Zero-sequence current suppressor

Details Zero-sequence current suppressor Zero-sequence current suppressor

H - Electricity

02

J

H02J 3/01 (2006.01) H02H 3/16 (2006.01) H02H 7/04 (2006.01)

Patent

CA 2157307

Harmonics due to single-phase non-linear loads, together with normal load unbalances, can produce overloads and burnouts of grounded-neutral source transformers and their neutral connec- tions. A system is disclosed which will avoid or greatly amel- iorate such problems through the application of a zig-zag trans- former 5 together with unique system re-connections N, 2d, 2e, 5e. Said system is comprised of a zig-zag transformer 5 having phase windings 5a, 5b, 5c connected in shunt across the electrical load devices 3a, 3b, 3c, and with neutral terminal connected to ground and to the neutral terminal 3d of said electrical load devices. The system ground is moved from the neutral terminal 2c of said source transformer to the neutral terminal 5d of said zig-zag transformer. The original ground point may be retained by dis- connecting the ground connection 2d and the neutral conductor N from said source transformer neutral terminal 2c and connecting them together at a junction point 2e. Image

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