A method and device for measuring the displacement of the main valve core of a governor with anti-electromagnetic interference and anti-zero drift

Abstract

The invention relates to a device for measuring the displacement of a main distributing valve core of an anti-electromagnetic interference and anti-zero drift governor. The device comprises a main distributing valve sleeve, the main distributing valve core, a main distributing displacement upper measuring circular table, a main distributing displacement lower measuring circular table, a main distributing displacement measuring bracket, an upper main distributing displacement sensor probe and a lower main distributing displacement sensor probe. The main distributing displacement measuring bracket is arranged on the end cover of the main distributing valve sleeve. The main distributing displacement upper measuring circular table and the main distributing displacement lower measuring circulartable are fixedly arranged outside the main distributing valve sleeve on the main distributing valve core. Through core holes which match the outer part of the main distributing valve sleeve on the main distributing valve core are arranged in the axial center of the main distributing displacement upper measuring circular table and the main distributing displacement lower measuring circular table.According to the invention, the influence of a temperature drifting effect and an electromagnetic interference signal during the measurement process of the displacement signal of the main distributing valve core can be eliminated, and the displacement signal of the main distributing valve core can be accurately measured and collected.

Description

technical field [0001] The invention discloses a method and device for measuring the displacement of a main matching spool of a speed governor with anti-electromagnetic interference and zero-drift, and relates to the technical field of hydroelectric generating set operation. Background technique [0002] The measurement of the displacement of the main distribution spool is an important part of the stable operation of the hydro-generator set. Whether the displacement of the main distribution spool can be accurately measured directly affects whether the guide vanes of the unit can be controlled normally and accurately. At present, the governor of a hydropower station generally uses a single sensor to measure the displacement of the main distribution spool. At present, a kind of governor main distribution spool position measurement device widely used in giant hydroelectric generating units is as follows: figure 1 As shown, this measurement method and device has the following de...

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Problems solved by technology

[0003] The purpose of the present invention is to provide an anti-electromagnetic interference and anti-zero-drift speed governor main The method and device for measuring the displacement of the spool, which converts the axial displacement of the main distribution spool into the radial displacement change in the opposite direction through the main distribution displacement measuring round table installed in opposite directions, so as to pass the two model batches The same main distribution sensor probes respectively measure the distance change from the end face of the probe head to the corresponding main distribution displacement measuring round platform, and then use different core wires in the same cable to transmit the two sensor signals to the PLC controller acquisition module, and finally through the PLC control The sensor uses a differential method to process the collected sensor signals, eliminates the influence of external electromagnetic interference and temperature drift of the sensor, and accurately measures the displacement of the main valve core

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