1. Generator operation without excitation is prohibited.

2. When the generator is operating at high power, the automatic excitation regulator must be set to automatic mode. If the excitation regulator is in manual mode, the power factor must be controlled, and it should generally be within 0.95 phase lag to prevent generator loss of synchronization.

3. Generators that have not undergone over-phase testing are prohibited from over-phase operation if their over-phase capability is unclear. Even if they have over-phase operation capability, over-phase operation is prohibited if the automatic excitation regulator is not activated. During over-phase operation, the automatic excitation regulator must have a low excitation limit function, and the low excitation limit protection must be reliably activated.

4. During over-phase operation, monitoring of the generator body and operating parameters should be strengthened to prevent the generator core temperature from becoming too high.

5. Prevent generator operation with single-phase failure and asymmetrical operation. Strictly control the generator's negative sequence current to prevent the generator rotor from burning out due to prolonged excessive negative sequence current. Strictly follow the generator emergency stop procedure; stop operation immediately if necessary, and take care to avoid damage to the generator due to delay.

6. Prevent explosions and fires in the generator's hydrogen system.

7. During operation, the setting off of fireworks and firecrackers is strictly prohibited within the hydrogen-cooled generator and its hydrogen system area. If open flame work or maintenance testing is required, hydrogen leaks must be detected beforehand, gas samples must be taken for analysis, and the gas mixing ratio must be confirmed to be within a safe range. A hot work permit must be applied for before open flame work can be carried out. After approval, work can be conducted under the supervision of designated personnel. If the above work takes more than 4 hours, the above tests and laboratory work must be repeated.

8. Flammable and explosive materials must not be placed near the operating generator, and the grounding wire of the welding machine must not overlap with the hydrogen charging pipeline.

9. When the generator is running, the reliable operation of the exhaust fan should be checked, and samples should be taken regularly from the exhaust fan outlet and the main oil tank to monitor whether the hydrogen content exceeds the specified value (2%). If it exceeds the specified value, the cause should be identified and eliminated.

10. When the sealing oil pump is working, the standby switch should be normal, and tests should be conducted and records recorded regularly.

11. If the operator notices an abnormal increase in hydrogen supply, they should immediately contact relevant personnel to locate and eliminate the leak.

12. The purity of hydrogen inside the machine should be maintained above 98%, and the oxygen content should be less than 1.2%. If these limits are exceeded, the hydrogen should be purged and replenished, then filled with pure hydrogen until the hydrogen purity reaches the acceptable standard.