Beijing Electrical Power Research Institute

Beijing, China

Beijing Electrical Power Research Institute

Beijing, China

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Patent
State Grid Corporation of China, Beijing Electric Power Company and Beijing Electrical Power Research Institute | Date: 2015-10-14

The invention provides a mixed-mode temperature measurement communication phase conductor and a temperature measurement communication system. The mixed-mode temperature measurement communication phase conductor includes: a stainless sleeving optical unit and a support line hinged with the stainless sleeving optical unit, wherein an aluminium wire is hinged outside the stainless sleeving optical unit and the support line; the stainless sleeving optical unit includes: multiple single-mode fibres and at least one multi-mode fibre, wherein fibres in the stainless sleeving optical unit are mutually hinged. The invention realizes whole-distance temperature measurement of conductor by setting the single-mode fibre to perform communication and the multi-mode fibre to perform temperature measurement.


Patent
State Grid Corporation of China, Beijing Electric Power Company and Beijing Electrical Power Research Institute | Date: 2013-07-16

The disclosure provides a mixed-mode temperature measurement communication phase conductor and a temperature measurement communication system. The mixed-mode temperature measurement communication phase conductor includes: a stainless sleeving optical unit and a support line hinged with the stainless sleeving optical unit, wherein an aluminium wire is hinged outside the stainless sleeving optical unit and the support line; the stainless sleeving optical unit includes: multiple single-mode fibres and at least one multi-mode fibre, wherein fibres in the stainless sleeving optical unit are mutually hinged. The disclosure realizes whole-distance temperature measurement of conductor by setting the single-mode fibre to perform communication and the multi-mode fibre to perform temperature measurement.


Patent
Beijing Electrical Power Research Institute, Sinopec, State Grid Corporation of China and Beijing Electric Power Company | Date: 2012-01-20

Disclosed in the disclosure are a method and a device for processing geological information. The method for processing the geological information comprises: acquiring multiple geological image graphs; determining the relation between the image coordinate and the ground coordinate of each of the multiple geological image graphs by an imaging mode of geological images; and joining the multiple geological image graphs together according to the relation between the image coordinate and the ground coordinate of each of the multiple geological image graphs. The large-scale ground images can be acquired by processing the geological images according to the present disclosure.


Patent
State Grid Corporation of China, Beijing Electric Power Company and Beijing Electrical Power Research Institute | Date: 2013-07-16

A meter circuit apparatus and a method for implementing metering are disclosed, wherein the apparatus includes: an electric energy meter (1), a combining unit (2) and a current transformer (3), wherein the current transformer (3) is connected to the combining unit (2) and the electric energy meter (1) and is configured to acquire an electrical quantity of a intelligent substation, and input the electrical quantity to the combining unit (2) and the electric energy meter (1); the combining unit (2) configured to combine and synchronize the electrical quantity inputted by the current transformer (3), and forward a processed digital signal in a specific format; and the electric energy meter (1) is configured to charge for the electrical quantity inputted by the current transformer (3). Requirements of regular metering and intelligent measurement are satisfied within adding an independent current transformer (3).


Patent
Beijing Electrical Power Research Institute, Beijing Electric Power Company, State Grid Corporation of China and Sinopec | Date: 2014-03-26

Disclosed in the invention are a method and a device for processing geological information. The method for processing the geological information comprises: acquiring multiple geological image graphs; determining the relation between the image coordinate and the ground coordinate of each of the multiple geological image graphs by an imaging mode of geological images; and joining the multiple geological image graphs together according to the relation between the image coordinate and the ground coordinate of each of the multiple geological image graphs. The large-scale ground images can be acquired by processing the geological images according to the present invention.


Wang L.,Tianjin University | Du B.,Tianjin University | Ren Z.,Beijing Electrical Power Research Institute
Gaodianya Jishu/High Voltage Engineering | Year: 2014

To obtain the degradation condition of insulation in crosslinking polyethylene (XLPE) cables which has been operated for many years, and to understand the mechanism of the degradation, we analyzed the insulation of 14 XLPE cables returned from 110 kV and 220 kV transmission lines using the thermo gravimetric method, infrared spectrum, mechanical strength test. Moreover, we researched the relationship of thermal stability of insulation materials, the material composition and mechanical properties with the degradation, and analyzed the historical operation data of the 14 samples. The results show that four of 14 cables have degradation in their insulation, and all these four cables are heated by fault current or external high temperature. It is also concluded that initial decomposition temperature, hydroxyl index, and fracture energy have good consistency in terms of characterizing the status of XLPE cables' insulation degradation: when insulation has degradation, its initial decomposition temperature and fracture energy decrease, and its carbonyl index increases. The cross-linked cable subjected to large fault current shock or external high temperature will accelerate insulation degradation.


Wu Z.-G.,Beijing Electrical Power Research Institute
2016 IEEE International Conference on Mechatronics and Automation, IEEE ICMA 2016 | Year: 2016

The supercritical unit boiler systems of a certain power plant, with the properties of time-varying, large delay, large inertia, etc., shows the characteristics of long stable time and great fluctuation in main parameter like the main steam pressure when the AGC (Auto Generation Control) is used and the load changed frequently. To solve the above problem that the controlled parameter is unstable, the generalized predictive control and the fuzzy control technology are adopted in the coordination control system and the problem is been efficiently improved. The practical application indicates that when the unit runs at the rate of 2%/min, it works fast and steady with a smooth transition and small overshoot in the main parameter and also the mainstream deviation is within 0.4MPa, which greatly improves the stability and safety of the unit. © 2016 IEEE.


Li A.,Beijing Electrical Power Research Institute
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2015

The flow field in the steam ejector, a key component of the equipment dedicated to low temperature multi-effect seawater desalination, was empirically approximated, mathematically modeled via modification of Sokolov design-method, theoretically analyzed and numerically simulated with software CFD to optimize its design. The influence of the structure of the newly-designed ejector, including the sizes of different sections, on the jet coefficient was investigated by simulation. The calculated results show that the optimized ejector outperforms the conventional one. For example, its jet coefficient of 1.35 is much higher than 0.96 of the old ejector. In addition, the sizes in the major sections of the novel ejector lie in the best range. We suggest that the newly-developed steam ejector may be of much technological interest. ©, 2015, Science Press. All right reserved.


Zhang X.,Beijing Electrical Power Research Institute
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2016

With the transformation and upgrading of energy saving and emissions reduction action plan of coal-fired power plant (2014-2020), a wide range implementation of low nitrogen burner alteration has been carried out in the domestic coal-fired power plant. After the massive application, some common problems occurring in the operation, such as furnace CO content rise sharply, and the combustible content in the ash rise. This article provided the analysis of many sets of 600 MW unit combustion adjustment test data, presented the key factors influencing the furnace combustion characteristics. The numerical simulation was also carried out to give the further explanation. The results show that the top air of SOFA should be reduced in the media low load operation, the flame center lowered down. The adjustment of the reheat steam temperature can be relied on the swing of the primary combustion zone and SOFA zone. Due to the primary combustion zone is compressed after the low nitrogen transformation, it is advisable to increase AA layer to reduce combustible content in the slag. In order to reduce the CO content in the furnace, it can be appropriately to increased air volume of AB and CD layer to above 40%.. © 2016 Chin. Soc. for Elec. Eng.


Wang F.,Beijing Electrical Power Research Institute
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2015

In once-through boiler, main steam temperature control system was complex, which had the large control chain span. According to the analysis of the characteristics of main steam temperature control system, a networked predictive control method based on reverse transfer strategy for the cascade system was presented. The recursive least squares(RLS) with forgetting factor was used to identify subsystems, which was adapted to the need of once-through boiler's variable conditions. In order to make the desuperheat spray have the enough adjustment range, the setting points of the reverse transfer strategy were designed by the online identification of the main steam temperatures' leading segments. Constraint conditions of predictive control were used to ensure that the intermediate point's temperature and the superheater outlet temperatures had enough superheat. A simulation for superheat steam temperature control system of one once-through power plant was carried out by the presented method. The result shows that the control system's effect is better than the conventional cascade control system. © 2015 Chinese Society for Electrical Engineering.

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