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The East is Red Power Generator East leg of Accident Analysis

2 generator model TSW173/54-8, rated voltage 6.3kV. East leg of the second station and the East share a check dam, the East Second Station 1 × 10000kW vertical unit in September 1997 put into operation, the East leg of the season into power, the unit in standby mode in the dry season. In mid-May 2001 arrival of the first flooding, the East No. 2 machine in a station at 3:25 on May 16 opened, and contains 2000kW load operation,[link widoczny dla zalogowanych], 4:25 generator differential protection, generator inside a white smoke risk out. An accident investigation of the disintegration of generator No. 2, it was discovered serious damage to the stator winding insulation. The analysis and appraisal, need to be replaced on the generator stator winding handle. The accident caused a direct economic loss of 17 million. 2 cause of the accident for the season, East Point power station, the unit is ready for a long time in the dry season, wet stator winding insulation, insulation resistance below standard, the unit did not start the equipment before the insulation inspection, receiving the start command, rush to open the unit and set to run at full capacity, resulting in Units and the stator windings after 1h by the breakdown of serious accidents. Automatically turn off other three locations. Valve with pressure form the pipeline for 0.4MPa magnetic-assisted electric contact pressure gauge, the total cooling water circulation unit, the interrupt signal is normally open contact leads from the table, return to Unit 1 LCU screen PLC. On-site cooling water solenoid valve in the automatic position,[link widoczny dla zalogowanych], the sound pipe water, cooling water is turned off. The contradiction is that there are instructions about pressure table 0.1MPa, 0.09MPa tuning pointer position (previously 0.17MPa or so), it is clear the table normally open contact pressure has been closed, PLC is now collected by the cooling water conduction error signal. Electrical contacts in the small hydro automation components is relatively backward, its accuracy is low, contact easily stuck, damaged, 3 lessons learned after the accident, in order to improve power production safety awareness of employees, and strengthen the following management measures. 1) The generator shut down more than 10 days,[link widoczny dla zalogowanych], the unit must be used before the start of shaking table measurements 2500V phase stator winding, relative to the insulation resistance, insulation resistance of stator insulation condition in the heat value of not less than volts per dry 1MI2. And with previous measurements (converted to 75 ℃, the insulation resistance value) compared to no less than the previous 1 / 3 (this is good or bad judgments based primarily on Generator Insulation); measuring the absorption ratio should be insulated generator not less than 1.3 (R6os/Rl5s ≥ 1.3), otherwise the generator insulation damp; generator rotor winding insulation resistance 500V shake table test, the minimum insulation resistance of not less than 0.5MQ. 2) detection of generator winding insulation value of insulation resistance does not meet the security, the analysis determined that the moisture caused the generator must be dry. Natural idling air-cooled unit commonly used method, followed by drying or short circuit can be used to direct current through drying. 3) strengthen job training, to enhance electrical safety education, to develop \A:: a a a a a a T a '『its low reliability. Pressure changes resulting in frequent swing instruction pointer, a long time,[link widoczny dla zalogowanych], when the water break, the pointer back to 0 position is difficult, because the pipeline will be setting the table pointer to the vibration of the body deviates from the original setting value. Hydraulic table to re-zero, setting a pointer to re-tuning to 0.17MPa. Thus, PLC appears on the cooling water unit interrupt signal, static display lights. Since then, no similar failure occurred. In addition, the governor shaft to completely handle the overhaul, cooling water pressure is best to replace the table, high precision, long life inlet pressure transmitter or pressure switch. ● · 45 ·
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