A double-break solid insulation circuit breaker for ring main units

Abstract

The application relates to a double-break solid insulation circuit breaker for a ring network cabinet, which comprises a shell, an isolated static contact, a lower outgoing line and a grounding contact fixed in the shell, and an isolation blade rotatably connected in the shell, both ends of the isolation blade being provided with contact heads, and the contact heads at both ends of the isolation blade forming an included angle alpha; wherein the isolated static contact, the lower outgoing line and the grounding contact are sequentially arranged in a circumferential direction around the rotation axis of the isolation blade, and the isolation blade rotates between the isolated static contact, the lower outgoing line and the grounding contact to conduct the lower outgoing line and the isolated static contact or the lower outgoing line and the grounding contact or none. The application has the advantages of simple and reliable structure, rapid on-off action, meeting the 79kV isolation break test requirement and meeting the 24kV national standard requirement.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and in particular to a double-break solid-insulated circuit breaker for ring main units. Background Technology

[0002] Currently, my country's power distribution network is developing rapidly, and various ring main units (RMMs) have seen significant improvements in innovation and application. The main types used are air-insulated RMMs, SF6-insulated RMMs, and solid-insulated RMMs. With increasing global emphasis on environmental protection, air-insulated and solid-insulated RMMs have demonstrated certain advantages.

[0003] However, due to the influence of ambient temperature and altitude, the circuit breakers in air-insulated ring main units will experience a decrease in insulation and arc-extinguishing performance as the air pressure decreases. Currently, the transmission form of the isolating blade of the circuit breaker is a single-break form, which has limited withstand voltage performance and is prone to related power failures under overvoltage or insulation degradation conditions. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a double-break solid-insulated circuit breaker for ring main units to solve the above problems.

[0005] The technical solution of this invention is implemented as follows: a double-break solid-insulated circuit breaker for ring main units, comprising, The housing contains an isolation stationary contact, a bottom lead, and a grounding contact. An isolation blade is rotatably connected inside a housing. Both ends of the isolation blade are provided with contacts, and the two contacts of the isolation blade form an included angle α. The isolating stationary contact, the lower lead wire, and the grounding contact are arranged circumferentially around the rotation axis of the isolating blade. The isolating blade rotates between the isolating stationary contact, the lower lead wire, and the grounding contact, thereby connecting the lower lead wire and the isolating stationary contact, connecting the lower lead wire and the grounding contact, or not connecting either of them.

[0006] By adopting the above technical solution, when the isolating blade is in the open state, neither end is connected to the isolating stationary contact, the lower outgoing line, or the grounding contact, thereby effectively improving the electrical clearance between the contacts and enhancing their insulation performance. When the isolating blade is rotated to connect the lower outgoing line and the isolating stationary contact at both ends, it is in the isolating closed state. When the two ends of the isolating blade are connected to the conducting lower outgoing line and the grounding contact at both ends, it is in the grounding closed state. The structure is simple and reliable, the opening and closing actions are rapid, and it can meet the 79kV isolation break test requirements and comply with the 24kV national standard requirements.

[0007] The invention is further configured such that: the isolation blade includes a fixing part and contact heads disposed at both ends of the fixing part, and the two contact heads form an included angle α.

[0008] The present invention is further configured such that the included angle α is set to 88°-92°.

[0009] The present invention is further configured such that the included angle α is set to 90°.

[0010] By adopting the above technical solution, the distance between the isolating stationary contact, the bottom lead and the grounding contact can be increased, resulting in better electrical clearance and insulation performance. At the same time, the volume of the isolating blade and the housing can be reduced while ensuring insulation performance, thus miniaturizing them.

[0011] The present invention is further configured to include: An isolating blade holder is rotatably connected to the housing via a rotating shaft. The fixing part of the isolating blade is fixed on the isolating blade holder, and the contact head protrudes from the isolating blade holder. A pull rod, one end of which is rotatably connected to the isolation knife clamp, and the other end of which extends out of the housing and is connected to the drive mechanism.

[0012] By adopting the above technical solution, the drive mechanism drives the isolating blade clamp to rotate around the pivot shaft via the pull rod, thereby driving the isolating blade to move between the various contacts, so that it switches between the open, isolating and closing and grounding closing states.

[0013] The invention is further configured such that: two isolation blades are provided and are respectively provided on both sides of the isolation blade clamp, and a clamping space is formed between the adjacent ends of the two isolation blades for clamping the isolation stationary contact, the lower lead wire and the grounding contact.

[0014] By adopting the above technical solution, the isolation blade can be clamped in the form of two blades, which improves the stability during connection.

[0015] The present invention is further configured such that: a limiting plate protrudes from the upper side of both the isolating stationary contact and the grounding contact to limit the rotation path of the isolating blade; when one end of the isolating blade abuts against the limiting plate, the other end is connected to the lower outgoing line.

[0016] By adopting the above technical solution, the limiting plate can effectively limit the movement of the isolation blade, so that when one end of the isolation blade abuts against the limiting plate, the other end can connect with the center position of the lower outlet line, thus improving the stability of the connection. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the isolation blade in the present invention; Figure 4 This is a front view of the isolation blade structure in this invention; Figure 5 The results of the lightning strike test of this invention (positive polarity); Figure 6 The results of the lightning strike test of this invention (negative polarity); Figure 7 This is a simulation of the electric field for the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1-4As shown, this invention discloses a double-break solid-insulated circuit breaker for ring main units, comprising a housing 1 and an isolating blade 5. An isolating stationary contact 2, a lower lead wire 3, and a grounding contact 4 are fixed within the housing 1. The isolating blade 5 is rotatably connected within the housing 1, and both ends of the isolating blade 5 are provided with contacts forming an included angle α. The isolating stationary contact 2, the lower lead wire 3, and the grounding contact 4 are arranged circumferentially around the rotation axis of the isolating blade 5. The isolating blade 5 rotates between the isolating stationary contact 2, the lower lead wire 3, and the grounding contact 4, thereby either connecting the lower lead wire 3 and the isolating stationary contact 2, connecting the lower lead wire 3 and the grounding contact 4, or neither of them can conduct. When the isolating blade 5 is in the open state, neither end is connected to the isolating stationary contact 2, the lower outgoing line 3, or the grounding contact 4, thereby effectively improving the electrical clearance between the contacts and enhancing its insulation performance. When the isolating blade 5 is rotated to connect the lower outgoing line 3 and the isolating stationary contact 2 respectively, it is in the isolating closed state. When the two ends of the isolating blade 5 are connected to the conducting lower outgoing line 3 and the grounding contact 4 respectively, it is in the grounding closed state. The structure is simple and reliable, the opening and closing action is rapid, and it can meet the 79kV isolation break test requirements and comply with the 24kV national standard requirements.

[0021] In this embodiment of the invention, the isolation blade 5 includes a fixing part 50 and contact heads 51 disposed at both ends of the fixing part 50, and the two contact heads 51 form an included angle α.

[0022] In this embodiment of the invention, the included angle α is set to 88°-92°.

[0023] In this embodiment of the invention, the included angle α is set to 90°.

[0024] It can increase the distance between the isolating stationary contact 2, the lower lead 3 and the grounding contact 4, making their electrical clearance and insulation performance better. It can also reduce the volume of the isolating blade 5 and the housing 1 while ensuring insulation performance, thus making them miniaturized.

[0025] In this embodiment of the invention, an isolating blade clip 6 and a pull rod 7 are also included. The isolating blade clip 6 is rotatably connected to the housing 1 via a rotating shaft 60. The fixing part 50 of the isolating blade 5 is fixed to the isolating blade clip 6, and the contact head 51 protrudes from the isolating blade clip 6. One end of the pull rod 7 is rotatably connected to the isolating blade clip 6, and the other end extends out of the housing 1 and connects to the drive mechanism. The drive mechanism drives the isolating blade clip 6 to rotate around the rotating shaft 60 via the pull rod 7, thereby driving the isolating blade 5 to move between the various contacts, switching it between the open, isolating, and grounding states.

[0026] In this embodiment of the invention, two isolation blades 5 are provided and respectively located on both sides of the isolation blade clamp 6. A clamping space 52 is formed between the adjacent ends of the two isolation blades 5 for clamping the isolation stationary contact 2, the lower lead wire 3, and the grounding contact 4. This allows the isolation blades 5 to be clamped in a double-blade manner, improving the stability during connection.

[0027] In this embodiment of the invention, both the isolating stationary contact 2 and the grounding contact 4 have a protruding limiting plate 8 on their upper sides, which is used to restrict the rotation path of the isolating blade 5. When one end of the isolating blade 5 abuts against the limiting plate 8, the other end is connected to the lower outgoing line 3. The limiting plate 8 can effectively limit the movement of the isolating blade 5, so that when one end of the isolating blade 5 abuts against the limiting plate 8, the other end can be connected to the center position of the lower outgoing line 3, thereby improving the stability of the connection.

[0028] like Figures 5-6 As shown, in this embodiment of the invention, the conditions for the lightning strike test are as follows: high voltage is input on the lower output side of the pole, and the upper output side is grounded; the peak voltage of the test is 145kV for the positive polarity and 145kV for the negative polarity. T1=1.2 (±30%), T2=50 (±20%).

[0029] like Figure 7 In this embodiment of the invention, the conditions for simulating the electric field are: the input voltage on the outgoing line side is 79kV, the upper outgoing line side is grounded at 0V, and the electric field strength is 4.0E+06 [V / m].

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A double-break solid-insulated circuit breaker for ring main units, characterized in that, include, Housing (1), wherein an isolating stationary contact (2), a lower lead wire (3) and a grounding contact (4) are fixed inside the housing (1); Isolation blade (5), the isolation blade (5) is rotatably connected in the housing (1), and both ends of the isolation blade (5) are provided with contacts, and the two ends of the isolation blade (5) form an included angle α; The isolating stationary contact (2), the lower lead (3) and the grounding contact (4) are arranged circumferentially around the rotation axis of the isolating blade (5). The isolating blade (5) rotates between the isolating stationary contact (2), the lower lead (3) and the grounding contact (4) to conduct the lower lead (3) and the isolating stationary contact (2), or conduct the lower lead (3) and the grounding contact (4), or neither conducts.

2. A double-break solid-insulated circuit breaker for ring main units according to claim 1, characterized in that, The isolation blade (5) includes a fixing part (50) and contact heads (51) provided at both ends of the fixing part (50), and the two contact heads (51) form an included angle α.

3. A double-break solid-insulated circuit breaker for a ring main unit according to claim 1 or 2, characterized in that, The included angle α is set to 88°-92°.

4. A double-break solid-insulated circuit breaker for a ring main unit according to claim 1 or 2, characterized in that, The included angle α is set to 90°.

5. A double-break solid-insulated circuit breaker for ring main units according to claim 2, characterized in that, Also includes: Isolation blade clip (6), the isolation blade clip (6) is rotatably connected to the housing (1) through a rotating shaft (60), the fixing part (50) of the isolation blade (5) is fixed on the isolation blade clip (6), and the contact head (51) protrudes out of the isolation blade clip (6). A pull rod (7) is rotatably connected at one end to an isolation blade clamp (6) and at the other end extends out of the housing (1) to connect to a drive mechanism.

6. A double-break solid-insulated circuit breaker for a ring main unit according to claim 5, characterized in that, Two isolation blades (5) are provided and are respectively located on both sides of the isolation blade clamp (6). A clamping space (52) is formed between the adjacent ends of the two isolation blades (5) for clamping the isolation stationary contact (2), the lower lead wire (3) and the grounding contact (4).

7. A double-break solid-insulated circuit breaker for ring main units according to claim 1, characterized in that, The upper side of both the isolating stationary contact (2) and the grounding contact (4) is provided with a limiting plate (8) to restrict the rotation path of the isolating blade (5). When one end of the isolating blade (5) abuts against the limiting plate (8), the other end is connected to the lower outgoing line (3).

Images