Siemens 7SR242 Duobias - Page 3

7SR242 Duobias Commissioning & Maintenance Guide
©2010 Siemens Protection Devices Limited Chapter 6 Page 3 of 57
2.11 Under/Over Frequency (81) ....................................................................................................43
2.12 Overfluxing (24) ......................................................................................................................45
2.12.1 definite time (24DT)....................................................................................................45
2.12.2 inverse time (24IT) .....................................................................................................46
Section 3: Supervision Functions ......................................................................................................47
3.1 CB Fail (50BF) ........................................................................................................................47
3.2 Trip/Close Circuit Supervision (74TCS, 74CCS) ..................................................................49
3.3 Magnetising Inrush Detector (81HBL2) ................................................................................50
3.4 Overfluxing Detector (81HBL5).............................................................................................52
Section 4: Control & Logic Functions................................................................................................53
4.1 Quick Logic .............................................................................................................................53
Section 5: Testing and Maintenance..................................................................................................54
5.1 Periodic Tests .........................................................................................................................54
5.2 Maintenance............................................................................................................................54
5.3 Troubleshooting ......................................................................................................................54
5.4 Defect Report Form ................................................................................................................56