Power Quality Management System (PQMS)

Power Quality Management System (PQMS) is a platform and interfaces to collect, tabulate, analysis and display data to various stakeholders.

Power Quality Management System (PQMS)

Power Quality Management System (PQMS) is a platform and interfaces to collect, tabulate, analysis and display data to various stakeholders.

PQ recorders are usually installed at the incoming or power-sensitive locations to monitor and record the status and quality of power supply in the location.

With the data collected by the various field devices, the collected information is further analyze and trended on historical records. Reports such as energy management or performance index reporting can be generated by the system.

Generally, these information are displayed on a friendly user interface for easy viewing. Certain alarm and faults can also be raised for user’s intervention.

General features

To  meet  the  minimum requirements for  a  PQMS, the multimeters should provide:

RMS   operational   and   demand   metering.

Electrical quantities used for operational purposes such as currents, voltages, power, and demand should be measured with high accuracy. Addition- ally, the meter must be able to monitor the con- sumed demand for each feeder.

Revenue metering. As an option for intercon- nections between utilities that use revenue and power quality meters, the following energy read- ings would be available with 0.2 accuracy: active energy, reactive energy, and apparent energy, as well as bidirectional readings of active and reac- tive energy.

Power quality. The multimeters must also provide various measurement quantities that allow power quality monitoring of a circuit in compliance with IEC (International Electrotechnical Commission) standards [1]. The main parameters to be measured and recorded are:

– Voltage sag, swell, and interruption (VSSI)

– Harmonic distortion to the fiftieth order

– Voltage fluctuation

– Voltage unbalance

– Power factor

– Frequency variation

Control functions. The meter should also provide control through contact inputs and outputs and user-programmable logic (with Boolean operation, analog compare, trigger, remote control logic, etc.). This tool is useful for controlling and pro- tecting capacitor banks, transformers, and har- monic filters.

 

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