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.

ABR, Automatic Backfeed Restoration

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.

ACR, Automatic Circuit Recloser

Bus bar (busbar)

An electrically conductive bar connecting two or more electrical circuits.

Bus bar, busbar

CT - Current Transformer

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

CT, Current Transformer

DCE

Data Communication Equipment.

DCE, Data Communication Equipment

Dielectric

An insulating medium between conductors.

Dielectric, 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.

DNP3, Distributed Network Protocol 3, SCADA

DSA

Distribution System Automation.

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.

ITS, Interface Test Set

MCC - Motor Control Centre

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

MCC, Motor Control Centre

MPM - Main Processing Module

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.

OSM, Outdoor Switch Module, SF6, SCADA

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.

Recloser, circuit breaker

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.

Rogowski Sensor

RTU - Remote Terminal Unit

Remote control and monitoring unit used in SCADA systems.

RTU, Remote Terminal Unit, SCADA

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 RS485, RS232 ports and protocols such as DNP3 and Modbus.

SCADA, RS232, DNP3, Modbus

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 4 - 80A.

SEF, Sensitive Earth Fault

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.

SF6, gas, environment, KYOTO