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6.19
Thermal Overload Protection, 3-Phase - Advanced
Overview of Functions
6.19.1
The Thermal overload protection, 3-phase – advanced function (ANSI 49) is used to:
•
Protect the equipment (motors, generators, transformers, capacitors, overhead lines, and cables) against
thermal overloads
•
Monitor the thermal state of motors, generators, transformers, capacitors, overhead lines, and cables
Structure of the Function
6.19.2
The Thermal overload protection, 3-phase – advanced function is used in protection function groups with
current measurement.
The function is preconfigured by the manufacturer with 1 Thermal overload protection, 3-phase –
advanced stage.
The non-preconfigured function block Filter can optionally be applied to gain the RMS value used by the
Thermal overload protection, 3-phase – advanced stage.
[dw_TOLP_with Filter stage, 2, en_US]
Figure 6-162
Filter for RMS Value Gain
6.19.3
Description
6.19.3.1
The function block Filter can be used to adapt the RMS value for 2 means:
•
To gain harmonics in a defined way. Higher harmonics can stress the protected object thermally more
than lower harmonics. This is the case for reactors applied in AC filters. In addition, the amplitude attenu-
ation of higher frequencies due to the anti-aliasing filter of the device is automatically compensated by
the filter
•
To only compensate the amplitude attenuation of higher frequencies by the device (due to the anti-
aliasing filter)
The filter gain (amplitude response) is realized by a 9-order FIR filter.
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
Structure/Embedding of the Function
Protection and Automation Functions
6.19 Thermal Overload Protection, 3-Phase - Advanced
651
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