当焦化发电机组启动到额定转速后不能升压时，检查励磁回路接线是否正确，有无断线和接触不良，电刷位置是否正确，接触是否良好，励磁电压表有指示，可以达到很大的值，说明励磁机磁场绕组的极性不能接反，剩磁也不会消失，因为我们拆开励磁机转子，用铁皮包起来防止剩磁不会消失，电刷按原位安装，其表面也磨成弧形，杜绝了电刷接触不良的可能。

When the coking generator unit cannot boost voltage after starting to the rated speed, check whether the excitation circuit wiring is correct, whether there is disconnection and poor contact, whether the brush position is correct, whether the contact is good, and the excitation voltmeter has an indication, which can reach a large value, indicating that the polarity of the exciter field winding cannot be reversed, and the residual magnetism will not disappear, because we disassemble the exciter rotor and wrap it with iron sheet to prevent the residual magnetism from disappearing, The brush is installed in situ, and its surface is also ground into an arc, eliminating the possibility of poor contact of the brush.

在对电气设备进行多方面检查的同时，在其他电站相关电气技术人员的大力协助下，用万用表测得发电机转子回路电压只有几伏。仔细分析后认为是转子电路断路。因此决定检查励磁电路。更换备用多股铜芯线时，发现励磁开关闭合，用万用表测试上下引出线，有一对触点被堵住。

While checking the electrical equipment in many aspects, with the great assistance of relevant electrical technicians of other power stations, the generator rotor circuit voltage measured with a multimeter was only a few volts. After careful analysis, it is considered that the rotor circuit is open. Therefore, it is decided to focus on checking the excitation circuit. When replacing the spare multi strand copper core wire, it was found that the excitation switch was closed, the upper and lower outgoing lines were tested with a multimeter, and a pair of contacts were blocked.

立即取下灭弧罩，励磁开关中的移相触头处于断开位置。仔细一看，原来是胶木棒断了。即使励磁开关处于闭合状态，其自由脱扣机构也不能随主轴转动。拉杆与胶木拉开时，励磁开关的动、合触点不闭合。

Remove the arc extinguishing cover immediately, and the phase-shifting contact in the excitation switch is in the off position. On closer inspection, it turned out that the bakelite stick was broken. Even if the excitation switch is closed, its free tripping mechanism cannot rotate with the main shaft. When the pull rod and bakelite are pulled apart, the dynamic and closing contacts of the excitation switch are not closed.

焦化发电机组厂家认为正是由于动触头相断开，转子放电电阻和磁场放电电阻没有接通，励磁机内的磁场电位越来越强，造成励磁绕组过电压。励磁机，导致电缆短路，冒烟和燃烧。，也因为发电机转子电路被堵死，转子绕组没有电流通过，发电机无法建立磁场，使发电机的定子无法建立电压。至此，更换备件后，开机及运行均正常。

The manufacturer of coking generator set believes that it is precisely because the moving contact phase is disconnected, the rotor discharge resistance and magnetic field discharge resistance are not connected, and the magnetic field potential in the exciter is becoming stronger and stronger, resulting in overvoltage of the excitation winding. Exciter, resulting in cable short circuit, smoke and combustion., Also, because the generator rotor circuit is blocked, there is no current through the rotor winding, and the generator cannot establish a magnetic field, so that the generator stator cannot establish a voltage. So far, after replacing the spare parts, the startup and operation are normal.

找问题的时候一定要细心、细心，不能漏掉一些不起眼的细节，否则很难找到问题所在。如出现上述问题，应拆下励磁开关的灭弧罩，及时发现问题。以上就是今天为大家分享的关于问题的相关内容，希望对大家能有所帮助，想要了解更多内容可以电话联系我们或者关注我们的网站//www.gz-yanye.com。

When looking for problems, you must be careful and careful. You can't miss some inconspicuous details, otherwise it's difficult to find the problem. In case of the above problems, remove the arc extinguishing cover of the excitation switch to find the problems in time. The above is the relevant content about the problem shared for you today. I hope it can help you. If you want to know more, you can contact us by phone or follow our website //www.gz-yanye.com 。