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340results about How to "Increased operating life" patented technology

Dynamic capacity increasing method for oil-immersed transformer

The invention relates to a dynamic capacity increasing method for an oil-immersed transformer, and belongs to the field of transformers. The method includes the steps that heat conduction process in the transformer is simplified into a circuit model; winding hot-spot temperature, top oil temperature, average oil temperature, average winding temperature of the transformer under the current load condition are calculated; according to the limit that the winding hot-spot temperature does not exceed 140 DEG C, whether temperature in the transformer will exceed the limit temperature or not under the current load and environment conditions is calculated, whether a temperature limit value is reached or not if long-term emergency loads or short-term emergency loads occur at the moment is calculated, and if the temperature in the transformer possibly exceeds the limit value of the short-term emergency loads, the time for reaching the limit value and the finally reached steady state temperature are calculated to serve as alarm signals; if it is monitored that the temperature will exceed the standard within t minutes, an early-warning signal is sent out, certain time delay is set, and if the loads are not reduced within the set time delay, a cooling fan of the transformer is turned on. Long-term continuous operation of cooling equipment can be avoided, and operation life of the cooling equipment is prolonged.
Owner:SHANGHAI MUNICIPAL ELECTRIC POWER CO +1

High-conductivity non-heat-treatment type moderate-intensity aluminum alloy wire and production method thereof

InactiveCN102634695ASave construction investmentImproved resistance to overloadIngotUltimate tensile strength
The invention discloses a high-conductivity non-heat-treatment type moderate-intensity aluminum alloy wire and a production method of the high-conductivity non-heat-treatment type moderate-intensity aluminum alloy wire. The high-conductivity non-heat-treatment type moderate-intensity aluminum alloy wire is produced by finely selecting ingredients and contents of aluminum alloy and conducting process control. The specific steps are as follows: selecting Fe, Si, Mg, Cu and Re with different weight percents, melting aluminum ingot with the content not more than 0.03% in a vertical melting furnace, adding alloying elements in a heat insulation furnace, stirring, refining, conducting on-the-spot contents rapid analysis, carrying out content adjustment, and standing, enabling the aluminum ingot and the alloying element into a continuous casting machine for casting, rolling to be a circular aluminum alloy rod on a continuous rolling machine, pulling the circular aluminum alloy rod to be a circular aluminum alloy wire and twisting the circular aluminum alloy wire to be a conductor for aerial power transmission and distribution. According to the application of the aluminum alloy wire and the production method of the aluminum alloy wire, the aluminum alloy wire directly replaces the generally used aluminum conductor steel reinforced and is an energy-saving, environment-friendly and novel wire.
Owner:FAR EAST CABLE

Method and special device for comprehensive control of storage battery pack

The invention relates to a method and a special device for the comprehensive control of a storage battery pack, which is characterized in that: storage batteries are discharged or charged by measuring the surface temperature of each storage battery of the storage battery pack and the terminal voltage of each storage battery of the storage battery pack; and a storage battery open circuit alarming signal or a storage battery pack overvoltage alarming signal is output by measuring the floating charge current of the storage battery pack. The special device consists of a main machine (1) and a plurality of monitoring and controlling units (11) with the same structure, wherein the main machine (1) comprises a main control circuit (10), a floating charge current measuring circuit (2), a bus voltage measuring circuit (3), a charge module circuit (4), a discharge module circuit (5), a liquid display (7) and a keyboard input circuit (8). The monitoring and controlling units (11) are parallelly connected; and the output ends of the charge module circuit (4) and the discharge module circuit (5) are connected with the charge control input end and the discharge control input end of charge and discharge control circuits (13) in the monitoring and controlling units (11) respectively. The method and the device are widely used for detecting the storage batteries for power plants, transformer substations, telecommunication and the like.
Owner:GUANGZHOU QIANSHUN ELECTRONICS EQUIP

Method and system for managing energy in echelon battery pack energy storage station

The invention discloses a system for managing energy in an echelon battery pack energy storage station. The system adopts a distributive topology structure and includes an echelon battery module, an energy storage converter and a monitoring system. The monitoring system is set with monitoring cycles each of which includes the following steps when begins: 1. a charge state acquisition unit which is disposed inside the echelon battery module on each branch acquiring the charge state of each echelon battery module, uploading the charge state to the monitoring system through a CAN bus; 2. the monitoring system, based on the charge state of the echelon battery module of each branch and a dynamic power value that is set, calculating the power value that requires real-time controlling of each branch, issuing the power value to a corresponding energy storage converter for performing control, further controlling the real-time power in charging and discharging of each branch. According to the invention, the system ensures that the overal power meets systematic requirements, and the operation efficiency and service lifetime of the system is increased, and the risks of ineffectiveness of a single branch caused by over-charging or over-discharging of a single branch.
Owner:NIO ANHUI HLDG CO LTD

Composite contactor

The invention relates to a composite contactor which belongs to the field of electric switches, in particular to a contactor suitable for powering on and off a power capacitor. In the invention, an input power supply is subjected to current limit by a capacitor voltage drop circuit and rectification by a rectifying circuit and used for supplying power to a control coil of the contactor; the capacitor voltage drop circuit is connected with a starting electronic switch in parallel, the control end of the starting electronic switch is connected to a control circuit, and the control circuit is connected with a working power supply; a voltage zero passage detection circuit and a controllable silicon circuit are connected to two ends of a mechanical contact of the contactor in parallel; and the output end of the voltage zero passage detection circuit and one on control end of the controllable silicon circuit are connected to the control circuit, while the other on control end of the controllable silicon circuit is connected to a contact bridge of the contactor. The control coil of the composite contactor adopts a capacitor voltage drop direct current working manner, and the controllable silicon circuit adopts a design with multiple control ends, so that the composite contactor has the advantages of environmental protection, energy saving, strong anti-jamming, power on work, power on with voltage zero passage, power off with current zero passage, short controllable silicon on time, high reliability and long operation service life.
Owner:GUANGZHOU JINSHI ELECTRONICS

On-line monitoring and instant warning and fault diagnosis system of wind generating set

The invention discloses an on-line monitoring and instant warning and fault diagnosis system of a wind generating set. The on-line monitoring and instant warning and fault diagnosis system is composed of a lower computer (1) and an upper computer (5), wherein the lower computer (1) is installed on the wind generating set and is in communication with the upper computer (5) through a wired or wireless network. When the on-line monitoring and instant warning and fault diagnosis system works, the upper computer (5) transmits a start instruction to the lower computer (1), and then the lower computer (1) starts to collect signal data, carries out on-line instant warning on abnormalities and faults and stores signals or signal feature information; the upper computer (5) receives and stores the signals uploaded by the lower computer (1) or the signal feature information uploaded by the lower computer (1), analyzes and processes the signals or the signal feature information and generates various report forms according to needs. The on-line monitoring and instant warning and fault diagnosis system can carry out on-line instant warning and trend analysis on the operating state of the wind generating set and carry out forecasting and early warning on the potential faults, and has significant value for reducing sudden faults of the wind generating set, reducing loss caused by standby and the like.
Owner:北京普拉斯科技发展有限公司

Detection method of early fault of cable based on complex wavelet singularity detection

ActiveCN102721889AAvoiding Recurring Voltage TransientsIncreased operating lifeElectrical testingPower flowDecomposition
The invention discloses a detection method of an early fault of a cable based on complex wavelet singularity detection. The method mainly comprises the following steps of: acquiring a current signal of a cable to be detected in a power distribution network, and performing N-layer discrete wavelet transform on the current signal by using complex wavelets to obtain a wavelet transform coefficient on each decomposition level; and extracting amplitude information of a wavelet coefficient on each decomposition level, tracking the modulus maximum of the wavelet coefficient on each decomposition level, and recording a point on which the modulus maximum occurs in each decomposition level, wherein the corresponding occurrence moment of a first recorded modulus maximum point is the occurrence moment of an early fault, and the corresponding occurrence moment of a last recorded modulus maximum point is the ending moment of the early fault. According to the method disclosed by the invention, the early fault of the cable can be detected effectively, so that a defective cable can be pre-warned; and measures are adopted before the occurrence of the fault, and therefore losses caused by a permanent fault are reduced greatly, the running safety of a power grid is enhanced, and the running service life of the cable is prolonged.
Owner:SOUTHWEST JIAOTONG UNIV

Block type end plate structure for measuring current distribution of PEMFC

ActiveCN102110818AGuaranteed a high degree of similarityEasy to meet corrosion resistanceCell electrodesFuel cell auxillariesPower flowCurrent distribution
The invention relates to a block type end plate structure of a PEMFC (Proton Exchange Membrane Fuel Cell). The structure comprises an insulating motherboard and n sub collector blocks (n is a positive integer equal to or larger than 2); grooves are formed on the insulating motherboard, the sub collector blocks are embedded in the grooves on the insulating motherboard, and after the surface on oneside of the insulating motherboard, on which the sub collector blocks are embedded, is integrally flatten-milled, a normal reaction gas flow field is curved; conductive metal collector bars vertically penetrating through the insulating motherboard are arranged on the sub collector blocks; one end of each collector bar penetrating through the insulating motherboard is connected with a current output conducting wire of the PEMFC; and a current mutual induction element is arranged on the conducting wire. Compared with the prior art, the invention has the distinguished advantage that the cell temperature can be flexibly controlled through circulating water, and the flow field is curved after tensioning and flatten-milling are performed, so that a similarity to a normal flow field plate is guaranteed. Anyhow, the design of the end plate realizes the blocking structure while a flow field plate, a cooling plate and a collector plate are integrated, and is a novel block type end plate structure for measuring current distribution.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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