A circuit breaker pressure sensor online calibration device and calibration method

Abstract

The present invention relates to an online calibration device and method for a circuit breaker pressure sensor. A dedicated online calibration device is installed on a closing housing or an opening housing corresponding to the pressure sensor to be detected. After the dedicated online calibration device is installed, a force driver starts to work, pushing a calibration plate toward the side close to the pressure sensor. At this time, both the standard sensor and the pressure sensor will detect the pressure applied to the calibration plate by the force driver. The data detected by the standard sensor and the pressure sensor are compared and analyzed. The present invention realizes online detection of the pressure sensor by cooperating with the calibration component and the force component, using the force component to apply pressure to the standard sensor to compare the detection data of the standard sensor and the pressure sensor, thereby realizing very convenient online detection of the pressure sensor.

Description

Technical Field

[0001] The invention belongs to the field of circuit breakers, and in particular relates to an online calibration device and a calibration method for a circuit breaker pressure sensor. Background Art

[0002] A circuit breaker (also known as a circuit breaker) is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, as well as closing, carrying, and interrupting current under abnormal circuit conditions within a specified timeframe. Circuit breakers are categorized as high-voltage and low-voltage based on their scope of use. The distinction between high and low voltage is somewhat ambiguous, with devices above 3kV generally considered high-voltage. Circuit breakers are used to distribute electrical energy, infrequently start asynchronous motors, and protect power lines and motors. They automatically disconnect circuits in the event of severe overloads, short circuits, or undervoltage faults. Their functionality is equivalent to a combination of a fuse-type switch and an over- or under-voltage relay. Furthermore, interrupting fault current generally requires no component changes. Currently, they have found widespread application. Power distribution is a crucial component in the generation, transmission, and use of electricity. Power distribution systems include transformers and various high- and low-voltage electrical equipment. Low-voltage circuit breakers are a widely used device.

[0003] Currently, in order to ensure smooth opening and closing operations during the use of circuit breakers, it is necessary to monitor the opening and closing springs. The traditional approach is to install a pressure sensor on both the opening and closing springs to detect the forces acting on them. However, due to the particularity of circuit breakers, which are high-voltage, high-current products, and sensors that are electronic products, the sensors are easily affected by high voltage and high current, resulting in inaccurate data from the pressure sensor or even failure of the pressure sensor. This makes it impossible to determine whether the circuit breaker has successfully completed the opening and closing operations, which in turn affects personnel's misjudgment of the circuit breaker's current state. If personnel attempt to operate the circuit breaker at this time, the circuit breaker may still be in the closed state, i.e., energized, posing a safety hazard.

[0004] To address this phenomenon, it is necessary to regularly test these pressure sensors to ensure the accuracy of the pressure sensor measurement results. The traditional testing method is to first remove the pressure sensor from the corresponding position on the circuit breaker, and then use the testing equipment to test the pressure sensor. If the pressure sensor is still normal, the pressure sensor is reinstalled on the circuit breaker and continued to be used. If the pressure sensor test result is abnormal or has failed, a new pressure sensor needs to be replaced and reinstalled on the circuit breaker. Each test requires the constant removal and installation of the pressure sensor, which is very cumbersome and inconvenient. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides an online calibration device and calibration method for a circuit breaker pressure sensor, which can detect the sensor without disassembling the pressure sensor.

[0006] The present invention specifically adopts the following technical solutions.

[0007] An online calibration device for a circuit breaker pressure sensor. The circuit breaker pressure sensor 1, installed at the moving or static end, is connected to a closing spring or an opening spring 2. A working rod 4 is located within the closing or opening spring 2. The upper end of the working rod 4 passes through the pressure sensor 1 and is connected to a fixing plate 5. The device is characterized by:

[0008] The online verification device includes a verification plate 7, a standard sensor 6 and a force-applying component;

[0009] The standard sensor 6 is fixed on the side of the calibration plate 7 facing the pressure sensor 1;

[0010] One side of the standard sensor 6 is connected to the other side of the fixed plate 5 through a connector 8, and the other side of the standard sensor 6 is fixedly connected to one side of the calibration plate 7;

[0011] A force-applying assembly is installed on the side of the test plate 7 away from the pressure sensor 1. When the force-applying assembly is activated, it pushes the test plate toward the side close to the pressure sensor. The pressure applied to the test plate is detected by the standard sensor and the pressure sensor.

[0012] The present invention further includes the following preferred embodiments.

[0013] The closing spring or opening spring 2 is installed in the respective closing housing or opening housing 3 .

[0014] The lower end of the working pull rod 4 is fixedly connected to the lower end of the closing or opening mechanism body 3.

[0015] The force-applying component includes a force driver 9 and a reaction plate 10. The force driver 9 is opposite to the inspection plate 7 in the force-applying direction and pushes the inspection plate 7 to move when force is applied. The side of the force driver 9 away from the inspection plate 7 is connected to the reaction plate 10, and the reaction plate 10 is fixedly connected to the closing or opening mechanism body 3 on which the closing spring or opening spring 2 is installed.

[0016] The force driver 9 uses a driving mechanism such as a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder to apply force to the standard sensor 6 .

[0017] The online calibration device also includes a pair of connecting lugs 11 and a pair of connecting rods 12. A pair of connecting lugs 11 are symmetrically arranged on the outside of the gate housing or the sub-gate housing 3. Each connecting lug 11 is fixed to the lower end of a connecting rod 12, and a reaction plate 10 is fixed between the upper ends of the two connecting rods 12.

[0018] The upper and lower ends of the connecting rod 12 both have external thread structures, and the reaction plate 10 and the connecting ear 11 both have internal thread structures that match the connecting rod 12. The two ends of the connecting rod 12 pass through the connecting ear 11 and the reaction plate 10 respectively and are locked by the locking nut 13.

[0019] The present invention also discloses an online calibration method for a circuit breaker pressure sensor based on the above-mentioned online calibration device, characterized in that the online calibration method comprises the following steps:

[0020] Step 1: Install the online verification device

[0021] An online calibration device is installed on the closing housing or opening housing to which the pressure sensor to be tested belongs. The standard sensor in the online calibration device is connected to the sensor fixing plate for fixing the pressure sensor to be tested via a coupler.

[0022] Step 2: The force-applying component works, pushing the calibration plate toward the side close to the pressure sensor to be tested. Both the standard sensor and the pressure sensor to be tested detect the pressure applied by the force-applying component to the calibration plate and transmit the data to the display module for display.

[0023] Step 3: Compare and analyze the pressure data detected by the standard sensor and the pressure sensor to be tested. If the relative difference between the two data is within the allowable range, it means that the test result of the pressure sensor to be tested is still accurate. If the relative difference exceeds the allowable range, it means that the test result of the pressure sensor to be tested is inaccurate and the pressure sensor needs to be replaced.

[0024] In step 3, the allowable range of the relative difference is 1%.

[0025] The advantages of the present invention are: the online calibration method of the present invention, through the cooperation of the calibration component and the force-applying component, utilizes the force-applying component to apply pressure to the standard sensor to compare the detection data of the standard sensor and the pressure sensor, thereby realizing online detection of the pressure sensor without removing the pressure sensor, which is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Figure 1 Schematic diagram of the dedicated online verification device of the present invention. DETAILED DESCRIPTION

[0028] The following embodiments may enable those skilled in the art to more fully understand the present invention, but the present invention is not limited to the scope of the embodiments.

[0029] like Figure 1 As shown, the pressure sensor 1 is connected to the closing spring or the opening spring 2, and the closing spring or the opening spring 2 is respectively installed in the respective closing housing or the opening housing 3. The pressure sensor 1 is fixed to the moving end of the closing spring or the opening spring 2. A working rod 4 is also fixedly installed in the closing housing or the opening housing 3. The working rod 4 is located in the closing spring or the opening spring 2, and the other end of the working rod 4 passes through the pressure sensor 1 and is connected to a sensor fixing plate 5.

[0030] The online verification device of the present invention comprises

[0031] A calibration component includes a calibration plate 7 arranged on the side of the closing housing or the opening housing 3 close to the pressure sensor 1, and a standard sensor 6 is also installed on the side of the calibration plate 7 close to the pressure sensor 1. The standard sensor 6 is connected to the sensor fixing plate 5 through a connector 8.

[0032] A force-applying assembly includes a force-applying driver 9 installed on a side of the calibration plate 7 away from the standard sensor 6 .

[0033] The force driver 9 is fixedly connected to the closing or opening housing 3. The connection is as follows: a reaction plate 10 is connected to the side of the force driver 9 away from the standard sensor 6. A pair of connecting lugs 11 are provided on the outside of the closing or opening housing 3. The reaction plate 10 and the connecting lugs 11 are fixedly connected via a pair of connecting rods 12. Both ends of the connecting rods 12 have an external thread structure. Both the reaction plate 10 and the connecting lug 11 have an internal thread structure that matches the connecting rod 12. The two ends of the connecting rod 12 pass through the connecting lug 11 and the reaction plate 10, respectively, and are then locked by a locking nut 13. In this structure, the force driver 9 can use a drive mechanism such as a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder to achieve force application on the standard sensor 6.

[0034] The circuit breaker pressure sensor online verification method of the present invention comprises the following steps:

[0035] The first step is to install the calibration device: First, install a dedicated online calibration device on the closing or opening housing corresponding to the pressure sensor to be tested.

[0036] The second step is pressure detection: after the dedicated online calibration device is installed, the force driver 9 starts to work, pushing the calibration plate 7 to the side close to the pressure sensor 1. At this time, the standard sensor 6 and the pressure sensor 1 will both detect the pressure applied to the calibration plate 7 by the force driver 9 and transmit the data to their respective display modules for display.

[0037] S3: Result comparison: The data detected by the standard sensor 6 and the pressure sensor 1 are compared and analyzed manually or by a computer terminal. If the two data are the same, it means that the detection result of the pressure sensor 1 is still accurate. If the two data are different, it means that the detection result of the pressure sensor 1 is inaccurate and the pressure sensor needs to be replaced.

[0038] The online calibration method of the present invention, through the cooperation of the calibration component and the force-applying component, uses the force-applying component to apply pressure to the standard sensor to compare the detection data of the standard sensor and the pressure sensor, thereby realizing online detection of the pressure sensor without removing the pressure sensor, which is very convenient.

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

Claims

1. An online calibration device for a circuit breaker pressure sensor, wherein the circuit breaker pressure sensor (1) installed at a moving end or a static end is connected to a closing spring or an opening spring (2), a working pull rod (4) is located inside the closing spring or the opening spring (2), and the upper end of the working pull rod (4) passes through the pressure sensor (1) and is connected to a fixing plate (5); the device is characterized in that: The online verification device comprises a verification plate (7), a standard sensor (6) and a force-applying component; The standard sensor (6) is fixed on the side of the calibration plate (7) facing the pressure sensor (1); The standard sensor (6) is connected to the sensor fixing plate (5) via a connector (8), and the other side of the fixing plate (5) is fixedly connected to the pressure sensor (1); A force-applying component is installed on the side of the test plate (7) away from the pressure sensor (1). When the force-applying component is actuated, it pushes the test plate toward the side close to the pressure sensor. The pressure applied to the test plate is detected by the standard sensor and the pressure sensor without removing the pressure sensor. The force-applying assembly includes a force-applying driver (9) and a reaction plate (10), wherein the side of the force-applying driver (9) away from the calibration plate (7) is connected to the reaction plate (10), and the force-applying driver (9) uses a cylinder, a hydraulic cylinder, or an electric cylinder drive mechanism to realize force application on the standard sensor (6); The online calibration device also includes a pair of connecting lugs (11) and a pair of connecting rods (12). A pair of connecting lugs (11) are symmetrically arranged on the outside of the closing housing or the opening housing (3). Each connecting lug (11) is fixed to the lower end of a connecting rod (12), and a reaction plate (10) is fixed between the upper ends of the two connecting rods (12). The upper and lower ends of the connecting rod (12) both have external thread structures, and the reaction plate (10) and the connecting lug (11) both have internal thread structures that match the connecting rod (12). The two ends of the connecting rod (12) respectively pass through the connecting lug (11) and the reaction plate (10) and are locked by a locking nut (13). The closing spring or opening spring (2) is respectively installed in the closing housing or opening housing (3) thereof.

2. The circuit breaker pressure sensor online calibration device according to claim 1, characterized in that: The lower end of the working pull rod (4) is fixedly connected to the lower end of the closing housing or the opening housing (3).

3. The circuit breaker pressure sensor online calibration device according to claim 2, characterized in that: The force-applying driver (9) is opposite to the test plate (7) in the force-applying direction, and pushes the test plate (7) to move when the force is applied; the reaction plate (10) is fixedly connected to the closing housing or the opening housing (3) on which the closing spring or the opening spring (2) is installed.

4. An online calibration method for a circuit breaker pressure sensor based on the online calibration device according to any one of claims 1 to 3, characterized in that: The online verification method comprises the following steps: Step 1: Install the online verification device; An online calibration device is installed on the closing housing or opening housing to which the pressure sensor to be tested belongs. The standard sensor in the online calibration device is connected to the sensor fixing plate for fixing the pressure sensor to be tested via a coupler. Step 2: The force-applying component works, pushing the calibration plate toward the side close to the pressure sensor to be tested. Both the standard sensor and the pressure sensor to be tested detect the pressure applied by the force-applying component to the calibration plate and transmit the data to the display module for display. Step 3: Compare and analyze the pressure data detected by the standard sensor and the pressure sensor to be tested. If the relative difference between the two data is within the allowable range, it means that the test result of the pressure sensor to be tested is still accurate. If the relative difference exceeds the allowable range, it means that the test result of the pressure sensor to be tested is inaccurate and the pressure sensor needs to be replaced.

5. The circuit breaker pressure sensor online verification method according to claim 4, characterized in that: In step 3, the allowable range of the relative difference is 1%.

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