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Dołączył: 21 Lut 2011
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Skąd: England
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 Wysłany: Pią 8:26, 22 Kwi 2011 Temat postu: GHD glätteisen eos rep edge aox |
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Column switch electrical 10kV and application of the classification
Abstract: With the rapid development of the national economy, electricity consumption increased at the same time, customer reliability and power quality of power supply put forward higher requirements; 10kV column switching equipment in the distribution network in the segmentation and reasonable extension applications, to improve power supply reliability has achieved a lot. However, because of the imbalance in regional development, structure and layout of the distribution network the growing complexity of the switching equipment of all skill levels have different applications. Keywords: 10kV switchgear 1 Introduction With the rapid development of the national economy, electricity consumption increased at the same time, customers and the reliability of power supply for a higher power quality requirements; 10kV pole switching devices in distribution networks and the extension of the reasonable application of section, to improve the reliability of power supply made a contribution. However, because of the imbalance in regional development, structure and layout of the distribution network the growing complexity of the switching equipment of all skill levels have different applications. 2 10kV column switch electrical arc medium according to the classification of distinguish, through the compressed air, magnetic blowing gas materials, oil, SF6, vacuum several representative stages. 20 century, more than 50 years of oil circuit breakers, three-phase contact in the same room as their interrupter dielectric medium and are insulating oils, breaking capacity 1250A below the breaking fault current explosion hazard exists. In economically developed areas, has gradually eliminated the oil circuit breakers. SF6 circuit breakers and vacuum circuit breaker is developed in the 20th century, the product of 80 years, 90 years is widely used in China to become leading products to replace oil circuit breakers. The breaking current 16kA or more, breaking up to 30 times the number of short-circuit current can be 10 to 20 years of maintenance-free. Also have to install electrical operation and control with intelligent and 3 10kV pole line on the way electrical switch applications (1) circuit breaker. After the failure of the current setting of the entire trip current and time, generally with electromagnetic induction coil and the tripping linkage, both breaking, but also closing the circuit breaker short-circuit current, fault current breaking capacity higher, as the protection lines. Distribution network with circuit breaker protection but a short time, there is often grade trip disadvantages. (2) recloser. A current-voltage recloser and recloser two. Reaction after the fault current trip to coincide,[link widoczny dla zalogowanych], said current-recloser, recloser only do this trip with protection,[link widoczny dla zalogowanych], but also to achieve one to three times reclosing. Section of the fault segment starting from the last one by one out, until the judge to the fault segment,[link widoczny dla zalogowanych], because it takes several overlapping fault current, a greater impact on the power grid, and more segments, the number of coincidence to be more longer, so the sub- generally not more than 3. For branch lines and radial lines. Another loss of pressure in the line recloser tripping, reclosing after call after the delay, called the voltage recloser. Substation outlet breaker must coincide with the completion of the two fault isolation and restoration of electricity,[link widoczny dla zalogowanych], which for the first time for the discrimination of the fault segment overlap, based on the number of sub-point switch closing paragraph to determine the fault segments and fault isolation on both sides of Switch Blocking failure, the second coincidence for the restoration of the supply of non-fault segment, the entire overlap only one type of feeder fault current, fault isolation and restoration of electricity to complete a long time. Required for overcurrent protection circuit completed by the substation feeder does not apply to long lines, with the system capacity increases, this conflict has been gradually eliminated. For radiation-type or ring type of short-term way to achieve the primary automation. (3) slicer. To record the number of fault current pulses, in the absence of voltage when the fault current without current number reaches the preset value of the automatic gate latch on to form the current pulse count type slicer. Most sub-device used in conjunction with the recloser, auto-complete is expected to Words and blocking operation, with the detection and control of operating capacity. (4) load switches. The switch not only in the no-voltage current to disconnect,[link widoczny dla zalogowanych], but closing the fault current, breaking rated load current, the main section as a line. Due to low cost in the centralized power distribution automation used. Under manual operation, electric operation, automatic operation, intelligent operation mode of operation and control of different ways to achieve local control, distributed control, centralized control
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