Selection Of Setting Groups - GE MiCOM P40 Agile Technical Manual

Setting
MiCOM P40 Agile P442, P444
appropriate setting group can be selected as required. This facility is extremely useful in the
case of unattended substations where all of the switching can be controlled remotely.
Feeder 1
Figure 1 - Typical Double Bus Installation with Bypass Facilities
A further use for this feature is the ability to provide alternative settings for teed feeders or
double circuit lines with mutual coupling. Similar alternative settings could be required to
cover different operating criteria in the event of the channel failing, or an alternative system
configuration (ie. lines being switched in or out).
1.2.2

Selection of Setting Groups

Setting groups can be changed by one of two methods:
Automatic group selection by state changes of two opto-isolated inputs, assigned to Setting
Group Change bit 0 (opto 1), and Setting Group Change bit 1 (opto 2), as shown in Table 1
below. The new setting group binary code must be maintained for 2 seconds before a group
change is implemented, therefore rejecting spurious induced interference. (See also
hysteresis value for logic level 0 & logic level 1 in section 4.1 of this document).
When this selection is made, the two opto-isolated inputs assigned to this function are opto
inputs 1 and 2 and they must not be connected to any output signal in the PSL.
Special care should be taken to avoid using them for another purpose (i.e please note that in
the default PSL they have been used for another functions: DIST/DEF Chan. Recv. for opto
1 and DIST/DEF carrier out of service for opto 2).
Default PSL: To enable the setting group via logic inputs, the opto inputs 1 and 2 must be
dedicated only to the group selection (remove Opto-Label 01 and Opto-Label 02 from the
PSL). (If assigned in the PSL, instead of Dist DEF Carrier Receive Logic Start, a setting
group change occurs)
Note that each setting group has its own dedicated PSL, which should be configured and
sent to the relay independently.
Or using the relay operator interface / remote communications. Should the user issue a
menu command to change group, the relay transfers to that settings group, and then ignores
future changes in state of the bit 0 and bit 1 opto inputs. Therefore, the user is given greater
priority than automatic setting group selection.
Reserve bus (2)
21
(1)
Main bus
21
P440
Feeder 2
P44x/EN ST/Hb6
(ST) 4-11
21
P3077ENa