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Lodestar FM PR-35

Technical specifications

PARAMETER	VALUE
Types of registered faults
Fault recording upon line energization	+
General description of devices
Voltage class for overhead and cable lines of distribution networks, kV	6-36
Visual fault indication	LCD display LED indicators
Power supply used in the device	current transformers (supplied with the device) auxiliary source, 220 V AC/DC
Mean Time Between Failures (MTBF)	not less than 130 000 hours
Additional features	setting adjustment via client software firmware updates recorded events log
Records	current
Parameters
Оperating range for protection functions (IOC/TOC), A	1÷400
Protection types	ANSI 50/51 time overcurrent protection (TOC) ANSI 50N/51N ground fault time overcurrent protection (by Ie current), also instantaneous overcurrent (IOC)
Design / Construction
Installation location	inside switchgear (SWG) cubicles on control panel boards
Connection	current sensors based on current transformers (CTs)
Operating temperature range, °C	standard, from –40 to +50
Front panel protection degree	IP20 according to IEC 60529, excluding external connection terminals

TRANSFORMER PROTECTION DEVICE

The Lodestar FM‑PR‑35 device is designed for substations, including those not equipped with auxiliary power sources. It performs relay protection, automation, control, and signaling functions for step‑down transformers, as well as incoming and outgoing power line feeders.

The device generates control actions for secondary circuits based on real‑time primary parameters of the monitored object, implementing protection, control, and automation functions.

The device is suitable for the following applications:

protection of supply line inputs and outgoing lines;
protection of step‑down transformers;
protection of busbar sections.

Benefits:

Alarm and short‑circuit indicator – acts as an alarm and short‑circuit indicator during faults.
Long‑life built‑in battery – integrated battery with up to 30 years of service life.
Self‑powered operation – powered directly from the included current transformers; no external power needed.