A digital display test transformer control box

Abstract

The present invention relates to a digital display test transformer control box, comprising a box body and a circuit located inside the box body, wherein the internal circuit comprises a contact voltage regulator, a current transformer, a transformer, an overcurrent protection circuit, a control circuit, a measuring circuit, a data processing module, a display, a keyboard, etc.; wherein the contact voltage regulator is connected to the current transformer, the transformer, and a switch; the control circuit is connected to the overcurrent protection circuit, the keyboard, and the measuring circuit; and the measuring circuit is connected to the overcurrent protection circuit, the control circuit, and the data processing module. The box body is provided with a voltmeter, an ammeter, a timing setting, a current setting, a power socket, a power switch, a status indicator light, a wiring terminal, and a control button. The control box uses a digital display, and the loss of the digital signal is almost zero during the fidelity and transmission of the signal, so that the data display is more accurate. It has the characteristics of being easy to use, having superior performance, being safe and reliable to use, and being easy to move.

Description

Technical Field

[0001] The invention relates to a mainframe of high-voltage test equipment, in particular to a digital display test transformer control box. Background Art

[0002] As the host of high-voltage test equipment, the test transformer control box is used for power frequency withstand voltage tests on electrical products, equipment, components and insulating materials to assess the insulation level of the test products, and can detect local defects of the test products early and measure the ability of the test products to withstand internal and external overvoltages. The existing test transformer control box voltmeter and ammeter work on the electromagnetic principle, drive the pointer to move, and display the value by the position where the pointer stays on the panel. They are easily affected by magnetic fields, electromagnetic interference, etc., resulting in a large error between the displayed value and the actual value. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a digital display test transformer control box. During the signal fidelity and transmission process, the loss of digital signals is almost zero. Therefore, the instrument can still ensure normal testing and test accuracy in environments such as magnetic fields and electromagnetic interference.

[0004] The technical solution adopted by the present invention is:

[0005] The digital display test transformer control box includes a box body and a circuit located inside the box body, wherein the internal circuit includes a contact voltage regulator, a current transformer, a transformer, an overcurrent protection circuit, a control circuit, a measurement circuit, a data processing module, a display, a keyboard, etc.; wherein the contact voltage regulator is connected to the current transformer, the transformer, and the switch; the control circuit is connected to the overcurrent protection circuit, the keyboard, and the measurement circuit; and the measurement circuit is connected to the overcurrent protection circuit, the control circuit, and the data processing module.

[0006] The box body is provided with a voltmeter, an ammeter, a timer setting, a current setting, a power socket, a power switch, a status indicator light, a wiring terminal, and a control button.

[0007] The voltmeter and ammeter use digital displays, sample the signals, convert the measured values ​​into digital form using an analog / digital converter, and display the measurement results in digital form. During the signal fidelity and transmission process, the loss of digital signals is almost zero, and the digital display has a single-mode loop structure, so the data display is more accurate.

[0008] The timing setting is controlled by a new type of time relay, and the stop time can be set arbitrarily without manual intervention, thereby improving the reliability of the equipment.

[0009] The current setting adopts a new type of current relay, which is more accurate and reliable, ensuring the safety of people and equipment.

[0010] The status indicator light reminds the operator to pay attention to safety at all times during the test.

[0011] The overcurrent protection circuit is composed of a current transformer, an overcurrent relay, a time relay and a signal relay.

[0012] The keyboard adopts light-touch panel keys, and all settings of the user can be input through the keys.

[0013] The control circuit is a single chip microcomputer that uses input and output signals to control the controlled device through a driving circuit.

[0014] The measuring circuit samples and analyzes the electrical signals and data in the test product, performs operations and comparisons with the feedback signals and data, and then the integrated operational amplifier in the data processing module calculates the real and accurate measurement data.

[0015] The beneficial effects of the present invention are:

[0016] 1. The test transformer control box uses a digital display. In the process of signal fidelity and transmission, the loss of digital signals is almost zero. The digital display has a single-mode loop structure, so the data display is more accurate.

[0017] 2. For large capacity test products, the voltage and current can be directly read through the digital display.

[0018] 3. During the voltage boost or withstand test, if overcurrent such as short circuit, flashover, breakdown occurs, the overcurrent protection circuit can effectively protect the instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention discloses a working principle diagram of a digital display test transformer control box.

[0020] Figure 2 The invention discloses a circuit structure diagram of a digital display test transformer control box.

[0021] Figure 3 The present invention is a schematic diagram of the box structure of a digital display test transformer control box.

[0022] Among them, 1 box; 2 switch; 3 high voltage display; 4 low voltage current display; 5 power supply; 6 zero position; 7 power supply; 8 alarm; 9 PE; 10 instrument port; 11 output port; 12 power socket; 13 start; 14 stop; 15 timing; 16 overcurrent protection; 17 voltage regulator handle; 18 current setting; 19 timing setting. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below in conjunction with specific examples with reference to the accompanying drawings.

[0024] like Figure 1 and Figure 2 The internal circuit of a digital display test transformer control box shown includes: a contact voltage regulator, a current transformer, a transformer, an overcurrent protection circuit, a control circuit, a measurement circuit, a data processing module, a display, a keyboard, etc. The contact voltage regulator is connected to the current transformer, the transformer, and the switch; the control circuit is connected to the overcurrent protection circuit, the keyboard, and the measurement circuit; and the measurement circuit is connected to the overcurrent protection circuit, the control circuit, and the data processing module.

[0025] like Figure 3 As shown, the power socket 12 is connected to the power supply, the switch 2 is closed, the power indicator 5 is on, the timer setting 19 sets the time, the voltage regulator handle 17 is rotated to the zero position, the zero switch is closed, the zero indicator 6 is on, the start button 13 is pressed, the contactor is closed, the voltage regulator is powered, and the power supply 7 indicator is on; rotate the voltage regulator handle 17 clockwise, and when it rises to the required high voltage value, stop rotating the voltage regulator handle 17 and press the timing button 15 in time. When the set time is reached, the box 1 (control box) emits an audible and visual alarm. Rotate the voltage regulator handle 17 in the opposite direction until the voltage regulator returns to zero, release the timing button 15, and cut off the switch 2.

[0026] The voltmeter and ammeter use digital displays. In the process of signal fidelity and transmission, the loss of digital signals is almost zero, and the digital display has a single-mode loop structure, so the data display is more accurate. The overcurrent protection circuit is composed of a current transformer, an overcurrent relay, a time relay, and a signal relay. The keyboard uses touch-type panel buttons, and all functions can be set by buttons. The control circuit controls the controlled device through the drive circuit for the input and output signals of the single-chip microcomputer. The measurement circuit samples and analyzes the electrical signals and data in the test product, calculates and compares them with the feedback signals and data, and then the integrated operational amplifier in the data processing module calculates the real and accurate measurement data.

[0027] The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment. As long as the technical solutions for achieving the purpose of the present invention by basically the same means are achieved, they all fall within the protection scope of the present invention.

Claims

1. A digital display test transformer control box, characterized in that: It includes a box and a circuit inside the box, wherein the internal circuit includes a contact voltage regulator, a current transformer, a transformer, an overcurrent protection circuit, a control circuit, a measurement circuit, a data processing module, a display, a keyboard, etc.; wherein the contact voltage regulator is connected to the current transformer, the transformer, and the switch; the control circuit is connected to the overcurrent protection circuit, the keyboard, and the measurement circuit; and the measurement circuit is connected to the overcurrent protection circuit, the control circuit, and the data processing module; The box is equipped with a voltmeter, an ammeter, a timing setting, a current setting, a power socket, a power switch, a status indicator light, a wiring terminal, and a control button; The measurement circuit samples and analyzes the electrical signals and data in the test product, performs operations and comparisons with the feedback signals and data, and then the integrated operational amplifier in the data processing module calculates the real and accurate measurement data; The voltmeter and ammeter use digital displays. By sampling the signal, the measured value is converted into digital form with an analog / digital converter and the measurement result is displayed in digital form. In the process of signal fidelity and transmission, the loss of digital signal is almost zero, and the digital display has a single-mode loop structure, so the data display is more accurate.

2. A digital display test transformer control box according to claim 1, characterized in that: The overcurrent protection circuit is composed of a current transformer, an overcurrent relay, a time relay and a signal relay.

3. A digital display test transformer control box according to claim 1, characterized in that: The keyboard uses touch panel keys, and all user settings can be entered through the keys.

4. A digital display test transformer control box according to claim 1, characterized in that: The control circuit is a single-chip microcomputer that inputs and outputs signals to control the controlled device through a drive circuit.

5. A digital display test transformer control box according to claim 2, characterized in that: The timing setting is controlled by a new type of time relay, and the stop time can be set arbitrarily without manual intervention, which improves the reliability of the equipment.

6. A digital display test transformer control box according to claim 2, characterized in that: The current setting adopts a new type of current relay, which is more accurate and reliable, ensuring the safety of people and equipment.

7. A digital display test transformer control box according to claim 2, characterized in that: The status indicator light reminds the operator to pay attention to safety at all times during the test.

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