Ground-wire-protection-mode-convertible electric leakage protection plug
A leakage protection plug and protection mode technology, which is applied to emergency protection circuit devices, emergency protection devices with automatic disconnection, circuits, etc., can solve the problems of reducing maintenance rate and maintenance cost, leakage protection plug false tripping, and failure to use normally. , to achieve the effects of saving production costs, ensuring safe electricity use, and solving problems that cannot be used normally
Inactive Publication Date: 2015-10-28
SHENZHEN LONGWAY TECH
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Problems solved by technology
[0006] The object of the present invention is to provide a leakage protection plug capable of switching the protection mode of the ground wire. Selective conversion of the live line protection function, which not only solves the problem that the leakage protection plug cannot be used normally due to false tripping, but also reduces the after-sales maintenance rate and maintenance cost of the product
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[0025] The present invention is described in further detail by the following examples.
[0026] see figure 1 As shown, a leakage protection plug capable of switching the protection mode of the ground wire includes a shell, a pin, the first phase wire 1 and the second phase wire 4, the first neutral wire 2 and the second neutral wire 5, and the first ground wire 3 and the second ground wire 6, the zero-sequence current transformer 17 through which the second phase wire 4 and the second neutral wire 5 both pass, the test circuit 40, the electromagnetic tripping and locking device, the electromagnetic tripping and locking device Buckle device is made up of electromagnetic coil 13 and its drive circuit, phase line contact switch 7, neutral line contact switch 8, ground line contact switch 9, and the drive circuit of described electromagnetic coil 13 is mainly composed of the first rectifier circuit 14, the first 1 SCR 15, a first resistor 10, and an amplifying circuit 16, one out...
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The invention provides a ground-wire-protection-mode-convertible electric leakage protection plug which is composed of a shell, plug pins, phase wires, zero wires, ground wires, a zero sequence current transformer, a test loop, an electromagnetic tripping and latching device, a ground wire fault current detection circuit, a ground wire fault voltage detection circuit, first and second conversion switches and a unidirectional conduction circuit. The two secondary winding output ends of the zero sequence current transformer are connected in parallel with the first and second input ends of an amplification circuit. The unidirectional conduction circuit is connected with the third intermediate input end of the amplification circuit. The output end of a ground wire live detection inductor is connected in series with the second conversion switch and then respectively connected with the control electrode and the cathode of a second silicon controlled rectifier. According to the electric leakage protection plug, a ground wire fault current protection mode and a ground wire fault voltage mode can be selectively converted so that a problem of mis-tripping of the electric leakage protection plug can be solved and electricity utilization is ensured to be safer for people.
Description
technical field [0001] The invention relates to the technical field of electricity safety protection, in particular to an electric leakage protection plug capable of switching the ground wire protection mode. Background technique [0002] Existing leakage protection plugs can be divided into two types of products: ground fault current detection and protection and ground fault voltage detection and protection according to the detection and protection methods for live wires. [0003] Chinese patent document CN1142618C discloses a leakage protection plug capable of detecting ground wire fault current. The leakage protection plug can detect whether there is a fault current in the ground wire when the ground wire is accidentally electrified due to an abnormal ground protection system, and the ground wire fault current reaches When the preset threshold value is reached, it will immediately cut off the phase wire, neutral wire and ground wire. It can be seen from this that as long...
Claims
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IPC IPC(8): H01R13/66H01R13/70H01R13/713H01R13/717H02H3/32
Inventor 谭文兴史泽华
Owner SHENZHEN LONGWAY TECH