50 Installation Guide
Q. Are any special precautions required when the transformer is put under vacuum?
A. No there are no special precautions required. The CoreSense is inherently tolerant to vacuum.
Q. Does the CoreSense require planned maintenance?
A. There is no planned maintenance required during the operational life of the product.
Q. What is the expected operating lifetime of the CoreSense?
A. The CoreSense is expected to operate for up to 15 years with no maintenance. This is enabled by the
solid-state design of the CoreSense with no moving parts. Also, the CoreSense does not have a gas/oil
separation stage based on a membrane or headspace; it senses hydrogen and moisture directly in the oil.
Q. Can the CoreSense be used with transformers that use ester oils as an insulating fluid?
A. The CoreSense is calibrated in transformer mineral oil. It also works in ester oils. The hydrogen will be
reported accurately. The moisture measurement in percentage (%) will also be reported accurately, but
the moisture value in ppm may need to be adjusted with some calibration factors. Once the calibration
factors are known, this can easily be done using the CoreSense web interface.
Q. How does data storage work on the CoreSense?
A. The CoreSense stores 12 months of data on a First-In-First-Out (FIFO) basis.
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