What is the reason for the grounding of the Cummins generator stator? So what measures should we take to deal with the stator grounding situation? Let me share with you:
Phenomenon:
1. On the btg panel, "the generator-transformer group protection a screen trips", "the generator-transformer group protection b-screen trips" light word alarm flips, the generator stator voltmeter, stator ammeter, and excitation ammeter indicate a sudden drop to zero.
2. The main valve of the turbine is closed.
3. The ecs system sends an alarm for the transformer group. On the alarm screen 2, "generator stator grounding trips", and on the first alarm screen for the ecs system, the "transformer group fault recording starts" and other soft photonic cards are issued.
4. When the protection action generator trips, the indication of the relevant voltage, current and power meters is zero, the indication of the frequency meter is abnormal, and all trip switches flash green.
5. Quick cutting device action.
reason:
1. The local long-term overheating of the Cummins generator causes insulation aging.
2. Cummins generator enters oil, which corrodes the insulation.
3. The air humidity of Cummins generator is large, which makes the insulation damp.
deal with:
1. When the Cummins generator causes the fundamental wave protection action in the grounding protection to trip the generator-transformer group, it shall be treated as the generator trip.
2. When the fundamental wave protection of the grounding protection does not act, if it is judged that the generator stator is indeed grounded, it should be quickly disconnected and stopped.
3. When the third harmonic protection action of the stator grounding protection is signaled and the fundamental wave protection of the action is not activated, the generator body and the connected primary circuit should be checked in detail, and the generator leak detector should be checked for water accumulation. If there is any fault in the generator, make a comprehensive judgment and analysis on the above inspection results to confirm whether the stator is grounded.
4. When searching for the grounding of the Cummins generator stator, the inspector should be notified immediately to check. If the generator is internally grounded, it should be stopped immediately.
Phenomenon:
1. On the btg panel, "the generator-transformer group protection a screen trips", "the generator-transformer group protection b-screen trips" light word alarm flips, the generator stator voltmeter, stator ammeter, and excitation ammeter indicate a sudden drop to zero.
2. The main valve of the turbine is closed.
3. The ecs system sends an alarm for the transformer group. On the alarm screen 2, "generator stator grounding trips", and on the first alarm screen for the ecs system, the "transformer group fault recording starts" and other soft photonic cards are issued.
4. When the protection action generator trips, the indication of the relevant voltage, current and power meters is zero, the indication of the frequency meter is abnormal, and all trip switches flash green.
5. Quick cutting device action.
reason:
1. The local long-term overheating of the Cummins generator causes insulation aging.
2. Cummins generator enters oil, which corrodes the insulation.
3. The air humidity of Cummins generator is large, which makes the insulation damp.
deal with:
1. When the Cummins generator causes the fundamental wave protection action in the grounding protection to trip the generator-transformer group, it shall be treated as the generator trip.
2. When the fundamental wave protection of the grounding protection does not act, if it is judged that the generator stator is indeed grounded, it should be quickly disconnected and stopped.
3. When the third harmonic protection action of the stator grounding protection is signaled and the fundamental wave protection of the action is not activated, the generator body and the connected primary circuit should be checked in detail, and the generator leak detector should be checked for water accumulation. If there is any fault in the generator, make a comprehensive judgment and analysis on the above inspection results to confirm whether the stator is grounded.
4. When searching for the grounding of the Cummins generator stator, the inspector should be notified immediately to check. If the generator is internally grounded, it should be stopped immediately.
5. When it is found that there is a ground fault in the stator circuit of the Cummins generator, and the generator-transformer unit needs to be transferred to the maintenance state, the generator-transformer unit will be transferred to the maintenance state and then handed over for maintenance.
