Patent ID: 8330302

Claim:
A circuit arrangement (A) or igniting four thin silicon rods ( 81 to 84 ) in a reactor for producing a number of four silicon rods from the thin silicon rods ( 81 to 84 ) according to the Siemens process and for starting up the reactor, comprising a first terminal, a second terminal and a third terminal for connection to a three-phase mains, two outer terminals (Z 1 , Z 6 ) and at least three inner terminals (Z 2 , Z 3 /Z 4 , Z 5 ) for connecting the thin silicon rods ( 81 to 84 ), two outer transformers (T 1 , T 4 ) and two inner transformers (T 2 , T 3 ), each having a primary winding and a secondary winding, two outer power controllers (A 100 , A 400 ) configured for controlling a current through the primary windings of the outer transformers, two inner power controllers (A 200 , A 300 ) configured for controlling the current through the primary windings of the inner transformers, one or more control means for controlling the power controllers (A 100 , A 200 , A 300 , A 400 ), wherein the primary windings of the outer transformers (T 1 , T 4 ) are connected in parallel and the parallel connection being connected with the first terminal (L 1 ) and with the second terminal (L 2 ) for connection to the three-phase mains, wherein the primary windings of the inner transformers (T 2 , T 3 ) are connected in parallel and this parallel connection is connected, on one hand, with the second terminal (L 2 ) and, on the other hand, with the third terminal (L 3 ) for connection to the three-phase mains, wherein a first tap (T 1 . 2 . 1 ) of the secondary winding of the first (T 1 ) of the two outer transformers (T 1 , T 4 ) is connected to a first of the two outer terminals (Z 1 ), and a second tap (T 1 . 2 . 2 ) of the secondary winding of the first outer transformer (T 1 ) is connected to a first tap (T 2 . 2 . 1 ) of the secondary winding of the first transformer (T 2 ) of the two inner transformers (T 2 , T 3 ) and with a first terminal (Z 2 ) of the three inner terminals (Z 2 , Z 3 /Z 4 , Z 5 ), a second tap (T 2 . 2 . 2 ) of the secondary winding of the first inner transformer (T 2 ) is connected to a first tap (T 3 . 2 . 1 ) of the secondary winding of the second transformer (T 3 ) of the two inner transformers (T 2 , T 3 ) and with a second terminal (Z 3 / 4 ) of the three inner terminals (Z 2 , Z 3 /Z 4 , Z 5 ), a second tap (T 3 . 2 . 2 ) of the secondary winding of the second inner transformer (T 3 ) is connected to a first tap (T 4 . 2 . 1 ) of the secondary winding of a second transformer (T 4 ) of the two outer transformers (T 1 , T 4 ) and with a third terminal (Z 4 ) of the three inner terminals (Z 2 , Z 3 /Z 4 , Z 5 ), wherein a second tap (T 4 . 2 . 2 ) of the secondary winding of the second outer transformer (T 4 ) is connected to a second terminal (Z 6 ) of the two outer terminals (Z 1 , Z 6 ), and wherein the two outer terminals (Z 1 , Z 6 ) are connected to one another and to ground by way of switching means ( 31 , 32 ).