GE Multilin D60 Line Distance Protection System 5-2935 SETTINGS 5.7 CONTROL ELEMENTS5c) PERMISSIVE UNDER-REACHING TRANSFER TRIP (PUTT)PATH: SETTINGS CONTROL ELEMENTS PILOT SCHEMES PUTT SCHEMEThis scheme uses an under-reaching zone 1 distance element to key a transfer trip signal(s) to the remote terminal(s)where it is supervised by an over-reaching zone 2 distance element. For proper operation, the zone 1 and 2 phase andground distance elements must be enabled, configured, and set per rules of distance relaying.In single-pole tripping applications, the scheme uses local fault type identification provided by the phase selector togetherwith information received from the remote terminal(s). The scheme generates output operands (PUTT TX1 through PUTTTX4 ) that are used to transmit the signal to the remote end(s). Choices of communications channel include remote inputs/outputs and telecommunications interfaces. When used with telecommunications facilities the output operands should beassigned to operate output contacts connected to assert the individual bits at the interface.To make the scheme a fully operational stand-alone feature, the scheme output operands must be configured to interfacewith other relay functions, output contacts in particular. Typically, the output operands should be programmed to initiate atrip, breaker fail, and autoreclose, and drive a user-programmable LED as per user application. When used in conjunctionwith the Trip Output element, the scheme is pre-configured to initiate trip, breaker fail and single-pole autoreclose actions.• PUTT SCHEME BLOCK: This setting allows the user to assign any FlexLogic operand to block the scheme. Contactinputs from a pilot cut-out switch are typically used for this purpose.• PUTT RX PICKUP DELAY: This setting enables the relay to cope with spurious receive signals. This delay should beset longer than the longest spurious TX signal that can be received simultaneously with the zone 1 pickup. Theselected delay will increase the response time of the scheme.• PUTT SEAL-IN DELAY: The output FlexLogic operand ( PUTT OP) is produced according to the PUTT scheme logic. Aseal-in time delay is applied to this operand for coping with noisy communication channels such as a power line carrier.The PUTT SEAL-IN DELAY is a minimum guaranteed duration of the PUTT OP pulse. As this operand activates the triptable of the PUTT scheme, the trip operands PUTT TRIP A , B, C and 3P are sealed-in for the same period of time.• PUTT NO OF COMM BITS: This setting specifies the number of bits of the communications channel available for thescheme. The transmit codes and trip table of the PUTT scheme are identical as those for the direct under-reachingtransfer trip scheme. Please refer to Chapter 8: Theory of Operation for more information. PUTT SCHEMEPUTT SCHEMEFUNCTION: DisabledRange: Disabled, EnabledMESSAGE PUTT SCHEME BLOCK:OffRange: FlexLogic operandMESSAGE PUTT RX PICKUPDELAY: 0.000 sRange: 0.000 to 65.535 s in steps of 0.001MESSAGE PUTT SEAL-INDELAY: 0.010 sRange: 0.000 to 65.535 s in steps of 0.001MESSAGE PUTT NO OF COMMBITS: 1Range: 1, 2, or 4MESSAGE PUTT RX1:OffRange: FlexLogic operandMESSAGE PUTT RX2:OffRange: FlexLogic operandMESSAGE PUTT RX3:OffRange: FlexLogic operandMESSAGE PUTT RX4:OffRange: FlexLogic operandMESSAGE PUTT SCHEME TARGET:Self-ResetRange: Self-Reset, Latched, DisabledMESSAGE PUTT SCHEME EVENTS:DisabledRange: Disabled, Enabled
