继电保护课程设计--- 多电源电力系统的零序保护

《继电保护课程设计--- 多电源电力系统的零序保护》由会员分享，可在线阅读，更多相关《继电保护课程设计--- 多电源电力系统的零序保护（26页珍藏版）》请在毕设资料网上搜索。

1、- 1 - 摘要摘要 电力系统正常运行时是三相对称的，其零序、负序电流值理论上是零。多数的短路故障 是不对称的，其零序、负序电流电压会很大的，利用故障的不对称性可以找到正常与故障的区 别，并且这种差别是零与很大值的比较，差异更为明显。所以零序电流保护被广泛的应用在 110KV 及以上电压等级的电网中。 自动、迅速、有选择性地将故障组件从电力系统中切除，是故障组件免于继续遭到破坏 并保证其他无故障部分迅速恢复正常运行，是保证电力系统安全运行的最有效的方法之一，选 择 110KV 电力系统继电保护和自动装置的设计时遵 2 循其原则。自动重合闸是一种广泛应用 于输电和供电线路上的有效反事故措施。即当

2、线路出现故障，继电保护使断路器跳闸后，自动 重合闸装置经短时间间隔后使断路器重新合上。所以，在瞬时性故障法伤跳闸的情况下，自动 将断路器重合，不仅提高了供电的安全性，减少了停电损失，而且还提高了电力系统的暂态稳 定水平，增大了高压线路的送点容量，所以架空线路要采用自动重合闸装置。 关键词：三相对称 零序保护 自动重合闸 断路器 多电源电力系统的零序保护 - 2 - When the normal operation of power system is the three-phase symmetrical, the zero sequence and negative sequence cu

3、rrent value in theory is zero. Most of the short circuit fault is asymmetric, the zero sequence voltage and negative sequence current will be very big, failure of asymmetry can be used to find the difference between the normal and fault, and the difference is zero and the great value of comparison,

4、the difference is more apparent. So the zero sequence current protection is widely used in more than 110 kv voltage grade of power grid. Automatic, rapid, selective removal from the power system, fault components is fault components from continue to damage and ensure the normal operation of the othe

5、r parts of the trouble-free back quickly, is to guarantee the safe operation of the power system, one of the most effective way to select 110 kv power system relay protection and automatic device to follow the principle of its design. Is a kind of automatic reclosing is widely used in power transmis

6、sion and effective anti-accident measures on power lines. When circuit malfunction, relay protection after the circuit breaker tripped, automatic reclosing device makes the circuit breaker to close after short time interval. So, in the case of instantaneous fault spell trip, circuit breaker automatically overlap, not only improves the security of the power supply, reduce the power loss, but also improve the transient stability of power system, increasing the send capacity of high-voltage lines,