Electricity + Control April 2015

ELECTRICAL PROTECTION + SAFETY

Increase your energy efficiency The first rolling blackouts (commonly called load shedding) of 2007/8 shook the country and started discussions around en- ergy efficiency. It appears 2015 is going to be worse. Since the beginning of 2015 there have been constant power disruptions throughout the country. Everyone has been asked to conserve electricity and save up to 15 %. However, one cannot control what is not measured.This is where NewElec ’s range of electronic motor protection relays comes in (such as the NewCode motor protection and control relay), as it has the ability to measure electrical energy con-

sumption. This totalised energy consumption (real watt-hours and var-hours) information can now be downloaded into process databases for further analysis. In ad-

dition to comprehensive consump- tion knowledge, wheremotors are found to be overrated, they can be replaced with smaller more efficient motors, reducing opera- tional costs. Enquiries:Tel. 012 327 1729 or email sales@newelec.co.za

Three phase general motor and pump protection NewElec designs, manufactures and markets three-phase mo- tor protection relays. However, some of its relays are geared towards specific applications, such as pump protection. The NewElec development team has worked with experts in the pumping industry to develop relays much more suited to the application. As an example, the dry run protection (or minimum load or load loss) helps to trip the pump when there is no more media to pump.This is important to safeguard the pump from cavitation thus damaging the pump’s impeller.The settings for

dry run are percent- age load level where the pump is known to be running dry and associated time re- quired to confirm the condition. This per- centage load level is obtained by testing and using empirical data for the specific pump, whereas time

delay is typically set to 10 s or operating specification. Ad- ditionally, one needs to determine when the pump can restart and continue to pump.This can either be calculated based on the pumping infrastructure, for instance dam or sump level, or trial and error. All these parameters can be easily set on NewElec’s KD/KE or NewCode relays, which are geared for pumping environments amongst other applications. Enquiries:Tel. 012 327 1729 or email sales@newelec.co.za