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Shafting torsional oscillation protecting equipment of steam turbo-generator set

A technology for turbogenerator sets and protection devices, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection devices for automatic disconnection, etc., and can solve the problem of not providing torsional vibration protection and control equipment for the shafting of the unit

Active Publication Date: 2009-10-21
NORTH UNITED POWER CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

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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Effect test

Embodiment Construction

[0068] The present invention will be described in further detail below according to the drawings and embodiments.

[0069] The working process of this device is: collect the angular velocity variation 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 mode signals at the same time the magnitude of . According to the sampling value of each synchronous modal signal, the shafting fatigue is calculated, and at the same time, according to the convergence and divergence of the amplitude of each synchronous modal signal and the damage of the shafting system, the shafting fatigue is over-determined or exists. In the case of certain shafting fatigue, the torsional vibration of the shafting is divergent as the criterion, and the action signal is judged and output, and the line or generator is jumped to ...

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Abstract

The invention discloses a torsional vibration protection device for protecting the safety of the shaft system of a steam turbine generator set. Including: the pulse input module (PI) that detects the angular velocity variation of the machine end and performs filtering processing, detects and demodulates the SSO signal of each synchronous mode, and obtains the amplitude of each synchronous mode signal; the main The control module (CM) calculates the fatigue of the shaft system according to the sampling value of each synchronous modal signal, and at the same time judges the amplitude of each synchronous modal signal and the damage of the shaft system to obtain the action signal; output the tripping action and digital output modules (DO) for alarm signals. The device collects and demodulates the SSO signal, calculates the fatigue damage value and the fatigue damage trend value caused to the shafting in real time, and uses it as a criterion to disconnect the steam turbine generator set from the power grid to avoid torsional vibration damage to the steam turbine. Generator set shafting causes more damage.

Description

technical field [0001] The invention relates to electric power systems and large-scale power plants, which require protection applications for subsynchronous oscillations of steam turbine generator sets and hydroelectric generator sets, and in particular to a shafting torsional vibration protection device under subsynchronous oscillations of generator sets. Background technique [0002] Large-scale thermal turbine technology is one of the key equipment of major equipment in my country. The shafting of high-power units has the characteristics of light weight and flexibility, multiple supports, large span, and high power density. The utilization factor of generator materials is improved, and the cross-sectional power of the shafting The density is relatively increased, the lengthening of the shaft system reduces the torsional stiffness, the natural frequency spectrum of the shaft system is relatively dense, and the energy induced by vibration is low; at the same time, the power ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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