Basler Electric BE1-11m - Manual (Page 534)

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Figure 346. Programmable Inputs, Remote RTD, RTD Block Configuration Screen
Protection - Thermal
Thermal Curve (49TC)
The 49TC element is the heart of the BE1-11m Motor Protection System. This equivalent current-based
element models the thermal capacity in the motor by using negative-sequence current, reduced voltage
(when custom curves are used), and RTD biasing (when a remote module is used).
Use the Settings Explorer in BESTCOMSPlus to open the Protection, Thermal, Thermal Curve (49TC)
screen and configure the following settings. See Figure 347.
Figure 347. Protection, Thermal, Thermal Curve (49TC) Screen
•
Mode - Standard Curve is used in this example.
•
K - The thermal model operates from equivalent motor current. The K setting determines how much
the negative-sequence current biases the effective current. K is used to determine the equivalent
current as shown in Equation 40. To match NEMA MG-1 standards, use a K factor of 8, unless
otherwise specified.
𝐼
𝑒𝑞
= 𝐼�1 + 𝑘 �
𝐼
2
𝐼
1
�
2
Equation 40. Equivalent Current
Settings Calculation Examples BE1-11m