Cooling device for secondary over-voltage protector of current transformer

Abstract

The invention relates to a cooling device for a secondary over-voltage protector of a current transformer. The cooling device comprises a shell (1), a wiring terminal (2) is arranged on the shell, the cooling device is characterized in that one side of the shell is connected with a reversion extension plate (1a), a plurality of heat dissipation holes (1b) are arranged on the other three side walls of the shell, the reversion extension plate (1a) is connected with a group of wind wheels (3) in an internal rotation matching way, the wind wheels (3) are connected and matched in a transmission manner through a belt (5) and a belt pulley (6), an electric motor (4) is fixedly connected onto the extension plate (7), and an output shaft of the electric motor (4) is connected and matched with the downmost wine wheel (3) in a transmission manner through the belt (5) and the belt pulley (6). The cooling device has the advantages that the cooling effect is good due to the adoption of gas cooling, and meanwhile, a dryer is adopted in the device to remove humidity, so that the secondary over-voltage protector of the current transformer can work normally.

Description

technical field [0001] The invention relates to the field of current transformers, in particular to a cooling device for a secondary overvoltage protector of a current transformer. Background technique [0002] Existing current transformers (CTs) are widely used in power systems, and they are indispensable components for ammeters, watt-hour meters and current control systems. During normal operation, the secondary overvoltage of the current transformer is in a short-circuit state, and the output voltage is very low. In actual operation, if the secondary winding is open or the primary winding flows abnormal current, such as lightning current, resonant overcurrent, capacitor charging current, inductor starting current, etc., thousands of volts will be generated on the secondary side. Even an overvoltage of tens of thousands of volts will not only cause the current transformer to be overexcited and burn out, but even endanger the safety of the staff. The existing secondary ove...

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Problems solved by technology

In actual operation, if the secondary winding is open or the primary winding flows abnormal current, such as lightning current, resonant overcurrent, capacitor charging current, inductor starting current, etc., thousands of volts will be generated on the secondary side. Even an overvoltage of tens of thousands of volts will not only cause the current transformer to be overexcited and burn out, but even endanger the safety of the staff. The existing secondary overvoltage protector for the current transformer has a large internal power module that generates a lot of heat. Sustained large heat generation will cause the resistance value to increase, so that the temperature rise rate of the power module will rise sharply, which will affect the normal operation of the secondary overvoltage protector of the current transformer. Therefore, a cooling current is needed. The device of transformer secondary overvoltage protector

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