 Wysłany: Sob 7:01, 22 Sty 2011 Temat postu: mbt shoes ireland The design of the rural 35kV sub |
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| The design of the rural 35kV substation
A lot of old 25kV substation, one aging equipment, maintenance workload and escalating costs, and the effect is not obvious; secondary equipment from the oldest electromagnetic relay to the early microprocessor-based protection, and so at the same time protecting the transistor operation. The device structure is simple, breaking capacity is small, operation and maintenance inconvenient, running in the wrong move, refused to move, grade trip, to expand the scope of the phenomenon of power outages have occurred on the substation's safety, quality, efficient operation pose a great threat. Therefore, our rural areas will face a number of new 35kV substation and transformation, goal is to build At this stage, the construction of rural 35kV substation should normally meet the following requirements: ① small-capacity, point clouds, short radius; ② main connection is simple, safe and reliable electricity supply; ③ layout compact, small footprint; ④ equipment selection to improve supply reliability,mbt shoes ireland, economic operation and automation level of the premise; ⑤ combined with automated scheduling, taking into account unattended. First, the design principles and selection of equipment 1. The substation site selection first consider the elevation of the site, with or without submerged by the flood history of the site should be located in load center, convenient transportation to, inlet and outlet corridor to facilitate the introduction of overhead lines and leads, as less farmland, and requirements under the small towns, industrial parks and other urban planning left room for development. Secondly, the meteorological conditions in which substations are listed: the annual maximum, minimum temperature, maximum wind speed, ice thickness, seismic intensity, the average rate of lightning. 2. Main Electrical Wiring electrical main connection to run, reliable, simple and clear, easy to operate on the principle, and left room for development, the program uses: 25kV and 1 back into the outlet, 2 sets of main transformer; 35kV side of the isolation switch installed only the abolition of circuit breakers , co-operation with the isolation switch to match the new fuses for protection, 35kV and 10kV bus are single-bus arrangement, 10kV 6 back to the outlet is usually considered, including a return to the capacitor, the isolating switch and outlet are selected SF6 (or vacuum) circuit breaker for control equipment. 3. Major equipment selection (1) the choice of equipment configuration should seek to small, to ensure that advanced technology, stable and reliable performance, quality assurance,Converse pas cher, and service to keep up. (2) the two should be used within the main transformer, requiring energy conservation and on-load tap-type,UGG España, commonly used S10 or SZ10 transformer, transformer capacity according to load the case may be, but the two main transformer capacity ratio should not exceed 1: 3, the impedance voltage, variable ratio, should be the same connection group, the error does not exceed ± 5%, to provide the conditions for parallel operation after the transformer. (3) 1 used 2 sets of transformers S10-50kv35/0.4kV direct distribution transformers, installed in the 35kV or 35kV bus into the line on the outside, the transformer fuse controlled by drop. (4) high voltage circuit breakers should be used sF, circuit breakers, 35kV circuit breakers LWs a 35, 10kV circuit breakers LW3-10 type. (5) 35kV double back into the line, ready for the ring network project. (6) 35kV bus 120 using LGJX an aluminum wire, not a single bus segment cable, 10kV bus with sub wiring, outlet 4 to 6 back for good. (7) reactive power compensation capacity of main transformer capacity by 10% to 15% may be. (  Lightning Protection Measures: 35kV line with lightning conductor, lightning and surge arresters are used within the two. Angle steel and flat steel welded into the grounding, grounding resistance of less than 411. Each base of a lightning rod as a separate grounding, grounding resistance less in 1011, interior control console a single grounding, grounding resistance at the 411 or less. (9) control, protection, measurement part of the use of computer integrated automation system. (10) electricity and lighting: The transformer used s9-50/35 direct distribution transformer, T into the line connected to the 35kV side, as all the control, protection and substation maintenance debugging power. There is also the work of all the lighting and emergency lighting, when the whole of the power failure, emergency lighting circuits automatically switch to the DC system power supply. Second, the design should pay attention to the problem (1) automated device configuration according to conventional substation automation configuration, taking into account the possibility of future unattended in order to facilitate extensions. (2) Electrical equipment selection should give priority to domestic use of advanced equipment, to meet stable, reliable, easy installation,UGG Boots Outlet, no maintenance of the cycle is long, and small amount of maintenance required. Third,ghd stijltang, the concluding remarks along with computer technology in the power system application and development of substation equipment, computer, automation has become the mainstream of development and trends. China's rural 35kV substation will be realized (03)
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