Electrical Power & Protection

Pump motor protection

October 2015 Electrical Power & Protection

A range of electronic motor protection and control relays designed to protect pumps and motors from a variety of faults is available from NewElec. The K series is aimed at pump users and consultants who specify protection requirements for pumps.

They incorporate features such as dry-run protection and phase reversal protection, which are basic requirements for the protection of pumps. A model exists for every budget. The more upmarket models include built-in features that allow for a user-selected pump priming time, as well as a user-selectable pump operating time slot. Automated re-start times for dry-run trips are available, together with selectable automatic overload trip resets. A useful feature on some models permits the user to measure dry-running condit-ions by means of power factor measurements instead of conventional current measurement so that greater accuracy can be achieved.

The range includes relays with the most basic features that need manual adjustment directly by the user, through to the more sophisticated that can only be programmed by the supporting software, thereby avoiding possible setting interference by users. This includes the monitoring of statistical information such as the number of starts, trip faults and pump efficiency. Motor protection is achieved by the usual current measurement methods and user-selectable phase voltage measurements. Some of the relays in the range also include earth leakage protection, as well as earth insulation lock-out protection. The range is very user-friendly and has no limits on current range. In order of sophistication, the relays are called KB, KA, KC, KD and KE.

For more information contact NewElec, 086 010 3041, sales@newelec.co.za, www.newelec.co.za


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