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Instructional Literature
Page
116
Effective: May 2008
Instructions for the FP-6000 Protective Relay
For more information visit: www.eaton.com
IB02602004E
Shot x Prot Setting Menu
Shot x Protection Settings Menu where x is from 1 to 4. There is
one group of the protection settings dedicated to each shot.
When the autoreclose process is in shot x stage, this group of the
protection settings will substitute those corresponding settings of
the normal protection settings.
Note:
Four shot protection setting groups must be specified as long as
the autoreclose function or the auto zone sequence coordination feature is
enabled.
SH x Offtime & SetGrp
Shot x Breaker Off Time and Set Group.
SHx OffTime
Shot x Breaker Off Time T2. This setting specifies the breaker off
time in cycles that must be greater than the breaker dead time.
The breaker off time in the autoreclose application is defined as
the interval between the instant when the autoreclose process is
initiated and the instant when a reclose request is issued. The
breaker dead time is defined as the interval between interruption
in all poles on the opening stroke and reestablishment of the
circuit on the reclosing stroke.
In the autoreclose application, this setting must be set longer
than a sum of the breaker opening time, the breaker arcing time,
the time for the breaker to fully open after arcing being
extinguished, the power line de-ionizing time, the time for the
breaker to reset its mechanism, the time for the breaker to
prepare a closing action (energizing the closing coil), and a safety
margin.
In the auto zone sequence coordination application, this setting is
set the same way as in the autoreclose application, but an extra
care must be taken. The user must be concerned with not only
the local breaker but also the downstream breakers. The breaker
off time must be set greater than any breaker off times in the
coordination.
Another factor that needs to be considered for this setting is the
relay processing limit, which is related to the next setting Set
Group. If the relay needs to switch between the normal
protection setting groups, it will take some time to process this
task. Therefore, to make sure the autoreclose shot has the
intended protection settings, the breaker off time must be set no
less than 2 cycles. If shot x off time is set to disable, the
maximum shots the autoreclose logic may have will be (x-1). The
breaker off timer starts running at the instant where the
autoreclose Run mode is initiated and a reclosing command is
issued when the breaker off timer is expired.
Note that this setting is one of the most important settings in the
autoreclose function. When choosing this setting, one must pay
extra attention to several aspects such as: the circuit breaker
characteristic; the protection functions used; the power system
protected (voltage level, overhead or cable, stability and etc.);
and impacts on loads.
Set Group
Shot x Protection Set Group. In the FP-6000, there are four
groups of the normal protection settings and there is only one
group active at any given time. This setting allows the user to
select a base for this shot protection setting group. The setting
can be Active (the normal setting active setting group before a
reclosing process is initiated), or the normal setting group one to
four. If Active or the set group number that happens to be the
normal active setting group is selected, the relay does not need
to switch the normal protection setting groups. Thus, it has no
extra requirement for the setting breaker off time. However, if
other set group is selected, the relay will need extra time to
process the normal setting group switching that may take up to 2
cycles, and the breaker off time must take this into account.
The shot setting group switching is processed as follows:
•
If the set group selected is different from the normal active
protection group (before a reclosing process is initiated), the
relay will switch the normal active protection group to the
selected group and then take it as a base to modify the
following settings; otherwise the relay will directly modify the
following settings by assuming the currently active setting
group as a base.
To have a high speed reclosing, Active is recommended.
50X-1 Trip
Shot x Block 50X-1. This setting allows the relay to block or
unblock 50X-1 instantaneous overcurrent function or modify its
delay during shot x. If it is Blocked, 50X-1 will be disabled during
shot x; if it is unblocked, 50X-1 will be enabled during shot x; if it
is set to any value (0 to 60 cycles), 50X-1 will have the same
pickup threshold as it is set in the normal protection group but
with a new delay.
50X-2 Trip
Shot x Block 50X-2. This setting allows the relay to block or
unblock 50X-2 instantaneous overcurrent function or modify its
delay during shot x. The same criteria as 50X-1 Trip.
50X-3 Trip
Shot x Block 50X-3. This setting allows the relay to block or
unblock 50X-3 instantaneous overcurrent function or modify its
delay during shot x. The same criteria as 50X-1 Trip.
50R-1 Trip
Shot x Block 50R-1. This setting allows the relay to block or
unblock 50R-1 residual instantaneous overcurrent function or
modify its delay during shot x. The same criterion as 50X-1 Trip.
50R-2 Trip
Shot x Block 50R-2. This setting allows the relay to block or
unblock 50R-2 residual instantaneous overcurrent function or
modify its delay during shot x. The same criteria as 50X-1 Trip.
50R-3 Trip
Shot x Block 50R-3. This setting allows the relay to block or
unblock 50R-3 residual instantaneous overcurrent function or
modify its delay during shot x. The same criterion as 50X-1 Trip.