Patent ID: 6711512
Filing Date: 2004-03-23
Classification: H02H

Abstract:
A power distribution line pole transformer load monitoring system using a wireless Internet network, comprising:phase current detection means for detecting current of each phase flowing through a secondary coil of a pole transformer; phase voltage detection means for detecting a voltage of each phase induced in the secondary coil of the pole transformer; internal temperature detection means for detecting an internal temperature of a system body; external temperature detection means for detecting an external temperature of said pole transformer; an analog/digital converter for converting the phase current detected by said phase current detection means, the phase voltage detected by said phase voltage detection means, the internal temperature detected by said internal temperature detection means and the external temperature detected by said external temperature detection means into digital signals; a microprocessor for performing an arithmetic operation for digital phase current, phase voltage, internal temperature and external temperature data from said analog/digital converter and controlling the an entire operation of the system; a flash read only memory for sequentially storing phase current, phase voltage, internal temperature and external temperature values measured as a result of the arithmetic operation of said microprocessor; a watchdog for monitoring from periodic output signals from said microprocessor whether said microprocessor operates normally and outputting a reset signal to said microprocessor and flash read only memory upon determining that said microprocessor does not operate normally; a buffer for buffering an address signal from said microprocessor; a random access memory for storing output data from said microprocessor in its location corresponding to the address signal buffered by said buffer; a modem for receiving an output signal from said microprocessor, transmitting the received signal to a central control station via a base station and the Internet network, receiving a control signal transmitted from the central control station and transferring the received control signal to said microprocessor; indication means for providing a visual indication of the transmission of the output signal from said microprocessor via said modem and a visual indication of the reception of the control signal from said central control station by said microprocessor; and an alternating current (AC)/direct current (DC) converter for converting an AC voltage applied between any one of three phases of said pole transformer and a neutral line into a DC voltage of a certain level and outputting the converted DC voltage as an operating voltage.