ABB RET670 - Measurements CVMMXN; Phase Current Measurement CMMXU; Phase-Phase Voltage Measurement VMMXU; Phase-Neutral Voltage Measurement VNMMXU

Monitoring
Table 80. Measurements CVMMXN
Function Range or value Accuracy
Frequency (0.95-1.05) × f
r
± 2.0 mHz
Voltage (0.1-1.5) ×U
r
± 0.5% of U
r
at U£U
r
± 0.5% of U at U > U
r
Connected current (0.2-4.0) × I
r
± 0.5% of I
r
at I £ I
r
± 0.5% of I at I > I
r
Active power, P 0.1 x U
r
< U < 1.5 x U
r
0.2 x I
r
< I < 4.0 x I
r
± 1.0% of S
r
at S ≤ S
r
± 1.0% of S at S > S
r
Conditions:
0.8 x U
r
< U < 1.2 U
r
0.2 x I
r
< I < 1.2 I
r
Reactive power, Q 0.1 x U
r
< U < 1.5 x U
r
0.2 x I
r
< I < 4.0 x I
r
Apparent power, S 0.1 x U
r
< U < 1.5 x U
r
0.2 x I
r
< I < 4.0 x I
r
Power factor, cos (φ) 0.1 x U
r
< U < 1.5 x U
r
0.2 x I
r
< I < 4.0 x I
r
± 0.02
Table 81. Phase 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° at 0.1 × I
r
< I ≤ 0.5 × I
r
± 0.5° at 0.5 × I
r
< I ≤ 4.0 × I
r
Table 82. Phase-phase voltage measurement 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° at U ≤ 50 V
± 0.2° at U > 50 V
Table 83. Phase-neutral voltage measurement VNMMXU
Function
Range or value Accuracy
Voltage (5 to 175) V ± 0.5% of U at U ≤ 50 V
± 0.2% of U at U > 50 V
Phase angle (5 to 175) V ± 0.5° at U ≤ 50 V
± 0.2° at U > 50 V
Transformer protection RET670 2.0
1MRK 504 141-BEN C
Product version: 2.0
88 ABB