Transformer transformation ratio test circuit and device
By designing a transformer ratio test circuit and device, the automatic detection of the transformer ratio is realized, which solves the problem that the transformer nameplate ratio does not match the actual ratio, and ensures the reliability of the transformer quality and the convenience of management.
Patent Information
- Application Number
- CN202511092772.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-06
- Publication Date
- 2025-09-26
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the existing technology, the transformer ratio test may show that the nameplate ratio does not match the actual ratio, which makes it difficult to supervise after power is supplied and increases the difficulty of inspection and management.
A transformer ratio test circuit and device are designed, including input and output interfaces, an impedance switching module, a measurement module, a main controller, and a display screen. The ratio is calculated by measuring the voltage at the input and output ends of the transformer, and an integrated circuit is integrated into the device to achieve automated detection.
Ensure the accuracy of transformer ratio detection before the transformer is put into use, reduce the problem of breach of contract during subsequent inspections, and improve the reliability of transformer quality control.
Smart Images
Figure CN120703471A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of transformer ratio testing, and in particular to a transformer ratio testing circuit and device. Background Art
[0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Its main components are a primary coil, a secondary coil, and an iron core (magnetic core). The main functions of a transformer include voltage conversion, current conversion, impedance conversion, isolation, and voltage regulation (magnetic saturation transformer). Transformers can be categorized by their use: distribution transformers, power transformers, fully sealed transformers, combined transformers, dry-type transformers, oil-immersed transformers, single-phase transformers, furnace transformers, rectifier transformers, reactors, anti-interference transformers, lightning protection transformers, box-type transformer test transformers, corner transformers, high-current transformers, and excitation transformers. All of the above transformers are essential equipment for power transmission and distribution, widely used in industry, agriculture, transportation, urban communities, and other fields. my country has approximately 17 million transformers in operation, with a total capacity of approximately 11 billion kilovolt-amperes. Transformer losses account for approximately 40% of power transmission and distribution losses, presenting significant potential for energy savings.
[0003] Before a transformer is put into operation, it must undergo acceptance testing. One of the inspection tasks is testing the transformer's turns ratio. The transformer's turns ratio (i.e., voltage ratio) is the ratio between the input voltage and the output voltage under no-load conditions. The transformer's turns ratio is marked on the nameplate. If the nameplate's turns ratio doesn't match the actual value, post-power supply monitoring becomes difficult, preventing further anomalies and complicating subsequent audits and management.
[0004] To this end, the present invention provides a transformer ratio testing circuit and device for solving any of the above technical problems. Summary of the Invention
[0005] The object of the present invention is to provide a transformer ratio testing circuit and device for solving any of the above technical problems.
[0006] In order to achieve the above object, the present invention provides the following technical solutions: In a first aspect, a transformer ratio test circuit is provided, the circuit comprising an input A-phase interface, an input B-phase interface, and an input C-phase interface, wherein the high-voltage side A-phase interface, the high-voltage side B-phase interface, and the high-voltage side C-phase interface are used to connect to the input end of the transformer to be tested; The circuit further includes an output end a-phase interface, an output end b-phase interface and an output end c-phase interface, wherein the output end a-phase interface, the output end b-phase interface and the output end c-phase interface are used to connect to the output end of the transformer to be tested; The circuit further includes an input end A phase wiring cable, an input end B phase wiring cable, an input end C phase wiring cable, an output end a phase wiring cable, an output end b phase wiring cable and an output end c phase wiring cable; The circuit also includes a power interface for accessing a test power supply; The first ends of the input-end A-phase wiring cable, the input-end B-phase wiring cable, and the input-end C-phase wiring cable are all connected to the power interface; The second end of the input end A phase wiring cable is connected to the input end A phase interface, the second end of the input end B phase wiring cable is connected to the input end B phase interface, and the second end of the input end C phase wiring cable is connected to the input end C phase interface; The circuit further includes an impedance switching module, wherein the impedance module is used to provide impedance matching for the transformer to be tested; The first ends of the output-end a-phase wiring cable, the output-end b-phase wiring cable, and the output-end c-phase wiring cable are all connected to the impedance switching module; The second end of the output end a phase wiring cable is connected to the output end a phase interface, the second end of the output end b phase wiring cable is connected to the output end b phase interface, and the second end of the output end c phase wiring cable is connected to the output end c phase interface; The circuit further includes an input terminal measurement module for measuring the voltage at the input terminal of the transformer to be tested and an output terminal measurement module for measuring the voltage at the output terminal of the transformer to be tested; The circuit further includes a main controller, which is connected to the input end measurement module and the output end measurement module respectively, and is used to calculate the transformation ratio between the input end and the output end of the transformer to be tested based on the voltages measured by the input end measurement module and the output end measurement module; The circuit further comprises a display screen, the main controller is connected to the display screen, and the display screen is used to display the calculated transformation ratio of the transformer.
[0007] Furthermore, the input end measurement module includes a first high voltage voltmeter, a second high voltage voltmeter and a third high voltage voltmeter, and the output end measurement module includes a first low voltage voltmeter, a second low voltage voltmeter and a third low voltage voltmeter; The first high-voltage voltmeter is connected in parallel between the input end A phase wiring cable and the input end B phase wiring cable, and is used to collect the voltage between the input end A phase wiring cable and the input end B phase wiring cable; The second high-voltage voltmeter is connected in parallel between the input end A phase wiring cable and the input end C phase wiring cable, and is used to collect the voltage between the input end A phase wiring cable and the input end C phase wiring cable; A third high-voltage voltmeter is connected in parallel to the input-end B-phase wiring cable and the input-end C-phase wiring cable, and is used to collect the voltage between the input-end B-phase wiring cable and the input-end C-phase wiring cable; A first low-voltage voltmeter is connected in parallel to the input end a-phase wiring cable and the input end b-phase wiring cable, and is used to collect the voltage between the input end a-phase wiring cable and the input end b-phase wiring cable; A second low-voltage voltmeter is connected in parallel to the input end a-phase wiring cable and the input end c-phase wiring cable, and is used to collect the voltage between the input end a-phase wiring cable and the input end c-phase wiring cable; A third low-voltage voltmeter is connected in parallel to the input end b-phase wiring cable and the input end c-phase wiring cable, and is used to collect the voltage between the input end b-phase wiring cable and the input end c-phase wiring cable; The main controller is connected to the first high-voltage voltmeter, the second high-voltage voltmeter, the third high-voltage voltmeter, the first low-voltage voltmeter, the second low-voltage voltmeter and the third low-voltage voltmeter respectively.
[0008] Furthermore, the impedance switching module includes: a first low-voltage resistor , the first medium voltage resistor , the first high voltage resistor , the first low-voltage switch , the first medium voltage switch , the first high-voltage switch , the second low voltage resistor , the second medium voltage resistor , the second high voltage resistor , Second low voltage switch , Second medium voltage switch , the second high-voltage switch , the third low voltage resistor , the third medium voltage resistor , the third high voltage resistor , the third low-voltage switch , the third medium voltage switch and the third high voltage switch ; The first low voltage resistor The first end of the first medium voltage resistor The first end of the first high-voltage resistor The first end of the second low voltage resistor The first end of the second medium voltage resistor The first end and the second high voltage resistor The first end of each is connected to the output terminal c phase interface; The first low voltage resistor The second end is connected to the first low-voltage switch The first end of the first medium voltage resistor The second end is connected to the first medium voltage switch The first end of the first high voltage resistor The second end is connected to the first high voltage switch The first end of Second low voltage resistor The second end is connected to the second low-voltage switch The first end of the second medium voltage resistor The second end is connected to the second medium voltage switch The first end of the second high voltage resistor The second end is connected to the second high voltage switch The first end of First low voltage switch The second end of the first medium voltage switch The second end of the first high-voltage switch The second end of the third low voltage resistor The first end of the third medium voltage resistor The first end and the third high voltage resistor The first end of each is connected to the output terminal b interface; The third low voltage resistor The second end is connected to the third low-voltage switch The first end of the third medium voltage resistor The second end is connected to the third medium voltage switch The first end of the third high voltage resistor The second end is connected to the third high voltage switch The first end of Second low voltage switch The second end of the second medium voltage switch The second end of the second high-voltage switch The second end of the third low-voltage switch The second end of the third medium voltage switch The second end and the third high voltage switch The second ends of the two terminals are connected to the output terminal a interface; First low voltage switch , Second low voltage switch and the third low voltage switch Use the first linkage switch; First medium voltage switch , Second medium voltage switch and the third medium voltage switch Use the second linkage switch; First high voltage switch , the second high-voltage switch and the third high voltage switch Use a third linkage switch.
[0009] Furthermore, a power switch is connected in series to the input-end A-phase wiring cable, the input-end B-phase wiring cable, and the input-end C-phase wiring cable.
[0010] Furthermore, a first high-voltage ammeter is connected in series to the input A phase wiring cable. , a second high-voltage ammeter is connected in series to the input B phase wiring cable , a third high-voltage ammeter is connected in series to the C-phase wiring cable at the input end. The first low-voltage ammeter is connected in series to the output a phase wiring cable. , a second low-voltage ammeter is connected in series to the output terminal b phase wiring cable , a second low-voltage ammeter is connected in series to the output phase C wiring cable ; The main controller is respectively connected to the first high voltage ammeter , Second high-voltage ammeter , the third high-voltage ammeter , the first low-voltage ammeter , Second low voltage ammeter and the second low voltage ammeter The cables are connected to each other for collecting current data on the input-end A-phase wiring cable, the input-end B-phase wiring cable, the input-end C-phase wiring cable, the output-end A-phase wiring cable, the output-end B-phase wiring cable, and the output-end C-phase wiring cable.
[0011] Furthermore, the display screen is also used to display the current data.
[0012] Furthermore, the circuit also includes an alarm; The main controller is connected to the alarm and is used to control the alarm to sound an alarm when the monitored current data is overcurrent.
[0013] In a second aspect, a transformer ratio test device is provided, the device comprising a box and the transformer ratio test circuit according to any one of the above aspects; The transformer ratio test circuit is integrated in the box; The input A-phase interface, input B-phase interface, input C-phase interface, output A-phase interface, output B-phase interface, output C-phase interface, power supply interface and display screen of the transformer ratio test circuit are all integrated on the box.
[0014] Furthermore, when the transformer ratio test circuit includes a first linkage switch, a second linkage switch and a third linkage switch, the first linkage switch, the second linkage switch and the third linkage switch are all integrated on the box.
[0015] Furthermore, when the transformer ratio test circuit includes a power switch, the power switch is integrated on the box.
[0016] The beneficial effects of the present invention are as follows: before the transformer to be tested is put into use, the transformer ratio test circuit is used to test its ratio, and the test value is compared with the value on the nameplate of the transformer to be tested to ensure that the transformer to be tested has no quality problems to be sold, thereby reducing the problem of breach of contract during subsequent inspections; When using this device, it is only necessary to select the corresponding impedance of the transformer to be tested through the impedance switching module, and then connect the input end coil of the transformer to be tested to the corresponding input end A phase interface, input end B phase interface and input end C phase interface respectively, and connect the output end coil of the transformer to be tested to the corresponding output end A phase interface, output end B phase interface and output end C phase interface respectively. The input end measurement module measures the input end voltage of the transformer to be tested, and the output end measurement module measures the output end voltage of the transformer to be tested. The main control module calculates the transformation ratio based on the voltages measured by the input end measurement module and the output end measurement module, and finally displays it on the display screen.
[0017] These and other objects, features and advantages of the present invention will be fully reflected in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 The circuit principle diagram of the transformer ratio testing circuit of the present invention is shown.
[0019] Figure 2 The figure shows a schematic diagram of the transformer ratio testing circuit in use according to the present invention.
[0020] Figure 3 The figure shows a front view of the transformer ratio testing device of the present invention. DETAILED DESCRIPTION
[0021] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.
[0022] It should be understood by those skilled in the art that, in the disclosure of the specification, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or are inherent to these processes, methods, products or apparatuses. Therefore, the above terms should not be understood as limiting the present invention.
[0023] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.
[0024] refer to Figure 1 and Figure 2 A transformer ratio test circuit according to a preferred embodiment of the present invention will be described in detail below, wherein the circuit includes an input A-phase interface, an input B-phase interface and an input C-phase interface, and the high-voltage side A-phase interface, the high-voltage side B-phase interface and the high-voltage side C-phase interface are used to connect to the input end of the transformer to be tested.
[0025] The input end of the transformer under test includes an X winding, a Y winding, and a Z winding. The input end A phase interface is used to connect to the X winding of the input end of the transformer under test, the input end B phase interface is used to connect to the Y winding of the input end of the transformer under test, and the input end C phase interface is used to connect to the Z winding of the input end of the transformer under test.
[0026] The circuit also includes an output end a phase interface, an output end b phase interface and an output end c phase interface, and the output end a phase interface, the output end b phase interface and the output end c phase interface are used to connect to the output end of the transformer to be tested.
[0027] The output end of the transformer under test includes an x-winding, a y-winding, and a z-winding. The output end a-phase interface is used to connect to the x-winding of the output end of the transformer under test, the output end b-phase interface is used to connect to the y-winding of the output end of the transformer under test, and the output end c-phase interface is used to connect to the z-winding of the output end of the transformer under test.
[0028] The circuit further includes an input A-phase wiring cable, an input B-phase wiring cable, an input C-phase wiring cable, an output A-phase wiring cable, an output B-phase wiring cable, and an output C-phase wiring cable.
[0029] The circuit also includes a power interface for connecting to a test power supply. In this embodiment, the power interface adopts a three-phase power interface A, B, and C, wherein phase A of the power interface is used to connect to phase A of an external power supply, phase B of the power interface is used to connect to phase B of an external power supply, and phase C of the power interface is used to connect to phase C of an external power supply.
[0030] The first ends of the input-end A-phase wiring cable, the input-end B-phase wiring cable, and the input-end C-phase wiring cable are all connected to the power interface.
[0031] The second end of the input A phase wiring cable is connected to the input A phase interface, the second end of the input B phase wiring cable is connected to the input B phase interface, and the second end of the input C phase wiring cable is connected to the input C phase interface.
[0032] The circuit further includes an impedance switching module, and the impedance module is used to provide impedance matching for the transformer to be tested.
[0033] The first ends of the output-end a-phase wiring cable, the output-end b-phase wiring cable, and the output-end c-phase wiring cable are all connected to the impedance switching module.
[0034] The second end of the output end a phase wiring cable is connected to the output end a phase interface, the second end of the output end b phase wiring cable is connected to the output end b phase interface, and the second end of the output end c phase wiring cable is connected to the output end c phase interface.
[0035] The circuit further includes an input terminal measurement module for measuring the voltage at the input terminal of the transformer to be measured and an output terminal measurement module for measuring the voltage at the output terminal of the transformer to be measured.
[0036] The circuit also includes a main controller, which is connected to the input end measurement module and the output end measurement module respectively, and is used to calculate the transformation ratio of the input end and the output end of the transformer to be tested based on the voltages measured by the input end measurement module and the output end measurement module.
[0037] The circuit further comprises a display screen, the main controller is connected to the display screen, and the display screen is used to display the calculated transformation ratio of the transformer.
[0038] Combine Figure 2 The "..." between the input-end A-phase interface and the X-winding at the input of the transformer under test indicates that the input-end A-phase interface is connected to the X-winding at the input of the transformer under test. The "..." between the input-end B-phase interface and the Y-winding at the input of the transformer under test indicates that the input-end B-phase interface is connected to the Y-winding at the input of the transformer under test. The "..." between the input-end C-phase interface and the Z-winding at the input of the transformer under test indicates that the input-end C-phase interface is connected to the Z-winding at the input of the transformer under test. The "..." between the output-end A-phase interface and the X-winding at the output of the transformer under test indicates that the output-end A-phase interface is connected to the X-winding at the output of the transformer under test. The "..." between the output-end B-phase interface and the Y-winding at the output of the transformer under test indicates that the output-end B-phase interface is connected to the Y-winding at the output of the transformer under test. The "..." between the output-end C-phase interface and the Z-winding at the output of the transformer under test indicates that the output-end C-phase interface is connected to the Z-winding at the output of the transformer under test.
[0039] Before the transformer to be tested is put into use, the transformer ratio test circuit is used to test its ratio, and the test value is compared with the value on the nameplate of the transformer to be tested to ensure that there are no quality problems in the transformer to be sold, reducing the problem of breach of contract during subsequent audits; When in use, it is only necessary to select the corresponding impedance of the transformer to be tested through the impedance switching module, and then connect the input end coil of the transformer to be tested to the corresponding input end A phase interface, input end B phase interface and input end C phase interface respectively, and connect the output end coil of the transformer to be tested to the corresponding output end A phase interface, output end B phase interface and output end C phase interface respectively. The input end measurement module measures the input end voltage of the transformer to be tested, and the output end measurement module measures the output end voltage of the transformer to be tested. The main control module calculates the transformation ratio based on the voltages measured by the input end measurement module and the output end measurement module, and finally displays it on the display screen.
[0040] Exemplarily, the input-end measurement module includes a first high-voltage voltmeter, a second high-voltage voltmeter, and a third high-voltage voltmeter, and the output-end measurement module includes a first low-voltage voltmeter, a second low-voltage voltmeter, and a third low-voltage voltmeter.
[0041] The first high-voltage voltmeter is connected in parallel between the input end A phase wiring cable and the input end B phase wiring cable, and is used to collect the voltage between the input end A phase wiring cable and the input end B phase wiring cable.
[0042] The second high-voltage voltmeter is connected in parallel between the input-end A-phase wiring cable and the input-end C-phase wiring cable, and is used to collect the voltage between the input-end A-phase wiring cable and the input-end C-phase wiring cable.
[0043] The third high-voltage voltmeter is connected in parallel to the input-end B-phase wiring cable and the input-end C-phase wiring cable, and is used to collect the voltage between the input-end B-phase wiring cable and the input-end C-phase wiring cable.
[0044] The first low-voltage voltmeter is connected in parallel to the input end a-phase wiring cable and the input end b-phase wiring cable, and is used to collect the voltage between the input end a-phase wiring cable and the input end b-phase wiring cable.
[0045] The second low-voltage voltmeter is connected in parallel to the input end a phase wiring cable and the input end c phase wiring cable, and is used to collect the voltage between the input end a phase wiring cable and the input end c phase wiring cable.
[0046] The third low-voltage voltmeter is connected in parallel to the input end b-phase wiring cable and the input end c-phase wiring cable, and is used to collect the voltage between the input end b-phase wiring cable and the input end c-phase wiring cable.
[0047] The main controller is respectively connected to the first high-voltage voltmeter, the second high-voltage voltmeter, the third high-voltage voltmeter, the first low-voltage voltmeter, the second low-voltage voltmeter and the third low-voltage voltmeter, and is used to calculate the transformation ratio between the input and output ends of the transformer to be tested.
[0048] When in use, connect the X winding at the input end of the transformer to be tested to the input end A phase interface, connect the Y winding at the input end of the transformer to be tested to the input end B phase interface, connect the Z winding at the input end of the transformer to be tested to the input end C phase interface, connect the X winding at the output end of the transformer to be tested to the output end A phase interface, connect the Y winding at the output end of the transformer to be tested to the output end B phase interface, and connect the Z winding at the output end of the transformer to be tested to the output end C phase interface.
[0049] The first high-voltage voltmeter collects the voltage between the input terminal A phase wiring cable and the input terminal B phase wiring cable, and this voltage is recorded as the first high-voltage voltage The second high voltage voltmeter collects the voltage between the input A phase wiring cable and the input C phase wiring cable, and this voltage is recorded as the second high voltage voltage. The third high voltage voltmeter collects the voltage between the input terminal B phase wiring cable and the input terminal C phase wiring cable, and this voltage is recorded as the third high voltage voltage. The first low voltage voltmeter collects the voltage between the input a phase wiring cable and the input b phase wiring cable, and this voltage is recorded as the first low voltage The second low voltage voltmeter collects the voltage between the input a phase wiring cable and the input c phase wiring cable, and this voltage is recorded as the second low voltage The third low voltage meter collects the voltage between the input terminal b phase wiring cable and the input terminal c phase wiring cable, and this voltage is recorded as the third low voltage .
[0050] The main controller collects the first high voltage and the first low voltage , calculate the transformation ratio between the X winding at the input end and the x winding at the output end of the transformer under test The main controller collects the second high voltage and the second low voltage , calculate the transformation ratio between the Y winding at the input end and the Y winding at the output end of the transformer under test The main controller collects the third high voltage and the third low voltage , calculate the transformation ratio between the Z winding at the input end and the Z winding at the output end of the transformer under test .
[0051] By comparing the transformation ratio on the nameplate of the transformer to be tested with the transformation ratio between the X winding at the input end and the X winding at the output end of the transformer to be tested , judge whether the ratio between the X winding at the input end and the x winding at the output end on the nameplate of the transformer to be tested is accurate. By comparing the ratio on the nameplate of the transformer to be tested with the calculated ratio between the Y winding at the input end and the y winding at the output end of the transformer to be tested , judge whether the ratio between the Y winding at the input end and the Y winding at the output end on the nameplate of the transformer to be tested is accurate. By comparing the ratio on the nameplate of the transformer to be tested with the calculated ratio between the Z winding at the input end and the Z winding at the output end of the transformer to be tested , determine whether the transformation ratio between the Z winding at the input end and the Z winding at the output end on the nameplate of the transformer to be tested is accurate.
[0052] In this embodiment, the impedance switching module includes: a first low-voltage resistor , the first medium voltage resistor , the first high voltage resistor , the first low-voltage switch , the first medium voltage switch , the first high-voltage switch , the second low voltage resistor , the second medium voltage resistor , the second high voltage resistor , Second low voltage switch , Second medium voltage switch , the second high-voltage switch , the third low voltage resistor , the third medium voltage resistor , the third high voltage resistor , the third low-voltage switch , the third medium voltage switch and the third high voltage switch .
[0053] The first low voltage resistor The first end of the first medium voltage resistor The first end of the first high-voltage resistor The first end of the second low voltage resistor The first end of the second medium voltage resistor The first end and the second high voltage resistor The first end of each is connected to the output terminal c phase interface.
[0054] The first low voltage resistor The second end is connected to the first low-voltage switch The first end of the first medium voltage resistor The second end is connected to the first medium voltage switch The first end of the first high voltage resistor The second end is connected to the first high voltage switch The first end.
[0055] Second low voltage resistor The second end is connected to the second low-voltage switch The first end of the second medium voltage resistor The second end is connected to the second medium voltage switch The first end of the second high voltage resistor The second end is connected to the second high voltage switch The first end.
[0056] First low voltage switch The second end of the first medium voltage switch The second end of the first high-voltage switch The second end of the third low voltage resistor The first end of the third medium voltage resistor The first end and the third high voltage resistor The first end of each is connected to the output end b phase interface.
[0057] The third low voltage resistor The second end is connected to the third low-voltage switch The first end of the third medium voltage resistor The second end is connected to the third medium voltage switch The first end of the third high voltage resistor The second end is connected to the third high voltage switch The first end.
[0058] Second low voltage switch The second end of the second medium voltage switch The second end of the second high-voltage switch The second end of the third low-voltage switch The second end of the third medium voltage switch The second end and the third high voltage switch The second ends of the two terminals are connected to the output terminal a interface.
[0059] First low voltage switch , Second low voltage switch and the third low voltage switch It is realized by using the first linkage switch.
[0060] First medium voltage switch , Second medium voltage switch and the third medium voltage switch This is achieved using a second linkage switch.
[0061] First high voltage switch , the second high-voltage switch and the third high voltage switch It is realized by using the third linkage switch.
[0062] It can be understood that the first linkage switch includes a first low-voltage switch , Second low voltage switch and the third low voltage switch The second linkage switch includes the first medium voltage switch , Second medium voltage switch and the third medium voltage switch , the third linkage switch includes the first high voltage switch , the second high-voltage switch and the third high voltage switch .
[0063] A power switch is connected in series to the input end A phase wiring cable, the input end B phase wiring cable, and the input end C phase wiring cable.
[0064] During use, connect the X winding at the input of the transformer under test to the input phase A interface, the Y winding at the input of the transformer under test to the input phase B interface, the Z winding at the input of the transformer under test to the input phase C interface, the X winding at the output of the transformer under test to the output phase A interface, the Y winding at the output of the transformer under test to the output phase B interface, and the Z winding at the output of the transformer under test to the output phase C interface. Then, depending on the specifications of the transformer under test, press the first linkage switch, the second linkage switch, or the third linkage switch, then press the power switch to turn on the external power supply and begin measuring the transformer's turns ratio.
[0065] For example, a first high-voltage ammeter is connected in series to the input A phase wiring cable. , a second high-voltage ammeter is connected in series to the input B phase wiring cable , a third high-voltage ammeter is connected in series to the C-phase wiring cable at the input end. The first low-voltage ammeter is connected in series to the output a phase wiring cable. , a second low-voltage ammeter is connected in series to the output terminal b phase wiring cable , a second low-voltage ammeter is connected in series to the output phase C wiring cable .
[0066] The main controller is respectively connected to the first high voltage ammeter , Second high-voltage ammeter , the third high-voltage ammeter , the first low-voltage ammeter , Second low voltage ammeter and the second low voltage ammeter The cables are connected to each other for collecting current data on the input-end A-phase wiring cable, the input-end B-phase wiring cable, the input-end C-phase wiring cable, the output-end A-phase wiring cable, the output-end B-phase wiring cable, and the output-end C-phase wiring cable.
[0067] The display screen is also used to display the current data.
[0068] The circuit further includes an alarm, and the main controller is connected to the alarm and is used to control the alarm to sound an alarm when the current data is monitored to be overcurrent.
[0069] Combine Figure 3 The present invention also provides a transformer ratio testing device, which includes a box and the transformer ratio testing circuit described in the above embodiments, and the transformer ratio testing circuit is integrated in the box.
[0070] The input A-phase interface, input B-phase interface, input C-phase interface, output A-phase interface, output B-phase interface, output C-phase interface, power supply interface and display screen of the transformer ratio test circuit are all integrated on the box.
[0071] When the transformer ratio test circuit includes a first linkage switch, a second linkage switch and a third linkage switch, the first linkage switch, the second linkage switch and the third linkage switch are all integrated on the box.
[0072] It is understandable that the first low voltage switch , Second low voltage switch and the third low voltage switch The first linkage switch is integrated on the box body. When the first linkage switch is pressed, the first low-voltage switch is realized. , Second low voltage switch and the third low voltage switch linkage.
[0073] First medium voltage switch , Second medium voltage switch and the third medium voltage switch The second linkage switch is integrated into the box. When the second linkage switch is pressed, the first medium voltage switch is , Second medium voltage switch and the third medium voltage switch linkage.
[0074] First high voltage switch , the second high-voltage switch and the third high voltage switch The third linkage switch is integrated on the box. When the third linkage switch is pressed, the first high-voltage switch is , the second high-voltage switch and the third high voltage switch linkage.
[0075] When the transformer ratio test circuit includes a power switch, the power switch is integrated on the box, and the power switch is used to connect power to the device.
[0076] When using this device, it is only necessary to select the corresponding impedance of the transformer to be tested through the impedance switching module, and then connect the input end coil of the transformer to be tested to the corresponding input end A phase interface, input end B phase interface and input end C phase interface respectively, and connect the output end coil of the transformer to be tested to the corresponding output end A phase interface, output end B phase interface and output end C phase interface respectively. The input end measurement module measures the input end voltage of the transformer to be tested, and the output end measurement module measures the output end voltage of the transformer to be tested. The main control module calculates the transformation ratio based on the voltages measured by the input end measurement module and the output end measurement module, and finally displays it on the display screen.
[0077] Exemplarily, the box further includes a grounding port, which is equipped with a grounding wire. The grounding port is used to connect to the grounding wire. When leakage current occurs, the grounding wire connected to the grounding port is connected to the ground.
[0078] It should be noted that the terms "first" and "second" in the present invention are only used for descriptive purposes and do not indicate any order. They cannot be understood as indicating or implying relative importance. These terms can be interpreted as names.
[0079] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended to be illustrative only and are not intended to limit the present invention. The advantages of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.
Claims
1. A transformer ratio test circuit, characterized in that: The circuit includes an input end A phase interface, an input end B phase interface and an input end C phase interface, and the high-voltage side A phase interface, the high-voltage side B phase interface and the high-voltage side C phase interface are used to connect to the input end of the transformer to be tested; The circuit further includes an output end a-phase interface, an output end b-phase interface and an output end c-phase interface, wherein the output end a-phase interface, the output end b-phase interface and the output end c-phase interface are used to connect to the output end of the transformer to be tested; The circuit further includes an input end A phase wiring cable, an input end B phase wiring cable, an input end C phase wiring cable, an output end a phase wiring cable, an output end b phase wiring cable and an output end c phase wiring cable; The circuit also includes a power interface for accessing a test power supply; The first ends of the input-end A-phase wiring cable, the input-end B-phase wiring cable, and the input-end C-phase wiring cable are all connected to the power interface; The second end of the input end A phase wiring cable is connected to the input end A phase interface, the second end of the input end B phase wiring cable is connected to the input end B phase interface, and the second end of the input end C phase wiring cable is connected to the input end C phase interface; The circuit further includes an impedance switching module, wherein the impedance module is used to provide impedance matching for the transformer to be tested; The first ends of the output-end a-phase wiring cable, the output-end b-phase wiring cable, and the output-end c-phase wiring cable are all connected to the impedance switching module; The second end of the output end a phase wiring cable is connected to the output end a phase interface, the second end of the output end b phase wiring cable is connected to the output end b phase interface, and the second end of the output end c phase wiring cable is connected to the output end c phase interface; The circuit further includes an input terminal measurement module for measuring the voltage at the input terminal of the transformer to be tested and an output terminal measurement module for measuring the voltage at the output terminal of the transformer to be tested; The circuit further includes a main controller, which is connected to the input end measurement module and the output end measurement module respectively, and is used to calculate the transformation ratio between the input end and the output end of the transformer to be tested based on the voltages measured by the input end measurement module and the output end measurement module; The circuit further comprises a display screen, the main controller is connected to the display screen, and the display screen is used to display the calculated transformation ratio of the transformer.
2. The transformer ratio test circuit according to claim 1, wherein: The input end measurement module includes a first high voltage voltmeter, a second high voltage voltmeter and a third high voltage voltmeter, and the output end measurement module includes a first low voltage voltmeter, a second low voltage voltmeter and a third low voltage voltmeter; The first high-voltage voltmeter is connected in parallel between the input end A phase wiring cable and the input end B phase wiring cable, and is used to collect the voltage between the input end A phase wiring cable and the input end B phase wiring cable; The second high-voltage voltmeter is connected in parallel between the input end A phase wiring cable and the input end C phase wiring cable, and is used to collect the voltage between the input end A phase wiring cable and the input end C phase wiring cable; A third high-voltage voltmeter is connected in parallel to the input-end B-phase wiring cable and the input-end C-phase wiring cable, and is used to collect the voltage between the input-end B-phase wiring cable and the input-end C-phase wiring cable; A first low-voltage voltmeter is connected in parallel to the input end a-phase wiring cable and the input end b-phase wiring cable, and is used to collect the voltage between the input end a-phase wiring cable and the input end b-phase wiring cable; A second low-voltage voltmeter is connected in parallel to the input end a-phase wiring cable and the input end c-phase wiring cable, and is used to collect the voltage between the input end a-phase wiring cable and the input end c-phase wiring cable; A third low-voltage voltmeter is connected in parallel to the input end b-phase wiring cable and the input end c-phase wiring cable, and is used to collect the voltage between the input end b-phase wiring cable and the input end c-phase wiring cable; The main controller is connected to the first high-voltage voltmeter, the second high-voltage voltmeter, the third high-voltage voltmeter, the first low-voltage voltmeter, the second low-voltage voltmeter and the third low-voltage voltmeter respectively.
3. The transformer ratio test circuit according to claim 1, wherein: The impedance switching module includes: a first low-voltage resistor , the first medium voltage resistor , the first high voltage resistor , the first low-voltage switch , the first medium voltage switch , the first high-voltage switch , the second low voltage resistor , the second medium voltage resistor , the second high voltage resistor , Second low voltage switch , Second medium voltage switch , the second high-voltage switch , the third low voltage resistor , the third medium voltage resistor , the third high voltage resistor , the third low-voltage switch , the third medium voltage switch and the third high voltage switch ; The first low voltage resistor The first end of the first medium voltage resistor The first end of the first high-voltage resistor The first end of the second low voltage resistor The first end of the second medium voltage resistor The first end and the second high voltage resistor The first end of each is connected to the output terminal c phase interface; The first low voltage resistor The second end is connected to the first low-voltage switch The first end of the first medium voltage resistor The second end is connected to the first medium voltage switch The first end of the first high voltage resistor The second end is connected to the first high voltage switch The first end of Second low voltage resistor The second end is connected to the second low-voltage switch The first end of the second medium voltage resistor The second end is connected to the second medium voltage switch The first end of the second high voltage resistor The second end is connected to the second high voltage switch The first end of First low voltage switch The second end of the first medium voltage switch The second end of the first high-voltage switch The second end of the third low voltage resistor The first end of the third medium voltage resistor The first end and the third high voltage resistor The first end of each is connected to the output terminal b interface; The third low voltage resistor The second end is connected to the third low-voltage switch The first end of the third medium voltage resistor The second end is connected to the third medium voltage switch The first end of the third high voltage resistor The second end is connected to the third high voltage switch The first end of Second low voltage switch The second end of the second medium voltage switch The second end of the second high-voltage switch The second end of the third low-voltage switch The second end of the third medium voltage switch The second end and the third high voltage switch The second ends of the two terminals are connected to the output terminal a interface; First low voltage switch , Second low voltage switch and the third low voltage switch Use the first linkage switch; First medium voltage switch , Second medium voltage switch and the third medium voltage switch Use the second linkage switch; First high voltage switch , the second high-voltage switch and the third high voltage switch Use a third linkage switch.
4. The transformer ratio test circuit according to claim 3, wherein: A power switch is connected in series to the input end A phase wiring cable, the input end B phase wiring cable, and the input end C phase wiring cable.
5. The transformer ratio test circuit according to claim 1, wherein: The first high-voltage ammeter is connected in series to the input A phase wiring cable. , a second high-voltage ammeter is connected in series to the input B phase wiring cable , a third high-voltage ammeter is connected in series to the C-phase wiring cable at the input end. The first low-voltage ammeter is connected in series to the output a phase wiring cable. , a second low-voltage ammeter is connected in series to the output terminal b phase wiring cable , a second low-voltage ammeter is connected in series to the output phase C wiring cable ; The main controller is respectively connected to the first high voltage ammeter , Second high-voltage ammeter , the third high-voltage ammeter , the first low-voltage ammeter , Second low voltage ammeter and the second low voltage ammeter The cables are connected to each other for collecting current data on the input-end A-phase wiring cable, the input-end B-phase wiring cable, the input-end C-phase wiring cable, the output-end A-phase wiring cable, the output-end B-phase wiring cable, and the output-end C-phase wiring cable.
6. The transformer ratio test circuit according to claim 5, characterized in that: The display screen is also used to display the current data.
7. The transformer ratio test circuit according to claim 1, wherein: The circuit also includes an alarm; The main controller is connected to the alarm and is used to control the alarm to sound an alarm when the monitored current data is overcurrent.
8. A transformer ratio testing device, characterized in that: The device comprises a box and a transformer ratio testing circuit according to any one of claims 1 to 7; The transformer ratio test circuit is integrated in the box; The input A-phase interface, input B-phase interface, input C-phase interface, output A-phase interface, output B-phase interface, output C-phase interface, power supply interface and display screen of the transformer ratio test circuit are all integrated on the box.
9. The transformer ratio test device according to claim 8, characterized in that: When the transformer ratio test circuit includes a first linkage switch, a second linkage switch and a third linkage switch, the first linkage switch, the second linkage switch and the third linkage switch are all integrated on the box.
10. The transformer ratio testing device according to claim 8, characterized in that: When the transformer ratio test circuit includes a power switch, the power switch is integrated on the box.