High-voltage instrument transformers

Claim 1

IMPROVEMENTS IN A HIGH-VOLTAGE TRANSFORMER WHICH INCLUDES A TUBULAR INSULATOR CONTAING THE TRANSFORMER WINDINGS AND A FLUID INSULATING MEDIUM AND WHEREIN SAID TUBULAR INSULATOR HAS AT LEAST ONE OPEN END, SAID IMPROVEMENTS COMPRISING A HOLLOW HEAD CHAMBER CONNECTED TO SAID TUBULAR INSULATOR ABOUT SAID OPEN END, A HINGED WINDOW IN THE WALL OF SAID HEAD CHAMBER, A TUBULAR BODY DISPOSED IN SAID HEAD CHAMBER, SAID TUBULAR BODY INCLUDING FIRST AND SECOND FLANGED ENDS AND A PLANE WALL PORTION INTERMEDIATE SAID FLANGED ENDS AND DISPOSED OPPOSITE SAID WINDOW, AN EXPANSION VESSEL IN SAID HEAD CHAMBER, MEANS FOR SEALABLY CONNECTING SAID EXPANSION VESSEL TO THE FIRST FLANGED END OF SAID TUBULAR BODY, MEANS FOR SEALABLY CONNECTING THE OPEN END OF SAID TUBULAR INSULATOR TO THE SECOND FLANGED END OF SAID TUBULAR BODY, THE CROSSSECTIONAL AREA OF SAID TUBULAR BODY BEING SUFFICIENTLY LARGE WHEREBY AN UNCONSTRAINED FLUID PATH IS ESTABLISHED BETWEEN SAID EXPANSION VESSELS AND SAID TUBULAR INSULATOR TO PROVIDE MOMENTARY PRESSURE EQUALIZATION THEREBETWEEN IN THE EVENT OF SUDDEN RISES IN PRESSURE, A PLURALITY OF THREADED FEEDTHROUGHS DISPOSED IN AND PASSING THROUGH THE PLANE PORTION OF SAID TUBULAR BODY, WHEREBY A FIRST PORTION OF EACH FEEDTHROUGH IS WITHIN SAID TUBULAR BODY AND A SECOND PORTION IS EXTERNAL TO SAID TUBULAR BODY AND OPPOSITE SAID WINDOW, MEANS FOR CONNECTING SAID FIRST PORTIONS TO SAID TRANSFORMER WINDINGS AND MEANS FOR SELECTIVELY CONNECTING SAID SECOND PORTIONS IN ACCORDANCE WITH GIVEN TRANSFORMER RATIOS.