8.17.1 Identification
GUID-5D79DC7D-D4DA-47F1-B1FA-5200D8FF08D5 v1
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Generator stator overload
protection
GSPTTR 49S
8.17.2 Functionality
GUID-A416C856-E438-4ED4-A43D-D05F718D6A41 v5
The generator overload function, GSPTTR (49S) is used to protect the stator winding against
excessive temperature as a result of overcurrents. The functions operating characteristic is
designed in accordance with the American standard IEEE-C50.13.
If internal generator components exceed its design temperature limit, damage can be the result.
Damage to generator insulation can range from minor loss of life to complete failure, depending
on the severity and duration of the temperature excursion. Excess temperature can also cause
mechanical damage due to thermal expansion. Since temperature increases with current, it is
logical to apply overcurrent elements with inverse time characteristics.
For its operation the function either measures the true RMS current of the stator winding or
waited sum of the positive and negative sequence components in the stator winding.
The function is designed to work on 50/60 Hz systems.
8.17.3 Function block
GUID-4E840FB7-3B63-4860-A583-84FCD5FDDBDD v1
ANSI12000027-3-en.vsd
GSPTTR (49S)
I3P*
BL OC K
SETLKOUT
RSTLKOUT
TRIP
PICKUP
LOCKOUT
79M BLOCK
ANSI12000027 V3 EN-US
Figure 309: GSPTTR (49S) function block
8.17.4 Signals
PID-3719-INPUTSIGNALS v5
Table 318: GSPTTR (49S) Input signals
Name Type Default Description
I3P GROUP
SIGNAL
- Current Group Connection
BLOCK BOOLEAN 0 Block of function
SETLKOUT BOOLEAN 0 Input for forcing the output LOCKOUT
RSTLKOUT BOOLEAN 0 Reset of the output LOCKOUT and theta to 0%
Section 8 1MRK 502 066-UUS B
Current protection
578
Technical manual
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