and
Min operate 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 start and operate 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
Figure 149: Operating characteristic Iosin(φ) in forward fault
The operating sector is limited by angle correction, that is, the operating sector is
180 degrees - 2*(angle correction).
Example 2.
Iosin(φ) criterion selected, reverse-type fault
=> FAULT_DIR = 2
1MRS758755 C
Protection functions
REC615 & RER615
Technical Manual
311
To Next Page
Loading...
