当操作者发电机组碳刷打火严重、破碎、刷辫发热变红等不立即处理有可能引起环火的情况，运行人员应立即更换，更换时应注意以下事项和方法：

When the operator does not immediately deal with the situation that may cause ring fire, such as serious ignition, breakage, heating and redness of the brush braid of the generator set, the operator shall replace it immediately. During replacement, pay attention to the following matters and methods:

1.更换工作必须由两人且由主值班员亲自进行更换。

1. The replacement work must be carried out by two people and the main attendant in person.

2.更换时，工作人员应穿工作服，紧扣袖口、站在绝缘垫上进行，禁止穿短袖衫或将衣袖卷起，女工应将长发卷入安全帽内。

2. During replacement, the staff shall wear work clothes, fasten the cuffs and stand on the insulating pad. It is forbidden to wear short sleeved shirts or roll up the sleeves. The female workers shall draw long hair into the safety helmet.

3.禁止双手同时接触两极或一极与接地部分，不允许两人同时进行工作。

3. It is forbidden to touch two poles or one pole and the grounding part at the same time, and two people are not allowed to work at the same time.

4.将预更换的碳刷从刷握里提出，握在手中，然后旋松刷辫螺丝、取下碳刷。

4. Lift the pre replaced carbon brush out of the brush holder and hold it in your hand, then unscrew the brush braid screw and remove the carbon brush.

5.将研磨好的碳刷握在手中，上紧刷辫螺丝，然后将碳刷用恒压器压入刷握。

5. Hold the ground carbon brush in your hand, tighten the brush braid screw, and then press the carbon brush into the brush holder with a constant voltage device.

6.一般情况下在同一时间内每个刷架只允许更换1-2个碳刷，换上的碳刷事先要研磨好，且新旧碳刷型号必须一致。

6. Generally, only 1-2 carbon brushes are allowed to be replaced for each brush holder at the same time. The replaced carbon brushes must be ground in advance, and the models of the old and new carbon brushes must be the same.

7.更换后应详细记录。

7. Detailed records shall be made after replacement.