ABB Relion 670 Series Applications Manual page 246

Section 11
Multipurpose protection
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2. Two undercurrent steps with the following built-in features:
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3. Two overvoltage steps with the following built-in features
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4. Two undervoltage steps with the following built-in features
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All these four protection elements within one general protection function works independently
from each other and they can be individually enabled or disabled. However, note that all these four
protection elements measure one selected current quantity and one selected voltage quantity (see
table 29
individual stages. Sometimes, it is necessary to provide interaction between two or more
protection elements/stages within one CVGAPC function by appropriate IED configuration to
obtain desired application functionality.
11.1.2.1 Current and voltage selection for CVGAPC function
CVGAPC function is always connected to three-phase current and three-phase voltage input in the
configuration tool, but it will always measure only the single current and the single voltage
quantity selected by the end user in the setting tool.
The user can select a current input, by a setting parameter
current quantities shown in table 29.
Table 29: Available selection for current quantity within CVGAPC function
Set value for parameter
"CurrentInput"
1 PhaseA
PhaseB
2
PhaseC
3
4 PosSeq
NegSeq
5
3 · ZeroSeq
6
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Definite time delay or Inverse Time Overcurrent (TOC/IDMT) delay for both steps
Second harmonic supervision is available in order to only allow operation of the
overcurrent stage(s) if the content of the second harmonic in the measured current is
lower than pre-set level
Directional supervision is available in order to only allow operation of the overcurrent
stage(s) if the fault location is in the pre-set direction (
during low-level polarizing voltage is settable (
Voltage restrained/controlled feature is available in order to modify the pick-up level of
the overcurrent stage(s) in proportion to the magnitude of the measured voltage
Current restrained feature is available in order to only allow operation of the overcurrent
stage(s) if the measured current quantity is bigger than the set percentage of the
current restrain quantity.
Definite time delay for both steps
Definite time delay or Inverse Time Overcurrent TOC/IDMT delay for both steps
Definite time delay or Inverse Time Overcurrent TOC/IDMT delay for both steps
and table 30). It is possible to simultaneously use all four protection elements and their
Comment
CVGAPC function will measure the phase A current phasor
CVGAPC function will measure the phase B current phasor
CVGAPC function will measure the phase C current phasor
CVGAPC function will measure internally calculated positive sequence current
phasor
CVGAPC function will measure internally calculated negative sequence current
phasor
CVGAPC function will measure internally calculated zero sequence current
phasor multiplied by factor 3
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Forward or Reverse ). Its behavior
Non-Directional , Block , Memory )
CurrentInput , to measure one of the
1MRK 511 401-UUS F
SEMOD53443-6 v4
Bay control REC670
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