It is the indispensable important component of generating set of the fire power that thermal technology protects the system, the dependability that thermal technology protects plays a very important role in improving dependability and security that the aircrew mainly complement the apparatus. Especially today, the electric market competition is fierce day by day, thermal technology of the power plant protects and becomes increasingly key technology, need our constant research and complete.

Keyword: Apparatus thermal technology of heat and power plant protects the dependability meaning

0,Foreword

Thermal technology is protected as generating heat the worker protects the meaning of systematic dependability

Indispensable important component of generating set of the fire power, the dependability that thermal technology protects plays a very important role in improving dependability and security that the aircrew mainly complement the apparatus. The function that thermal technology protects the system is when the aircrew mainly complements the parameter in operation of the apparatus to go beyond the normal and controllable range, link the relevant apparatus promptly automatically, take the corresponding measure to protect in time, thus soften the aircrew or equipment fault and avoid great apparatus damaging or other serious consequences. But while mainly complementing the normal running of the apparatus, it causes movements because of one’s own trouble to protect the system, cause and mainly complement the stoppage in transit of apparatus, is called and protected moving by mistake, and cause the unnecessary economic losses; While mainly complementing the apparatus and breaking down, protect the system and break down too without acting, called and protected refusing to move, and the inevitable and enlargement that caused the accident.

With the increase of the generating set capacity and improvement of parameter, the automatic intensity of thermal technology is higher and higher, especially is accompanied by the wide application in the electric course of DCS scattered control system and develops constantly, DCS control system relies on its strong function and superiority, makes dependability, security, economic operation of the aircrew get very great improvement. But more and more because of participating in the thermal technology parameter that is protected with the increase of the unit capacity, take place aircrew or apparatus move or refuse probability that move more and more great by mistake, thermal technology protect move and refuse situation that work up take place occasionally by mistake. So, improve the dependability that thermal technology protects the system and reduce or dispel DCS system and does not work and protect and move, refuse to move and have very important meanings with thermal technology by mistake.

2,Thermal technology protects the reason analysis of moving and refusing to move by mistake

Thermal technology can roughly be summarized while protecting the reason moved, refused to move by mistake: Trouble of the DCS software and hardware; Heat accuses of the component trouble; Intermediate link and two table troubles; The wiring of cable shorts out, connects in the broken circuit, void; Heat accuses of the power trouble of the apparatus; Human factor; Design, install, debug defect.

The intersection of 2.1DCS and the intersection of software and hardware and with the development of DCS control system, in order to ensure the safety of aircrew, reliable trouble, thermal technology join, control and stand by some important course protect, ‘ For instance: DEH, CCS, BMS,etc. Shutting down at the time of the trouble of two CPUs is protected, therefore, the protection caused by trouble of the DCS software and hardware moves and happens occasionally by mistake. The main reason is the signal the trouble of dealing with the card, outputting module, presuming value module, network communication etc. causes.

2.2 heat accuses of the component trouble because of the component trouble of thermal technology including temperature, pressure, liquid location, flow, position component of the valve, electromagnetic valve etc. Host computer that signal and cause by mistake, person who complement protect, move, refuse proportion accounted for to work up larger too by mistake, some power plant trouble cause thermal technology protect, move, refuse, move by mistake and reach half the because of the intersection of thermal technology and component. Main reason wear out component and quality reliable, the intersection of unit and pieces of job, irredundant to set up and discern.

2.3 cables of wiring short out, broken circuit, timid to collect the intersection of cable and the intersection of wiring and broken circuit, broken circuit, timid protection caused to collect, move main reason wear out insulating to destroy cable and binding post it enters water, air to be moist to corrode etc., cause by mistake.

2.4 the intersection of apparatus and the intersection of power and trouble, with accuse of the intersection of system and automatic improvement of intensity, thermal technology join the intersection of DCS and the intersection of system and some course control, stand power trouble shut down and protect protect. It has the tendency to rise too that thermal technology caused by the fact that heat accuses of the power trouble of the apparatus protects the number of times moved, refused to move by mistake. Main reason whether heat accuse of the intersection of apparatus and power receive plug-in package, exposed to bad designing, causing reliably by the intersection of power and system.

2.5 the intersection of human factor and caused by human factor protection move because the intersection of thermal technology and personnel leave interval by mistake mostly by mistake, misunderstand the intersection of end and son, arrange wiring, force or leak, force signal, the intersection of universal meter and the intersection of person who improperly use and misoperation,etc. cause, boil, decrease by mistake.

2.6 is designed, install, debug, have defect a lot of aircrew, accuse of the intersection of apparatus and system design, install, debug, store the quality defect in lead to the fact aircrew thermal technology protect, work up or refuse, work up by mistake because of heat.

3,Improve principle and measure that thermal technology protects

3.1 respects original thermal technology protect and design original thermal technology to protect the project and was designed out through research and practice for many years by apparatus producer, comparatively ripe, the power plant should not change him at will before requesting for agreement to producer as the user of the apparatus, let alone delete, can only mend and leak and improve.

It is tried transporting and recording and protecting the hardware apparatus that the system uses and implementing the system of track record to important thermal technology that 3.2 sets up the apparatus. The dependability that thermal technology protects the system directly relates to dependability of the hardware apparatus of the system, so the dependability of the necessary security system hardware apparatus, especially protect and export the dependability of one of the card, pay checking in measuring component and card one before the regular method is protected and put into operation each time, it is qualified to use to confirm. Will appear check-up in the practical application finding componenting or blocking piece qualified trouble lead to the fact the incident that the apparatus work up by mistake in operation. This is because it is more harsh with installing the requirement to the environment that heat accuses of the apparatus, especially electronic apparatus, half-hearted installing and there is no effective products to protect will all cause the appearance of the trouble, there is existence that special troubles will also be very concealed, so will probably ignore the accident potential. The possibility appearing on the basis of this kind of situation, only do the record well in debugging operation, follow every a series of development of protecting systematic check-up strictly, could avoid the emergence of the accident effectively.

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