Voltage transformer for a completely insulated high-voltage installation

Claim 2

In a fully-insulated, high-voltage installation including a grounded metal enclosure and a high-voltage conductor contained in the metal enclosure, a voltage transformer comprising: a supporting insulator centrally supporting the high-voltage conductor in the metal enclosure; a low-voltage electrode embedded in said supporting insulator so as to be in spaced relation to the high-voltage conductor, said low-voltage electrode and the high-voltage conductor conjointly defining a high-voltage capacitor; a low-voltage capacitor connected to said high-voltage capacitor, said high-voltage capacitor and said low-voltage capacitor conjointly defining a capacitive voltage divider; connecting means connecting said low-voltage capacitor to said low-voltage electrode embedded in said support insulator, said connecting means being a connecting lead extending within said supporting insulator; and, control electrode means embedded in said supporting insulator in surrounding relation to said connecting lead whereby a significant alteration of the pattern of the electric field lines within the metal enclosure is precluded.

Claim 3

The voltage transformer of claim 1, said control electrode means comprising a plurality of control electrodes embedded in said supporting insulator so as to be in surrounding relation to said connecting lead.

Claim 4

The voltage transformer of claim 2 wherein the high-voltage on the high-voltage conductor causes an electric field to be developed between the high-voltage conductor and the metal enclosure, each of said control electrodes being an open thin metal ring, said metal rings being disposed on respectively different equipotential planes of the electric field between the high-voltage conductor and the metal enclosure.

Claim 5

In a fully-insulated, high-voltage installation including a grounded metal enclosure and a high-voltage conductor contained in the metal enclosure, the high-voltage on the high-voltage conductor causing an electric field to be developed between the high-voltage conductor and the metal enclosure, a voltage transformer comprising: a supporting insulator centrally supporting the high-voltage conductor in the metal enclosure; a low-voltage electrode embedded in said supporting insulator so as to be in spaced relation to the high-voltage conductor, said low-voltage electrode and the high-voltage conductor conjointly defining a high-voltage capacitor; a low-voltage capacitor connected to said high-voltage capacitor, said high-voltage capacitor and said low-voltage capacitor conjointly defining a capacitive voltage divider; additional supporting insulators, and additional low-voltage electrodes in corresponding ones of said additional supporting insulators so as to be in spaced relation to the high-voltage conductor; said additional low-voltage electrodes and the high voltage conductor conjointly defining respective additional high-voltage capacitors; a plurality of connecting leads corresponding to respective ones of said low-voltage electrodes to connect the same to said low-voltage capacitor, said connecting leads being connected together whereby said high-voltage capacitors are connected in parallel with each other to provide a greater total high-voltage capacity for said capacitive voltage divider, said connecting leads being run in said supporting insulators respectively; and, control electrode means embedded in said supporting insulators, respectively, whereby a significant alteration of the pattern of the electric field lines within the metal enclosure is precluded.

Claim 6

In a fully-insulated, high-voltage installation including a grounded metal enclosure and a high-voltage conductor contained in the metal enclosure, the high-voltage on the high-voltage conductor causing an electric field to be developed between the high-voltage conductor and the metal enclosure, a voltage transformer comprising: a supporting insulator centrally supporting the high-voltage conductor in the metal enclosure; a low-voltage electrode embedded in said supporting insulator so as to be in spaced relation to the high-voltage conductor, said low-voltage electrode and the high-voltage conductor conjointly defining a high-voltage capacitor; a low-voltage capacitor connected to said high-voltage capacitor, said high-voltage capacitor and said low-voltage capacitor conjointly defining a capacitive voltage divider; additional supporting insulators, and additional low-voltage electrodes in corresponding ones of said additional supporting insulators so as to be in spaced relation to the high-voltage conductor; said additional low-voltage electrodes and the high voltage conductor conjointly defining respective additional high-voltage capacitors; a plurality of connecting leads corresponding to respective ones of said low-voltage electrodes to connect the same to said low-voltage capacitor, said connecting leads being connected together whereby said high-voltage capacitors are connected in parallel with each other to provide a greater total high-voltage capacity for said capacitive voltage divider, said connecting leads being run in said supporting insulators respectively; and, control electrode means embedded in said supporting insulators, respectively, whereby a significant alteration of the pattern of the electric field lines within the metal enclosure is precluded.

Claim 7

In a fully-insulated, high-voltage installation including a grounded metal enclosure and a high-voltage conductor contained in the metal enclosure, the high-voltage on the high-voltage conductor causing an electric field to be developed between the high-voltage conductor and the metal enclosure, a voltage transformer comprising: a supporting insulator centrally supporting the high-voltage conductor in the metal enclosure; a low-voltage electrode embedded in said supporting insulator so as to be in spaced relation to the high-voltage conductor, said low-voltage electrode and the high-voltage conductor conjointly defining a high-voltage capacitor; a low-voltage capacitor connected to said high-voltage capacitor, said high-voltage capacitor and said low-voltage capacitor conjointly defining a capacitive voltage divider; said supporting insulator having a surface engaging the high-voltage conductor, and a metal ring mounted at said surface for obtaining an advantageous distribution of the electric field.

Claim 8

In a fully-insulated, high-voltage installation including a grounded metal enclosure and a high-voltage conductor contained in the metal enclosure, the high-voltage on the high-voltage conductor causing an electric field to be developed between the high-voltage conductor and the metal enclosure, a voltage transformer comprising: a supporting insulator centrally supporting the high-voltage conductor in the metal enclosure; a low-voltage electrode embedded in said supporting insulator so as to be in spaced relation to the high-voltage conductor, said low-voltage electrode and the high-voltage conductor conjointly defining a high-voltage capacitor; a low-voltage capacitor connected to said high-voltage capacitor, said high-voltage capacitor and said low-voltage capacitor conjointly defining a capacitive voltage divider; said supporting insulator having a surface engaging the high-voltage conductor, and a metal ring mounted at said surface for obtaining an advantageous distribution of the electric field.