Method for testing electrical property of AC generating set

Abstract

The invention relates to a method for testing the electrical property of an AC generating set, which comprises the following steps: starting an AC generating set, connecting the output of the AC generating set with a test device, and inputting the serial number of the generating set by a laser scanner to activate the test procedures; automatically adjusting the load of the generating set accordingto a preset power-time function; collecting the voltage, current, frequency and other signals of the generating set in real time by a DSP embedded signal processor under a stationary resolution and atransient resolution, and analyzing the frequency spectrum of the generating set; uploading the analysis result to an integral workstation for storage, and comparing the result with the preset electrical property evaluation criteria of the generating set to generate a test report. The invention has the advantages that the test load of the generating set is continuously adjustable; the output voltage and current signals are sampled by a complete period and analyzed by a discrete Forurier technology to rapidly response the change of effective value and acquire the frequency spectrum and the distortion parameters of total harmonic wave; the model number parameters of the generating set are identified automatically, the evaluation criteria of test data is selected automatically, and the testreport is generated automatically.

Description

technical field [0001] The invention belongs to the field of test systems for alternator sets, and in particular relates to a test method for the electrical performance of an alternator set. Background technique [0002] Small-capacity single-phase AC generator sets usually use gasoline or diesel-powered internal combustion engines to drive the AC generator to convert mechanical motion into alternating current (AC). When the AC power is supplied to the load, in order to ensure the safe and reliable operation of the load, generally ensure The voltage and frequency of the output power of the alternator are controlled within a certain range, and for some specific load equipment, it is also necessary to ensure that the distortion rate of the voltage waveform is lower than a given value. Since small and medium power internal combustion engines generally use a flywheel linkage mechanism to adjust the speed, the output voltage of most small capacity alternator sets is not very stab...

AI Technical Summary

Problems solved by technology

[0003] The load test device of the alternator set in the prior art adopts the method of combining the multifunctional electric parameter measuring table and the manual switching load, which has many defects: first, the frequency of the output voltage of the generator fluctuates continuously with the change of the rotational speed, and the common The electrical parameter measuring meter can only be tested by the effective value method because it does not have the dynamic phase-locking function, so its dynamic response speed is low, and it cannot capture the drastic change process of the instantaneous voltage of the load change.

Secondly, the test data is manually recorded with a small number of recording points, which is easy to miss the abnormal state of the generator, destroying the integrity of the test data, and also prone to misoperation

Third, the analysis and judgment of the test data are completely based on the experience of the operator. Not only is there no unified standard, but it is also difficult to provide technical route support for the rework adjustment of the unit

In addition, inconsistent loading methods during the test process, slow test speed, low efficiency, poor controllability of the test process, etc. will also lead to related management problems

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