34results about How to "Small output capacity" patented technology

The invention provides an integrated standard device for field calibration of an extra / ultra high voltage capacitor voltage transformer (CVT). The device comprises a test power supply, a test lifting platform, a standard appliance, a measuring instrument and a vehicle platform, wherein the test power supply comprises cascade upper and lower level test transformers, a secondary compensating reactor and a voltage regulator; the standard appliance comprises cascade upper and lower level standard voltage transformers and a high voltage isolated transformer; the test lifting platform comprises a base, transmission mechanisms and insulating support members; the measuring instrument comprises a transformer calibrator and load boxes; all the equipment is fixedly installed on the vehicle platform;and the test lifting platform can lift in the vertical direction. The upper and lower level standard voltage transformers in the standard device can troubleshoot the standard device by way of mutual calibration in the field and complete field calibration of the extra / ultra high voltage CVT, without unloading.

The invention discloses a three-phase integrated power transformer low-frequency heating power supply system and its operating method. The system includes: an incoming line circuit breaker, which is used to realize input and cut-off operations of the input power supply; an incoming line contactor and an outgoing line contactor, It is used to realize the remote switching operation of the power supply of the whole machine; the phase-shifting transformer is used to realize the input power boost and the multi-pulse rectification input power formation; the low-frequency inverter includes multiple sets of power units for Realize three-phase low-frequency output; automatic power-off system is used to realize automatic power-off when the temperature is too high or the circuit connection line fails, and protect the entire low-frequency heating power system; control system is used to realize the control of the incoming circuit breaker, On-off control of incoming line contactor, outgoing line contactor, phase-shifting transformer and low-frequency inverter. The invention can greatly reduce the power consumption of the heating capacity of the power supply, and can improve the heat dissipation efficiency.

The invention discloses a control method for frequency-conversion starting of a diesel engine by utilizing a synchronous generator in an alternating-current diesel locomotive. The control method comprises the following steps of carrying out no-load pre-excitation according to a calculated no-load exciting current ifb; judging whether an exciting current reaches ifb, if the exciting current does not reach ifb, returning and continuously carrying out the pre-excitation; otherwise, carrying out initial positioning according to a preset initial position angle; judging whether the initial positioning is finished, if the initial positioning is finished, selecting a torque command curve according to a preset starting time; otherwise, returning and continuously positioning; carrying out torque loop control according to the torque command curve; judging whether the rotating speed of a motor reaches a preset ignition speed, if the rotating speed of the motor reaches the preset ignition speed, stopping the motor; otherwise, returning and continuously controlling. According to the control method, an air-gap field control strategy, in which the power factor is accurate to 1, of the synchronous generator is realized, and meanwhile, by designing an off-line calculation method for planning the torque command curve according to a preset starting finishing time, the output current of the motor required in a starting system is better optimized.