Voltage and Frequency Relay with integrated vector shift relay grid and plant protection.
The SPI1021 monitors voltage and frequency in plants for own generation of electricity. It fulfills the requirements of CEI 0-21. 3 selectable programs allow measuring 3 phases to neutral (4-wire mode), 3 phases phasephase (3-wire mode) and single phase to neutral (2-wire). The SPI1021 can monitor all decentralized power, photovoltaic, wind or thermal plants, that feed in the low voltage and medium voltage grid. In applications with possible asymmetry >6 kVA, power balance has to be monitored extra.