Monitoring
M12386-1 v16
Table 144. Power system measurement CVMMXN
Function Range or value Accuracy
Frequency (0.95-1.05) x f
r
±2.0 mHz
Voltage (10 to 300) V
±0.3% of U at U ≤ 50 V
±0.2% of U at U > 50 V
Current (0.1-4.0) x I
r
±0.8% of I at 0.1 x I
r
< I < 0.2 x I
r
± 0.5% of I at 0.2 x I
r
< I < 0.5 x I
r
±0.2% of I at 0.5 x I
r
< I < 4.0 x I
r
Active power, P (10 to 300) V
(0.1-4.0) x I
r
±0.5% of S
r
at S ≤0.5 x S
r
±0.5% of S at S > 0.5 x S
r
(100 to 220) V
(0.5-2.0) x I
r
cos φ > 0.7
±0.2% of P
Reactive power, Q (10 to 300) V
(0.1-4.0) x I
r
±0.5% of S
r
at S ≤0.5 x S
r
±0.5% of S at S > 0.5 x S
r
(100 to 220) V
(0.5-2.0) x I
r
cos φ < 0.7
±0.2% of Q
Apparent power, S (10 to 300) V
(0.1-4.0) x I
r
±0.5% of S
r
at S ≤0.5 x S
r
±0.5% of S at S >0.5 x S
r
(100 to 220) V
(0.5-2.0) x I
r
±0.2% of S
Power factor, cos (φ)
(10 to 300) V
(0.1-4.0) x I
r
<0.02
(100 to 220) V
(0.5-2.0) x I
r
<0.01
GUID-5E04B3F9-E1B7-4974-9C0B-DE9CD4A2408F v6
Table 145. Current measurement CMMXU
Function Range or value Accuracy
Current at symmetrical load (0.1-4.0) × I
r
±0.3% of I
r
at I ≤ 0.5 × I
r
±0.3% of I at I > 0.5 × I
r
Phase angle at symmetrical
load
(0.1-4.0) × I
r
±1.0 degrees at 0.1 × I
r
< I ≤ 0.5 × I
r
±0.5 degrees at 0.5 × I
r
< I ≤ 4.0 × I
r
GUID-374C2AF0-D647-4159-8D3A-71190FE3CFE0 v5
Table 146. Voltage measurement phase-phase VMMXU
Function Range or value Accuracy
Voltage (10 to 300) V ±0.5% of U at U ≤ 50 V
±0.2% of U at U > 50 V
Phase angle (10 to 300) V ±0.5 degrees at U ≤ 50 V
±0.2 degrees at U > 50 V
Line differential protection RED670
1MRK 505 379-BEN N
Hitachi Power Grids 131
© Copyright 2017 Hitachi Power Grids. All rights reserved
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