摘要
在电力系统中变电站变换电压、接受和分配电能、控制电力的流向和调整电压的电力设施,它通过其变压器将各级电压的电网联系起来。35kV变电站的可靠运行,直接关系着工农业生产、人民生活、社会进步。35kV变电所的改造设计对于确保电网安全、稳定运行,提高供电质量和供电可靠性有着至关重要的作用。
本次设计内容是工厂35kV变电站一次系统设计。首先通过对设计原始资料分析,计算全厂负荷,选择相应主变压器台数和容量,确定供电系统草图,然后对初定的系统图进行相应的短路计算和高压设备的选择及校验,选择和校验高压电路,最后对继电保护设施加以简要说明。结合课本的基础知识,根据变配电所的运行情况。以及各种变压器、开关柜、线路等电器设备的标准,具体的定量地选择电器设备。
关键词:变电站;一次系统设计;变压器;短路电流
Abstract
Substation in power system voltage transformation, acceptance and distribution of electricity, control the power flow and adjust the voltage of the power facilities, it will at all levels through its transformer linked voltage power grid. Reliable operation of the 35kV substation, directly related to the industrial and agricultural production, people's lives, and social progress. 35kV substation to ensure that the modified design for the power grid security, stability operations, to improve the quality and supply reliability of power supply has a vital role.With the substation well designed, power grids and electrical systems run more safely, economical, and stability.
This design is about 35kV substation’s primary design. First of all, through analyzing the original design materials, calculating the load throughout the factory and choosing the corresponding quantity and capacity of the main transformer, the concrete power supply system can be made accordingly. Then for the primary system, not only the relevant short-circuit should be calculated but also the high-voltage circuit should also be selected and examined. Meanwhile, the high-voltage circuit should also be selected and examined. Finally the relay protection of power system should be given a short explanation. According to the operation of the substations in our country and the standard of various electrical apparatus such as transformer, switch, circuit and so on, the electrical apparatus can be selected concretely and quantitatively with the combination of the basic knowledge of textbooks.
Key words: Substation;primary design;transformer;short-circuit