Contact Details:
NewElec (Pty) Ltd
298 Soutter Street cnr Maltzan Street
Pretoria West
Pretoria
0058
South Africa
Tel: +27 (0)12 327 1729
Alt. Tel: 0860 103 041
Fax: +27 (0)12 327 1733
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IMPORTANCE OF VOLTAGE MEASUREMENTS IN MOTOR PROTECTION
Product News Thursday, November 29, 2012: NewElec (Pty) Ltd
For general motor protection, it is always assumed that the system voltage is stable. This is due to legislations such as NRS 048. This legislation is divided into several parts, mainly guiding the quality of the power supply (QOS), focusing on the 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 comprehensively protect the motor. It is generally known that in a fixed power system, there is a 1% increase in current measurement, therefore a 2% increase in voltage. The suddenly fluctuating voltage also contributes to deteriorating winding insulation in a motor, thus reducing the motor life.
NewElec has relays such as its NewCode, KE range and others, that measure voltage to ensure comprehensive motor protection.
