GE L30 Instruction Manual page 20

PILOT CHANNEL RELAYING
The slave L30 performs the following functions:
• Samples currents and voltages
• Removes DC offset from the current via the mimic algorithm
• Creates phaselets
• Calculates sum of squares data
• Transmits current data to all master L30 relays
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• Performs all local relaying functions
• Receives current differential DTT and Direct Input signals from all other L30 relays
• Transmits direct output signals to all communicating relays
• Sends synchronization information of local clock to all other L30 clocks
The master L30 relay performs the following functions:
• Performs all functions of a slave L30
• Receives current phasor information from all relays
• Performs the current differential algorithm
• Sends a current differential DTT signal to all L30 relays on the protected line
In the peer-to-peer mode, all L30 relays act as masters.
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CHAPTER 2: PRODUCT DESCRIPTION
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL