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Torsional Vibration Protection Method and Device for Turbine Generator Shaft System

A shafting torsional vibration and generator set technology, which is applied to emergency protection circuit devices, emergency protection devices with automatic disconnection, circuit devices, etc., can solve problems that do not involve protection schemes and criteria

Active Publication Date: 2018-04-03
BEIJING SIFANG JIBAO AUTOMATION
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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 amulti-mass rotary system" and the patent "US3,934,459Torque monitoring system forrotating shaft" describe the monitoring of the shafting torsional vibration of the unit program, but does not involve protection programs and criteria

Method used

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  • Torsional Vibration Protection Method and Device for Turbine Generator Shaft System
  • Torsional Vibration Protection Method and Device for Turbine Generator Shaft System
  • Torsional Vibration Protection Method and Device for Turbine Generator Shaft System

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Embodiment Construction

[0054] Hereinafter, the present invention will be further described in detail based on the drawings and embodiments.

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

[0056] Collect the angular velocity change of the shafting machine end of the generator 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 pulse train position reflects the arrangement position of the teeth on the gear circumference. The output of the sensor is a uniform pulse wave. When the rotor vibrates, the position of each pulse changes, and the vibration causes the pulse signal to undergo a phase shift, and the output is a sparse and dense pulse wave. Extracting this phase displacement, we get a set of sampled value...

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Abstract

A shafting torsional vibration protection method and protection device for a steam turbine generator set. By collecting the torsional vibration signal of the shaft system, the fatigue inverse time limit criterion (protection criterion 1), static instability criterion (protection criterion 2), and fast action criterion (protection criterion 3) are used to judge the safety of the unit due to torsional vibration In the threat situation, protection tripping and alarm are performed to avoid torsional vibration from causing greater damage to the shafting of the generator set. The torsional vibration protection device includes: speed sensor, pulse input module (PI), main control module (CM), digital input module (DI), analog input module (AI), digital output module (DO), power supply Module (POW). The speed sensor is connected to the pulse quantity input module of the protection device with an application cable, and the protection device communicates with the HMI of the master station through Ethernet.

Description

Technical field [0001] The invention belongs to the field of protection of electric power systems and large power plants that require sub-synchronous oscillations of steam turbine generator sets and nuclear power sets, and particularly relates to a shaft system torsional vibration under sub-synchronous oscillation (Sub-Synchronous Oscillation, hereinafter referred to as SSO) of a generator set Protection method and protection device. Background technique [0002] In the prior art, series capacitance compensation of transmission lines, DC transmission, improper installation of power system stabilizers, feedback effects of generator excitation systems, thyristor control systems, and electro-hydraulic regulation systems may all induce, Lead to secondary SSO phenomenon. The rotors of steam turbines and generators have large inertia, and are very sensitive to the low-order torsional modes of the shaft system itself, and present a low-cycle high-stress state. When an electromechanica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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