Setting Guideline - ABB RER670 Applications Manual

Section 8
Current protection
8.6.3
186
temperature in degrees Celsius) and associated comparator (i.e. REALCOMP)
and timer (i.e. TIMERSET) function blocks. By using such additional logic,
for example, an automatic control of power transformer cooling fans can be
engineered within the IED.

Setting guideline

The parameters for the Thermal overload protection, one time constant, Celsius
LPTTR are set via the local HMI or PCM600.
tPulse: Trip signal pulse length.
SensAvailable: Indication for external temperature sensor availability.
DefaultAmbTemp: Default ambient temperature used when external ambient
temperature sensor is set to off or invalid.
DefaultTemp: Initial temperature raise above ambient temperature during startup.
SensMinTemp: Minimum ambient temperature used for limit check.
SensMaxTemp: Maximum ambient temperature used for limit check.
SenInvRstTim: Sensor invalid signal reset time delay.
TmpAmbMin: Ambient temperature minimum value considered for calculation.
The following settings can be done for the thermal overload protection.
Operation: Off/On
GlobalBaseSel is used to select a GBASVAL function for reference of base values,
primary current (IBase), primary voltage (UBase) and primary power (SBase).
Imult: Enter the number of lines in case the protection function is applied on
multiple parallel lines sharing one CT.
IRef: Reference, steady state current, given in % of IBase that will give a steady
state (end) temperature rise TRef. It is suggested to set this current to the maximum
steady state current allowed for the line/cable under emergency operation (a few
hours per year). For power transformer application, the IRef parameter is typically
set to 100% (e.g. equal to the rated current) because the heat run tests are typically
conducted in such way.
TRef: Reference temperature rise (end temperature) corresponding to the steady
state current IRef. From cable manuals current values with corresponding
conductor temperature are often given. These values are given for conditions such
as earth temperature, ambient air temperature, way of laying of cable and earth
thermal resistivity. From manuals for overhead conductor temperatures and
corresponding current is given. For power transformers, this value is typically
available from the power transformer manual or from the heat run test report.
1MRK 506 375-UEN A
Railway application RER670 2.2 IEC
Application manual
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