CN204167227U - A kind of circuit breaker - Google Patents

Abstract

A circuit breaker, comprising a frame (1), a main shaft drive system (2), a vacuum interrupter (3), an oil buffer (4), a spring operating mechanism (6) and a controller module; the vacuum interrupter (3 ) is equipped with a moving contact (31) and a static contact (32); the spring operating mechanism (6) is connected to the moving contact (31) through the main shaft transmission system (2), and the main shaft transmission system (2) includes a The brake arm (21); the top of the oil buffer (4) is matched with the opening arm (21); it is characterized in that it also includes a pressure sensor (5), the pressure sensor (5) is set on the oil The bottom end of the buffer (4), and the bottom surface of the pressure sensor (5) is in contact with the frame (1), and the output signal end of the pressure sensor (5) is connected with the controller module. The utility model realizes the overall monitoring of the opening process of the circuit breaker, which is beneficial to maintenance and maintenance.

Description

a circuit breaker

technical field

The utility model relates to a circuit breaker.

Background technique

At present, low-voltage circuit breakers and civil electrical components all have the functions of various parameter detection, automatic tripping or alarming. Under the background of the intelligent transformation of the national grid, the smart circuit breaker is a controller with functions such as circuit breaker temperature, opening characteristics, opening and closing electromagnet current, and energy storage motor current on the basis of traditional circuit breakers. , realizing intelligent control.

Since the failure of vacuum circuit breakers can easily cause power grid accidents and cause major economic losses, there are two methods of maintenance of vacuum circuit breakers widely used at present: regular maintenance and post-event maintenance. After-event maintenance cannot detect equipment faults and defects early; regular maintenance lacks pertinence, often resulting in a great waste of manpower and material resources, and at the same time, excessive maintenance may also bring new safety hazards.

Contents of the invention

The purpose of the utility model is to provide a circuit breaker to solve the problem in the prior art that it is not convenient to collect the opening parameters of the circuit breaker and supervise the opening process of the circuit breaker.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a circuit breaker, including a frame, a main shaft transmission system, a vacuum interrupter, an oil buffer, a spring operating mechanism and a controller module; the vacuum interrupter is equipped with There are moving contacts and static contacts; the spring operating mechanism is connected to the moving contacts through the main shaft transmission system, and the main shaft transmission system includes an opening arm; the top of the oil buffer is connected to the opening arm. Cooperate to accept the downward action force of the opening arm when the circuit breaker is open; it also includes a pressure sensor, the pressure sensor is arranged at the bottom of the oil buffer, and the bottom surface of the pressure sensor is in contact with the frame, The output signal terminal of the pressure sensor is connected with the controller module.

In the above solution, the main shaft transmission system further includes a first connecting rod and a rotating plate, the opening arm is hinged relative to the frame and connected to the spring operating mechanism, and one end of the opening arm is located at the bottom of the oil buffer. The upper part of the top is matched with the top of the oil buffer, and the other end of the opening arm is connected to one end of the rotating plate through the first connecting rod. The rotating plate is also hinged relative to the frame, and the other end of the rotating plate is connected to the moving contact. connect.

Design principle of the present utility model and the effect that bring are:

The utility model can detect the contact signal between the opening crank arm and the oil buffer by adding a pressure sensor, and record the pressure of the oil buffer on the frame. The pressure signal is transmitted to the controller module in real time, and then the time-force curve of the whole process is drawn, so as to realize the comprehensive monitoring of the circuit breaker opening process, which is conducive to better maintenance and maintenance.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment;

Figure 2 is a schematic diagram of the position of the opening arm relative to the oil buffer during the opening action of the embodiment of the utility model;

Figure 3 is a second schematic diagram of the position of the opening arm relative to the oil buffer during the opening action of the embodiment of the utility model;

Fig. 4 is the third schematic diagram of the position of the opening arm relative to the oil buffer during the opening action of the embodiment of the utility model;

Fig. 5 is a schematic diagram 4 of the position of the opening arm relative to the oil buffer during the opening action of the embodiment of the utility model;

Fig. 6 is a time-force curve of the pressure change of the pressure sensor during the whole opening process of the embodiment of the utility model.

In the above drawings: 1. frame; 2. main shaft drive system; 21. opening arm; 22. first connecting rod; 23. rotating plate; 3. vacuum interrupter; 31. moving contact; 32. static Contact; 4. Oil buffer; 5. Pressure sensor; 6. Spring operating mechanism. the

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Embodiment: see shown in Fig. 1-6:

A circuit breaker includes a frame 1, a main shaft drive system 2, a vacuum interrupter 3, an oil buffer 4, a pressure sensor 5, a spring operating mechanism 6 and a controller module. The vacuum interrupter 3 is provided with a moving contact 31 and a static contact 32; the spring operating mechanism 6 is connected to the moving contact 31 through the main shaft transmission system 2, and the main shaft transmission system 2 includes a switch switch arm 21. The top of the oil buffer 4 cooperates with the opening arm 21, and accepts the downward action force of the opening arm 21 when the circuit breaker is opened. The bottom end, and the bottom surface of the pressure sensor 5 is in contact with the frame 1, and the output signal end of the pressure sensor 5 is connected with the controller module.

Specifically, as shown in FIG. 1 , the main shaft transmission system 2 , the vacuum interrupter 3 , and the spring operating mechanism 6 are installed inside the frame 1 , and the oil buffer 4 is installed at the lower part of the frame 1 . The main shaft transmission system 2 also includes a first connecting rod 22 and a rotating plate 23. The opening arm 21 is hinged relative to the frame 1 and is connected to the spring operating mechanism 6, specifically the connection between the opening arm 21 and the spring operating mechanism 6. The main shaft 61 is connected to each other and is directly driven by the rotation of the main shaft 61 . One end of the opening arm 21 is located above the top of the oil buffer 4 and is matched with the top of the oil buffer 4 , while the other end of the opening arm 21 is connected to one end of the rotating plate 23 via the first connecting rod 22 , the rotating plate 23 is also hinged relative to the frame 1, and the other end of the rotating plate 23 is connected to the moving contact 31 via an insulating pull rod.

The opening process of this embodiment is as follows: when the circuit breaker of this embodiment is in the closing state, the static contact 32 and the moving contact 31 are in contact with each other and conducting, when the circuit breaker receives the opening command, the contact spring force and the spring Under the action of the spring force of the operating mechanism 6, the main shaft 61 rotates counterclockwise, which drives the opening lever 21 to rotate counterclockwise. On the one hand, one end of the opening lever 21 hits the top of the oil buffer 4, and on the other hand, the opening lever The other end of the arm 21 drives the first connecting rod 22 to move upward, and then drives the rotating plate 23 to rotate counterclockwise, and finally drives the moving contact 31 in the vacuum interrupter 3 to move downward through the insulating pull rod connected to the rotating plate 23, and The static contact 32 in the vacuum interrupter 3 is separated to complete the opening action. During this process, the pressure sensor 5 can detect the contact signal between the opening arm 21 and the oil buffer 4, record the pressure of the oil buffer 4 on the frame 1, and start to receive the opening signal until the opening is completed. 4 The signal of the pressure on the frame 1 is transmitted to the controller module in real time, and then the time-force curve of the whole process is drawn, and displayed on the display screen of the controller module, which can monitor the opening process of the circuit breaker.

When the circuit breaker is in the closing state, the position of the opening arm 21 of the circuit breaker is defined as a1, as shown in Figure 2; when the opening arm 21 is just in contact with the oil buffer 4, the position of the opening arm 21 is defined as a, As shown in Figure 3; when the circuit breaker is in the opening state, the position of the opening arm 21 of the circuit breaker is defined as b, as shown in Figure 4; since the spring force generated by the opening spring of the spring operating mechanism 6 is very large when the circuit breaker is open, When the opening lever 21 reaches position b for the first time, it will bounce back, and the highest position where the opening lever 21 rebounds is defined as b1, as shown in FIG. 5 . The opening process is described by the position of the crank arm, which can be divided into the following four processes: a1 to a, a to b, b to b1, b1 to b.

Specifically, as shown in Figure 6, when the circuit breaker is ready to open, such as manually operating the opening button, the controller module receives the opening signal, and the controller module records the time as T; when the circuit breaker is open, the main shaft drives The system 2 moves, the opening arm 21 rotates, and then the opening arm 21 touches the oil buffer 4, that is, the opening arm 21 is located at the position a, and the oil buffer 4 receives the direction of the opening arm 21. The lower action pressure gives the frame 1 a downward pressure, which is detected by the pressure sensor 5 and generates a sudden change signal, which is transmitted to the controller module and recorded as A1 at this moment; when the opening arm 21 continues to rotate downward, due to the oil buffer 4 The existence of the opening arm 21 will give a certain reaction force, so that the pressure of the oil buffer 4 on the frame 1 will gradually decrease and remain unchanged for a period of time until the buffer stroke of the oil buffer 4 reaches the maximum. At this time, the oil buffer 4 no longer acts as a buffer, that is, the opening lever 21 is in the b position, and the spring force of the spring operating mechanism 6 on the opening lever 21 is completely transmitted to the frame 1 through the oil buffer 4. When the pressure sensor 5 detects a sudden change signal, it is transmitted to the controller module, and this moment is recorded as B1; since the opening spring of the spring operating mechanism gives a great force to the opening lever 21, the opening lever 21 reaches position b for the first time. After that, it will rebound upwards for a distance of one end. At this time, the spring force of the spring operating mechanism on the brake arm 21 no longer acts on the oil buffer 4, and the pressure sensor 5 will also detect a sudden change signal until the opening arm 21 rebounds to reach At the highest position, that is, position b1, the opening arm 21 will continue to move downward under the action of the spring force of the spring operating mechanism until it reaches point b again. The brake lever 21 is in the b position again, and the spring force of the spring operating mechanism on the opening lever 21 is completely transmitted to the frame 1 through the oil buffer 4. At this time, the pressure sensor 5 detects a sudden change signal and transmits it to the control The controller module records this moment as B11. In this way, the controller module completely records the pressure changes of the pressure sensor 4 at the specific time of A1, B1, B11 and T, thus obtaining the state of the opening process of the circuit breaker, that is, "T~A1" is called just opening Time, "T~B1" is called the opening time, "B1~B11" is called the bounce time, see Figure 6. This time-force curve of the final output is shown on the display of the controller module.

In this way, this embodiment can realize a comprehensive detection of the current opening process of the circuit breaker. Of course, we must compare each opening data record of the circuit breaker in order to better supervise the circuit breaker and thus play an intelligent role. It can manage the function of product maintenance and repair.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present utility model, and its purpose is to enable those familiar with this technology to understand the content of the present utility model and implement it accordingly, and not to limit the protection scope of the present utility model. All equivalent changes or modifications made according to the spirit of the utility model shall fall within the protection scope of the utility model.

Claims (2)

1. A circuit breaker, including a frame (1), a main shaft drive system (2), a vacuum interrupter (3), an oil buffer (4), a spring operating mechanism (6) and a controller module; the vacuum interrupter The arc chamber (3) is provided with a moving contact (31) and a static contact (32); the spring operating mechanism (6) is connected to the moving contact (31) through the main shaft transmission system (2), and the main shaft The transmission system (2) includes an opening arm (21); the top of the oil buffer (4) cooperates with the opening arm (21), and accepts the opening arm (21) when the circuit breaker opens. ) downward action force; it is characterized in that: it also includes a pressure sensor (5), the pressure sensor (5) is set at the bottom of the oil buffer (4), and the bottom surface of the pressure sensor (5) is in contact with the frame (1) are in contact with each other, and the output signal end of the pressure sensor (5) is connected to the controller module. 2. A circuit breaker according to claim 1, characterized in that: the main shaft transmission system (2) further includes a first connecting rod (22) and a rotating plate (23), and the opening arm (21) Hinged relative to the frame (1) and connected to the spring operating mechanism (6), one end of the trip arm (21) is located above the top of the oil buffer (4) and connected to the top of the oil buffer (4) and the other end of the opening arm (21) is connected to one end of the rotating plate (23) through the first connecting rod (22), and the rotating plate (23) is also hinged relative to the frame (1), and the rotating plate (23) The other end is connected with the moving contact (31).