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Page 93

| Figure 6-4 Step-type voltage regulator. |

| switches, numbered 1 through 9, are never used to make or break the circuit; generally, they are installed in the same enclosure as the transformer itself. The transfer switches, lettered A, B, and C, serve to make and break the circuit under oil and are installed in a separate compartment, so that they may be maintained, and the oil changed when it becomes contaminated from the switching arcs which may occur. The preventive autotransformer is connected as shown, and its midpoint connected to the main portion of the primary winding. |

| Figure 6-5 Top changing under load step-type voltage regulator (TCUL Transformer). |

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