Thermal Overload Protection, 3-Phase - Advanced; Overview Of Functions; Structure Of The Function; Filter For Rms Value Gain - Siemens 6MD85 Manual

Siprotec 5 high-voltage bay controller

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Table of Contents

Protection and Automation Functions

7.26 Thermal Overload Protection, 3-Phase - Advanced

Thermal Overload Protection, 3-Phase - Advanced

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

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 7-186

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

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.

Structure/Embedding of the Function

SIPROTEC 5, High-Voltage Bay Controller, Manual

C53000-G5040-C015-9, Edition 11.2017