7SR210 & 7SR220 Commissioning & Maintenance Guide
© 2013 Siemens Protection Devices Limited Page 75 of 82
3.5.1 DETERMINING LOAD BLINDER REGIONS (21LB)
Test Procedure (Using Omicron Relay Test Set)
1. Set-up the relay with default or appropriate parameter settings.
2. Set-up Omicron current and voltage settings e.g. 63.5 V and 0.5 A three-phase.
3. Select all three currents and set an appropriate initial angle for rotation on the Omicron.
4. Apply Omicron current and voltage to the relay.
5. Using the PC mouse click the appropriate arrow ‘ ’ to rotate the angle of current in the anti-clockwise
(positive degree) direction.
6. View the LEDs for indication of Load Blinder operation as the angle moves out-of or into the Load Blinder
region.
7. Rotating the angle in an anti-clockwise direction will see the LEDs extinguish, this indicates the drop-off
point of the Load Blinder region. Record the angle as Point1 in the table of values.
8. Rotating the angle from this point in a clockwise direction will see the LEDs illuminate which indicates the
pick-up point of the Load Blinder region. Record the angle as Point 2 in the table of values.
9. Continue this process to find the other boundaries. See Error! Reference source not found. below.
Angle data points (b and c) Default Settings
region
Angle limits (b and c). Typical values.
region
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