On-line detection device for closing time of steam turbine valve

The utility model discloses a steam turbine valve closing time on-line detection device which comprises an on-line waveform recorder and a signal input wiring terminal, the on-line waveform recorder records collected signal data in real time and generates a waveform file, and meanwhile, the waveform data is sent to a plant-level monitoring information system through a network interface; the signal input wiring terminal collects a steam turbine tripping instruction signal and a steam turbine valve position feedback signal in real time and sends the collected signals and the collection time to the online waveform recorder. According to the utility model, a high-precision on-line data acquisition technology is adopted, a steam turbine tripping signal of steam turbine valve closing time, a fed-back valve opening and closing signal and a valve opening analog quantity signal are acquired in real time, the signals are automatically recorded, an electronic record is formed, and the electronic record is reported to a