ABB REL301 - Page 21

I.L. 40-386.3
1-14 (10/94)
Figure 1-6 REL 301/302 Relay Program Functions
ESK00252 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:
Zone1 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
- Zone2
- Zone3
- 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
∆
•
•
∆
- Programmable Output Contact Update