NewElec’s NewFeed Microgrid Feeder Protection Relay is designed to provide motor and feeder protection in low voltage (LV) and medium voltage (MV) environments with multiple curve selections as well as positive, negative and zero sequence voltage and current.
Phase angles are measured and integrated into most relevant ANSI protection features, which can be set for disabled, warning or trip protection mode. A variety of MV and LV current transformer module blocks (CTMBs) cater for different current ranges with easy interfacing to higher current and system voltages us current transformers and voltage transformers, the ratios of which are selectable on the configuration software. This enables full isolation as well as flexible range settings. An external core balance current transformer caters for sensitive earth leakage detection.
The relay is an ISO 9001:2015 compliant IED (intelligent electronic device). It is a microcontroller-based precision instrument with ANSI protection elements, advanced control features and switchgear controller logic. Integrating motor and feeder control functions with prestart, close command execution time and continuous breaker state monitoring with load current feedback, it detects unauthorised operation or starting as well as breaker failure.
The NewFeed relay is fully configurable with the aid of front-end configuration software. Event records can be downloaded onto a memory stick for further analysis. The relay has an on-board database where time- and date-stamped fault records (36 last faults) and event records (940 events) are kept. The relay also has a data recorder and spectrum analyser, which can be used to analyse motor performance and supplied power quality respectively. The spectrum analyser can detect harmonics up to the 9th on any of the three phase currents.
For more information visit: www.newelec.co.za
