Voltage sensor

An electrical switch device comprising at least one voltage sensor, said electrical switch device having a voltage terminal comprising an electrical conductor, said at least one voltage sensor comprising:

• a voltage input;
• a voltage output;
• a voltage reference;
• a first circuit portion connected between said voltage input and said voltage output, said first circuit portion comprising at least one impedance component providing a first impedance that is temperature dependent;
• and
• a second circuit portion connected between said voltage output and said voltage reference, said second circuit portion comprising at least one impedance component providing a second impedance that is temperature dependent,
• wherein said first and second circuit portions are configured such that the temperature dependence of said second impedance matches the temperature dependence of said first impedance at least within an operating temperature range,
• and wherein said at least one impedance component of said second circuit portion and said at least one impedance component of said first circuit portion are located in one or more location that is subject to, in use, substantially the same temperature, and
• wherein said at least one impedance component of said first circuit portion comprises a first impedance component having a body that is shaped and dimensioned for mounting on said electrical conductor of said voltage terminal, said first impedance component being mounted on said electrical conductor such that an inner surface of said body contacts said electrical conductor to provide said voltage input, and wherein an outer surface of said body is connected to said voltage output, and
• wherein said at least one impedance component of said second circuit portion is located adjacent said at least one impedance component of said first circuit portion, and
• wherein said at least one impedance component of said second circuit portion is mounted on said voltage terminal, or on said at least one impedance component of said first circuit portion, or on a part of said switch device that is located adjacent said voltage terminal, or on a support structure that also supports said at least one impedance component of said first circuit portion.

A voltage sensor comprising:

• a voltage input;
• a voltage output;
• a voltage reference;
• a first circuit portion connected between said voltage input and said voltage output, said first circuit portion comprising at least one impedance component providing a first impedance that is temperature dependent;
• and
• a second circuit portion connected between said voltage output and said voltage reference, said second circuit portion comprising at least one impedance component providing a second impedance that is temperature dependent,
• wherein said first and second circuit portions are configured such that the temperature dependence of said second impedance matches the temperature dependence of said first impedance at least within an operating temperature range, and
• wherein said at least one impedance component of said second circuit portion and said at least one impedance component of said first circuit portion are located in one or more location that is subject to, in use, substantially the same temperature, and
• wherein said at least one impedance component of said first circuit portion comprises a capacitor that is sleeve-like in shape and is mountable on an electrical conductor such that an inner surface of said capacitor contacts said electrical conductor, said inner surface serving as a first terminal of the capacitor and providing said voltage input, said capacitor having an outer surface serving as a second terminal of the capacitor and being electrically connected to said voltage output.