水泵跳闸原因分析

在使用水泵的过程当中，有时会碰到一合闸即跳闸的状况，而针对这一现象，我们对其进行了故障与原因分析。
故障现象：发电厂125mw机组自投产以来，水泵偶尔会发生一合闸即跳闸的问题，并无_信号继电器掉牌。在排除了开关机构故障后，按常规方法检查电缆、二次回路接线和各继电器及其定值都正常，再次启动又往往成功。后怀疑是dcs系统软故障造成的，但改在控制盘上操作，仍会出现此现象。另一方面，疑为是因dcs系统软故障的问题，但如若改为控制盘上操作，则又会出现此现象。
为弄清此故障原因，对其开关合闸中出现的各表计进行了变化统计，从而来确认跳闸的原因。试验其中电压表监视微机跳闸回路，毫安表监视差动继电器1cj、2cj动作情况，电流表监视热工保护回路。接好表计后，启动给水泵，经过一段时间的试验，终于有一次水泵一启动即跳闸，同时观察到毫安表的指针偏转了一下，其它监视表计没有反应，新换上的xjl-0025/31型集成块式信号继电器1xj亦动作掉牌，表明是由差动保护动作导致跳闸。
In the course of using the pump, sometimes run into a situation of closing the trip, while the response to this phenomenon, we had trouble with the reasons for its analysis.
Failure phenomenon: power plant 125mw unit since production began pumping occurs occasionally tripping a switch on the issue, there is no signal relay swap cards. Ruled out the switch body in the breakdown, according to conventional methods of checking cables, secondary circuit wiring and the relay and its value are normal, often successful start again. Dcs system software after fault suspected cause, but the change in the control panel to operate, this phenomenon will occur. On the other hand, suspected because of dcs system software failure, but Should the control panel to operate, then this phenomenon will occur.
In order to clarify the reasons for this failure, its switch closing tables appear in statistical terms were changed, so to confirm the reason for trip. Test in which voltage meter to monitor loop trip computer, monitor differential relay mA table 1cj, 2cj action case, current meter to monitor the thermal protection circuit. Connect the meter, start to pump, after a period of testing, finally have a pump for a start that trip at the same time observed mA table pointer deflection a little, other surveillance meter does not respond, replace the xjl-new 0025/31 type Manifold signal relay 1xj also move out card that is caused by the differential protection trip.