9.3.5.6
Two step undervoltage protection UV2PTUV (27)
Main menu/Settings/Setting Group N/Voltage protection/
UnderVoltage2Step(PTUV,27)/TUV
Displays available settable parameters. The operation mode, the operate voltage as
percentage of
UbaseVbase
are examples of the settings available here.
9.3.5.7
Voltage differential protection VDCPTOV (60)
Main menu/Settings/Setting Group N/Voltage protection/VoltageDiff(PTOV,60)/
VDC
Includes settings for voltage difference and timers.
9.3.6
Frequency protection
9.3.6.1
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.
9.3.6.2
Overfrequency protection SAPTOF (81)
Main menu/Settings/Setting Group/Frequency protection/OverFrequency(PTOF,
81)/TOF
Displays available instances of SAPTOF (81) with a number of settings per instance.
The settings are operation, pickup 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
.
9.3.6.3
Rate-of-change frequency protection SAPFRC (81)
Main menu/Settings/Setting Group N/Frequency protection/
RateOfChangeOfFrequency(PFRC,81)/RCF
Displays available instances of SAPFRC (81) with some settings per instance. The
settings include parameters such as operation, base voltage setting, pickup frequency,
internal blocking level, time delay to trip and frequency restoration.
Section 9
1MRK506276-UUS B
Read and change settings
60
Operator's manual
