Displays 42 settable parameters. The operation mode, the voltage as percentage of
Ubase are examples of the settings available here.
9.3.5.3
Two step overvoltage protection (POVM, 59)
Settings/Setting Group N/Voltage protection/OverVoltage2Step(POVM)
Displays 34 settable parameters including settings for IDMT curves and other
function related settings.
9.3.5.4
Two step residual overvoltage protection (POVM, 59N)
Settings/Setting Group N/Voltage protection/
ResidualOverVoltage2Step(POVM)
Displays up to 33 settable parameters for setting two characteristics and many related
parameters.
9.3.5.5
Overexcitation protection (PVPH, 24)
Settings/Setting Group N/Voltage protection/Overexcitation(PVPH)
Displays settable parameters for operation, rated current and voltage, time delays for
user designed curves and several other related settings.
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 six 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
Underfrequency protection (PTUF, 81)
Settings/Setting Group N/Frequency protection/Underfrequency
Displays six instances of TUF with eight 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. Once
changes have been made to settings, it is essential that these changes are properly
saved in the IED.
9.3.6.3
Overfrequency protection (PTOF, 81)
Settings/Setting Group/Frequency protection/Overfrequency
Section 9
Read and change settings
RET 670
Operator's manual
1MRK504049-UEN rev. D
49