摘  要电力系统之中，起到最为关键的组成的部分就是电力变压器，作用是维持节点的电力系统和能量的传递以及能量的交换。与此同时，变压器在这种情况之下，还密切相关于整个大电力系统的稳定性发展和可靠性的发展。76910

其中，它对变压器的主变保护有如下的一些要求：①选择性——是指隔离开了系统中所存在的故障元件的同时也保护了所在设备的动作，并且缩小了它的停电范围，以能够确保无误地保证仍能继续运行系统中的无故障部分；②速动性——是指继电保护装配将故障尽快地排除掉，而且也是为了防止增加在大电流、低电压运转的设施和用户的时间，尽量准确地使损坏的范围减小，同时也使并列运行的系统它所在的地方的稳定性得到很大程度上的提高；③灵敏性——是在保护范围内所有的灵敏系数来准确地选取灵敏性；④可靠性——是指当变压器保护的时候，如果并不需要它动作，那么这时候就不会动作，也就是说这时候并不会产生误动，这是它所最基本的要求。 

本文先阐述了变压器如今的发展还有发展的现状，然后接着分析变压器所存在的各种不同的故障的类型以及它们对应的不正常的工作状态。本文以容量为10000KVA的变压器，电压等级35KV变10KV主变保护为例子，选取以复合电压过电流保护和过负荷保护，并且以瓦斯保护和差动保护为基础的保护的方案，并且对此方案的保护原理进行了大致的介绍，整定计算的依据是根据继电保护的原理和装置。本文还对变压器的选择、型号和容量的判断进行了简略的介绍。

该论文有图19幅，表1个，参考文献23篇。

毕业论文关键词：电力变压器  变压器保护  瓦斯保护  差动保护  后备保护  智能电网

Main transformer protection design of 10000KVA (35KV/10KV)

Abstract In the power system, the power transformer is the most important part, which plays a key role in the transmission and exchange of power system and energy, and is closely related to the stability and reliability of power system。

For transformer protection requirements: selective - refers to protection device, only the fault component removal from power system, power range minimize, to ensure system in fault free part is still able to safe operation; speed refers to relay protection device should be able to quickly cut off the fault, in order to reduce the user equipment and in high current, low voltage operation time and reduce the extent of the damage to equipment, improve the stability of parallel operation system; sensitivity, electrical equipment or line in the protected range malfunction or abnormal operation condition, protection device of reaction ability。 The sensitivity of the protection device, usually with the sensitivity coefficient to measure, the greater the sensitivity coefficient, the higher the sensitivity of the protection, and vice reliability - is the most fundamental requirements of the relay protection。 Transformer protection is not required to protect the action when it is not reliable action, that is, the error occurred。 At the same time the transformer protection in the provisions of the protection of the fault occurs when the action should be reliable action, that is, do not refuse to move。

Firstly, through fault types of power transformers and abnormal working state analysis, with a capacity for 10000kva and voltage rank 35kV 10kV main transformer protection, for example, gas protection and differential protection based on that of the composite voltage over current protection and over load protection, protection scheme, and puts forward the protection temperature of non electricity protection scheme。 The principle of protection and protection of the scheme is introduced, and the principle and device of relay protection setting calculation are introduced。 At the end of this  10000KVA(35KV/10KV)主变保护设计+梯形图:http://www.youerw.com/zidonghua/lunwen_88297.html