GUID-E040FFF4-7FE3-4736-8E5F-D96DB1F1B16B V1 EN
Figure 119: Effect of the Weighting factor p factor and the difference between
the two time constants and one time constant models
The actual temperature of the transformer is calculated by adding the ambient
temperature to the calculated temperature.
GUID-77E49346-66D2-4CAB-A764-E81D6F382E74 V2 EN (Equation 9)
Θ temperature in transformer (°C)
ΔΘ calculated temperature rise (°C) in transformer
Θ
amb
set value of the
Env temperature Set
setting or measured ambient temperature
The ambient temperature can be measured with RTD measurement. The measured
temperature value is connected, for example, from the AI_VAL3 output of the
X130 (RTD) function to the AMB_TEMP input of T2PTTR.
The Env temperature Set setting is used to define the ambient temperature if the
ambient temperature measurement value is not connected to the AMB_TEMP input.
The Env temperature Set setting is also used when the ambient temperature
measurement connected to T2PTTR is set to “Not in use” in the X130 (RTD) function.
The temperature calculation is initiated from the value defined with the Initial
temperature and Max temperature setting parameters. The initial value is a
percentage of Max temperature defined by Initial temperature. This is done when
the IED is powered up or the function is turned off and back on or reset through the
1YHT530004D05 D Section 4
Protection functions
615 series 235
Technical Manual
To Next Page
Loading...
Need help?
General
