ABB Relion REG670, Applications Manual

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The following settings are required to perform the insulation loss of life calculation:
EnaAgeCalc : This setting is used to enable or disable the transformer insulation loss
of life calculation. It has the following options:
• Enable : Transformer insulation age calculation is enabled.
• Disable : Transformer insulation age calculation is disabled. The function only
calculates up to hot spot temperature and age calculation will not take place.
InitialLife : This setting is used to set the transformer initial insulation loss of life. This
should be set before implementing the function in service. If it is a newly installed
transformer, this setting should be set as zero hours and if it is previously installed
transformer then, the user should predetermine the transformer insulation life
consumed in hours and set it. If the transformer insulation loss of life value will start
from this value and at any time the insulation loss of life value can be reset with this
value by activating LOLRST from local HMI reset menu.
ExpectedLife : The transformer expected insulation life in hours can be set by this
setting. As per IEEE C57.91-1995 the normal life expectancy at a continuous hot spot
temperature of 110 ̊ C is 180,000 Hours.
AgeingRateMeth : This setting is used to select the method to be used for transformer
insulation relative ageing rate calculation between IEC standard method and IEEE
standard method. It has the following options:
• IEC : Transformer insulation age calculation based on IEC standard method.
• IEEE : Transformer insulation age calculation based on IEEE standard method.
ThermalUpgrade : This setting is used to select the transformer insulation paper type
between thermally upgraded insulation and normal insulation. It has the following
options:
• Upgraded : The function considers the given transformer has thermally upgraded
paper insulation.
• Normal : The function considers the given transformer has normal insulation.
TimeToUpdate : This setting is used to set the time interval for updating the
transformer insulation loss of life calculation outputs LOLINDAY and LOLINYRS.
It can be selected as 1 hour/ 2 hour/ 4 hour/ 8 hour/ 12 hour/ 24 hour depending on user
requirement.
Two settable warning levels are available for hot spot temperature with separate
outputs. If warning level exceeds for the set time, an alarm is generated.
IEEE C57.96-1995 has suggested maximum temperature limits for the four types of
loading, see table
71 .
Section 17
1MRK 502 071-UEN -
Monitoring
664 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual