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What Are The Characteristics Of The Transformer Oil Pump?
- Jul 12, 2017 -

Transformer oil pump - is a fully sealed structure, built-in submersible operation of the three-phase asynchronous motor direct drive a centrifugal or axial flow vane pump, dedicated to the transmission transformer insulation oil medium fluid machinery. Centrifugal transformer oil pump for transformer oil cooler; axial flow transformer oil pump (low head, large flow) for transformer chip heat sink.

According to the structure of the drive motor: the current domestic supporting ① traditional three-phase asynchronous motor dedicated submersible oil design of ordinary Transformer Oil Pump; ② axial air gap (disc motor) motor-driven disc Transformer Oil Pump. The difference between the two structures is mainly driven by different motor, the use of the function, the installation form is exactly the same. However, due to the unique role of the disk-type axial magnetic tension, the operation must be replaced in time wear the bearings to prevent the rotor caused by strong mechanical friction. At present, foreign countries are still widely used in the traditional three-phase asynchronous motor design of the ordinary type of transformer oil pump.

The cause of the fuel injection explosion is that the short circuit current and the high temperature arc inside the transformer make the transformer oil quickly aging, and the relay protection device can not cut off the power supply in time, so that the fault lasts for a long time, so that the internal pressure of the cabinet continues to grow, Of the oil and gas from the explosion-proof pipe or other weak strength of the box where the accident occurred.

The flow rate is irreplaceable for each particular type of pump, since only one point of the characteristic curve for each model pump is the most efficient. Pump work this point is called rated working point, the pump work in this area, not only high efficiency, and low noise, reasonable power consumption, smooth operation, no harmful eddy current impact and cavitation damage, to maintain long-term reliable operation.

The choice of the above working conditions is determined by the resistance curve of the pipe network system of the main transformer cooler oil circulation oil circuit. Different types of coolers and main transformer oil circulation structure, the pipe network characteristics of different curves. Pipe network system resistance characteristic curve and transformer oil pump working characteristic curve intersection is the oil pump rated working point. Therefore, the replacement of the transformer oil pump, different hydraulic parameters or reduce the hydraulic parameters of the alternative is not desirable. He relies on the main transformer's safe operation and the cooler's rated heat transfer capacity.

At present, the domestic power grid, bureau according to the requirements of Guodian: In order to improve the Transformer Oil Pump bearing operating life, the original 1450 r / min (4-pole motor) pump, to 1000 r / min (6-pole motor) the following pump.

1000 rpm (6-pole motor) transformer oil pump to achieve (4-pole motor) pump flow, head, is bound to rely on increased impeller diameter to solve. The increase in the diameter of the rotating machine will reduce the stability of the operation, and 6-pole drive motor than the 4-pole motor diameter to be large. In this way, in the alternative process, some old cooler installation size (such as equipped with 4B2 40-16 / 3V pump) is difficult to achieve. Changchun Nuo Sen Motor Co., Ltd. uses two-stage pump structure, the replacement of such pumps to solve the problem, but the manufacturing cost increases.