Siemens 7SG12 DAD-N - Table of Contents

7SG12 DAD N Commissioning
Contents
1.
Introduction ........................................................................................................................................................ 3
2. Safety.................................................................................................................................................................3
3. Sequence of Tests .............................................................................................................................................3
4. Test Equipment Required...................................................................................................................................3
5. Insulation Resistance Test .................................................................................................................................4
6. Check of C.T and Secondary Wiring Resistance ............................................................................................... 4
7. Power Supply.....................................................................................................................................................5
8. Programming the Relay......................................................................................................................................5
8.1 Setting by laptop ......................................................................................................................................5
8.2 Setting via relay fascia ............................................................................................................................. 6
9. Secondary Injection Tests..................................................................................................................................6
9.1 Accuracy of Measurement .......................................................................................................................6
9.2 Checking the Differential Element............................................................................................................6
10. Primary Injection Tests.......................................................................................................................................7
11. Fault Setting Tests .............................................................................................................................................7
11.1 Differential protections .........................................................................................................................7
12. Tripping and Intertripping Tests.......................................................................................................................... 7
13. Tests Using Load Currents.................................................................................................................................7
14. Putting into Service ............................................................................................................................................8
List of Tables
Table 1 - Insulation Resistance Values....................................................................................................................4
Table 2 – Lead Resistance Values ..........................................................................................................................5
Table 3 – Accuracy of Measurement .......................................................................................................................6
Table 4 – Differential Element PU/DO ..................................................................................................................... 7
Table 5 – Primary Injection Test Results ................................................................................................................. 7
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