Omnipotence safety plug

Abstract

An all-function safety plug comprises a phase pole, a zero pole, a ground pole, a zero sequence current mutual inductor, a test loop, an amplifying circuit, a direct-current power supply, a controlled silicon, and a release; the phase pole, the zero pole and the ground pole are provided with switches; the zero sequence current mutual inductor is arranged between a phase line and a zero line; a ground wire is connected with a static contact by a movable contact elastic trip; the zero sequence current mutual inductor passes through the ground wire; the output end of the zero sequence current mutual inductor in the ground wire is connected with a capacitor and a resistor in parallel; one output end of a ground wire mutual inductor is connected with the triggering electrode of another controlled silicon, while the other output end of the ground wire mutual inductor is connected with the cathode of a rectification circuit; and the anode and the cathode of the controlled silicon is connected with the anode and the cathode of the rectification circuit. The plug has the advantages that by another controlled silicon, even if the ground wire is electrified unexpectedly under the condition that the controlled silicon between the phase line and the zero line or the amplifying circuit are in failure, the power supply can still be immediately cut off, thereby stably and reliably preventing the ground wire to be electrified, and ensuring the personnel safety of users. Furthermore, the zero sequence mutual inductor between the phase line and the zero line does not interfere with the zero sequence mutual inductor of the ground wire, so that the reliability is good. In addition, the cost is saved.

Description

technical field [0001] The invention relates to a power plug, in particular to an all-round safety plug capable of electrifying fireproof wires, neutral wires and ground wires. Background technique [0002] The existing all-round leakage protection plug is equipped with a live detection sensor for the ground wire in the ground wire of the power line, and a zero-sequence current transformer is provided between the phase and neutral wires, and the internal phase, zero, and ground wires of the plug are connected to the breaker. There is a pair of contacts between them, and a spring is connected between the upper end of the breaker and the copper reed of the moving contact of the ground wire, so that there is always a spring force of mutual attraction between the pair of contacts of the ground wire, which is realized when the free tripper operates. Connect the ground wire first, then connect the phase and neutral wires or disconnect the phase and neutral wires first, and then di...

AI Technical Summary

Problems solved by technology

[0002] The existing all-round leakage protection plug is equipped with a live detection sensor for the ground wire in the ground wire of the power line, and a zero-sequence current transformer is provided between the phase and neutral wires, and the internal phase, zero, and ground wires of the plug are connected to the breaker. There is a pair of contacts between them, and a spring is connected between the upper end of the breaker and the copper reed of the moving contact of the ground wire, so that there is always a spring force of mutual attraction between the pair of contacts of the ground wire, which is realized when the free tripper operates. Connect the ground wire first, then connect the phase and neutral wires or disconnect the phase and neutral wires first, and then disconnect the ground wires to meet the requirements for safe electricity use, but there are the following disadvantages: 1. The zero-sequence mutual inductance coil of the phase and neutral wires appears In the event of a fault, such as disconnection, the zero-sequence mutual inductance coil of the ground wire cannot function, so it cannot achieve the purpose of cutting off the ground wire in time when it is charged.

2. Since the zero-sequence mutual induction coil on the ground wire and the zero-sequence mutual induction coil on the phase line and zero line are connected to the input terminal of the same amplifier, the output voltage of the zero-sequence mutual induction coil on the ground wire is affected, thereby affecting the ground The operating current of the ground wire makes the operating current when the ground wire leaks electricity exceed the safe current that the human body can bear, so it cannot play a protective role and will still endanger human life.

[0003] There is also an all-round safety plug, the secondary output terminal of the zero-sequence current transformer in the ground wire is connected in parallel with another amplifying circuit, and the output terminal of the other amplifying circuit is connected in series with a diode and connected to the trigger pole of the thyristor , the output end of the original amplifier circuit is connected in series with a diode and then connected to the trigger pole of the thyristor. Although this can ensure the independent work between the two zero-sequence mutual inductance coils, the design of the PCB board is more complicated. In addition, the use of two sets of amplifier circuits is also increased cost

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