探讨继电保护装置的时限配合问题

探讨继电保护装置的时限配合问题

电力系统的不断发展和安全稳定运行给国民经济和社会发展带来了巨大的动力和效益。企业的电力系统安全运行就成为了重中之重。一旦发生故障,如果不能及时有效控制,就会越级到变电站扩大事故范围,造成大面积停电,给社会和企业造成直接的经济损失,甚至会产生锅炉爆炸、有毒气体排放等危及社会安全的危险后果。继电保护装置就是保证电力设备安全和防止及限制长时间大面积停电的最基本、最重要、最有效的技术手段。继电保护装置一旦不能正确动作,就会扩大事故范围,酿成严重后果。The development of power system and the safe and stable operation of great power and benefits to the national economy and social development. The safe operation of the power system of enterprises has become a priority among priorities. Once the fault happened, if not timely and effective control, will leapfrog into the substation expansion of the scope of the accident, causing blackouts, causing direct economic losses to the society and enterprises, dangerous consequences will even produce boiler explosion, toxic gases endanger social security. Relay protection device is to ensure safety and prevent electric equipment and long time blackout of the most basic, most important, the most

effective technical means. Relay protection device once cannot correct action, will expand the scope of the accident, causing serious consequences. 供电企业已广泛应用集测量、保护、控制和通讯于一体的智能化微机型继电保护装置。但因为微机继电保护装置及配套措施价格昂贵,维护费用高。在大量的工矿企业、民用建筑等变电站和配电室中,还在大量使用电磁型反时限继电保护装置。这些继电保护装置设备老化、精度不够,尤其时间元件精度极差。当被保护线路内出现短路、过流等故障时,常会导致保护时间元件不精准而造成越级跳闸现象。不但降低了对用户供电的可靠性,同时也给供电企业安全运行造成了重大隐患。Intelligent power supply enterprises have been widely used in measurement, protection, control and communication in one of the microcomputer relay protection device. But because the price of microcomputer relay protection equipment and supporting measures of expensive, high maintenance costs. In a large number of industrial and mining enterprises, civil construction of substation and power distribution room, still use a lot of electromagnetic inverse time relay protection device. The relay protection device aging equipment, precision is not enough, especially the time element accuracy range. When the protected circuit

short circuit, over-current fault, often causes the protection time element is not accurate due to override trip phenomenon. Not only reduce the reliability of power supply to the user, but also caused great hidden trouble to the safe operation of power supply enterprises. 使用电磁型反时限继电保护装置的这些企业大多在经济市场化的浪潮中艰难生存,资金非常紧张。虽然对改造继电保护装置有主观的意愿,但是需投入的改造费用却不能落实到位。所以我们只有另辟蹊径,用最小的投入满足客户与供电企业的继电保护配合问题。以下是亨通精密铸造有限公司继电保护改造实例。The use of electromagnetic inverse time relay protection device of most of the enterprises in the market economy tide survive, money is very tight. Although there is a willingness on the transformation of relay protection device, but the cost of inputs can not be put in place. So we only path, meet the relay protection of power supply enterprise customers and cooperation with minimal input. The following is the relay example Hengtong Precision Casting Co., ltd.. 二、现状调查及存在问题Two, current situation and existing problems 1.亨通精密铸造有限公司平均每年发生越级跳闸事故4次,而且给该厂供电专线上还T接有其他3家电力大客户。屡次越级跳闸事故的梨苗发