CN204669079U - A kind of safety control for resident's distribution - Google Patents

Abstract

The utility model relates to a monitoring and protection technology for the safety of residents' electricity use, mainly an intelligent monitoring and protection device for the safety of residents' electricity use, in particular a safety control device for residents' electricity distribution. The utility model monitors the residual current and load of the user circuit, and when the value of the load current and the residual current exceeds the limit value of the device, the device automatically cuts off the circuit and sends an alarm message. When the circuit is disconnected due to excessive residual current, the device will restore power to each branch circuit in turn. Once the residual current is too large, it can be determined that the branch circuit that has just been restored has leaks, cut off the circuit, and check in sequence , restore the power supply to the circuits without problems, ensure the normal power supply of the residents and realize the positioning maintenance, the utility model sends the alarm information to the mobile phone of the remote user through the WiFi communication, and the device can ensure the safety of the residents' electricity consumption.

Description

A safety control device for residential power distribution

technical field

The utility model relates to monitoring and metering technology for residents' electricity safety, mainly an intelligent monitoring and protection device for residents' electricity safety. The device can monitor the load current, residual current, voltage loss, Overvoltage and other safety conditions, and set the power-off and closing of the intelligent control circuit according to the limit value, and has the ability of remote management to ensure the safety and reliability of residents' electricity consumption.

Background technique

At present, most residents have a small distribution box in their homes. The power line is divided into several branches through this distribution box with a circuit breaker to distribute power to lighting, air conditioners (electric water heaters), refrigerators, and sockets in each room. , Computers, electric water heaters, refrigerators and other home appliances have a large number and consume a lot of electricity, so overload and power trip problems often occur.

In many old residential buildings, due to the aging of the wires buried in the wall, single-phase grounding faults of the wires are prone to occur, such as single-phase disconnection, wires lapped to the grounding body, and most of the fault phenomena are hidden, because the wires The insulation resistance of the insulating layer is unqualified, and leakage current is generated due to too small insulation resistance. When the leakage current flows concentratedly into a large place (grounding body), high heat will occur. Once there is flammable material flowing into a large place, it will burn due to high temperature. The leakage current of the wire is generally at the mA level, and the overcurrent protection (overload protection and short circuit protection) of the line cannot operate to play a protective role. It will cause fire prevention and electrical safety problems. If the zero line entering the house is burned out and the voltage is unstable, it will easily cause the electrical appliances in the residents' homes to be burned.

Contents of the invention

A safety control device for residential power distribution, the structure of which includes a measurement unit, an MCU control unit, a shunt, a touch screen display unit, a WiFi communication unit, a residual current protection unit, and a magnetic latching relay. It is characterized in that the measurement unit and the residual current protection unit are respectively connected to the MCU control unit, each branch shunt is also connected to the MCU control unit, and the MCU control unit can respectively control each magnetic latching relay through the relay drive circuit, and the MCU control unit is connected to the MCU control unit. The WiFi communication unit realizes the network transmission of the system, and the MCU control unit is connected to the touch screen display unit to realize status display and parameter setting.

A safety control device for residential power distribution, characterized in that the residual current protection unit uses a Rogowski coil to detect the residual current, and the residual current information detected by the Rogowski coil is transmitted to the MCU control unit, and the MCU control unit and the internally stored setting limit Value comparison, if the limit value is exceeded, the control command will be sent to the magnetic latching relay to cut off the circuit to protect personal safety.

The utility model monitors the user's total entrance line, collects all the electrical parameters of each branch line in real time, and can set alarm limits for each parameter, and the load exceeds the limit, and the value of the leakage current exceeds the limit. Alarm, and can automatically cut off the circuit.

The utility model adopts the touch screen to operate the man-machine interface, realizes the communication with the touch screen and the control of each branch measurement module and the total measurement module through the MCU.

The utility model uses a manganin shunt to sample the current of each branch. The maximum current of the shunt can reach 60 amps, and then through resistance current limiting, capacitor filtering, phase shifting, and finally sent to the metering unit.

The utility model simultaneously receives the signal of the multi-channel shunt through the P1 port of the MCU at the same time, collects the current data amount, and compares it with the total current amount of the metering chip. If the error is greater than 2%, this will send out an alarm message.

The utility model adopts single-phase double-current sampling electric energy metering chip HG7211 to monitor the total circuit, and obtain all electrical parameters, including current, voltage, active power, apparent power, phase angle and frequency.

The utility model adopts the residual current detection ability, which can prevent personal electric shock, electric fire and damage to electric equipment.

The utility model uses a magnetic holding relay to automatically switch and control each branch respectively, and the magnetic holding relay is small in size, high in reliability, strong in cutting off current, and low in power consumption.

Description of drawings

Fig. 1 is a functional block diagram of the utility model.

Detailed ways

1. Measuring unit: complete the testing and storage of all electrical parameters by sampling the residential power lines, and send parameters such as current, voltage, power, electric energy, and frequency to the MCU control unit;

2. The touch screen is a man-machine interface, which realizes setting of various limit values, setting of alarm information, and reading of various power consumption data;

3. The current data acquisition circuit, the current sampling value of each branch enters the different IO ports of the MCU control unit through A/D conversion, the current of each branch is multiplied by the input voltage to obtain the power and power consumption, and the current and Comparing the limit value, if it is found to exceed the part, it will call the police;

4. Residual current protection function. This utility model penetrates the zero and live wires of the incoming power line into a current transformer at the same time to detect the magnitude of the residual current. Under normal circumstances, the current transformer has no induction output. When there is a leakage, the live wire and the ground wire form a loop , at this time, there is no or very small current in the neutral line, and the current is compared with the rated protection current of the MCU control unit. If the limit value is exceeded, a disconnection command will be sent and an alarm message will be displayed;

5. The MCU control unit is the core, which mainly analyzes and processes the current data of the branch circuit, controls the magnetic latching relay to manage the load, and at the same time performs necessary monitoring and energy management on the main incoming power line and branch circuit, and at the same time receives the transmission from the touch screen The instruction implements parameter setting;

6. Communication unit: mainly to receive user instructions through the WIFI network, automatically send alarm information to users, and realize user access to home power distribution conditions, such as load status, energy consumption, voltage fluctuations, etc.

The utility model establishes an intelligent power distribution automation system for the existing residents' household electricity consumption, which improves the level of safety and reliability, eliminates fire safety accidents caused by electrical reasons, and can remotely control the power supply of each branch through the system, thereby realizing Home Energy Efficiency Management.

Claims (2)

1. A safety control device for residential power distribution, its structure includes a measuring unit, an MCU control unit, a shunt, a touch screen display unit, a WiFi communication unit, a residual current protection unit, and a magnetic latching relay part, characterized in that The measuring unit and the residual current protection unit are respectively connected to the MCU control unit, and each branch shunt is also connected to the MCU control unit. The MCU control unit can respectively control each magnetic latching relay through the relay drive circuit, and the MCU control unit is connected to the MCU control unit. The WiFi communication unit realizes the network transmission of the system, and the MCU control unit is connected to the touch screen display unit to realize status display and parameter setting. 2. A safety control device for residential power distribution according to claim 1, characterized in that the residual current protection unit uses a Rogowski coil to detect residual current, and the Rogowski coil transmits the detected residual current information to the MCU The control unit is compared with the set limit value stored in the MCU control unit, and if the limit value is exceeded, the control command is sent to the magnetic latching relay to cut off the circuit.