Transformer monitoring
Overheating of Transformers of any size can have disastrous consequences for electricity generators, their staff and customers alike. The 852Plus provides continuous alarm based monitoring of transformer cooling systems and peace of mind for the operator at the same time.
The 852Plus has been awarded National Grid approval with Type A status for unrestricted use on SuperGrid transformers at all NGC substations.
Oil Temperature Indicator
The Oil Temperature Indicator (OTI) measures the Top oil Temperature. This is a specific measurement location at the top of the transformer and the temperature data from it is used for control and protection for all transformers.
Winding Temperature Indicator
The Winding is the component with the highest temperature within the transformer and, above all, the one subject to the fastest temperature increase as the load increases. Thus to have total control of the temperature parameter within the transformer, the temperature of the winding as well as top oil, must be measured.
An indirect system is used to measure winding temperature, since it is dangerous to place a sensor close to the winding due to the high voltage. The Winding Temperature Indicator directly measures the CT current and uses the algorithms associated with IEC354 to provide accurate winding temperatures for all cooling gradients via the feedback system.