Contents
1 Summary.............................................................................................................................................. 5
1.1 Scope of application.................................................................................................................. 5
1.2 Protection characteristics............................................................................................... 5
1.3 Protection configuration................................................................................................... 5
1.3.1 Protection function configuration......................................................................5
1.3.2 Measurement and control function........................................................................6
1.3.3 Communication function............................................................................................ 6
1.3.4 GPS timing function ................................................................................................. 7
1.3.5 Protection information function..........................................................................7
2 Technical parameter........................................................................................................................ 7
2.1 Environmental parameters................................................................................................... 7
2.2 Rated electrical parameters............................................................................................. 7
2.3 Main technical indicators................................................................................................. 8
3 Protection menu description........................................................................................................ 9
3.1 Protection on&off menu.......................................................................................................................9
3.2 Protection setting menu................................................................................................... 10
4 Protection Principle ................................................................................................................. 13
4.1 Judgment of motor startup and shutdown..................................................................... 13
4.2 Differential quick break................................................................................................. 14
4.3 Ratio differential............................................................................................................. 14
4.4 Differential current out of limit............................................................................... 15
4.5 CT disconnection........................................................ 16
4.6 Quick break ............................................................ 16
4.7 Time-limited quick break ............................................... 17
4.8 Overcurrent ............................................................ 17
4.9 Overcurrent inverse time limit ......................................... 18
4.10 Low voltage blocking over current protection .......................... 18
4.11 Overload .............................................................. 19
4.12 Locked-rotor protection ............................................... 20
4.13 Negative sequence overcurrent section I ............................... 20
4.14 Negative sequence overcurrent section II .............................. 20
4.15 Negative sequence overcurrent section II inverse time limit ........... 21
4.16 Zero sequence overcurrent ............................................. 21
4.17 Overheat protection alarm/trip ........................................ 22
4.18 Over frequency protection ............................................. 22
4.19 Low frequency load shedding ........................................... 23
4.20 Overvoltage ........................................................... 23
4.21 Low voltage ........................................................... 24
4.22 PT disconnection ...................................................... 24
4.23 PT voltage loss................................................................................................................ 25
4.24 System loses power.......................................................................................................... 25
4.25 Control loop disconnection.......................................................................................... 26
