9.16.1
Identification
GUID-2FB631FB-E6F7-4FAC-A350-BEB2867C7E9E v2
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Generator rotor overload protection
GRPTTR
<
SYMBOL-MM V1 EN-US
49R
9.16.2
Application
GUID-ED0BC8FC-8679-4C6F-B4C4-5904F7951F03 v3
The overload GRPTTR (49R) protection 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. Rotor
components such as bars and end rings are vulnerable to this damage. Temperature rise
within 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 rotor overload function GRPTTR (49R) protects rotor windings against
excessive temperature rise as result of overcurrents.
9.16.3
Setting guideline
GUID-C302261D-BCD8-4BDF-8FC7-DE48615B9B0A v1
GUID-62053F97-68F6-4847-98D4-4664C0CC6A0E v4
Two setting examples will be given for two applications as shown in Figure
1MRK 502 071-UUS A
Section 9
Current protection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
433
Application manual
Summary of Contents for RELION 670 SERIES REG670
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