The disclosure includes embodiments of systems and methods for removing moisture from an electric power transformer. According to an embodiment, a moisture removal system includes a pump to move oil from the transformer into the system; one or more incoming oil moisture and temperature sensors to detect a first moisture level and temperature of oil; a processor to receive the moisture and temperature and determine an estimated paper moisture value of the insulation of the transformer, and compare the estimate to a target paper moisture value; and an overdry prevention bypass valve positioned in a first position to divert oil without drying when the estimated paper moisture value is equal to or less than the target value, and in a second position to channel oil through one or more drying cylinders when the estimated paper moisture value exceeds the target value.

The disclosure includes embodiments of systems and methods for removing moisture from an electric power transformer. According to an embodiment, a moisture removal system includes a pump to move oil from the transformer into the system; one or more incoming oil moisture and temperature sensors to detect a first moisture level and temperature of oil; a processor to receive the moisture and temperature and determine an estimated paper moisture value of the insulation of the transformer, and compare the estimate to a target paper moisture value; and an overdry prevention bypass valve positioned in a first position to divert oil without drying when the estimated paper moisture value is equal to or less than the target value, and in a second position to channel oil through one or more drying cylinders when the estimated paper moisture value exceeds the target value.

An aspect of the present disclosure provides a method for measuring a quantity of liquid in a liquid-insulated electrical component. The liquid-insulated electrical component includes a main tank (1) and an expansion tank (2) fluidly connected to the main tank (1). The method includes measuring a first pressure (P.sub.1) of the liquid at a first point in the main tank (1), measuring a second pressure (P.sub.2) of the liquid at a second point in the main tank (1), the second point being at a height (H) above the first point, measuring a third pressure (P.sub.3) of the liquid at a third point in the expansion tank (2), and determining the quantity of liquid in the liquid-insulated electrical component based, on the first pressure (P.sub.1), the second pressure (P.sub.2) and the third pressure (P.sub.3). Further aspects provide a liquid-insulated electrical component, particularly a transformer, more particularly a traction transformer (101) for a railroad vehicle (100), as well as a railroad vehicle (100) including said liquid-insulated electrical component

A transformer includes a transformer body, a tank, a conservator, a plurality of support fittings, and at least one mounting seat. Transformer body includes an iron core and a winding. Tank includes an upper tank, a middle tank, and a lower tank that are bonded together to form an internal space accommodating transformer body. Conservator is arranged at a position above tank. The plurality of support fittings are arranged side by side at intervals to support conservator. At least one mounting seat is bonded to both a peripheral wall of upper tank and a peripheral wall of middle tank, and fixed to tank, and the plurality of support fittings are attached.

An oil filtration system for purifying oil present in a reservoir. The system includes an inlet for receiving an inlet flow of contaminated oil from said reservoir, an outlet for releasing an outlet flow of purified oil to said reservoir, a vacuum housing in fluid communication with the inlet and the outlet, where the vacuum housing comprises an oil filter arranged in-side said housing, a first pumping unit which is arranged upstream of the vacuum housing, a second pumping unit which is arranged downstream of the vacuum housing, and a vacuum-generating means which is connected to the vacuum housing via a pumping tube, where the pumping flow rate of said second pumping unit is higher than the pumping flow rate of said first pumping unit.

An oil filtration system for purifying oil present in a reservoir. The system includes an inlet for receiving an inlet flow of contaminated oil from said reservoir, an outlet for releasing an outlet flow of purified oil to said reservoir, a vacuum housing in fluid communication with the inlet and the outlet, where the vacuum housing comprises an oil filter arranged in-side said housing, a first pumping unit which is arranged upstream of the vacuum housing, a second pumping unit which is arranged downstream of the vacuum housing, and a vacuum-generating means which is connected to the vacuum housing via a pumping tube, where the pumping flow rate of said second pumping unit is higher than the pumping flow rate of said first pumping unit.

A method of predicting a transformer state in consideration of whether oil filtering is performed includes receiving, by a transformer state prediction apparatus, transformer data of a transformer, determining, by the transformer state prediction apparatus, whether an oil of the transformer is filtered on the basis of the transformer data, and predicting, by the transformer state prediction apparatus, a state of the transformer on the basis of different prediction models depending on whether the oil is filtered.

A rupture reduction system for fluid-immersed electrical equipment includes a turret for mounting of a bushing. The turret is expandable in volume in response to a surge in pressure of the fluid in the turret. The expansion volume can be provided by an expandable section of the turret, which may include a bellows.

A rupture reduction system for fluid-immersed electrical equipment includes a turret for mounting of a bushing. The turret is expandable in volume in response to a surge in pressure of the fluid in the turret. The expansion volume can be provided by an expandable section of the turret, which may include a bellows.

A transformer including a transformer tank, an expansion tank, and piping connecting the tanks enabling liquid to flow there between. The piping includes a valve configured for liquid to flow from the transformer to the expansion tank when the pressure is above a predefined first threshold and for preventing the liquid to flow from the transformer to the expansion tank when the pressure is below the first threshold. The valve is also configured for liquid to flow from the expansion to the transformer tank when the pressure is below a predefined second threshold and for preventing the liquid to flow from the expansion to the transformer tank when the pressure is above the predefined second threshold.