An adaptive fast-disconnect contact device

Abstract

This invention discloses an adaptive fast-opening contact device, relating to the field of high-voltage switchgear technology. It includes a moving contact base, a moving contact assembly, a stationary contact assembly, and a spring contact finger. This invention can be used in gas-insulated metal-enclosed switchgear, including disconnecting switches, grounding switches, circuit breakers, and other switchgear. The device achieves high-speed opening between contacts through the moving contact assembly structure design; it corrects contact alignment deviations and ensures reliable contact through the stationary contact assembly structure design; and it connects the moving and stationary contact assemblies via the spring contact finger to carry the rated current.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switchgear technology, particularly to gas-insulated metal-enclosed switchgear. Background Technology

[0002] Gas-insulated metal-enclosed switchgear is an important electrical device in power systems. Disconnecting switches, grounding switches, and circuit breakers are the current-switching components in gas-insulated metal-enclosed switchgear. The contact structure of different components determines whether the switchgear can carry the normal operating current of the power grid and whether it can effectively switch the power grid operating current and fault current.

[0003] Existing contact devices generally adopt clamping or pressing contact structure, with the arc contact moving synchronously with the main contact and there is no speed difference. The overall contact opening speed is relatively slow, and the ability to interrupt grid operating current and fault current is relatively weak. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides an adaptive fast-opening contact device. Through a reasonable structural design, the moving main contact opens first during contact opening, while the moving arc contact opens quickly with a lag, thereby achieving the ability to carry the normal operating current of the power grid, as well as effectively open and close the power grid operating current and fault current.

[0005] To solve the above-mentioned technical problems, the specific technical solution of the present invention is as follows: An adaptive fast-release contact device, comprising a moving contact seat, a moving contact assembly, and a stationary contact assembly; both the inner wall of the moving contact seat and the inner wall of the stationary contact assembly are provided with spring contact fingers, and the moving contact seat and the stationary contact assembly are positioned correspondingly; a stationary arc contact is provided inside the stationary contact assembly; the moving contact assembly is disposed inside the moving contact seat and can extend and retract along the axis of the moving contact seat; a moving arc contact is provided inside the moving contact assembly, and the moving arc contact can extend and retract along the axis of the moving main contact.

[0006] The moving contact assembly includes a moving main contact. The outer wall of the moving main contact contacts the inner wall of the moving contact seat. The moving main contact has a stepped cavity with wide ends and narrow middle along the axial direction. The moving arc contact is located in the wide cavity on one side near the stationary contact assembly. The rear end of the moving arc contact is connected to a connecting rod. The connecting rod passes through the narrow cavity and the rear part of the connecting rod is located in the wide cavity on the other side. A spring I is provided at the rear part of the connecting rod, and a locking plate is provided at the rear end of the connecting rod. The spring I is installed outside the connecting rod and is pre-compressed and locked by the locking plate.

[0007] The moving main contact has a coarse cavity near the contact assembly side, with a retaining sleeve on the inner wall of the front end of the coarse cavity and a contact finger on the inner wall of the rear end of the coarse cavity.

[0008] The diameter of the top of the moving arc contact is larger than the middle diameter, and the diameter of the rear end is larger than the top diameter.

[0009] The stationary contact assembly includes a stationary contact base and a stationary arc contact. The stationary arc contact is electrically connected to the stationary contact base via a contact finger. The stationary arc contact is fitted with a retaining ring, which is installed on the stationary contact base by screws. Spring II is installed between the stationary contact base and the stationary arc contact, and the stationary arc contact corresponds to the moving arc contact.

[0010] The stationary contact seat retaining ring and the stationary arc contact are provided with a gap, so that the stationary arc contact can rotate and tilt appropriately to correct the centering error.

[0011] The end of the stationary arc contact near the moving arc contact has a tapered cylindrical structure with a reduced inner diameter.

[0012] The beneficial effects of this invention are: through the coordination of the moving contact seat, moving contact assembly, stationary contact assembly and internal structure, this invention enables the moving main contact to open first and the moving arc contact to open quickly and lagging behind when the contacts are opened, thereby achieving the ability to carry the normal operating current of the power grid, as well as the ability to effectively open and close the operating current and fault current of the power grid. Attached Figure Description

[0013] Figure 1 This is the overall structure diagram;

[0014] Figure 2 This is a structural diagram of the moving contact assembly.

[0015] Figure 3 This is a structural diagram of the stationary contact assembly.

[0016] Figure 4 This is a schematic diagram of the operating process.

[0017] In the diagram: 1-moving contact seat, 2-moving contact assembly, 3-stationary contact assembly, 4-spring contact finger, 5-moving main contact, 6-moving arc contact, 7-connecting rod, 8-spring I, 9-locking plate, 10-stop sleeve, 11-stationary contact seat, 12-stationary arc contact, 13-contact finger, 14-stop ring, 15-screw, 16-spring II. Detailed Implementation

[0018] like Figure 1-2 As shown, an adaptive fast-opening contact device includes a moving contact seat 1, a moving contact assembly 2, and a stationary contact assembly 3. Spring-loaded contact fingers 4 are provided on the inner walls of both the moving contact seat 1 and the stationary contact assembly 3. These spring-loaded contact fingers 4 are used to carry the grid operating current in the closed state. The moving contact seat 1 and the stationary contact assembly 3 are positioned correspondingly. A stationary arc contact 12 is provided within the stationary contact assembly 3. The moving contact assembly 2 is disposed within the moving contact seat 1 and can extend and retract along the axis of the moving contact seat 1. The moving contact assembly 2 can be operated using an external power source, moving between the moving contact seat 1 and the stationary contact assembly 3 to complete the opening and closing operations.

[0019] like Figure 2The moving contact assembly 2 shown includes a moving main contact 5. The outer wall of the moving main contact 5 contacts the inner wall of the moving contact seat 1. The moving main contact 5 has a stepped cavity with wider ends and a narrower middle section along its axial direction. In the wider cavity near the contact assembly 3, a retaining sleeve 10 is provided on the inner wall of the front end of the wider cavity, and a contact finger 13 is provided on the inner wall of the rear end of the wider cavity. The moving arc contact 6 is electrically connected to the moving main contact 5 via the contact finger 13. The retaining sleeve 10 limits the pull-out length of the moving arc contact 6. The moving arc contact 6 is located in the wider cavity near the stationary contact assembly 3. The diameter of the top end of the moving arc contact 6 is larger than the middle diameter, and the diameter of the rear end is larger than the top end diameter. The rear end of the moving arc contact 6 is connected to a connecting rod 7, which passes through the narrow cavity. The rear part of the connecting rod 7 is located in the wider cavity on the other side. A spring 18 is provided at the rear end of the connecting rod 7, and a locking piece 9 is provided at the rear end of the connecting rod 7. Spring I8 is installed outside the connecting rod 7. After pre-compression, it is locked with locking plate 9 to ensure that the moving arc contact 6 of the trip assembly is completely retracted into the moving main contact 5.

[0020] like Figure 3 The stationary contact assembly 3 shown includes a stationary contact base 11 and a stationary arc contact 12. The stationary arc contact 12 is electrically connected to the stationary contact base 11 via a contact finger 13. A retaining ring 14 is fitted over the stationary arc contact 12 and is mounted on the stationary contact base 11 by screws 15. A spring II 16 is installed between the stationary contact base 11 and the stationary arc contact 12, allowing the stationary arc contact to move to contact the retaining ring 14 under normal conditions. The stationary arc contact 12 corresponds to the moving arc contact 6. The end of the stationary arc contact 12 near the moving arc contact 6 has a tapered cylindrical structure with a reduced inner diameter. A gap is provided between the retaining ring 14 of the stationary contact base 11 and the stationary arc contact 12, allowing the stationary arc contact 12 to rotate and tilt appropriately, correcting alignment errors and achieving an adaptive function.

[0021] The operating principle is as follows Figure 4 As shown.

[0022] The tripping process is as follows:

[0023] When the device is in the closed position, the moving contact assembly 2 is inserted into the stationary contact assembly 3 and is electrically connected to the moving contact seat 1 and the stationary contact seat 11 through the spring contact finger 4.

[0024] After the circuit breaker starts to open, the moving contact assembly 2 gradually moves to the right under the action of an external power source. When it moves to Figure b, the moving contact assembly 2 disengages from the spring contact finger 4 on the stationary contact assembly 3, while the moving arc contact 6 contacts the stationary arc contact 12.

[0025] As the circuit continues to move, the moving arc contact 6 is held tightly by the stationary arc contact 12 and remains stationary, while the moving main contact 5 continues to move to the right. When it reaches the position shown in Figure c, the moving arc contact 6 collides with the retaining sleeve 10, and the moving arc contact 6 separates from the stationary arc contact 12. Under the action of the spring I8, it quickly retracts into the moving main contact 8, completing the rapid tripping.

[0026] Finally, it moves to the trip position shown in Figure d, completing the tripping operation.

[0027] The closing process is as follows:

[0028] d represents the open position of the device. After the closing operation begins, the moving contact assembly 2 gradually moves to the left under the action of an external power source. During the movement, the moving arc contact 6 is always retracted into the moving main contact 5 under the action of spring I8, and moves to the left along with the moving main contact 5. When the moving arc contact 6 contacts the stationary arc contact 12, it is squeezed by the moving main contact 5 and pressed into the stationary arc contact 12. The moving contact assembly 2 finally moves to the closing position shown in Figure a, completing the closing operation.

Claims

1. An adaptive fast-disconnect contact device, characterized in that: It includes a moving contact seat (1), a moving contact assembly (2), and a stationary contact assembly (3); the inner walls of the moving contact seat (1) and the stationary contact assembly (3) are both provided with spring contact fingers (4), and the moving contact seat (1) and the stationary contact assembly (3) are in corresponding positions; the stationary contact assembly (3) is provided with a stationary arc contact (12); the moving contact assembly (2) is set in the moving contact seat (1) and can move telescopically along the axis of the moving contact seat (1); the moving contact assembly (2) is provided with a moving arc contact (6), and the moving arc contact (6) can move telescopically along the axis of the moving main contact (5); The moving contact assembly (2) includes a moving main contact (5). The outer wall of the moving main contact (5) contacts the inner wall of the moving contact seat (1) through a spring contact finger (4). The moving main contact (5) has a stepped cavity with wide ends and narrow middle along the axial direction. The moving arc contact (6) is located in the wide cavity on one side near the stationary contact assembly (3). The rear end of the moving arc contact (6) is connected to a connecting rod (7). The connecting rod (7) passes through the narrow cavity. The rear part of the connecting rod (7) is located in the wide cavity on the other side. The rear part of the connecting rod (7) is provided with a spring I (8). The rear end of the connecting rod (7) is provided with a locking piece (9).

2. The adaptive fast-disconnect contact device according to claim 1, characterized in that: The moving main contact (5) is located in the coarse cavity on the side near the contact assembly (3). The inner wall of the front end of the coarse cavity is provided with a retaining sleeve (10), and the inner wall of the rear end of the coarse cavity is provided with a contact finger (13).

3. The adaptive fast-disconnect contact device according to claim 2, characterized in that: The diameter of the top end of the moving arc contact (6) is greater than the diameter of the middle end, and the diameter of the rear end is greater than the diameter of the top end.

4. The adaptive fast-disconnect contact device according to claim 1, characterized in that: The stationary contact assembly (3) includes a stationary contact seat (11) and a stationary arc contact (12). The stationary arc contact (12) is electrically connected to the stationary contact seat (11) via a contact finger (13). The stationary arc contact (12) is fitted with a retaining ring (14), which is installed on the stationary contact seat (11) by a screw (15). A spring II (16) is installed between the stationary contact seat (11) and the stationary arc contact (12). The stationary arc contact (12) corresponds to the moving arc contact (6).

5. The adaptive fast-disconnect contact device according to claim 4, characterized in that: The stationary contact seat (11) has a gap between the retaining ring (14) and the stationary arc contact (12) so that the stationary arc contact (12) can rotate and tilt appropriately to correct the centering error.

6. The adaptive fast-disconnect contact device according to claim 4, characterized in that: The end of the stationary arc contact (12) near the moving arc contact (6) is a tapered cylindrical structure with a reduced inner diameter.

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