ABB Relion 670 Series Applications Manual page 484

Section 17
Monitoring
Winding 1 : Only winding 1 CT is available. This option can be selected when two winding
•
transformer is considered.
Winding 2 : Only winding 2 CT is available. This option can be selected when two winding
•
transformer is considered.
Winding 1&2 : Only winding 1 and winding 2 CTs are available. This option can be selected when
•
three winding transformer is considered.
Winding 1&3 : Only winding 1 and winding 3 CTs are available. This option can be selected when
•
three winding transformer is considered.
Winding 2&3 : Only winding 2 and winding 3 CTs are available. This option can be selected
•
when three winding transformer is considered.
All windings : All windings CTs are available. This option can be selected for both two and three
•
winding transformer.
RatedVoltW1 : This setting is used to set the rated voltage of winding 1 in kV.
RatedVoltW2 : This setting is used to set the rated voltage of winding 2 in kV.
RatedVoltW3 : This setting is used to set the rated voltage of winding 3 in kV.
UPerTap : This setting is used to set the voltage increment/decrement between two successive
tap positions (ΔV) in kV.
Time required for the top oil temperature in relation to ambient temperature to reach its ultimate
value is a function of the thermal oil time constant. The function has the following settings related
to oil time constant.
OilTmConstMode : This setting is used to select the oil time constant mode of input to the
function. It has three options:
Standard : Oil time constant is taken from the IEEE or IEC standard as selected for the
•
temperature calculations.
User defined : Oil time constant is provided by the user through setting. The value may be
•
given by the transformer manufacturer.
Calculated : Oil time constant is calculated by the function based on the transformer
•
parameters given by the user.
OilTimeConst : This setting is used to get the oil time constant from the user and this will be used
OilTmConstMode setting is selected as User defined . Likely it is between 1 and 3 hours.
when
AvgOilTmpRise : The top oil temperature is based on the average temperature rise of the lumped
mass. In the case of transformer, this would be the average oil temperature. This setting is used to
set the average oil temperature rise above ambient temperature in K (Kelvin). This value should be
obtained from the manufacturer based on certified heat run test reports conducted at maximum
rating given in the name plate.
CoilCoreMass : This setting is used to set the transformer coil and core assembly mass. This mass
consists of all winding mass, core mass and paper mass of the transformer.
OilMass : This setting is used to set the transformer oil mass. This mass consists of free oil mass
and oil insulation mass of the transformer.
TankMass : This setting is used to set the transformer tank mass. This mass is only the tank and
fittings that are in contact with heated oil.
LoadLoss : This setting is used to set the transformer load loss at rated condition.
478
© Copyright 2017 ABB. All rights reserved
1MRK 511 401-UUS F
GUID-2D78A349-4A55-441A-BEC6-A590A1742AE2 v1
Bay control REC670
Application manual