On-line diagnostic method and control of dielectric behavior of power transformers and apparatus for making the same

摘要

The method in which the relative humidity (RH) of the oil charge (102) and at least one temperature (To) of the oil charge (102) are continuously measured on the transformer (1) by the control computer (4), the measured quantities are stored in the control computer (104) ). This calculates and stores the water content (Qv) in the oil charge (102) and calculates the theoretical dielectric strength (Up, t) of the oil charge (102). It is then compared with the measured value of the dielectric strength (Up, lab) of the oil from the oil filling (102) in the laboratory to determine the time point of the oil sample from the oil charge (102). The results serve for on-line diagnostics of the dielectric behavior of the transformer (1) and for the on-line control of its dielectric behavior. The device consists of a transformer (1) to which the moisture sensor (2) of the oil charge (102), the upper temperature sensor (3), the control computer (4) and the temperature controller (6) are connected. In the container (10) there is an active part of the transformer (1) consisting of the winding (101) and the magnetic circuit (100). The active part of the transformer (1) is embedded in the transformer oil cartridge (102). The upper part of the container (10) is connected by a downcomer (13) to a conservator (12). An oil charge cooler (102) is connected to the right and to the left side of the container (10) by the upper sleeve (111) and the lower sleeve (112). A chassis (113) of a cooler (11) provided with a fan (114) is mounted on the cooler (11). On the left side, the transom container (10) is equipped with a sampling tap (14). An upper sump (31) of the upper oil filling temperature sensor (3) and a nozzle (21) of the oil filling moisture sensor (2) (102) is incorporated into the upper sleeve (111). Upper temperature sensor (3)