ABB RELION 620 Series Technical Manual page 221

1MAC504801-IB E
620 series ANSI
Technical Manual
Table 162: Relay characteristic angle control in the IoSin and IoCos operation criteria
Operation mode:
IoSin
IoCos
When the Iosin(φ) or Iocos(φ) criterion is used, the component indicates a forward- or
reverse-type fault through the FAULT_DIR and DIRECTION outputs, in which 1 equals
a forward fault and 2 equals a reverse fault. Directional operation is not allowed (the Allow
non dir setting is "False") when the measured polarizing or operating quantities are not
valid, that is, when their magnitude is below the set minimum values. The minimum
values can be defined with the Min trip current and Min trip voltage settings. In case of
low magnitude, the FAULT_DIR and DIRECTION outputs are set to 0 = unknown,
except when the Allow non dir setting is "True". In that case, the function is allowed to
operate in the directional mode as non-directional, since the directional information is
invalid.
The calculated Iosin(φ) or Iocos(φ) current used in direction determination can be read
through the I_OPER monitored data. The value can be passed directly to a decisive
element, which provides the final pickup and trip signals.
The I_OPER monitored data gives an absolute value of the calculated
current.
The following examples show the characteristics of the different operation criteria:
Example 1.
Iosin(φ) criterion selected, forward-type fault
=> FAULT_DIR = 1
RCA_CTL = "False"
Actual operation criterion: Iosin(φ)
Actual operation criterion:
Iocos(φ)
Section 4
Protection functions
RCA_CTL = "True"
Actual operation criterion:
Iocos(φ)
Actual operation criterion: Iosin(φ)
215