| 摘要 |
<p>There is provided a method and apparatus for monitoring AC circuits, particularly for monitoring the condition of high voltage circuit breakers. High voltages are measured by connecting an external capacitor (17) between the secondary winding (13) of a current transformer (11) and ground (16), across the removable link (20). This connection, with the link (20) removed, produces a capacitor voltage divider (10) in which the high voltage element of the divider is the stray capacitance (14). The low voltage element of the divider is the external capacitor (17). The voltage on the load and supply side of a circuit breaker is measured using capacitor voltage dividers (10) and the voltage signals are fed to separate inputs on a multi-channel wave-form recording device.</p> |
