Cause Analysis on Steam Turbine Valve Control Misoperation during Grid Instantaneous Faults

doi:10.11930/j.issn.1004-9649.2014.5.25.3

Abstract

Abstract: In this paper, several steam turbine fast valve control misoperation events caused by grid instantaneous failures are introduced. In combination with the grid fault record data, several power transmitters of different types are tested. The result shows that when the input signal changes rapidly, distortion happens in the output value of some power transmitters with the distortion direction and amplitude relevant to the phase of faults, fault time, power transmitter connection type and the manufacturer such that the grid fault information may be amplified, which is the root cause of the fast valve control misoperation events. Based on the test results, some suggestions are put forward on the selection and application of power transmitters.

Key words: steam turbine, fast valve control, transient grid interruption (KU), power load unbalance (PLU), power transmitter

CLC Number:

TK264.2

ZHANG Bao, YANG Tao, XIANG Jin, FAN Yin-long, GU Zheng-hao, XU Feng, LIU Xiao-sheng. Cause Analysis on Steam Turbine Valve Control Misoperation during Grid Instantaneous Faults[J]. Electric Power, 2014, 47(5): 25-28.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2014.5.25.3

https://www.electricpower.com.cn/EN/Y2014/V47/I5/25

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Cause Analysis on Steam Turbine Valve Control Misoperation during Grid Instantaneous Faults

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