Alarming device for the electrification of a current transformer secondary circuit
A technology of current transformer and secondary circuit, which is applied in the direction of indicating the existence of current/voltage, etc. It can solve the problems of endangering the safe operation of the power grid, endangering personal safety, protection misoperation and tripping, etc., and achieves improved operation safety and significant economic benefits and the effect of social benefits
Active Publication Date: 2015-11-25
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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Problems solved by technology
[0002] It is strictly forbidden to open the secondary circuit of the current transformer when it is running with electricity. Once the secondary circuit of the current transformer with live operation is disconnected by mistake due to work mistakes, it will cause the secondary winding to generate a high voltage of several thousand volts and endanger personal safety. For the current transformer used for differential protection in power equipment, once the secondary circuit is open, it is likely to cause serious accidents such as protection malfunction and tripping, endangering the safe operation of the power grid
However, in field operations, accidents in which personnel mistakenly disconnect the secondary circuit of the current transformer often occur. The prior art lacks a device that can directly warn the charged state of the secondary circuit of the current transformer, which has led to such accidents. one of the reasons why
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[0019] See attached figure 1 , This is a schematic diagram of an embodiment of the present invention. Including an open-close current transformer 1, a voltage doubler rectifier circuit 2 and a self-flashing light-emitting diode 3. The secondary side of the open-close current transformer 1 is connected to the AC input end of the voltage doubler rectifier circuit 2, and the DC output of the voltage doubler rectifier circuit 2 The terminal is connected with the power terminal of the self-flashing LED 3. The AC input end of the voltage doubler rectifier circuit 2 can also be connected in parallel with an overvoltage protector 5.
[0020] When the present invention is used, the open-close current transformer 1 is clamped on the secondary circuit of the current transformer in the secondary panel cabinet, especially the panel cabinet with a large number of circuits and easy to be confused. If the secondary circuit is electrified, the secondary circuit The surrounding alternating magne...
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The invention relates to an alarming device for the electrification of a current transformer secondary circuit. The device comprises a split-core current transformer (1), a double rectifying circuit (2) and a self-flashing-and-shining diode (3). The secondary winding (4) of the split-core current transformer (1) is connected with the alternating current inputting end of the double rectifying circuit (2); the direct current inputting end of the double rectifying circuit (2) is connected with the self-flashing-and-shining diode (3). Compared with the prior art, the alarming device provided by the invention greatly improves the safe running of secondary power equipment.
Description
Technical field [0001] The invention relates to an electric safety warning device, in particular to a live warning device for a secondary circuit of a current transformer. Background technique [0002] It is strictly forbidden to open the secondary circuit of the current transformer during live operation. If the secondary circuit of the current transformer is disconnected by mistake due to a work error, it will cause the secondary winding to generate thousands of volts and endanger personal safety. For the current transformer used for differential protection in power equipment, once the secondary circuit is open, it is likely to cause a serious accident of protection malfunction and tripping, endangering the safe operation of the power grid. However, in field operations, accidents often occur when personnel accidentally disconnect the secondary circuit of the current transformer. The prior art lacks a device that can directly warn the charged state of the secondary circuit of the...
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Inventor 周徐达徐广鹦刘志龙黄致远刁冠勋刘志英
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO