CN115032444A - High-voltage isolation detection device and method - Google Patents

Abstract

The invention relates to the technical field of high voltage detection, and discloses a high voltage isolation detection device and a high voltage isolation detection method.

Description

High-voltage isolation detection device and method

Technical Field

The invention relates to the technical field of high-voltage detection, in particular to a high-voltage isolation detection device and method.

Background

Because the maintenance process of the power supply equipment inevitably has electric shock safety risks, the electroscope is widely used as a direct means for detecting whether the power supply equipment is electrified on site. However, in the case of a conventional safety accident, it can be found that there is a personal casualty accident caused by a vicious misoperation due to the wrong use of the electroscope by a user.

At present, when a common high-voltage acousto-optic alarm electroscope is used, self-checking alarm is similar to or the same as that of a low-voltage acousto-optic alarm electroscope, and obvious difference is difficult to be formed between the self-checking alarm and the low-voltage acousto-optic alarm electroscope effectively, so that the accuracy of high-voltage early warning is reduced.

Disclosure of Invention

The invention provides a high-voltage isolation detection device and method, which solve the technical problem of low accuracy of high-voltage early warning.

In view of the above, the first aspect of the present invention provides a high voltage isolation detection apparatus, comprising: the device comprises a voltage sampling module, a signal processing module, a main control module and an early warning module;

the voltage sampling module is used for sampling voltage of a tested circuit to obtain a voltage signal, conditioning the voltage signal to obtain a first conditioning voltage signal, and sending the first conditioning voltage signal to the signal processing module;

the signal processing module comprises a rectifying module, an amplifying module, a peak filtering module and a direct current conditioning module; the rectification module is used for rectifying the first conditioning voltage signal to obtain a rectified voltage signal; the amplifying module is used for amplifying the rectified voltage signal to obtain an amplified voltage signal; the peak filtering module is used for carrying out peak filtering processing on the amplified voltage signal to obtain a filtering signal; the direct current conditioning module is used for conditioning the voltage of the filtering signal, outputting a second conditioning voltage signal with a preset voltage value and sending the second conditioning voltage signal to the main control module;

the main control module is used for performing analog-to-digital conversion on the second conditioning voltage signal to obtain a digital signal, performing inverse operation on the digital signal based on a linear regression algorithm to obtain a voltage amplitude corresponding to the second conditioning voltage signal, and comparing the voltage amplitude with a preset voltage threshold value to judge whether the voltage signal of the circuit to be detected is a high-voltage signal, if the voltage signal of the circuit to be detected is not the high-voltage signal, generating a low-voltage early warning signal and sending the low-voltage early warning signal to the early warning module;

the early warning module is used for giving an alarm according to the low-voltage early warning signal.

Preferably, the voltage sampling module comprises a power taking terminal and a sampling conditioning circuit;

the electricity taking terminal comprises a conductive copper pipe, a conductive threaded rod and an insulating layer, wherein the conductive copper pipe is of a cylindrical structure with one end open, the conductive threaded rod penetrates through the conductive copper pipe, the insulating layer is arranged on the inner side of the conductive copper pipe, the conductive copper pipe and the conductive threaded rod form a capacitive coupling structure, the conductive copper pipe is used for being in contact with a circuit to be tested, and the sampling conditioning circuit is electrically connected with the conductive threaded rod.

Preferably, the signal processing module further comprises: and the resistance current-limiting circuit is respectively electrically connected with the voltage sampling module and the rectifying module and is used for carrying out current-limiting processing on the voltage signal.

Preferably, the rectifying module comprises a first diode and a triode, and the first diode is connected with the triode in parallel.

Preferably, the peak filtering module includes a second diode, a resistor and a capacitor connected in series in sequence.

Preferably, the apparatus further comprises: the power supply module is electrically connected with the voltage stabilizing module, and the voltage stabilizing module is electrically connected with the main control module.

Preferably, the apparatus further comprises: and the display module is in communication connection with the main control module through an IIC protocol.

Preferably, the apparatus further comprises: the voice broadcasting module is in communication connection with the main control module.

Preferably, the early warning module adopts a warning lamp.

In a second aspect, the present invention further provides a detection method based on the above high voltage isolation detection apparatus, including the following steps:

carrying out voltage sampling on a tested circuit to obtain a voltage signal, and carrying out signal conditioning on the voltage signal to obtain a first conditioning voltage signal;

rectifying the first conditioning voltage signal to obtain a rectified voltage signal;

amplifying the rectified voltage signal to obtain an amplified voltage signal;

carrying out peak value filtering processing on the amplified voltage signal to obtain a filtering signal;

voltage conditioning is carried out on the filtering signal, and a second conditioning voltage signal with a preset voltage value is output;

performing analog-to-digital conversion on the second conditioning voltage signal to obtain a digital signal, and performing inverse operation on the digital signal based on a linear regression algorithm to obtain a voltage amplitude corresponding to the second conditioning voltage signal;

and comparing the voltage amplitude with a preset voltage threshold value to judge whether the voltage signal of the tested circuit is a high-voltage signal, and if the voltage signal of the tested circuit is not the high-voltage signal, generating a low-voltage early warning signal to alarm.

According to the technical scheme, the invention has the following advantages:

the invention samples the voltage of the circuit to be detected, conditions the voltage signal, rectifies, amplifies, filters the peak value, conditions the processed voltage with direct current, outputs the conditioned voltage signal with a preset voltage value, performs analog-to-digital conversion on the conditioned voltage signal, performs inverse operation on the digital signal based on a linear regression algorithm to obtain a corresponding voltage amplitude, compares the voltage amplitude with a preset voltage threshold value to judge whether the voltage signal of the circuit to be detected is a high-voltage signal, and generates a low-voltage early warning signal to warn if the voltage signal of the circuit to be detected is not the high-voltage signal, thereby improving the accuracy of high-voltage early warning.

Drawings

Fig. 1 is a schematic structural diagram of a high voltage isolation detection apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a power-taking terminal according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a sampling conditioning circuit according to an embodiment of the present invention;

fig. 4 is a flowchart of a high voltage isolation detection method according to an embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

For easy understanding, referring to fig. 1, the present invention provides a high voltage isolation detection apparatus, including: the voltage sampling module 100, the signal processing module 200, the main control module 300 and the early warning module 400;

the voltage sampling module 100 is configured to perform voltage sampling on a circuit to be tested to obtain a voltage signal, perform signal conditioning on the voltage signal to obtain a first conditioned voltage signal, and send the first conditioned voltage signal to the signal processing module 200;

the signal processing module 200 comprises a rectification module, an amplification module, a peak filtering module and a direct current conditioning module; the rectification module is used for rectifying the first conditioning voltage signal to obtain a rectified voltage signal; the amplifying module is used for amplifying the rectified voltage signal to obtain an amplified voltage signal; the peak filtering module is used for carrying out peak filtering processing on the amplified voltage signal to obtain a filtering signal; the direct current conditioning module is configured to perform voltage conditioning on the filtered signal, output a second conditioned voltage signal having a preset voltage value, and send the second conditioned voltage signal to the main control module 300;

the main control module 300 is configured to perform analog-to-digital conversion on the second conditioned voltage signal to obtain a digital signal, perform inverse operation on the digital signal based on a linear regression algorithm to obtain a voltage amplitude corresponding to the second conditioned voltage signal, compare the voltage amplitude with a preset voltage threshold to determine whether the voltage signal of the circuit to be detected is a high-voltage signal, and if the voltage signal of the circuit to be detected is determined not to be a high-voltage signal, generate a low-voltage early warning signal and send the low-voltage early warning signal to the early warning module 400;

it should be noted that, when calculating the voltage amplitude, the voltage amplitudes corresponding to different voltage measuring points are measured by presetting voltage measuring points of every 1000V between 1000V and 10000V to determine the corresponding relationship between the voltage value and the voltage amplitude during actual measurement, then a linear equation is fitted, and the voltage value can be inversely calculated by a linear regression algorithm, so as to obtain the corresponding voltage amplitude.

The early warning module 400 is used for warning according to the low-voltage early warning signal.

It should be noted that, the voltage sampling is performed on the measured circuit, the signal conditioning is performed on the voltage signal, then the rectification, amplification and peak filtering processing are performed, the dc conditioning is performed on the processed voltage, the conditioned voltage signal with the preset voltage value is output, the analog-to-digital conversion is performed on the conditioned voltage signal, the inverse operation is performed on the digital signal based on the linear regression algorithm, the corresponding voltage amplitude value is obtained, the voltage amplitude value is compared with the preset voltage threshold value, so as to judge whether the voltage signal of the measured circuit is a high-voltage signal, if the voltage signal of the measured circuit is not the high-voltage signal, the low-voltage early warning signal is generated for warning, and therefore the accuracy of the high-voltage early warning is improved.

In one embodiment, the voltage sampling module comprises a power taking terminal and a sampling conditioning circuit;

as shown in fig. 2, the power-taking terminal includes a conductive copper tube 11, a conductive threaded rod 12 and an insulating layer 13, the conductive copper tube 11 is a tubular structure with one open end, the conductive threaded rod 12 is arranged in the conductive copper tube 11 in a penetrating manner, the insulating layer 13 is arranged on the inner side of the conductive copper tube 11, the conductive copper tube 11 and the conductive threaded rod 12 form a capacitive coupling structure, the conductive copper tube 11 is used for contacting with a circuit to be tested, and the sampling conditioning circuit is electrically connected with the conductive threaded rod 12.

The conductive threaded rod 12 is a metal copper rod, the insulating layer 13 is made of polytetrafluoroethylene material, and the conductive copper tube 11 and the surface metal of the conductive threaded rod 12 form a capacitive coupling structure, so that the conductive threaded rod has the characteristics of high voltage resistance and high capacitive reactance. The conductive copper tube 11 is used as a sampling electrode and is in contact with a tested circuit, when the conductive copper tube 11 is in contact with high voltage electricity, induced voltage correspondingly appears on the conductive threaded rod 12, the sampling conditioning circuit is electrically connected with the conductive threaded rod 12 and is used for conditioning a voltage signal, and the sampling conditioning circuit is shown in fig. 3.

In a specific embodiment, the signal processing module further includes: and the resistance current-limiting circuit is respectively electrically connected with the voltage sampling module and the rectifying module and is used for carrying out current-limiting processing on the voltage signal.

In order to prevent the breakdown of the components and the internal circuit, a resistor of 100M Ω or more is generally connected in series to limit the current of the voltage signal.

In one embodiment, the rectifying module comprises a first diode and a triode, and the first diode is connected with the triode in parallel.

The first diode and the triode form a parallel connection relation, the parallel connection relation forms a half-wave rectification circuit and is used for rectifying the voltage of 0V of the sampled sinusoidal signal high voltage, the single-phase conduction of the first diode can enable sine to be lower than 0V and not to pass through, the triode has an amplification effect, a single-tube amplification circuit is formed to amplify the rectified half-period sinusoidal wave, and the amplification factor is the beta value of the triode and is about 125 times. Because the high-voltage electric field adopts 50Hz sine alternating current, the sampling circuit keeps the integrity of signals, the output is also sine signals, the diode is limited by half waves, the sampling output is sine signals, when the voltage signals are negative voltages, the diode is conducted, the triode does not work, and when the voltage signals are positive voltages, the diode is cut off, and the triode amplifies the sampling signals.

In a specific embodiment, the peak filtering module comprises a second diode, a resistor and a capacitor which are sequentially connected in series.

It will be appreciated that the amplified signal may be filtered by the peak filtering module and the dc signal at the voltage peak may be maintained.

In one embodiment, the apparatus further comprises: power module and voltage stabilizing module, power module are connected with voltage stabilizing module electricity, and voltage stabilizing module is connected with the host system electricity.

The power supply module supplies power through an XC6209 chip, and voltage-stabilizing output of the power supply IC chip is realized through a CE port.

In one embodiment, the apparatus further comprises: and the display module is in communication connection with the main control module through an IIC protocol.

In one example, the display module uses a 0.91 inch white OLED screen, communicating using the IIC protocol to display voltage signal levels, e.g., low voltage, high voltage.

In one embodiment, the apparatus further comprises: the voice broadcast module is in communication connection with the main control module.

The voice broadcast module adopts JQD170 voice chips, can store 170S voice, adopts single-wire time coding communication, and programs adopt time segmentation to carry out various items of voice broadcast.

In one embodiment, the early warning module employs a warning light.

The above is a detailed description of an embodiment of a high voltage isolation detection apparatus provided by the present invention, and the following is a detailed description of an embodiment of a detection method based on the above high voltage isolation detection apparatus provided by the present invention.

For convenience of understanding, referring to fig. 4, the detection method based on the above-mentioned high voltage isolation detection apparatus provided by the present invention includes the following steps:

s1, performing voltage sampling on the tested circuit to obtain a voltage signal, and performing signal conditioning on the voltage signal to obtain a first conditioned voltage signal;

s2, rectifying the first conditioning voltage signal to obtain a rectified voltage signal;

s3, amplifying the rectified voltage signal to obtain an amplified voltage signal;

s4, performing peak value filtering processing on the amplified voltage signal to obtain a filtering signal;

s5, performing voltage conditioning on the filtering signal, and outputting a second conditioning voltage signal with a preset voltage value;

s6, performing analog-to-digital conversion on the second conditioning voltage signal to obtain a digital signal, and performing inverse operation on the digital signal based on a linear regression algorithm to obtain a voltage amplitude corresponding to the second conditioning voltage signal;

and S7, comparing the voltage amplitude with a preset voltage threshold value to judge whether the voltage signal of the circuit to be detected is a high-voltage signal, and if the voltage signal of the circuit to be detected is not the high-voltage signal, generating a low-voltage early warning signal to warn.

It is clear to those skilled in the art that, for convenience and brevity of description, the method described above may refer to the corresponding process in the foregoing embodiment of the apparatus, and will not be described herein again.

In the several embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A high voltage isolation detection device, comprising: the device comprises a voltage sampling module, a signal processing module, a main control module and an early warning module;

the voltage sampling module is used for sampling voltage of a tested circuit to obtain a voltage signal, conditioning the voltage signal to obtain a first conditioning voltage signal, and sending the first conditioning voltage signal to the signal processing module;

the signal processing module comprises a rectifying module, an amplifying module, a peak filtering module and a direct current conditioning module; the rectification module is used for rectifying the first conditioning voltage signal to obtain a rectified voltage signal; the amplifying module is used for amplifying the rectified voltage signal to obtain an amplified voltage signal; the peak filtering module is used for carrying out peak filtering processing on the amplified voltage signal to obtain a filtering signal; the direct current conditioning module is used for conditioning the voltage of the filtering signal, outputting a second conditioning voltage signal with a preset voltage value and sending the second conditioning voltage signal to the main control module;

the main control module is used for performing analog-to-digital conversion on the second conditioning voltage signal to obtain a digital signal, performing inverse operation on the digital signal based on a linear regression algorithm to obtain a voltage amplitude corresponding to the second conditioning voltage signal, and comparing the voltage amplitude with a preset voltage threshold value to judge whether the voltage signal of the circuit to be detected is a high-voltage signal, if the voltage signal of the circuit to be detected is not the high-voltage signal, generating a low-voltage early warning signal and sending the low-voltage early warning signal to the early warning module;

the early warning module is used for giving an alarm according to the low-voltage early warning signal.

2. The high voltage isolation detection device according to claim 1, wherein the voltage sampling module comprises a power-taking terminal and a sampling conditioning circuit;

the electricity taking terminal comprises a conductive copper pipe, a conductive threaded rod and an insulating layer, the conductive copper pipe is of a cylindrical structure with one end open, the conductive threaded rod penetrates through the conductive copper pipe, the insulating layer is arranged on the inner side of the conductive copper pipe, the conductive copper pipe and the conductive threaded rod form a capacitive coupling structure, the conductive copper pipe is used for being in contact with a circuit to be tested, and the sampling conditioning circuit is electrically connected with the conductive threaded rod.

3. The high voltage isolation detection device of claim 2, wherein the signal processing module further comprises: and the resistance current-limiting circuit is respectively electrically connected with the voltage sampling module and the rectifying module and is used for carrying out current-limiting processing on the voltage signal.

4. The apparatus of claim 1, wherein the rectifying module comprises a first diode and a transistor, and the first diode is connected in parallel with the transistor.

5. The device according to claim 1, wherein the peak filtering module comprises a second diode, a resistor and a capacitor connected in series in sequence.

6. The high voltage isolation detection device of claim 1, further comprising: the power supply module is electrically connected with the voltage stabilizing module, and the voltage stabilizing module is electrically connected with the main control module.

7. The high voltage isolation detection device of claim 1, further comprising: and the display module is in communication connection with the main control module through an IIC protocol.

8. The high voltage isolation detection device of claim 1, further comprising: the voice broadcasting module is in communication connection with the main control module.

9. The high voltage isolation detection device of claim 1, wherein the early warning module employs a warning light.

10. A detection method based on the high voltage isolation detection device as claimed in claim 1, characterized by comprising the following steps:

carrying out voltage sampling on a tested circuit to obtain a voltage signal, and carrying out signal conditioning on the voltage signal to obtain a first conditioning voltage signal;

rectifying the first conditioning voltage signal to obtain a rectified voltage signal;

amplifying the rectified voltage signal to obtain an amplified voltage signal;

carrying out peak value filtering processing on the amplified voltage signal to obtain a filtering signal;

voltage conditioning is carried out on the filtering signal, and a second conditioning voltage signal with a preset voltage value is output;

performing analog-to-digital conversion on the second conditioning voltage signal to obtain a digital signal, and performing inverse operation on the digital signal based on a linear regression algorithm to obtain a voltage amplitude corresponding to the second conditioning voltage signal;

and comparing the voltage amplitude with a preset voltage threshold value to judge whether the voltage signal of the tested circuit is a high-voltage signal, and if the voltage signal of the tested circuit is not the high-voltage signal, generating a low-voltage early warning signal to alarm.

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