4–8
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
A2 METERING
CHAPTER 4: ACTUAL VALUES
A2 Metering
The relay measures fundamental frequency phase and ground currents, and all auxiliary
analog inputs. Other values like neutral current, symmetrical components, differential and
restraint currents are derived. All quantities are recalculated every power system cycle and
perform protection and monitoring functions. Displayed metered quantities are updated
approximately three (3) times a second for readability. All phasors and symmetrical
components are referenced to the phase A current phasor.
By scrolling the Up/Down keys the relay shows one-by-one, all metered values as follows:
WINDING 1 CURRENT
W1 PH A CURRENT
0.0 A
0
o
lag
Range: 1 to 6000 A, 0 to 359
o
lag
W1 PH B CURRENT
0.0 A
0
o
lag
Range: 1 to 6000 A, 0 to 359
o
lag
W1 PH C CURRENT
0.0 A
0
o
lag
Range: 1 to 6000 A, 0 to 359
o
lag
W1 NTRL CURRENT
0.0 A
0
o
lag
Range: 1 to 6000 A, 0 to 359
o
lag
W1 GND CURRENT
0.0 A
0
o
lag
Range: 1 to 6000 A, 0 to 359
o
lag
W1 SENS GND CURRENT
0.0 A
0
o
lag
Range: 1 to 600 A, 0 to 359
o
lag
W1 NEG SEQ CURRENT
0.0 A
0
o
lag
Range: 1 to 6000 A, 0 to 359
o
lag
W1 GND DIFF CURRENT
0.00 x CT 0
o
lag
