CN201549869U - Zero line disconnection protection control circuit - Google Patents

Abstract

The utility model discloses a zero line disconnection protection control circuit, comprising a voltage signal acquisition module, a rectification module, a voltage stabilization module, a monitoring and analysis module, a logic comparison module, an intelligent output module, a voltage signal acquisition module, a rectification module, a voltage stabilization module The module and the intelligent output module are electrically connected in sequence, and at the same time, the voltage signal acquisition module, the monitoring and analysis module, the logic comparison module and the intelligent output module are electrically connected in sequence. The utility model is applicable to the protection of phase breakage, neutral line breakage, line short circuit, overvoltage, etc. in urban power distribution lines, and has the characteristics of reasonable circuit design, precise control and protection, and good safety performance.

Description

Zero line disconnection protection control circuit

technical field

The utility model relates to a power distribution line protection control circuit.

Background technique

In a three-phase four-wire power line, the function of the neutral line is to ensure that the impedance on the neutral line is zero when the three-phase load is asymmetrical, so as to eliminate the neutral point displacement and keep the voltage of each phase symmetrical. After the circuit is broken for some reason, when the three-phase load is asymmetrical, the neutral point of the transformer will be displaced, resulting in an unbalanced three-phase voltage, that is, some phase voltages are too high, which may burn electrical equipment and threaten the safety of electrical equipment. If the phase voltage is too low, the electrical equipment cannot be used normally. At this time, if a person touches the broken neutral wire, the current will flow through the human body, threatening the safety of human life.

Contents of the invention

In order to solve the harm to the human body and equipment caused by the breakage of the zero line of the three-phase four-wire system, the utility model provides a protection control circuit for the breakage of the zero line, and the technical scheme adopted is as follows:

The circuit includes a voltage signal acquisition module, a rectification module, a voltage stabilization module, a monitoring and analysis module, a logic comparison module, and an intelligent output module. The module, the monitoring and analysis module, the logic comparison module and the intelligent output module are electrically connected in sequence.

The circuit also includes an overvoltage alarm module and an undervoltage alarm module electrically connected to the intelligent output module.

When the zero line is disconnected, the circuit can control the power-off protection of the power line, and give an alarm to the line overvoltage and undervoltage, effectively preventing the harm to the person and equipment caused by the zero line disconnection. The utility model is applicable to urban The protection of phase breakage, neutral line breakage, line short circuit, overvoltage, etc. in the network distribution line has the characteristics of reasonable circuit design, precise control and protection, and good safety performance.

Description of drawings

Fig. 1 is the circuit principle block diagram of the present utility model;

Fig. 2 is a circuit diagram of an embodiment of the utility model.

Detailed ways

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

As shown in Figure 1, the voltage signal acquisition module, rectification module, voltage stabilization module and intelligent output module are electrically connected in sequence, while the voltage signal acquisition module, monitoring and analysis module, logic comparison module and intelligent output module are electrically connected in sequence, and the intelligent output module is electrically connected Connect the overvoltage alarm module and the undervoltage alarm module. The voltage signal acquisition module collects the three-phase four-wire voltage signal, rectifies it through the rectification module and stabilizes the voltage with the voltage stabilization module, and then enters the intelligent output module. At the same time, the voltage signal is analyzed and processed by the monitoring analysis module and compared with the signal set by the logic comparison module. The compared signal enters the intelligent output module. When the collected voltage signal deviates from the allowable range of the set voltage signal, the intelligent output module outputs a control signal to cut off the power of the line, and sends an alarm through the overvoltage alarm module and undervoltage alarm module. Identify the disconnection of the neutral line and cut off the power in time, effectively protect the single-phase load, and avoid burning and the resulting fire.

As shown in Figure 2, when the phase-to-line voltage in the three-phase four-wire system has an overvoltage phenomenon, the voltage regulator tube is broken down and turned on, so that the light-emitting diode in the photocoupler emits light, so that the light-emitting diode in the photocoupler When it emits light, the base of the triode is electrically turned on, so that the relay J acts to cut off the line, and at the same time, the light-emitting diode LED emits light to give an alarm, and finally realizes the purpose of protecting and controlling the line after the neutral line is broken.

Claims (2)

1. a neutral line break is protected control circuit; comprise voltage signal acquisition module, rectification module, Voltage stabilizing module, monitoring analysis module, logic comparison module, intelligent output module; it is characterized in that: voltage signal acquisition module, rectification module, Voltage stabilizing module and intelligent output module are electrically connected successively, and voltage signal acquisition module, monitoring analysis module, logic comparison module and intelligent output module are electrically connected successively simultaneously.

2. neutral line break protection control circuit according to claim 1, it is characterized in that: this circuit also comprises over voltage alarm module and the undervoltage warning module that is electrically connected with intelligent output module respectively.

Images