5-130 L60 Line Phase Comparison System GE Multilin5.5 GROUPED ELEMENTS 5 SETTINGS5j) OPEN BREAKER ECHOPATH: SETTINGS GROUPED ELEMENTS PHASE COMPARISON ELEMENTS OPEN BREAKER ECHOAs operation of the permissive tripping mode of phase comparison protection and tripping of the line is fundamentallydependent on transmitting the signal to the remote end of the line, some cases of system operating conditions requireattention:1. If a line is open at one end, the phase comparison element is unable to detect an internal fault and give trip permissionto the remote terminal relay.2. A weak-infeed or no fault infeed at one end of the faulted line may prevent phase comparison element trip. Conse-quently, instant conversion from weak-infeed logic with sending permissive continuous signal to fault logic with sendingsquare waves is required in case of the external fault at the adjacent or internal fault for proper operation of phasecomparison relay at the remote line's terminal.The open breaker echo element should be applied to any particular application according to local system conditions. Theelement settings are described below:• OPEN BREAKER KEYING: Disables/enables the open breaker keying feature.• BRK 1 AUX CONTACT: Assigns a FlexLogic™ operand to control open/close state of breaker 1 with either 52a or 52btype contact to create logic “1” when the breaker is open.• BRK 1 CONT SUPV: Selects a supervising element such as a test/normal switch usually used in breaker 1 controlschemes or any other elements. If no element is required, the default value “Off” should be used.• BRK 2 AUX CONTACT: If supervision of two breakers is required, this setting is used to assign a FlexLogic™ operandto control open/close state of the Breaker #2 with either 52a or 52b type contact to create logic “1” when the breaker isopen.• BRK 2 CONT SUPV: Selects a supervising element such as a test/normal switch usually used in breaker 2 controlschemes or any other elements. If no element is required, the default value “Off” should be used.• OPEN BREAKER KEYING PKP DELAY: Delays the operation of open breaker keying to override disagreementbetween main and auxiliary contacts of the breaker or any other operating conditions. OPEN BREAKER ECHOOPEN BREAKER KEYING:DisabledRange: Disabled, EnabledMESSAGE BRK 1 AUX CONTACT:OffRange: FlexLogic™ operandMESSAGE BRK 1 CONT SUPV:OffRange: FlexLogic™ operandMESSAGE BRK 2 AUX CONTACT:OffRange: FlexLogic™ operandMESSAGE BRK 2 CONT SUPV:OffRange: FlexLogic™ operandMESSAGE OPEN BREAKER KEYINGPKP DELAY: 0.000 sRange: 0.000 to 50.000 s in steps of 0.001MESSAGE OPEN BREAKER KEYINGRST DELAY: 0.000 sRange: 0.000 to 50.000 s in steps of 0.001MESSAGE WEAK-INFEED KEYING:OffRange: FlexLogic™ operandMESSAGE WEAK-INFEED SUPV:OffRange: FlexLogic™ operandMESSAGE WEAK-INFEED PICKUPDELAY: 0.000 sRange: 0.000 to 50.000 s in steps of 0.001MESSAGE WEAK-INFEED RESETDELAY: 0.035 sRange: 0.000 to 50.000 s in steps of 0.001
