Discuss the treatment principles for a drop in condenser vacuum.

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(1) If a drop in vacuum is detected, it should be confirmed by comparing it with the exhaust steam temperature. The cause must be identified promptly, appropriate measures taken to address it, and the situation reported to higher-level management. (2) When the vacuum level drops, the backup vacuum pump should be started. If the vacuum continues to decline even after reaching the load-reduction value, the load should be reduced by an amount corresponding to the degree of vacuum drop until the load is reduced to zero. (3) If the treatment is ineffective and the unit load is reduced to zero yet the vacuum cannot be restored, the machine should be shut down by tripping the breaker. (4) When the vacuum level drops, attention should be paid to the operation of the steam pump; if necessary, switch to electric pump operation. (5) As the vacuum decreases, attention should be paid to changes in the exhaust temperature. (6) If the vacuum drops rapidly and reaches the shutdown value during operation, the protection will trigger a trip of the unit; otherwise, manual shutdown should be carried out. (7) During a shutdown due to low vacuum, the high and low pressure bypasses should be promptly disconnected and closed, as well as the main and reheat steam pipes leading to the condenser drain; it is prohibited to activate the secondary bypass from the boiler to the condenser. (8) Strengthen the monitoring of the temperature and vibration of each bearing in the unit.