Setting Guidelines; Equipment Protection, Transformers; Power Supply Quality; The Following Settings Can Be Done For The Two Step Overvoltage Protection - ABB RER670 Applications Manual

1MRK 506 375-UEN A
9.2.3
9.2.3.1
9.2.3.2
9.2.3.3
Railway application RER670 2.2 IEC
Application manual

Setting guidelines

The parameters for two step overvoltage protection (O2RWPTOV) are set via the
local HMI or Protection and Control Manager PCM600.
All the voltage conditions in the system where O2RWPTOV performs its functions
should be considered. The same also applies to the associated equipment, its
voltage and time characteristic.
There are wide applications where general overvoltage functions are used. All
voltage related settings are made as a percentage of a settable base primary voltage,
which is normally set to the nominal voltage level (phase-to-phase) of the power
system.
The time delay for the O2RWPTOV can sometimes be critical and related to the
size of the overvoltage - a power system or a high voltage component can
withstand smaller overvoltages for some time, but in case of large overvoltages the
related equipment should be disconnected more rapidly.
Some applications and related setting guidelines for the voltage level are given
below:

Equipment protection, transformers

High voltage will cause overexcitation of the core and deteriorate the winding
insulation. The setting has to be well above the highest occurring "normal" voltage
and well below the highest acceptable voltage for the equipment.

Power supply quality

The setting has to be well above the highest occurring "normal" voltage and below
the highest acceptable voltage, due to regulation, good practice or other
agreements.
The following settings can be done for the two step overvoltage
protection
Common base IED values for primary current (IBase), primary voltage (UBase)
and primary power (SBase) are set in the global base values for settings function
GBASVAL.
GlobalBaseSel: This is used to select GBASVAL function for reference of base
values.
ConnType: This is used to set whether the measurement shall be phase-to-earth
fundamental value, phase-to-phase fundamental value, phase-to-earth true RMS
value or phase-to-phase true RMS value.
Operation: This is used for two step overvoltage protection Off/On.
Section 9
Voltage protection
M13852-4 v10
M13852-10 v3
M13852-16 v1
M13852-22 v10
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