STANDARDS : Conforms to IS 13010, IEC 521 & CBIP Report No.88
ACCURACY : Class 2.0 for Whole Current Meters & Class 1.0 & 2.0 for CT Operated Meters
NOMINAL VOLTAGE : 3 x 240 Volts, Variation + 20% to - 40%
MAXIMUM CURRENT : 5A, 10A, 20A, 30A & 40A for Whole Current Meters & 120% of Ib for CT Operated Meters
NOMINAL FREQUENCY : 50 Hz +/- 5%
REGISTERING MECHANISM : Cyclometer type with 5/6 drums. The unidirectional counters are also available
BRAKE MAGNET : Four pole magnet of ALNICO Grade V or VI. The magnets are aged against time, temp. & external magnetic effects before assembly
LOWER BEARING : Magnetic suspension type with two homo polar annular magnets with a guide & bearing bush.
STARTING CURRENT : 0.5% of Ib at rated voltage & unity power factor
TORQUE : More than 8.0 gm-cm at Ib
VOLTAGE CIRCUIT POWER LOSS : As per IS : 13010-2002
AC VOLTAGE TEST : 4 KV for 1 minute
ADJUSTMENTS :
o Full load adjustment
o Low load adjustment
o Inductive load adjustment
o Creep adjustment
o Torque adjustment
EFFICIENCY FACTOR : 1.2 minimum