Measuring system for continuously monitoring a high-voltage bushing
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United States of America Patent
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Jan 31, 2017
Grant Date -
Dec 10, 2015
app pub date -
Jan 14, 2014
filing date -
Jan 23, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A measuring system for continuously monitoring a high-voltage bushing provides for multi-stage, secure protection. The system includes a measuring circuit, a connection plug, a connection cable, and a three-stage protective circuit. When overvoltages occur at the measurement connection, each protective stage can produce a short circuit at the measurement connection to limit the voltage. A first protective stage responds at a response voltage U1. A second protective stage connected between the first stage and the measurement connection responds at a higher response voltage U2. A low-pass filter in the first protective stage decouples the first and second protective stages. The first stage responds to overvoltages at operating frequency, the second stage responds to high-frequency overvoltages. A third protective stage is connected between the measurement connection and the first protective stage in parallel with the measurement connection and includes a mechanical switch for short-circuiting when a third response voltage is present.
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