Testing device for current transformers

Abstract

This utility model relates to the field of power equipment technology and discloses a testing device for a current transformer. The secondary side of the current transformer is connected to a working conductor. The testing device includes a power controller and a testing assembly. The power controller is connected to the primary side of the current transformer. The testing assembly includes a communication module, a detection element, and a current detection module. The communication module is wirelessly connected to the power controller and is used to control the power controller to output a DC pulse current. The detection element is fitted over the working conductor to obtain the magnetic signal around the outer periphery of the working conductor. The current detection module determines the secondary current value and direction of the current transformer based on the magnetic signal. The current transformer can be measured even when the power is off, thus realizing a non-energized, non-interventional testing method. This reduces the contact between technicians and the current transformer during testing, improves the efficiency of testing operations, and reduces safety risks during operation.

Description

Technical Field

[0001] This application relates to the field of power equipment technology, and in particular to a testing device for a current transformer. Background Technology

[0002] In the power industry, when working with current transformers, such as handling power outages and accepting new installations, it is often necessary to check the polarity of the current transformers and the correctness of the circuit installation before formal power transmission. The inspection requires disassembling and reconnecting the circuits, and the inspection operation requires at least two people to complete. After confirmation, the circuits also need to be restored, which consumes too much human resources. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art or related technologies.

[0004] This application proposes a testing device for a current transformer. The secondary side of the current transformer is connected to a working conductor. The testing device includes a power controller and a testing component. The power controller is used to connect to the primary side of the current transformer. The testing component includes a communication module, a detection element, and a current detection module. The communication module is wirelessly connected to the power controller and is used to control the power controller to output a DC pulse current. The detection element is used to be fitted over the working conductor to obtain the magnetic signal around the working conductor. The current detection module determines the secondary current value and direction of the current transformer based on the magnetic signal.

[0005] In some of the technical solutions provided in this application, the test components also include: a calculation module, which is used to calculate the transformation ratio of the current transformer based on the primary current value and the secondary current value of the DC pulse current.

[0006] In some of the technical solutions provided in this application, the test component also includes: an adjustment module, which is wirelessly connected to the power controller and used to adjust the primary current value of the DC pulse current.

[0007] In some of the technical solutions provided in this application, the power controller is provided with a first interface and a second interface for connecting to the device to be charged. The first interface is used to output 12V power and the second interface is used to output 5V power.

[0008] In some of the technical solutions provided in this application, the test components also include: a screen and indicator lights. The screen is communicatively connected to the current detection module and the calculation module. The screen is used to display the secondary current value and the transformation ratio value. The indicator lights are communicatively connected to the current detection module. The indicator lights are used to display the current direction of the secondary current.

[0009] In some of the technical solutions provided in this application, the test components also include: an on-chip amplifier and an analog-to-digital converter. The on-chip amplifier is used to amplify the electrical signal of the secondary current of the current transformer obtained by the current detection module, and the analog-to-digital converter is used to convert the electrical signal into a digital signal.

[0010] In some of the technical solutions provided in this application, the test component further includes: a first energy storage device, which is connected to the current detection module and is used to provide electrical energy.

[0011] In some of the technical solutions provided in this application, the test components also include: a power display module and / or a charging interface, wherein the power display module is used to display the power of the first energy storage device, one end of the charging interface is connected to the first energy storage device, and the other end of the charging interface is used to connect to a power source.

[0012] In some of the technical solutions provided in this application, the testing device further includes: a second energy storage device connected to the input terminal of the power controller, the second energy storage device being used to provide electrical energy.

[0013] In some of the technical solutions provided in this application, the first energy storage device and / or the second energy storage device include multiple lithium batteries connected in series, and the voltage of the first energy storage device and / or the second energy storage device is 12.6V.

[0014] Compared with related technologies, this utility model has at least the following beneficial effects:

[0015] The current detection module, through non-contact testing, can detect the current and polarity of a current transformer without direct contact. The power controller wirelessly outputs test pulses, enabling measurements to be taken even when the power is off. This achieves a non-contact, hands-free testing method, reducing contact between technicians and the current transformer during testing, improving operational safety, and lowering safety risks. Furthermore, the simple and quick operation process improves testing efficiency, reduces manpower required for disassembly and reassembly, minimizes testing time and manpower demands, significantly reduces testing costs, and is easy for technicians to master, reducing training costs and operational complexity. In addition, the testing device described in this application is applicable to various types of current transformers, demonstrating broad applicability. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of some embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0017] Figure 1 A schematic diagram of the structure of a testing device according to an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the structure of a test component provided in one embodiment of this application.

[0019] in, Figure 1 and Figure 2 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0020] 100 Power controller; 200 Test assembly; 210 Communication module; 220 Detection device; 230 Current detection module; 240 Calculation module; 250 Adjustment module; 260 Screen; 270 Indicator light; 280 First energy storage device; 300 Second energy storage device; 20 Current transformer; 21 Working wire; 22 Energy meter. Detailed Implementation

[0021] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0022] Embodiments of this application provide a testing device for a current transformer 20, such as... Figure 1 As shown, the secondary side of the current transformer 20 is connected to the working conductor 21. The test device includes a power controller 100 and a test assembly 200. The power controller 100 is used to connect to the primary side of the current transformer 20. The test assembly 200 includes a communication module 210, a detection element 220, and a current detection module 230. The communication module 210 is wirelessly connected to the power controller 100 and is used to control the power controller 100 to output a DC pulse current. The detection element 220 is used to be fitted over the working conductor 21 to obtain the magnetic signal around the working conductor 21. The current detection module 230 determines the secondary current value and direction of the current transformer 20 based on the magnetic signal.

[0023] In this embodiment, the current transformer 20 is an instrument that measures a large primary current by converting it into a small secondary current based on the principle of electromagnetic induction. Figure 1 In the current transformer 20, the primary side terminals are P1P2 and the secondary side terminals are S1S2. S1S2 is connected to the energy meter 22 through the working wire 21 to measure the current on the primary side of the current transformer 20.

[0024] The communication module 210 is connected to the power controller 100 via a wireless signal. The communication module 210 is used to control the power controller 100 to output a positive DC pulse current to the primary side of the current transformer 20, so that a secondary current is generated on the secondary side of the current transformer 20.

[0025] The test assembly 200 has a detection element 220 at its end. The detection element 220 has a clamp-shaped opening that can open and close. When the clamp-shaped opening is open, it can fit around the outer periphery of the working lead 21, allowing the detection element 220 to capture the magnetic field signal generated by the instantaneous current. The current detection module 230 determines the direction and magnitude of the secondary current of the current transformer under test 20 based on this magnetic signal, thereby obtaining the secondary current value and direction output from the secondary side of the current transformer 20. The current detection module 230 and the detection element 220 form a current sensor. By capturing the direction of the secondary current, it is possible to determine whether the wiring of the secondary circuit of the current transformer under test 20 is correct, thus avoiding test result deviations caused by wiring errors.

[0026] For example, the communication module 210 can be a 2.4G wireless communication module 210JDY-40, providing a line-of-sight communication distance of 120 meters to meet the needs of field testing. The current detection module 230 includes a current measurement chip, which uses a 12-bit high-speed ADC (Analog-to-Digital Converter) chip. Through precise current control and high-precision current measurement, the accuracy and reliability of the test results are improved.

[0027] The current detection module 230, through non-contact testing, can detect the current and polarity of the current transformer 20 without direct contact. The power controller 100 wirelessly outputs test pulses, enabling measurements to be taken even when the power is off. This achieves a non-powered, contactless testing method, reducing contact between technicians and the current transformer 20 during testing, improving operational safety, and lowering safety risks. Furthermore, the simple and quick operation process improves testing efficiency, reduces manpower required for disassembling and reassembling the circuit, reduces manpower and time consumption during testing, significantly lowers testing costs, and is easy for technicians to master quickly, reducing training costs and operational difficulty. In addition, the testing device of this application is applicable to the testing of various types of current transformers 20, exhibiting broad applicability.

[0028] In some embodiments provided in this application, such as Figure 2 As shown, the test component 200 also includes a calculation module 240, which is used to calculate the transformation ratio of the current transformer 20 based on the primary current value and the secondary current value of the DC pulse current.

[0029] In this embodiment, the DC pulse current value emitted by the power controller 100 is the primary current value on the primary side of the current transformer 20. The calculation module 240 calculates the transformation ratio of the current transformer 20 based on the primary current value emitted by the power controller 100 and the secondary current value obtained by the current detection module 230. The transformation ratio is the ratio of the primary current value to the secondary current value, thereby verifying the correct installation of the current transformer 20 under test.

[0030] For example, the computing module 240 can be a 32-bit microcontroller and employ an ARM processor with a clock speed of 72MHz to ensure efficient and stable data processing.

[0031] In some embodiments provided in this application, such as Figure 2 As shown, the test assembly 200 also includes an adjustment module 250, which is wirelessly connected to the power controller 100 and is used to adjust the primary current value of the DC pulse current.

[0032] In this embodiment, the adjustment module 250 controls the power controller 100 via a wireless signal to adjust the magnitude of the DC pulse current emitted by the power controller 100, thereby adjusting the primary current value of the current transformer 20 according to the test requirements, so that the primary current value can meet the test requirements of different current transformers 20, thus expanding the adaptability and application range of the test device.

[0033] In some embodiments provided in this application, the power controller 100 is provided with a first interface and a second interface for connecting to the device to be charged. The first interface is used to output 12V power and the second interface is used to output 5V power.

[0034] In this embodiment, the power controller 100 can be connected to the device to be charged through a first interface and a second interface, thus enabling the power controller 100 to have a charging function. Furthermore, the first interface and the second interface output 12V and 5V voltages respectively, allowing the power controller 100 to provide power output at different voltages to facilitate providing charging power in various situations.

[0035] For example, the first interface can be a DC (Direct Current Interface) interface, and the second interface can be a USB (Universal Serial Bus) interface.

[0036] In some embodiments provided in this application, such as Figure 2As shown, the test component 200 also includes a screen 260 and an indicator light 270. The screen 260 is communicatively connected to the current detection module 230 and the calculation module 240. The screen 260 is used to display the secondary current value and the transformation ratio value. The indicator light 270 is communicatively connected to the current detection module 230. The indicator light 270 is used to display the current direction of the secondary current.

[0037] In this embodiment, screen 260 can receive and display the detection results of current detection module 230 and calculation module 240, and indicator light 270 can receive and display the detection results of current detection module 230. Based on the positive pulse emitted by power controller 100, the direction of primary current of current transformer 20 is defined, thereby determining the expected direction of secondary current. The polarity and connection status of current transformer 20 can be determined by the secondary current direction displayed by indicator light 270. The intuitive display method makes the test results clear at a glance, enabling technicians to obtain the test results more conveniently and directly.

[0038] For example, screen 260 is an LED screen 260, and indicator light 270 is a light-emitting diode. Specifically, indicator light 270 includes a red light and a green light. A green light indicates that the polarity of current transformer 20 is correct, a red light indicates that the polarity of current transformer 20 is incorrect, and neither red nor green light indicates that current transformer 20 is in an open circuit state.

[0039] In some embodiments provided in this application, the test component 200 further includes an on-chip amplifier and an analog-to-digital converter. The on-chip amplifier is used to amplify the electrical signal of the secondary current of the current transformer 20 acquired by the current detection module 230, and the analog-to-digital converter is used to convert the electrical signal into a digital signal.

[0040] In this embodiment, the analog-to-digital converter is a 3.8-microsecond successive approximation analog-to-digital converter. The electrical signal acquired by the current detection module 230 is first amplified by the on-chip amplifier and then converted into a digital signal by the analog-to-digital converter, which facilitates the analysis and calculation of the electrical signal. The test component 200 is also equipped with a high-speed serial interface to ensure high accuracy and fast response of current measurement.

[0041] In some embodiments provided in this application, such as Figure 2 As shown, the test component 200 also includes a first energy storage device 280, which is connected to the current detection module 230 and is used to provide electrical energy.

[0042] In this embodiment, the first energy storage device 280 provides electrical energy to the electrical components in the test assembly 200. The first energy storage device 280 is connected to the communication module 210, the current detection module 230, the calculation module 240, and the adjustment module 250. The first energy storage device 280 can be a battery, so that the test assembly 200 has sufficient electrical energy to carry out the test smoothly.

[0043] In some embodiments provided in this application, the test component 200 further includes: a power display module and / or a charging interface, wherein the power display module is used to display the power of the first energy storage device 280, one end of the charging interface is connected to the first energy storage device 280, and the other end of the charging interface is used to connect to a power source.

[0044] In this embodiment, the power display function enables operators to promptly grasp the remaining power of the first energy storage unit 280, facilitating timely replacement of the first energy storage unit 280 when the power is insufficient, or connecting to a power source via the charging interface to ensure that the test component 200 can be used normally, making the maintenance of the test component 200 more convenient.

[0045] The charging interface can obtain electrical energy from the power source to charge the first energy storage device 280, enabling the first energy storage device 280 to store and release electrical energy, thereby allowing the first energy storage device 280 to be reused repeatedly and improving the utilization efficiency of the first energy storage device 280.

[0046] In some embodiments provided in this application, such as Figure 1 As shown, the testing device also includes a second energy storage device 300, which is connected to the input terminal of the power controller 100. The second energy storage device 300 is used to provide electrical energy.

[0047] In this embodiment, the second energy storage device 300 can provide power to the power controller 100, enabling the power controller 100 to output DC pulses to the primary side of the current transformer 20.

[0048] In some embodiments provided in this application, the first energy storage device 280 and / or the second energy storage device 300 include a plurality of lithium batteries connected in series, and the voltage of the first energy storage device 280 and / or the second energy storage device 300 is 12.6V.

[0049] In this embodiment, in order to ensure that a stable and sufficient current can be provided during the test, the first energy storage device 280 and / or the second energy storage device 300 adopt three 18650 type lithium batteries connected in series, so that the voltage of the first energy storage device 280 and / or the second energy storage device 300 reaches 12.6V, in order to meet the requirements for generating DC pulse current and test current.

[0050] In this utility model, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "join," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "join" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0052] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] The above are merely some embodiments of this utility model and are not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A testing device for a current transformer, characterized in that, The secondary side of the current transformer is connected to the working conductor, and the testing device includes: A power controller is used to connect to the primary side of the current transformer; Test components, the test components include: A communication module is wirelessly connected to the power controller and is used to control the power controller to output DC pulse current. A detection element, which is used to be fitted over the working conductor to obtain the magnetic signal around the outer periphery of the working conductor; The current detection module determines the secondary current value and direction of the current transformer based on the magnetic signal.

2. The testing device for a current transformer according to claim 1, characterized in that, The testing components also include: The calculation module is used to calculate the transformation ratio of the current transformer based on the primary current value and the secondary current value of the DC pulse current.

3. The testing device for a current transformer according to claim 1, characterized in that, The testing components also include: The adjustment module is wirelessly connected to the power controller and is used to adjust the primary current value of the DC pulse current.

4. The testing apparatus for a current transformer according to claim 1, characterized in that, The power controller has a first interface and a second interface for connecting to the device to be charged. The first interface is used to output 12V power, and the second interface is used to output 5V power.

5. The testing apparatus for a current transformer according to claim 2, characterized in that, The testing components also include: The screen is communicatively connected to the current detection module and the calculation module, and the screen is used to display the secondary current value and the transformation ratio value. An indicator light is communicatively connected to the current detection module, and the indicator light is used to display the current direction of the secondary current.

6. The testing apparatus for a current transformer according to any one of claims 1 to 5, characterized in that, The testing components also include: An on-chip amplifier is used to amplify the electrical signal of the secondary current of the current transformer acquired by the current detection module. An analog-to-digital converter is used to convert the electrical signal into a digital signal.

7. The testing apparatus for a current transformer according to any one of claims 1 to 5, characterized in that, The testing components also include: The first energy storage device is connected to the current detection module and is used to provide electrical energy.

8. The testing apparatus for a current transformer according to claim 7, characterized in that, The testing components also include: A power display module is used to display the power level of the first energy storage device; and / or A charging interface, one end of which is connected to the first energy storage device, and the other end of which is used to connect to a power source.

9. The testing apparatus for a current transformer according to claim 7, characterized in that, Also includes: The second energy storage device is connected to the input terminal of the power controller and is used to provide electrical energy.

10. The testing apparatus for a current transformer according to claim 9, characterized in that, The first energy storage device and / or the second energy storage device include multiple lithium batteries connected in series, and the voltage of the first energy storage device and / or the second energy storage device is 12.6V.

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