CN201562007U - Intelligent non-contact high voltage electroscope - Google Patents

Abstract

The utility model relates to the technical field of high voltage electroscope, in particular to an intelligent non-contact high voltage electroscope. The utility model comprises a parallel plate capacitor, a multi-channel analog switch, a differential amplifier circuit, a rectification filter circuit, a single-chip microcomputer, and a voice alarm circuit. They are electrically connected in turn, wherein the self-test signal is input to a multi-channel analog switch. The utility model realizes the non-contact electric test, and the response speed is fast. During the electric test process, according to different voltage levels (220V-1000KV), the appropriate alarm threshold is automatically selected, and the measured object with the voltage level of 220V-1000KV is realized. Electricity test, and give humanized voice prompts.

Description

Intelligent non-contact high voltage electroscope

technical field

The utility model relates to the technical field of high voltage electroscope, in particular to an intelligent non-contact high voltage electroscope.

Background technique

At present, high-voltage electroscopes can be divided into two types: contact type and non-contact type according to the electroscope method. Among them, the contact type electroscope has been practically applied in the power system, and there are relevant standards for the design, manufacture and operation of the contact type electroscope. The test method is standardized.

Most contact electroscopes are based on the principle of capacitive voltage division to achieve electrometry. Its one end (high-voltage arm) is in direct contact with the tested equipment, and a PF-level capacitance is formed between the high-voltage arm and the charged body, and the test is realized by detecting the current flowing through the stray capacitance between the other end of the electroscope and the earth. electrical function.

Contact electroscopes must be in direct contact with high-voltage equipment during electrical inspection operations. When the voltage level is high and the insulation conditions cannot be guaranteed, there are certain safety hazards. At the same time, due to the maturity of UHV transmission technology, the voltage level of transmission lines is getting higher and higher. According to the regulations on the height of high-voltage transmission lines from the ground, generally speaking, the higher the line voltage level, the higher the line ground clearance. The operation of the electroscope is inconvenient.

In view of the above shortcomings of contact electroscopes, non-contact electroscopes have received extensive attention. However, the current non-contact electroscopes on the market generally have the disadvantages of poor repeatability, low reliability, and high cost. Moreover, such electroscopes are all developed for a specific voltage level. Not strong, not conducive to promotion and use.

In order to overcome the shortcomings of poor repeatability, low reliability and poor applicability of existing non-contact electroscopes, the utility model proposes an intelligent non-contact high-voltage electroscope.

Utility model content

The purpose of the utility model is to provide an intelligent non-contact high-voltage electroscope to quickly and reliably check whether the high-voltage equipment and the transmission line are electrified.

In order to achieve the above object, the utility model adopts the following technical solutions:

Parallel plate capacitors, multi-channel analog switches, differential amplifier circuits, rectifier and filter circuits, single-chip microcomputers, and voice alarm circuits. Among them, the self-test signal is input into multiple analog switches.

The single-chip microcomputer adopts C8051F330, the voice alarm circuit adopts ISD1700 chip, the multi-channel analog switch adopts CD4053 chip, the differential amplifier circuit adopts AD620 chip, and the rectification filter circuit adopts second-order active filter circuit.

The parallel plate capacitor is made of two aluminum-iron alloy circular plates with a thickness of 3mm, and a plastic plate with a thickness of 5mm and strong insulation performance is sandwiched between them.

The shell surface of the intelligent non-contact high-voltage electroscope is equipped with a power switch, a red light-emitting diode with a diameter of 5mm, a speaker, a battery slot and an insulating rod jack.

The utility model has the following advantages and positive effects:

1) Realize non-contact electrical inspection;

2) Give humanized voice prompts to guide operators to use them correctly;

3) The response speed is fast, the data operation speed is fast, and the conversion accuracy is high;

4) It has a wide range of applications, and automatically adjusts the alarm threshold during the electrical inspection process, realizing the electrical inspection of the measured object with a voltage level of 220V-1000KV.

Description of drawings

Fig. 1 is a composition block diagram of the intelligent non-contact high voltage electroscope provided by the utility model.

Fig. 2 is the schematic diagram of the C8051F330 single-chip microcomputer and its peripheral circuit adopted in the utility model.

Fig. 3 is a schematic diagram of a multi-channel analog switch circuit in the present invention.

Fig. 4 is a schematic diagram of the differential amplifier circuit in the present invention.

Fig. 5 is a schematic diagram of the rectification and filtering circuit in the utility model.

Fig. 6 is a schematic diagram of the voice alarm circuit in the utility model.

Fig. 7 is a work flow diagram of the utility model.

in,

1-parallel plate capacitor, 2-self-test signal, 3-multi-channel analog switch, 4-differential amplifier circuit, 5-rectifier filter circuit, 6-single chip microcomputer, 7-voice alarm circuit; S1-power on, S2-pass the self-test Judgment, S3-pre-check, S4-detection, S5-Y-X>Z judgment, S6-voice alarm.

Detailed ways

Below with specific embodiment in conjunction with accompanying drawing, the utility model is further described:

The intelligent non-contact high-voltage electroscope provided by the utility model specifically adopts the following technical scheme, referring to Fig. 1, including a parallel plate capacitor 1, a multi-channel analog switch 3, a differential amplifier circuit 4, a rectifying and filtering circuit 5, a single-chip microcomputer 6, and a voice alarm Circuit 7, above-mentioned plate capacitor 1, multi-channel analog switch 3, differential amplifier circuit 4, rectification filter circuit 5, single-chip microcomputer 6, and voice alarm circuit 7 are electrically connected in sequence, wherein self-test signal 2 is input to pin 2 of multi-channel analog switch 3.

Among them, single-chip microcomputer 6 adopts C8051F330, and voice alarm circuit 7 adopts ISD1700 chip to form.

Parallel plate capacitor 1 is made of two aluminum-iron alloy discs with a thickness of 3mm, and a plastic plate with a thickness of 5mm and strong insulating performance sandwiched between them.

The shell surface of the intelligent non-contact high voltage electroscope is equipped with a power switch, a red light-emitting diode with a diameter of 5mm, a speaker, a battery slot and an insulating rod jack.

The utility model adopts a parallel plate capacitor as a sensing unit, and induces the electric field near the high-voltage equipment through the parallel plate capacitor, so as to generate a voltage between two polar plates. The voltage signal enters the analog-to-digital conversion unit after being amplified, rectified, and filtered. The single-chip microcomputer C8051F330 converts the voltage signal into a digital signal, and the single-chip microcomputer analyzes the obtained data to determine whether the device has power and control the voice alarm. The circuit gives corresponding instructions. Among them, the alarm threshold is automatically set by the C8051F330 microcontroller according to the values detected in different voltage environments.

Fig. 2 is the C8051F330 single-chip microcomputer adopted in the utility model and its peripheral circuit schematic diagram, and each pin function of its C8051F330 single-chip microcomputer is as follows: 1 pin is used for controlling the working state indication LED, 4 pins are analog signal input ends, 5 pins are grounded, 6 pins Pins are working power supply, pins 7 and 8 are programming and debugging circuit interfaces, pins 13, 14, 15, and 16 are voice alarm circuit control ports, and pin 19 is an analog multi-way switch circuit control port.

Fig. 3 is the principle diagram of multi-channel analog switch circuit in the utility model, wherein, Vi1 and Vi2 are the signals at both ends of the parallel plate capacitor, and P0.5 is used to control the work of CD4053. When P0.5 is 0, pin 12 and pin 2 Connect the signal of pin 14 and pin 15 respectively, that is, connect the self-test signal to the circuit; when P0. terminal signal into the circuit.

Fig. 4 is the schematic diagram of the differential amplifier circuit in the utility model, the 2 and 3 pins of the AD620 chip are the differential signal input terminals, respectively connected to the analog multi-way switch circuit 14 and 15 pins, and the 6 pins are the signal output terminals, adjust the resistance of R16 The value changes the magnification.

Fig. 5 is a schematic diagram of the rectification and filtering circuit in the present invention, wherein Sin is a differentially amplified voltage signal, which is output from pin 6 of IC3 after rectification and filtering, and input to pin 4 of the single-chip microcomputer C8051F330.

Fig. 6 is the schematic diagram of the voice alarm circuit in the utility model, wherein pins 4, 5, 6, and 7 of the ISD1700 chip are control ports for reading and writing the ISD1700 of the single-chip microcomputer, pin 9 is a voice input port, and pins 13 and 15 are connected to the speaker.

Below in conjunction with Fig. 7 describe the workflow of the utility model, can be divided into five stages: self-inspection, pre-inspection, cycle detection, comparison, alarm. After turning on the power switch of the electroscope, the system starts to work S1, the power indicator light is on, indicating that the power supply is working normally, and the electroscope automatically enters the self-test stage S2, if the self-test fails, the voice alarm circuit gives "The electroscope cannot work normally" If the self-inspection passes, the electroscope automatically enters the pre-inspection link S3, and stores the currently detected value X into the microcontroller, and the microcontroller reasonably sets the alarm threshold Z according to the value. After the pre-inspection is completed, the inspection The electrical appliance gives a voice prompt "Start the electric inspection", and the electroscope enters the cyclic electric inspection stage S4. The electric detector calculates the value Y of the current position and compares it with the pre-inspection value X to make an alarm judgment S5. When the difference between the two values Y-X is greater than When the alarm threshold Z is set, it is judged that the measured object has electricity, and a voice warning S6 "electricity danger" is given, and the next cycle of electric inspection S4 is entered.

Claims (4)

1. An intelligent non-contact high-voltage electroscope, characterized in that, comprising: Parallel plate capacitor (1), self-test signal (2), multi-channel analog switch circuit (3), differential amplifier circuit (4), rectification filter circuit (5), single-chip microcomputer (6), voice alarm circuit (7), all The plate capacitor (1), multi-channel analog switch circuit (3), differential amplifier circuit (4), rectification filter circuit (5), single-chip microcomputer (6), and voice alarm circuit (7) are electrically connected in sequence, wherein the self-test signal ( 2) Input the multi-channel analog switch (3). 2. The intelligent non-contact high-voltage electroscope according to claim 1, characterized in that: The single-chip microcomputer (6) adopts a C8051F330, the voice alarm circuit (7) adopts an ISD1700 chip, the multi-channel analog switch (3) adopts a CD4053 chip, and the differential amplifier circuit (4) adopts an AD620 chip. 3. The intelligent non-contact high-voltage electroscope according to claim 1 or 2, characterized in that: The parallel plate capacitor (1) is made of two aluminum-iron alloy discs with a thickness of 3 mm, and a plastic plate with a thickness of 5 mm and strong insulation performance sandwiched between them. 4. The intelligent non-contact high-voltage electroscope according to claim 1 or 2, characterized in that: The shell surface of the intelligent non-contact high-voltage electroscope is equipped with a power switch, a red light-emitting diode with a diameter of 5mm, a speaker, a battery slot and an insulating rod jack.

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