Shafting torsional oscillation protecting equipment of steam turbo-generator set

A technology for a steam turbine generator set and a protection device, which is applied in the direction of emergency protection circuit device, circuit device, and automatic disconnection emergency protection device, etc., can solve the problem of not providing the shaft system torsional vibration protection and control equipment of the unit and so on.

Active Publication Date: 2008-07-16
NORTH UNITED POWER CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no domestic manufacturer that provides torsiona

Method used

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  • Shafting torsional oscillation protecting equipment of steam turbo-generator set
  • Shafting torsional oscillation protecting equipment of steam turbo-generator set
  • Shafting torsional oscillation protecting equipment of steam turbo-generator set

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Experimental program
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Embodiment Construction

[0068] Hereinafter, the present invention will be further described in detail based on the drawings and embodiments.

[0069] The working process of this device is: collect the angular velocity change of the machine end, demodulate the instantaneous value of the angular velocity change of each mode of the machine end through modal filtering, obtain the oscillation components of each torsional vibration mode, and obtain the synchronous modal signals of each sub-mode at the same time. The amplitude. Calculate shaft fatigue according to the sampling value of each sub-synchronous modal signal, and judge the damage of the shaft system according to the convergence and divergence of the amplitude of each sub-synchronous modal signal, and use the over-determined value or existence of shaft fatigue In the case of a certain shaft system fatigue, the torsional vibration of the shaft system shows a trend of divergence as the criterion. The action signal is determined and output, and the line ...

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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...

Claims

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Application Information

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IPC IPC(8): H02H7/06H02H5/00
Inventor 李国宝郭锡玖张涛李英伟谢小荣李元盛焦邵华常富杰
Owner NORTH UNITED POWER CO LTD
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