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Turbine-generator shaft system torsional vibration protection method and device

A technology for torsional vibration of generator sets and shafting, applied to emergency protection circuit devices, emergency protection devices for automatic disconnection, circuit devices, etc.

Active Publication Date: 2015-07-29
BEIJING SIFANG JIBAO AUTOMATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the existing shafting torsional vibration technical solutions, the patent "US4,862,749Shaft torsional vibration monitor for a multi-mass rotary system" and the patent "US3,934,459Torque monitoring system for rotating shaft" describe the shafting torsional vibration of the unit monitoring program, but does not involve protection programs and criteria

Method used

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  • Turbine-generator shaft system torsional vibration protection method and device
  • Turbine-generator shaft system torsional vibration protection method and device
  • Turbine-generator shaft system torsional vibration protection method and device

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Embodiment Construction

[0054] The present invention will be described in further detail below according to the drawings and embodiments.

[0055] The present invention proposes a method for protecting the shafting torsional vibration of a generator set, the method includes the following steps, such as figure 1 Shown:

[0056] Collect the variation of angular velocity at the shaft end of the generating set; apply the non-contact sensor to sense the pulse signal generated by the gear rotating with the shaft. When each tooth passes the sensor, a pulse signal is generated. When the rotor rotates at a constant speed, the position of the pulse train reflects the arrangement position of each tooth on the circumference of the gear. The output of the sensor is a uniform pulse wave. When the rotor vibrates, the position of each pulse changes, and the vibration makes the phase shift of the pulse signal, and the output is a pulse wave with alternating density and density. By extracting this phase shift, a s...

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Abstract

Provided is a turbine-generator shaft system torsional vibration protection method and device. The method includes the steps of collecting shaft system torsional vibration signals, determining the threat situation of the torsional vibration on the safety of units through a fatigue inverse time limit criterion (protection criterion I), a static instability criterion (protection criterion II) and a quick operation criterion (protection criterion III), and performing protection trip and warning to avoid more damage of the torsional vibration to a turbine-generator shaft system. The torsional vibration protection device comprises a speed sensor, a pulse input module (PI), a main control module (CM), a digital input module (DI), an analog input module (AI), a digital output module (DO) and a power supply module (POW). The speed sensor is connected to the pulse input module of the protection device through a cable. The protection device is in communication with a human machine interface (HMI) of a master station through Ethernet.

Description

technical field [0001] The invention belongs to the field of protection for sub-synchronous oscillations of turbogenerator sets and nuclear power sets in power systems and large power plants, and in particular relates to torsional vibration of shafting under sub-synchronous oscillation (Sub-Synchronous Oscillation, hereinafter referred to as SSO) of generator sets Protection method and protection device. Background technique [0002] In the existing technology, series capacitance compensation of transmission lines, DC transmission, improper installation of power system stabilizers, feedback effects of generator excitation system, thyristor control system, electro-hydraulic regulation system, etc., may induce, Leading to sub-SSO phenomenon. The rotors of steam turbines and generators have large inertia, are very sensitive to the low-order torsional modes of the shafting itself, and are in a state of low circumference and high stress. When electromechanical disturbance occur...

Claims

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Application Information

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IPC IPC(8): H02H7/06H02H3/04
CPCF01D21/14F01D21/02F05D2270/114F05D2270/304F05D2270/331F05D2270/332G01H1/10
Inventor 杨奇逊张涛焦邵华刘全郑巍常富杰梁新艳王莹莹钱华东
Owner BEIJING SIFANG JIBAO AUTOMATION
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