NewElec’s NewCode KE range measures voltage to ensure comprehensive motor protection. Unbalanced motor voltages may cause a current inbalance that increases the operating temperature and energy losses of a motor. These voltages can magnify the current inbalance in the stator windings of a motor as much as 20 times. When the voltage unbalance is more than 1%, de-rating the motor will help lessen the effects. If the unbalance exceeds 5%, it is not advisable to operate the motor at all, even if it has been de-rated. When a voltage unbalance exceeds 3%, the root cause should be identified and corrected.
For general motor protection, it is always assumed that the system voltage is stable. This is due to legislation such as NRS 048. This is divided into several parts, mainly guiding the quality of the power supply (QOS) and focusing on voltage parameters such as magnitude and dip time. However, during fault conditions the system is unstable and it is essential to know the voltage variation to protect the motor comprehensively. It is generally known that in a fixed power system there is a 1% increase in current measurement, therefore a 2% increase in voltage. Suddenly fluctuating voltages also contribute to deteriorating winding insulation in a motor, thus reducing the motor life.
Setting new standards in dry-type transformer technology
Electrical Power & Protection
Dry-type transformer technology is gaining ground globally, and leading the charge in Africa is Trafo Power Solutions, in partnership with Italian manufacturer, TMC Transformers.
Read more...Advanced process control for the IRP Schneider Electric South Africa
Electrical Power & Protection
One of the main challenges in implementing South Africa’s Integrated Resource Plan is ensuring grid stability while integrating renewable energy sources and balancing fluctuating energy demands. Advanced process control can play an important role.
Read more...Revolutionising fault location and maximising solar production Comtest
Electrical Power & Protection
Comtest has on offer the Fluke GFL-1500 solar ground fault locator, a frontline troubleshooting tool that helps technicians pinpoint active ground faults in solar photovoltaic systems.
Read more...Supporting the AI boom with power architecture
Electrical Power & Protection
Hitachi Energy is supporting the 800 VDC power architecture announced by Nvidia, by developing a cleaner, more efficient way to power the next generation of AI infrastructure.
Read more...Kyocera releases new stacked capacitors
Electrical Power & Protection
Kyocera AVX has released the new KGP Series commercial-grade stacked capacitors for high-frequency applications in the industrial and downhole oil and gas industries.
Read more...More sustainable tyres
Electrical Power & Protection
Continental is prioritising the use of renewable and recycled materials in its tyre production
Read more...ABB drives rail modernisation and EV growth in South Africa
Electrical Power & Protection
ABB’s work in Africa in low- and medium-voltage infrastructure, safety-critical components and electrification puts it at the heart of accomplishing the Southern African Railways Association’s strategy.
Read more...Hitachi Energy’s power quality solution
Electrical Power & Protection
Hitachi Energy has announced the deployment of its power quality solution to connect Tanzania’s leading gold producer, Geita Gold Mine (GGML) securely to the national grid.
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