Medium voltage switchgear application guide
Medium voltage switchgear application guide
Medium voltage switchgear application guide
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
<strong>Medium</strong> <strong>voltage</strong> <strong>switchgear</strong> <strong>application</strong> <strong>guide</strong><br />
Appendix 6: alternating<br />
current melting arc<br />
furnaces(cont’d)<br />
3 - ELECTRICAL POWER SUPPLY<br />
The transformer) power supply or on must the factory be channelled distribution from network. the HV (with step-down<br />
The from power 15 to 40 available kV. varies from 10 to 100 MVA with <strong>voltage</strong> values ranging<br />
arc furnace power supply<br />
on the internal factory network<br />
MV (15 to 40 kV)<br />
4<br />
MV/LV<br />
1 2 3 1<br />
1 = disconnector<br />
2 = circuit breaker<br />
3 = switch<br />
4 = arrester<br />
5 = over<strong>voltage</strong> limiting capacitors<br />
6 = earth switch<br />
5 6<br />
furnace<br />
10 to 100 MVA<br />
The furnace switch controls all devices downstream of the transformer.<br />
For ≈8 operations an average per of 13 cast. casts per day the <strong>switchgear</strong> carries out:<br />
≈100 ≈30,000 operations operations per per day. year.<br />
<strong>voltage</strong> The furnace (15 to transformer, 40 kV) to pass located to the next low to <strong>voltage</strong> the furnace, used by allows the furnace intermediate<br />
1000 V).<br />
≈800 to<br />
date<br />
11/94<br />
- B•3•2 -<br />
revised<br />
05/2004<br />
page 12
Change language