GE D60 Instruction Manual

Also see for D60: Communications manual Communications guide Instruction manual Instruction manual Instruction manual

Contents

5-172 D60 Line Distance Relay GE Multilin5.6 CONTROL ELEMENTS 5 SETTINGS5• AR 3-P DEAD TIME 3(4): These settings represent the dead time following the third(fourth) three-pole trip.• AR EXTEND DEAD T 1: This setting selects an operand that will adapt the duration of the dead time for the first shotto the possibility of non-simultaneous tripping at the two line ends. Typically this is the operand set when the communi-cation channel is out of service• AR DEAD TIME 1 EXTENSION: This timer is used to set the length of the dead time 1 extension for possible non-simultaneous tripping of the two ends of the line.• AR RESET: This setting selects the operand that forces the autoreclose scheme from any state to Reset. Typically thisis a manual reset from lockout, local or remote.• AR RESET TIME: A reset timer output resets the recloser following a successful reclosure sequence. The setting isbased on the breaker time which is the minimum time required between successive reclose sequences.• AR BKR CLOSED: This setting selects an operand that indicates that the breaker(s) are closed at the end of the resettime and the scheme can reset.• AR BLOCK: This setting selects the operand that blocks the Autoreclose scheme (it can be a sum of conditions suchas: time delayed tripping, breaker failure, bus differential protection, etc.). If the block signal is present before autore-close scheme initiation the AR DISABLED FlexLogic™ operand will be set. If the block signal occurs when the schemeis in the RIP state the scheme will be sent to Lockout.• AR PAUSE: The pause input offers the ability to freeze the autoreclose cycle until the pause signal disappears. Thismay be done when a trip occurs and simultaneously or previously, some conditions are detected such as out-of step orloss of guard frequency, or a remote transfer trip signal is received. When the ‘pause’ signal disappears the autore-close cycle is resumed. This feature can also be used when a transformer is tapped from the protected line and areclose is not desirable until the it is disconnected from the line. In this situation, the reclose scheme is ‘paused’ untilthe transformer is disconnected.• AR INCOMPLETE SEQ TIME: This timer is used to set the maximum time interval allowed for a single reclose shot. Itis started whenever a reclosure is initiated and is active until the CLOSE BKR1 or CLOSE BKR2 signal is sent. If all con-ditions allowing a breaker closure are not satisfied when this time expires, the scheme goes to “Lockout”. The mini-mum permissible setting is established by the AR 3-P DEAD TIME 2 timer setting. Settings beyond this will determine the‘wait’ time for the breaker to open so that the reclose cycle can continue and/or for the AR PAUSE signal to reset andallow the reclose cycle to continue and/or for the AR BKR1(2) BLK signal to disappear and allow the AR CLOSE BKR1(2)signal to be sent.• AR BLOCK BKR2: This input selects an operand that will block the reclose command for Breaker 2. This conditioncan be for example: breaker low air pressure, reclose in progress on another line (for the central breaker in a breakerand a half arrangement), or a sum of conditions combined in FlexLogic™.• AR CLOSE TIME BKR2: This setting represents the closing time for the Breaker 2 from the moment the ‘Close’ com-mand is sent to the moment the contacts are closed.• AR TRANSFER 1 TO 2: This setting establishes how the scheme performs when the breaker closing sequence is 1-2and Breaker 1 is blocked. When set to “Yes” the closing command will be transferred direct to Breaker 2 without wait-ing the transfer time. When set to “No” the closing command will be blocked by the AR BKR1 BLK signal and thescheme will be sent to Lockout by the incomplete sequence timer.• AR TRANSFER 2 TO 1: This setting establishes how the scheme performs when the breaker closing sequence is 2-1and Breaker 2 is blocked. When set to “Yes” the closing command will be transferred direct to Breaker 1 without wait-ing the transfer time. When set to “No”, the closing command will be blocked by the AR BKR2 BLK signal and thescheme will be sent to Lockout by the incomplete sequence timer.• AR BKR1 FAIL OPTION: This setting establishes how the scheme performs when the breaker closing sequence is 1-2 and Breaker 1 has failed to close. When set to “Continue” the closing command will be transferred to Breaker 2which will continue the reclosing cycle until successful (the scheme will reset) or unsuccessful (the scheme will go toLockout). When set to “Lockout” the scheme will go to lockout without attempting to reclose Breaker 2.• AR BKR2 FAIL OPTION: This setting establishes how the scheme performs when the breaker closing sequence is 2-1 and Breaker 2 has failed to close. When set to “Continue” the closing command will be transferred to Breaker 1which will continue the reclosing cycle until successful (the scheme will reset) or unsuccessful (the scheme will go toLockout). When set to “Lockout” the scheme will go to lockout without attempting to reclose Breaker 1.• AR 1-P DEAD TIME: Set this intentional delay longer than the estimated de-ionizing time after the first single-pole trip.