4.1.12 Generator shaft current leakage protection GSLPTOC
( ANSI 38,51)
4.1.12.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Generator shaft current leakage
protection
GSLPTOC I>,GS 38, 51
4.1.12.2 Function block
Figure 248: Function block
4.1.12.3 Functionality
Generator shaft current leakage protection function GSLPTOC protects the
generator rotor bearings from damage caused by the shaft leakage current.
The function compares measured shaft current to the set alarm and operate levels.
Operate time characteristics are according to definite time (DT).
4.1.12.4 Analog channel configuration
GSLPTOC has one analog input which must be properly configured.
Table 495: Analog inputs
Input Description
ISHFT Measured shaft current
4.1.12.5 Operation principle
The
Operation
setting is used to enable or disable the function. When selected "On"
the function is enabled and respectively "Off" means function is disabled.
The operation of
Generator shaft current leakage protection
can be described by
using a module diagram (see figure below). All the modules in the diagram are
explained in the next sections.
1MRS759142 F
Protection functions
REX640
Technical Manual
435
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