Closing resistor transmission structure for single-fracture double-acting arc extinguish chamber high-voltage circuit breaker
By designing the auxiliary crank arm and the transformer ratio coordination of the resistor crank arm in the high-voltage circuit breaker, the problem of premature connection of the resistor break in the double-acting arc-extinguishing chamber was solved, and the insulation gap of the resistor break and the closing overvoltage were effectively controlled.
Patent Information
- Application Number
- CN202422045218.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-22
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-08-22
AI Technical Summary
In high-voltage power grid systems, the closing resistor break of a double-acting arc-extinguishing chamber is difficult to connect 8 to 11 ms before the main break is closed, and conventional transmission structures cannot meet the withstand voltage insulation requirements of the resistor break.
The design employs a variable ratio coordination between the auxiliary crank arm and the resistor crank arm, which makes the moving contact of the resistor move faster than the moving contact of the main break. Through the connection of the transmission plate and the auxiliary crank arm, the resistor break is connected and closed before the main break.
This allows the resistor break to be connected in advance before the main break is closed, meeting the insulation gap requirements and effectively limiting the closing overvoltage.
Smart Images
Figure CN223181018U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of closing resistors, and particularly relates to a closing resistor transmission structure for a single-break double-acting arc extinguishing chamber high-voltage circuit breaker. Background Art
[0002] In a high-voltage power grid system, overvoltage will be generated during the closing operation of a circuit breaker. Generally, in a power grid system above 330 kV, in some working conditions, it is necessary for the circuit breaker to be connected in parallel with a closing resistor to limit the closing operation overvoltage. Its working principle is to absorb and convert part of the electric energy in the power grid into heat energy by using the closing resistor, so as to weaken the electromagnetic oscillation and limit the overvoltage purpose.
[0003] Generally, it is required that the closing resistor contact breaks be closed 8 - 11 ms before the main contact breaks close, and the closing resistor is connected in series to the main circuit, so as to convert the overvoltage into the heat energy of the resistor to achieve the suppression of the closing overvoltage. To achieve the closing of the resistor contact breaks ahead of the main contact breaks, generally for a single-acting arc extinguishing chamber, it is achieved by making the resistor opening distance smaller than the main contact break opening distance, and the resistor contact moves at the same speed as the main contact break to achieve the early closing of the resistor contact breaks. For a double-acting arc extinguishing chamber, the main contact break adopts double-acting transmission, and the relative movement speed of its moving and static contacts is generally twice the input speed. Therefore, if the conventional transmission structure is still adopted, the opening distance of the resistor contact needs to be very small to meet the requirement that the resistor contact breaks contact 8 - 11 ms before the main contact breaks, but the too small opening distance no longer meets the withstand voltage and insulation requirements of the resistor contact breaks. Therefore, a new method is urgently needed to achieve the closing of the resistor contact breaks ahead of the main contact breaks. Summary of the Invention
[0004] Aiming at the defects of the prior art, the utility model provides a closing resistor transmission structure for a single-break double-acting arc extinguishing chamber high-voltage circuit breaker. By designing the ratio matching between the auxiliary crank arm and the resistor crank arm, the moving speed of the resistor moving contact is higher than that of the main contact break moving contact, so as to achieve the closing of the resistor contact breaks ahead of the main contact breaks.
[0005] In order to achieve the above purpose, the utility model provides a closing resistor transmission structure for a single-break double-acting arc extinguishing chamber high-voltage circuit breaker, including:
[0006] A transmission connecting plate, one end of which is connected to the main contact break pull rod for controlling the closing operation of the main contact break; the main contact break pull rod is installed on the first horizontal translation limit component and can only move along a certain set direction;
[0007] An auxiliary crank arm, one end of which is connected to the resistor crank arm through a resistor transmission connecting plate; the other end of the resistor crank arm is connected to the resistor moving contact through a resistor insulating plate; the resistor moving contact is installed on the second horizontal translation limit component and can only move along a certain set direction;
[0008] The other ends of the transmission connecting plate and the auxiliary toggle arm are jointly connected to an insulating pull rod, and then connected to a spring operating mechanism through the toggle arm;
[0009] Variable ratio installation interfaces for adjusting the movement speed ratio of the resistance moving contact and the main break moving contact are arranged at intervals on the auxiliary toggle arm and the resistance toggle.
[0010] Furthermore, the first horizontal translation limiting component and the second horizontal translation limiting component are circumferential direction guiding structures with fixed positions, and the main break pull rod or the resistance moving contact passes through them and moves in the horizontal direction.
[0011] Furthermore, the toggle arm includes an outer toggle arm and an inner toggle arm. One end of the outer toggle arm is connected to the output pull rod of the spring operating mechanism, the other end is connected to the inner toggle arm, and the other end of the inner toggle arm is connected to the insulating pull rod.
[0012] Furthermore, the toggle arm is fixed on the toggle arm box. A bearing hole is opened on the toggle arm box, and the transmission shaft is installed on the upper bearing hole. The inner toggle arm and the outer toggle arm are installed on the transmission shaft at a fixed angle through splines.
[0013] Furthermore, the outer toggle arm and the output pull rod of the spring operating mechanism are connected by a pin shaft, and the inner toggle arm is connected to the insulating pull rod by a pin shaft.
[0014] Furthermore, the insulating pull rod is hingedly connected to the transmission connecting plate and the auxiliary toggle arm through a pin shaft.
[0015] Furthermore, the transmission connecting plate and the main break pull rod are hingedly connected by a pin shaft.
[0016] Furthermore, both ends of the resistance transmission connecting plate are respectively hingedly connected to the auxiliary toggle arm and the resistance toggle arm through pin shafts.
[0017] Furthermore, both ends of the resistance insulating plate are respectively hingedly connected to the resistance toggle arm and the resistance moving contact through pin shafts.
[0018] Advantages of the present utility model:
[0019] Through the variable ratio cooperation design between the auxiliary toggle arm and the resistance toggle arm, the movement speed of the resistance moving contact is higher than that of the main break moving contact, so as to realize that the resistance break is closed and switched on before the main break, and at the same time, the opening distance of the resistance break is not excessively smaller than the required insulation opening distance. Description of the Drawings
[0020] Figure 1 It is a schematic diagram of the closing resistance transmission structure of the single-break double-moving arc extinguishing chamber high-voltage circuit breaker in the embodiment of the present utility model.
[0021] Wherein: 1. Spring operating mechanism; 2. Rocker arm box; 3. Rocker arm; 4. Insulating pull rod; 5. Transmission link plate; 6. Main break contact pull rod; 7. Auxiliary rocker arm; 8. Resistance transmission link plate; 9. Resistance rocker arm; 10. Resistance insulating plate; 11. Resistance moving contact. Detailed implementation mode
[0022] The present utility model will be further explained below in conjunction with the accompanying drawings and embodiments.
[0023] As Figure 1 shown, the embodiment of the present utility model provides a closing resistance transmission structure for a single-break double-moving arc-extinguishing chamber high-voltage circuit breaker, including: a spring operating mechanism 1, a rocker arm box 2, a rocker arm 3, an insulating pull rod 4, a transmission link plate 5, a main break contact pull rod 6, an auxiliary rocker arm 7, a resistance transmission link plate 8, a resistance rocker arm 9, a resistance insulating plate 10, and a resistance moving contact 11.
[0024] The spring operating mechanism 1 is connected to the circuit breaker through the rocker arm box 2.
[0025] The rocker arm 3 is fixed on the rocker arm box 2. A bearing hole is provided on the rocker arm box 2, and the transmission shaft is installed on the bearing hole. The rocker arm 3 includes an outer rocker arm and an inner rocker arm. The inner rocker arm and the outer rocker arm are installed at a fixed angle with the transmission shaft through splines. The other end of the outer rocker arm is connected to the output pull rod of the spring operating mechanism 1 through a pin shaft, and the other end of the inner rocker arm is connected to the insulating pull rod 4 through a pin shaft.
[0026] The insulating pull rod 4 is hinged to both the transmission link plate 5 and the auxiliary rocker arm 7 through pin shafts.
[0027] The other end of the transmission link plate 5 is connected to the main break contact pull rod 6 through a pin shaft for controlling the closing operation of the main break contact; the main break contact pull rod 6 is installed on the first horizontal translation limiting component and can only move in the horizontal direction.
[0028] The other end of the auxiliary rocker arm 7 is connected to the resistance rocker arm 9 through the resistance transmission link plate 8. The other end of the resistance rocker arm 9 is connected to the resistance moving contact 11 through the resistance insulating plate 10. The resistance moving contact 11 is installed on the second horizontal translation limiting component and can only move in the horizontal direction. The auxiliary rocker arm 7, the resistance transmission link plate 8, the resistance rocker arm 9, the resistance insulating plate 10, and the resistance moving contact 11 are all connected through pin shafts to realize the closing of the resistance break contact.
[0029] Both the first horizontal translation limiting component and the second horizontal translation limiting component are circumferential direction guiding structures with fixed positions, such as guiding rings. The main break contact pull rod 6 or the resistance moving contact 11 passes through them to limit their movement in the horizontal direction.
[0030] Variable ratio mounting interfaces for adjusting the movement speed ratio between the resistor moving contact and the main break moving contact are provided at intervals on the auxiliary link arm 7 and the resistor link arm 9. Through the variable ratio mounting interfaces, the linear movement speed of the resistor moving contact 11 can be designed to be more than twice that of the main break pull rod 6, thus meeting the requirement that the resistor break closes before the main break.
[0031] The working principle of this closing resistor drive structure is as follows:
[0032] During the closing operation, the outer link arm of the link arm 3 driven by the spring operating mechanism 1 rotates to the right, driving the insulating pull rod 4 to move horizontally. The insulating pull rod 4 drives the main break pull rod 6 to move forward for closing through the connecting plate 5. At the same time, the insulating pull rod 4 also drives the auxiliary link arm 7 to rotate to the right. The auxiliary link arm 7 drives the resistor link arm 9 to swing to the right through the resistor drive connecting plate 8. The resistor link arm 9 drives the resistor moving contact 11 to move to the right through the resistor insulating plate 10 to realize the closing of the resistor break. Through the transmission ratio design of the auxiliary link arm 7 and the resistor link arm 9, the linear movement speed of the resistor moving contact 11 is more than twice that of the main break pull rod 6, thus meeting the requirement that the resistor break closes before the main break.
[0033] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field based on the concept of the present invention through logical analysis, reasoning, or limited experiments on the basis of the prior art should fall within the protection scope determined by the claims.
Claims
1. A closing resistor drive structure for a single-break double-acting arc extinguishing chamber high-voltage circuit breaker, characterized in that, Including: A transmission connecting plate (5), one end of which is connected to the main disconnector pull rod (6) for controlling the closing operation of the main disconnector; the main disconnector pull rod (6) is installed on the first horizontal translation limiting component and can only move along a certain set direction; An auxiliary toggle arm (7), one end of which is connected to a resistance toggle arm (9) through a resistance transmission connecting plate (8); the other end of the resistance toggle arm (9) is connected to a resistance moving contact (11) through a resistance insulating plate (10); the resistance moving contact (11) is installed on the second horizontal translation limiting component and can only move along a certain set direction; The other ends of the transmission connecting plate (5) and the auxiliary toggle arm (7) are commonly connected to an insulating pull rod (4), and then connected to a spring operating mechanism (1) through a toggle arm (3); Variable ratio installation interfaces for adjusting the movement speed ratio between the resistance moving contact and the main disconnector moving contact are arranged at intervals on the auxiliary toggle arm (7) and the resistance toggle arm (9).
2. The closing resistor drive structure for a single-break double-acting arc-extinguishing chamber high-voltage circuit breaker according to claim 1, characterized in that: The first horizontal translation limiting component and the second horizontal translation limiting component are circumferential direction guiding structures with fixed positions, and the main disconnector pull rod (6) or the resistance moving contact (11) passes through them and can only move horizontally.
3. The closing resistor drive structure for a single-break double-acting arc-extinguishing chamber high-voltage circuit breaker according to claim 1, characterized in that: The toggle arm (3) includes an outer toggle arm and an inner toggle arm. One end of the outer toggle arm is connected to the output pull rod of the spring operating mechanism (1), and the other end is connected to the inner toggle arm. The other end of the inner toggle arm is connected to the insulating pull rod (4).
4. The closing resistor drive structure for a single-break double-acting arc-extinguishing chamber high-voltage circuit breaker according to claim 3, characterized in that: The toggle arm (3) is fixed on a toggle arm box (2). A bearing hole is opened on the toggle arm box (2), and a transmission shaft is installed on the bearing hole. The inner toggle arm and the outer toggle arm are installed on the transmission shaft at a fixed angle through splines.
5. The closing resistor drive structure for a single-break double-acting arc-extinguishing chamber high-voltage circuit breaker according to claim 3, characterized in that: The outer toggle arm and the output pull rod of the spring operating mechanism (1) are connected through a pin shaft, and the inner toggle arm is connected to the insulating pull rod (4) through a pin shaft.
6. The closing resistor drive structure for a single-break double-acting arc-extinguishing chamber high-voltage circuit breaker according to claim 1, characterized in that: The insulating pull rod (4) is hinge-connected to the transmission connecting plate (5) and the auxiliary toggle arm (7) through a pin shaft.
7. The closing resistor drive structure for a single-break double-acting arc extinguishing chamber high-voltage circuit breaker according to claim 1, characterized in that: The transmission connecting plate (5) is connected to the main disconnector pull rod (6) through a pin shaft.
8. The closing resistor drive structure for a single-break double-acting arc-extinguishing chamber high-voltage circuit breaker according to claim 1, characterized in that: Both ends of the resistance transmission connecting plate (8) are hinge-connected to the auxiliary toggle arm (7) and the resistance toggle arm (9) through a pin shaft respectively.
9. The closing resistor drive structure for a single-break double-acting arc-extinguishing chamber high-voltage circuit breaker according to claim 1, characterized in that: Both ends of the resistance insulating plate (10) are hinge-connected to the resistance toggle arm (9) and the resistance moving contact (11) through a pin shaft respectively.