9.15 Generator stator overload protection GSPTTR (49S)
GUID-4E9923FE-AA5F-4D03-9F49-D30F16879A5A v2
9.15.1 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
9.15.2 Application
GUID-2046CD9A-EF43-4AF9-8BD5-581D9E453587 v2
Overload protection for stator, GSPTTR(49S).
The overload protection GSPTTR(49S) is intended to prevent thermal damage. A
generator may suffer thermal damage as a result of overloads. Damage is the result
when one or more internal generator components exceeds its design temperature limit.
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. Temperature
rise with in a generator for these conditions is primarily a function of I
2
R copper
losses. Because temperature increases with current, it is logical to apply overcurrent
elements with inverse time-current characteristics. The generator overcurrent
applications are complicated by the complexity of generator thermal characteristics and
the time-varying nature of current experienced during starting and when the generator
drives a time-varying load.
The generator stator overload function GSPTTR(49S) protects stator windings against
excessive temperature rise as result of overcurrents.
9.16 Generator rotor overload protection GRPTTR (49R)
GUID-2EF7010A-F585-4C53-879F-F7908CF58DE9 v2
Section 9 1MRK 502 071-UUS A
Current protection
432 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
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