A gradient slotted bounce suppression circuit breaker arc contact structure and a design method thereof
By designing a circuit breaker arc contact with a gradient slot structure, the bounce problem of arc contacts in existing technologies has been solved, achieving higher equipment safety and power grid stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANGHAI XIDIAN HIGH VOLTAGE SWITCHGEAR CO LTD
- Filing Date
- 2025-08-12
- Publication Date
- 2026-07-31
AI Technical Summary
The long-slit structure design of the arc contacts in existing SF6 circuit breakers leads to serious opening and closing bounce problems, affecting equipment safety and power grid operation.
A circuit breaker arc contact with a gradient slot structure is designed, including short slots, medium slots, and long slots. By staggering the distribution and using slots of different lengths, the stiffness and buffering performance of the contact are optimized, and bounce is reduced.
It effectively suppresses the opening and closing bounce of the arc contacts, reduces contact burn-out and system overvoltage risk, and improves the safety and stability of equipment operation.
Smart Images
Figure CN120767171B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of circuit breaker technology, specifically to a circuit breaker arc contact structure and its design method that uses gradient slotting to suppress bounce. Background Technology
[0002] Generally, the arc contacts of SF6 circuit breakers are designed with a long slot structure of equal length. When the circuit breaker is closing or opening, there will be a serious problem of contact bounce between the arc contacts (average bounce time > 6ms). The bounce of the contacts will accelerate contact burn-out, cause system overvoltage, etc., which will seriously affect the operation safety of switchgear and power grid. Summary of the Invention
[0003] To overcome the shortcomings of the prior art, this invention provides a circuit breaker arc contact structure and its design method for suppressing bounce by gradient slotting. The invention redesigns the arc contact slotting structure and quantity, effectively suppressing the opening and closing bounce problem between arc contacts.
[0004] To achieve the above objectives, a circuit breaker arc contact structure with gradient slots to suppress bounce is designed, including a circuit breaker arc contact, characterized in that: a plurality of slots are longitudinally arranged on the circuit breaker arc contact, the plurality of slots including short slots, middle slots and long slots, wherein there are 2 long slots, 4 middle slots and 6 short slots, and the long slots, middle slots and short slots are staggered.
[0005] The top of the circuit breaker arc contact is an arc-shaped cylindrical structure, and the bottom outer edge of the circuit breaker arc contact is provided with external threads.
[0006] The length of the long seam is 80±2mm, the length of the middle seam is 60±2mm, and the length of the short seam is 50±2mm.
[0007] A design method for a circuit breaker arc contact structure that suppresses bounce through gradient slotting is presented below: (1) With the center of the arc contact of the circuit breaker as the center, open a long slit at the 3 o'clock and 9 o'clock positions respectively; (2) With the center of the arc contact of the circuit breaker as the center, open a central seam at each of the 1, 5, 7 and 11 o'clock positions; (3) Short seams are made between the long seam and the middle seam, and between two adjacent middle seams.
[0008] There are a total of 12 seams, including long seams, medium seams, and short seams.
[0009] Short seams account for ≥50%, and long seams account for ≤20%.
[0010] Compared with the prior art, the present invention provides a circuit breaker arc contact structure and its design method for suppressing bounce by gradient slotting. The invention redesigns the arc contact slotting structure and quantity, effectively suppressing the opening and closing bounce problem between arc contacts. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the structure of the present invention.
[0012] Figure 2 , Figure 3 This data represents the closing and opening test data for traditional equidistant long-slit arc contacts.
[0013] Figure 4 , Figure 5 These are the test data for the closing and opening of the arc contact of this invention.
[0014] See Figure 1 1 is the arc contact of the circuit breaker, 2 is the long joint, 3 is the middle joint, and 4 is the short joint. Detailed Implementation
[0015] The present invention will now be further described with reference to the accompanying drawings.
[0016] like Figure 1 As shown, several slots are longitudinally arranged on the arc contact 1 of the circuit breaker. The slots include short slots, medium slots and long slots. There are 2 long slots 2, 4 medium slots 3 and 6 short slots 4. The long slots 2, medium slots 3 and short slots 4 are distributed alternately.
[0017] The top of the circuit breaker arc contact 1 is an arc-shaped cylindrical structure, and the bottom outer edge of the circuit breaker arc contact 1 is provided with external threads.
[0018] The length of the long seam 2 is 80±2mm, the length of the middle seam 3 is 60±2mm, and the length of the short seam 4 is 50±2mm.
[0019] A design method for the arc contact of a circuit breaker with a gradient slotted structure is described below: (1) With the center of the arc contact of the circuit breaker as the center, open a long slit at the 3 o'clock and 9 o'clock positions respectively; (2) With the center of the arc contact of the circuit breaker as the center, open a central seam at each of the 1, 5, 7 and 11 o'clock positions; (3) Short seams are made between the long seam and the middle seam, and between two adjacent middle seams.
[0020] There are a total of 12 seams, including long seams, medium seams, and short seams.
[0021] Short seams account for ≥50%, and long seams account for ≤20%.
[0022] In the circuit breaker arc contact of the present invention, the optimal design is as follows: Six short slots 4, accounting for 50%, provide stiffness support for the circuit breaker arc contact (short slot contact piece: high stiffness, high-frequency vibration); four medium slots 3, accounting for 33.3%, provide stiffness and buffer balance for the circuit breaker arc contact (medium slot contact piece: moderate stiffness, medium-frequency vibration); and two long slots 2, accounting for 16.7.3%, provide absorption of initial collision energy for the circuit breaker arc contact (long slot contact piece: lower stiffness, low-frequency vibration). Experiments were conducted according to the optimal design, and the experimental data are shown in Table 1.
[0023] Table 1 closing bounce time 8.6 ms 0.5 ms 94.2%↓ Number of closing bounces 20 times 1 time 95.0%↓ Tripping time 5.3 ms 0 ms 100%↓ Number of tripping trips 10 times 0 times 100%↓ In Table 1, the contact bounce time, bounce count, and tripping bounce time are measured using a switch mechanical characteristic measuring instrument. Figure 2 , Figure 3 The figure shows the closing test data for a traditional equidistant long-slotted arc contact; as shown... Figure 4 , Figure 5 This is the closing test data for the arc contact of the present invention.
[0024] In the circuit breaker arc contact of the present invention, there are up to 12 slots, providing more possibilities for slots of different lengths. At the same time, the narrowing of the single contact can reduce the rigidity of the single contact and reduce the possibility of bounce. The long slot, middle slot, and short slot contacts are combined because the three different lengths of single contacts have three inherent frequencies, and the frequency of bounce when the contacts come into contact is also different. When bouncing, they rise and fall (when the long slot contact bounces open, the middle slot or short slot contact comes into contact), which can reduce the total bounce time.
Claims
1. A circuit breaker arc contact structure for suppressing bounce by gradient slotting, comprising a circuit breaker arc contact, characterized in that: Several slots are longitudinally arranged on the arc contact (1) of the circuit breaker. The slots include short slots, middle slots and long slots. There are 2 long slots (2), 4 middle slots (3) and 6 short slots (4). The long slots (2), middle slots (3) and short slots (4) are staggered. That is, with the center of the arc contact of the circuit breaker as the center, there is a long slot at the 3 o'clock and 9 o'clock positions. With the center of the arc contact of the circuit breaker as the center, there is a middle slot at the 1 o'clock, 5 o'clock, 7 o'clock and 11 o'clock positions. Short slots are opened between the long slots and middle slots and between two adjacent middle slots.
2. A graded-slit bounce-preventing circuit breaker arc contact structure according to claim 1, characterized in that: The top of the circuit breaker arc contact (1) is an arc-shaped cylindrical structure, and the bottom outer edge of the circuit breaker arc contact (1) is provided with external threads.
3. A graded-slit bounce-preventing circuit breaker arc contact structure according to claim 1, characterized in that: The length of the long seam (2) is 80±2mm, the length of the middle seam (3) is 60±2mm, and the length of the short seam (4) is 50±2mm.
4. A design method for a circuit breaker arc contact structure with gradient slot opening to suppress bounce, characterized in that, The specific design method is as follows: (1) With the center of the arc contact of the circuit breaker as the center, open a long slit at the 3 o'clock and 9 o'clock positions respectively; (2) With the center of the arc contact of the circuit breaker as the center, open a middle seam at each of the 1, 5, 7 and 11 o'clock positions; (3) Short seams are made between the long seam and the middle seam, and between two adjacent middle seams.
5. The method of designing a graded-slit bounce-preventing circuit breaker arc contact structure of claim 4, wherein: There are a total of 12 seams, including long seams, medium seams, and short seams.
6. The method of designing a graded-slit bounce-preventing circuit breaker arc contact structure of claim 4, wherein: Of all the seams, short seams account for ≥50% and long seams account for ≤20%.