Self-powered switching-on instantaneous protecting device

Abstract

The invention discloses and provides a self-powered switching-on instantaneous protecting device. According to the self-powered switching-on instantaneous protecting device, a current transformer (CT), a power circuit, a battery, a boosted circuit, an energy-storage capacitor and a closing coil are added on an ordinary self-powered microprocessor protecting device, wherein the current provided by the CT is rectified to a direct current by the power circuit and then is provided for the energy-storage capacitor after passing through the boosted circuit and serves as the power supply of the closing coil, a normally open contact of a relay is connected in a power supply circuit of the closing coil in series, and the battery serving as a back-up power supply is charged when the CT obtains power and does not consume electric energy when the CT losses power. Therefore, the self-powered switching-on instantaneous protecting device does not need auxiliary power supplies and does not need to be supplied with power independently, protecting accuracy is high, definite value setting is convenient, and switching-on instantaneous protecting is achieved. The self-powered switching-on instantaneous protecting device can be widely applied to transformer substations which are located in remote areas and in which working environment is poor and no direct current or alternating current stabilified-voltage power is supplied externally.

Description

technical field [0001] The invention relates to a self-supply fast closing instant protection device. Background technique [0002] With a large number of on-site practical applications of self-powered microcomputer protection devices, according to the different voltages of switchgear operating mechanisms, self-powered microcomputer protection devices are subdivided into different categories such as 220V, 48V, and 24V. They are also different. The self-powered microcomputer protection device with 220V operating mechanism releases the pulse voltage from the energy storage capacitor, while the self-powered microcomputer protection device with 48V and 24V operating mechanism is driven by the backup battery inside the device. [0003] The user found on site that the self-powered microcomputer protection device applied to the 220V operating mechanism has the problem of a long fault exit time at the moment of closing (the internal energy storage capacitor of the device is charged...

AI Technical Summary

Problems solved by technology

Because they do not need auxiliary power supply, they are very suitable for installation in self-configured intermediate transformation stations, regional substations and distribution stations; they are widely recognized by users because they do not need a separate power supply, high protection accuracy and convenient setting; at the same time, the original 220V operating mechanism The export time of the self-powered microcomputer protection device is relatively long (about 3S). The main reason is that although the self-powered microcomputer protection device detects a fault and exits quickly, the internal energy storage capacitor of the device that drives the operating mechanism is charged to 250V takes a long time, so it cannot protect in time when the device closes and fails instantly. This defect needs to be solved and overcome in time

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