ABB Relion 670 Series RES670, Technical Manual

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13.2.6 Monitored data
Table 211: FUFSPVC Monitored data
Name Type Values (Range) Unit Description
3I0 REAL - A Magnitude of zero sequence
current
3I2 REAL - A Magnitude of negative
sequence current
3V0 REAL - kV Magnitude of zero sequence
voltage
3V2 REAL - kV Magnitude of negative
sequence voltage
13.2.7 Operation principle
13.2.7.1 Zero and negative sequence detection
The zero and negative sequence function continuously measures the currents and voltages
in all three phases and calculates, see figure
127 :
• the zero-sequence voltage 3V0
• the zero-sequence current 3I0
• the negative sequence current 3I2
• the negative sequence voltage 3V2
The measured signals are compared with their respective set values 3V0PU and 3I0PU ,
3V2PU and 3I2PU .
The function enable the internal signal FuseFailDetZeroSeq if the measured zero-
sequence voltage is higher than the set value
3V0PU and the measured zero-sequence
current is below the set value 3I0PU .
The function enable the internal signal FuseFailDetNegSeq if the measured negative
sequence voltage is higher than the set value
3V2PU and the measured negative sequence
current is below the set value 3I2PU .
A drop out delay of 100 ms for the measured zero-sequence and negative sequence current
will prevent a false fuse failure detection at un-equal breaker opening at the two line ends.
Section 13
1MRK 511 365-UUS A
Secondary system supervision
366 Phasor measurement unit RES670 2.1 ANSI
Technical manual