GE L30 User Manual

GE Multilin L30 Line Current Differential System 2-23
2 PRODUCT DESCRIPTION 2.4 PILOT CHANNEL RELAYING
2
2.4.3 LOOPBACK TEST
This option allows the user to test the relay at one terminal of the line by looping the transmitter output to the receiver input;
at the same time, the signal sent to the remote will not change. A local loopback feature is included in the relay to simplify
single ended testing.
2.4.4 DIRECT TRANSFER TRIPPING
The L30 includes provision for sending and receiving a single-pole direct transfer trip (DTT) signal from current differential
protection between the L30 relays at the line terminals using the pilot communications channel. The user may also initiate
an additional eight pilot signals with an L30 communications channel to create trip, block, or signaling logic. A FlexLogic
operand, an external contact closure, or a signal over the LAN communication channels can be assigned for that logic.

GE L30 Specifications

General

Brand	GE
Model	L30
Category	Relays
Language	English