System and method for measuring leakage current of dry-type air-core reactor

Abstract

The invention discloses a system and a method for measuring leakage current of a dry-type air-core reactor, and belongs to the technical field of electrics. The measurement system comprises a measurement controller, a test transformer, a high-voltage rectifier tube and a leakage current measurement meter, the measurement controller is used for accessing an input voltage through an AC power supply, the test transformer is used for amplifying the input voltage according to a preset proportion and outputting a test voltage, the high-voltage rectifier tube is used for converting the test voltage into a DC voltage, the DC voltage is accessed to a tested dry-type air-core reactor, and the tested dry-type air-core reactor is connected to the test transformer. The testing device is used for testing the tested dry-type air-core reactor, and the leakage current measuring meter is used for measuring the leakage current of the tested dry-type air-core reactor in the testing process. According to the invention, leakage tests of different voltage levels can be satisfied, and leakage current measurement can be carried out.

Description

Technical Field

[0001] The present invention relates to the field of electrical technology, and more particularly to a system and method for measuring leakage current of a dry-type air-core reactor. Background Art

[0002] With the widespread use of dry-type air-core reactors in power grids, a series of problems have also emerged in their operation, bringing new unsafe factors to the power system. Affected by operating characteristics and environmental factors, dry-type air-core reactors may be affected by overload, hot and cold shock, rain, overvoltage and other factors after a long period of operation. Operation defects or faults caused by coil dampness, local discharge arc, local overheating, insulation burnout, etc. may occur, which are mainly manifested as external surface tree discharge, local breakdown, turn-to-turn short circuit and burnout. If not handled, due to poor heat dissipation, the reactor may even burn out in a short period of time, seriously affecting the normal operation of the power system.

[0003] The underlying cause of some of these failures is that dry-type air-core reactors use solid insulation. When dry-type air-core transformers are subjected to overload and hot and cold shocks for a long time, tiny cracks appear inside, which, over time, form electrical breakdown paths. Summary of the invention

[0004] In view of the above problems, the present invention proposes a leakage current measurement system for dry-type air-core reactors, comprising: a measurement controller, a test transformer, a high-voltage rectifier tube and a leakage current measurement meter;

[0005] The measurement controller is used to connect the input voltage through an AC power supply, the test transformer is used to amplify the input voltage according to a preset ratio and then output the test voltage, the high-voltage rectifier is used to convert the test voltage into a DC voltage, the DC voltage is connected to the tested dry-type air-core reactor to test the tested dry-type air-core reactor, and the leakage current measurement meter is used to measure the leakage current of the tested dry-type air-core reactor during the test;

[0006] The input end and the output end of the measurement controller are respectively connected to the output end of the AC power supply and the input end of the test transformer, and the output end of the test transformer is connected to the input end of the high-voltage rectifier tube;

[0007] The output end of the high-voltage rectifier tube is connected to the tested dry-type air-core reactor through a test connection.

[0008] Optionally, a protective resistor is installed between the output end of the test transformer and the input end of the high-voltage rectifier tube, and the protective resistor is used to prevent overcurrent caused by a fault in the measurement system.

[0009] Optionally, the measurement system further includes: a test connection, wherein the DC voltage outputted from the output end of the high-voltage rectifier tube is connected to the dry-type air-core reactor under test through the test connection.

[0010] Optionally, test wiring, including: test wire;

[0011] The test line is used for connecting the output end of the high-voltage rectifier tube with the tested dry-type air-core reactor.

[0012] Optionally, the test wiring also includes: short-circuiting wiring;

[0013] The short-circuit wire is used for short-circuiting between the head end and the tail end of the tested dry-type air-core reactor.

[0014] Optionally, the measurement system further includes: a DC voltage divider, which is connected to the dry-type air-core reactor under test and is used to monitor the magnitude of the DC voltage.

[0015] Optionally, the measurement controller is also used to control the magnitude of the input voltage of the AC power input.

[0016] Optional, AC power supply is 0-250V.

[0017] Optionally, the measuring part of the dry-type air-core reactor under test is fixed with a steel rolled strip wound around the outer surface of the dry-type air-core reactor under test, and the two ends of the steel rolled strip are connected and fixed using ceramic plates. Wiring terminals are reserved on the steel rolled strip, and the wiring terminals are grounded through grounding wires. The leakage current measurement meter is connected in series between the wiring terminals and the grounding wire of the dry-type air-core reactor under test.

[0018] Optionally, a test fixture with a wooden structure is provided below the dry-type air-core reactor under test, and the test fixture is used to prevent the dry-type air-core reactor under test from generating heat due to electromagnetic induction.

[0019] Optionally, leakage current measurements at different voltage levels may be performed by adjusting the position of the steel rolled strip at the measuring position of the dry-type air-core reactor under test.

[0020] In yet another aspect, the present invention further provides a computing device, comprising: one or more processors;

[0021] a processor for executing one or more programs;

[0022] When the one or more programs are executed by the one or more processors, the above-described method is implemented.

[0023] In yet another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, the method described above is implemented.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention provides a system for measuring leakage current of a dry-type air-core reactor, comprising: a measurement controller, a test transformer, a high-voltage rectifier tube and a leakage current measuring meter; the measurement controller is used to access an input voltage through an AC power supply, the test transformer is used to amplify the input voltage according to a preset ratio and output a test voltage, the high-voltage rectifier tube is used to convert the test voltage into a DC voltage, the DC voltage is connected to the dry-type air-core reactor under test through a test connection, so as to test the dry-type air-core reactor under test, and the leakage current measuring meter is used to measure the leakage current of the dry-type air-core reactor under test during the test. The present invention can meet the measurement of leakage current. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a structural diagram of the system of the present invention;

[0027] Figure 2 It is the test principle diagram of the system of the present invention;

[0028] Figure 3 It is the wiring diagram of the test product of the system of the present invention;

[0029] Among them, 1 is the measurement control system, 2 is the test transformer, 3 is the protection resistor, 4 is the high-voltage rectifier, 5 is the tested inductor, 6 is the DC high-voltage divider, 7 is the test fixture, 8 is the short-circuit wire, 9 is the steel strip and 10 is the microammeter (leakage current measurement meter). DETAILED DESCRIPTION

[0030] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0031] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0032] Embodiment 1:

[0033] The present invention proposes a system for measuring leakage current of dry-type air-core reactor, such as Figure 1As shown, it includes: a measurement controller, a test transformer, a high-voltage rectifier tube and a leakage current measuring meter;

[0034] The measurement controller is used to connect the input voltage through an AC power supply, the test transformer is used to amplify the input voltage according to a preset ratio and then output the test voltage, the high-voltage rectifier is used to convert the test voltage into a DC voltage, the DC voltage is connected to the tested dry-type air-core reactor to test the tested dry-type air-core reactor, and the leakage current measurement meter is used to measure the leakage current of the tested dry-type air-core reactor during the test;

[0035] The input end and the output end of the measurement controller are respectively connected to the output end of the AC power supply and the input end of the test transformer, and the output end of the test transformer is connected to the input end of the high-voltage rectifier tube;

[0036] The output end of the high-voltage rectifier tube is connected to the tested dry-type air-core reactor through a test connection.

[0037] Wherein, a protective resistor is installed between the output end of the test transformer and the input end of the high-voltage rectifier tube, and the protective resistor is used to prevent overcurrent from being generated due to a fault in the measurement system.

[0038] The measuring system also includes: test wiring, the DC voltage output from the output end of the high-voltage rectifier tube is connected to the tested dry-type air-core reactor through the test wiring.

[0039] Among them, the test wiring includes: test line;

[0040] The test line is used for connecting the output end of the high-voltage rectifier tube with the tested dry-type air-core reactor.

[0041] Among them, the test wiring also includes: short-circuit wiring;

[0042] The short-circuit wire is used for short-circuiting between the head end and the tail end of the tested dry-type air-core reactor.

[0043] The measurement system further includes: a DC voltage divider, which is connected to the dry-type air-core reactor under test and is used to monitor the magnitude of the DC voltage.

[0044] The measurement controller is also used to control the magnitude of the input voltage of the AC power input.

[0045] Among them, the AC power supply is 0-250V.

[0046] Among them, the measuring part of the tested dry-type air-core reactor is fixed with a steel rolled strip wound around the outer surface of the tested dry-type air-core reactor, the two ends of the steel rolled strip are connected and fixed using ceramic plates, and wiring terminals are reserved on the steel rolled strip. The wiring terminals are grounded through grounding wires, and the leakage current measuring meter is connected in series between the wiring terminals and the grounding wire of the tested dry-type air-core reactor.

[0047] A test fixture with a wooden structure is arranged below the tested dry-type air-core reactor, and the test fixture is used to prevent the tested dry-type air-core reactor from generating heat due to electromagnetic induction.

[0048] Among them, leakage current measurements of different voltage levels are performed by adjusting the position of the steel rolled strip at the measuring position of the tested dry-type air-core reactor.

[0049] The present invention will be further described below in conjunction with implementation cases:

[0050] The system structure of the present invention is as follows: Figure 1 As shown, it includes: measurement control system (device), test transformer, protection resistor, high-voltage rectifier, DC voltage divider, steel strip, ceramic plate, test fixture, leakage current measuring meter, tested reactor, etc.

[0051] The test principle is as follows Figure 2 As shown, the test system is powered by a 0-250V AC power supply. The input voltage and current are controlled by the measurement control system. The input voltage is amplified to the test voltage required by the test transformer according to a certain ratio. The AC voltage is converted into DC voltage by a high-voltage rectifier tube, and a protective resistor is added in the middle to prevent overcurrent caused by equipment failure. A DC voltage divider is used to measure and monitor the high voltage output of the test system.

[0052] In order to solve the problem of synchronous measurement of internal and external insulation leakage current, during the test, the test reactor is short-circuited at the beginning and end by short-circuiting the short-circuit wire to apply pressure, such as Figure 3 As shown, at the same time, in order to comprehensively measure the leakage current of the entire path of the reactor, the steel rolled strip is fixed around the outer surface of the reactor for measurement. During measurement, the measurement position can be flexibly adjusted according to the test requirements. A wiring terminal is reserved on the steel rolled strip, and the terminal is grounded in the laboratory. The leakage current measurement meter is connected in series between the steel rolled strip wiring terminal and the grounding point. The leakage current measurement test of the dry-type air-core reactor is completed by reading the leakage current meter reading.

[0053] In order to facilitate the transportation of the test equipment, a dry resistance test fixture is set up under the test equipment. The test fixture adopts a wooden structure, which can effectively avoid the heat generated by the metal due to electromagnetic induction.

[0054] The specific test plan is as follows:

[0055] Adjust the length of the steel strip according to the size of the reactor being tested, and fix the steel strip to the test location where the test is to be carried out.

[0056] Place the equipment under test on top of the test fixture and transport it to the test area.

[0057] According to the dry-type air-core reactor measurement principle diagram, the test wiring is carried out. The voltage is increased through the measurement control system, and the corresponding voltage level is increased according to the test requirements.

[0058] Record the microammeter readings under different voltage levels. After recording, discharge to ground, reduce the test voltage to 0, and cut off the test power supply.

[0059] Adjust the position of the steel strip, increase the voltage again, and record the microammeter readings at different voltage levels.

[0060] The invention has the advantages of being able to simultaneously measure the size of the leakage current flowing through the outer surface and the inner insulation, and being able to flexibly measure the leakage current of different parts. A wooden dry-resistance test tool is arranged below, which is convenient for the transportation of the equipment and can avoid the heating of the test tool. The structure of connecting the steel belt and the ceramic plate can be flexibly adjusted in size according to the outer size of the reactor, and is suitable for full-size equipment testing.

[0061] The present invention uses a short-circuit wire to short-circuit the ends of the reactor as a means of pressurization, and sets a guide steel ring on the equipment body to realize the leakage current measurement test, which can fully test the leakage current on the insulation channel inside and outside the equipment. The test tooling below the test product adopts a wooden structure to avoid heating caused by induction, while ensuring convenient and efficient transportation of the equipment. The output end of the test system is composed of steel slag belt and ceramic, and the circumference of the steel belt can be flexibly adjusted to meet the test requirements of reactors of various sizes.

[0062] Embodiment 2:

[0063] The present invention also proposes a measurement method using the above-mentioned measurement system for leakage current of dry-type air-core reactor, comprising:

[0064] Step 1: Measure the input voltage of the controller connected to the AC power supply;

[0065] Step 2: amplify the input voltage according to a preset ratio through a test transformer to output a test voltage;

[0066] Step 3: converting the test voltage into a DC voltage through a high-voltage rectifier tube, and connecting the DC voltage to the tested dry-type air-core reactor to test the tested dry-type air-core reactor;

[0067] Step 4: Measure the leakage current of the dry-type air-core reactor under test during the test by using a leakage current measuring meter.

[0068] The present invention can meet the requirements of leakage tests at different voltage levels and measure leakage current.

[0069] Embodiment 3:

[0070] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding functions, so as to implement the steps of the method in the above embodiment.

[0071] Embodiment 4:

[0072] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both a built-in storage medium in a computer device and an extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiment.

[0073] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0074] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0075] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0076] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0077] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0078] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A system for measuring leakage current of dry-type air-core reactor, characterized in that: include: Measurement controller, test transformer, high voltage rectifier tube and leakage current measuring meter; The measurement controller is used to connect the input voltage through an AC power supply, the test transformer is used to amplify the input voltage according to a preset ratio and then output the test voltage, the high-voltage rectifier is used to convert the test voltage into a DC voltage, the DC voltage is connected to the tested dry-type air-core reactor to test the tested dry-type air-core reactor, and the leakage current measurement meter is used to measure the leakage current of the tested dry-type air-core reactor during the test; The input end and the output end of the measurement controller are respectively connected to the output end of the AC power supply and the input end of the test transformer, and the output end of the test transformer is connected to the input end of the high-voltage rectifier tube; The output end of the high-voltage rectifier tube is connected to the tested dry-type air-core reactor through a test connection.

2. The measuring system according to claim 1, characterized in that A protective resistor is installed between the output end of the test transformer and the input end of the high-voltage rectifier tube, and the protective resistor is used to prevent overcurrent from being generated due to a fault in the measurement system.

3. The measuring system according to claim 1, characterized in that The measuring system also includes: a test connection, wherein the DC voltage outputted from the output end of the high-voltage rectifier tube is connected to the tested dry-type air-core reactor through the test connection.

4. The measuring system according to claim 3, characterized in that The test wiring comprises: a test line; The test line is used for connecting the output end of the high-voltage rectifier tube with the tested dry-type air-core reactor.

5. The measuring system according to claim 3, characterized in that The test wiring also includes: short-circuiting wiring; The short-circuit wire is used for short-circuiting between the head end and the tail end of the tested dry-type air-core reactor.

6. The measuring system according to claim 1, characterized in that The measurement system also includes: a DC voltage divider, which is connected to the tested dry-type air-core reactor and is used to monitor the magnitude of the DC voltage.

7. The measuring system according to claim 1, characterized in that The measurement controller is also used to control the magnitude of the input voltage of the AC power input.

8. The measuring system according to claim 1, characterized in that The AC power supply is 0-250V.

9. The measuring system according to claim 1, characterized in that A steel rolled strip wound around the outer surface of the dry-type air-core reactor under test is fixed at the measuring position of the dry-type air-core reactor under test, two ends of the steel rolled strip are connected and fixed using ceramic plates, wiring terminals are reserved on the steel rolled strip, the wiring terminals are grounded through a grounding wire, and a leakage current measuring meter is connected in series between the wiring terminals and the grounding wire of the dry-type air-core reactor under test.

10. The measuring system according to claim 1, characterized in that A test fixture with a wooden structure is arranged below the tested dry-type air-core reactor, and the test fixture is used to prevent the tested dry-type air-core reactor from generating heat due to electromagnetic induction.

11. The measuring system according to claim 9, characterized in that By adjusting the position of the steel strip at the measuring position of the tested dry-type air-core reactor, leakage current measurements of different voltage levels are performed.

12. A method for measuring leakage current of a dry-type air-core reactor using a measurement system according to any one of claims 1 to 11, comprising: By measuring the input voltage of the controller connected to the AC power supply; The input voltage is amplified according to a preset ratio by a test transformer to output a test voltage; The test voltage is converted into a direct current voltage through a high-voltage rectifier tube, and the direct current voltage is connected to the dry-type air-core reactor under test to test the dry-type air-core reactor under test; The leakage current of the dry-type air-core reactor under test is measured by a leakage current measuring meter during the test.

13. A computer device, characterized in that: include: one or more processors; a processor for executing one or more programs; When the one or more programs are executed by the one or more processors, the method according to claim 12 is implemented.

14. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the method according to claim 12 is implemented.

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