Generator tripping refers to the tripping of the generator output switch, i.e. differential protection refers to the protection of the interphase or interturn windings of the generator stator coil!
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In case of emergency. the safety device malfunctions, and if the main oil switch does not operate, the turbine blades will burn out due to heat loss caused by blast when there is no steam.
Single-phase grounding of the stator winding is dangerous for the generator. Single-phase grounding of the stator winding is a common generator fault, which can cause the following problems:
Heat generated by earth current: When single-phase grounding of the stator winding is When the stator winding occurs, the grounding current generates heat through the winding. The winding temperature increases, which can causea fire.
Destruction of winding insulation: A single-phase earth fault can damage the winding insulation, causing damage to other two-phase windings, thereby affecting the normal operation of the generator.
Magnetization of the rotor shaft: A single-phase ground fault can cause the rotor shaft to become magnetized, making the generator unstable and even produce vibration and noise.
In order to monitor the single-phase grounding of the stator winding, the following methods can be used:
Insulation monitoring: Regularly monitor the insulation of the generator stator winding if the. insulation resistance is found to be reduced or abnormal, you should treat it promptly.
Current monitoring: Install a current transformer on the generator stator winding to monitor changes in stator current in real time. If a currentabnormal is detected, this may be a sign of a single-phase earth fault. .
Vibration monitoring: Install a vibration sensor on the generator to monitor generator vibrations in real time. If abnormal vibrations are detected, this may be a sign of a single-phase ground fault.