CN204536414U - A kind of low-voltage network residual current monitoring system - Google Patents
A kind of low-voltage network residual current monitoring system Download PDFInfo
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Abstract
本实用新型提供一种低压配电网剩余电流监测系统,包括可测量剩余电流电能表、后台监测服务器和通信信道;可测量剩余电流电能表分布设置于低压配电网的用户侧,各可测量剩余电流电能表通过通信信道与后台监测服务器双向信号电连接;通信信道采用RS485总线或电力线载波通信信道;可测量剩余电流电能表包括壳体、接线端子座、相线、零线、继电器、相线电流采样电阻、剩余电流互感器和电路装置。本实用新型结构简单、节约成本、安装方便、安全可靠、易于大面积推广,使用时能有效监测和预警用户的剩余电流,必要时可远程控制切断用户电流以预防火灾等恶性事件的发生,保障供电安全。
The utility model provides a low-voltage distribution network residual current monitoring system, which includes a residual current energy meter that can be measured, a background monitoring server and a communication channel; the residual current energy meters that can be measured are arranged on the user side of the low-voltage distribution network, and each The residual current watt-hour meter is electrically connected to the background monitoring server with two-way signals through the communication channel; the communication channel adopts RS485 bus or power line carrier communication channel; Line current sampling resistors, residual current transformers and circuit devices. The utility model has the advantages of simple structure, cost saving, convenient installation, safety and reliability, and is easy to be popularized in a large area. It can effectively monitor and warn the user's residual current when in use, and can remotely control and cut off the user's current to prevent the occurrence of vicious events such as fires when necessary. Power supply security.
Description
技术领域 technical field
本实用新型涉及配电网领域,具体涉及一种基于可测量剩余电流电能表的低压配电网剩余电流监测系统。 The utility model relates to the field of distribution networks, in particular to a low-voltage distribution network residual current monitoring system based on a measurable residual current electric energy meter.
背景技术 Background technique
在当今社会,电力已经成为人类最重要的能源。随着我国经济的迅猛发展,电能在经济建设和人们的日常生活中发挥着愈来愈重要的作用。然而,在电能造福人们生活的同时,电气火灾也随之大量发生,造成巨大的损失。我国公安消防机关调查1996年到2005年中的电气火灾高达26余万起,约占火灾总数的23.9%。在电气火灾中,有很大一部分是由剩余电流引起的。同时,剩余电流还可能造成人身触电、设备损坏等事故。为此,世界各国的普遍做法是在低压电网中安装剩余电流动作保护器(RCD)。但是,剩余电流保护器只能在剩余电流发生超限时进行跳闸保护,无法进行预警及实时监测。另外,剩余电流保护器的误动作一直是供电部门和用户困惑的事,这不但严重影响了保护器的使用效果,也直接影响了供电的可靠性。引起剩余电流动作保护器误动作的原因是复杂多样的,这些故障需要工作人员到现场进行逐户排查,耗费大量的人力物力,且效率非常低。 In today's society, electricity has become the most important energy source for human beings. With the rapid development of my country's economy, electric energy plays an increasingly important role in economic construction and people's daily life. However, while electric energy benefits people's lives, electrical fires also occur in large numbers, causing huge losses. my country's public security and firefighting agencies have investigated more than 260,000 electrical fires from 1996 to 2005, accounting for about 23.9% of the total number of fires. In electrical fires, a large part is caused by residual current. At the same time, the residual current may also cause personal electric shock, equipment damage and other accidents. For this reason, it is a common practice in countries all over the world to install residual current operated protectors (RCDs) in low-voltage power grids. However, the residual current protector can only perform tripping protection when the residual current exceeds the limit, and cannot perform early warning and real-time monitoring. In addition, the misoperation of the residual current protector has always been a confusing matter for the power supply department and users, which not only seriously affects the use effect of the protector, but also directly affects the reliability of the power supply. The reasons for the misoperation of residual current operated protectors are complex and diverse. These faults require the staff to go to the site to conduct door-to-door investigations, which consumes a lot of manpower and material resources, and the efficiency is very low.
实用新型内容 Utility model content
本实用新型的目的是:提供一种结构简单、节约成本、安装方便、安全可靠的低压配电网剩余电流监测系统,其使用时,能够有效解决低压配电网中用户侧剩余电流的实时监测问题,保障供电安全。 The purpose of this utility model is to provide a low-voltage distribution network residual current monitoring system with simple structure, cost saving, convenient installation, safety and reliability. When it is used, it can effectively solve the real-time monitoring of user-side residual current in low-voltage distribution network problems and ensure the safety of power supply.
本实用新型的技术方案是:本实用新型的低压配电网剩余电流监测系统,其结构特点是:包括可测量剩余电流电能表、后台监测服务器和通信信道; The technical solution of the utility model is: the residual current monitoring system of the low-voltage distribution network of the utility model, and its structural characteristics are: including a residual current electric energy meter, a background monitoring server and a communication channel;
可测量剩余电流电能表分布设置于低压配电网的用户侧;各可测量剩余电流电能表通过通信信道与后台监测服务器双向信号电连接; Measurable residual current watt-hour meters are distributed and arranged on the user side of the low-voltage distribution network; each measurable residual current watt-hour meter is electrically connected to the background monitoring server with a two-way signal through a communication channel;
上述的可测量剩余电流电能表包括壳体、接线端子座、继电器、相线电流采样电阻、相线、零线、剩余电流互感器和电路装置;接线端子座包括第一接线端子、第二接线端子、第三接线端子和第四接线端子;接线端子座固定安装在壳体上;继电器、相线电流采样电阻、相线、零线和剩余电流互感器均设置在壳体内;零线的一端与第三接线端子电连接;零线的另一端与第四接线端子电连接;相线电流采样电阻的一端与第一接线端子电连接;相线电流采样电阻的另一端与继电器电连接;相线的一端与第二接线端子电连接;相线的另一端与继电器电连接;剩余电流互感器设置于相线和零线相靠近处,且相线和零线穿过剩余电流互感器;电路装置与继电器、相线电流采样电阻以及剩余电流互感器分别电连接。 The above measurable residual current watt-hour meter includes a housing, a terminal block, a relay, a phase line current sampling resistor, a phase line, a neutral line, a residual current transformer and a circuit device; the terminal block includes a first connection terminal, a second connection terminal, the third terminal and the fourth terminal; the terminal block is fixedly installed on the shell; the relay, the phase line current sampling resistor, the phase line, the neutral line and the residual current transformer are all set in the shell; one end of the neutral line It is electrically connected to the third terminal; the other end of the neutral line is electrically connected to the fourth terminal; one end of the phase line current sampling resistor is electrically connected to the first terminal; the other end of the phase line current sampling resistor is electrically connected to the relay; One end of the line is electrically connected to the second terminal; the other end of the phase line is electrically connected to the relay; the residual current transformer is arranged near the phase line and the neutral line, and the phase line and the neutral line pass through the residual current transformer; the circuit The device is electrically connected with the relay, the phase line current sampling resistor and the residual current transformer respectively.
进一步的方案是:上述的通信信道为RS485总线。 A further solution is: the above-mentioned communication channel is an RS485 bus.
进一步的方案是:上述的通信信道为电力线载波信道。 A further solution is: the above-mentioned communication channel is a power line carrier channel.
进一步的方案还有:上述的可测量剩余电流电能表的电路装置包括电压采样模块、信号处理模块、A/D转换模块、电能计量模块、单片机处理模块、继电器控制模块、通信模块、LCD显示模块、按键模块和电源模块; A further solution is: the above-mentioned circuit device capable of measuring residual current watt-hour meter includes a voltage sampling module, a signal processing module, an A/D conversion module, an electric energy metering module, a single-chip microcomputer processing module, a relay control module, a communication module, and an LCD display module , button module and power module;
电压采样模块、信号处理模块、A/D转换模块、电能计量模块、单片机处理模块、继电器控制模块、通信模块和电源模块设置在壳体内; A voltage sampling module, a signal processing module, an A/D conversion module, an electric energy metering module, a single-chip microcomputer processing module, a relay control module, a communication module and a power supply module are arranged in the casing;
电压采样模块设有信号输出端;信号处理模块设有电压采样信号输入端、相线电流采样信号输入端、剩余电流信号输入端和信号输出端;A/D转换模块设有信号输入端、第一信号输出端和第二信号输出端;电能计量模块设有信号输入端和信号输出端;单片机处理模块设有采样信号输入端、用电量信号输入端、继电器控制信号输出端、通信端、显示信号输出端和按键信号输入端;继电器控制模块设有信号输入端和控制信号输出端;通信模块设有对内通信端和对外通信端;LCD显示模块设有信号输入端;按键模块设有信号输出端; The voltage sampling module is provided with a signal output terminal; the signal processing module is provided with a voltage sampling signal input terminal, a phase line current sampling signal input terminal, a residual current signal input terminal and a signal output terminal; the A/D conversion module is provided with a signal input terminal, a second A signal output terminal and a second signal output terminal; the electric energy metering module is provided with a signal input terminal and a signal output terminal; the single-chip processing module is provided with a sampling signal input terminal, a power consumption signal input terminal, a relay control signal output terminal, a communication terminal, The display signal output terminal and the button signal input terminal; the relay control module has a signal input terminal and a control signal output terminal; the communication module has an internal communication terminal and an external communication terminal; the LCD display module has a signal input terminal; the key module has a signal output;
信号处理模块的电压采样信号输入端、相线电流采样信号输入端和剩余电流信号输入端分别与电压采样模块的信号输出端、相线电流采样电阻和剩余电流互感器对应电连接;A/D转换模块的信号输入端与信号处理模块的信号输出端电连接;电能计量模块的信号输入端与A/D转换模块的第一信号输出端信号电连接;单片机处理模块的采样信号输入端与A/D转换模块的第二信号输出端信号电连接;单片机处理模块的用电量信号输入端与电能计量模块信号输出端信号电连接;继电器控制模块的信号输入端与单片机处理模块的继电器控制信号输出端信号电连接;继电器控制模块的控制信号输出端与继电器的控制端电连接;通信模块的对内通信端与单片机处理模块的通信端双向信号电连接;通信模块的对外通信端与上述的通信信道信号电连接;LCD显示模块的信号输入端与单片机处理模块的显示信号输出端信号电连接;按键模块的信号输出端与单片机处理模块的按键信号输入端信号电连接;电源模块提供工作电源。 The voltage sampling signal input terminal, the phase line current sampling signal input terminal and the residual current signal input terminal of the signal processing module are respectively electrically connected to the signal output terminal of the voltage sampling module, the phase line current sampling resistor and the residual current transformer; A/D The signal input end of the conversion module is electrically connected with the signal output end of the signal processing module; the signal input end of the electric energy metering module is electrically connected with the first signal output end signal of the A/D conversion module; the sampling signal input end of the single-chip processing module is connected with the A The second signal output terminal signal of the /D conversion module is electrically connected; the power consumption signal input terminal of the single-chip processing module is electrically connected with the signal output terminal signal of the electric energy metering module; the signal input terminal of the relay control module is connected with the relay control signal of the single-chip processing module The output terminal signal is electrically connected; the control signal output terminal of the relay control module is electrically connected with the control terminal of the relay; the internal communication terminal of the communication module is electrically connected with the bidirectional signal of the communication terminal of the single-chip processing module; the external communication terminal of the communication module is connected with the above-mentioned The communication channel signal is electrically connected; the signal input end of the LCD display module is electrically connected with the display signal output end signal of the single-chip processing module; the signal output end of the key module is electrically connected with the key signal input end signal of the single-chip processing module; the power supply module provides working power .
本实用新型具有积极的效果:(1)本实用新型的低压配电网剩余电流监测系统,由分布于用户侧的可测量剩余电流电能表、通信信道和后台监测服务器组成,结构简单、节约成本、安装方便、安全可靠,易于大面积推广。(2)本实用新型的低压配电网剩余电流监测系统,其通信信道可采用RS485总线或电力线载波信道,实现方便,成本较低。(3)本实用新型的低压配电网剩余电流监测系统,其在使用时,通过可测量剩余电流电能表实现对低压配电线路中的用户侧的剩余电流进行实时监测、记录,对于超过预置报警阀值的剩余电流超限事件进行报警;所有用户侧的剩余电流测量数据和记录通过RS485总线或电力线载波信道上传到后台监测服务器,由后台监测服务器对所有用户侧的剩余电流事件进行统计分析,并最终对用户侧的剩余电流事件进行预警,从而能够防患于未然,必要时后台监测服务器可远程控制可测量剩余电流电能表内的继电器动作切断用户电流,以预防火灾等恶性事件的发生,保障供电安全。 The utility model has positive effects: (1) The residual current monitoring system of the low-voltage distribution network of the utility model is composed of a measurable residual current electric energy meter distributed on the user side, a communication channel and a background monitoring server, and has a simple structure and saves costs , Easy to install, safe and reliable, easy to promote in a large area. (2) The communication channel of the low-voltage distribution network residual current monitoring system of the present invention can adopt RS485 bus or power line carrier channel, which is convenient to implement and low in cost. (3) The residual current monitoring system of the low-voltage distribution network of the present utility model realizes real-time monitoring and recording of the residual current on the user side in the low-voltage distribution line through the measurable residual current electric energy meter when it is in use. The residual current over-limit event with the alarm threshold is set to alarm; all user-side residual current measurement data and records are uploaded to the background monitoring server through the RS485 bus or power line carrier channel, and the background monitoring server counts all user-side residual current events. Analysis, and finally early warning of residual current events on the user side, so as to prevent problems before they happen. If necessary, the background monitoring server can remotely control the relay action in the energy meter that can measure residual current to cut off the user's current to prevent fires and other vicious events. occurs to ensure the safety of power supply.
附图说明 Description of drawings
图1为本实用新型的结构示意图; Fig. 1 is the structural representation of the utility model;
图2为图1中可测量剩余电流电能表的结构示意图,图中壳体省略了前盖未画出; Fig. 2 is a structural schematic diagram of the electric energy meter capable of measuring residual current in Fig. 1, in which the housing omits the front cover and is not shown;
图3为图1中可测量剩余电流电能表的电路结构示意框图。 Fig. 3 is a schematic block diagram of the circuit structure of the electric energy meter capable of measuring residual current in Fig. 1 .
上述附图中的附图标记如下: The reference signs in the above-mentioned accompanying drawings are as follows:
可测量剩余电流电能表101,壳体1,接线端子座2,第一接线端子21,第二接线端子22,第三接线端子23,第四接线端子24, 继电器3,相线电流采样电阻4,相线5,零线6,剩余电流互感器7,电路装置8; Measurable residual current watt-hour meter 101, housing 1, terminal block 2, first terminal 21, second terminal 22, third terminal 23, fourth terminal 24, relay 3, phase wire current sampling resistor 4 , phase line 5, neutral line 6, residual current transformer 7, circuit device 8;
后台监测服务器102, background monitoring server 102,
通信信道103。 communication channel 103 .
具体实施方式 Detailed ways
下面结合附图和具体实施方式对本实用新型作进一步详细的说明。 Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.
(实施例) (example)
见图1至图3,本实施例的低压配电网剩余电流监测系统,主要由可测量剩余电流电能表101、后台监测服务器102和通信信道103组成。 Referring to FIGS. 1 to 3 , the low-voltage distribution network residual current monitoring system of this embodiment is mainly composed of a residual current energy meter 101 , a background monitoring server 102 and a communication channel 103 .
可测量剩余电流电能表101分布设置于低压配电网的用户侧;各可测量剩余电流电能表101通过通信信道103与后台监测服务器102双向信号电连接。 Measurable residual current energy meters 101 are distributed and arranged on the user side of the low-voltage distribution network; each measurable residual current energy meter 101 is electrically connected to the background monitoring server 102 through a communication channel 103 for bidirectional signals.
可测量剩余电流电能表101主要由壳体1、接线端子座2、继电器3、相线电流采样电阻4、相线5、零线6、剩余电流互感器7和电路装置8组成。 Measurable residual current electric energy meter 101 is mainly composed of housing 1 , terminal block 2 , relay 3 , phase line current sampling resistor 4 , phase line 5 , neutral line 6 , residual current transformer 7 and circuit device 8 .
继电器3固定设置在壳体1内。本实施例中,继电器3优选采用JML82型磁保持继电器。 The relay 3 is fixedly arranged in the casing 1 . In this embodiment, the relay 3 preferably adopts a JML82 type magnetic latching relay.
相线电流采样电阻4设置在壳体1内。相线电流采样电阻4本实施例中优选采用锰铜采样电阻。相线电流采样电阻4的一端与第一接线端子21电连接;相线电流采样电阻4的另一端与继电器3电连接。 The phase line current sampling resistor 4 is arranged in the casing 1 . The phase line current sampling resistor 4 is preferably a manganese copper sampling resistor in this embodiment. One end of the phase line current sampling resistor 4 is electrically connected to the first connection terminal 21 ; the other end of the phase line current sampling resistor 4 is electrically connected to the relay 3 .
相线5、零线6和剩余电流互感器7均设置在壳体1内。 The phase line 5 , the neutral line 6 and the residual current transformer 7 are all arranged in the casing 1 .
相线5的一端与第二接线端子22电连接;相线5的另一端与继电器3电连接。 One end of the phase line 5 is electrically connected to the second terminal 22 ; the other end of the phase line 5 is electrically connected to the relay 3 .
零线6的一端与第三接线端子23电连接;零线6的另一端与第四接线端子24电连接。零线6在壳体1内与相线5相靠近,且零线6与相线5相靠近处折弯成口字形,用于确保剩余电流互感器7在电表正常接线时能正确采样用户线路中的剩余电流。 One end of the neutral wire 6 is electrically connected to the third connection terminal 23 ; the other end of the neutral wire 6 is electrically connected to the fourth connection terminal 24 . The zero line 6 is close to the phase line 5 in the housing 1, and the position where the zero line 6 is close to the phase line 5 is bent into a square shape, which is used to ensure that the residual current transformer 7 can correctly sample the user line when the ammeter is normally connected. in the residual current.
剩余电流互感器7设置于相线5和零线6相靠近处,相线5和零线6穿过剩余电流互感器7。本实施例中,剩余电流互感器7优选采用HLTY1型电流互感器。 The residual current transformer 7 is arranged near the phase line 5 and the neutral line 6 , and the phase line 5 and the neutral line 6 pass through the residual current transformer 7 . In this embodiment, the residual current transformer 7 is preferably a HLTY1 type current transformer.
电路装置8主要由电压采样模块81、信号处理模块82、A/D转换模块83、电能计量模块84、单片机处理模块85、继电器控制模块86、通信模块87、LCD显示模块88、按键模块89和电源模块80组成。 The circuit device 8 is mainly composed of a voltage sampling module 81, a signal processing module 82, an A/D conversion module 83, an electric energy metering module 84, a single-chip processing module 85, a relay control module 86, a communication module 87, an LCD display module 88, a button module 89 and The power module 80 is composed.
电路装置8的电压采样模块81、信号处理模块82、A/D转换模块83、电能计量模块84、单片机处理模块85、继电器控制模块86、通信模块87和电源模块80设置在壳体1内。 The voltage sampling module 81 , signal processing module 82 , A/D conversion module 83 , electric energy metering module 84 , single chip processing module 85 , relay control module 86 , communication module 87 and power supply module 80 of the circuit device 8 are arranged in the housing 1 .
电压采样模块81设有信号输出端;信号处理模块82设有电压采样信号输入端、相线电流采样信号输入端、剩余电流信号输入端和信号输出端;A/D转换模块83设有信号输入端、第一信号输出端和第二信号输出端;电能计量模块84设有信号输入端和信号输出端;单片机处理模块85设有采样信号输入端、用电量信号输入端、继电器控制信号输出端、通信端、显示信号输出端和按键信号输入端;继电器控制模块86设有信号输入端和控制信号输出端;通信模块87设有对内通信端和对外通信端;LCD显示模块88设有信号输入端;按键模块89设有信号输出端。 The voltage sampling module 81 is provided with a signal output terminal; the signal processing module 82 is provided with a voltage sampling signal input terminal, a phase wire current sampling signal input terminal, a residual current signal input terminal and a signal output terminal; the A/D conversion module 83 is provided with a signal input terminal terminal, the first signal output terminal and the second signal output terminal; the electric energy metering module 84 is provided with a signal input terminal and a signal output terminal; the single-chip processing module 85 is provided with a sampling signal input terminal, a power consumption signal input terminal, and a relay control signal output terminal, communication terminal, display signal output terminal and button signal input terminal; relay control module 86 is provided with signal input terminal and control signal output terminal; communication module 87 is provided with internal communication terminal and external communication terminal; LCD display module 88 is provided with Signal input terminal; the button module 89 is provided with a signal output terminal.
信号处理模块82的电压采样信号输入端、相线电流采样信号输入端和剩余电流信号输入端分别与电压采样模块81的信号输出端、相线电流采样电阻4和剩余电流互感器7对应电连接;A/D转换模块83的信号输入端与信号处理模块82的信号输出端电连接;电能计量模块84的信号输入端与A/D转换模块83的第一信号输出端信号电连接;单片机处理模块85的采样信号输入端与A/D转换模块83的第二信号输出端信号电连接;单片机处理模块85的用电量信号输入端与电能计量模块84 信号输出端信号电连接;继电器控制模块86的信号输入端与单片机处理模块85的继电器控制信号输出端信号电连接;继电器控制模块86的控制信号输出端与继电器3的控制端电连接;通信模块87的对内通信端与单片机处理模块85的通信端双向信号电连接;通信模块87的对外通信端使用时与监控后台通信;LCD显示模块88的信号输入端与单片机处理模块85的显示信号输出端信号电连接;按键模块89的信号输出端与单片机处理模块85的按键信号输入端信号电连接;电源模块80为电能表提供工作电源。 The voltage sampling signal input terminal, the phase line current sampling signal input terminal and the residual current signal input terminal of the signal processing module 82 are respectively electrically connected to the signal output terminal of the voltage sampling module 81, the phase line current sampling resistor 4 and the residual current transformer 7 The signal input end of the A/D conversion module 83 is electrically connected with the signal output end of the signal processing module 82; the signal input end of the electric energy metering module 84 is electrically connected with the first signal output end signal of the A/D conversion module 83; The sampling signal input end of the module 85 is electrically connected with the second signal output end signal of the A/D conversion module 83; the power consumption signal input end of the single-chip processing module 85 is electrically connected with the signal output end signal of the electric energy metering module 84; the relay control module The signal input terminal of 86 is electrically connected with the relay control signal output terminal signal of the single-chip processing module 85; the control signal output terminal of the relay control module 86 is electrically connected with the control terminal of the relay 3; the internal communication terminal of the communication module 87 is connected with the single-chip processing module The communication end bidirectional signal of 85 is electrically connected; The external communication end of communication module 87 communicates with monitoring background when using; The signal input end of LCD display module 88 is electrically connected with the display signal output end signal of single-chip processing module 85; The output end is electrically connected to the key signal input end of the single-chip processing module 85; the power supply module 80 provides working power for the electric energy meter.
电路装置8的LCD显示模块88包括安装在壳体1上的LCD显示屏;按键模块89包括安装在壳体1上的按键。LCD显示模块88的LCD显示屏用于正常工作时显示用户的用电量以及剩余电流超限时的报警信息的显示。按键模块89上的按键用于电力用户查阅用电量信息等与电能表的交互。 The LCD display module 88 of the circuit device 8 includes an LCD display installed on the casing 1 ; the button module 89 includes buttons installed on the casing 1 . The LCD display of the LCD display module 88 is used for displaying the power consumption of the user and displaying the alarm information when the remaining current exceeds the limit during normal operation. The buttons on the button module 89 are used for the power user to check the electricity consumption information and interact with the electric energy meter.
通信模块87本实施例中,优选包括红外通信接口、RS485通信接口和载波通信接口。红外通信接口、RS485通信接口和载波通信接口分别设有对内通信端和对外通信端;红外通信接口、RS485通信接口和载波通信接口的对内通信端共同构成前述的通信模块87的对内通信端;红外通信接口、RS485通信接口和载波通信接口的对外通信端共同构成前述的通信模块87的对外通信端。通信模块87的红外通信接口用于工作人员现场设置参数和读取表内数据。RS485通信接口和载波通信接口主要用于与供电部门的监控后台通信。 In this embodiment, the communication module 87 preferably includes an infrared communication interface, an RS485 communication interface and a carrier communication interface. The infrared communication interface, the RS485 communication interface and the carrier communication interface are respectively provided with an internal communication terminal and an external communication terminal; the internal communication terminals of the infrared communication interface, the RS485 communication interface and the carrier communication interface together constitute the internal communication of the aforementioned communication module 87 The external communication terminal of the infrared communication interface, the RS485 communication interface and the carrier communication interface together constitute the external communication terminal of the aforementioned communication module 87. The infrared communication interface of the communication module 87 is used for the staff to set parameters and read the data in the table on site. RS485 communication interface and carrier communication interface are mainly used to communicate with the monitoring background of the power supply department.
可测量剩余电流电能表101和相线电流回路由相线电流采样电阻4、继电器3和相线5组成;相线电流从接线端子座2的第一接线端子21流入、第二接线端子22流出;相线电流信号由相线电流采样电阻4上取得;零线电流回路由零线6构成,零线电流从接线端子座2的第四接线端子24流入,第三接线端子23流出;剩余电流信号由剩余电流采样互感器7取得。 Measurable residual current watt-hour meter 101 and phase line current loop are composed of phase line current sampling resistor 4, relay 3 and phase line 5; phase line current flows in from the first terminal 21 of terminal block 2 and flows out from the second terminal 22 The phase line current signal is obtained from the phase line current sampling resistor 4; the neutral line current loop is composed of the neutral line 6, the neutral line current flows in from the fourth terminal 24 of the terminal block 2, and flows out from the third terminal 23; the residual current The signal is obtained by the residual current sampling transformer 7.
(应用例) (Application example)
前述实施例的低压配电网剩余电流监测系统,其在使用时,分设于低压配电网各用户侧的可测量剩余电流电能表101工作时,其相线电流采样信号、剩余电流采样信号送到电路装置8,其中相线电流信号用于实时电量计算,剩余电流采样信号用于对用户线路的剩余电流值进行实时监测,定时对低压配电线路中的剩余电流值进行记录。一旦发现用户线路中的剩余电流值超过预置的报警阀值,电能表马上向用户报警,形成剩余电流超限报警事件记录,并及时通过通信信道103(RS485总线或者电力线载波信道)通知后台监测服务器102。后台监测服务器102通过RS485总线或者电力线载波信道读取用户侧的可测量剩余电流电能表101的剩余电流记录和超限报警事件,并对剩余电流超限报警事件进行统计分析,对用户电路中可能发生的剩余电流超限进行预测,并通过通信信道103向本用户可测量剩余电流电能表101发出信息,由该可测量剩余电流电能表101向用户进行提前预警。必要时,后台监测服务器102可远程控制可测量剩余电流电能表101内的继电器3动作,切断用户电流,以预防火灾等恶性事件的发生。 The low-voltage distribution network residual current monitoring system of the aforementioned embodiment, when it is in use, when the measurable residual current watt-hour meter 101 separately located on each user side of the low-voltage distribution network is working, its phase line current sampling signal and residual current sampling signal are sent to To the circuit device 8, the phase line current signal is used for real-time power calculation, the residual current sampling signal is used for real-time monitoring of the residual current value of the user line, and the residual current value of the low-voltage power distribution line is regularly recorded. Once it is found that the residual current value in the user line exceeds the preset alarm threshold, the energy meter will immediately alarm the user, form a residual current over-limit alarm event record, and promptly notify the background monitoring through the communication channel 103 (RS485 bus or power line carrier channel) Server 102. The background monitoring server 102 reads the residual current records and over-limit alarm events of the measurable residual current electric energy meter 101 on the user side through the RS485 bus or the power line carrier channel, and performs statistical analysis on the residual current over-limit alarm events, and detects possible faults in the user circuit. The occurrence of excess current exceeding the limit is predicted, and a message is sent to the user's measurable residual current electric energy meter 101 through the communication channel 103, and the measurable residual current electric energy meter 101 gives an early warning to the user. When necessary, the background monitoring server 102 can remotely control the action of the relay 3 in the watt-hour meter 101 capable of measuring residual current, and cut off the user's current, so as to prevent the occurrence of vicious events such as fire.
以上实施例和应用例是对本实用新型的具体实施方式的说明,而非对本实用新型的限制,有关技术领域的技术人员在不脱离本实用新型的精神和范围的情况下,还可以做出各种变换和变化而得到相对应的等同的技术方案,因此所有等同的技术方案均应该归入本实用新型的专利保护范围。 The above embodiments and application examples are descriptions of specific implementations of the present utility model, rather than limitations of the present utility model. Those skilled in the relevant technical fields can also make various Therefore, all equivalent technical solutions should be included in the patent protection scope of the utility model.
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