ABR – Automatic Backfeed Restoration

This function generates an automatic close of the recloser if supply is applied to one side of normally open recloser and another side of recloser has no voltage.

ACR - Automatic Circuit Recloser

An Automatic Circuit Recloser is a circuit breaker incorporating a multishot, autoclosing relay, installed on a medium voltage feeder. They are designed to trip when a fault is detected, then automatically reclose after a set amount of time in an attempt to clear transient faults on the feeder. They can save considerable time when restoring power.

Bus bar (busbar)

An electrically conductive bar connecting two or more electrical circuits.

CT - Current Transformer

Current Transformers are used to measure current for protection and measurement in switchgear applications.

DCE

Data Communication Equipment.

Dielectric

An insulating medium between conductors.

DNP3 - Distributed Network Protocol 3

DNP3 is a communications protocol used for SCADA communications.NOJA Power's range of OSM reclosers are supplied with the DNP3 protocol as standard.

DSA

Distribution System Automation.

ITS - Interface Test Set

The Interface Test Set simulates the current and voltage signals generated by sensors inside the OSM recloser bushings for system testing purposes. It is used to perform tests such as three phase short circuit, phase to phase short circuit, earth fault, upstream broken wire, low source voltage and loss of supply.

MCC - Motor Control Centre

A modular cabinet system for powering and controlling motors in a mine or factory.

MPM - Main Processing Module

OSM - Outdoor Switch Module

The Outdoor Switch Module is an outdoor, pole-mounted, medium voltage recloser. It features full-directional protection, current and voltage measurement on all six bushings, no SF6 or oil insulants and is light weight. Full SCADA and communications features are standard along with programmable digital I/O.

Recloser

A recloser is a circuit breaker incorporating a multishot, autoclosing relay, installed on a medium voltage feeder. They are designed to trip when a fault is detected, then automatically reclose after a set amount of time in an attempt to clear transient faults on the feeder. They can save considerable time when restoring power.

Rogowski Sensor

A Rogowski sensor is an air-cored CT design made out of a helix coil. They are immune to core saturation at high fault currents, produce safe voltages (millivolts) have an increased accuracy over a wider range and are very lightweight.

RTU - Remote Terminal Unit

Remote control and monitoring unit used in SCADA systems.

SCADA - Supervisory Control And Data Acquisition

SCADA systems are used to monitor and control a population of remote devices from a central control room. A communications protocol is required to receive and transmit alarms and other data. NOJA Power reclosers are SCADA ready with RS232, USB, Ethernet, Wi-Fi and 4G connectivity and a number of protocols including DNP3, 2179, IEC 60870-5-101 and 104 and IEC 61850.

SEF - Sensitive Earth Fault

Sensitive Earth Fault is a form of Earth Fault protection capable of detecting low fault currents. The OSM recloser can detect SEF from 1 - 80A.

SF6 - Sulfur hexafluoride

Colourless, odourless gas used to insulate electrical switchgear. Identified by the KYOTO protocol as one of the 6 greenhouse gasses. SF6 gas has a an environmental impact 24000 times CO2 (Carbon Dioxide) and has an atmospheric lifetime of up to 3200 years.