Plug with ground wire live protection mechanism
A technology of protection mechanism and ground wire electrification, which is applied in the direction of connecting parts to protect grounding/shielding devices, circuits, electrical components, etc., which can solve problems such as current false tripping, complicated current, and failure to trip protection, so as to prevent false actions and false alarms Effect
Active Publication Date: 2017-11-17
钱加灿
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Problems solved by technology
[0004] However, the above-mentioned all-round leakage protection plug also has the following disadvantages: 1. When the zero-sequence transformer on the ground is used to detect the current, the current on the user's ground is very complicated, and it is easy to generate current between the ground and cause false tripping
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[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0020] Such as figure 1 As shown, the plug with the protection mechanism of the ground wire includes three poles of the phase line L, the neutral line N, and the ground line E with the switch K, the zero-sequence current transformer ZCT2 passing through the phase line L and the neutral line N, and the test circuit R3, K1, release, rectifier circuit D1-D4, SCR SCR2 are the original leakage protector circuit, zero-sequence current transformer ZCT2 directly pushes the SCR SCR2 through the release L1 to trigger the action of the release. Linkage switches S1 and S2 act, adding a transformer ZCT1, amplifier circuit IC and another thyristor SCR1, drop-down resistors R1, R2, induced voltage elimination capacitor C1, and electrified alarm neon bulb H to the original leakage protection circuit.
[0021] One end of the primary coil of the transformer ZC...
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Plug with live protection mechanism for ground wires, including three poles of phase wire L, neutral wire N, and ground wire E with switches, zero-sequence current transformers passing through phase wire L and neutral wire N, test circuit, and release , a rectifier circuit, a thyristor, and a transformer, an amplifying circuit, and another thyristor. One end of the primary coil of the transformer is connected to the ground wire E, and the other end of the primary coil of the transformer is connected in series with a large-resistance current-limiting step-down circuit. It is connected to the neutral line N, the secondary coil of the transformer is connected to the input terminal of the amplifier circuit, the output terminal of the amplifier circuit is connected to the trigger pole of another thyristor, and the other thyristor controls the action of the release. It can ensure that the trip voltage of the ground wire is not greater than the safe voltage, and prevent the plug from malfunctioning and false alarm due to the induced voltage in the ground wire.
Description
technical field [0001] The invention relates to a live protection device, in particular to a ground wire live protection device. Background technique [0002] Existing plugs with live protection devices for ground wires, such as all-purpose leakage protection plugs, generally mean that the protection device (plug) can be disconnected when there is leakage in the phase and neutral wires, and it can also be disconnected when the ground wire is charged. It generally includes the phase, zero and ground three poles connected by the moving contact elastic sheet and the static contact, the zero-sequence current transformer passing through the phase and the neutral line, the test circuit, the amplifier circuit, the rectifier, the thyristor, the disconnector Buckle, zero-sequence current transformer passing through the ground wire, in addition to detecting whether there is leakage current between the load phase and neutral wire, it also detects whether there is leakage current throug...
Claims
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IPC IPC(8): H01R13/66H01R13/648
Inventor 钱加灿
Owner 钱加灿