Voltage measuring device for encapsulated high-voltage installations

A voltage measuring device for use with an encapsulated, high-voltage switching installation including an inner conductor within a grounded metallic outer tube wherein an electric field exists between said inner conductor and said outer tube which comprises:

• a. means for widening said outer tube to thereby form a space for locating at least one of the following elements of said measuring device;
• b. a Pockels cell positioned, approximately, at a distance from said inner conductor equal to the distance said outer tube is located from said inner conductor, said Pockels cell positioned such that said electric field passes through said cell;
• c. a source of polarized light, said polarized light directed towards said Pockels cell and passing therethrough;
• d. a metal layer covering said Pockels cell on the side facing away from said inner conductor, said metal layer electrically connected to said outer tube;
• and
• e. an optical evaluation device for monitoring the polarized light exiting from said instrument, said evaluation device producing an indication proportional to the amount of shift of the plane of polarization of said light, the amount of said shifting being proportional to the intensity of said electric field.

A voltage measuring device for use with an encapsulated, high-voltage switching installation including an inner conductor within a grounded metallic outer tube wherein an electric field exists between said inner conductor and said outer tube which comprises:

• means for widening said outer tube to thereby form a space for locating at least one of the following elements of said measuring device;
• an electro-optical component positioned, approximately, at a distance from said inner conductor equal to the distance said outer tube is located from said inner conductor, said component positioned such that said electric field passes through said component;
• a source of polarized light, said polarized light directed towards said electro-optical component and passing therethrough;
• a metal layer covering said electro-optical component on the side facing away from said inner conductor, said metal layer electrically connected to said outer tube;
• and, an optical evaluation device for monitoring the polarized light exiting from said instrument, said evaluation device producing an indication proportional to the amount of shift of the plane of polarization of said light, the amount of said shifting being proportional to the intensity of said electric field, said electro-optical component, said source of polarized light and said optical evaluation device all being positioned within said space formed by said widening means.

A voltage measuring device for use with an encapsulated, high-voltage switching installation including an inner conductor within a grounded metallic outer tube wherein an electric field exists between said inner conductor and said outer tube which comprises:

• means for widening said outer tube to thereby form a space for locating at least one of the following elements of said measuring device;
• an electro-optical component positioned, approximately, at a distance from said inner conductor equal to the distance said outer tube is located from said inner conductor, said component positioned such that said electric field passes through said component;
• a source of polarized light, said polarized light directed towards said electro-optical component and passing therethrough;
• a metal layer covering said electro-optical component on the side facing away from said inner conductor, said metal layer electrically connected to said outer tube;
• and, an optical evaluation device for monitoring the polarized light exiting from said instrument, said evaluation device producing an indication proportional to the amount of shift of the plane of polarization of said light, the amount of said shifting being proportional to the intensity of said electric field, said widening means including a metallic stub positioned in said outer tube and a metal flange, connected to said stub, to thereby seal said space from the outside.