Power Meters & Power Quality

Power meters and power quality equipment measure what a plant consumes and correct the way it draws power, which lowers utility bills and protects equipment. Seven Star LLC, an independent supplier in Muscat, supplies meters, power factor controllers, compensators, filters and reactors from Schneider Electric, Circutor, Lumel, Selec and Enerdis to panel builders, facilities and industrial plants in Oman and the GCC.

Types of equipment in this category

Multifunction power meters such as the Schneider Electric PowerLogic PM5560, EasyLogic PM2000, Lumel N14 and ND20 and Selec MFM384 show voltage, current, power, energy and harmonics and send data over RS-485 Modbus or Ethernet. DIN-rail energy meters like the Schneider Electric iEM3255 and Selec EM4M serve sub-metering of feeders and tenants, and power quality monitors such as the Enerdis ENERIUM 300 record disturbances. Power factor controllers from Circutor, Lumel and Selec switch capacitor steps; Circutor OPTIM hybrid var compensators and active harmonic filters correct fast-changing loads and harmonics from drives. Line reactors protect drives and the supply, and transducers convert electrical values to analogue signals for a PLC or SCADA.

How to select a power meter

Check the system (single or three phase, three or four wire), the voltage and the current transformer secondary (1 A or 5 A). Choose the accuracy class for billing or monitoring, the measured values and harmonics needed, the mounting (panel cut-out such as 96 x 96 mm, or DIN rail) and the communication protocol. For power factor correction, size the controller by the number of capacitor steps and confirm whether harmonic filtering or detuned steps are needed where drives are installed.

Data needed for a quotation

Send the model code, or system voltage, CT ratio, accuracy class, mounting, communication and quantity.