Relay setting calculation|Restricted Earth Fault Protection relay Setting Part-2|KNEE POINT VOLTAGE 

PART-2
KNEE POINT VOLTAGE, RELAY PICK UP AND STABILIZING RESISTOR CALCULATION FOR REF RELAY SETTING
Two things I should rectify first.
1. By mistake I have said percentage impedance of 8.25 ohm, but percentage impedance is expressed in percentage only, and not by ohm. That has been an unconscious mistake.
2. The formula for calculating the fault current is not completely visible. It shall be (2500/(1.732*0.433*0.0825))
In this video we have explained calculation of knee point voltage, pick up, stabilizing resistor for restricted earth fault relay setting calculation. These calculations are required for successful implementation of Restricted Earth fault protection of alternator and Transformer.
Restricted Earth Fault Protection is also known as differential earth fault protection. It is basically earth fault protection but works on differential relay principle.
Restricted Earth Fault Protection is used to detect earth fault inside a machine in general.
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The explanation given in the video is applicable for all the below mentioned topic.
1. REF Relay setting
2. Restricted Earth Fault relay setting
3. Protection against internal earth fault
4. REF Relay setting calculation.
5. How to calculate settings for restricted earth fault relays
6. Restricted Earth Fault Protection philosophy of relay setting
2. How restricted Earth Fault Protection relay setting is done
3. REF relay setting principle
4. Differential earth fault Protection setting
5. Setting calculation of restricted Earth Fault Protection relay
6. REF relay setting
7. Restricted Earth Fault Protection CT selection
8. REF Protection of Alternator
9. REF protection of transformer
10. Knee point voltage calculation
11. stabilizing resistor calculation
12. high impedance restricted earth fault relay setting
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