发明名称 |
CONDITION MONITORING METHOD AND APPARATUS FOR HIGH-VOLTAGE AC ELECTRICAL SYSTEMS |
摘要 |
Monitoring apparatus for monitoring partial discharge activity in an AC electrical system comprises: a pair (60) of high- and low-frequency sensors; a timing module arranged to receive a cyclic signal from the low-frequency sensor and to provide a timing signal derived from the timing of successive cycles of the cyclic signal; and a monitoring unit (66) arranged to digitise a signal from the high-frequency sensor, to capture the digitised signal as consecutive data blocks of varying duration, and to trigger the capture of each data block in response to the timing signal. A condition monitored electrical system comprises a variable-speed drive (VSD) and a motor (M) operated by the drive, wherein the pair (60) of sensors is arranged at an end of a cable supplying power from the drive to a winding of the motor. A sensor unit (60) for condition monitoring of a high-voltage electrical system comprises a split-core current transformer with a low-frequency winding, arranged for sensing a high-voltage AC waveform in a cable about which the transformer is positionable, and a high- frequency winding arranged for sensing pulses in the cable that originate from partial discharge activity. |
申请公布号 |
WO2016156876(A2) |
申请公布日期 |
2016.10.06 |
申请号 |
WO2016GB50942 |
申请日期 |
2016.04.01 |
申请人 |
HIGH VOLTAGE PARTIAL DISCHARGE LIMITED |
发明人 |
GIUSSANI, Riccardo;JOURES, Steve;POLLEY, Alex;RENFORTH, Lee;SELTZER-GRANT, Malcolm |
分类号 |
G01R31/34;G01R15/18;G01R31/06;G01R31/12 |
主分类号 |
G01R31/34 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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