ABB Relion 670 Series Applications Manual page 486

Section 17
Monitoring
CuLossW3 : This setting is used to set the winding loss at rated load for the winding 3.
MassW1 : This setting is used to set the mass of the winding 1.
MassW2 : This setting is used to set the mass of the winding 2.
MassW3 : This setting is used to set the mass of the winding 3.
Loss ratios at different tap positions are required for the calculation of top oil temperature,
especially when the transformer is using online tap changer. This loss ratio is the ratio between
load losses to no-load loss. It may vary from 6 -7 for distribution transformer and 4-8 for power
transformer. Normally it varies from 3 to 11. The function has the following settings related to loss
ratio calculation.
RLRated : This setting is used to set the ratio of load losses to no-load loss at principal tapping
position.
RLHighRated : This setting is used to set the ratio of load losses to no-load loss at principal
tapping +1 position.
RLMaxTap : This setting is used to set the ratio of load losses to no-load loss at maximum tap
position where maximum voltage is possible.
RLMinTap : This setting is used to set the ratio of load losses to no-load loss at minimum tap
position where minimum voltage is possible.
RatedVoltTap : This setting is used to set the position number of tap changer at rated voltage.
HighVoltTap : This setting is used to set the position number of tap changer at possible maximum
voltage.
LowVoltTap : This setting is used to set the position number of tap changer at possible minimum
voltage.
The following settings are required to perform the calculation of top oil temperature using
monthly model of ambient temperature when AMBVALID is low:
JanAmbTmp : This setting is used to set the January month average ambient temperature.
FebAmbTmp : This setting is used to set the February month average ambient temperature.
MarchAmbTmp : This setting is used to set the March month average ambient temperature.
AprilAmbTmp : This setting is used to set the April month average ambient temperature.
MayAmbTmp : This setting is used to set the May month average ambient temperature.
JuneAmbTmp : This setting is used to set the June month average ambient temperature.
JulyAmbTmp : This setting is used to set the July month average ambient temperature.
AugAmbTmp : This setting is used to set the August month average ambient temperature.
SepAmbTmp : This setting is used to set the September month average ambient temperature.
OctAmbTmp : This setting is used to set the October month average ambient temperature.
NovAmbTmp : This setting is used to set the November month average ambient temperature.
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Bay control REC670
Application manual