GE L90 User Manual

5-376 L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CONTROL ELEMENTS CHAPTER 5: SETTINGS
5
5.8.12 Pilot schemes
5.8.12.1 Menu
SETTINGS  CONTROL ELEMENTS  PILOT SCHEMES
This menu is for selection and configuration of protection signaling schemes. All schemes are available for single-pole
tripping applications and can be used with one, two, or four-bit communications channels. Choices of communications
channel include Remote Inputs/Outputs and telecommunications interfaces.
For more information, see the Application of Settings chapter.
5.8.12.2 Direct under-reaching transfer trip (DUTT)
SETTINGS  CONTROL ELEMENTS  PILOT SCHEMES  DUTT SCHEME
 PILOT SCHEMES


 DUTT SCHEME

See below

 PUTT SCHEME

See page 5-378

 POTT SCHEME

See page 5-380

 POTT1 SCHEME

See page 5-383

 HYBRID POTT SCHEME

See page 5-384

 BLOCKING SCHEME

See page 5-388

 BLOCKING1 SCHEME

See page 5-392

 DCUB SCHEME

See page 5-393
 DUTT SCHEME


DUTT SCHEME
FUNCTION: Disabled
Range: Disabled, Enabled

DUTT SCHEME BLOCK:
Off
Range: FlexLogic operand

DUTT SEAL-IN
DELAY: 0.010 s
Range: 0.000 to 65.535 s in steps of 0.001

DUTT NO OF COMM
BITS: 1
Range: 1, 2, or 4

DUTT RX1:
Off
Range: FlexLogic operand

DUTT RX2:
Off
Range: FlexLogic operand

DUTT RX3:
Off
Range: FlexLogic operand

DUTT RX4:
Off
Range: FlexLogic operand

DUTT SCHEME TARGET:
Self-Reset
Range: Self-Reset, Latched, Disabled

DUTT SCHEME EVENT:
Disabled
Range: Disabled, Enabled

GE L90 Specifications

General

Brand	GE
Model	L90
Category	Relays
Language	English