32results about How to "Avoid Harmonic Pollution" patented technology

The escalator energy-saving system comprises a first escalator and a second escalator which are opposite in running direction, are driven by a first frequency converter and a second frequency converter respectively and are provided with an energy-saving device. The energy-saving device comprises a first connecting end and a second connecting end which are respectively connected with DC buses of two frequency converters, an energy storage unit, and a first power conversion unit and a second power conversion unit which are connected between the connecting ends and the energy storage unit. The control unit detects bus voltage at the two ends and the state of the energy storage unit in real time and controls the working mode of the power conversion unit according to the bus voltage, and when one escalator goes down for power generation and the bus voltage rises, the control unit controls the corresponding unit to store energy into the energy storage unit; and when the bus voltage is reduced due to the ascending power consumption of the other escalator, the corresponding unit is controlled to release the energy in the energy storage unit for compensation. Automatic cyclic utilization of energy between the two escalators is achieved, electric energy is effectively saved, energy waste is avoided, a power grid is not polluted, the structure is simple, and implementation is convenient.

The application discloses a high-overload-resistance and harmonic-suppression ice-melting rectifier transformer, and relates to the technical field of transformers. The high-overload-resistance and harmonic-suppression ice-melting rectifier transformer comprises an oil tank, the iron core in the oil tank adopts a step-by-step stacking structure and a 45-degree full-inclined joint, and is fastened through a clamping piece module; three coil assemblies and a grounding electric shielding layer are arranged on a core column, the coil assembly comprises upper and lower windings, adopts a <2mm oxygen-free copper wire matched with a K transposition process, and a supporting block is arranged between adjacent wires to form an oil channel; the grounding electric shielding layer is composed of a copper foil shielding plate and a connecting plate and is grounded; and the oil tank forms a circulating heat dissipation system through an oil circuit, an oil pump and an air cooler. Through cooperation of multiple structures, the high-overload-resistance and harmonic-suppression ice-melting rectifier transformer reduces magnetic resistance and loss, improves structural stability, realizes efficient heat dissipation, suppresses harmonic pollution, enhances the anti-overload and anti-short-circuit capability, meets the demand of direct-current ice melting, and guarantees safe operation of a power grid in winter.