Technological method for improving electrical contact performance of petal-shaped contact

Abstract

The invention discloses a process method for improving the electrical contact performance of a petal-shaped contact, and relates to the technical field of high-voltage circuit breakers. Comprising the following steps that a moving contact is manufactured, and the outer surface of the moving contact is a cylindrical surface; manufacturing petal-shaped static contact fingers, wherein the number of the petal-shaped static contact fingers is more than 1.3 times of that of the petal-shaped static contact fingers of the same type of high-voltage circuit breaker; the contact surface of the petal-shaped static contact finger and the moving contact is an arc surface, the radius of the arc surface is larger than that of the moving contact, and the difference between the radius of the arc surface and the radius of the moving contact is smaller than or equal to 0.05 mm; and manufacturing a static contact seat, and installing the plurality of petal-shaped static contact fingers in the static contact seat in an annular array. By controlling the adaptation degree of the electric contact part between the moving contact and the static contact, increasing the position amount of electric contact, increasing the contact pressure between the contacts and the like, the risk of scratching between the contacts is avoided, the electric contact effect between the contact fingers and the contacts is greatly improved, the problem that the loop resistance exceeds the standard is effectively solved, the reliability of the circuit breaker is remarkably improved, and the service life of the circuit breaker is prolonged. Therefore, the fault risk of the power grid is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage circuit breakers, and in particular to a process for improving the electrical contact performance of a petal-shaped contact. Background Art

[0002] The conductive circuit of a high-voltage circuit breaker is a complete conductive path composed of several conductive parts connected and combined. The circuit resistance value characterizes the conductive circuit connection effect. The circuit resistance mainly includes three aspects: the inherent resistance of the conductor, the connection resistance between the conductor and the contact, and the contact resistance between the moving and static contacts. Under normal circumstances, the inherent resistance of the conductor is fixed and generally does not change; the connection resistance is the resistance at the fixed connection of the relevant conductive parts, and it will not change except in special circumstances; the contact resistance is the resistance of the contact part between the moving and static contacts in the arc extinguishing chamber. Since the moving and static contacts often change their positions in the state of separation and connection, the contact surface will increase the contact resistance due to various circumstances. The general contact structure of the moving and static contacts is the sliding contact between the contact fingers and the contacts. The existing structure has serious scratches and ablation of the contacts in the long-term operation of the circuit breaker, which leads to excessive circuit resistance, especially for reactive compensation circuit breakers used for switching capacitors and reactors in power grids. The working conditions are frequently operated, and the surge current is large or there is a large overvoltage between the fractures during operation, which will cause serious abrasion of the contacts and produce a lot of arc decomposition products. At present, a large number of reactive power compensation circuit breakers are in operation in my country's power grid. After long-term and multiple operations, the circuit resistance exceeds the standard and faults occur frequently. One of the important reasons is the unreasonable structure of the electrical contact between the contacts. Solving the problem of excessive circuit resistance of reactive power compensation circuit breakers is a difficult problem that has plagued the power industry. It has been difficult to solve and break through for a long time, resulting in the maintenance and dismantling of a large number of reactive power compensation circuit breakers, which has caused hidden dangers to the safe and stable operation of the power grid and brought trouble to the maintenance of the power grid. Conventional contact fingers are generally manufactured by stamping or self-pressing. Due to problems with the processing method, point contact between the contacts often occurs. The main reason for contact scratches is point contact, which is equivalent to drawing a mark on the metal surface with a sharp tool. How to improve the point contact method of the contact is an effective way to solve contact scratches.

[0003] As we all know, the contact is the load-bearing component of the circuit breaker for closing and breaking current, which directly determines the service life and reliability of the circuit breaker. Therefore, improving the electrical contact performance of the contact is an effective way to solve the problem of excessive resistance in the circuit of the reactive compensation circuit breaker. Summary of the invention

[0004] The main purpose of the present invention is to provide a process for improving the electrical contact performance of a petal-type contact, so as to solve the above-mentioned problem.

[0005] To achieve the above object, the present invention provides a process for improving the electrical contact performance of a petal-type contact, comprising the following steps:

[0006] S1. Manufacturing a moving contact, wherein the outer surface of the moving contact is a cylindrical surface;

[0007] S2. Manufacturing petal-shaped static contact fingers, wherein the number of the petal-shaped static contact fingers is 1.3 times or more of the number of petal-shaped static contact fingers of the same type of high-voltage circuit breaker; the contact surface between the petal-shaped static contact fingers and the moving contact is an arc surface, the radius of the arc surface is greater than the radius of the moving contact, and the difference between the radius of the arc surface and the radius of the moving contact is less than or equal to 0.05 mm;

[0008] S3. Make a stationary contact seat, and install a plurality of petal-shaped stationary contact fingers in a ring array in the stationary contact seat.

[0009] Furthermore, in step S2, the petal-shaped static contact fingers are designed according to the diameter of the moving contact, the width of the petal-shaped static contact fingers is greater than 5 mm, and the spacing between two adjacent petal-shaped static contact fingers is greater than 1 mm. Under the premise of meeting the above size requirements, the maximum number of petal-shaped static contact fingers are designed.

[0010] Furthermore, a mounting hole is provided on the outer side of the petal-shaped stationary contact finger, and an elastic member is installed in the mounting hole. The elastic member is used to make the petal-shaped stationary contact finger closely contact with the moving contact.

[0011] Furthermore, the inner ends of the petal-shaped static contact finger are provided with mounting protrusions and contact protrusions protruding inwardly, and the arc surface is provided on the contact protrusions.

[0012] Furthermore, the mounting holes and elastic members are provided in plurality.

[0013] Furthermore, the elastic member is a compression spring.

[0014] The present invention has the following beneficial effects:

[0015] By adopting process methods such as controlling the adaptability of the electrical contact points between the moving and static contacts, increasing the position of the electrical contact, and increasing the contact pressure between the contacts, the risk of scratches between the contacts is fundamentally avoided, the electrical contact effect between the contact fingers and the contacts is greatly improved, and the problem of excessive loop resistance is effectively solved. The reliability of the circuit breaker is significantly improved, thereby reducing the risk of power grid failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an assembly cross-sectional view of the moving contact and the stationary contact of the present invention.

[0017] Figure 2 It is a three-dimensional diagram of the moving contact and the stationary contact of the present invention.

[0018] Figure 3It is a schematic diagram of the petal-shaped stationary contact finger and the elastic member of the present invention.

[0019] Figure 4 It is a schematic diagram of the petal-type static contact finger of the present invention.

[0020] Among them, 1 is a moving contact; 2 is a petal-shaped static contact finger; 3 is a static contact seat; 4 is an elastic member; 21 is a mounting hole; 22 is a mounting protrusion; 23 is a contact protrusion; 24 is an arc surface. DETAILED DESCRIPTION

[0021] In order to achieve the above-mentioned purpose and effect, the technical means and structures adopted by the present invention are described in detail with reference to the accompanying drawings for the features and functions of the preferred embodiments of the present invention.

[0022] like Figure 1-Figure 4 As shown, the present invention provides a process for improving the electrical contact performance of a petal-type contact, comprising the following steps:

[0023] S1, manufacturing a moving contact 1, wherein the outer surface of the moving contact 1 is turned into a cylindrical surface;

[0024] S2. Make petal-shaped static contact fingers 2, which are formed by turning and cutting. The number of petal-shaped static contact fingers 2 is more than 1.3 times the number of petal-shaped static contact fingers of the same type of high-voltage circuit breaker; the contact surface between the petal-shaped static contact fingers 2 and the moving contact 1 is an arc surface 24, the radius R2 of the arc surface 24 is greater than the cylindrical radius R1 of the moving contact 1, and the difference between the radius R2 of the arc surface 24 and the cylindrical radius R1 of the moving contact 1 is less than or equal to 0.05mm; the adaptability of the electrical contact part between the petal-shaped static contact fingers 2 and the moving contact 1 is accurately controlled by mechanical processing, so as to effectively realize the line contact effect between the contacts and minimize the wear between the contacts.

[0025] S3, manufacturing a stationary contact seat 3, and installing a plurality of petal-shaped stationary contact fingers 2 in a circular array in the stationary contact seat 3.

[0026] In another embodiment, in step S2, the petal-shaped static contact finger 2 is designed according to the diameter of the moving contact 1, the width of the petal-shaped static contact finger 2 is greater than 5 mm, and the spacing between two adjacent petal-shaped static contact fingers 2 is greater than 1 mm. Under the premise of meeting the above-mentioned size requirements, the maximum number of petal-shaped static contact fingers 2 is designed. The quality of the conductive effect between the contacts is directly related to the number of contact points, so increasing the position amount of the electrical contact of the contacts is an important way to improve the electrical contact performance. The present invention increases the number of petal-shaped static contact fingers 2 by reducing the gap and width of the petal-shaped static contact fingers 2, thereby increasing the position amount of the electrical contact.

[0027] In another embodiment, a mounting hole 21 is provided on the outer side of the flap-shaped stationary contact finger 2, and an elastic member 4 is installed in the mounting hole 21, and the elastic member 4 is used to make the flap-shaped stationary contact finger 2 and the moving contact 1 in close contact. The contact pressure between the flap-shaped stationary contact finger 2 and the moving contact 1 is increased by the elastic member 4, thereby greatly improving the electrical contact performance.

[0028] In another embodiment, two inner ends of the petal-shaped stationary contact finger 2 are provided with inwardly protruding mounting protrusions 22 and contact protrusions 23 , and the arc surface 24 is provided on the contact protrusions 23 .

[0029] In another embodiment, the elastic member 4 is a compression spring, and a plurality of the mounting holes 21 and the elastic member 4 are provided. By increasing the number and compression amount of the springs, the contact between the petal-shaped static contact finger 2 and the moving contact 1 is made closer, so as to achieve optimal conduction.

[0030] The above descriptions are only preferred embodiments of the present invention, not all embodiments. Anyone should be aware that any structural changes made under the inspiration of the present invention, and any technical solutions that are the same or similar to the present invention, belong to the protection scope of the present invention.

Claims

1. A process for improving the electrical contact performance of a petal-type contact, characterized in that: The following steps are involved: S1. Manufacturing a moving contact, wherein the outer surface of the moving contact is a cylindrical surface; S2. Manufacturing petal-shaped static contact fingers, wherein the number of the petal-shaped static contact fingers is 1.3 times or more of the number of petal-shaped static contact fingers of the same type of high-voltage circuit breaker; the contact surface between the petal-shaped static contact fingers and the moving contact is an arc surface, the radius of the arc surface is greater than the radius of the moving contact, and the difference between the radius of the arc surface and the radius of the moving contact is less than or equal to 0.05 mm; S3. Make a stationary contact seat, and install a plurality of petal-shaped stationary contact fingers in a ring array in the stationary contact seat.

2. A process for improving the electrical contact performance of a petal-type contact as claimed in claim 1, characterized in that: In step S2, the petal-shaped static contact fingers are designed according to the diameter of the moving contact, the width of the petal-shaped static contact fingers is greater than 5 mm, and the spacing between two adjacent petal-shaped static contact fingers is greater than 1 mm. Under the premise of meeting the above size requirements, the maximum number of petal-shaped static contact fingers is designed.

3. A process for improving the electrical contact performance of a petal-type contact as claimed in claim 1 or 2, characterized in that: The outer side of the petal-shaped stationary contact finger is provided with a mounting hole, and an elastic member is installed in the mounting hole. The elastic member is used to make the petal-shaped stationary contact finger closely contact with the moving contact.

4. A process for improving the electrical contact performance of a petal-type contact as claimed in claim 3, characterized in that: The inner two ends of the petal-shaped static contact finger are provided with inwardly protruding mounting protrusions and contact protrusions, and the arc surface is provided on the contact protrusions.

5. A process for improving the electrical contact performance of a petal-type contact as claimed in claim 3, characterized in that: The mounting holes and the elastic members are provided in plurality.

6. A process for improving the electrical contact performance of a petal-type contact as claimed in claim 5, characterized in that: The elastic member is a compression spring.

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