FANOX SIL B, User Manual, Page: 80 / 311

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5.
MONITORING AND CONTROL
5.1. Measurements
The measurement precision is ±2% precision in a band covering ±20% of Rated Current and ±4%
in the rest of the range of measurements. 16 samples/cycle are taken.
Frequency measurement is obtained by using the passing through zero of the voltage algorithm.
To obtain line frequency and busbar voltage to get busbar frequency it is specifically used phase
B voltage. The minimum value of this voltage to get frequency measurement are 30 volts. If the
voltage of phase B is lower than 30 volts frequency mesuremint will be 0.00 Hz. The frequency
measurement accuracy is ±0.01 Hz.
The following measurements are provided:
•
Phase r.m.s. currents (IA, IB, IC)
•
Neutral r.m.s. current (IN)
•
Positive sequence current (I1)
•
Negative sequence current (I2)
•
Phase r.m.s. voltages (VA, VB, VC)
•
Residual neutral voltage (VN), calculated internally from the sum of the phase
voltages.
•
Busbar phase B r.m.s. voltage (VBBus)
•
Voltage between phases (U12, U23, U31)
•
Angle current phase L1 respect to VL1(ang-IA)
•
Angle current phase L2 respect to VL1(ang-IB)
•
Angle current phase L3 respect to VL1(ang-IC)
•
Total Active Power (P)
•
Phase Active power (P-A, P-B, P-C)
•
Total Reactive Power (Q)
•
Phase Reactive power (Q-A, Q-B, Q-C)
•
Total apparent power (S)
•
Phase Apparent power (S-A, S-B, S-C)
•
Power factor (cos Phi)
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Each phase Power factor (cos Phi-A, cos Phi-B, cos Phi-C)
•
Thermal image
•
Line frequency and Busbar frequency
•
Phase difference between phase B line voltage and busbar voltage