Disconnecting switch stationary contact

Abstract

This invention relates to the field of disconnector switch technology, addressing the challenge of arc protection and improving the long-term reliability of disconnector switch stationary contacts under harsh operating conditions. It includes a terminal block, a stationary contact base, contact fingers, and an arc-initiating assembly. The stationary contact base is vertically and fixedly connected to the terminal block. Two sets of contact fingers are fixed to the stationary contact base. The terminal block is fixedly connected to the supporting insulator of the disconnector switch. The arc-initiating assembly includes an arc-initiating rod and an arc-initiating bracket. The arc-initiating bracket is fixed to the stationary contact base. The lower end of the arc-initiating rod is hinged to the arc-initiating bracket. An arc-initiating spring is located between the bottom of the arc-initiating rod and the arc-initiating bracket. When the arc-initiating spring is at its natural length, the arc-initiating rod is in a vertical state. When the contact plate on the main switch's conductive arm contacts the contact fingers, the conductive arm contacts the arc-initiating rod, and the arc-initiating spring is compressed. During opening, after the contact fingers separate from the contact plate, the arc-initiating rod remains in contact with the conductive arm for a period of time to initiate an arc.

Description

Technical Field

[0001] This utility model relates to the field of disconnecting switch technology, specifically a stationary contact of a disconnecting switch. Background Technology

[0002] As a critical safety isolation device in power systems, the reliability of the stationary contacts of disconnecting switches directly affects the equipment's lifespan and operational safety. Currently, common disconnecting switch stationary contacts exhibit the following significant defects: (1) When the traditional stationary contact is opened, a strong electric arc is easily generated at the moment of separation between the moving and stationary contacts. If the arc cannot be quickly drawn away from the contact area, it will lead to contact finger ablation, increased contact resistance, and even short circuit failure of the equipment. The existing arc-initiating structure is mostly a fixed design, which makes it difficult to maintain an effective arc-initiating path in the early stage of opening, and the arc energy is easily concentrated on the contact surface of the contact finger. (2) The stationary contact is exposed to the outdoors for a long time, and rainwater and dust can easily penetrate into the gap between the contact fingers. The existing protective structure is mostly a simple baffle or a fully enclosed cover. The former cannot effectively prevent oblique rainwater from penetrating, while the latter hinders the heat dissipation of the contact and increases the difficulty of maintenance. (3) During the closing process of the main switch, the conductive arm is prone to displacement or vibration due to imperfect guiding structure, resulting in uneven contact pressure between the contact plate and the contact finger, which accelerates the wear of the contact. Although some designs add buffer components, they are mostly separated from the arc-initiating function, resulting in redundant structure and poor coordination. Utility Model Content

[0003] The purpose of this invention is to provide a stationary contact of a disconnecting switch, which solves the problem of arc protection by optimizing the dynamic delay separation mechanism of the arc-initiating component and improves the long-term reliability of the stationary contact of the disconnecting switch under harsh working conditions.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: A stationary contact of a disconnecting switch includes a terminal block, a stationary contact base, contact fingers, and an arc-initiating assembly. The stationary contact base is vertically and fixedly connected to the terminal block. Two sets of contact fingers are fixedly mounted on the stationary contact base. The terminal block is fixedly connected to the supporting insulator of the disconnecting switch. The arc-initiating assembly includes an arc-initiating rod and an arc-initiating bracket. The arc-initiating bracket is fixed to the stationary contact base. The lower end of the arc-initiating rod is hinged to the arc-initiating bracket. An arc-initiating spring is located between the bottom of the arc-initiating rod and the arc-initiating bracket. When the arc-initiating spring is at its natural length, the arc-initiating rod is in a vertical state. When the contact plate on the conductive arm of the main switch contacts the contact fingers, the conductive arm contacts the arc-initiating rod, and the arc-initiating spring is in a compressed state. When the switch is opened, after the contact fingers separate from the contact plate, the arc-initiating rod and the conductive arm remain in contact for a period of time to achieve arc initiation.

[0005] Furthermore, the stationary contact base and the terminal block are fixedly connected by several support plates.

[0006] Furthermore, the bottom of the terminal block has a transition bracket with a flange for fixed connection with the supporting insulator.

[0007] Furthermore, the transition bracket also has an extension plate, the first end of which is fixedly connected to the flange, and the second end of which is fixed with a grounding contact.

[0008] Furthermore, it also includes guide plates, which are two symmetrically arranged pieces. The guide plates are fixedly connected to the stationary contact seat and located on the same side of several contact fingers in the same group. The two guide plates form an inverted V-shape. The conductive arm of the main switch moves down between the two guide plates until the contact plate contacts the contact finger.

[0009] Furthermore, a flexible buffer block is fixed on the stationary contact seat, and the buffer block is located on the same side of the guide plate and the contact finger and is set closer to the guide plate.

[0010] Furthermore, the terminal block has equalizing rings on both sides, and the equalizing rings are fixedly connected to the terminal block by rods.

[0011] Furthermore, the arc-initiating bracket has a "∟" shaped structure, the vertical part of the arc-initiating bracket is fixedly connected to the stationary contact seat, and the arc-initiating rod is hinged to the horizontal part of the arc-initiating bracket.

[0012] Furthermore, the vertical portion of the arc-initiating bracket has a guide rod, the bottom of the arc-initiating rod has a fixing bolt, the first end of the arc-initiating spring is fixedly connected to the guide rod, and the second end of the arc-initiating spring is fixedly connected to the fixing bolt.

[0013] Furthermore, a rain cover is fixed on the stationary contact base to provide semi-enclosed protection for the contact fingers.

[0014] The beneficial effects of this utility model are: by optimizing the dynamic delay separation mechanism of the arc-initiating component, when the moving contact on the conductive arm separates from the contact finger of the stationary contact of this utility model, the arc-initiating rod of the arc-initiating component still maintains contact with the arc-initiating ball on the conductive arm, thereby realizing the arc-initiating function and solving the problem of arc protection. Attached Figure Description

[0015] Figure 1 This is a three-dimensional view of the present invention; Figure 2 These are three-dimensional drawings of some components of this utility model; Figure 3 This is a front view of the arc-initiating component of this utility model; In the diagram: 1. Terminal block, 11. Support plate, 2. Static contact seat, 3. Contact finger, 4. Guide plate, 5. Rain cover, 6. Arc ignition assembly, 61. Arc ignition rod, 62. Arc ignition bracket, 63. Fixing bolt, 64. Guide rod, 65. Arc ignition spring, 7. Transition bracket, 71. Flange, 72. Extension plate, 8. Buffer block, 9. Equalizing ring, 10. Grounding contact. Detailed Implementation

[0016] like Figures 1 to 3 As shown, the stationary contact of the disconnecting switch of this utility model includes a terminal block 1, a stationary contact base 2, a contact finger 3, a guide plate 4, a rain cover 5, an arc-starting assembly 6, a transition bracket 7, a buffer block 8, an equalizing ring 9, and a grounding contact 10. The structure and working principle of the utility model will be described in detail below with reference to the accompanying drawings.

[0017] like Figures 1 to 3 As shown, the stationary contact of the disconnecting switch includes a terminal block 1, a stationary contact base 2, contact fingers 3, and an arc-starting assembly 6. The terminal block 1 is the basic component of the stationary contact of the disconnecting switch. The stationary contact base 2 is located above the terminal block 1, and a support plate 11 is located between the terminal block 1 and the stationary contact base 2. Figure 2 As shown, the support plate 11 is inclined, and its arrangement secures the connection between the terminal block 1 and the stationary contact base 2, making them a single unit. The contact fingers 3 are arranged in two sets symmetrically on the top of the stationary contact base 2. Each set consists of several contact fingers 3 arranged at equal intervals. The first end of each contact finger 3 is fixedly connected to the stationary contact base 2, and the second end of each contact finger 3 is used to contact the contact plate on the main switch to achieve closing. The structure, assembly, and function of the contact fingers 3 are existing technologies and will not be described in detail here.

[0018] Two guide plates 4 are symmetrically distributed on the top of the stationary contact seat 2. The lower end of the guide plate 4 is fixedly connected to the stationary contact seat 2, and the guide plate 4 is located on the same side of several contact fingers 3 in each group. The two guide plates 4 form an inverted V-shape structure. The guide plates 4 are designed to guide the contact plate on the main switch to smoothly enter between the two groups of contact fingers 3. At the same time, the shape and installation position of the guide plates 4 should ensure that the contact plate is squeezed and the pressure is even between the contact fingers 3 after entering between the two groups of contact fingers 3, so as to ensure contact.

[0019] The buffer block 8 is fixed to the top of the stationary contact seat 2. The buffer block 8 is located on the same side as the contact finger 3 and the guide plate 4, but closer to the guide plate 4. The buffer block 8 is also located in the area between the two guide plates 4, and is made of rubber. After the buffer block 8 contacts the conductive arm of the main switch, it limits the conductive arm, at which point the contact plate is positioned optimally between the two sets of contact fingers 3. Furthermore, the buffer block 8 also cushions the conductive arm during its descent.

[0020] To protect the contact fingers 3, two symmetrically arranged rain covers 5 are fixed to the side wall of the stationary contact base 2. Each of the two sets of contact fingers 3 corresponds to one of the two rain covers 5, and the rain covers 5 are located outside the corresponding contact fingers 3, thus protecting them. The rain covers 5 provide semi-enclosed protection for the contact fingers 3. That is, they protect the contact fingers 3 from above, below, left, right, and outside, but the inner side of the contact fingers 3 is exposed to contact the contact plate.

[0021] like Figure 1 As shown, equalizing rings 9 are provided on both sides of the stationary contact base 2. The equalizing rings 9 are fixedly connected to the stationary contact base 2 through rods. The equalizing rings 9 are used to prevent discharge phenomena from occurring.

[0022] like Figure 1 As shown, an arc-inducing assembly 6 is also fixed on the top of the stationary contact base 2, and the arc-inducing assembly 6 is located to the side of one set of contact fingers 3. Figure 3 As shown, the arc-initiating assembly 6 includes an arc-initiating rod 61, an arc-initiating bracket 62, a fixing bolt 63, a guide rod 64, and an arc-initiating spring 65. The arc-initiating bracket 62 has a "∟" shaped structure. The vertical part of the arc-initiating bracket 62 is fixedly connected to the stationary contact seat 2, and the horizontal part of the arc-initiating bracket 62 is located above the stationary contact seat 2. The lower end of the arc-initiating rod 61 is rotatably connected to the horizontal part of the arc-initiating bracket 62. The lower end of the arc-initiating rod 61 is also fixed with a fixing bolt 63, but the connection point between the fixing bolt 63 and the arc-initiating rod 61 is located below the connection point between the arc-initiating rod 61 and the arc-initiating bracket 62. A guide rod 64 is fixedly fixed on the vertical part of the arc-initiating bracket 62. The first end of the arc-initiating spring 65 is fixedly connected to the guide rod 64, and the second end of the arc-initiating spring 65 is fixedly connected to the fixing bolt 63. In this way, the arc-initiating spring 65 provides a certain preload between the arc-initiating rod 61 and the arc-initiating bracket 62. The arc-initiating rod 61 has a curved structure, with the lower half vertical and the upper half inclined. Since the arc-initiating device is located laterally on one set of contact fingers 3, and this set of contact fingers 3 is situated between the arc-initiating assembly 6 and the corresponding guide plate 4, the arc-initiating assembly 6 also provides a certain guiding function for the conductive arm of the main switch. The main function of the arc-initiating assembly 6 is that, during opening, after the contact plate on the conductive arm separates from the contact fingers 3, the arc-initiating rod 61 remains in contact with the arc-initiating ball at the second end of the conductive arm for a period of time under the action of the arc-initiating spring 65, thereby transferring current during opening.

[0023] To achieve grounding, such as Figure 1 , Figure 2 As shown, a transition bracket 7 is fixed to the bottom of the terminal block 1. The transition bracket 7 includes a flange 71 and an extension plate 72. The first end of the extension plate 72 is fixedly connected to the side wall of the flange 71. The flange 71 is used for fixed connection to the supporting insulator of the disconnecting switch. A grounding contact 10 is fixed to the second end of the extension plate 72. Grounding is achieved when the grounding contact 10 contacts the grounding switch of the disconnecting switch.

[0024] The advantages of this invention are as follows: By optimizing the dynamic delay separation mechanism of the arc-initiating assembly, after the moving contact on the conductive arm separates from the contact finger of the stationary contact, the arc-initiating rod of the arc-initiating assembly remains in contact with the arc-initiating ball on the conductive arm, thereby achieving the arc-initiating function and solving the problem of arc protection. Simultaneously, the semi-enclosed rain cover design effectively prevents oblique rainwater penetration, and the semi-enclosed structure does not hinder heat dissipation from the contact finger. This invention simultaneously solves the problems of poor arc protection and environmental adaptability, improving the reliability of the isolating switch stationary contact under long-term harsh environments.

Claims

1. A disconnector stationary contact, comprising a terminal block, a stationary contact base, contact fingers, and an arc-starting assembly, characterized in that, The stationary contact base and the terminal block are vertically and fixedly connected. The contact fingers are in two sets and fixed on the stationary contact base. The terminal block is fixedly connected to the supporting insulator of the disconnecting switch. The arc-initiating assembly includes an arc-initiating rod and an arc-initiating bracket. The arc-initiating bracket is fixed on the stationary contact base. The lower end of the arc-initiating rod is hinged to the arc-initiating bracket. An arc-initiating spring is located between the bottom of the arc-initiating rod and the arc-initiating bracket. When the arc-initiating spring is at its natural length, the arc-initiating rod is in a vertical state. When the contact plate on the conductive arm of the disconnecting switch contacts the contact fingers, the conductive arm contacts the arc-initiating rod and the arc-initiating spring is in a compressed state. When the switch is opened, after the contact fingers separate from the contact plate, the arc-initiating rod and the conductive arm remain in contact for a period of time to achieve arc initiation.

2. The stationary contact of the disconnector according to claim 1, characterized in that, The stationary contact base and the terminal block are fixedly connected by several support plates.

3. The stationary contact of the disconnector according to claim 1, characterized in that, The bottom of the terminal block has a transition bracket, and the transition bracket has a flange for fixed connection with the support insulator.

4. The stationary contact of the disconnector according to claim 3, characterized in that, The transition bracket also has an extension plate, the first end of which is fixedly connected to the flange, and the second end of which is fixed with a grounding contact.

5. The stationary contact of the disconnector according to claim 1, characterized in that, It also includes guide plates, which are two symmetrically arranged. The guide plates are fixedly connected to the stationary contact seat and located on the same side of several contact fingers in the same group. The two guide plates form an inverted V-shape. The conductive arm of the main switch moves down between the two guide plates until the contact plate contacts the contact finger.

6. The stationary contact of the disconnector according to claim 1, characterized in that, A flexible buffer block is fixed on the stationary contact seat. The buffer block is located on the same side of the guide plate and the contact finger and is positioned closer to the guide plate.

7. The stationary contact of the disconnector according to claim 1, characterized in that, The terminal block has equalizing rings on both sides, and the equalizing rings are fixedly connected to the terminal block by rods.

8. The stationary contact of the disconnector according to claim 1, characterized in that, The arc-initiating bracket has a "∟" shaped structure. The vertical part of the arc-initiating bracket is fixedly connected to the stationary contact seat, and the arc-initiating rod is hinged to the horizontal part of the arc-initiating bracket.

9. The stationary contact of the disconnector according to claim 8, characterized in that, The vertical part of the arc-initiating bracket has a guide rod, the bottom of the arc-initiating rod has a fixing bolt, the first end of the arc-initiating spring is fixedly connected to the guide rod, and the second end of the arc-initiating spring is fixedly connected to the fixing bolt.

10. The stationary contact of the disconnector according to claim 1, characterized in that, A rain cover is fixed on the stationary contact seat to provide semi-enclosed protection for the contact fingers.

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