NewElec's N series motor protection relays provide flexibility to meet most low voltage application requirements from 5 to 550 A. Five models are available with protection features ranging from basic overload protection for both cyclic and sustained conditions, together with single phasing protection, to earth leakage protection with a sensing threshold of 250 mA.
Certain models in the range facilitate the transmission of the motor status and trip conditions to a remote control room, while running stall protection with a 100 ms trip time is featured in the latter models. All other models have locked rotor protection where the trip time will be a function of the remaining motor thermal capacity at the occurrence of the incident. A built-in motor load transducer in the form of a 4 to 20 mA output loop is able to serve as an analog input for a PLC.
All models can be mounted either on a chassis plate or on an MCC cubicle door. The range permits the selection of a NewElec current transformer module block that comprises three current transformers in a neat space-saving enclosure. On models where earth leakage protection is offered, a core balance current transformer is included in the compact CT block design.
All relays in the range permit a cold thermal trip curve selection of between 2,5 to 32,5 seconds at six times motor full load current, while the corresponding hot curve will be restricted to 33% of the cold curve selection. Type 2 co-ordination is maintained throughout the range. This selection of curves renders the relay useful for straightforward DOL starting of small to large motors, as well as star delta or soft starting configurations for the purpose of control and starting of high inertia loads. The relays are configured fail-safe and are equipped with fault retentive LEDs, even in the event of a power failure. An auto/manual overload trip reset selector switch is available together with a testing facility, which can easily be used to test the accuracy of the relay on planned maintenance days.
Africa’s net-zero ambition must become operational Schneider Electric South Africa
Electrical Power & Protection
Schneider Electric’s Rohit Chashta argues that the biggest gap in Africa’s green transition is not ambition but execution, and outlines how advisory services, bankable project roadmaps, digital visibility and SF6-free switchgear can turn sustainability commitments into measurable progress.
Read more...High-efficiency half-brick DC-DC converters Vepac Electronics
Electrical Power & Protection
The Supreme series half-brick DC-DC converters from Vepac Electronics use synchronous rectification for high conversion efficiency, in a six-sided metal case built to withstand harsh industrial and transportation environments.
Read more...Zinc-based batteries power a more sustainable energy future
Electrical Power & Protection
Zinc-based batteries are gaining ground as a safe, recyclable and cost-effective energy storage option, from consumer electronics to grid-scale systems. The International Zinc Association’s Simon Norton explains why zinc is well placed to support the clean energy transition.
Read more...Energas introduces lower-cost German gas genset for South African market
Electrical Power & Protection
Energas Technologies will supply R Schmitt Enertec’s new Energy Line genset to the South African market, offering German-engineered gas-to-power generation of 400 to 500 kW at a lower entry cost through focused standardisation and a simpler standalone architecture.
Read more...ACTOM plays key role in large transmission substation project in Swellendam ACTOM Electrical Machines
Electrical Power & Protection
ACTOM has been appointed to engineer, procure, construct and commission the 1000 MVA main transmission substation for the Overberg Wind Farm in Swellendam, one of the largest substations of its kind in South Africa.
Read more...Reliable power conversion from high-voltage DC buses Conical Technologies
Electrical Power & Protection
The MEAN WELL DDRH-240 from Conical Technologies is a high-reliability DIN-rail DC-DC converter with a wide 250 to 1500 V DC input range, deriving stable low-voltage power directly from high-voltage DC buses in renewable energy, storage, charging, railway and industrial installations.
Read more...AES maintains a strong value and safety stance on boiler retrofits
Electrical Power & Protection
AES Commercial Director Dennis Williams explains when a boiler retrofit makes more sense than replacement, outlines the range of efficiency and emissions upgrades available, and draws the line at safety: a boiler not legally signed off is shut down, no exceptions.
Read more...The grid needs to become more intelligent Schneider Electric South Africa
Electrical Power & Protection
South Africa’s power grid is becoming bidirectional and far more dynamic as distributed energy resources proliferate. Schneider Electric’s Nishandra Bajinath explains why digitalisation, DERMS and aggregation are essential to keep this increasingly complex grid stable and efficient.
Read more...ACTOM’s integrated electrical solutions reduce project risk and accelerate delivery
Electrical Power & Protection
ACTOM has secured multiple orders across four divisions for the Naos-1 hybrid solar and battery project in the Free State, demonstrating its integrated model for supplying the full electrical chain from high-voltage equipment to distribution transformers.
Read more...Smarter energy management starts with intelligent electrification ABB South Africa ABB Electrification Products
Electrical Power & Protection
ABB Electrification specialists Adeline Maleka and Nokulunga Dube explain how the convergence of electrification, digitalisation and automation is helping South African industries gain real-time visibility, reduce energy waste and build operational resilience.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version