Section 4
1MAC050144-MB C
Protection functions
158
615 series ANSI
Technical Manual
4.1.4.7
Application
51N/50N or 51G/50G is designed for protection and clearance of ground faults in
distribution and sub-transmission networks where the neutral point is 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.
4.1.4.8
Signals
Table 138: 51N/G and 50SEF Input signals
Table 139: 50N/G-1/2 Input signals
Table 140: 50N/G-3 Input signals
Table 141: 51N/G and 50SEF Output signals
Name
Type
Default
Description
I_G or I_N
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
I_G or I_N
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
I_G or I_N
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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