Vlf sine 1 Hz – Universal voltage source for test- ing and diagnostics of medium-voltage cables
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9 2020 gt thi nghiem dien 1 tc ktd19md38 7318
| 7. Conclusion
The use of a VLF sine voltage source opens up the possibility of a single person performing cable tests and diagnostics of a cable route and with portable equipment. In scientific studies and in the field, the VLF sine showed that it is a suitable voltage source for cable testing, PD and tan delta measurement and that the achieved meas- urement results can be compared with re- sults of tests performed at operating fre- quency. In addition, the ideal, load- independent sine form proved to be of benefit when it pertains to the reproducibil- ity of results and when load-independence is desired (independence from measure- ment of cable lengths). Thus, comparisons of measurement results can be performed easily and more experience on condition evaluation of cable routes can continue to be acquired. Thus, the VLF sine measurement offers the opportunity to measure more cable routes by using the same means and time and to collect more information on the network condition. This comes with various ad- vantages: • Specific allocation of maintenance budget • Cost savings by isolating faulty partial sections • Lower failure rate • Positive effect on the cost structure in ratio to the network failure rate • Quality of new cable routes (detection of installation faults before any actual failure) Against this background, the discussion about the comparability of the VLF sine measurement results with other voltage shapes acquires academic importance. The universality of VLF sine measurement has proven its suitability in various net- works (Europe, overseas, on plastic- insulated cables, paper pulp insulated ca- bles, mixed routes…) and delivers ample and precise results, thus enabling the net- work and maintenance engineer to make a reliable evaluation of the cable routes. tải về 225.12 Kb. Chia sẻ với bạn bè của bạn:
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