Lenoir Elec provides excitation contactors for numerous power generation facilities, among which nuclear plants or hydroelectric dams.
- Switching on and off the excitation circuit of a machine, inserting a discharge resistor at the inductor terminals at the breaking time.
- The drawing below represents the static excitation circuit of an alternator.
- Contactor poles with magnetic blow-out: silver alloy contacts for calibres 80 to 7500A or copper contacts (on request).
- 1 or 2 magnetic blow-out rupturing poles with overlapping with the contactor poles.
- 1 mechanical latching with single or double electrical release.
- Magnetic circuit for over-excited coil supplied with DC current:
- closing: economy resistor for calibres 80 to 200A, delivered separately,
- opening: one NO contact, connected in series with the coil, opens at the same time as the contactor.
- Auxiliary contacts:
- range 80 to 200A: one M3 block type F1O2 – Y with one NC overlap contact inserting the resistor, one NO contact switching off the tripping coil and one NO contact, free for customer use,
- range 400 to 1000A: two D type blocks, that is 2NO+2NC contacts available and one M3 block type F1O2 – Y with one overlap NC contact inserting the resistor, one NO contact switching-off the tripping coil and one contact free for customer use,
- range 1250 to 7500A: one NC blow-out contact inserting the resistor, one M3 block type F1O2 – Z with one NO contact switching-off the tripping coil, 1NO+1NC contacts free for customer use.