A high-voltage signal acquisition test mutual inductor comprehensive test device

Abstract

This utility model discloses a comprehensive testing device for high-voltage signal acquisition and testing of instrument transformers, including a chassis, a control unit, a test display unit, a test interface, a power supply unit, and a power supply. The control unit includes a processor. The test display unit includes a phase meter and a ratio / difference meter, which are electrically connected to the processor. The test interface includes a first input terminal, a second input terminal, a first output terminal, a second output terminal, a third output terminal, and a fourth output terminal, which are electrically connected to the processor. The power supply unit includes an isolation transformer and a switching power supply. The primary winding of the isolation transformer is electrically connected to the power supply, and the secondary winding of the isolation transformer is electrically connected to the switching power supply. The processor, phase meter, and ratio / difference meter are all electrically connected to the switching power supply. This utility model has a simple structure and can simultaneously display two parameters, phase and ratio / difference, thus improving production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of instrument transformer technology, and in particular to a comprehensive testing device for high-voltage signal acquisition and testing instrument transformers. Background Technology

[0002] High-voltage instrument transformers are devices used in power systems to convert voltage or current. They transform high voltage and large current into low voltage and small current, providing adaptive signals for measurement, protection, and control systems. High-voltage signal acquisition and testing instrument transformers specifically refer to instrument transformers used in high-voltage environments to acquire and test these converted voltage or current signals.

[0003] The high-voltage signal acquisition and testing transformer consists of a magnetic core, a primary winding, a secondary winding (including two windings), and pins. During production, it is necessary to check the yield of the transformer and pick out defective products. Therefore, it is particularly important to test the electrical performance parameters (phase, ratio difference) of the transformer.

[0004] Currently available instrument transformer testing equipment can only be used to test voltage or phase values ​​individually, and cannot directly test the ratio difference parameter of the instrument transformer. High-voltage signal acquisition and testing of instrument transformers requires that the error between the voltages of the two windings be very small to be considered qualified. At present, the ratio difference value can only be obtained by manual calculation, which is time-consuming and labor-intensive, and greatly reduces production efficiency. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a comprehensive testing device for high voltage signal acquisition and testing transformers that can not only test the phase parameters of high voltage signal acquisition and testing transformers, but also directly test the ratio difference parameters, and has a simple structure and low cost.

[0006] To solve the above-mentioned technical problems, this utility model adopts a comprehensive testing device for high-voltage signal acquisition and testing of instrument transformers, including a chassis, a control unit, a test display unit, a test interface, a power supply unit, and a power supply. The chassis includes a front panel, a right side panel, and a left side panel. The control unit and the power supply unit are installed inside the chassis. The test display unit and the test interface are installed on the front panel. The control unit includes a processor. The test display unit includes a phase meter and a ratio meter, which are electrically connected to the processor. The test interface includes a first input terminal, a second input terminal, a first output terminal, a second output terminal, a third output terminal, and a fourth output terminal, which are electrically connected to the processor. The power supply unit includes an isolation transformer and a switching power supply. The primary winding of the isolation transformer is electrically connected to the power supply, and the secondary winding of the isolation transformer is electrically connected to the switching power supply. The processor, the phase meter, and the ratio meter are electrically connected to the switching power supply.

[0007] In a preferred embodiment of this utility model, the instrument transformer integrated testing device further includes a buzzer, which is installed on the right side panel of the chassis inside the chassis and is electrically connected to the processor.

[0008] In a preferred embodiment of this utility model, heat dissipation holes are provided on the right side plate and the left side plate of the chassis, respectively.

[0009] In a preferred embodiment of this utility model, the instrument transformer integrated testing device further includes a cooling fan, which is installed on the left side panel of the chassis inside the chassis and is electrically connected to the switching power supply.

[0010] In a preferred embodiment of this utility model, the cooling fan is powered by a DC5V switching power supply.

[0011] In a preferred embodiment of this utility model, the processor is a microcontroller, an industrial computer, or a PLC controller.

[0012] In a preferred embodiment of this utility model, the phase meter and the ratio difference meter are LED digital display meters or LCD digital display meters.

[0013] In a preferred embodiment of this utility model, the processor is powered by a DC24V switching power supply, and the phase meter and the differential meter are both powered by a DC5V switching power supply.

[0014] In a preferred embodiment of this utility model, the processor is powered by a DC24V switching power supply, and the phase meter and the differential meter are both powered by a DC5V switching power supply.

[0015] In a preferred embodiment of this utility model, the isolation transformer is a 220V-220V isolation transformer, and the power supply is a 220V AC power supply.

[0016] By adopting the above structure, this utility model has the following beneficial effects:

[0017] The integrated test device for high-voltage signal acquisition and test of mutual inductors of the present utility model includes a chassis, a control unit, a test display unit, a test interface, a power supply unit and a power supply. The chassis includes a chassis panel, a right chassis side plate and a left chassis side plate. The control unit and the power supply unit are installed inside the chassis. The test display unit and the test interface are installed on the chassis panel. The control unit includes a processor. The test display unit includes a phase meter and a ratio difference meter. The phase meter and the ratio difference meter are respectively electrically connected to the processor. The test interface includes a first input terminal, a second input terminal, a first output terminal, a second output terminal, a third output terminal and a fourth output terminal. The first input terminal, the second input terminal, the first output terminal, the second output terminal, the third output terminal and the fourth output terminal are respectively electrically connected to the processor. The power supply unit includes an isolation transformer and a switching power supply. The primary winding of the isolation transformer is electrically connected to the power supply. The secondary winding of the isolation transformer is electrically connected to the switching power supply. The processor, the phase meter and the ratio difference meter are respectively electrically connected to the switching power supply. When the present utility model is in test, the two pins of the primary winding of the high-voltage signal acquisition and test mutual inductor are respectively connected to the first input terminal and the second input terminal. The two pins of one winding of the secondary winding are respectively connected to the first output terminal and the second output terminal. The two pins of the other winding of the secondary winding are respectively connected to the third output terminal and the fourth output terminal. The power supply is switched on, and the phase meter and the ratio difference meter can respectively display the phase parameter and the ratio difference parameter. In this way, the present utility model can obtain two important parameters of phase and ratio difference simultaneously in one test, and saves the time for manual calculation of the ratio difference value, greatly improving the production efficiency. The structure of the present utility model is also very simple and the cost is relatively low, ensuring that the performance indicators of the high-voltage signal acquisition and test mutual inductor products meet the requirements.

[0018] The integrated test device for mutual inductors of the present utility model further includes a buzzer. The buzzer is installed on the right chassis side plate inside the chassis. The buzzer is electrically connected to the processor. In this way, when the product is qualified, the buzzer will emit a sound, and the operator can judge whether the product is qualified only by listening to the sound during the test.

[0019] Heat dissipation holes are respectively provided on the right chassis side plate and the left chassis side plate of the present utility model. In this way, the ventilation and heat dissipation of the present utility model are ensured, making the present utility model work stably.

[0020] The integrated test device for mutual inductors of the present utility model further includes a heat dissipation fan. The heat dissipation fan is installed on the left chassis side plate inside the chassis. The heat dissipation fan is electrically connected to the switching power supply. In this way, the ventilation and heat dissipation function of the utility model is further improved.

[0021] The heat dissipation fan of the present utility model is powered by DC5V of the switching power supply. In this way, it is relatively safe and reliable.

[0022] The processor described in this invention is a microcontroller, an industrial computer, or a PLC controller. This allows for the selection of a suitable processor based on the specific circumstances.

[0023] The phase meter and the ratio difference meter of this invention use LED digital displays or LCD digital displays. This makes the display of test parameters more intuitive and accurate.

[0024] The processor of this invention is powered by a DC 24V switching power supply, while the phase meter and the differential meter are both powered by a DC 5V switching power supply. This makes it convenient and practical.

[0025] The isolation transformer of this invention is a 220V-220V isolation transformer, and the power supply is a 220V AC power supply. Thus, the use of a 220V-220V isolation transformer further ensures the safety and reliability of this equipment; the use of 220V AC mains power is convenient and readily available. Attached Figure Description

[0026] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the circuit principle structure of the high-voltage signal acquisition and testing instrument transformer integrated testing device of this utility model.

[0028] Figure 2 This is a schematic diagram of the internal structure of the chassis of this utility model.

[0029] Figure 3 This is a schematic diagram of the chassis panel structure of this utility model.

[0030] Figure 4 This is a three-dimensional schematic diagram of the overall structure of this utility model. Detailed Implementation

[0031] See Figure 1 , Figure 2 , Figure 3 and Figure 4The high-voltage signal acquisition and testing transformer integrated testing device shown includes a chassis 100, a control unit, a test display unit, a test interface, a power supply unit, and a power supply 101. The chassis 100 includes a chassis front panel 102, a right side panel 103, and a left side panel 104. The control unit and power supply unit are installed inside the chassis 100. The test display unit and test interface are installed on the chassis front panel 102. The control unit includes a processor 1. The test display unit includes a phase meter 2 and a ratio meter 3, which are electrically connected to the processor 1. The test interface... The power supply unit includes a first input terminal 4, a second input terminal 5, a first output terminal 6, a second output terminal 7, a third output terminal 8, and a fourth output terminal 9. The first input terminal 4, the second input terminal 5, the first output terminal 6, the second output terminal 7, the third output terminal 8, and the fourth output terminal 9 are electrically connected to the processor 1. The power supply unit includes an isolation transformer 10 and a switching power supply 11. The primary winding of the isolation transformer 10 is electrically connected to the power supply 101, and the secondary winding of the isolation transformer 10 is electrically connected to the switching power supply 11. The processor 1, the phase meter 2, and the ratio meter 3 are electrically connected to the switching power supply 11.

[0032] As a preferred embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the integrated testing device for the current transformer also includes a buzzer 12, which is installed on the right side panel 103 of the chassis 100 and is electrically connected to the processor 1.

[0033] As a preferred embodiment of this utility model, such as Figure 2 and Figure 4 As shown, heat dissipation holes 105 are provided on the right side panel 103 and the left side panel 104 of the chassis, respectively.

[0034] As a preferred embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the instrument transformer integrated testing device also includes a cooling fan 13, which is installed on the left side panel 104 of the chassis 100 and is electrically connected to the switching power supply 11.

[0035] As a preferred embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the cooling fan 13 is powered by the DC 5V of the switching power supply 11.

[0036] As a preferred embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the processor 1 is a microcontroller, an industrial computer, or a PLC controller.

[0037] As a preferred embodiment of the present utility model, as shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 , the phase meter 2 and the ratio difference meter 3 adopt LED digital display meters or LCD digital display meters.

[0038] As a preferred embodiment of the present utility model, as shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 , the processor 1 is powered by DC24V of the switching power supply 11, and the phase meter 2 and the ratio difference meter 3 are both powered by DC5V of the switching power supply 11.

[0039] As a preferred embodiment of the present utility model, as shown in Figure 1 and Figure 2 , the isolation transformer 10 adopts a 220V - 220V isolation transformer, and the power supply 101 adopts a 220V AC power supply.

[0040] In practical applications, the phase meter 2 of the present utility model adopts a two - digit digital display meter. When the test shows 00, it means no signal; when it shows - 1, it means the phase is opposite; when it shows 1, it means the phase is accurate. When measuring the phase, the voltage signals of the primary side and the secondary side of the mutual inductor are synchronously collected, and the phase difference between the two is calculated by the processor 1 through an algorithm; the ratio difference meter 3 adopts a six - digit digital display meter. When the first digit shows -, it means negative, and when the first digit does not show, it means positive. When the test shows a value from - 0.0004 to 0.0004, it is qualified. The ratio difference value of the ratio difference meter 3 is automatically calculated by the processor 1, and the calculation formula is V 8﹣9 / V 6﹣7 - 1.1541, (V 8﹣9 is the voltage between the third output terminal 8 and the fourth output terminal 9, V 6﹣7 is the voltage between the first output terminal 6 and the second output terminal 7, / represents the ratio).

[0041] In testing the high-voltage signal acquisition and testing transformer, this utility model first connects the two pins of the primary winding of the transformer to the first input terminal 4 and the second input terminal 5, respectively. Then, the two pins of one winding of the secondary winding are connected to the first output terminal 6 and the second output terminal 7, respectively. Finally, the two pins of the other winding of the secondary winding are connected to the third output terminal 8 and the fourth output terminal 9, respectively. Then, the power supply 101 is turned on. The phase meter 2 and the ratio difference meter 3 then display the phase parameter and the ratio difference parameter, respectively. A reading of 1 on the phase meter 2 indicates a pass, and a reading of -0.0004 to 0.0004 on the ratio difference meter 3 indicates a pass. When both the phase meter 2 and the ratio difference meter 3 show a pass, the buzzer 12 sounds. If either the phase meter 2 or the ratio difference meter 3 shows a fail, the buzzer 12 does not sound.

[0042] After testing, this utility model can quickly detect products during operation and simultaneously display two parameter values: phase and ratio difference. The ratio difference accuracy can reach ±0.0001, saving the time of manual calculation of the ratio difference value, greatly improving the product yield, and significantly increasing production efficiency. Moreover, it has a simple structure and low cost, ensuring the performance indicators of high voltage signal acquisition and testing transformer products, and has achieved good practical results.

Claims

1. A high-voltage signal acquisition test mutual inductor comprehensive test device, comprising a cabinet (100), a control unit, a test display unit, a test interface, a power supply unit and a power supply (101), the cabinet (100) comprises a cabinet panel (102), a cabinet right side plate (103) and a cabinet left side plate (104), the control unit and the power supply unit are installed in the cabinet (100), and the test display unit and the test interface are installed on the cabinet panel (102), characterized in that: The control unit includes a processor (1), the test display unit includes a phase table (2) and a ratio difference table (3), the phase table (2) and the ratio difference table (3) are electrically connected to the processor (1) respectively, the test interface includes a first input terminal (4), a second input terminal (5), a first output terminal (6), a second output terminal (7), a third output terminal (8) and a fourth output terminal (9), the first input terminal (4), the second input terminal (5), the first output terminal (6), the second output terminal (7), the third output terminal (8) and the fourth output terminal (9) are electrically connected to the processor (1) respectively, the power supply unit includes an isolation transformer (10) and a switching power supply (11), the primary winding of the isolation transformer (10) is electrically connected to the power supply (101), the secondary winding of the isolation transformer (10) is electrically connected to the switching power supply (11), and the processor (1), the phase table (2) and the ratio difference table (3) are electrically connected to the switching power supply (11) respectively. ​ 2. The high-voltage signal acquisition and testing instrument transformer integrated testing device according to claim 1, characterized in that: The instrument transformer integrated testing device also includes a buzzer (12), which is installed on the right side panel (103) of the chassis (100) and is electrically connected to the processor (1).

3. The high-voltage signal acquisition and testing instrument transformer integrated testing device according to claim 1, characterized in that: The right side panel (103) and the left side panel (104) of the chassis are respectively provided with heat dissipation holes (105).

4. The integrated testing device for high-voltage signal acquisition and testing transformers according to claim 1, characterized in that: The instrument transformer integrated testing device also includes a cooling fan (13), which is installed on the left side panel (104) of the chassis (100) and is electrically connected to the switching power supply (11).

5. The integrated testing device for high-voltage signal acquisition and testing transformers according to claim 4, characterized in that: The cooling fan (13) is powered by DC5V from the switching power supply (11).

6. The integrated testing device for high-voltage signal acquisition and testing transformers according to claim 1, characterized in that: The processor (1) is a single-chip microcomputer, an industrial control computer, or a PLC controller.

7. The integrated testing device for high-voltage signal acquisition and testing transformers according to claim 1, characterized in that: The phase table (2) and the ratio difference table (3) are LED digital displays or LCD digital displays.

8. The integrated testing device for high-voltage signal acquisition and testing transformers according to claim 1, characterized in that: The processor (1) is powered by DC24V from the switching power supply (11), and the phase meter (2) and the ratio meter (3) are both powered by DC5V from the switching power supply (11).

9. The integrated testing device for high-voltage signal acquisition and testing transformers according to claim 1, characterized in that: The isolation transformer (10) is a 220V-220V isolation transformer, and the power supply (101) is a 220V AC power supply.

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