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After the main valve of the turbine is closed, the grid-connected turbogenerator operates as a synchronous motor, absorbing active power and dragging the turbine to rotate, thus generating reactive power for the system. Because the main valve of the steam turbine has been closed, the steam turbine tail blade and residual steam friction, forming explosion damage, overheating damage after long-term operation. Gas and water turbines also mainly damage the prime mover. Generator reverse power protection mainly protects the turbine from damage.