Test system

Abstract

The application discloses a test system comprising a frequency converter, a driving motor, a generator, a tachometer and a main control computer; the frequency converter is used for driving the driving motor; the driving motor is used for driving the generator to rotate; the tachometer is used for reading the actual rotating speed of the generator; the main control computer is respectively connected with the frequency converter and the tachometer and is used for setting the set rotating speed of the generator by adjusting the output frequency of the frequency converter, acquiring the actual rotating speed of the generator read by the tachometer, calculating a difference value between the actual rotating speed and the set rotating speed, and keeping the actual rotating speed of the generator to be stable according to the calculated difference value and a preset control algorithm. According to the test system in the application, the set rotating speed of the generator is set by adjustingthe output frequency of the frequency converter, and the actual rotating speed of the generator is kept stable, so that the underground actual working state can be simulated through the rotating speed test of the generator, thereby improving the test efficiency of the generator, reducing the randomness of manual test, and improving the accuracy of the test data of the generator and the integrityof performance test.

Description

technical field [0001] The present application relates to but not limited to the technical field of downhole instrument performance testing, and in particular relates to a testing system for a generator and its power supply board. Background technique [0002] In the process of petroleum directional drilling, all downhole instruments need to be powered. Due to the limitation of the production environment, downhole instruments are generally powered by batteries or mud turbine generators. Since the power consumption of downhole drilling tools is usually large, and the mud turbine generator can provide continuous power, the mud turbine generator has become the main power supply equipment for downhole tools. The working environment of the turbine generator is very harsh, the mud flow rate changes greatly, the magnetic ring speed range can reach 0-6000 revolutions per minute (Revolutions Per Minute, rpm), the downhole working conditions are complex and changeable, and the downhol...

AI Technical Summary

Problems solved by technology

Existing test methods cannot meet the comprehensive and complex working conditions simulation test requirements, the main reasons are as follows:

[0004] (1) The magnetic ring speed of the generator is set manually. Considering the convenience of manual operation, a limited number of working points are generally set, which cannot simulate the change of the magnetic ring speed of the turbine caused by the change of the downhole mud flow.

[0005] (2) The load test of the power board generally adopts a fixed load, or the external downhole instrument runs without load, which cannot reflect the load change of the downhole instrument when it is actually working

[0006] (3) Manually measure the output voltage of the turbine generator and the output voltage of the power board. During the test, the load is required to be stable. The test parameters are too few to observe the dynamic response of the parameters such as voltage, current, and power when the magnetic ring speed changes suddenly and the load changes suddenly, so it cannot be accurate. Judging the dynamic performance of the power board and generator

[0007] (4) When connecting the actual downhole instrument for dynamic testing, there is a risk of damage to the instrument and equipment

[0008] (5) There are too few manually recorded data to capture mutation signals, and the data display and analysis capabilities are weak

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