The 320 to 327 series relays from NewElec are designed with a fixed thermal curve that results in as little as a 200 s trip delay for a sustained overload condition of only 1%. Cyclic overloading conditions are monitored via the built-in thermal memory so that successive cycles of overloading will eventually cause a trip condition. Phase unbalance and phase loss conditions result in a trip delay of 4 s. The relay series caters for prolonged starting times by permitting the user to select a start time period.
The 320–327 series relays provide comprehensive motor protection
Relays in the series are simple to configure, requiring only limited information about the motor for correct protection setup. The information needed comprises:
* Full load rating of the motor.
* Manufacturer's recommended permissible starts per hour.
* Actual time required to accomplish a complete start, as installed.
The standard relay can be chassis or door mounted, requires an auxiliary power supply of 110 or 220 V a.c. and protects against running and start stall conditions. An automatically self-calibrated 4-20 mA output loop is a useful addition when an analogue value of motor load is required for PLC control. Fault finding is simplified through diagnostic LEDs on the relay control panel face.
To further enhance the protection benefits of this product it is possible to add the following features: earth and short circuit protection fault elements; immediate overload warning; and a back-tripping facility into a back-up ACB or OCB by means of a shunt when the circuit is exposed to high energy fault conditions. Accelerated or delayed trip times for high-energy faults and pre-programmed limited start attempts are other options.
Retrofitting for sustainability Schneider Electric South Africa
Electrical Power & Protection
As budgets tighten and sustainability targets increase, retrofit and modernisation strategies are gaining traction across Africa, allowing organisations to upgrade only what limits performance while preserving existing infrastructure and extending asset life.
Read more...USB-Datalogger for voltage 0 to 30 V DC Vepac Electronics
Electrical Power & Protection
The PeakTech 5186 is a data logger for DC voltages from 0 V to 30 V with terminals on the top of the device.
Read more...Pole-top boxes for smarter, more secure electricity networks
Electrical Power & Protection
As South Africa accelerates the rollout of smart prepaid electricity metering, innovative enclosure technology from Power Process Systems is helping utilities improve network security, reduce electricity theft and protect critical electrical infrastructure.
Read more...Simplifying electrical design compliance
Electrical Power & Protection
Referro Systems highlights how Rockwell Automation’s Global SCCR Tool simplifies short-circuit current rating compliance for complex industrial electrical systems.
Read more...Engineering resilience into Africa’s energy future
Electrical Power & Protection
Zutari’s managing director of water explains how Burundi’s landmark Jiji and Mulembwe hydropower projects demonstrate what resilient, climate-adapted infrastructure delivery looks like – and what this means for Africa’s energy future.
Read more...Voltage Tester with LED-Display Vepac Electronics
Electrical Power & Protection
The PeakTech 1094 is a reliable and robust two-pole voltage tester that has been specially developed for the safe and precise measurement of AC and DC voltages in the 12 to 400 V range.
Read more...Schneider Electric launches circuit breaker for cost-effective LV protection Schneider Electric South Africa
Electrical Power & Protection
Schneider Electric has launched its EasyPact CVS C4 moulded case circuit breaker in South Africa, extending the Easy series to 1 600 A and giving consultants, contractors, and end users a cost-effective solution for non-critical low-voltage applications.
Read more...Schneider Electric launches cost-effective, high-performance LV protection Schneider Electric South Africa
Electrical Power & Protection
Schneider Electric has launched its EasyPact NW air circuit breaker in South Africa, extending its Easy series portfolio with a cost-effective solution for non-critical low-voltage applications in commercial, industrial and residential projects.
Read more...SF6-free switchgear brings digital intelligence to mining Schneider Electric South Africa
Electrical Power & Protection
Combining pure-air switchgear with embedded digital intelligence helps mines cut greenhouse gas emissions, improve safety and meet sustainability targets while enabling real-time visibility into critical electrical assets.
Read more...Turning plastic waste into clean hydrogen
Electrical Power & Protection
Researchers have developed a solar-powered process that converts plastic waste into hydrogen and useful industrial chemicals while using spent acid from vehicle batteries. The approach could help create a circular system for dealing with several challenging waste streams at the same time.
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