Checking device for voltmeter of subway power supply system

Abstract

The utility model discloses a checking device for a voltmeter of a subway power supply system, which comprises a remote controller, a remote control receiving module, a duty ratio controller, an operating handle, a rectification power supply module, an AC220V power supply module, a potentiometer, an intelligent signal generating device, a change-over switch, a resettable fuse module, a direct-current power supply module, a signal isolating and amplifying module and a tested voltmeter. A signal conversion display device and an oscilloscope; the beneficial effects of the utility model are that the verification result of the voltmeter is more comprehensive and more accurate, the safety is higher, and whether the voltmeter is accurate can be verified very conveniently and rapidly.

Description

Technical Field

[0001] The utility model relates to the technical fields of railways, subways and electromechanical systems, and in particular to a calibrating device for a voltmeter of a subway power supply system. Background Art

[0002] The voltmeters in the existing subway power supply system may occasionally display inaccurate faults. Therefore, it is necessary to independently and quickly check whether the voltmeters in the subway power supply system are faulty. Currently, there is a lack of devices on the market that can quickly check the voltmeters in the subway power supply system. Utility Model Content

[0003] In order to overcome the problems of occasional inaccurate display and other fault phenomena of the voltmeter of the traditional subway power supply system, the utility model provides a calibration device for the voltmeter of the subway power supply system. When the voltmeter is suspected to be faulty, the subway company can independently detect the voltmeter of the subway power supply system and send the faulty voltmeter to an external repair in time.

[0004] The technical solution adopted by the utility model to achieve the above-mentioned purpose is: including a remote control, a remote control receiving module, a duty cycle controller, an operating handle, a rectifier power module, an AC220V power module, a potentiometer, an intelligent signal generating device, a conversion switch, a self-recovering fuse module, a DC power module, a signal isolation and amplification module, a measured voltmeter, a signal conversion display device and an oscilloscope;

[0005] The remote controller is connected to the remote control receiving module and sends a signal to the remote control receiving module; the remote control receiving module is electrically connected to the duty cycle controller, and the remote control receiving module controls the duty cycle controller; the duty cycle controller is electrically connected to the operating handle, and the duty cycle controller sends a shift signal to the operating handle;

[0006] The AC220V power module is connected to the rectifier power module to supply power to the rectifier power module; the rectifier power module is electrically connected to the operating handle, and the rectifier power module supplies power to the operating handle; the operating handle is electrically connected to the intelligent signal generating device, and the operating handle sends a signal to the intelligent signal generating device;

[0007] The DC power supply module is connected to the resettable fuse, and the DC power supply module supplies power to the resettable fuse; the resettable fuse is electrically connected to the conversion switch, and the resettable fuse supplies power to the conversion switch; the conversion switch is electrically connected to the intelligent signal generating device, and the conversion switch controls and supplies power to the intelligent signal generating device; the potentiometer is electrically connected to the intelligent signal generating device, and the potentiometer inputs an analog voltage signal to the intelligent signal generating device;

[0008] The intelligent signal generating device is electrically connected to the signal isolation and amplification module, and the intelligent signal generating device sends a signal to the signal isolation and amplification module; the signal isolation and amplification module is directly electrically connected to the voltmeter under test, the signal conversion and display device, and the oscilloscope respectively, the voltmeter under test, the signal conversion and display device, and the oscilloscope are connected in parallel with each other, and the signal isolation and amplification module sends an analog voltage signal to the voltmeter under test, the signal conversion and display device, and the oscilloscope simultaneously; the signal conversion and display device displays the theoretical voltage value of the voltmeter under test, and the oscilloscope displays the ripple of the above-mentioned analog voltage signal.

[0009] The operating handle outputs a continuous voltage meter input signal to the intelligent signal generating device to control the amplitude of the output signal of the intelligent signal generating device; the user indirectly applies an analog voltage signal to the intelligent signal generating device for fine adjustment by operating the potentiometer.

[0010] The signal type of the voltmeter input signal is an analog voltage signal.

[0011] The user can manually determine whether the display of the tested voltmeter is accurate and whether the deviation is too large by checking the theoretical voltage value of the tested voltmeter displayed by the signal conversion display device and the actual voltage value displayed by the tested voltmeter and comparing the difference between the two. If the deviation is too large, it means that the error of the tested voltmeter is too large.

[0012] The beneficial effects of the utility model are as follows:

[0013] The calibration device of the voltmeter of the subway power supply system cleverly introduces an intelligent signal generating device to intelligently simulate the generation of voltmeter input signals, providing accurate voltmeter input signals and more comprehensive calibration of the voltmeter under test.

[0014] The calibration device of the subway power supply system voltmeter cleverly uses the signal isolation and amplification module to effectively electrically isolate the voltmeter signal input channel from the external signal channel, effectively avoiding external error signal interference, causing external abnormal high-voltage signals to enter the voltmeter signal input channel, and effectively avoiding damage to the voltmeter under test. This method is safer than the traditional voltmeter calibration method.

[0015] The voltmeter calibration device of the subway power supply system cleverly uses a self-recovery fuse to effectively prevent the voltmeter under test and the power supply from being damaged when the circuit is short-circuited or other abnormalities occur. This method is safer than the traditional voltmeter calibration method.

[0016] The calibration device of the subway power supply system voltmeter cleverly uses an oscilloscope to visually display the waveform changes of the input signal of the voltmeter under test. It is vivid and intuitive, and it is easier to find abnormal conditions of the voltmeter input signal during the calibration process. Compared with the traditional voltmeter calibration method, this method monitors the calibration signal of the voltmeter under test more comprehensively and has more accurate actual calibration results.

[0017] The calibration device of the voltmeter of the subway power supply system cleverly utilizes the introduction of a signal conversion display device to transform the theoretical value corresponding to the input signal of the voltmeter under test, which can extremely conveniently and quickly verify whether the voltmeter under test is accurate.

[0018] The calibration device of the voltmeter of the subway power supply system cleverly uses a remote controller and a remote control receiving module to remotely and quickly adjust the input signal of the voltmeter under test, and can extremely conveniently and quickly verify whether the voltmeter under test is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the design principle block diagram of the voltage meter calibration device of the subway power supply system; DETAILED DESCRIPTION

[0020] like Figure 1 As shown, the calibration device of the voltage meter of the subway power supply system includes a remote controller, a remote control receiving module, a duty cycle controller, an operating handle, a rectifier power module, an AC220V power module, a potentiometer, an intelligent signal generating device, a switching switch, a self-recovery fuse module, a DC power module, a signal isolation amplifier module, a voltage meter under test, a signal conversion display device and an oscilloscope;

[0021] The remote controller is connected to the remote control receiving module and sends a signal to the remote control receiving module; the remote control receiving module is electrically connected to the duty cycle controller, and the remote control receiving module controls the duty cycle controller; the duty cycle controller is electrically connected to the operating handle, and the duty cycle controller sends a shift signal to the operating handle;

[0022] The AC 320V power supply module is connected to the rectifier power supply module to supply power to the rectifier power supply module; the rectifier power supply module is electrically connected to the operating handle, and the rectifier power supply module supplies power to the operating handle; the operating handle is electrically connected to the intelligent signal generating device, and the operating handle sends a signal to the intelligent signal generating device;

[0023] The DC power supply module is connected to the resettable fuse, and the DC power supply module supplies power to the resettable fuse; the resettable fuse is electrically connected to the conversion switch, and the resettable fuse supplies power to the conversion switch; the conversion switch is electrically connected to the intelligent signal generating device, and the conversion switch controls and supplies power to the intelligent signal generating device; the potentiometer is electrically connected to the intelligent signal generating device, and the potentiometer inputs an analog voltage signal to the intelligent signal generating device;

[0024] The intelligent signal generating device is electrically connected to the signal isolation and amplification module, and the intelligent signal generating device sends a signal to the signal isolation and amplification module; the signal isolation and amplification module is directly electrically connected to the voltmeter under test, the signal conversion and display device, and the oscilloscope respectively, the voltmeter under test, the signal conversion and display device, and the oscilloscope are connected in parallel with each other, and the signal isolation and amplification module sends an analog voltage signal to the voltmeter under test, the signal conversion and display device, and the oscilloscope simultaneously; the signal conversion and display device displays the theoretical voltage value of the voltmeter under test, and the oscilloscope displays the ripple of the above-mentioned analog voltage signal.

[0025] The operating handle outputs a continuous voltage meter input signal to the intelligent signal generating device to control the amplitude of the output signal of the intelligent signal generating device; the user indirectly applies an analog voltage signal to the intelligent signal generating device for fine adjustment by operating the potentiometer.

[0026] The signal type of the voltmeter input signal is an analog voltage signal.

[0027] The user can manually determine whether the display of the tested voltmeter is accurate and whether the deviation is too large by checking the theoretical voltage value of the tested voltmeter displayed by the signal conversion display device and the actual voltage value displayed by the tested voltmeter and comparing the difference between the two. If the deviation is too large, it means that the error of the tested voltmeter is too large.

[0028] 1. Analog voltage signal: Voltage signal types are divided into two categories: digital voltage signal and analog voltage signal. Digital voltage signal refers to discrete voltage signal, and analog voltage signal refers to continuous voltage signal. For the voltmeter input signal type, it is an analog voltage signal. In other words, in this device: the voltage input signal is an analog voltage signal.

[0029] 2. Theoretical voltage value and actual voltage value: The actual voltage value displayed by the "tested voltmeter" needs to be compared with a standard device to determine whether this value is accurate. This standard device is the "signal conversion display device". The "signal conversion display device" displays the theoretical voltage value. This theoretical voltage value is the voltage value that the "tested voltmeter" should display. If the actual voltage value displayed by the "tested voltmeter" deviates too much from the above value, it means that the voltmeter has too large an error.

Claims

1. A voltage meter calibration device for a subway power supply system, characterized in that: It includes a remote control, a remote control receiving module, a duty cycle controller, an operating handle, a rectifier power module, an AC220V power module, a potentiometer, an intelligent signal generating device, a conversion switch, a resettable fuse module, a DC power module, a signal isolation amplification module, a voltage meter under test, a signal conversion display device and an oscilloscope; the remote control is connected to the remote control receiving module, the remote control receiving module is electrically connected to the duty cycle controller, the duty cycle controller is electrically connected to the operating handle, the AC220V power module is connected to the rectifier power module, the rectifier power module is electrically connected to the operating handle, the operating handle is electrically connected to the intelligent signal generating device, the DC power module is connected to the resettable fuse, the resettable fuse is electrically connected to the conversion switch, the conversion switch is electrically connected to the intelligent signal generating device, the potentiometer is electrically connected to the intelligent signal generating device, the intelligent signal generating device is electrically connected to the signal isolation amplification module, and the signal isolation amplification module is directly electrically connected to the voltage meter under test, the signal conversion display device and the oscilloscope respectively.

2. The calibrating device for the voltage meter of the subway power supply system according to claim 1 is characterized in that: The voltmeter under test, the signal conversion display device and the oscilloscope are connected in parallel with each other, and the signal isolation and amplification module sends an analog voltage signal to the voltmeter under test, the signal conversion display device and the oscilloscope simultaneously; the signal conversion display device displays the theoretical voltage value of the voltmeter under test, and the oscilloscope displays the ripple of the analog voltage signal.

3. The calibrating device for the voltage meter of the subway power supply system according to claim 1 is characterized in that: The operating handle outputs a continuous voltage meter input signal to the intelligent signal generating device to control the amplitude of the output signal of the intelligent signal generating device; the user indirectly applies an analog voltage signal to the intelligent signal generating device for fine adjustment by operating the potentiometer.

4. The calibrating device for the voltage meter of the subway power supply system according to claim 3 is characterized in that: The signal type of the voltmeter input signal is an analog voltage signal.

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