National standard of capacitors

How difficult is it to calibrate capacitors for use as standards?

Selection and calibration of capacitors for use as Standards is a challenging task, especially since the accuracies required, depening on the application, can be very demanding for the test gear as well as for the secondary- and working-standards used.

What is a series capacitor?

A series capacitor is a type of capacitor intended for high-voltage power systems and covered by this standard. The primary focus of the standard is on transmission applications and series capacitor units and banks.

What are the recommendations for the capacitor part?

The recommendations for the capacitor part are given in IEC 60143-1:2004. Specific information about protective equipment can be found in Clause 3 and 10.6. This second edition cancels and replaces the first edition published in 1994 and constitutes a technical revision.

What is a low-voltage dry-type alternating current (AC) power capacitor?

This document provides standard requirements and general guidelines for the design, performance, testing and application of low-voltage dry-type alternating current (AC) power capacitors rated 1,000V or lower, and for connection to low-voltage distribution systems operating at a nominal frequency of 50Hz or 60Hz.

What type of connector does a capacitor standard use?

The Capacitance Standards we build, in order to achieve high accuracy, are generally of coaxial (also called 'three terminal') type. That means that each of the two terminals of our Capacitance Standards is brought out through a BNC connector, with the shield of the two connectors forming the third terminal.

What is the rated voltage of a capacitor?

The rated voltage of a capacitor is limited to 10 000 V. (The operating frequency of the systems in which these capacitors are used is usually up to 15 kHz, while the pulse frequencies may be up to 5 to 10 times the operating frequency.)