• CBREADY, CB ready for a reclosing cycle, for example, charged operating gear.• CBPOS to ensure that the CB was closed when the line fault occurred and start wasapplied.• No signal at input INHIBIT that is, no blocking or inhibit signal present. After the start hasbeen accepted, it is latched in and an internal signal “Started” is set. It can be interruptedby certain events, like an “Inhibit” signal.12.2.2.3 Start auto-reclosing from CB open information M12391-100 v5If a user wants to initiate auto-reclosing from the "CB open" position instead of fromprotection trip signals, the function offers such a possibility. This starting mode is selectedwith the setting parameterStartByCBOpen=On. It is then necessary to block reclosing for allmanual trip operations. TypicallyCBAuxContType=NormClosed is also set and a CB auxiliarycontact of type NC (normally closed) is connected to inputs CBPOS and START. When thesignal changes from “CB closed” to “CB open” an auto-reclosing start pulse is generated andlatched in the function, subject to the usual checks. Then the reclosing sequence continues asusual. One needs to connect signals from manual tripping and other functions, which shall notbe reclosed automatically to the input INHIBIT.12.2.2.4 Blocking of the autorecloser M12391-103 v3Auto-Reclose attempts are expected to take place only for faults on the own line. The Auto-Recloser must be blocked by activating the INHIBIT input for the following conditions:• Tripping from Delayed Distance protection zones• Tripping from Back-up protection functions• Tripping from Breaker failure function• Intertrip received from remote end Breaker failure function• Busbar protection trippingDepending of the starting principle (General Trip or only Instantaneous trip) adopted abovethe delayed and back-up zones might not be required. Breaker failure trip local and remotemust however always be connected.12.2.2.5 Control of the auto-reclosing open time for shot 1 M12391-113 v4Up to four different time settings can be used for the first shot, and one extension time. Thereare separate settings for single-, two- and three-phase auto-reclosing open time,t1 1Ph, t12Ph, t1 3Ph. If no particular input signal is applied, and an auto-reclosing program with single-phase reclosing is selected, the auto-reclosing open timet1 1Ph will be used. If one of theinputs TR2P or TR3P is activated in connection with the start, the auto-reclosing open time fortwo-phase or three-phase reclosing is used. There is also a separate time setting facility forthree-phase high-speed auto-reclosing without Synchrocheck,t1 3PhHS, available for use whenrequired. It is activated by the STARTHS input.An auto-reclosing open time extension delay,tExtended t1, can be added to the normal shot 1delay. It is intended to come into use if the communication channel for permissive lineprotection is lost. In such a case there can be a significant time difference in fault clearance atthe two ends of the line. A longer “auto-reclosing open time” can then be useful. This extensiontime is controlled by setting parameterExtended t1=On and the input PLCLOST. If thisfunction is used the autorecloser start must also be allowed from distance protection Zone 2time delayed trip.Section 12 1MRK 505 363-UEN AControl220Application manual
