Patent GB-190903046-A (GB)
Title: Improvements relating to Alternating Electric Current Distribution Systems.
Inventor: PECK JOHN SEDGWICK
IPC: H01F29/02
Filed: 1909-02-08
Granted: 1910-02-08
Abstract: 3046. Peck, J. S., Hansen, K. M. Faye-, and Lustgarten, S. Feb. 8. Systems depending on the use of static transformers.-In an auxiliary transformer arrangement for polyphase distribution systems, the windings of the auxiliary transformer are connected in series with the windings of the main transformer or in parallel with them, generally by means of a single contact. In the arrangement shown in Fig. 1, the connexion between the windings 4, 6 and 5, 7 are brought out to fixed contacts 10, 11, while the movable contact 9 is joined to the connexion between the windings 6, 7. In a modification, the connexion between the windings 6, 7 is brought out to a third fixed contact. In the parallel arrangement, the ends of the windings 4, 5 are connected to fixed contacts 10, 11, and the lead 2 is connected to the junction of the windings 6, 7 and to the movable contact 9 arranged to bridge the contacts 10, 11. In the three-wire two-phase system shown in Fig. 4, the transformer windings are T-connected, while the windings 6, 7 of the auxiliary transformer are arranged to be connected in series with the windings 4, 5 of the main transformer by means of the movable contact 9. Instead of the connexion between the windings 4, 6 being brought out to the movable contact 9, it may be brought out to a third fixed contact. In the parallel arrangement, the winding 7 is placed across the leads 1, 3, and the inside ends of the winding 5 are brought out to the fixed contacts 10, 11. The winding 4 is connected to the outer end of the winding 6 and to the movable contact 9. In the two-phase three-wire system shown in Fig. 7, the connexions between the windings 4, 6 and 5, 7 are brought out to fixed contacts 10, 11, and the lead 2 and the fixed contact 9 are connected to the junction of the windings 6, 7. In. the parallel arrangement, the winding 4 is placed between the lead 1 and contact 10, and the winding 5 is placed between the lead 3 and contact 11. The contact 9 is connected to the junction of the windings 6, 7 and lead 2. In the three-phase starconnected arrangement shown in Fig. 9, the connexions between the main and auxiliary transformer windings 4, 5, 13 and 6, 7, 14 are brought out to the contacts of the switch 8 ; or these connexions are brought out to three fixed contacts of the switch, the movable contact being connected to the neutral point of the transformer. This arrangement may also be employed in a four-wire three-phase system. In the parallel star-connected arrangement, the windings 6, 7, 14 of the auxiliary transformer are permanently connected between the leads 1, 2, 3, the winding 5 of the main transformer is connected between the lead 2 and the contact 10, the winding 13 is connected between the lead 3 and the contact 11, and the winding 4 is connected between the outer end of the winding 6 and the movable contact 9. In the three-phase delta-connected arrangement shown in Fig. 13, the windings 6, 7 are connected to contacts 10, 18 and 11, 19 respectively, the contacts being mounted upon the movable member 17 of the switch 8. In the delta -connected parallel arrangement, the junctions of the windings 4, 5 and 5, 13 are brought out to the fixed contacts 10, 11 respectively. In this arrangement, the auxiliary transformer may be provided with two windings V-connected ; the contacts 18, 19 may be fixed. In the Scott connexion shown in Fig. 17, the arrangement of the main and auxiliary transformer windings 4, 5, 6, 7 is similar to that shown in Fig. 4 ; andi n a modification, the auxiliary winding 6 is divided into two equal portions on each side of the main winding 4, the middle point of which is connected to one end of the auxiliary winding 7 in series with the main winding 5. Contacts are arranged to bridge the auxiliary transformer windings 6, 7. In the parallel arrangement of this connexion, one end of the winding 4 is connected to a movable contact adapted to bridge contacts connected to the middle portions of the winding 5.