rod (124) is connected to the moving contact (122), and the other end is connected to a transmission end of a transmission assembly (11).

3. The adjustable gap circuit breaker for studying dielectric insulation recovery characteristics under multiple lightning strikes according to claim 2 is characterized in that: The transmission assembly (111) comprises a housing (113); a mounting seat (117) with a bearing (118) and a second transmission rod (116) slidably connected to the mounting seat (117) via the bearing (118) are arranged at one end of the housing (113); a connecting head (112) and a lead screw (111) threadedly connected to the connecting head (112) are arranged at the other end of the housing (113); a first connecting member (119) and a second connecting member (115) connected to each other are arranged inside the housing (113); a thrust ball bearing (114) is arranged inside the first connecting member (119); the lead screw (111) passes through the housing (113), and the end thereof extends into the first connecting member (119) and is connected to the thrust ball bearing (114); one end of the second transmission rod (116) extends into the housing (113) and is connected to the second connecting member (115), and the other end extends into the guide sleeve (123) and is connected to the first transmission rod (124).

4. The adjustable gap circuit breaker for studying dielectric insulation recovery characteristics under multiple lightning strikes according to claim 1, characterized in that: The observation window (13) is made of JGS1 far ultraviolet optical quartz glass.

5. The adjustable gap circuit breaker for studying dielectric insulation recovery characteristics under multiple lightning strikes according to claim 1, characterized in that: The creepage enhancement casing unit (3) is made of silicone rubber, one end of which serves as an introduction end for lightning waves, and the other end of which serves as a grounding end during the test process.

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