第八单元 英文.pptVIP

Chapter Eight Intelligent watt-hour meter Section 1 Function of intelligent watt-hour meter Section 2 Single-phase intelligent watt-hour meter Section 3 Three-phase intelligent watt-hour meter Section 4 Application of intelligent watt-hour meter Section 1 Function of intelligent watt-hour meter 1.The effect of intelligent watt-hour meter To realize the automation of meter reading,the intelligent watt-hour meter is made，the purpose of which is to collect the data. 2.Classification Pulse watt-hour meter:it is a kind of watt-hour meter that can output pulse string proportional to the turnplate revolutions.According to the ways of producing pulse,it can be classified to voltage pulse watt-hour meter and current ring pulse watt-hour meter. Intelligent watt-hour meter：it conducts remote communication in the way of coding by serial port.Because the signal is not in pulse style，it is very exact and reliable.According to the ways of communicating of output interface,it can be classified to low voltage distribution lines carrier interface and RS485 interface. Section 1 Function of intelligent watt-hour meter 二、The function of intelligent watt-hour meter （1）the Function of measurement： With forward, reverse active electric energy and four-quadrant reactive electric energy metering functions, and includes two types of cumulative measurement and real-time measurement capabilities. （2） Rates and time function： Use of economic leverage, makes electricity tariff peaks and valleys of some differences, at least set the sharp peak, flat, valley four rates, improve power quality and economic efficiency. （3）Maximum demand metering: （4） Measurement function： Measure the phase of active power, reactive power, power factor, phase voltage, phase (including the zero line) current, frequency and other operating parameters （5） Data display function： data displayed in two ways: cycle and fixed display. Display can be set programmatically, and have function of waki