Zero-break protection and grounding universal self-test single-phase three-pole conjoined plug socket

Abstract

The invention relates to a zero protection and grounding general self-inspection single-phase three-pole integrated socket. Zero protection is characterized in that a resistor is connected onto a zero line and a ground line of the single-phase three-pole integrated socket in a crossing mode, and the resistor is controlled by a selective switch. When an external power supply line has the problem that the zero line is disconnected or connected with a live line in an overlapping mode, and current of the resistor connected between the zero line and the ground line rises to a certain value, a user leakage protector is tripped out immediately, and electric devices of a user are effectively protected from damage. The grounding general self-inspection single-phase three-pole integrated socket is characterized in that the zero protection selective switch, safety self-inspection indicators and a test button are installed on the socket, if an indicator SD2 and an indicator SD3 light simultaneously, the position of the live line L1 is correct, otherwise, line connection errors exist, and the socket can only be used after the errors are removed. The socket has the advantages of being simple in circuit, low in cost, convenient to operate and has practical value.

Description

technical field [0001] The invention relates to the field of safe power supply, safe power use, grounding detection and zero-off protection of low-voltage power supply systems, in particular to a single-phase three-pole conjoined plug socket for universal self-testing of zero-off protection and grounding. Background technique [0002] There is zero disconnection in the power supply system, especially the sudden disconnection of the zero line of the three-phase four-wire power supply in residential areas. When the load of the three-phase live wire is seriously unbalanced, the voltage of some households will suddenly rise to more than 250V or even reach about 400V, or If the zero line breaks on a certain phase line of fire, a large number of household appliances will be burned. Once a similar accident occurs, there is no effective protection measure; at present, a large number of single-phase three-pole plug sockets are used in urban and rural residences or industrial and minin...

AI Technical Summary

Problems solved by technology

[0002] There is zero disconnection in the power supply system, especially the sudden disconnection of the zero line of the three-phase four-wire power supply in residential areas. When the load of the three-phase live wire is seriously unbalanced, the voltage of some households will suddenly rise to more than 250V or even reach about 400V, or If the zero line breaks on a certain phase line of fire, a large number of household appliances will be burned. Once a similar accident occurs, there is no effective protection measure; at present, a large number of single-phase three-pole plug sockets are used in urban and rural residences or industrial and mining enterprises. , Some families or enterprises have low safety awareness, house decoration and new equipment installation are not grounded or the ground wire does not meet the safety requirements, which will eventually lead to personal injury and death. How to find and detect the safety hazards of electrical equipment is currently lacking in simplicity effective means and methods

For example, the simplest 220-volt single-phase three-pole socket, because the existing socket is an electric shock-proof socket with small gaps and baffles, it is difficult to insert the test pencil or the needle of the multimeter, and it is impossible to visually confirm the existence of the ground wire. , there is an urgent need for a simple grounding universal self-test plug socket to judge the safety of electrical equipment and the reliability of the grounding system, so as to eliminate potential safety hazards and prevent accidents.

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