The Research On Test In Use Technology Of Mining Comprehensive Protector

Mining comprehensive protector (referred to comprehensive protector) is easy to failwhen it is in use, it can lose the protection function to the electrical equipment and system,and this is dangerous for personal safety. In some special situation, it can cause gasexplosion, coal-dust explosion and some other accidents that endanger the mine. Theperiodic function test (called test in use) on mining comprehensive protection can screen outthe invalid comprehensive protector to avoid the accident and guarantee the safety of mineproduction. It is significant for carrying out of the in use test work to improve the veracity,the automatic degree of the test process and its work reliability of comprehensive protector inuse system. On account of the situation that the excitation power is the limited factor whichaffects the veracity and the improvement of the in use system, so the using of direct waveformsynthesis technology develops a program-controlled excitation power that improves theveracity and automatic degree of the test process. Aim at the demand for the extension ofthe comprehensive protector; the universality and expansibility of hardware system andsoftware system of the test system are studied. Then aim at the test system, the reliabilityanalysis has been done and work out a suggestion that improves the test system reliability.The following is the main ideas of the thesis:Fisrt，this thesis analyzed waveform synthesis principle and designed a system which canoutput program-controlled exciting voltage and current source that was used tocomprehensive protector test. By adopting waveform direct digital synthesis technology, theexciting voltage and current source can produce controllable original signal, and the power ofthe original signal is amplified by using high-precision linear technology, then it can be usedin comprehensive protector, which further realized the controllable output and high-precisionoutput of excitation voltage and current.Then,the thesis also conducted systematic studies on hardware. First, under the presupposition that the interface standardization of comprehensive protector has beenimproved as expected, the thesis analyzed hardware resource requirements of comprehensiveprotector test in use and ifnd that it own the least resource requirements. Secondly, bymaking a contrastive analysis to the interface matching modes of the two tests systems-switch array mode and model-speciifc matching circuit mode, the later mode was decidedbeing used to the test system. And then, the thesis took WZB-6GT model Protector asexample and illustrated the design process and design method of model-specific interfacematching circuit.What’s more, software parts were also systematically studied. Firstly, the sotfwarerequirements features of comprehensive protector test in use system were analyzed and thenthe author put forward the software design principles that need to be complied with to fulfillthe requirements of both universality and expandability. In addition, based on these principles,data organization (data structure) design and function (mode) design about the test sotfwarewere made in this study.At last,analyzing the reliability of the hardware system. In this chapter, on the base ofthe structure diagram of former generation system, a reliable model has been build.Adopting the method of FMECA does a reliable analysis to the test system and indentifies thefault mode, effect, and criticality of the assembly units. Find out the main factorsinfluencing the reliability of the test system, and puts forward reliable suggestions on theimprovement of design and the whole system.