ABB Relion 670 Series Applications Manual page 511

1MRK 511 401-UEN Rev. K
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 when
hours.
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.
TTLoadLoss : This setting is used to set the transformer load loss arrived from type test.
NoloadLoss : This setting is used to set the transformer no-load loss.
TTNoloadLoss : This setting is used to set the transformer no-load loss arrived from type test.
Winding time constant is the time for winding temperature to rise over the oil temperature to
reach 63.2% of the difference between the final rise and initial rise during a load change. The
winding time constant may be estimated from the resistance cooling curve during thermal
tests or calculated by the manufacturer using mass of the conductor material. The function
has the following settings related to winding time constant.
Bay control REC670
Application manual
OilTmConstMode setting is selected as User defined . Likely it is between 1 and 3
© Copyright 2017 Hitachi Power Grids. All rights reserved
Section 18
Monitoring
GUID-2D78A349-4A55-441A-BEC6-A590A1742AE2 v1
GUID-BDD32D22-D1C2-47C2-9B4C-A055C847CCA2 v1
505