Frequency Protection; Overview; Overfrequency Protection Saptof; Rate-Of-Change Frequency Protection Sapfrc - ABB Relion RES670 Operator's Manual

1MRK511251-UEN B
9.3.4
9.3.4.1
9.3.4.2
9.3.4.3
9.3.4.4
9.3.5
9.3.5.1
Operator's manual
Displays available settable parameters. The operation mode, the operate voltage as
percentage of Ubase are examples of the settings available here.

Frequency protection

Overview

For Frequency protection there are settings for Underfrequency, Overfrequency
and Rate of change of frequency. Each category has some instances of parameters.
All functions can be set On or Off and have a number of other settable parameters
such as rated voltage and time delay before tripping.

Overfrequency protection SAPTOF

Main menu/Settings/Setting Group/Frequency protection/
OverFrequency(PTOF,81)/SAPTOF:x
Displays available instances of SAPTOF with a number of settings per instance.
The settings are operation, start frequency, base voltage setting, internal blocking
level, operate time delay and reset time delay. For the Overfrequency function to
operate correctly the Operation setting must be On.

Rate-of-change frequency protection SAPFRC

Main menu/Settings/Setting Group N/Frequency protection/
RateOfChangeOfFrequency(PFRC,81)/SAPFRC:x
Displays available instances of SAPFRC with some settings per instance. The
settings include parameters such as operation, base voltage setting, start frequency,
internal blocking level, time delay to trip and frequency restoration.

Underfrequency protection SAPTUF

Main menu/Settings/Setting Group N/Frequency protection/
Underfrequency(PTUF,81)/SAPTUF:x
Displays available instances of SAPTUF with a number of settings per instance.
These include parameters like operation, base voltage, and start frequency. To
ensure the proper operation of the Underfrequency function the Operation setting
must be On.

Multipurpose protection

Overview
Under Multipurpose protection there are several instances of General current and
voltage parameters. This function has current and voltage inputs. The parameters
Read and change settings
Section 9
47