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I.L. 40-385.1B
1-10
(5/92)
Figure 1-5. MDAR Relay Program Functions
ESK00223 dtp
POWER
ON
-Initialization
-Self-Checks
Mode =
Background
START
Sample V and I
dc Offset
Correction
Compute V and I
Phasors Using
Fourier Algorithm
Mode?
Fault
Background
Disturbance
in
V or
Ι?
Mode =
Fault
Relaying Calculations:
Zone 1 and Pilot Zone
Pilot Logic and
Channel Control
No Fault for
3 Cycles ?
Mode =
Background
- Operator Panel
Interface
- Hardware Self-Checks
N
Y
N
Y
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
∆
•
•
∆
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Page 135: ...I L 40 385 1B SD 6 5 92 Figure SD 2 MDAR Block Diagram sheet 1 of 1 Sub 1 1611C12...