GE MiCOM P40 Agile Technical Manual

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Setting P44x/EN ST/Hb6MiCOM P40 Agile P442, P444 (ST) 4-11appropriate setting group can be selected as required. This facility is extremely useful in thecase of unattended substations where all of the switching can be controlled remotely.Feeder 121 2121Feeder 2P3077ENaMain busReserve bus (2)P440(1)Figure 1 - Typical Double Bus Installation with Bypass FacilitiesA further use for this feature is the ability to provide alternative settings for teed feeders ordouble circuit lines with mutual coupling. Similar alternative settings could be required tocover different operating criteria in the event of the channel failing, or an alternative systemconfiguration (ie. lines being switched in or out).1.2.2 Selection of Setting GroupsSetting groups can be changed by one of two methods:Automatic group selection by state changes of two opto-isolated inputs, assigned to SettingGroup Change bit 0 (opto 1), and Setting Group Change bit 1 (opto 2), as shown in Table 1below. The new setting group binary code must be maintained for 2 seconds before a groupchange is implemented, therefore rejecting spurious induced interference. (See alsohysteresis 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 optoinputs 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 inthe default PSL they have been used for another functions: DIST/DEF Chan. Recv. for opto1 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 bededicated only to the group selection (remove Opto-Label 01 and Opto-Label 02 from thePSL). (If assigned in the PSL, instead of Dist DEF Carrier Receive Logic Start, a settinggroup change occurs)Note that each setting group has its own dedicated PSL, which should be configured andsent to the relay independently.Or using the relay operator interface / remote communications. Should the user issue amenu command to change group, the relay transfers to that settings group, and then ignoresfuture changes in state of the bit 0 and bit 1 opto inputs. Therefore, the user is given greaterpriority than automatic setting group selection.