ABB REG670 Applications Manual page 667

1MRK 502 071-UEN -
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
• 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 WdgTmConstMode setting is selected as User defined.
WdgTimeConst2: This setting is used to get the winding time constant for winding 2.
This is used when the WdgTmConstMode setting is selected as User defined.
WdgTimeConst3: This setting is used to get the winding time constant for winding 3.
This is used when the WdgTmConstMode setting is selected as User defined.
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 WdgTmConstMode is selected for
calculation. This setting has 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.
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.
Section 17
Monitoring
661