Monitoring system to detect fluid leaks in an electrical apparatus

A method comprising:

• determining a temperature error based on a measured fluid temperature and an estimated fluid temperature;
• determining fault indicators based on the temperature error;
• analyzing the fault indicators by comparing the fault indicators to a specification;
• and
• if one or more of the fault indicators does not meet the specification:
• determining whether a fluid leak condition exists based on the analysis and an electrical health status indicator.

A monitoring system for an electrical apparatus, the monitoring system comprising:

• a temperature error module configured to determine a temperature error based on an estimated temperature of a fluid in an electrical apparatus and a measured temperature of the fluid in the electrical apparatus;
• a fault analysis module configured to determine a plurality of fault indicators based on the temperature error;
• a trend analysis block configured to compare the each of the plurality of fault indicators to an associated performance threshold and to assign each fault indicator to an alarm level based on the comparison;
• and
• a decision block configured to output a fluid leak indicator based on the alarm level of the fault indicators.