CN204010235U - The wireless Antistatic alarm of a kind of electric field induction - Google Patents

Abstract

The utility model provides an electric field induction wireless proximity alarm device. The device is designed based on the principle that metals generate surface induced charges in an electric field, and converts the induced charges on the metal surface into current signals, which are subjected to frequency selection filtering and signal amplification. , and the single-chip microcomputer to sample, convert the measurement result into distance information, and send the alarm information to the alarm host through the wireless communication module, and the host will make an audible and visual alarm according to the received command information. This device can realize fast and accurate identification of the electric field, and can promptly remind the staff to improve their safety awareness. It can be widely used in construction operations near 110KV and above high-voltage live lines, which can effectively reduce personnel and equipment losses and improve power enterprises. security protection capabilities.

Description

An electric field induction wireless proximity alarm device

technical field

The utility model relates to the technical field of proximity alarms, in particular to an electric field induction wireless proximity alarm device.

Background technique

At present, due to the complexity of the power grid structure, the number and types of equipment are constantly expanding, and the corresponding inspection items and test methods are also increasing, which greatly strengthens the work intensity of inspection and maintenance personnel. Due to the influence of human factors, the workload In a big way, the staff's safety awareness will have obvious defects, and they will often be negligent, and even operate in violation of regulations. The most prominent is the occurrence of various electric shock accidents, which have brought great harm to the safety of personnel.

According to the national GBT12720 power frequency electric field measurement standard, when a single-phase voltage source is connected to a conductive boundary surface (such as an electrode), an electric field vector oscillating along a fixed axis is generated at any point in the affected space, which is a single-phase AC electric field; when an AC three-phase voltage source is respectively connected to a conductive boundary surface (such as an electrode), an electric field vector that rotates in space is usually generated. The rotation vector describes an ellipse whose semi-major axis represents the magnitude and direction of the maximum value of the electric field intensity, and whose semi-minor axis represents the magnitude and direction of the minimum value of the electric field strength, and lags behind the maximum value by a quarter period. On the conductive interface, the rotation vector is an oscillating vector, and its direction is perpendicular to the surface, which is a three-phase AC electric field. Therefore, relying on the principle of electric field generation, some parameters such as distance or induction can be measured. Electric field strength, to achieve the purpose of indirect measurement of induced electric field, and vice versa.

The utility model with the application number of 201310104229.5 provides a safety helmet with near electric alarm, which includes a safety helmet with a searchlight at the front end, and an electric field induction sensor, an amplifier, a controller, a memory and a power supply arranged inside the safety helmet. The electric field induction sensor is connected to the input end of the amplifier, the output end of the amplifier is connected to the input end of the controller, and the output end of the controller is connected to the memory; an alarm is arranged outside the helmet, and the The output end of the controller is connected with the alarm. The proximity electric alarm safety helmet has the advantages of simple structure, convenient portability, safety and reliability, and convenient operation.

The utility model with the application number of 201220510531.1 relates to a crane anti-shock safety monitoring device, including two sets of electric field sensors, distance measuring equipment, processors, sound and light alarm equipment, and power supply equipment. Set at the limit safety distance, the distance measuring device and the electric field sensor transmit data to the processor, and the processor triggers the sound and light alarm device to alarm; the sound and light alarm device is set on the driver's cab and the vehicle body. The utility model has the advantages of simple structure, convenient application, preventing accidents caused by the booms of cranes and high-altitude operating vehicles from touching live equipment, and improving work safety factor.

For the above scheme, apply the principle of electric field to carry out safety warning. On the one hand, the sensitivity and radiation intensity of the power frequency electric field response element should be considered to avoid the reaction lagging, the alarm is not timely or the detection element is in close contact with the human body and cause damage. On the other hand , through improvement, this measurement and alarm scheme can be widely implemented and applied to various fields of construction operations, so as to effectively reduce the loss of personnel and equipment.

Utility model content

The utility model provides an electric field induction wireless proximity alarm device, which can detect surrounding electric field strength signals in real time and send out alarm information to remind operators to pay attention, thereby avoiding the occurrence of electric shock accidents.

In order to achieve the above purpose, the technical solution adopted by the utility model is: an electric field induction wireless proximity alarm device, including a sensing module, a signal processing module, a sampling module, a transmission module and an alarm module; the transmission module adopts a wireless mode , divided into a sending end and a receiving end; the sensing module, the signal processing module, and the sampling module are sequentially connected, and the output end of the sampling module is connected to the sending end of the transmission module; the receiving end of the transmission module The terminal is connected to the input terminal of the alarm module.

The alarm device adopts a split type, the sending end of the sensing module, the signal processing module, the sampling module and the transmission module constitutes a detection probe, and the receiving end of the transmission module and the alarm module constitute a receiving end. device.

Both the detection probe and the receiver include a storage battery and a charging interface.

The storage battery is connected to a work switch, and the work switch is connected to a buzzer and an indicator light.

Both the sampling module and the alarm module include a single-chip microcomputer.

The sensing module includes an electric field sensor, and the signal processing module includes a rectification and filtering circuit and an amplification circuit.

The alarm module adopts sound and light alarm mode.

The working method of this warning device comprises the following steps:

1) Before the first use, charge the detection probe and the receiver for 12 hours, and then charge it every 24 hours for 10 to 12 hours or the charging indicator goes out if continuous work is required;

2) Take out the detection probe and receiver, and turn on the power of the receiver, see if the switch buzzer emits a "beep" sound, and observe whether the working indicator light is on;

3) Turn on the power of the detection probe, and observe whether the buzzer and working indicator light of the probe are normal, and then observe whether the probe connection light at the receiver end is on, and judge whether the probe is normal and whether the connection between the probe and the receiver is normal;

4) If both displays are normal, select the placement body and placement method of the probe and receiver according to the specific environment to be tested;

5) If both displays are abnormal, first check whether the battery is sufficient and whether the contact is good, and then check whether there is a circuit fault until it returns to normal;

6) After the probe and receiver are installed, it enters the detection stage. The probe detects the electric field strength signal around the high-voltage power line in real time, and induces the current signal. After filtering and amplification processing, it enters the single-chip microcomputer for judgment. If the signal is greater than the alarm threshold, Then the single-chip microcomputer sends out an alarm sign signal through the wireless module, and the receiver receives the alarm command, and transmits it to the alarm device, and sends out an audible and visual alarm prompt;

7) After the alarm device is tested, if it is not used for a long time, the surface should be cleaned and properly placed in a special box to ensure normal operation next time.

The electric field induction wireless proximity alarm device in the utility model is designed based on the principle that metals generate surface induced charges in the electric field. Frequency selective filtering and signal amplification, and then sent to the microcontroller for sampling. Since the sensor will be interfered by a lot of clutter or power frequency noise during the process of converting the induced charge into a current signal, for high-frequency clutter, a low-pass filter is set at the input end of the rectification and filtering circuit, while for low-frequency The noise is directly bypassed with a large capacitor to ensure the accuracy of the signal, and then the filtered signal is amplified to realize the call of the subsequent processing module. Both the probe and the receiver end use single-chip microcomputers to avoid response delays, untimely or inaccurate alarms. The single-chip timers are set for timing interrupts, and a timing interrupt signal is generated every short time interval and transferred to interrupt processing. Subroutine, the subroutine reads the current signal from the I/O port of the microcontroller, and calls the timing interrupt A/D processing subroutine, then compares the A/D conversion result with the predetermined setting alarm value, if it is greater than the setting value, then the The sending end of the transmission device outputs an alarm signal for alarm processing; the receiving end of the transmission device receives the alarm signal and sends it to the alarm device, and the single-chip microcomputer in the alarm device performs rapid signal identification and response, and adopts sound and light according to the judgment. Alarm measures.

The single-chip microcomputer can adopt AVR series. The single-chip microcomputer program includes the main program, interrupt service subroutine, timing service subroutine, A/D conversion subroutine, and data processing subroutine, all of which can be designed in C language and packaged in the data register of the single-chip microcomputer. It is convenient to call directly. Among them, the main program of the system mainly completes the initialization of ports, timers, A/D converters, constants, variables and other quantities of the system, and at the same time completes the leakage current cycle display work; the interrupt service subroutine is mainly based on the T0IF bit of the INTCON register. The data judges whether TMR0 overflows, and if overflows, transfers to the TMR0 interrupt entry subroutine; judges whether RB has input changes according to the data of the RBIF bit of the INTCON register, and transfers to the keyboard interrupt entry subroutine if there is a change; the timing interrupt service subroutine and A /D Converts subroutines. Mainly complete the A/D conversion task, 1 ms for 1 processing, 6 consecutive samples each time, and store the sampling results in the designated memory unit; the data processing subroutine mainly completes the calculation of the average value of the A/D conversion data, compares the data, and determines Whether to call the police, etc.

The transmission module in the utility model adopts the wireless mode, and is divided into a sending end and a receiving end, mainly to extend the measurement distance, ensure the expansion of the measurement range and the safety of the near-electric personnel, and the transmission module can choose a multi-channel micro-power embedded wireless The digital transmission module adopts efficient cyclic interleaving error correction and detection coding, which greatly improves the anti-interference and sensitivity. It can correct a maximum of 24 bits of continuous burst errors, and can modify various parameters such as serial port rate, transmission power, and radio frequency rate online, which can be transparent To transmit data of any size, there is no need to write complicated settings and transmission programs. The response is sensitive and the transmission effect is good. The effective transmission distance can reach 1000 meters.

The device and the applied technical scheme involved in the utility model can realize fast and accurate identification of the electric field, and can promptly remind the staff to improve their safety awareness, and can be widely used in construction operations near 110KV and above high-voltage live lines, It can effectively reduce the loss of personnel and equipment, and improve the safety and protection capabilities of power companies.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the detecting and emitting part of the device of the present invention.

Fig. 2 is a structural principle diagram of the alarm receiving part of the device of the present invention.

Fig. 3 is the work flowchart of the utility model device.

Detailed ways

As shown in Figures 1 to 3, an electric field induction wireless proximity alarm device includes a sensing module 1, a signal processing module 2, a sampling module 3, a transmission module and an alarm module 6; the transmission module adopts a wireless mode and is divided into sending The terminal 4 is connected to the receiving terminal 5; the sensing module 1, the signal processing module 2, and the sampling module 3 are connected sequentially, and the output terminal of the sampling module 3 is connected to the transmitting terminal 4 of the transmission module; the receiving terminal 5 of the transmission module is connected to the input terminal of the alarm module 6 .

The alarm device adopts a split type, which is generally divided into two parts. The sending end of the sensing module, signal processing module, sampling module and transmission module constitutes the detection probe, and the receiving end of the transmission module and the alarm module constitute the receiver; the detection probe and the receiver Both include a working switch 7, a battery 8 and a charging interface 9, the battery 8 is connected to the working switch 7 and the charging interface 9; the working switch 7 is connected to the buzzer 10 and the indicator light 11; both the sampling module and the alarm module include a single-chip microcomputer, and the sensing module includes The electric field sensor; the signal processing module includes a rectification filter circuit and an amplification circuit, and the alarm module adopts sound and light alarm mode.

The alarm process is: signal detection→filtering→secondary amplification→sampling comparison processing→transmission→alarm execution. The device is designed based on the principle that metals generate surface induced charges in the electric field, and converts the induced charges on the metal surface into current signals. After 50Hz frequency selection filtering and signal amplification, the single-chip microcomputer in the sampling module and the alarm module can use AVR mega48 to convert the measurement results into distance information, and send the alarm information to the receiving end through the wireless communication module APC220-43. The received instruction information makes sound and light alarm to remind the operator to pay attention, so as to avoid the occurrence of electric shock accidents. This principle device can be applied to various electric power construction operations.

Embodiment one

The device can be applied to large-scale construction machinery and equipment. For example, in substations, converter stations and other power transmission and transformation units, spring inspections, autumn inspections, and annual inspections are carried out every year, and vehicles such as cranes and aerial work vehicles are often used around live equipment. , once the boom operator is negligent or misjudged, it is easy to cause the boom to touch the live equipment, causing personal injury and death, accidents and power outages. Alarm, when the boom head of the crane with the alarm probe installed is close to a certain range of high-voltage wires, the alarm will send out an audible and visual alarm to remind the crane operator to operate carefully and reduce the probability of accidents caused by careless operation to a certain extent.

Take the crane as an example, before the first use, charge the detection probe and the receiver for 12 hours, then if you need to work continuously, charge it every 24 hours, charge for 10 to 12 hours each time or the charging indicator goes out; take out the detection probe and the receiver, and turn on the power of the receiver, see if the switch buzzer emits a "beep" sound, and observe whether the working indicator light is on; turn on the power of the detection probe, in addition to observing whether the buzzer and working indicator light of the probe are normal , and then observe whether the probe connection light at the receiver is on, and judge whether the probe is normal and whether the connection between the probe and the receiver is normal; if both are abnormal, first check whether the battery is sufficient and whether the contact is good, and then check whether The circuit is faulty until it returns to normal; if both displays are normal, install a magnetic steel base at the bottom of the probe device and the receiver device, and attach the probe device directly to the boom of the crane through the magnetic steel. Place the detector in the operating room, and check again whether the two are well connected, and see if the probe connection light is normal; after the probe and receiver are installed, it enters the detection stage, and the probe detects the electric field strength signal around the high-voltage power line in real time, and induces the current signal , after filtering and amplification processing, enter the single-chip microcomputer AVR mega48 for judgment, for example, the safety distance can be set to 2.5m, if the signal detection distance is greater than the alarm threshold, such as 3m, the single-chip microcomputer sends an alarm sign signal through the wireless module, and the receiver receives it The alarm command is transmitted to the alarm device, and the sound and light alarm is issued; after the alarm device is detected, if it is not used for a long time, it should be removed from the boom and the operating room, and the magnetic steel base should be removed separately, and the surface should be cleaned , and finally properly placed in the special box to ensure normal work next time.

Embodiment two

This device can be applied to some portable equipment for electric inspection, such as ground rod, electric inspection rod, and high-voltage shaker. The staff need to deal with live equipment frequently in the work of power maintenance or power distribution operation, and over time, the charged body and Safety requirements lead to contempt, and accidents cannot be avoided. At this time, these portable electrical testing devices can remind the staff to pay attention to the safe working distance anytime and anywhere.

Take the electric test rod as an example, before the first use, charge the detection probe and the receiver for 12 hours, and then charge it every 24 hours for 10 to 12 hours or the charging indicator goes out; take it out for detection Probe and receiver, and turn on the power of the receiver, see if the switch buzzer emits a "beep" sound, and observe whether the working indicator light is on; turn on the power of the detection probe, and observe whether the buzzer and working indicator light of the probe are normal In addition, observe whether the probe connection light at the receiver end is on, and judge whether the probe is normal and whether the connection between the probe and the receiver is normal; if both are abnormal, first check whether the power is sufficient and whether the contact is good, and then check There is a circuit fault until it returns to normal; if both are normal, then place the probe device and the receiver device on the near end and the hand-held end of the electric test rod respectively through the hoop, or through the transformation of the electric test rod, directly Embed the two parts of the alarm device into the two ends of the electric probe, and check again whether the two are well connected, and see if the probe connection light is normal; after the probe and receiver are installed, it enters the detection stage, and the probe detects the surroundings of the charged body in real time The electric field strength signal, the current signal is induced, after filtering and amplifying, it enters the single-chip AVR mega48 for judgment. For example, the safety distance can be set to 0.6m. If the signal detection distance is greater than the alarm threshold, such as 1m, the single-chip Send out the alarm sign signal, the receiver receives the alarm command, and transmits it to the alarm device, and sends out an audible and visual alarm prompt; The device is removed from both ends of the rod body, cleaned on the surface, and finally properly placed in a special box. If the integrated embedded connection is used, the entire electric test rod must be properly preserved to ensure normal operation next time.

Claims (7)

1. An electric field induction wireless proximity alarm device, comprising a sensing module, a signal processing module, a sampling module, a transmission module and an alarm module, is characterized in that: the transmission module adopts a wireless mode and is divided into a sending end and a receiving end; The sensing module, the signal processing module, and the sampling module are connected in sequence, the output end of the sampling module is connected to the sending end of the transmission module; the receiving end of the transmission module is connected to the input end of the alarm module . 2. The electric field induction wireless proximity alarm device as claimed in claim 1, characterized in that: the alarm device adopts a split type, the sensing module, the signal processing module, the sampling module and the transmission module The sending end of the transmission module forms a detection probe, and the receiving end of the transmission module and the alarm module form a receiver. 3. The electric field induction wireless proximity alarm device according to claim 2, characterized in that: both the detection probe and the receiver include a battery and a charging interface. 4. The electric field induction wireless proximity alarm device according to claim 3, characterized in that: the battery is connected to a working switch, and the working switch is connected to a buzzer and an indicator light. 5. The electric field induction wireless proximity alarm device according to claim 1 or 2, characterized in that: both the sampling module and the alarm module include a single-chip microcomputer. 6. The electric field sensing wireless proximity alarm device according to claim 1 or 2, wherein the sensing module includes an electric field sensor, and the signal processing module includes a rectification and filtering circuit and an amplification circuit. 7. The electric field induction wireless proximity alarm device according to claim 1 or 2, characterized in that: the alarm module adopts sound and light alarm mode.