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I.L. 40-385.1B
-Initialization
POWER
-Self-Checks
ON
1-10
Mode =
Background
START
Sample V and I
dc Offset
Correction
Compute V and I
Phasors Using
Fourier Algorithm
Mode?
Background
Y
Disturbance
Ι?
∆
∆
in
V or
N
- Operator Panel
Interface
- Hardware Self-Checks
Figure 1-5. MDAR Relay Program Functions
Fault
Mode =
Fault
•
Relaying Calculations
- Zone 2
- Zone 3
- Out-of-Step Blinders
- Inst. Overcurrent
- Ground Backup
- Phase Selector
Checks and Logic
- Non-Pilot Trip Logic
- Loss-of-Pot. and Loss-of-Current
- Data Communications
- Contact Inputs
Relaying Calculations:
Zone 1 and Pilot Zone
Pilot Logic and
Channel Control
Mode =
Y
No Fault for
Background
3 Cycles ?
N
•
ESK00223 dtp
(5/92)
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