1: The dynamo moves without the technical condition that presses a regulation, if stator voltage is exorbitant, iron caustic increases; Bear electric current is too big, caustic of stator winding copper increases;
Frequency is too low, refrigerative fan rotate speed slows, influence dynamo comes loose hot; Power factor is too low, make rotor excitation electric current increases, cause rotor to give out heat. The directive that should check surveillant instrument is normal. Be like abnormal, want to undertake necessary adjustment and processing, make the dynamo moves according to technical condition of the regulation.
2: The three-phase bear electric current of the dynamo is lopsided, the one photograph winding of overload is met overheat; If the difference of three-phase electric current exceeds 10% of rated electric current, belong to serious Gu phase current namely lopsided, lopsided meeting produces three-phase electricity negative phase-sequence magnetic field, increase loss thereby, cause magnetic pole winding to reach the component such as a band to give out heat. Should adjust three-phase bear, make each phase current poises as far as possible.
3: Air channel is jammed by dirt retention, ventilated and undesirable, cause a dynamo to come loose hot difficulty. Should keep clear of air channel dirt retention, oily dirty, make air channel straightway.
4: The temperature that take wind exorbitant or the temperature that drink water is exorbitant, condenser has jam phenomenon. Should reduce take wind or keep clear of into water temperature inside condenser jam content. Did not eliminate in breakdown before, should limit dynamo negative charge, in order to drop dynamo temperature.
5: Bearing adds grease overmuch or too little, answer to add grease by the regulation, the extraction with the 1/2~1/3(low rotate speed that is bearing room normally upper limit, the get offing with high rotate speed is restricted) , and with exceeding bearing room 70% advisable.
6: Bearing wears away. If wear away not serious, make bearing local overheat; If wear away serious, make stator and rotor chafe likely, cause stator and rotor to avoid ministry overheat. Should check bearing to have without noise, if discover stator and rotor chafe, should stop instantly machine undertake the overhaul or change bearing.
7: Stator core insulation damages, cause piece a short circuit, cause core to local eddy current loss increases and give out heat, serious when can make stator winding damages. Should stop instantly machine undertake the overhaul.
8: The shunt-wound lead of stator winding ruptures, make the electric current of other lead increases and calorific. Should stop instantly machine undertake the overhaul.
Dynamo neutral line has unusual voltage rightly
1: Below normal circumstance, the air gap that as a result of Gao Cixie the reason such as wave influence or workmanship creates each magnetic pole to fall not all, the very low voltage that magnetism situation differs and appears, if voltage is in,come several bend over, won't have risk, need not handle.
2: Dynamo winding has short circuit or be isolated from rightly undesirable, bring about electric equipment and dynamo function addle, give out heat easily, answer to be overhauled in time, lest the accident expands.
3: When carrying for nothing, neuter line does not have voltage rightly, and voltage appears when having negative charge, cause, should adjust three-phase bear to make its are balanced basically.
Dynamo electric current is too big
1: Negative charge is too big, should reduce negative charge.
2: Transmission network produces alternate with short circuit or ground connection breakdown, answer circuit to undertake the overhaul, can return to normal after trouble removal.
The dynamo carries voltage exorbitant
1: The voltage of dynamo electrified wire netting that stands side by side with electrified wire netting is exorbitant, should reduce the tension of paratactic dynamo.
2: The breakdown of excitation device has caused excitation, answer to overhaul excitation unit in time.
Power is insufficient
As a result of source of excitation device voltage answer encourage compensates inadequacy, cannot provide the excitation electricity that armature reacts place needs, make the dynamo carries voltage under voltage of electrified wire netting, do not send piece rated without result power, should take following step:
1: Booster of a three-phase is received between dynamo and excitation reactor, carry voltage in order to raise a dynamo, make the magnetism situation of excitation device increases gradually.
2: Those who change magnetomotive force of excitation device voltage and dynamo to carry voltage is phasic, make synthesize total magnetomotive force to increase, can be in reactor every photograph winding two end are shunt-wound the resistor of thousands of Europe, 10W.
3: Reduce the block cost of rheostat, make the excitation electric current of the dynamo increases.
Puncture of stator winding insulation, short circuit
1: Stator winding be affected with damp be affected with damp. Measure insulation resistance to before the dynamo that long-term out of service or classics overhaul more for long, investment moves, answering, unqualified person forbid investment to move. Dynamo of be affected with damp be affected with damp should undertake stoving is handled.
2: Winding itself blemish or overhaul craft are undeserved, cause winding insulation puncture or damage. The insulation grade that should press a regulation chooses insulating material, embed outfit winding and dry of dip Qi Gan to wait should press craft strictly to ask to undertake.
3: Winding overheat. The meeting after insulation overheat makes insulation property is reduced, cause insulation breakdown very quickly in the meeting below high temperature sometimes. Should strengthen daily perambulatory examination, prevent a dynamo to departmental cent produces overheat and damage winding is isolated from.
4: Insulation ageing. General dynamo runs 15~20 year above, ageing of its winding insulation, electric performance varies, make be isolated from even puncture. The overhaul that should make good generator and preventive experiment, if discover insulation is unqualified, defective winding is isolated from or should change in time winding, in order to prolong the service life of the dynamo.
5: Dynamo interior enters metallic foreign body, do not fall metallic thing, spare parts or tool involuntary discharge of urine in stator chamber after overhauling a dynamo; The colligation line that ties close rotor, close solid carries ministry part, because loosen from mental efforts action,happen with be not being sent.
6: Cross big voltage puncture:
① , circuitry suffers be struck by lightning, and the protection that prevent thunder is not perfect. Should perfect establishment of the protection that prevent thunder.
② , operate by accident, when if be in,carrying for nothing, rise dynamo tension exorbitantly. Answer to undertake step up strictly to the dynamo by operating rules, prevent to be operated by accident.
Overvoltage of interior of ③ , dynamo, include to operate harmony of overvoltage of overvoltage, arc ground connection brace up overvoltage, should strengthen winding insulation is preventive experiment, discover in time and eliminate the flaw that exists in stator winding insulation.
Stator core is lax:
Because make,assemble undeserved, core is good without close solid. If be whole core,slacken, to small-sized dynamo, can be less than stator winding to carry the iron plate of ministry internal diameter with two, put on double head bolt, tighten up core. After waiting for resile, again because of, core original clamp bolt is tightened. If local sex core is flabby, but preexistence is flabby piece besmear brushs silicon steel piece lacquer, infiltrate in flabby part again horniness insulating material can.
The short circuit between iron chip
1: Core is folded piece flabby, when the dynamo runs core produces vibration and attaint is isolated from; Damage of specific place insulation hurts iron chip or core is local overheat, make be isolated from ageing, press plan a medium method to undertake handling formerly.
2: Hairiness of iron chip brim is pricked or damage suffers when the overhaul. Apply burr of fine file eliminate, nap injury is in, clean surface, besmear again a silicon steel piece lacquer.
3: Have soldering tin or copper bead weak point receives core, should blow divide or certain to receive solder point except metallic frit, handle good appearance.
4: Winding produces arc short circuit, cause core short circuit possibly also, after answering to keep clear of the part that burn caustic with chisel, handle good appearance.
The dynamo loses remanence, when starting, cannot generate electricity
1: Stop machine hind to often lose remanence, it is the data that uses as a result of place of exciter magnetic pole is close to mild steel, remanence is less. When stopping winding of the excitation after machine to do not have electric current magnetic field disappears, should stock accumulator, advanced before generate electricity travel fills magnetism.
2: The magnetic pole of the dynamo loses magnetism, bigger than rated electric current dc electric current should be connected in winding (time is very short) undertake full magnetism, can restore enough remanence namely.
The excitation reactor temperature of automatic excitation device is exorbitant
1: Reactor coil is local short circuit, should overhaul reactor.
2: The air gap of reactor magnetic circuit is too big, should adjust magnetic circuit air gap.
After the dynamo starts, voltage rises not to rise
1: Excitation loop breaks a string, make voltage rises not to rise. Should check excitation loop to have do not have a line, the contact is good.
2: Remanence disappears, if exciter volmeter does not have written instructions to explain remanence disappears, answer exciter to fill magnetism.
3: The polarity of magnetic field coil of exciter is received instead, should it, negative jumper trade.
4: Connect magnetic field coil by accident when certain test is done in dynamo overhaul with retrorse dc, bring about remanence to disappear or retrorse, answer to undertake full magnetism afresh.
