摘要:本次设计的课题是一个220KV变电站初步电气设计，该站建成后与220KV电网相连，具有220KV 、110KV、35KV等三个电压等级，110KV、35KV线路以接受区域小水电电力为主，区域小水电电力大部分向220KV主网输送，小部分就地消化。

　　　本站位于镇郊，地势平坦，交通便利，无环境污染，站址工程地质良好。

　　　由于该站主要用于丰水季节区域小水电电力外送主网，停电对小水电电力生产及整个电力系统的稳定运行造成重大影响，因此，本次设计的变电站主变采用一台SSZ10-40000/220KV型三绕组有载调压变压器，容量比为100/100/100，两台互为备用，即使有一台主变停电后，也可由另一台主变带全部外送电力的70%以上，提高了供电的可靠性。远期设计的变电站主变采用两台SSZ10-40000/220KV型三绕组有载调压变压器，容量比为100/100/100，两台互为备用。

　　　220KV侧主接线最后采用双母线接线，110KV侧采用双母线分段接线， 35KV侧也采用单母线分段接线。

　　　35KV侧装设两台站用变压器，分别接于两分段母线上，平时两台站用变压器分列运行，当一台站用变出现故障，分段断路器由自投装置动作合闸，实现备用。由于本站110KV、35KV线路所接的机组大部分为同步电机，具有调相功能，故不考虑无功补偿问题。

　　　本变电站配电装置采用普通中型配电装置，110KV及35KV采用断路器单列布置，将隔离开关放置母线下，使其与另一组隔离开关电器距离增大，缩短配电装置的纵向距离。

　　　主变中性点及出线均装设避雷器，中性点经隔离开关直接接地，并装设有两段零序保护及放电间隙保护。

　　　本次设计论文是以我国现行的各有关规范、规程和技术标准为依据。此设计是一个初步设计，主要根据任务书提供的原始资料，参照有关资料及书籍，对各种方案进行比较而得出的。

关键词：220 KV；升压；设计

Abstract:The subject of this design is a 220KV substation preliminary electrical design of the station after the completion of the 220KV grid connected 220KV, 110KV, 35KV three voltage levels, 110KV, 35KV line to accept the regional small hydro power-based, regional small hydropower power to the main network of 220KV transmission, a small part of in situ digestion.

The site is located in the suburbs of the town, flat, convenient transportation, and pollution-free sites for engineering geology. Since the station is mainly used for small hydro electric power in the wet season area to send the main network, and power outages have a significant impact on small hydro power production and the stable operation of the entire power system, therefore, the design of the substation main transformer a SSZ10-40 000 / 220KV-type three-winding OLTC transformer capacity than 100/100/100, two mutual backup, even if there is a main transformer power outage, but also may be another main change with all outgoing more than 70 percent of the electricity to improve the reliability of electricity supply. Forward design of the substation main transformer in two three-winding SSZ10-40000/220KV type OLTC transformer capacity than 100/100/100, two mutual back up.220KV side of the main wiring Finally, the dual-bus connection, 110KV side of the double busbar connection, 35KV side Single Bus wiring. 35KV side of the transformer installation of two stations, respectively, then the two segmented bus, usually two stations, transformers run, when a station transformer failure, the section breaker action closing of the switch device, to achieve an alternate. t does not consider the problem of reactive power compensation. Substation distribution devices and medium-sized power distribution equipment, 110KV and 35KV circuit breaker single row layout, the isolation switch is placed in the bus under it with another group of isolation switch electrical distance increases, shortening the longitudinal distance of the power distribution unit. The main transformer neutral point and the outlet are installed arrester, the neutral point directly to ground isolation switch and fitted with two zero-sequence protection and discharge gap protection.

The design thesis is based on the current norms, procedures and technical standards as the basis. This design is a preliminary design, mainly based on raw data provided by the mission statement, with reference to relevant information and books, a variety of programs to compare the obtained.

Key word:  substation ; ectrical ; design