Abstract: A system includes: an electrical apparatus that includes: a housing that defines an interior space; an active portion in the interior space; and insulation configured to electrically insulate at least part of the active portion. The system also includes a monitoring apparatus configured to: receive measured data from the electrical apparatus; determine a load forecast for the electrical apparatus based on the measured data; determine whether a pre-determined time interval has elapsed; and after the pre-determined time interval has elapsed: estimate an actual amount of life lost for the insulation during the pre-determined time interval that elapsed based on the measured data; estimate a predicted amount of life lost for the insulation during one or more future time intervals based on the load forecast; and estimate a remaining service life for the electrical apparatus based on the actual amount of life lost and the predicted amount of life lost.

Abstract: An electrical apparatus includes: a housing that defines an interior space; an active portion in the interior space, the active portion including one or more electrically conductive coils; a fluid in the interior; and a control system configured to: determine a difference between a measured temperature of the fluid and an estimated temperature of the fluid; and determine whether a performance condition exists based on the difference.

Abstract: A system includes a monitoring module configured to: receive a first indication related to a three-phase input of a three-phase AC electrical asset; receive a second indication related to a three-phase output of the three-phase AC electrical asset; determine performance metrics for the three-phase AC electrical asset based on the first indication and the second indication; determine error metrics by comparing each determined performance metrics to a pre-determined estimated performance metric; compare each of the error metrics to one of a plurality of pre-determined thresholds, the thresholds being determined when the three-phase AC electrical asset is in a healthy condition; and determine whether a developing fault condition exists in the three-phase AC electrical asset based on the comparison.

Abstract: Voltage samples are collected for a source and loads connected thereto by an electrical network. Respective negative sequence voltage difference values are generated for respective source/load pairs from the voltage sample. A connection (e.g., a loose connection) in the electrical network is identified based on the generated negative sequence voltage difference values. The identified connection is reported to a user. Identifying a connection in the electrical network may include identifying at least one source/load pair having an associated negative sequence voltage difference value that meets a predetermined criterion and identifying the connection based on the identified at least one source/load pair. Identifying the connection may include identifying at least one source/load pair having an associated negative sequence voltage difference value with a magnitude falling outside of at least one range associated with the at least one source/load pair.