Shafting torsional oscillation protecting equipment of steam turbo-generator set

Abstract

The invention discloses a torsional oscillation protective device used for protecting the safety of shafting of a turbo generator set, which comprise: a pulse quantity input module (PI) used for detecting angular velocity change of ends of a machine and performing wave filtering treatment, detecting and demodulating various subsynchronous mode SSO signals and obtaining amplitudes of the various subsynchronous mode signals; a master module (CM) used for calculating endurance range of the shafting according to the various subsynchronous mode signals, and making judgment to the damage of the shafting according to the amplitudes of the various subsynchronous mode signals and obtaining actuating signals; and a digital quantity output module (DO) used for output tripping operations and guard signals. The device acquires the demodulated SSO signals, obtains a fatigue damage value and a fatigue damage tendency value of the shafting through real-time calculation as criterions so as to disconnect the turbo generator set from an electricity grid, thereby preventing torsional oscillation from further damaging the shafting of the turbo generator set.

Description

Technical field [0001] The invention relates to power systems, large power plants, and protection applications that require subsynchronous oscillations of steam turbine generator sets and hydraulic generator sets, and in particular to a shaft system torsional vibration protection device under subsynchronous oscillations of generator sets. Background technique [0002] Large-scale thermal turbine unit technology is one of the key equipment of China’s major equipment. The shafting of high-power units has the characteristics of light weight, flexibility, multiple supports, large spans, and high power density. The utilization factor of generator materials is improved, and the section power of shafting is improved. The relative increase in density, the lengthening of the shafting system reduces the torsional stiffness, the natural frequency spectrum of the shafting system is relatively dense, and the energy of induced vibration is relatively low; at the same time, the power grid is al...

AI Technical Summary

Problems solved by technology

At present, there is no domestic manufacturer that provides torsional vibration protection and control equipment for shafting of the unit

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