A kind of solid-sealed pole circuit breaker specially used for wind power

Abstract

The present invention discloses a wind power-specific sealed pole circuit breaker. The wind power-specific sealed pole circuit breaker is mainly composed of a spring operating mechanism, a main shaft, a first insulating pull rod, a sealed pole, a first copper busbar, a current transformer, an isolating switch, a sensor, and a second insulating pull rod, which are interconnected and installed on a frame. Since the wind power-specific sealed pole circuit breaker of the present invention adopts a current transformer and a circuit breaker combined structure, it does not need to be replaced after use like a traditional fuse, so the cost is lower; and the wind power-specific sealed pole circuit breaker of the present invention adopts a current transformer for detection and protection, and adopts a circuit breaker for breaking, so the breaking current is larger, which can meet the current market demand for wind power equipment with higher breaking current.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power switches, and in particular to a wind power-specific sealed pole circuit breaker. Background Art

[0002] Existing wind power switches mostly use a load switch-fuse combination structure, which has the disadvantage that the fuse should be replaced immediately after it is broken, so the cost is high, and the breaking current of the load switch-fuse combination structure is small. However, with the rapid development of wind power technology, wind power switches often require a larger breaking current, so the circuit breaker (or wind power switch) with a load switch-fuse combination structure can no longer meet the requirements of wind power equipment on the market. Summary of the invention

[0003] The object of the present invention is to provide a wind power-specific sealed pole circuit breaker to solve the problems of low breaking current and high cost of the circuit breaker with a conventional load switch-fuse combination structure.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A wind power-specific sealed pole circuit breaker, comprising: a frame and a spring operating mechanism installed on the frame, a main shaft, a first insulating pull rod, a sealed pole, a first copper bus, a current transformer, a disconnector, a sensor, and a second insulating pull rod;

[0006] The spring operating mechanism is installed in front of the frame; one end of the main shaft is installed above the spring operating mechanism, and the other end of the main shaft is installed above the rear support plate of the frame; one end of the first insulating pull rod is connected to the crank arm welded on the main shaft, and the other end of the first insulating pull rod is connected to one end of the sealed pole; the first insulating pull rod is located on the right side of the frame; the sealed pole runs through the left and right sides of the frame; one end of the sealed pole is also connected to one end of the first copper bar; the other end of the first copper bar is connected to one end of the current transformer; the other end of the current transformer is installed on the frame; the current transformer and the first copper bar are both located on the right side of the frame, and the current transformer is located below the sealed pole;

[0007] The isolating switch includes an isolating switch main shaft and an isolating knife; the isolating switch main shaft is located on the right side of the frame and between the current transformer and the sealed pole; the other end of the sealed pole is in contact with one end of the isolating knife; the other end of the isolating knife is movably connected to one end of the sensor; the other end of the sensor is mounted on the frame; one end of the second insulating pull rod is connected to the middle of the isolating knife, and the other end of the second insulating pull rod is connected to the isolating switch main shaft; the isolating knife, the second insulating pull rod and the sensor are all located on the left side of the frame; the second insulating pull rod is located below the sealed pole; the sensor is located below the second insulating pull rod.

[0008] Optionally, the wind power-specific sealed pole circuit breaker further includes: an incoming line terminal; the incoming line terminal is connected to one end of the current transformer.

[0009] Optionally, the wind power-specific sealed pole circuit breaker also includes: an outlet terminal, a lightning arrester and a grounding switch; one end of the outlet terminal is connected to one end of the sensor; the other end of the outlet terminal is connected to one end of the lightning rod; the other end of the lightning rod is installed on the frame and connected to one end of the grounding switch; the other end of the grounding switch is grounded.

[0010] Optionally, the outlet terminal and the lightning arrester are both located on the left side of the frame; the lightning arrester is located below the sensor; and the grounding switch is located below the frame.

[0011] Optionally, the wind power-specific sealed pole circuit breaker further includes: a second copper bar; the second copper bar is installed at one end of the current transformer, and the second copper bar is connected to the incoming line end.

[0012] Optionally, the grounding switch is connected to the second copper busbar when in a closed state.

[0013] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0014] The present invention provides a wind power-specific sealed pole circuit breaker, which is mainly composed of a spring operating mechanism, a main shaft, a first insulating pull rod, a sealed pole, a first copper busbar, a current transformer, an isolating switch, a sensor, and a second insulating pull rod, which are connected and installed on a frame. Since the wind power-specific sealed pole circuit breaker of the present invention adopts a current transformer and a circuit breaker combined structure, it does not need to be replaced after use like a traditional fuse, so the cost is lower; and the wind power-specific sealed pole circuit breaker of the present invention adopts a current transformer for detection and protection, and a circuit breaker for breaking, so the breaking current is larger, which can meet the current market demand for wind power equipment with higher breaking current. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 A schematic diagram of the overall structure of a wind power-specific sealed pole circuit breaker provided by the present invention;

[0017] Figure 2 A front view of a wind power-specific sealed pole circuit breaker provided by the present invention;

[0018] Figure 3 A front cross-sectional view of a wind power-specific sealed pole circuit breaker provided by the present invention;

[0019] Figure 4 A top view of the wind power-specific sealed pole circuit breaker provided by the present invention;

[0020] Figure 5 A left side view of the wind power-specific sealed pole circuit breaker provided by the present invention;

[0021] Figure 6 A right side view of the wind power-specific sealed pole circuit breaker provided by the present invention;

[0022] The numbers in the figure are: incoming line terminal 1, current transformer 2, first copper bar 3, sealed pole 4, disconnector 5, second insulating rod 6, sensor 7, outgoing line terminal 8, lightning arrester 9, grounding switch 10, second copper bar 11, spring operating mechanism 12, main shaft 13, first insulating rod 14, rear support plate 15, frame 16, disconnector main shaft 17, and isolating knife 18. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The object of the present invention is to provide a wind power-specific sealed pole circuit breaker to solve the problems of low breaking current and high cost of the circuit breaker with a conventional load switch-fuse combination structure.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 The overall structure diagram of the wind power-specific sealed pole circuit breaker provided by the present invention is shown in FIG. Figure 1 As shown, the wind power-specific sealed pole circuit breaker is mainly composed of a main shaft 13, a first insulating rod 14, a sealed pole 4, a first copper busbar 3, a current transformer 2, a disconnector 5, a second insulating rod 6, a sensor 7, an incoming line terminal 1, an outgoing line terminal 8, a lightning arrester 9, a grounding switch 10, a second copper busbar 11 and a spring operating mechanism 12, which are interconnected and installed on a frame 16.

[0027] Figure 2 This is a front view of the wind power-specific sealed pole circuit breaker provided by the present invention. Figure 3 This is a front cross-sectional view of the wind power-specific sealed pole circuit breaker provided by the present invention. Figure 4 A top view of the wind power-specific sealed pole circuit breaker provided by the present invention. Figure 5 This is a left view of the wind power-specific sealed pole circuit breaker provided by the present invention. Figure 6 This is a right side view of the wind power-specific sealed pole circuit breaker provided by the present invention. Figure 1-6 In the wind power-specific sealed pole circuit breaker (circuit breaker for short) of the present invention, the spring operating mechanism 12 is installed on the front of the entire circuit breaker device, the main shaft 13 is above the frame 16 and connected to the spring operating mechanism 12, and then connected to the first insulating rod 14 located on the right side of the frame 16 through the crank arm welded on the main shaft 13, and the first insulating rod 14 is connected to the sealed pole 4 that passes through the left and right sides of the frame 16. The sealed pole 4 is connected to the current transformer 2 below through the first copper bar 3.

[0028] The main shaft 17 of the isolating switch 5 is located on the right side of the frame 16 and between the current transformer 2 and the sealed pole 4. The isolating knife 18 of the isolating switch 5 is located on the left side of the frame 16 and is connected to the main shaft 17 of the isolating switch 5 through the second insulating pull rod 6. The grounding switch 10 is below the current transformer 2 and is also the lower end of the entire circuit breaker device. On the left side of the circuit breaker device, the sensor 7 is located below the isolating knife 18 of the isolating switch 5. Further down is the lightning arrester 9, which is connected to the sensor 7 through the outlet terminal 8, thereby constituting the circuit breaker device described in the present invention.

[0029] Specifically, the wind power-specific sealed pole circuit breaker includes: a frame 16 and a spring operating mechanism 12 installed on the frame 16, a main shaft 13, a first insulating pull rod 14, a sealed pole 4, a first copper bus 3, a current transformer 2, a disconnector 5, a sensor 7, and a second insulating pull rod 6.

[0030] The spring operating mechanism 12 is installed in front of the frame 16; one end of the main shaft 13 is installed above the spring operating mechanism 12, and the other end of the main shaft 13 is installed above the rear support plate 15 of the frame 16. One end of the first insulating pull rod 14 is connected to the crank arm welded on the main shaft 13, and the other end of the first insulating pull rod 14 is connected to one end of the sealed pole 4. The first insulating pull rod 14 is located on the right side of the frame 16; the sealed pole 4 runs through the left and right sides of the frame 16. One end of the sealed pole 4 is also connected to one end of the first copper bar 3; the other end of the first copper bar 3 is connected to one end of the current transformer 2; the other end of the current transformer 2 is installed on the frame 16. The current transformer 2 and the first copper bar 3 are both located on the right side of the frame 16, and the current transformer 2 is located below the sealed pole 4.

[0031] The isolating switch 5 includes an isolating switch main shaft 17 and an isolating knife 18. Figure 3 As shown, the isolating switch main shaft 17 is located on the right side of the frame 16 and between the current transformer 2 and the sealed pole 4. The other end of the sealed pole 4 is in contact with one end of the isolating knife 18; the other end of the isolating knife 4 is movably connected with one end of the sensor 7; the other end of the sensor 7 is mounted on the frame 16. Therefore, the isolating knife 18 can rotate counterclockwise around one end of the sensor 7.

[0032] One end of the second insulating rod 6 is connected to the middle of the isolating switch 18, and the other end of the second insulating rod 6 is connected to the isolating switch main shaft 17. The isolating switch 18, the second insulating rod 6 and the sensor 7 are all located on the left side of the frame 16. The second insulating rod 6 is located below the sealed pole 4; the sensor 7 is located below the second insulating rod 6.

[0033] In practical applications, the wind power-specific sealed pole circuit breaker further includes: an incoming line terminal 1 ; the incoming line terminal 1 is connected to one end of the current transformer 2 .

[0034] In practical applications, the wind power-specific sealed pole circuit breaker further includes: an outlet terminal 8, a lightning arrester 9 and a grounding switch 10; one end of the outlet terminal 8 is connected to one end of the sensor 7; the other end of the outlet terminal 8 is connected to one end of the lightning rod 9; the other end of the lightning rod 9 is mounted on the frame 16 and connected to one end of the grounding switch 10; the other end of the grounding switch 10 is grounded. The outlet terminal 8 and the lightning arrester 9 are both located on the left side of the frame 16; the lightning arrester 9 is located below the sensor 7; and the grounding switch 10 is located below the frame 16.

[0035] In practical applications, the wind power-specific sealed pole circuit breaker further includes: a second copper bar 11; the second copper bar 11 is installed at one end of the current transformer 2, and the second copper bar 11 is connected to the incoming line terminal 1. The grounding switch 10 is connected to the second copper bar 11 when in the closed state.

[0036] When the wind power-specific sealed pole circuit breaker described in the present invention is in use, the high-voltage side power supply of the primary circuit passes through an external transformer, and the current enters from the incoming line terminal 1. It is detected by the current transformer 2 whether it is a normal current. If the detection is abnormal, it will be transmitted to the corresponding external current protection device for protection. If it is normal, it will flow into the sealed pole 4 through the first copper bar 3. The sealed pole 4 can achieve short-circuit current interruption through its vacuum arc extinguishing chamber, thereby protecting the current (the sealed pole 4 is only an execution device and cannot detect the operating status of the equipment). Under normal circumstances, the current flows out of the sealed pole 4 from the left end and passes through the isolating switch 5. The isolating switch 5 can be manually or after receiving an external signal, and the isolating knife 18 of the isolating switch 5 rotates counterclockwise to produce a clear disconnection with the sealed pole 4, thereby achieving the effect of breaking the entire circuit.

[0037] After the current flows through the isolating switch 5, it flows through the sensor 7, which detects whether the current is connected to the ground through the frame 16, thereby protecting the circuit breaker equipment, and then flows out from the outlet terminal 8. When the power is normally on, since the lightning arrester 9 has an extremely high resistance value, almost no current passes through the lightning arrester 9. When the voltage is too large, the resistance of the lightning arrester 9 will decrease sharply, causing the current to be grounded, thereby achieving a protective effect. If normal, the current will flow out from the outlet terminal 8 and flow to the cable. The function of the grounding switch 10 is that after the grounding switch 10 is manually closed, the grounding switch 10 is connected to the second copper bar 11 to guide the current into the ground, thereby achieving safety during inspection and maintenance. After closing the switch, the current passes in the above manner, and the sensor 7 and the current transformer 2 detect and transmit data to see if it is normal. If not, a disconnection operation will be performed.

[0038] The function of the spring operating mechanism 12 is to operate step by step under the five-protection interlocking safety operation required by the Chinese government to control the closing and opening of the circuit breaker, the closing and opening of the isolating switch, or the closing and opening of the grounding switch (all of the above can be operated manually). The opening and closing of the circuit breaker can be operated by external electric control.

[0039] The present invention adopts a sealed pole design, and the sealed pole 4 has a very high insulating rod capacity. It converts surface insulation into volume insulation, which reduces the impact of the environment compared to air insulation and greatly improves the insulation strength. And the adopted sealed pole 4 is a modular design, with a simple structure, few detachable parts and high reliability. Therefore, it can reduce the size of the circuit breaker, which is conducive to the miniaturization of the switch cabinet, reducing the cost of the switch cabinet and effectively reducing the floor space. Compared with the previous design that completely exposes the insulating shell of the vacuum arc chamber to the air, the sealed pole assembly adopted by the circuit breaker of the present invention does not need to worry about the problem of moisture pollution of external dust, and does not require any treatment. The sealed pole 4 can achieve great insulation performance, and there is no need to increase the length of the vacuum arc chamber to reduce pollution, so the required space is greatly reduced, and its integrated design can make the performance of the circuit breaker more stable. Under the protection of the sealed pole 4, all external factors are reduced to a minimum, and the working efficiency and life of the vacuum arc chamber are significantly improved.

[0040] The wind power-specific sealed pole circuit breaker of the present invention adopts a current transformer and a circuit breaker combined structure, which does not need to be replaced after use like a traditional fuse, so the cost is lower. In addition, the present invention adopts a current transformer for circuit breaker detection and protection, and adopts a circuit breaker for breaking, so the breaking current is larger, which can meet the large breaking current requirements of wind power equipment on the market.

[0041] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0042] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A wind power-specific sealed pole circuit breaker, characterized in that: The wind power-specific sealed pole circuit breaker comprises: a frame and a spring operating mechanism installed on the frame, a main shaft, a first insulating pull rod, a sealed pole, a first copper bus, a current transformer, a disconnector, a sensor, and a second insulating pull rod; The spring operating mechanism is installed in front of the frame; one end of the main shaft is installed above the spring operating mechanism, and the other end of the main shaft is installed above the rear support plate of the frame; one end of the first insulating pull rod is connected to the crank arm welded on the main shaft, and the other end of the first insulating pull rod is connected to one end of the sealed pole; the first insulating pull rod is located on the right side of the frame; the sealed pole runs through the left and right sides of the frame; one end of the sealed pole is also connected to one end of the first copper bar; the other end of the first copper bar is connected to one end of the current transformer; the other end of the current transformer is installed on the frame; the current transformer and the first copper bar are both located on the right side of the frame, and the current transformer is located below the sealed pole; The isolating switch comprises an isolating switch main shaft and an isolating knife; the isolating switch main shaft is located on the right side of the frame and between the current transformer and the sealed pole; the other end of the sealed pole is in contact with one end of the isolating knife; the other end of the isolating knife is movably connected to one end of the sensor; the other end of the sensor is mounted on the frame; one end of the second insulating pull rod is connected to the middle of the isolating knife, and the other end of the second insulating pull rod is connected to the isolating switch main shaft; the isolating knife, the second insulating pull rod and the sensor are all located on the left side of the frame; the second insulating pull rod is located below the sealed pole; the sensor is located below the second insulating pull rod; The wind power-specific sealed pole circuit breaker further includes: an incoming line terminal; the incoming line terminal is connected to one end of the current transformer; The wind power-specific sealed pole circuit breaker further comprises: an outlet terminal, a lightning arrester and a grounding switch; one end of the outlet terminal is connected to one end of the sensor; the other end of the outlet terminal is connected to one end of the lightning arrester; the other end of the lightning arrester is mounted on the frame and connected to one end of the grounding switch; the other end of the grounding switch is grounded; The outlet terminal and the lightning arrester are both located on the left side of the frame; the lightning arrester is located below the sensor; and the grounding switch is located below the frame; The wind power-specific sealed pole circuit breaker further includes: a second copper bar; the second copper bar is installed at one end of the current transformer, and the second copper bar is connected to the incoming line end; The grounding switch is connected to the second copper busbar when in a closed state; When the wind power-specific sealed pole circuit breaker is in use, the high-voltage side power supply of the primary circuit passes through an external transformer, and the current enters from the incoming line end. The current transformer detects whether it is a normal current. If the detection is abnormal, it will be transmitted to the corresponding external current protection device for protection. If it is normal, it will flow into the sealed pole through the first copper bar, and the sealed pole will realize the short-circuit current interruption through its vacuum arc extinguishing chamber. Under normal circumstances, the current flows out of the sealed pole from the left end and passes through the isolating switch. After the isolating switch is manually operated or receives an external signal, the isolating knife of the isolating switch rotates counterclockwise, and a clear disconnection is generated with the sealed pole, thereby achieving the effect of breaking the entire circuit. After the current flows through the isolating switch, it flows through the sensor, which will detect whether the current is connected to the ground through the frame, thereby protecting the circuit breaker equipment, and then flows out from the outlet terminal; when the power is normally on, due to the extremely high resistance value of the lightning arrester, almost no current passes through the lightning arrester; when the voltage is too large, the resistance of the lightning arrester will decrease sharply, causing the current to be grounded, thereby achieving a protective effect; if normal, the current will flow out from the outlet terminal and flow to the cable; and the function of the grounding switch is that after the grounding switch is manually closed, the grounding switch is connected to the second copper busbar to conduct the current into the ground, thereby achieving safety during inspection and maintenance; after closing the switch, the current passes in the above manner, and the sensor and current transformer detect and transmit data to see if it is normal, and if not, a breaking operation will be performed.

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