Transformer Electric Power Control of Mine Submersible Pump

Type of Transformer Electricity Control for Mine Submersible Pump Transformer
    Low-pressure mine drainage pump starts, the need to go through the transformer 6kV or 3kV high voltage into low-voltage motor to adapt to the rated voltage, usually 660V or 380V. Mining transformers are divided into mine type and mining type explosion-proof type. Mine general type has KSJ series, KSJL series, only applicable to mine underground no explosion dangerous place; mine explosion-proof type has KSGB type and so on, adapted to have the explosion danger place.
    KSJ-type power transformers are mine-type electrical equipment in general, on both sides of the tank with high and low voltage cable junction box. In order to avoid the oil pillow and the tank connection pipe plug explosion occurred, the upper oil left oil expansion space, the top cover oil filler plug is equipped with ventilation holes. Transformer oil due to high temperature decomposition of the gas, released from the hole in the plug, remove the plug can be added inward insulating oil.
   Transformer high voltage winding with adjustable secondary voltage ± 5% of the tap. When the supply voltage is longer than 95% of the rated voltage, the tap is adjusted to a 5% of the terminals; the other hand, when the power supply voltage is higher than 105% of the rated voltage, the tap adjustment in the +5% To ensure that the low-voltage side of the normal.
    In order to meet the two kinds of power supply voltage level, the secondary winding has two kinds of wiring ways (star, triangle connection), 660V for Y wiring, 380V for △ wiring.
    Under normal circumstances, the mine drainage pump transformer to ensure that there is a run, a spare. Two transformers can run side by side, but also run separately. Two transformers run side by side to meet the following conditions:
    1, the same wiring group.
    2, variable ratio difference shall not exceed 0.5%,
    3, the short circuit voltage difference shall not exceed 10%,
    4, two transformers than the capacity of not more than 3: 1,
    Insulation aging caused by the main transformer is the temperature rise, the general oil-immersed transformer using A-class insulation, A-class insulation of the maximum allowable temperature of 105 ℃, the coil allows the temperature rise of 65 ℃. The allowable temperature rise of the transformer oil is 55 ° C.
    KSGB-type transformer for the flameproof transformer, the internal oil-filled, shell has a greater intensity. High and low voltage coils are multi-layer cylindrical structure, the transformer is H-class insulation, can work at 165 ℃ long-term operation temperature.