Identification - ABB REG670 Applications Manual

Section 9
Current protection
9.15.1
9.15.2
9.16
9.16.1
9.16.2
400

Identification

Function description
Generator stator overload protection
Application
Overload protection for stator, GSPTTR.
The overload protection GSPTTR 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
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 protects stator windings against
excessive temperature rise as result of overcurrents.
Generator rotor overload protection GRPTTR
Identification
Function description
Generator rotor overload protection
Application
The overload GRPTTR 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
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
IEC 61850 IEC 60617
identification identification
GSPTTR
2
R copper losses. Because
IEC 61850 IEC 60617
identification identification
GRPTTR
1MRK 502 071-UEN -
ANSI/IEEE C37.2
device number
49S
ANSI/IEEE C37.2
device number
49R
Application manual