Residual-current cancellation method and electric leakage protection device thereof
A leakage protection device and residual current technology, applied in emergency protection circuit devices, emergency protection devices with automatic disconnection, circuit devices, etc., can solve the problem of reducing personal electric shock accidents, equipment safety and effective protection, failure to protect, and affecting the reliability of normal power supply To prevent personal electric shock accidents and equipment safety, eliminate impact, and improve reliability
Active Publication Date: 2016-07-20
袁月春
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Problems solved by technology
[0002] The existing "leakage protection device" generally adopts the principle of residual current. Its disadvantage is that with the lengthening of the line or the increase of electrical appliances used, the normal residual current in the line will increase. When the normal increase of residual current is greater than that of the leakage protection device When the threshold value is reached, the leakage protection device trips and cuts off the power. This false trip phenomenon seriously affects the reliability of normal power supply. If the leakage protection threshold is increased, the effective protection against personal electric shock accidents and equipment safety will be reduced, or even unable to protect
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[0025] Below in conjunction with accompanying drawing, the present invention is described in further detail:
[0026] Such as figure 1 As shown, the dotted line indicates a certain line node in the low-voltage power distribution line. The left side of the dotted line is the front stage of the line node, which is the power supply side, and the right side of the dotted line is the subsequent stage of the line node, which is the load side. In the figure, the low-voltage line The arrow on is the flow direction of the remaining current, and the arrow on the current source module is the flow direction of the offset current;
[0027] Such as figure 1 and figure 2 As shown, according to an embodiment of a residual current offset method provided by the present invention, the following steps are included,
[0028] When the subsequent stage of the line node generates residual current, the residual current will be superimposed on the previous stage of the line node;
[0029] Install ...
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The invention provides a residual-current cancellation method, which comprises the steps that: when a residual current is generated by a following stage of a line node, the residual current is superposed to a preceding stage of the line node; a current source module is installed at the line node, one end of the current source module is connected to a neutral point of a power distribution transformer through a lead wire or the ground, and the neutral point is connected with the other end of the current source module through a null line; and a current of the current source module and the residual current are equivalent in magnitude and opposite in phase, the current of the current source module and the residual current are cancelled at the preceding stage of the line node, thereby eliminating superposition of the residual current at the following stage of the line node on the preceding stage of the line node. The residual-current cancellation method provided by the invention has the beneficial effects of being capable of completely cancelling the normal residual current on a line, and eliminating the influence of the normal residual current on the electric leakage protection device, thereby increasing sensibility of the electric leakage protection device, and reducing incorrect tripping rate of the electric leakage protection device.
Description
technical field [0001] The invention relates to a residual current offset method, and also relates to a leakage protection device using the residual current offset method. Background technique [0002] The existing "leakage protection device" generally adopts the principle of residual current. Its disadvantage is that with the lengthening of the line or the increase of electrical appliances used, the normal residual current in the line will increase. When the normal increase of residual current is greater than that of the leakage protection device When the threshold is reached, the leakage protection device trips and cuts off the power. This false trip phenomenon seriously affects the reliability of normal power supply. If the leakage protection threshold is increased, the effective protection against personal electric shock accidents and equipment safety will be reduced, or even impossible. Contents of the invention [0003] The technical problem to be solved by the prese...
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IPC IPC(8): H02H3/33
CPCH02H3/331
Inventor 袁月春
Owner 袁月春