Single- And/Or Three-Pole Tripping - Hitachi Relion 670 Series Applications Manual

1MRK511407-UUS Rev. N
15.1.3.2

Single- and/or three-pole tripping

The single-/three-pole tripping operation mode will give single-pole tripping for single-phase faults and
three-pole tripping for multi-phase fault. This operating mode is always used together with a single-phase
autoreclosing scheme.
The single-pole tripping can include different options and the use of the different inputs in the function
block. Inputs TRINP_A, TRINP_B, and TRINP_C shall be used for trip signals from functions with built-in
pole selection logic such as distance or line differential protection functions.
The inputs 1PTRZ and 1PTRGF are used for single-pole tripping from functions which do not have built-
in pole selection logic:
• 1PTRZ can be connected to the carrier aided trip signal from the distance protection scheme (it
means that another distance protection function has seen or detected the fault)
• 1PTRGF can be connected to an earth fault function such as EF4PTOC or a carrier aided trip signal
from the earth fault protection scheme
These two inputs are combined with the external phase selection logic. Phase selection signals from the
external phase selector must be connected to the inputs PS_A, PS_B, and PS_C to achieve the tripping
on the respective single-pole trip outputs TR_A, TR_B, and TR_C. The output TRIP is a general trip and
is always activated independent of which phase is involved. Depending on which phases are involved the
outputs TR1P and TR3P will be activated as well.
When single-pole tripping schemes are used, a single-phase autoreclosing attempt is expected to follow.
For cases where the autoreclosing is not in service or will not follow for some reason, the input prepare
three-pole trip P3PTR must be activated. This input is normally connected to the output PREP3P on the
autorecloser function SMBRREC (79) but can also be connected to other signals, for example, an
external logic signal. If two circuit breakers are involved, one SMPPTRC block instance and one
SMBRREC (79) instance are used for each circuit breaker. This will ensure correct operation and
behavior of each circuit breaker.
The output TR3P must be connected to the input TR3P on the SMBRREC (79) function in order to switch
SMBRREC (79) to perform a three-pole reclosing. If this signal is not activated, SMBRREC will use
single-pole dead time.
Other back-up functions are connected to the input TRINP_3P as described above for three-pole tripping.
A typical connection for a single-pole tripping scheme is shown in figure 85.
Phasor measurement unit RES670
Application manual
If a second line protection is utilizing the same SMBRREC (79), the three-pole trip signal must
be generated as OR conditions from both line protections.
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Section 15
Logic
M14828-11 v9
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