Inductance and transformer kind

 

This kind of component includes coil of inductance, transformer, oscillation and filter seamark circle to wait. Its breakdown is caused as a result of outside reason place more, become for example when laden short circuit, because had shed the electric current of coil to exceed rating, transformer temperature is elevatory, cause coil short circuit, open circuit or insulation breakdown. Pass when ventilated and undesirable, temperature tall or when be affected with damp be affected with damp, also can produce the phenomenon of leakage of electricity or insulation puncture.

 

To the breakdown phenomenon of transformer and reason, have the following kinds commonly: After transformer receives electrify source, if core gives out buzzing noise, criterion breakdown reason may be core not clamp or transformer load are overweight; Calorific tall, fumy, scorching or fuse are burned, may be coil short circuit or load overweight.

 

Inductance and transformer kind the breakdown examination of component uses following methods commonly:

 

(1) dc block measures a way

 

The resistor file that uses avometer measures inductance kind the stand or fall of component. When measuring aerial coil, oscillation coil, span should park is the smallest resistor archives (be like R×1W archives) ;

 

When the week in measuring and output input transformer, span should be put in low block archives (R×10W or R×100W archives) . The block value that will measure and the experience data that maintain a data or gather daily are illuminated relatively, if be close to very much,express to be measured component is normal;

 

If block value is less than experience data much, show coil has local short circuit;

 

If express needle indicated value for 0, show coil short circuit. What should notice is, oscillation coil, aerial coil and in the sub resistance of week is very little, have zero ohm only, want especially when reading careful, do not judge by accident for short circuit;

 

With tall block archives (R×10kW) when measuring the resistance between primary coil and secondary coil, should be infinity. If primary, sub between have certain resistance, express primary, sub between have leakage of electricity.

 

(2) electrify examines a way

 

To power source transformer can use the method that electrify checks, see sub voltage whether drop;

 

If sub voltage drops, suspect sub (or primary) have local short circuit;

 

If transformer appears to rapid hair is ironed or have after electrify,burn the phenomenon such as scorching, fume, can judge transformer to have local short circuit for certain.

 

(3) the instrument examines a way

 

Can use watch of tall frequency Q to measure inductance quantity and its Q value, also can judge the phenomenon of local short circuit of low frequency coil with appearance of inductance short circuit;

 

Watch of the Europe that use million can measure power source transformer first, sub the insulation resistance between. If discover transformer has appearance of leakage of electricity may be insulation undesirable or place of be affected with damp be affected with damp causes, can tear open transformer right now come down to go wet drying;

 

Pressure regulating all sorts of carbon brush of transformer or copper are brushed, in safeguard and use undeserved circumstance to fall to wear away extremely easily, its fragment brings about transformer of short circuit burn down with the meeting that accumulate carbon, because this wants at ordinary times,notice to safeguard.

 

Collect is agglomerate kind

 

Electrode open a way or when the main reason that when connecting, breaks is the metal between electrode corrode of migratory, report and technology issue. The main reason of electrode short circuit is report of the metal between electrode diffuses, metallization craft blemish or exotic foreign matter. The main reason that down-lead breaks off is wired diameter not all, stress of insufficient, heat and mechanical stress cross down-lead intensity corrode of big, report. The main reason of electric parameter drift is the reaction that raw material blemish, portable ion causes. Mechanical wear and enclose break main by enclose craft blemish and environmental stress to wait greatly too cause. But weldability difference basically is expected by down-lead material surface of undesirable, down-lead pollutes film of metal of blemish, down-lead, corrode and oxidation is caused. Commonly working environment element causes misfire.

 

The place on put together is narrated, we can know, to make sure equipment or system can be reliable the ground works, to the electron yuan the requirement of dependability of parts of an apparatus is very tall. Dependability index has become one of important quality target of yuan of parts of an apparatus. Understood yuan of failure mode of parts of an apparatus and failure mechanism, to diagnosing the equipment malfunction, dependability that carries equipment it is very important.