IEEE 3001.8-2013 pdf free.IEEE Recommended Practice for the Instrumentation and Metering of Industrial and Commercial Power Systems.
For the purposes of this document, the following terms and definitions apply. The IEEE Standards Dictionary Online should be consulted for terms not defined in this clause.
instrument: An instrument is defined as a device for measuring the value of the quantity under observation. This value is not reflective of, or related to, any other electrical characteristic of the power system. (Said another way, a volt-meter reading is not in any direet way ffected by other variables in the power system such as current or power factor.) Instruments may be either indicating type or recording type.
As used in this document, an indicating instrument means the value can be read for any given instant, but there is no method for knowing any of the prior values. Recording instruments, on the other hand, allow one to learn the instantaneous value and the prior values of the variable. Common recording methods include digital memory within the instrument itself, transmission of the values to remote computers via a communication link, and/or paper charts.
meter: A meter is defined as a device that can measure and register the integral of a quantity over an interval of time. Integral in this sense means that muliple values of the power system quantity are used to register the value being monitored. The kilowatt-hour meter is the most common type of meter. Such a meter integrates the instantaneous values of voltage, current, and power factor to calculate the kilowatts being consumed, and that value over time results in kilowatt-hour consumption values. (It should be noted that many kilowatt-hour meters are often configured to also register the maximum demand values scen by the meter since its last reset)
NOTE – In common usage, instrument and meter are often used interchangeably. For example, the term meter is commonly used with other words, such as VAR-meter, voltmeter, and frequency meter, even though these devices are technically instruments.
3. Examples of service instrumentation and metering
Below are several examples of the metering that may be installed on an industrial or commercial service entrance.
NOTE -These examples do not, however, ncessrily represent the metering schemes used by the utilities for biling.The utilities often utilize meter types that can handle currents of 200 A, or more, without need for current transformers.IEEE 3001.8 pdf free download.