Pilot Schemes - GE D60 Instruction Manual

CHAPTER 5: SETTINGS

5.8.14 Pilot schemes

SETTINGS  CONTROL ELEMENTS  PILOT SCHEMES
 PILOT SCHEMES

5.8.14.1 Direct under-reaching transfer trip (DUTT)
SETTINGS  CONTROL ELEMENTS  PILOT SCHEMES  DUTT SCHEME
 DUTT SCHEME

This scheme uses an under-reaching Zone 1 distance element to key a transfer trip signal(s) to the remote end(s), where on
receipt, the DUTT pilot scheme operates without additional protection supervision. For proper operation of the scheme, the
Zone 1 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 latter can be coded into one, two, or four bits over the
communications channel.
D60 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
 DUTT SCHEME


 PUTT SCHEME


 POTT SCHEME


 POTT1 SCHEME


 HYBRID POTT SCHEME


 BLOCKING SCHEME


 BLOCKING1 SCHEME


 DCUB SCHEME


DUTT SCHEME

FUNCTION: Disabled
DUTT SCHEME BLOCK:

Off
DUTT SEAL-IN

DELAY: 0.010 s
DUTT NO OF COMM

BITS: 1
DUTT RX1:

Off
DUTT RX2:

Off
DUTT RX3:

Off
DUTT RX4:

Off
DUTT SCHEME TARGET:

Self-Reset
DUTT SCHEME EVENT:

Disabled
See below
See page 5-373
See page 5-375
See page 5-378
See page 5-379
See page 5-383
See page 5-387
See page 5-388
Range: Disabled, Enabled
Range: FlexLogic operand
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
CONTROL ELEMENTS
5
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