5-108 D30 Line Distance Protection System GE Multilin5.4 SYSTEM SETUP 5 SETTINGS5• SWITCH 1 MODE: This setting selects “3-Pole” mode, where disconnect switch poles have a single common auxiliaryswitch, or “1-Pole” mode where each disconnect switch pole has its own auxiliary switch.• SWITCH 1 OPEN: This setting selects an operand that when activated, and unless blocked, initiates the disconnectswitch 1 open command.• SWITCH 1 BLK OPEN: This setting selects an operand that prevents initiation of the disconnect switch 1 command.This setting can be used for blocking disconnect switch opening for instance when switchyard monitoring indicates cur-rent exceeding the switch's interrupting rating can be flowing through the switch.• SWITCH 1 CLOSE: This setting selects an operand that when activated, and unless blocked, initiates the disconnectswitch 1 close command.• SWITCH 1 BLK CLOSE: This setting selects an operand that prevents initiation of disconnect switch 1 close com-mands. This setting can be used for blocking disconnect switch closing, for instance to prevent closing into a closedground switch.• SWTCH 1 ΦA/3P CLSD: This setting selects an operand, usually a contact input connected to a disconnect switchauxiliary position tracking mechanism. This input is for a normally-open 89/a status input that creates a logic 1 whenthe disconnect switch is closed. If the SWITCH 1 MODE setting is selected as “3-Pole”, this setting selects a single 89/ainput as the operand used to track the disconnect switch open or closed position. If the mode is selected as “1-Pole”,the input mentioned above is used to track phase A and the SWITCH 1 ΦB and SWITCH 1 ΦC settings select operands totrack phases B and C, respectively.• SWTCH 1 ΦA/3P OPND: This setting selects an operand, usually a contact input, that is for a normally-closed 89/bstatus input that creates a logic 1 when the disconnect switch is open. If a separate 89/b contact input is not available,then an inverted 89/a status signal can be used.• SWITCH 1 ΦB CLOSED: If the mode is selected as three-pole, this setting has no function. If the mode is selected assingle-pole, this input is used to track the disconnect switch phase B closed position as above for phase A.• SWITCH 1 ΦB OPENED: If the mode is selected as three-pole, this setting has no function. If the mode is selected assingle-pole, this input is used to track the disconnect switch phase B opened position as above for phase A.• SWITCH 1 ΦC CLOSED: If the mode is selected as three-pole, this setting has no function. If the mode is selected assingle-pole, this input is used to track the disconnect switch phase C closed position as above for phase A.• SWITCH 1 ΦC OPENED: If the mode is selected as three-pole, this setting has no function. If the mode is selected assingle-pole, this input is used to track the disconnect switch phase C opened position as above for phase A.• SWITCH 1 TOPERATE: This setting specifies the required interval to overcome transient disagreement between the89/a and 89/b auxiliary contacts during disconnect switch operation. If transient disagreement still exists after this timehas expired, the SWITCH 1 BAD STATUS FlexLogic operand is asserted for alarm or blocking purposes.• SWITCH 1 ALARM DELAY: This setting specifies the delay interval during which a disagreement of status among thepole position tracking operands will not declare a pole disagreement. This allows for non-simultaneous operation of thepoles.IEC 61850 functionality is permitted when the D30 is in “Programmed” mode and not in the local control mode.NOTE
