大容量机组继电保护整定计算

菜单

摘要大容量发电机的造价昂贵，结构复杂，一旦发生故障遭到破坏，其检修难度大，检修时间长，要造成很大的经济损失，大机组在电力系统内占有重要地位，特别是单机容量占系统容量很大比例的情况下，机组的突然切除，会对电力系统造成很大的扰动。64227

为了满足电力系统稳定方面的要求，对于发变组故障时要求继电保护满足可靠性、灵敏性、选择性和速动性来故障切除。从而提高了发电机和变压器的保护配置合理性、整定计算原则的全面性和整定计算结果准确性的要求。本文首先，根据一次系统图及相应等效电抗图，计算相应的短路电流，为后期的保护整定提供数据依据。然后，分别对发电机和变压器进行了合理、规范的保护配置和整理各保护的整定原则。最后，对发变组中各保护的整定原则进行了详细的分析，对发电机配置的差动保护、对称过负荷保护、不对称过负荷保护、失磁保护、失步保护、启停机等保护，主变配置的差动保护、过励磁保护、零序保护、复压过流保护和非电量等保护进行了详细的整定计算，并结合灵敏度的要求得到了发变组各保护合理的整定定值。整定结果表明，本文提出的保护配置和整定方案适用于大容量机组发电机变压器的保护，可有效的规范大容量机组发电机、变压器的保护配置和整定计算。

毕业论文关键词保护配置，继电保护，整定计算，电力系统

毕业设计说明书（论文）外文摘要

Title Large capacity generator relay protection setting calculation

Abstract Large generators are expensive and the structure are complex,once destroyed, it is difficult and takes a long time for overhaul,causing great economic losses. Large units in the power system plays an important role within, especially in stand-alone capacity accounting system capacity a large percentage of cases, the sudden removal of large units, will cause great power system disturbances.

In order to meet the requirements of power system stabilizer, for transformer unit fails to meet the reliability requirements of protection, sensitivity, selectivity and speed and mobility to fault clearing.Thereby increasing the generator and transformer protection configuration rationality, setting calculation principles of comprehensiveness and accuracy of the results setting calculation requirements.Firstly, according to a system diagram and the corresponding equivalent reactance diagram, calculate the corresponding short-circuit current protection setting for the latter to provide the data basis.Then, respectively,configurate protection of the generators and transformers\ reasonable and standardized,and finishing setting the principle of each protection.Finally, each transformer unit protection setting principles for a detailed analysis of the configuration of the generator differential protection, overload protection symmetrical, asymmetrical overload protection, loss protection, stall protection, Kai shut-down protection main transformer differential protection configuration, overexcitation protection, zero-sequence protection, overcurrent protection and non-power complex pressure and other protection, and high plant configuration variable differential protection, overcurrent protection and non-power complex pressure such protection were detailed setting calculation, combined with sensitivity requirements have been the transformer unit protection setting a reasonable value.Tuning results show that the proposed protection configuration and tuning program for large capacity unit generator transformer protection, can effectively regulate large capacity units generator, transformer protection configuration and setting calculation.