Calculate Operation Area for SEL Directional

SEL Directional Element Calculator For SEL-351A Directional Element 

Relay Setting 30 Ω Z2F= -100 Ω Z2R= 80 Z1ANG= 100 Ω Z0F= -100 Ω Z0R= 45 Z0ANG= °

°

Test Voltage and Current 63.5 < 0 VA= 63.5 < -120 VB= 30 < 120 VC= 0.2 < 0 IA= ° ° ° °

IB= IC=

0.2 <

-120

°

0 <

120

°

V V V A A A

Negative Sequence Q Element Boundry Search Forward  63.5 < 180 VA= V 2.12 < 100 A IA= Reverse 63.5 < 180 VA= V -0.64 < 100 A IA= ° °

° °

Zero Sequence V0 Element Boundry Search Forward  VA= 63.5 < 180 0.64 < 135 IA= Reverse VA= 63.5 < 180 -0.64 < 135 IA=

° °

A

°

V A

°

Summary of Direction Balance Fault P Unbalance Fault Q Earth Fault QG Earth Fault VG -

REV Unbalanced REV REV REV

SEL Balance Phase Directional Element Calculator (P) Developed by: TCM on 30/5/2012 !!! NOTE: WILL ONLY WORK WITH BALANCED V AND I Step 1 Relay Setting 80 Z1ANG= °

Step 2

Test Voltage and Current 63.5 < 0 VA= 63.5 < -120 VB= 30 < 120 VC= 0.2 < 0 IA= 0.2 < -120 IB= 0 < 120 IC= ° ° ° ° ° °

Step 3

Determine Direction I Fwd REV  I Rev

V V V A A A

Boundry Operating Area 170