5-88 D30 Line Distance Protection System GE Multilin5.4 SYSTEM SETUP 5 SETTINGS5• SWITCH 1 OPEN: This setting selects an operand that creates a programmable signal to operate an output relay toopen disconnect switch 1.• SWITCH 1 BLK OPEN: This setting selects an operand that prevents opening of the disconnect switch. This settingcan be used for select-before-operate functionality or to block operation from a panel switch or from SCADA.• SWITCH 1 CLOSE: This setting selects an operand that creates a programmable signal to operate an output relay toclose disconnect switch 1.• SWITCH 1 BLK CLOSE: This setting selects an operand that prevents closing of the disconnect switch. This settingcan be used for select-before-operate functionality or to block operation from a panel switch or from SCADA.• SWTCH 1 A/3P CLSD: This setting selects an operand, usually a contact input connected to a disconnect switchauxiliary position tracking mechanism. This input should be a normally-open 52/a status input to create a logic 1 whenthe disconnect switch is closed. If the SWITCH 1 MODE setting is selected as “3-Pole”, this setting selects a single inputas the operand used to track the disconnect switch open or closed position. If the mode is selected as “1-Pole”, theinput mentioned above is used to track phase A and the SWITCH 1 B and SWITCH 1 C settings select operands totrack phases B and C, respectively.• SWITCH 1 A/3P OPND: This setting selects an operand, usually a contact input, that should be a normally-closed52/b status input to create a logic 1 when the disconnect switch is open. If a separate 52/b contact input is not avail-able, then the inverted SWITCH 1 CLOSED status signal can be used.• SWITCH 1 B 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 B 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 C 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 C 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 the 52/aand 52/b auxiliary contacts during disconnect switch operation. If transient disagreement still exists after this time hasexpired, the SWITCH 1 BAD STATUS FlexLogic operand is asserted from alarm or blocking purposes.• SWITCH 1 ALARM DELAY: This setting specifies the delay interval during which a disagreement of status among thethree-pole position tracking operands will not declare a pole disagreement. This allows for non-simultaneous operationof the poles.IEC 61850 functionality is permitted when the D30 is in “Programmed” mode and not in the local control mode.NOTE
