GE D60 Instruction Manual page 457

5 SETTINGS
c) PERMISSIVE UNDER-REACHING TRANSFER TRIP (PUTT)

PATH: SETTINGS CONTROL ELEMENTS
 PUTT SCHEME

MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
This 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 and
ground 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 together
with information received from the remote terminal(s). The scheme generates output operands (
) that are used to transmit the signal to the remote end(s). Choices of communications channel include remote inputs/
TX4
outputs and telecommunications interfaces. When used with telecommunications facilities the output operands should be
assigned 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 interface
with other relay functions, output contacts in particular. Typically, the output operands should be programmed to initiate a
trip, breaker fail, and autoreclose, and drive a user-programmable LED as per user application. When used in conjunction
with 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. Contact
inputs 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 be
set longer than the longest spurious TX signal that can be received simultaneously with the zone 1 pickup. The
selected delay will increase the response time of the scheme.
• PUTT SEAL-IN DELAY: The output FlexLogic operand (
seal-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
table of the PUTT scheme, the trip operands
• PUTT NO OF COMM BITS: This setting specifies the number of bits of the communications channel available for the
scheme. The transmit codes and trip table of the PUTT scheme are identical as those for the direct under-reaching
transfer trip scheme. Please refer to Chapter 8: Theory of Operation for more information.
GE Multilin

PILOT SCHEMES
PUTT SCHEME
FUNCTION: Disabled
PUTT SCHEME BLOCK:
Off
PUTT RX PICKUP
DELAY: 0.000 s
PUTT SEAL-IN
DELAY: 0.010 s
PUTT NO OF COMM
BITS: 1
PUTT RX1:
Off
PUTT RX2:
Off
PUTT RX3:
Off
PUTT RX4:
Off
PUTT SCHEME TARGET:
Self-Reset
PUTT SCHEME EVENTS:
Disabled
is a minimum guaranteed duration of the
PUTT TRIP A
D60 Line Distance Protection System

PUTT SCHEME
Range: Disabled, Enabled
Range: FlexLogic operand
Range: 0.000 to 65.535 s in steps of 0.001
Range: 0.000 to 65.535 s in steps of 0.001
Range: 1, 2, or 4
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: Self-Reset, Latched, Disabled
Range: Disabled, Enabled
) is produced according to the PUTT scheme logic. A
PUTT OP
pulse. As this operand activates the trip
PUTT OP
, , and are sealed-in for the same period of time.
B C 3P
5.7 CONTROL ELEMENTS
through
PUTT TX1 PUTT
5-323
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