FAQ n Links

What is kWh Meter?

Any electrical utility, which provides electrical power to its consumers, expects to be fairly reimbursed for this service. To do this a device called an Electric Meter is deployed, that measures customer usage in kilowatt hours. The kWh meter, i.e., killowatthour meter must accurately measure voltage, current and power factor continuously over a period of time to arrive at killowatthours.

Killowatthours = Watts x Hours / 1000

Differentiate Single Phase, Polyphase and Three Phase Meters?

Single Phase Meter An Electricity Meter consisting of one metering element and used to eter Single Phase services such as a residential service is known as Single Phase Meter.
Polyphase Meter An electricity meter used for polyphase service power measurement. It may have 2, 2 ½ or 3 metering elements either self-contained or transformer rated type.
Three Phase Meter A polyphase meter having 3 metering elements are referred as Three Phase meters

What is meant by Phantom Loads?

During meter testing, it is easy to obtain the desired test voltage from the power line. However it is difficult to generate desired test current because different current values are required, depending upon the current rating of the meter under test.
A phantom load is used for this purpose. It basically consists of a special loading transformer that steps the line voltage to a lower value, which is then applied through loading resistors (different values for different currents) to the meter under test to produce current. This concept is used by the Meter manufacturers for both portable phantom load set ups and test benches.

What is a DSP?

DSPs (Digital Signal Processors) are processors whose hardware, software and instruction sets are optimized for high-speed numeric processing applications-an essential for processing digital data representing analog signals in real time.