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CN104305628A - Multifunctional monitoring alarm safety helmet for electric power - Google Patents

Multifunctional monitoring alarm safety helmet for electric power Download PDF

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Publication number
CN104305628A
CN104305628A CN201410645317.0A CN201410645317A CN104305628A CN 104305628 A CN104305628 A CN 104305628A CN 201410645317 A CN201410645317 A CN 201410645317A CN 104305628 A CN104305628 A CN 104305628A
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China
Prior art keywords
electric field
alarm
electric power
field induction
induction antenna
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Granted
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CN201410645317.0A
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CN104305628B (en
Inventor
鲍有理
严芬
沈俊东
周微平
许小兵
吴锡斌
仲伟宽
史春旻
张宇
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Wuxi Power Supply Co of Jiangsu Electric Power Co
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Wuxi Power Supply Co of Jiangsu Electric Power Co
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Priority to CN201410645317.0A priority Critical patent/CN104305628B/en
Publication of CN104305628A publication Critical patent/CN104305628A/en
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    • AHUMAN NECESSITIES
    • A42HEADWEAR
    • A42BHATS; HEAD COVERINGS
    • A42B1/00Hats; Caps; Hoods
    • A42B1/24Hats; Caps; Hoods with means for attaching articles thereto, e.g. memorandum tablets or mirrors
    • AHUMAN NECESSITIES
    • A42HEADWEAR
    • A42BHATS; HEAD COVERINGS
    • A42B1/00Hats; Caps; Hoods
    • A42B1/24Hats; Caps; Hoods with means for attaching articles thereto, e.g. memorandum tablets or mirrors
    • A42B1/242Means for mounting detecting, signalling or lighting devices
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02Alarms for ensuring the safety of persons

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Helmets And Other Head Coverings (AREA)

Abstract

本发明涉及一种电力用多功能监测报警安全帽,属于电力安全监测的技术领域。按照本发明提供的技术方案,所述电力用多功能监测报警安全帽,包括安全帽体;在所述安全帽体上设置用于感应工频交流电电场信号的电场感应天线以及用于采集工作环境信息的环境传感器,所述电场感应天线、环境传感器均与安全帽体上的控制处理电路连接,控制处理电路的输出端与安全帽体上的报警器连接;当电场感应天线感应的电场信号或环境传感器采集的环境信息与控制处理电路内的预设安全阈值不匹配时,控制处理电路通过报警器输出报警信息。本发明结构紧凑,佩戴使用方便,能对电力作业时的情况进行有效监测与及时报警,提高电力作业的安全性与可靠性。

The invention relates to a multifunctional monitoring and alarm safety helmet for electric power, which belongs to the technical field of electric power safety monitoring. According to the technical solution provided by the present invention, the multifunctional monitoring and alarming helmet for electric power includes a helmet body; an electric field induction antenna for inducting power frequency alternating current electric field signals and an electric field induction antenna for collecting working environment signals are arranged on the helmet body. An environment sensor for information, the electric field induction antenna and the environment sensor are all connected with the control processing circuit on the helmet body, and the output end of the control processing circuit is connected with the alarm on the safety helmet body; when the electric field signal induced by the electric field induction antenna or When the environmental information collected by the environmental sensor does not match the preset safety threshold in the control processing circuit, the control processing circuit outputs alarm information through the alarm device. The invention has compact structure, is convenient to wear and use, can effectively monitor and timely alarm the situation during electric power operation, and improves the safety and reliability of electric power operation.

Description

电力用多功能监测报警安全帽Multifunctional monitoring and alarm safety helmet for electric power

技术领域 technical field

本发明涉及一种安全帽,尤其是一种电力用多功能监测报警安全帽,属于电力安全监测的技术领域。 The invention relates to a safety helmet, in particular to a multifunctional monitoring and alarm safety helmet for electric power, which belongs to the technical field of electric power safety monitoring.

背景技术 Background technique

目前,电力系统作业现场的工作人员必须佩戴安全帽,现有安全帽普遍使用传统的ABS工程塑料安全帽,无各种智能及检测功能。电力系统作业现场的工作人员有近电报警手表供作业人员使用,由于电力《安规》对近电报警手表无强制使用规定,因此佩戴的程度不高。此外,部分变电站高压室配置SF6气体检测、空气含氧量检测装置,当感应到SF6含量超标时,发出“气体SF6泄漏报警”信号。但是因为是装配在固定地点,不能覆盖所有可能有危险的区域。 At present, the staff at the power system operation site must wear safety helmets. The existing safety helmets generally use traditional ABS engineering plastic safety helmets without various intelligence and detection functions. The staff at the power system operation site have near-electric alarm watches for the workers to use. Since there is no mandatory use of near-electric alarm watches in the "Safety Regulations" of the electric power, the degree of wearing them is not high. In addition, some substation high-pressure rooms are equipped with SF6 gas detection and air oxygen content detection devices. When the SF6 content exceeds the standard, a "gas SF6 leakage alarm" signal is issued. However, because it is assembled in a fixed location, it cannot cover all potentially dangerous areas.

在电力维护或配电运行的工作中,工作人员经常需要与带电的设备打交道,虽然工作人员受到过专业训练,仍不能避免意外的发生,全国电网中各种触电事故及其他各类事故时常发生,无法杜绝。电力行业急需一种能够随时随地的全方位提醒工作人员的可穿戴式安全装置。 In the work of power maintenance or power distribution operation, the staff often need to deal with live equipment. Although the staff has received professional training, accidents cannot be avoided. Various electric shock accidents and other accidents often occur in the national power grid , cannot be eliminated. The power industry is in urgent need of a wearable safety device that can remind workers in all directions anytime and anywhere.

发明内容 Contents of the invention

本发明的目的是克服现有技术中存在的不足,提供一种电力用多功能监测报警安全帽,其结构紧凑,佩戴使用方便,能对电力作业时的情况进行有效监测与及时报警,提高电力作业的安全性与可靠性。 The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a multi-functional monitoring and alarm safety helmet for electric power, which is compact in structure, easy to wear and use, can effectively monitor and timely alarm the situation during electric power operation, and improve the safety performance of electric power. Operational safety and reliability.

按照本发明提供的技术方案,所述电力用多功能监测报警安全帽,包括安全帽体;在所述安全帽体上设置用于感应工频交流电电场信号的电场感应天线以及用于采集工作环境信息的环境传感器,所述电场感应天线、环境传感器均与安全帽体上的控制处理电路连接,控制处理电路的输出端与安全帽体上的报警器连接;当电场感应天线感应的电场信号或环境传感器采集的环境信息与控制处理电路内的预设安全阈值不匹配时,控制处理电路通过报警器输出报警信息。 According to the technical solution provided by the present invention, the multifunctional monitoring and alarming helmet for electric power includes a helmet body; an electric field induction antenna for inducting power frequency alternating current electric field signals and an electric field induction antenna for collecting working environment signals are arranged on the helmet body. An environment sensor for information, the electric field induction antenna and the environment sensor are all connected with the control processing circuit on the helmet body, and the output end of the control processing circuit is connected with the alarm on the safety helmet body; when the electric field signal induced by the electric field induction antenna or When the environmental information collected by the environmental sensor does not match the preset safety threshold in the control processing circuit, the control processing circuit outputs alarm information through the alarm device.

所述安全帽体上设置三个电场感应天线,电场感应天线位于安全帽体的顶端。所述环境传感器包括六氟化硫气体传感器,所述六氟化硫气体传感器位于安全帽体的帽沿上。 Three electric field induction antennas are arranged on the helmet body, and the electric field induction antenna is located at the top of the helmet body. The environmental sensor includes a sulfur hexafluoride gas sensor, and the sulfur hexafluoride gas sensor is located on the brim of the helmet body.

所述报警器采用扬声器。 The alarm adopts a loudspeaker.

所述控制处理电路包括数据处理器,电场感应天线通过信号放大电路与数据处理器连接;信号放大电路包括运算放大器U1,运算放大器U1的反相端接地,运算放大器U1的同相端与电阻R1的一端、可调电阻R2的动端以及可调电阻R2的一静端连接,可调电阻R2的另一静端与运算放大器U1的输出端连接,运算放大器U1的输出端与数据处理器内的AD模块连接。 The control processing circuit includes a data processor, and the electric field induction antenna is connected with the data processor through a signal amplifying circuit; the signal amplifying circuit includes an operational amplifier U1, the inverting end of the operational amplifier U1 is grounded, and the non-inverting end of the operational amplifier U1 is connected to the resistor R1. One end, the moving end of the adjustable resistor R2 and one static end of the adjustable resistor R2 are connected, the other static end of the adjustable resistor R2 is connected to the output end of the operational amplifier U1, and the output end of the operational amplifier U1 is connected to the AD module connection.

所述安全帽体内设有压力开关以及手动开关,所述手动开关与压力开关并联;压力开关的一端与电源的正极连接,另一端与控制处理电路连接,电源的负极与控制处理电路连接。 A pressure switch and a manual switch are provided in the safety helmet, and the manual switch is connected in parallel with the pressure switch; one end of the pressure switch is connected to the positive pole of the power supply, the other end is connected to the control processing circuit, and the negative pole of the power supply is connected to the control processing circuit.

所述六氟化硫气体传感器通过485总线与控制处理电路连接。 The sulfur hexafluoride gas sensor is connected with the control processing circuit through the 485 bus.

本发明的优点:安全帽体上设置电场感应天线以及六氟化硫气体传感器,通过电场感应天线来感应工作现场高压电的电场信号,通过六氟化硫气体传感器来检测工作现场的六氟化硫气体值,控制处理电路根据检测的电场信号或六氟化硫气体值与预设安全阈值的关系,能通过报警器进行报警,结构紧凑,佩戴使用方便,能对电力作业时的情况进行有效监测与及时报警,提高电力作业的安全性与可靠性。 The advantages of the present invention are that an electric field induction antenna and a sulfur hexafluoride gas sensor are arranged on the helmet body, and the electric field signal of the high-voltage electricity at the work site is sensed by the electric field induction antenna, and the hexafluoride at the work site is detected by the sulfur hexafluoride gas sensor. Sulfur gas value, the control processing circuit can alarm through the alarm according to the detected electric field signal or the relationship between the sulfur hexafluoride gas value and the preset safety threshold. Effective monitoring and timely alarm to improve the safety and reliability of power operations.

附图说明 Description of drawings

图1为本发明的结构示意图。 Fig. 1 is a structural schematic diagram of the present invention.

图2为本发明的电路原理图。 Fig. 2 is a schematic circuit diagram of the present invention.

附图标记说明:1-安全帽体、2-电场感应天线、3-六氟化硫气体传感器、4-报警器、5-控制处理电路、6-数据处理器以及7-信号放大电路。 Explanation of reference numerals: 1-safety helmet body, 2-electric field induction antenna, 3-sulfur hexafluoride gas sensor, 4-alarm, 5-control processing circuit, 6-data processor and 7-signal amplifying circuit.

具体实施方式 Detailed ways

下面结合具体附图和实施例对本发明作进一步说明。 The present invention will be further described below in conjunction with specific drawings and embodiments.

如图1所示:为了能对电力作业时的情况进行有效监测与及时报警,提高电力作业的安全性与可靠性,本发明包括安全帽体1;在所述安全帽体1上设置用于感应工频交流电电场信号的电场感应天线2以及用于采集工作环境信息的环境传感器,所述电场感应天线2、环境传感器均与安全帽体1上的控制处理电路5连接,控制处理电路5的输出端与安全帽体1上的报警器4连接;当电场感应天线2感应的电场信号或环境传感器采集的环境信息与控制处理电路5内的预设安全阈值不匹配时,控制处理电路5通过报警器4输出报警信息。 As shown in Figure 1: in order to effectively monitor and report to the police in time when the electric power operation is performed, and to improve the safety and reliability of the electric power operation, the present invention includes a safety helmet body 1; An electric field induction antenna 2 for inducting power frequency AC electric field signals and an environmental sensor for collecting work environment information, the electric field induction antenna 2 and the environmental sensor are all connected to the control processing circuit 5 on the safety helmet body 1, and the control processing circuit 5 The output end is connected with the alarm 4 on the helmet body 1; when the electric field signal induced by the electric field induction antenna 2 or the environmental information collected by the environmental sensor does not match the preset safety threshold in the control processing circuit 5, the control processing circuit 5 passes Alarm 4 outputs alarm information.

具体地,安全帽体1采用现有安全帽相同的结构,以便现场人员的佩戴。通过电场感应天线2能感应工作现场的高压电的电场信号,通过环境传感器来采集工作现场对安全有影响的环境参数,在控制处理电路5内预先设置安全阈值,所述安全阈值包括安全电压的阈值以及安全环境的阈值。 Specifically, the safety helmet body 1 adopts the same structure as the existing safety helmet, so as to be worn by on-site personnel. The electric field signal of the high voltage electric field at the work site can be sensed by the electric field induction antenna 2, and the environmental parameters affecting the safety of the work site are collected through the environmental sensor, and the safety threshold is preset in the control processing circuit 5, and the safety threshold includes a safety voltage. thresholds and thresholds for the security environment.

电场感应天线2感应的电场信号与控制处理器5内预设安全阈值不匹配是指电场感应天线2感应的电场信号不在控制处理器5内预设安全阈值的范围内,控制处理器5则可认定现场电压存在危险。环境传感器采集的环境信息与控制处理器5内预设安全阈值不匹配是指环境传感器采集的环境信号中至少有一项环境信息不在控制处理器5预设安全阈值范围内,此时,控制处理器5认定工作环境现场的环境参数存在危险。在具体实施时,无论是电场信号或环境参数导致工作现场存在安全隐患,控制处理器5均通过报警器4,以便提醒现场工作人员。 The mismatch between the electric field signal induced by the electric field induction antenna 2 and the preset safety threshold in the control processor 5 means that the electric field signal induced by the electric field induction antenna 2 is not within the range of the preset safety threshold in the control processor 5, and the control processor 5 can The site voltage is determined to be dangerous. The environmental information collected by the environmental sensor does not match the preset safety threshold in the control processor 5, which means that at least one piece of environmental information in the environmental signal collected by the environmental sensor is not within the preset safety threshold of the control processor 5. At this time, the control processor 5. It is determined that the environmental parameters of the working environment site are dangerous. During specific implementation, no matter the electrical field signal or the environmental parameters cause potential safety hazards at the work site, the control processor 5 will pass the alarm 4 to remind the site staff.

进一步地,所述安全帽体1上设置三个电场感应天线2,电场感应天线2位于安全帽体1的顶端。安全帽体1上的三个电场感应天线2用来获取空间X、Y以及Z轴方向的50Hz工频交流电电场。 Further, three electric field induction antennas 2 are arranged on the helmet body 1 , and the electric field induction antennas 2 are located at the top of the helmet body 1 . The three electric field induction antennas 2 on the helmet body 1 are used to obtain the 50Hz power frequency AC electric field in the X, Y and Z axis directions of space.

所述环境传感器包括六氟化硫气体传感器3,所述六氟化硫气体传感器3位于安全帽体1的帽沿上。在具体实施时,六氟化硫气体传感器3可以采用德国smartGAS公司的smc-sf6传感器,所述六氟化硫气体传感器通过485总线与控制处理电路5连接。当然,当需要检测工作现场的其他环境参数时,环境传感器需要为相应的传感器结构。 The environmental sensor includes a sulfur hexafluoride gas sensor 3 , and the sulfur hexafluoride gas sensor 3 is located on the brim of the safety helmet body 1 . In a specific implementation, the sulfur hexafluoride gas sensor 3 can adopt the smc-sf6 sensor of the German smartGAS company, and the sulfur hexafluoride gas sensor is connected to the control processing circuit 5 through the 485 bus. Of course, when it is necessary to detect other environmental parameters of the work site, the environmental sensor needs to be a corresponding sensor structure.

所述报警器4采用扬声器。本发明实施例中,报警器4还可以采用其他的报警形式,如声光报警等,只要能够有效提醒现场工作人员即可,具体为本技术人员所熟知,此处不再赘述。 Described alarm 4 adopts loudspeaker. In the embodiment of the present invention, the alarm device 4 can also adopt other alarm forms, such as sound and light alarm, etc., as long as it can effectively remind the on-site staff, which is well known to those skilled in the art, and will not be repeated here.

如图2所示,所述控制处理电路5包括数据处理器6以及用于提供工作电源的电池组,即电源采用电池组的形式。电场感应天线2通过信号放大电路7与数据处理器6连接;信号放大电路包括运算放大器U1,运算放大器U1的反相端接地,运算放大器U1的同相端与电阻R1的一端、可调电阻R2的动端以及可调电阻R2的一静端连接,可调电阻R2的另一静端与运算放大器U1的输出端连接,运算放大器U1的输出端与数据处理器6内的AD模块连接。 As shown in FIG. 2 , the control processing circuit 5 includes a data processor 6 and a battery pack for providing working power, that is, the power source is in the form of a battery pack. The electric field induction antenna 2 is connected with the data processor 6 through the signal amplifying circuit 7; the signal amplifying circuit includes an operational amplifier U1, the inverting terminal of the operational amplifier U1 is grounded, the non-inverting terminal of the operational amplifier U1 is connected to one end of the resistor R1, and one end of the adjustable resistor R2 The moving end is connected to one static end of the adjustable resistor R2, the other static end of the adjustable resistor R2 is connected to the output end of the operational amplifier U1, and the output end of the operational amplifier U1 is connected to the AD module in the data processor 6.

其中,图2中只示出了一个电场感应天线2与数据处理器6的连接,数据处理器6可以采用现有常用的微处理器,如单片机等。运算放大器U1的反相端、电阻R1的另一端用于与电场感应天线2连接,电场感应天线2可以采用类似电容的结构,电场感应天线2的具体实施结构也为本技术领域人员所熟知,此处不再赘述。通过可调电阻R2能调节输入数据处理器6内的电压大小,数据处理器6进行数字滤波,在保留50Hz的电场信号。数据处理器6将接收的电压信号与预设电压安全阈值比较,当电压信号超过预设电压安全阈值时,数据处理器6能通过报警器4报警。本发明实施例中,预设电压安全阈值可以根据不同的工作现场进行确定。 Wherein, Fig. 2 only shows the connection between one electric field induction antenna 2 and the data processor 6, and the data processor 6 may adopt an existing commonly used microprocessor, such as a single chip microcomputer and the like. The inverting end of the operational amplifier U1 and the other end of the resistor R1 are used to connect with the electric field induction antenna 2. The electric field induction antenna 2 can adopt a structure similar to a capacitor, and the specific implementation structure of the electric field induction antenna 2 is also well known to those skilled in the art. I won't repeat them here. The voltage input to the data processor 6 can be adjusted through the adjustable resistor R2, and the data processor 6 performs digital filtering to retain the 50 Hz electric field signal. The data processor 6 compares the received voltage signal with a preset voltage safety threshold, and when the voltage signal exceeds the preset voltage safety threshold, the data processor 6 can give an alarm through the alarm 4 . In the embodiment of the present invention, the preset voltage safety threshold may be determined according to different work sites.

所述安全帽体1内设有压力开关S1以及手动开关S2,所述手动开关S2与压力开关S1并联;压力开关S1的一端与电源的正极连接,另一端与控制处理电路5连接,电源的负极与控制处理电路5连接。 The safety helmet body 1 is provided with a pressure switch S1 and a manual switch S2, the manual switch S2 is connected in parallel with the pressure switch S1; one end of the pressure switch S1 is connected to the positive pole of the power supply, and the other end is connected to the control processing circuit 5, and the power supply The negative electrode is connected to the control processing circuit 5 .

本发明实施例中,当安全帽体1佩戴在工作人员身上时,压力开关S1自动接通闭合,以使得整个安全帽进入工作状态,即只有当压力开关S1闭合后,整个安全帽体1才能进行电场信号以及环境信号的监测。当脱下安全帽体1时,压力开关S1自动断开,从而延长电池的使用寿命。手动开关S2用于人工设置参数或调节调试时用。 In the embodiment of the present invention, when the safety helmet body 1 is worn on the worker, the pressure switch S1 is automatically turned on and off, so that the entire safety helmet enters the working state, that is, only when the pressure switch S1 is closed, the entire safety helmet body 1 can be turned on and off. Carry out monitoring of electric field signals and environmental signals. When the safety helmet body 1 is taken off, the pressure switch S1 is automatically disconnected, thereby prolonging the service life of the battery. Manual switch S2 is used for manually setting parameters or adjusting and debugging.

本发明安全帽体1上设置电场感应天线1以及六氟化硫气体传感器3,通过电场感应天线1来感应工作现场高压电的电场信号,通过六氟化硫气体传感器3来检测工作现场的六氟化硫气体值,控制处理电路5根据检测的电场信号或六氟化硫气体值与预设安全阈值的关系,能通过报警器4进行报警,结构紧凑,佩戴使用方便,能对电力作业时的情况进行有效监测与及时报警,提高电力作业的安全性与可靠性。 The helmet body 1 of the present invention is provided with an electric field induction antenna 1 and a sulfur hexafluoride gas sensor 3, through which the electric field induction antenna 1 senses the electric field signal of the high-voltage electricity at the work site, and through the sulfur hexafluoride gas sensor 3 to detect the electric field signal of the work site Sulfur hexafluoride gas value, the control processing circuit 5 can give an alarm through the alarm 4 according to the detected electric field signal or the relationship between the sulfur hexafluoride gas value and the preset safety threshold. Effective monitoring and timely alarming of real-time conditions to improve the safety and reliability of power operations.

Claims (7)

1. an electric power multifunctional monitoring safety helmet with alarm, comprises safety cap body (1); It is characterized in that: in the upper setting of described safety cap body (1) for responding to the electric field induction antenna (2) of industrial-frequency alternating current electric field signal and the environmental sensor for collecting work environmental information, described electric field induction antenna (2), environmental sensor are all connected with the control treatment circuit (5) in safety cap body (1), and the output of control treatment circuit (5) is connected with the alarm (4) in safety cap body (1); When the electric field signal that electric field induction antenna (2) is responded to or the environmental information that environmental sensor gathers are not mated with the preset security threshold value in control treatment circuit (5), control treatment circuit (5) is by alarm (4) output alarm information.
2. electric power multifunctional monitoring safety helmet with alarm according to claim 1, is characterized in that: described safety cap body (1) is arranged three electric field induction antennas (2), electric field induction antenna (2) is positioned at the top of safety cap body (1).
3. electric power multifunctional monitoring safety helmet with alarm according to claim 1, is characterized in that: described environmental sensor comprises sulfur hexafluoride gas sensor, and described sulfur hexafluoride gas sensor is positioned on the shade of safety cap body (1).
4. electric power multifunctional monitoring safety helmet with alarm according to claim 1, is characterized in that: described alarm (4) adopts loudspeaker.
5. electric power multifunctional monitoring safety helmet with alarm according to claim 1, it is characterized in that: described control treatment circuit (5) comprises data processor (6), and electric field induction antenna (2) is connected with data processor (6) by signal amplification circuit (7); Signal amplification circuit comprises operational amplifier U1, the end of oppisite phase ground connection of operational amplifier U1, the in-phase end of operational amplifier U1 is connected with the moved end of one end of resistance R1, adjustable resistance R2 and a quiet end of adjustable resistance R2, another quiet end of adjustable resistance R2 is connected with the output of operational amplifier U1, and the output of operational amplifier U1 is connected with the A/D module in data processor (6).
6. electric power multifunctional monitoring safety helmet with alarm according to claim 1, is characterized in that: be provided with pressure switch (S1) and hand switch (S2) in described safety cap body (1), described hand switch (S2) is in parallel with pressure switch (S1); One end of pressure switch (S1) is connected with the positive pole of power supply, and the other end is connected with control treatment circuit (5), and the negative pole of power supply is connected with control treatment circuit (5).
7. electric power multifunctional monitoring safety helmet with alarm according to claim 3, is characterized in that: described sulfur hexafluoride gas sensor is connected with control treatment circuit (5) by 485 buses.
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CN114504158A (en) * 2022-01-24 2022-05-17 广东电网有限责任公司广州供电局 Near-electricity early warning safety helmet and early warning method for judging position of field source of electrified place
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CN115149452A (en) * 2022-05-24 2022-10-04 贵州电网有限责任公司 Electric shock prevention method for power grid construction operation
CN115149452B (en) * 2022-05-24 2024-04-19 贵州电网有限责任公司 Electric shock prevention method for power grid construction operation

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