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POWER
ON
MODE =
FAULT
FAULT
SETUP
– OPERATOR INTERFACE
– SELF-CHECK
RELAYING CALCULATIONS:
– Phase Selection
– Direction
– Zone 2
– Zone 3
– Out-of-Step
– Inst. Overcurrent
– Ground Backup
LOGIC
– Loss of Potential
– Loss of Current
– Contact Inputs
– Single-Pole-Trip
– Trip Logic
– Reclosing
Data Bank
Control
– iNITIALIZATION
– SELF-CHECKS
YES
BACKGROUND
Figure 1-5 REL300 Relay Program Functions
MODE =
FAULT
SAMPLE V and I
COMPUTE FOURIER
& SUM-OF-SQUARES
DISTURBANCE
∆V or ∆I?
NO
MODE?
RELAYING CALCULATIONS
– Phase Selection
– Direction
– Zone 1
– Pilot
– Zone 2
– Zone 3
– Out-of-Step
– Inst. Overcurrent
– Ground Backup
LOGIC
– Loss of Potential
– Loss of Current
– Contact Inputs
– Pilot Logic
– Channel Control
– Single-Pilot-trip
– Trip Logic
– Reclosing
– Data Communications
– Target Data Collection
I.L. 40-385.7
FAULT
NO Zone 1
Yes
or Pilot Fault &
V & I Stable?
No
MODE =
Background
1-13
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