Circuit breaker stroke curve test system and method

Abstract

The invention discloses a circuit breaker stroke curve test system and method, the test system comprises a stable light source, an emission collimator, a circuit breaker moving part, a receiving collimator, an optical power acquisition loop and a processing unit, the output of the stable light source is connected to the tail part of the emission collimator through an optical fiber, the emission collimator and the receiving collimator are oppositely arranged, and the optical power acquisition loop is connected with the processing unit. A gap for movement of a moving part of the circuit breaker is reserved between the transmitting collimator and the receiving collimator; the tail part of the receiving collimator is connected to an optical power acquisition loop through an optical fiber; and the optical power acquisition loop transmits data to a processing unit. According to the test system and method, the online test of the state of the circuit breaker can be realized. The sensor is not mechanically or electrically connected with a circuit breaker operating mechanism, and has the advantages of high sampling rate, strong anti-interference capability, small installation size and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of intelligent primary equipment of power system, and in particular relates to a circuit breaker travel curve testing system and method. Background Art

[0002] With the development of power system automation and big data Internet, smart interconnected power grids have received more and more attention. The demand for efficient power grid equipment operation and maintenance is increasing day by day, and the remote status online monitoring applications of various power equipment are emerging in an endless stream. As the key core equipment to ensure the reliable and stable operation of the power grid, the circuit breaker has a huge market stock and dynamic characteristics, which puts higher requirements on the online monitoring of its status. Among the various status parameters of the circuit breaker, the opening and closing stroke and speed are the key indicators for judging the health status of the circuit breaker.

[0003] Existing test systems and methods mostly use offline methods. The test instruments are large, the wiring is complicated, the sensors are large, and they do not have the conditions for long-term online operation. Some online monitoring methods have also been proposed in related literature. Sensors mostly use contact mechanical conduction, which bears the impact of opening and closing during the opening and closing process, and the reliability is insufficient; the sensors are large and difficult to install. In addition, there is a certain delay in mechanical movement and the signal sampling rate is not high, resulting in a large deviation between the measured stroke and the actual movement characteristics. Therefore, the existing circuit breaker stroke curve test system has certain technical bottlenecks. Summary of the invention

[0004] The purpose of the present invention is to provide a circuit breaker travel curve test system and method, which can realize the online test of the circuit breaker state. The sensor has no mechanical or electrical connection with the circuit breaker operating mechanism, and has the advantages of high sampling rate, strong anti-interference ability, and small installation volume.

[0005] In order to achieve the above object, the solution of the present invention is:

[0006] A circuit breaker travel curve test system comprises a stable light source, a transmitting collimator, a circuit breaker moving part, a receiving collimator, an optical power collection circuit and a processing unit, wherein the output of the stable light source is connected to the tail of the transmitting collimator via an optical fiber, the transmitting collimator and the receiving collimator are arranged opposite to each other, and a gap is left between the transmitting collimator and the receiving collimator for the movement of the circuit breaker moving part; the tail of the receiving collimator is connected to the optical power collection circuit via an optical fiber, and the optical power collection circuit transmits data to the processing unit.

[0007] The above-mentioned stable light source is a laser or LED light source.

[0008] The emission collimator outputs a fixed-shape light spot with uniform optical power distribution, and the size of the light spot in the direction parallel to the movement of the moving part of the circuit breaker is not less than the maximum stroke of the circuit breaker;

[0009] The mirror size of the receiving collimator is not smaller than the light spot size.

[0010] The above-mentioned circuit breaker moving part is a light shielding body, which passes through the gap between the transmitting collimator and the receiving collimator during the circuit breaker opening and closing process, and blocks light spots of different areas according to different movement strokes. There is a linear relationship between the area of ​​the blocked light spot and the movement stroke.

[0011] The optical power collection circuit converts the received optical power into an electrical quantity with a linear relationship and transmits it to the processing unit.

[0012] The processing unit stores and processes the optical power data collected by the optical power collection circuit, and outputs the circuit breaker movement data.

[0013] The test method of a circuit breaker travel curve test system as described above comprises the following steps:

[0014] Step 1, a stable light source continuously outputs a light beam with stable optical power, and the light beam is transmitted from a transmitting collimator to a receiving collimator;

[0015] Step 2: The receiving collimator connects the received light beam to the optical power collection circuit through the optical fiber. The optical power collection circuit converts the received optical power into an electrical quantity with a linear relationship and transmits it to the processing unit. After processing, the processing unit outputs the circuit breaker opening and closing position status and the circuit breaker movement data including the opening and closing movement stroke, speed, and acceleration.

[0016] In the above step 2, the processing unit outputs the open and closed position status of the circuit breaker, including judging the open and closed position status according to the size of the optical power, when the optical power is greater than the maximum value of the fixed threshold, judging that the circuit breaker is in the open position state; when the optical power is less than the minimum value of the fixed threshold, judging that the circuit breaker is in the closed position state; or judging the open and closed position status according to the size of the optical power, when the optical power is greater than the maximum value of the fixed threshold, judging that the circuit breaker is in the closed position state; when the optical power is less than the minimum value of the fixed threshold, judging that the circuit breaker is in the open position state.

[0017] In the above step 2, the processing unit outputs the circuit breaker motion data including the opening and closing motion stroke, speed, and acceleration, including that the processing unit converts the optical power data into analog quantity and outputs the motion stroke, speed, and acceleration according to a set linear proportional relationship.

[0018] After adopting the above scheme, the test system provided by the present invention can judge the open and closed states of the circuit breaker according to the collected optical power signals of different amplitudes when the circuit breaker is in the open or closed position. At the same time, during the opening or closing movement, the opening and closing stroke curve data of the circuit breaker is obtained according to the collected optical power amplitude, and high-order data such as speed and acceleration are further obtained through the processing unit. The circuit breaker stroke curve test method and system have no mechanical or electrical connection with the circuit breaker operating mechanism, have the advantages of high sampling rate, strong anti-interference ability, small installation volume, etc., and can realize online testing of the circuit breaker state. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A circuit breaker travel curve testing system according to an embodiment of the present application is shown.

[0020] Figure 2 Another embodiment of the present application shows a circuit breaker travel curve testing method.

[0021] Figure 3 A cross-sectional view of a light spot according to another embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] The following is an explanation of the implementation method of the "circuit breaker travel curve testing system and method" disclosed in the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted according to actual dimensions. It is stated in advance. The following implementation methods will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention.

[0023] It should be understood that the terms "first", "second", "third", etc. in the claims, specifications and drawings of the present invention are used to distinguish different objects rather than to describe a specific order. The terms "include" and "comprise" used in the specification and claims of the present invention indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0024] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the claims, the singular forms of "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be further understood that the term "and / or" used in the specification of the present invention and the claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0025] An embodiment of the present invention provides a circuit breaker travel curve testing system, such as Figure 1 As shown, it includes a stable light source, a transmitting collimator, a circuit breaker moving part, a receiving collimator, an optical power collection circuit and a processing unit, wherein the output of the stable light source is connected to the tail of the transmitting collimator via an optical fiber, the transmitting collimator and the receiving collimator are arranged opposite to each other, and a gap is left between the transmitting collimator and the receiving collimator for the movement of the circuit breaker moving part; the tail of the receiving collimator is connected to the optical power collection circuit via an optical fiber, and the optical power collection circuit transmits data to the processing unit.

[0026] During operation, the light beam emitted by the stable light source is connected to the transmitting collimator through the optical fiber, and the transmitting collimator transmits the approximately parallel light beam to the receiving collimator. The light beam reaches the receiving collimator through the gap. When the circuit breaker opens and closes, the moving parts of the circuit breaker move up and down through the gap between the transmitting collimator and the receiving collimator, partially or completely blocking the light beam, so that the light beam reaching the receiving collimator will change; the receiving collimator connects the received light beam to the optical power collection circuit through the optical fiber, and the optical power collection circuit converts the received optical power into an electrical quantity with a linear relationship and then transmits it to the processing unit. The processing unit can store and process the collected optical power data, and output data such as the circuit breaker opening and closing position status, opening and closing movement stroke, speed, acceleration, etc.

[0027] When the circuit breaker is opened and closed, the moving parts of the circuit breaker move through the gap between the transmitting collimator and the receiving collimator, partially or completely blocking the light spot. There are two possibilities in this process: one is that when the circuit breaker is in the open state, the moving parts of the circuit breaker completely block the light spot, and when the circuit breaker is in the closed state, the moving parts of the circuit breaker do not block the light spot at all; the other is that when the circuit breaker is in the closed state, the moving parts of the circuit breaker completely block the light spot, and when the circuit breaker is in the open state, the moving parts of the circuit breaker do not block the light spot at all. In this case, after the circuit breaker is opened and closed, the optical power changes accordingly. When the circuit breaker is in a steady state, the processing unit collects stable optical power, so that the open and closed positions can be determined according to the size of the optical power. The specific adjustment can be made according to different product design structures. For example, it can be designed that when the optical power is greater than the maximum value of the fixed threshold, it is judged as the open position; when the optical power is less than the minimum value of the fixed threshold, it is judged as the closed position. It can also be designed that when the optical power is greater than the maximum value of the fixed threshold, it is judged as the closed position; when the optical power is less than the minimum value of the fixed threshold, it is judged as the open position. In addition, the processing unit will convert the collected optical power data into analog quantities, and output the travel, speed, acceleration and other data according to the set linear proportional relationship of the sampling value.

[0028] The stable light source may be a laser or LED light source, which is used to continuously output a light beam with stable light power.

[0029] The transmitting collimator outputs a fixed-shape light spot with uniformly distributed optical power, and the size of the light spot in the direction parallel to the movement of the moving part of the circuit breaker is not less than the maximum stroke of the circuit breaker; and the mirror size of the receiving collimator is not less than the light spot size, thereby ensuring that the optical power passing through the moving part of the circuit breaker is fully received.

[0030] The circuit breaker moving part is a light shielding body, which passes through the gap between the transmitting collimator and the receiving collimator and moves up and down during the circuit breaker opening and closing process. Depending on the different movement strokes, it can block part or all of the light beam on the movement path, thereby forming light spots of different areas. There is a linear relationship between the area of ​​the blocked light spot and the movement stroke.

[0031] like Figure 2 As shown, an embodiment of the present invention provides a circuit breaker travel curve testing method, comprising the following steps:

[0032] Step 1, a stable light source continuously outputs a light beam with stable optical power, and the light beam is transmitted from a transmitting collimator to a receiving collimator;

[0033] Step 2: The receiving collimator connects the received light beam to the optical power collection circuit through the optical fiber. The optical power collection circuit converts the received optical power into an electrical quantity with a linear relationship and transmits it to the processing unit. The processing unit can store and process the collected optical power data, and output the circuit breaker opening and closing position status, opening and closing movement stroke, speed, acceleration and other data.

[0034] Due to the opening and closing action of the circuit breaker, the moving parts of the circuit breaker will move up and down in the gap between the transmitting collimator and the receiving collimator, partially or completely blocking the light beam transmitted from the transmitting collimator to the receiving collimator, thereby causing the optical power received by the receiving collimator to change. The processing unit determines the opening and closing state of the circuit breaker based on the optical power data, and calculates the opening and closing movement stroke, speed, acceleration and other movement stroke data.

[0035] like Figure 3 The figure shows a cross-sectional view of a light spot in an embodiment of the present invention. The mirror of the transmitting collimator is a square, the transmitting light beam is a square, and the light power is approximately evenly distributed on the square area. In the absence of shielding, the square light beam emitted by the transmitting collimator can be fully received by the circular mirror of the receiving collimator. When the moving part of the circuit breaker moves downward to the square light spot area, part of the light spot is shielded, so that the light power received by the circular mirror of the receiving collimator is reduced, and the change in light power is linearly related to the change in movement stroke.

[0036] By using the above-mentioned circuit breaker travel curve test system and method, the circuit breaker status can be tested online. The sensor has no mechanical or electrical connection with the circuit breaker operating mechanism, the operating mechanism position only includes non-contact passive optical devices, the test circuit is simple, and has the advantages of high sampling rate, strong anti-interference ability, and small installation volume.

[0037] In the above embodiments, the description of each embodiment has its own emphasis. For the part not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and its core idea of ​​the present application. At the same time, changes or deformations made by those skilled in the art based on the ideas of the present application, the specific implementation methods and the scope of application of the present application, all belong to the scope of protection of the present application. In summary, the content of this specification should not be construed as a limitation on the present application.

Claims

1. A circuit breaker travel curve testing system, characterized in that: It includes a stable light source, a transmitting collimator, a circuit breaker moving part, a receiving collimator, an optical power collection circuit and a processing unit, wherein the output of the stable light source is connected to the tail of the transmitting collimator via an optical fiber, the transmitting collimator and the receiving collimator are arranged opposite to each other, and a gap is left between the transmitting collimator and the receiving collimator for the movement of the circuit breaker moving part; the tail of the receiving collimator is connected to the optical power collection circuit via an optical fiber, and the optical power collection circuit transmits data to the processing unit.

2. The circuit breaker travel curve testing system according to claim 1, characterized in that: The stable light source is a laser or LED light source.

3. The circuit breaker travel curve testing system according to claim 1, characterized in that: The emission collimator outputs a fixed-shape light spot with uniform optical power distribution, and the size of the light spot in the direction parallel to the movement of the moving part of the circuit breaker is not less than the maximum stroke of the circuit breaker; The mirror size of the receiving collimator is not smaller than the light spot size.

4. The circuit breaker travel curve testing system according to claim 3, characterized in that: The circuit breaker moving part is a light shielding body, which passes through the gap between the transmitting collimator and the receiving collimator during the circuit breaker opening and closing process, and blocks light spots of different areas according to different movement strokes. There is a linear relationship between the area of ​​the blocked light spot and the movement stroke.

5. The circuit breaker travel curve testing system according to claim 1, characterized in that: The optical power acquisition circuit converts the received optical power into an electrical quantity with a linear relationship and transmits it to the processing unit.

6. The circuit breaker travel curve testing system according to claim 1, characterized in that: The processing unit stores and processes the optical power data collected by the optical power collection circuit, and outputs the circuit breaker movement data.

7. A circuit breaker travel curve test system testing method as claimed in claim 1, characterized in that The steps include: Step 1, a stable light source continuously outputs a light beam with stable optical power, and the light beam is transmitted from a transmitting collimator to a receiving collimator; Step 2: The receiving collimator connects the received light beam to the optical power collection circuit through the optical fiber. The optical power collection circuit converts the received optical power into an electrical quantity with a linear relationship and transmits it to the processing unit. After processing, the processing unit outputs the circuit breaker opening and closing position status and the circuit breaker movement data including the opening and closing movement stroke, speed, and acceleration.

8. The testing method according to claim 7, characterized in that: In the step 2, the processing unit outputs the open and closed position status of the circuit breaker, including judging the open and closed position status according to the optical power, and judging that the circuit breaker is in the open position when the optical power is greater than the maximum value of the fixed threshold; judging that the circuit breaker is in the closed position when the optical power is less than the minimum value of the fixed threshold; or judging the open and closed position status according to the optical power, and judging that the circuit breaker is in the closed position when the optical power is greater than the maximum value of the fixed threshold; judging that the circuit breaker is in the open position when the optical power is less than the minimum value of the fixed threshold.

9. The testing method according to claim 7, characterized in that: In step 2, the processing unit outputs the circuit breaker motion data including the opening and closing motion stroke, speed, and acceleration, including that the processing unit converts the optical power data into analog quantity and outputs the motion stroke, speed, and acceleration according to a set linear proportional relationship.

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