Page 2 Theory of Operation 2. Page 4 failure and CT open are also indicated instantaneously. Forward Wh 2. Reverse Wh 3. Forward VArh 4.
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Voltages of all the phases Currents of all the phases Power factor of all the phases Principle of Operation: The principle of operation of trivector energy meter is explained with the help of block diagram.
It mainly consists of the following units. Energy measuring unit: voltage sampling, current sampling, measuring integrated circuit An analogue to digital converter is used to sample voltage and current relative to incoming waveform. For getting accurate results the sampling rate should be high. Major Components of Trivector Meter: 1. Maximum Demand Registers: Maximum Demand is indicated for a particular time period. The demand is monitored during each demand interval and the maximum value of these demands is stored in the Maximum Demand register.
Whenever MD is reset, the registered MD value gets stored along with date and time of its occurrence. TOD Registers: These are used to support Time-of-Day metering, means to divide a day into certain time slots with tariff rates arranged in such a way so as to encourage consumers to reduce consumption during high demand hours and shift it to lower demand.
Connection Diagram: Current Transformer and Potential Transformer operated 3-phase 3 wire trivector meters and 3-phase 4 wire trivector meters are available. The connection diagram for 3-phase 4 wire meter is as shown in figure below.
Working of Trivector Meter:
LARSEN & TOUBRO LIMITED, MYSORE WORKS ER300P-PRIDE Manual
Three Phase Whole Current Trivector Energy Meter