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201results about How to "Maintain normal" patented technology

Emergency traction power supply system of electric motor unit

The invention discloses an emergency traction power supply system of an electric motor unit, which comprises a traction transformer used for reducing high voltage of a contact network, two rectifiers used for rectifying alternating current of secondary side windings of the traction transformer into voltage of middle direct current links, two inverters used for taking electricity from the middle direct current links and performing inversion into three-phase alternating current, a two-way auxiliary current transformer used for taking electricity from the middle direct current links and performing inversion into three-phase alternating current or taking electricity from a two-way charger and then performing boosting and rectification into the voltage of the middle direct current links, an auxiliary load used for obtaining the three-phase alternating current from the two-way auxiliary current transformer or the two-way charger by an auxiliary load power supply busbar, and the two-way charger used for obtaining the three-phase alternating current from a three-phase alternating current output side of the two-way auxiliary current transformer and performing voltage reduction and rectification on the three-phase alternating current into direct current to supply power to a lithium titanate battery and a direct current load which are connected with the two-way charger, or used for taking electricity from the lithium titanate battery and performing boosting and inversion into the three-phase alternating current to supply power to the auxiliary current transformer.
Owner:CHINA RAILWAYS CORPORATION +3

Method for prewarning and monitoring failures of secondary equipment of power system

ActiveCN102707178AImprove the method of operation monitoringQuickly find abnormal operationElectrical testingPower measurement by digital techniqueElectric power systemData information
The invention provides a method for prewarning and monitoring failures of secondary equipment of a power system. Based on the real-time acquisition of power consumption data information of the secondary equipment and data collecting and sharing of a data communication network, the warning fault state of the secondary equipment are logically forecasted and judged in situ by a master station system, and the result can be provided for dispatching personnel, protection personnel and maintenance personnel to serve as the reference of operation and maintenance in the next step. The method provided by the invention perfects the operation monitoring method of the secondary equipment, no longer completely relies on the warning information of the secondary equipment per se and provides auxiliary monitoring measures; by adopting the method, abnormal operation of the secondary equipment can be quickly discovered, and personnel on site can be reminded of resolving the problem promptly, so that further expansion of accidents is prevented and the incidence of burning during operation of the secondary equipment is effectively reduced; the whole-life management strategy of the secondary equipment is helped to be built, new management references are introduced and the management and maintenance of the secondary equipment of the whole system are perfected.
Owner:CHINA ELECTRIC POWER RES INST +1
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