1MAC309294-MB F Section 4
Protection functions
RER620 131
Technical Manual
(isolated) or grounded via a resonance coil or through low resistance. It also applies to
solidly grounded networks and ground-fault protection of different equipment connected
to the power systems, such as shunt capacitor bank or shunt reactors and for backup
ground-fault protection of power transformers.
Many applications require several steps using different current pickup levels and time
delays. 51N/50N or 51G/50G consists of three different protection stages:
• Low 51N/G
• High 50N/G-1/2
• Instantaneous 50N/G-3.
51N/G contains several types of time-delay characteristics. 50N/G-1/2 and 50N/G-3 are
used for fast clearance of serious ground faults.
4.1.3.8 Signals
Table 146: 51N/G and 50SEF Input signals
Table 147: 50N/G-1/2 Input signals
Table 148: 50N/G-3 Input signals
Table 149: 51N/G and 50SEF Output signals
Name Type Default Description
IG or IN SIGNAL 0 Ground current
BLOCK BOOLEAN 0=False Block signal for activating the blocking mode
ENA_MULT BOOLEAN 0=False Enable signal for current multiplier
Name Type Default Description
IG or IN SIGNAL 0 Ground current
BLOCK BOOLEAN 0=False Block signal for activating the blocking mode
ENA_MULT BOOLEAN 0=False Enable signal for current multiplier
Name Type Default Description
IG or IN SIGNAL 0 Ground current
BLOCK BOOLEAN 0=False Block signal for activating the blocking mode
ENA_MULT BOOLEAN 0=False Enable signal for current multiplier
Name Type Description
TRIP BOOLEAN Trip
PICKUP BOOLEAN Pickup
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