Blocking Scheme Trip = Z1*T1 + Z2*T2 + Z3*T3 + Z4T4 + Z5*T5 + (Z1B * T1B * CR *TV) Cs = Z3 * TS NOTE: Z3 IS REVERSE ZONE CR CS Trip Transmission Time Communication Status Phase Z Simulation Checking Time Healthy Fail POWER SWING DETECTION Address No: 0120 : Enabled Setting Group A: 0020: Power Swing Address No: 2007: Trip Delay after Power Swing Blocking -- Sec. (Raise the Time Setting of Trip Delay after Power Swing Blocking Address No: 2007 to more than the longest time of the Distance Zones) Power Swing Operating Mode Address No:2002 Relay Action All zones Blocked No trip with Z1 , Z1B , Z2 Blocked Trip with No trip with Z1 , Z1B Blocked Trip with No trip with Z2 to Z5 Blocked Trip with When the Fault comes to the line, the Voltage will decrease or the Current increase, then the Impedance will decrease in very short time, then the relay will trip according to the setting of the fault case.
Blocking Scheme Trip = Z1*T1 + Z2*T2 + Z3*T3 + Z4T4 + Z5*T5 + (Z1B * T1B * CR *TV) Cs = Z3 * TS NOTE: Z3 IS REVERSE ZONE Phase Z Communication Status CR Simulation CS Checking Trip Time Transmission Time Healthy Fail POWER SWING DETECTION Address No: 0120 : Enabled Setting Group A: 0020: Power Swing Address No: 2007: Trip Delay after Power Swing Blocking -- Sec. (Raise the Time Setting of Trip Delay after Power Swing Blocking Address No: 2007 to more than the longest time of the Distance Zones) Power Swing Operating Mode Address No:2002 Relay Action All zones Blocked Z1 , Z1B , Z2 Blocked No trip with Trip with Z1 , Z1B Blocked No trip with Trip with Z2 to Z5 Blocked No trip with Trip with When the Fault comes to the line, the Voltage will decrease or the Current increase, then the Impedance will decrease in very short time, then the relay will trip according to the setting of the fault case.
7sa_line_distance_relay_test.docx