Specifications

7SR242 Duobias Performance Specification
©2010 Siemens Protection Devices Limited Chapter 3 - Page 3 of 45
2.4.5 Operate and Reset Level (46IT) ................................................................................19
2.4.6 Operate and Reset Time (46IT) .................................................................................20
2.5 49 Thermal Overload ..............................................................................................................21
2.5.1 Reference...................................................................................................................21
2.5.2 Operate and Reset Level ...........................................................................................21
2.5.3 Operate and Reset Time............................................................................................21
2.6 50 instantaneous overcurrent .................................................................................................23
2.6.1 Reference...................................................................................................................23
2.6.2 Operate and Reset Level ...........................................................................................23
2.6.3 Operate and Reset Time............................................................................................23
2.7 50N instantaneous Derived Earth Fault..................................................................................24
2.7.1 Reference...................................................................................................................24
2.7.2 Operate and Reset Level ...........................................................................................24
2.7.3 Operate and Reset Time............................................................................................24
2.8 50G Instantaneous Measured Earth Fault..............................................................................25
2.8.1 Reference...................................................................................................................25
2.8.2 Operate and Reset Level ...........................................................................................25
2.8.3 Operate and Reset Time............................................................................................25
2.9 51 Time Delayed Overcurrent.................................................................................................26
2.9.1 Reference...................................................................................................................26
2.9.2 Operate and Reset Level ...........................................................................................26
2.9.3 Operate and Reset Time............................................................................................27
2.10 51N Time Delayed Derived Earth Fault..................................................................................28
2.10.1 Reference...................................................................................................................28
2.10.2 Operate and Reset Level ...........................................................................................28
2.10.3 Operate and Reset Time............................................................................................29
2.11 51G Time Delayed Measured Earth Fault ..............................................................................30
2.11.1 Reference...................................................................................................................30
2.11.2 Operate and Reset Level ...........................................................................................30
2.11.3 Operate and Reset Time............................................................................................31
2.12 59N Neutral Voltage Displacement.........................................................................................35
2.12.1 Reference (59NDT)....................................................................................................35
2.12.2 Operate and Reset Level (59NDT) ............................................................................35
2.12.3 Operate and Reset Time (59NDT).............................................................................35
2.12.4 Reference (59NIT) .....................................................................................................35
2.12.5 Operate and Reset Level (59NIT)..............................................................................35
2.12.6 Operate and Reset Time (59NIT) ..............................................................................36
2.13 64H Restricted Earth Fault Protection ....................................................................................37
2.13.1 Reference...................................................................................................................37
2.13.2 Operate and Reset Level ...........................................................................................37
2.13.3 Operate and Reset Time............................................................................................37
2.14 81Under/Over Frequency .......................................................................................................38
2.14.1 Reference...................................................................................................................38
2.14.2 Operate and Reset Level ...........................................................................................38
2.14.3 Operate and Reset Time............................................................................................38
2.15 87 Biased Differential..............................................................................................................39
2.15.1 Reference...................................................................................................................39
2.15.2 Operate Time .............................................................................................................40
2.16 87HS High-Set Differential......................................................................................................41
2.16.1 Reference...................................................................................................................41
2.16.2 Operate and Reset Level ...........................................................................................41
2.16.3 Operate and Reset Time............................................................................................41
Section 3: Supervision Functions ......................................................................................................42
3.1 50BF Circuit Breaker Fail........................................................................................................42
3.1.1 Reference...................................................................................................................42
3.1.2 Operate and Reset Level ...........................................................................................42
3.1.3 Operate and Reset Time............................................................................................42