Siemens 7SA511 사용자 설명서
7SA511 Line Protection Relay
Reference A
July 27, 1995
A-1
Method of Operation
Table of Contents
A. Method of Operation .......................................................................................................... A-5
A.1 Overview of Hardware and Protection Functions.......................................................... A-5
A.2 Distance Protection Overview....................................................................................... A-7
A.2 Distance Protection Overview....................................................................................... A-7
A.2.1 Ground Fault Detection and Processing ................................................................. A-8
A.2.2 Overcurrent Fault Detection................................................................................... A-9
A.2.3 Polygonal Impedance Fault Detection (Optional) ................................................. A-10
A.2.4 Voltage Controlled Overcurrent Fault Detection (Optional) ................................. A-12
A.2.2 Overcurrent Fault Detection................................................................................... A-9
A.2.3 Polygonal Impedance Fault Detection (Optional) ................................................. A-10
A.2.4 Voltage Controlled Overcurrent Fault Detection (Optional) ................................. A-12
A.3 Determination of the Faulted Loops............................................................................ A-15
A.3.1 Verification of the Faulted Loop(s) ...................................................................... A-15
A.3.2 Fault Loop Determination in Grounded Systems .................................................. A-17
A.3.3 Fault Loop Determination in Ungrounded Systems (Optional).............................. A-19
A.3.2 Fault Loop Determination in Grounded Systems .................................................. A-17
A.3.3 Fault Loop Determination in Ungrounded Systems (Optional).............................. A-19
A.4 Fault Impedance Calculation....................................................................................... A-24
A.4.1 Impedance Calculation on the Protected Line....................................................... A-24
A.4.2 Correction for Parallel Lines (Optional)................................................................ A-26
A.4.2 Correction for Parallel Lines (Optional)................................................................ A-26
A.5 Directional Determination........................................................................................... A-27
A.5.1 Directional Characteristics ................................................................................... A-27
A.5.2 Directional Characteristics without Load.............................................................. A-28
A.5.3 Directional Characteristics with Load................................................................... A-30
A.5.2 Directional Characteristics without Load.............................................................. A-28
A.5.3 Directional Characteristics with Load................................................................... A-30
A.6 Tripping Characteristics and Logic.............................................................................. A-32
A.6.1 Tripping Characteristics ....................................................................................... A-32
A.6.2 Tripping Logic..................................................................................................... A-33
A.6.2 Tripping Logic..................................................................................................... A-33
A.7 Switch-Onto-Fault Protection ..................................................................................... A-36
A.8 Emergency Overcurrent Protection............................................................................. A-36
A.9 Power Swing Function................................................................................................ A-37
A.8 Emergency Overcurrent Protection............................................................................. A-36
A.9 Power Swing Function................................................................................................ A-37
A.9.1 Detection of Power Swings.................................................................................. A-38
A.9.2 Power Swing Blocking......................................................................................... A-40
A.9.3 Power Swing (Out-of-Step) Trip.......................................................................... A-40
A.9.2 Power Swing Blocking......................................................................................... A-40
A.9.3 Power Swing (Out-of-Step) Trip.......................................................................... A-40
A.10 Pilot Protection......................................................................................................... A-41
A.10.1 Permissive Underreach Transfer Trip With Fault Detection................................ A-45
A.10.2 Permissive Underreach Transfer Trip With Zone Z1B ........................................ A-46
A.10.3 Permissive Overreach Transfer Trip With Zone Z1B.......................................... A-47
A.10.4 Permissive Overreach Transfer Trip With Fault Detection Zone ......................... A-48
A.10.5 Permissive Overreach Transfer Trip Unblock Scheme with Zone Z1B................ A-50
A.10.6 Permissive Overreach Transfer Trip Unblock Scheme With Fault Detection....... A-53
A.10.7 Blocking Scheme With Zone Z1B ...................................................................... A-54
A.10.8 Z1B Blocking via Pilot Wires............................................................................. A-56
A.10.9 Reverse Interlocking .......................................................................................... A-58
A.10.10 Echo Keying Function (Weak-Feed Compensation).......................................... A-59
A.10.11 Transient Blocking........................................................................................... A-60
A.10.2 Permissive Underreach Transfer Trip With Zone Z1B ........................................ A-46
A.10.3 Permissive Overreach Transfer Trip With Zone Z1B.......................................... A-47
A.10.4 Permissive Overreach Transfer Trip With Fault Detection Zone ......................... A-48
A.10.5 Permissive Overreach Transfer Trip Unblock Scheme with Zone Z1B................ A-50
A.10.6 Permissive Overreach Transfer Trip Unblock Scheme With Fault Detection....... A-53
A.10.7 Blocking Scheme With Zone Z1B ...................................................................... A-54
A.10.8 Z1B Blocking via Pilot Wires............................................................................. A-56
A.10.9 Reverse Interlocking .......................................................................................... A-58
A.10.10 Echo Keying Function (Weak-Feed Compensation).......................................... A-59
A.10.11 Transient Blocking........................................................................................... A-60
A.11 Isolated Ground Fault Detection (Optional) .............................................................. A-61
A.11.1 Fault Detection .................................................................................................. A-61