ABB Relion 670 Series Applications Manual page 485

1MRK 511 401-UUS F
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.
WdgTmConstMode : This setting is used to select the winding time constant mode of input to the
function. It has three options:
• Standard : Winding time constant is taken from the IEEE or IEC standard as selected for the
temperature calculations.
User defined : Winding time constant is provided by the user through setting. The value may
•
be given by the transformer manufacturer.
Calculated : Winding time constant is calculated by the function based on the transformer
•
parameters given by the user.
WdgTimeConst1 : This setting is used to get the winding time constant for winding 1. This is used
when the
WdgTimeConst2 : This setting is used to get the winding time constant for winding 2. This is used
when the
WdgTimeConst3 : This setting is used to get the winding time constant for winding 3. This is used
when the
The winding time constant is likely to be in the order of 5 to 20 minutes.
ConductorType : This setting is used to select the winding material between copper and aluminum.
This setting is useful when setting
two options:
Copper : Winding material is selected as copper.
•
Aluminum : Winding material is selected as aluminum.
•
Winding to oil temperature gradient differs from winding to winding depending on current density
in the winding, physical dimensions, cooling system etc., This value can be between 10 to 20 ̊ C for
both distribution and power transformers. For low current density winding it can be 10 ̊ C and for
high current density winding it can be 20 ̊ C. The settings given below are also used for the
calculation of winding time constant.
WdgToOilGrad1 : Winding to oil temperature gradient for the winding 1 at rated load.
WdgToOilGrad2 : Winding to oil temperature gradient for the winding 2 at rated load.
WdgToOilGrad3 : Winding to oil temperature gradient for the winding 3 at rated load.
CuLossW1 : This setting is used to set the winding loss at rated load for the winding 1.
CuLossW2 : This setting is used to set the winding loss at rated load for the winding 2.
Bay control REC670
Application manual
WdgTmConstMode setting is selected as User defined .
WdgTmConstMode setting is selected as User defined .
WdgTmConstMode setting is selected as User defined .
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WdgTmConstMode is selected for calculation. This setting has
Section 17
Monitoring
GUID-BDD32D22-D1C2-47C2-9B4C-A055C847CCA2 v1
GUID-5832E7AF-0A4F-4B50-8045-94BF9433A1BF v1
479