Electric equipment aborning is used extensively already, and electric breakdown is inevitable, how to discharge checking electric breakdown is electrical engineering people the one big problem that face. Electric maintenance technician is the main technique force that face and solves this outstanding problem, its breakdown location can be searched well and truly in producing application actually, eliminate breakdown to make electric equipment can move steadily normally thereby, this is the obligation that each maintenance technician should use up and duty.
A little electric breakdown can connect the apparatus such as outstanding hand, eye, nose, ear, use feel, look, hear, listen etc paragraph, equipment of direct perception breakdown warms up unusually, oscillatory, odour, noise, color changes etc, determine the breakdown position of equipment.
Will introduce 23 electrical engineering the most commonly used diagnostic a pithy formula to everybody next, useful knowledge remembers sharing!
1, electric power transformer is unusual the judgement of noise
Run normal transformer, clarity with a buzz rings equably. Match crack noise to have unusual, judgement breakdown chooses an account. Buzz big tone is tall, overload or it is overvoltage.
Intermittent and violent cackle, single-phase load is added quickly. Bite dingdong strikes tone when hammer, the screw that wear a heart already became loose. Bang of Pi Pi bang pats applause, core ground wire leaves.
Intermittence gives out Chi Chi sound, core ground connection is bad disease. Winding short circuit is slighter, give out blast a crackle. Winding short circuit is more serious, give out tremendous and plangent sound.
High-pressured bushing has crack, give out high frequency fizz. High-pressured down-lead carapace shows subsidiary channels in the human body through which vital energy, blast of bang of Pi Pi bang cracks sound. Low-pressure look line has ground contact, old far hear bang fulminant.
Decline switch divides contact, contact noise of undesirable Zhi Zhi.
2, detect with transistor radio electric equipment partial discharge
Perambulatory change distribution facilities, partial discharge difficult discovery. Carry pocket radio, tone arrives without broadcasting station. Volume leaves to hear sound greatly, even buzz is normal.
If noise is irregular, clip has reputation of very noisy firecracker, or have very noisy squeak, there is partial discharge around. Next volume closes a little bit small, stand by equipment to chase a stage to measure.
Answer hear firecracker voice again, the equipment that be measured has trouble, this equipment partial discharge, emit high frequency electromagnetic wave.
3, apply listen to phonic club to diagnose electromotor common breakdown
Apply listen to phonic marvellous fact, decide electromotor breakdown. Hear continuously Ca Ca sound, rotor and stator are touched brush. Rotate speed slows buzz, coil touchs housing posture ground contact.
Rotate speed slows throat utter a word, coil breaks a line to be short of one photograph. Catcall breaths out slowly in bearing room, bearing lube dries up. Bearing place cackle, conclude bearing already damaged.
4, body of lever of examination wood pole is hollow with knock law
Pole of perambulatory examination wood, lever body all around hammer knock. Should become ringing reputation is good, body of Dong Dong noise is hollow.
5, pare with the root head insulation lead examines state of insulation of generation set bearing
When generation set moves, bearing insulation examines opportunely. Pare with the root the head is isolated from line, lead directly first ground connection, other end is touched touch runner shaft coming back, for many times kiss young scrutiny.
Generation scintilla insulation is poor, insulation is good without scintilla.
6, neutral site not the judgement of breakdown of single-phase ground connection in ground connection system
Three-phase voltage who is the biggest, next photographs have trouble certainly.
7, capacitor of perambulatory examination electric power
Perambulatory examination capacitor, oily temperature rise of leakage bosomy abdomen exceeds. Cluck cluck noise is abnormal, interior has discharge trouble.
8, with the stand or fall that charges discharge law to judge small-sized capacitor
Small-sized capacitor stand or fall, fill discharge law thick judgement. Capacitance two termination power source, charge about one minute. With wire of copper of exterminatory predestined relationship, short receive capacitance two electrode.
Scintilla is ablaze it is good, already damaged without scintilla.
9, identify plumbic accumulator polarity
Plumbic accumulator is polar quality, losing earmark to look not clear. Terminal color will distinguish, negative pole blueness is grey deep palm. Terminal is distinguished locally, sign relying on a factory is extremely decorous.
Terminal diameter is not identical, positive electrode is thicker negative pole is fine. Break off saw blade delimits terminal, qualitative harder for positive electrode. Terminal down-lead inserts yam, line week becomes green is positive electrode.
Join terminal two lead, immerge is rare vitriolic solution, generation bleb carries negative pole, extremely decorous without bleb.
10, the law that blow fire examines cell of accumulator simple case whether short circuit
Accumulator interior short circuit, happen in 9 case more. Short circuit of simple case batteries is denied, commonly used examination of the law that blow fire. With the root relatively blister copper lead, accept the order case batteries one extremely,
The hand takes copper cash other one aspect of the matter, brush quickly delimit another extremely. Lubricious scintilla of occurrence La Bai, be belonged to by check simple case good. Gules scintilla is to lack report, without scintilla already short circuit.
{! - - PGC_COLUMN- - }11, the law checks the phase voltage in smoking electric energy of two component three-phase expresses wiring
3 lines electric energy expresses three-phase, the phase voltage in smoking is checked. Changeless circumstance issues negative charge, the phase voltage in disconnecting line.
Watch electric energy to express movement, disc is turning slow half, exclusive validity wiring, otherwise wiring has a mistake.
12, whether does fist of planted agent of judgement microamper watch break a string
Microamper expresses coil to be connected, avometer cannot be measured sentence. Column of the wiring after microamper is expressed, verdigris lead is short had received, next jolty microamper watch, see the hand that express a head at the same time.
Slow swing scope is little, the coil inside the watch is in good condition. Swing more quickly substantially, the coil inside the watch already broke a string.
13, will analyse judgement breakdown according to state of frit silk fusing
Treat condition of frit silk fusing, judge the breakdown inside circuit. Appear frit silk Quan Rong explodes, serious overload or short circuit. Frit silk is mid fracture surface is small, normal overload time is long. Break near crimp bolt, installation is injured not impaction.
14, according to lubricious annulus the mark identifies resistor size
Finished product is small-sized resistor, lubricious annulus is nominal resistance. The first annulus decides lubricious annulus, stand by resistor brim annulus. Most one annulus is end deviation, reciprocal 2 annulus are multiple.
Block of the others lubricious annulus is worth annulus, state block is worth significance. Color patch color represents number, times several square values of 10. La Zi of olivine of palm blood orange, just a little thirty-four thousand five hundred and sixty-seven, grey 89 Bai Hei is 0, jin Yiyin 2 negative multiple.
15, line of insulation of inferior aluminium core identifies a way
Line of plastic insulation aluminous core, see the skin that feel core know actor of low quality. Silvery white of core line softness, inferior harder look sends black.
Cortical scenery is gorgeous imprint factory name, inferior stale does not have a label. Cortical core line contact is close, inferior a big core small pine.
16, the stand or fall that differentiates incandescent lamp bulb
Stand or fall of incandescent lamp bulb, soon fingerprint will differentiate. Bubble circle is bright and clean without sand holes, commodity label lettering is clear. Vitreous lampwick is not askew, filar hook tungsten filament is arranged all. Lamp holder is installed not askew, a bit tug does not feel loose.
17, the quality that differentiates transformer oil
Transformer is watched outside oil, new oil normally flaxen. Shallow red is shown after moving, oleaginous ageing color pales, intensity is different color is different, char is serious color is nigrescent.
Test tube fills oil to greet light to look, good oil is transparent have fluorescence. Do not have blue purple to glance, diaphaneity difference has a foreign body. Good transformer oily insipidity, or have taste of a bit kerosene.
Dry overheat anxious stink, serious ageing has tart flavor. The generation inside oil crosses electric arc, can smell acetylene flavour.
18, drop water detects electromotor temperature rise
Water of drop of electric machinery temperature rise is measured, a few water are sprinkled on housing. Risk steam not to have sound only, the electric machinery that be measured does not have overheat. The whistle when risking steam whistles noisy,
19, before three-phase electromotor did not install rotor, decide the simple method that change direction
Electromotor changes direction forecast, rotor was not installed decide law. Cupreous silk curves bucket form, stator internal diameter decides bucket way. Stator vertical stroke is put had secured, cotton thread well-bucket is put among them.
The bucket stops firm hind twinkling electrify, the bucket rotates to change direction surely namely.
20, intensity of electromotor insulation machinery standard of 4 class differentiate
Bad of electromotor insulation actor, mechanical intensity will measure. The sense organ diagnoses finger to press, law of differentiate of 4 grade level. Finger is pressed pressure flawless, insulation qualification feel is good.
Produce small crackle on time, insulation is in weak condition. Happen to be out of shape greatly on time, insulation is bad already stop to use.
21, feel lukewarm law detects electromotor temperature rise
Electromotor runs temperature, feel lukewarm law will detect. Hand thrum tries not to become aware very hot, the back of hand is smooth put housing. Touch for a long time the hand is erubescent, 50 degrees or so a bit hot.
The hand can keep two 3 seconds, 65 degrees are very hot. After the hand touchs, iron very, 75 degrees are amounted to extremely hot. It is difficult that the hand just touched bear, 85 degrees already overheat.
22, fuse frit provides fingerprint low pressure insulation place temperature fast fusing of the photograph that where to sentence
Low-pressure distribution screen dish go up, arrange many fuse. Fingerprint frit runs insulation department, frit of very hot hand is in charge of fuse-element to break.
23, the drop of discontinuous core breakdown that the hand helps electrical wiring law search flexible cord
Odd core oak covers soft electrical wiring, discontinuous core searchs a law in. Both hands holds a line cortical, removed more than 200 millimeter. Pull outside forcibly at the same time, chase paragraph of examination to look carefully.
Abrupt attenuate handles line way, it is spot of the trouble that break core.
If electric breakdown relies on direct perception of the person to cannot determine position, need have the aid of all sorts of instruments, appearance, value of the voltage to breakdown equipment, electric current, power, frequency, impedance, insulation, temperature, amplitude, rotate speed has an amount etc, in order to determine breakdown position.
A pithy formula of electrical engineering skill is bright handy of exercise of electrician of able to read aloud fluently!
1, electrical engineering 3 lines
Electrician holds 3 lines, live wire 0 lines lifeline, 3 front line are motivation, one fire 10 it is illume. Body allotment of labour provides 4 big, wire-cutter of electric knife bottle opener, contain spanner to wear exterior line, working whole journey stresses safety.
2, exterior line works
The exercise on lever gets setup, spanner of at somebody's convenience can be measured, space size should hold, uniform standard an appearance. Spur low pressure high a meter 5, low spur low pressure but 80 ① , spanner measures stringy rope range finding, one material is multi-purpose have safeguard.
Note: ? Jiu steel finishs tall, low-pressure horizontal stroke carries Zha? the distance between, 80 are 80cm.
3, indoor overhaul
The overhaul that check a line has want a way, contact contact weighs enumeration, check fountainhead fusing silk first, breakdown arranges a cane to feel melon. Fire does not shine is 0 lines, or it is switch accuses complex phase, have fire dim it is an induction, broke without fire without report.
4, value life
With weighing a talent originally artificially, others regard highly more self-love, always safety is paid no attention to, act recklessly of violate the rules and regulations can go out bad. Should know life, lose won't come back again, father high meticulous to the job, accompany you happily all one's life to be in.
5, learn gist of electrical engineering knowledge
Electrical engineering knowledge is really wonderful, microcosmic domain goes discussing, matter is small unfamiliar not witting, macroscopical universe photograph is compared. The heavenly bodies has each, follow the pattern not turn things upside down, electric origin looks for the root, get greatly think carefully to know.
6, electrical engineering exercise 3 lines 4 big
Electrician holds 3 lines, live wire 0 lines lifeline,
Much power of 3 front line, one fire 10 do illume.
Body allotment of labour provides 4 big, wire-cutter of electric knife bottle opener,
Contain spanner to wear exterior line, working whole journey stresses safety.
7, electrical engineering exercise plays sanxian
Electrical engineering exercise plays sanxian, appearance determines standard sound,
Dial beauty of flick away music, achieve gives society and homophonic.
Commonly used tool is ripe dial practice, play move 3 motivation to cry,
Illume sends light twice, worker of report of China much charming.
8, installation of exterior line erect
The exercise on lever gets setup, spanner of at somebody's convenience can be measured,
Space size should hold, uniform standard an appearance.
Spur low pressure high a meter 5, low spur low pressure but 80,
Spanner measures stringy rope range finding, one material is multi-purpose have safeguard.
9, estimation of distribution lead current-carrying capacity
Insulation lead is fully loaded with stream, lead is sectional multiply multiple,
2.5 multiply with 9, upgrade is decreased arrange date to go.
35 by 3.5, in pairs is become group reduce a point 5,
The temperature that wear a canal 89 fold, bare wire carries stream add an in part.
10, dc road 3 parameter
Dc road 3 parameter, voltaic voltage and resistor, voltaic I incoming telegram presses U, resistor R blocks electric current up.
Electronic flow makes electricity, voltage points to two difference more, resistor accord with Ou Miga, electric current installs V of A bend over to press.
11, knowledge of alternating current power
Communication power has 3 kinds, character expresses to also differ, inspect in S, without result Q, the meaning of P is have rendered great service. Power unit is what each, it is power together different, inspect result lack is not had in volt-ampere, but unit of have rendered great service is made of baked clay.
12, budgetary estimate of electric current of negative charge of commonly used and electric equipment
How is practical electric current begged, estimation method is pallet also, illume kilowatt 4.5, electric power kilowatt flows twice. Single-phase electric machinery is pressed 8 how, half as much again of three-phase electric heat, two-phase voltage 308, 2.7 how be electric welding.
13, treasure life to stress safety
With weighing a talent originally artificially, others regard highly more self-love, always safety is paid no attention to, act recklessly of violate the rules and regulations can go out bad. Should know life, lose won't come back again, father high meticulous to the job, accompany you happily all one's life to be in.
Electric equipment aborning is used extensively already, and electric breakdown is inevitable, how to discharge checking electric breakdown is electrical engineering people the one big problem that face. Electric maintenance technician is the main technique force that face and solves this outstanding problem, its breakdown location can be searched well and truly in producing application actually, eliminate breakdown to make electric equipment can move steadily normally thereby, this is the obligation that each maintenance technician should use up and duty.
A little electric breakdown can connect the apparatus such as outstanding hand, eye, nose, ear, use feel, look, hear, listen etc paragraph, equipment of direct perception breakdown warms up unusually, oscillatory, odour, noise, color changes etc, determine the breakdown position of equipment.
Will introduce 23 electrical engineering the most commonly used diagnostic a pithy formula to everybody next, useful knowledge remembers sharing!
1, electric power transformer is unusual the judgement of noise
Run normal transformer, clarity with a buzz rings equably. Match crack noise to have unusual, judgement breakdown chooses an account. Buzz big tone is tall, overload or it is overvoltage.
Intermittent and violent cackle, single-phase load is added quickly. Bite dingdong strikes tone when hammer, the screw that wear a heart already became loose. Bang of Pi Pi bang pats applause, core ground wire leaves.
Intermittence gives out Chi Chi sound, core ground connection is bad disease. Winding short circuit is slighter, give out blast a crackle. Winding short circuit is more serious, give out tremendous and plangent sound.
High-pressured bushing has crack, give out high frequency fizz. High-pressured down-lead carapace shows subsidiary channels in the human body through which vital energy, blast of bang of Pi Pi bang cracks sound. Low-pressure look line has ground contact, old far hear bang fulminant.
Decline switch divides contact, contact noise of undesirable Zhi Zhi.
2, detect with transistor radio electric equipment partial discharge
Perambulatory change distribution facilities, partial discharge difficult discovery. Carry pocket radio, tone arrives without broadcasting station. Volume leaves to hear sound greatly, even buzz is normal.
If noise is irregular, clip has reputation of very noisy firecracker, or have very noisy squeak, there is partial discharge around. Next volume closes a little bit small, stand by equipment to chase a stage to measure.
Answer hear firecracker voice again, the equipment that be measured has trouble, this equipment partial discharge, emit high frequency electromagnetic wave.
3, apply listen to phonic club to diagnose electromotor common breakdown
Apply listen to phonic marvellous fact, decide electromotor breakdown. Hear continuously Ca Ca sound, rotor and stator are touched brush. Rotate speed slows buzz, coil touchs housing posture ground contact.
Rotate speed slows throat utter a word, coil breaks a line to be short of one photograph. Catcall breaths out slowly in bearing room, bearing lube dries up. Bearing place cackle, conclude bearing already damaged.
4, body of lever of examination wood pole is hollow with knock law
Pole of perambulatory examination wood, lever body all around hammer knock. Should become ringing reputation is good, body of Dong Dong noise is hollow.
5, pare with the root head insulation lead examines state of insulation of generation set bearing
When generation set moves, bearing insulation examines opportunely. Pare with the root the head is isolated from line, lead directly first ground connection, other end is touched touch runner shaft coming back, for many times kiss young scrutiny.
Generation scintilla insulation is poor, insulation is good without scintilla.
6, neutral site not the judgement of breakdown of single-phase ground connection in ground connection system
Three-phase voltage who is the biggest, next photographs have trouble certainly.
7, capacitor of perambulatory examination electric power
Perambulatory examination capacitor, oily temperature rise of leakage bosomy abdomen exceeds. Cluck cluck noise is abnormal, interior has discharge trouble.
8, with the stand or fall that charges discharge law to judge small-sized capacitor
Small-sized capacitor stand or fall, fill discharge law thick judgement. Capacitance two termination power source, charge about one minute. With wire of copper of exterminatory predestined relationship, short receive capacitance two electrode.
Scintilla is ablaze it is good, already damaged without scintilla.
9, identify plumbic accumulator polarity
Plumbic accumulator is polar quality, losing earmark to look not clear. Terminal color will distinguish, negative pole blueness is grey deep palm. Terminal is distinguished locally, sign relying on a factory is extremely decorous.
Terminal diameter is not identical, positive electrode is thicker negative pole is fine. Break off saw blade delimits terminal, qualitative harder for positive electrode. Terminal down-lead inserts yam, line week becomes green is positive electrode.
Join terminal two lead, immerge is rare vitriolic solution, generation bleb carries negative pole, extremely decorous without bleb.
10, the law that blow fire examines cell of accumulator simple case whether short circuit
Accumulator interior short circuit, happen in 9 case more. Short circuit of simple case batteries is denied, commonly used examination of the law that blow fire. With the root relatively blister copper lead, accept the order case batteries one extremely,
The hand takes copper cash other one aspect of the matter, brush quickly delimit another extremely. Lubricious scintilla of occurrence La Bai, be belonged to by check simple case good. Gules scintilla is to lack report, without scintilla already short circuit.
11, the law checks the phase voltage in smoking electric energy of two component three-phase expresses wiring
3 lines electric energy expresses three-phase, the phase voltage in smoking is checked. Changeless circumstance issues negative charge, the phase voltage in disconnecting line.
Watch electric energy to express movement, disc is turning slow half, exclusive validity wiring, otherwise wiring has a mistake.
12, whether does fist of planted agent of judgement microamper watch break a string
Microamper expresses coil to be connected, avometer cannot be measured sentence. Column of the wiring after microamper is expressed, verdigris lead is short had received, next jolty microamper watch, see the hand that express a head at the same time.
Slow swing scope is little, the coil inside the watch is in good condition. Swing more quickly substantially, the coil inside the watch already broke a string.
13, will analyse judgement breakdown according to state of frit silk fusing
Treat condition of frit silk fusing, judge the breakdown inside circuit. Appear frit silk Quan Rong explodes, serious overload or short circuit. Frit silk is mid fracture surface is small, normal overload time is long. Break near crimp bolt, installation is injured not impaction.
14, according to lubricious annulus the mark identifies resistor size
Finished product is small-sized resistor, lubricious annulus is nominal resistance. The first annulus decides lubricious annulus, stand by resistor brim annulus. Most one annulus is end deviation, reciprocal 2 annulus are multiple.
Block of the others lubricious annulus is worth annulus, state block is worth significance. Color patch color represents number, times several square values of 10. La Zi of olivine of palm blood orange, just a little thirty-four thousand five hundred and sixty-seven, grey 89 Bai Hei is 0, jin Yiyin 2 negative multiple.
15, line of insulation of inferior aluminium core identifies a way
Line of plastic insulation aluminous core, see the skin that feel core know actor of low quality. Silvery white of core line softness, inferior harder look sends black.
Cortical scenery is gorgeous imprint factory name, inferior stale does not have a label. Cortical core line contact is close, inferior a big core small pine.
16, the stand or fall that differentiates incandescent lamp bulb
Stand or fall of incandescent lamp bulb, soon fingerprint will differentiate. Bubble circle is bright and clean without sand holes, commodity label lettering is clear. Vitreous lampwick is not askew, filar hook tungsten filament is arranged all. Lamp holder is installed not askew, a bit tug does not feel loose.
17, the quality that differentiates transformer oil
Transformer is watched outside oil, new oil normally flaxen. Shallow red is shown after moving, oleaginous ageing color pales, intensity is different color is different, char is serious color is nigrescent.
Test tube fills oil to greet light to look, good oil is transparent have fluorescence. Do not have blue purple to glance, diaphaneity difference has a foreign body. Good transformer oily insipidity, or have taste of a bit kerosene.
Dry overheat anxious stink, serious ageing has tart flavor. The generation inside oil crosses electric arc, can smell acetylene flavour.
18, drop water detects electromotor temperature rise
Water of drop of electric machinery temperature rise is measured, a few water are sprinkled on housing. Risk steam not to have sound only, the electric machinery that be measured does not have overheat. The whistle when risking steam whistles noisy,
19, before three-phase electromotor did not install rotor, decide the simple method that change direction
Electromotor changes direction forecast, rotor was not installed decide law. Cupreous silk curves bucket form, stator internal diameter decides bucket way. Stator vertical stroke is put had secured, cotton thread well-bucket is put among them.
The bucket stops firm hind twinkling electrify, the bucket rotates to change direction surely namely.
20, intensity of electromotor insulation machinery standard of 4 class differentiate
Bad of electromotor insulation actor, mechanical intensity will measure. The sense organ diagnoses finger to press, law of differentiate of 4 grade level. Finger is pressed pressure flawless, insulation qualification feel is good.
Produce small crackle on time, insulation is in weak condition. Happen to be out of shape greatly on time, insulation is bad already stop to use.
21, feel lukewarm law detects electromotor temperature rise
Electromotor runs temperature, feel lukewarm law will detect. Hand thrum tries not to become aware very hot, the back of hand is smooth put housing. Touch for a long time the hand is erubescent, 50 degrees or so a bit hot.
The hand can keep two 3 seconds, 65 degrees are very hot. After the hand touchs, iron very, 75 degrees are amounted to extremely hot. It is difficult that the hand just touched bear, 85 degrees already overheat.
22, fuse frit provides fingerprint low pressure insulation place temperature fast fusing of the photograph that where to sentence
Low-pressure distribution screen dish go up, arrange many fuse. Fingerprint frit runs insulation department, frit of very hot hand is in charge of fuse-element to break.
23, the drop of discontinuous core breakdown that the hand helps electrical wiring law search flexible cord
Odd core oak covers soft electrical wiring, discontinuous core searchs a law in. Both hands holds a line cortical, removed more than 200 millimeter. Pull outside forcibly at the same time, chase paragraph of examination to look carefully.
Abrupt attenuate handles line way, it is spot of the trouble that break core.
If electric breakdown relies on direct perception of the person to cannot determine position, need have the aid of all sorts of instruments, appearance, value of the voltage to breakdown equipment, electric current, power, frequency, impedance, insulation, temperature, amplitude, rotate speed has an amount etc, in order to determine breakdown position.
A pithy formula of electrical engineering skill is bright handy of exercise of electrician of able to read aloud fluently!
1, electrical engineering 3 lines
Electrician holds 3 lines, live wire 0 lines lifeline, 3 front line are motivation, one fire 10 it is illume. Body allotment of labour provides 4 big, wire-cutter of electric knife bottle opener, contain spanner to wear exterior line, working whole journey stresses safety.
2, exterior line works
The exercise on lever gets setup, spanner of at somebody's convenience can be measured, space size should hold, uniform standard an appearance. Spur low pressure high a meter 5, low spur low pressure but 80 ① , spanner measures stringy rope range finding, one material is multi-purpose have safeguard.
Note: ? Jiu steel finishs tall, low-pressure horizontal stroke carries Zha? the distance between, 80 are 80cm.
3, indoor overhaul
The overhaul that check a line has want a way, contact contact weighs enumeration, check fountainhead fusing silk first, breakdown arranges a cane to feel melon. Fire does not shine is 0 lines, or it is switch accuses complex phase, have fire dim it is an induction, broke without fire without report.
4, value life
With weighing a talent originally artificially, others regard highly more self-love, always safety is paid no attention to, act recklessly of violate the rules and regulations can go out bad. Should know life, lose won't come back again, father high meticulous to the job, accompany you happily all one's life to be in.
5, learn gist of electrical engineering knowledge
Electrical engineering knowledge is really wonderful, microcosmic domain goes discussing, matter is small unfamiliar not witting, macroscopical universe photograph is compared. The heavenly bodies has each, follow the pattern not turn things upside down, electric origin looks for the root, get greatly think carefully to know.
6, electrical engineering exercise 3 lines 4 big
Electrician holds 3 lines, live wire 0 lines lifeline,
Much power of 3 front line, one fire 10 do illume.
Body allotment of labour provides 4 big, wire-cutter of electric knife bottle opener,
Contain spanner to wear exterior line, working whole journey stresses safety.
7, electrical engineering exercise plays sanxian
Electrical engineering exercise plays sanxian, appearance determines standard sound,
Dial beauty of flick away music, achieve gives society and homophonic.
Commonly used tool is ripe dial practice, play move 3 motivation to cry,
Illume sends light twice, worker of report of China much charming.
8, installation of exterior line erect
The exercise on lever gets setup, spanner of at somebody's convenience can be measured,
Space size should hold, uniform standard an appearance.
Spur low pressure high a meter 5, low spur low pressure but 80,
Spanner measures stringy rope range finding, one material is multi-purpose have safeguard.
9, estimation of distribution lead current-carrying capacity
Insulation lead is fully loaded with stream, lead is sectional multiply multiple,
2.5 multiply with 9, upgrade is decreased arrange date to go.
35 by 3.5, in pairs is become group reduce a point 5,
The temperature that wear a canal 89 fold, bare wire carries stream add an in part.
10, dc road 3 parameter
Dc road 3 parameter, voltaic voltage and resistor, voltaic I incoming telegram presses U, resistor R blocks electric current up.
Electronic flow makes electricity, voltage points to two difference more, resistor accord with Ou Miga, electric current installs V of A bend over to press.
11, knowledge of alternating current power
Communication power has 3 kinds, character expresses to also differ, inspect in S, without result Q, the meaning of P is have rendered great service. Power unit is what each, it is power together different, inspect result lack is not had in volt-ampere, but unit of have rendered great service is made of baked clay.
12, budgetary estimate of electric current of negative charge of commonly used and electric equipment
How is practical electric current begged, estimation method is pallet also, illume kilowatt 4.5, electric power kilowatt flows twice. Single-phase electric machinery is pressed 8 how, half as much again of three-phase electric heat, two-phase voltage 308, 2.7 how be electric welding.
13, treasure life to stress safety
With weighing a talent originally artificially, others regard highly more self-love, always safety is paid no attention to, act recklessly of violate the rules and regulations can go out bad. Should know life, lose won't come back again, father high meticulous to the job, accompany you happily all one's life to be in.
Electric equipment aborning is used extensively already, and electric breakdown is inevitable, how to discharge checking electric breakdown is electrical engineering people the one big problem that face. Electric maintenance technician is the main technique force that face and solves this outstanding problem, its breakdown location can be searched well and truly in producing application actually, eliminate breakdown to make electric equipment can move steadily normally thereby, this is the obligation that each maintenance technician should use up and duty.
A little electric breakdown can connect the apparatus such as outstanding hand, eye, nose, ear, use feel, look, hear, listen etc paragraph, equipment of direct perception breakdown warms up unusually, oscillatory, odour, noise, color changes etc, determine the breakdown position of equipment.
Will introduce 23 electrical engineering the most commonly used diagnostic a pithy formula to everybody next, useful knowledge remembers sharing!
1, electric power transformer is unusual the judgement of noise
Run normal transformer, clarity with a buzz rings equably. Match crack noise to have unusual, judgement breakdown chooses an account. Buzz big tone is tall, overload or it is overvoltage.
Intermittent and violent cackle, single-phase load is added quickly. Bite dingdong strikes tone when hammer, the screw that wear a heart already became loose. Bang of Pi Pi bang pats applause, core ground wire leaves.
Intermittence gives out Chi Chi sound, core ground connection is bad disease. Winding short circuit is slighter, give out blast a crackle. Winding short circuit is more serious, give out tremendous and plangent sound.
High-pressured bushing has crack, give out high frequency fizz. High-pressured down-lead carapace shows subsidiary channels in the human body through which vital energy, blast of bang of Pi Pi bang cracks sound. Low-pressure look line has ground contact, old far hear bang fulminant.
Decline switch divides contact, contact noise of undesirable Zhi Zhi.
2, detect with transistor radio electric equipment partial discharge
Perambulatory change distribution facilities, partial discharge difficult discovery. Carry pocket radio, tone arrives without broadcasting station. Volume leaves to hear sound greatly, even buzz is normal.
If noise is irregular, clip has reputation of very noisy firecracker, or have very noisy squeak, there is partial discharge around. Next volume closes a little bit small, stand by equipment to chase a stage to measure.
Answer hear firecracker voice again, the equipment that be measured has trouble, this equipment partial discharge, emit high frequency electromagnetic wave.
3, apply listen to phonic club to diagnose electromotor common breakdown
Apply listen to phonic marvellous fact, decide electromotor breakdown. Hear continuously Ca Ca sound, rotor and stator are touched brush. Rotate speed slows buzz, coil touchs housing posture ground contact.
Rotate speed slows throat utter a word, coil breaks a line to be short of one photograph. Catcall breaths out slowly in bearing room, bearing lube dries up. Bearing place cackle, conclude bearing already damaged.
4, body of lever of examination wood pole is hollow with knock law
Pole of perambulatory examination wood, lever body all around hammer knock. Should become ringing reputation is good, body of Dong Dong noise is hollow.
5, pare with the root head insulation lead examines state of insulation of generation set bearing
When generation set moves, bearing insulation examines opportunely. Pare with the root the head is isolated from line, lead directly first ground connection, other end is touched touch runner shaft coming back, for many times kiss young scrutiny.
Generation scintilla insulation is poor, insulation is good without scintilla.
6, neutral site not the judgement of breakdown of single-phase ground connection in ground connection system
Three-phase voltage who is the biggest, next photographs have trouble certainly.
7, capacitor of perambulatory examination electric power
Perambulatory examination capacitor, oily temperature rise of leakage bosomy abdomen exceeds. Cluck cluck noise is abnormal, interior has discharge trouble.
8, with the stand or fall that charges discharge law to judge small-sized capacitor
Small-sized capacitor stand or fall, fill discharge law thick judgement. Capacitance two termination power source, charge about one minute. With wire of copper of exterminatory predestined relationship, short receive capacitance two electrode.
Scintilla is ablaze it is good, already damaged without scintilla.
9, identify plumbic accumulator polarity
Plumbic accumulator is polar quality, losing earmark to look not clear. Terminal color will distinguish, negative pole blueness is grey deep palm. Terminal is distinguished locally, sign relying on a factory is extremely decorous.
Terminal diameter is not identical, positive electrode is thicker negative pole is fine. Break off saw blade delimits terminal, qualitative harder for positive electrode. Terminal down-lead inserts yam, line week becomes green is positive electrode.
Join terminal two lead, immerge is rare vitriolic solution, generation bleb carries negative pole, extremely decorous without bleb.
10, the law that blow fire examines cell of accumulator simple case whether short circuit
Accumulator interior short circuit, happen in 9 case more. Short circuit of simple case batteries is denied, commonly used examination of the law that blow fire. With the root relatively blister copper lead, accept the order case batteries one extremely,
The hand takes copper cash other one aspect of the matter, brush quickly delimit another extremely. Lubricious scintilla of occurrence La Bai, be belonged to by check simple case good. Gules scintilla is to lack report, without scintilla already short circuit.
11, the law checks the phase voltage in smoking electric energy of two component three-phase expresses wiring
3 lines electric energy expresses three-phase, the phase voltage in smoking is checked. Changeless circumstance issues negative charge, the phase voltage in disconnecting line.
Watch electric energy to express movement, disc is turning slow half, exclusive validity wiring, otherwise wiring has a mistake.
12, whether does fist of planted agent of judgement microamper watch break a string
Microamper expresses coil to be connected, avometer cannot be measured sentence. Column of the wiring after microamper is expressed, verdigris lead is short had received, next jolty microamper watch, see the hand that express a head at the same time.
Slow swing scope is little, the coil inside the watch is in good condition. Swing more quickly substantially, the coil inside the watch already broke a string.
13, will analyse judgement breakdown according to state of frit silk fusing
Treat condition of frit silk fusing, judge the breakdown inside circuit. Appear frit silk Quan Rong explodes, serious overload or short circuit. Frit silk is mid fracture surface is small, normal overload time is long. Break near crimp bolt, installation is injured not impaction.
14, according to lubricious annulus the mark identifies resistor size
Finished product is small-sized resistor, lubricious annulus is nominal resistance. The first annulus decides lubricious annulus, stand by resistor brim annulus. Most one annulus is end deviation, reciprocal 2 annulus are multiple.
Block of the others lubricious annulus is worth annulus, state block is worth significance. Color patch color represents number, times several square values of 10. La Zi of olivine of palm blood orange, just a little thirty-four thousand five hundred and sixty-seven, grey 89 Bai Hei is 0, jin Yiyin 2 negative multiple.
15, line of insulation of inferior aluminium core identifies a way
Line of plastic insulation aluminous core, see the skin that feel core know actor of low quality. Silvery white of core line softness, inferior harder look sends black.
Cortical scenery is gorgeous imprint factory name, inferior stale does not have a label. Cortical core line contact is close, inferior a big core small pine.
16, the stand or fall that differentiates incandescent lamp bulb
Stand or fall of incandescent lamp bulb, soon fingerprint will differentiate. Bubble circle is bright and clean without sand holes, commodity label lettering is clear. Vitreous lampwick is not askew, filar hook tungsten filament is arranged all. Lamp holder is installed not askew, a bit tug does not feel loose.
17, the quality that differentiates transformer oil
Transformer is watched outside oil, new oil normally flaxen. Shallow red is shown after moving, oleaginous ageing color pales, intensity is different color is different, char is serious color is nigrescent.
Test tube fills oil to greet light to look, good oil is transparent have fluorescence. Do not have blue purple to glance, diaphaneity difference has a foreign body. Good transformer oily insipidity, or have taste of a bit kerosene.
Dry overheat anxious stink, serious ageing has tart flavor. The generation inside oil crosses electric arc, can smell acetylene flavour.
18, drop water detects electromotor temperature rise
Water of drop of electric machinery temperature rise is measured, a few water are sprinkled on housing. Risk steam not to have sound only, the electric machinery that be measured does not have overheat. The whistle when risking steam whistles noisy,
19, before three-phase electromotor did not install rotor, decide the simple method that change direction
Electromotor changes direction forecast, rotor was not installed decide law. Cupreous silk curves bucket form, stator internal diameter decides bucket way. Stator vertical stroke is put had secured, cotton thread well-bucket is put among them.
The bucket stops firm hind twinkling electrify, the bucket rotates to change direction surely namely.
20, intensity of electromotor insulation machinery standard of 4 class differentiate
Bad of electromotor insulation actor, mechanical intensity will measure. The sense organ diagnoses finger to press, law of differentiate of 4 grade level. Finger is pressed pressure flawless, insulation qualification feel is good.
Produce small crackle on time, insulation is in weak condition. Happen to be out of shape greatly on time, insulation is bad already stop to use.
21, feel lukewarm law detects electromotor temperature rise
Electromotor runs temperature, feel lukewarm law will detect. Hand thrum tries not to become aware very hot, the back of hand is smooth put housing. Touch for a long time the hand is erubescent, 50 degrees or so a bit hot.
The hand can keep two 3 seconds, 65 degrees are very hot. After the hand touchs, iron very, 75 degrees are amounted to extremely hot. It is difficult that the hand just touched bear, 85 degrees already overheat.
22, fuse frit provides fingerprint low pressure insulation place temperature fast fusing of the photograph that where to sentence
Low-pressure distribution screen dish go up, arrange many fuse. Fingerprint frit runs insulation department, frit of very hot hand is in charge of fuse-element to break.
23, the drop of discontinuous core breakdown that the hand helps electrical wiring law search flexible cord
Odd core oak covers soft electrical wiring, discontinuous core searchs a law in. Both hands holds a line cortical, removed more than 200 millimeter. Pull outside forcibly at the same time, chase paragraph of examination to look carefully.
Abrupt attenuate handles line way, it is spot of the trouble that break core.
If electric breakdown relies on direct perception of the person to cannot determine position, need have the aid of all sorts of instruments, appearance, value of the voltage to breakdown equipment, electric current, power, frequency, impedance, insulation, temperature, amplitude, rotate speed has an amount etc, in order to determine breakdown position.
A pithy formula of electrical engineering skill is bright handy of exercise of electrician of able to read aloud fluently!
1, electrical engineering 3 lines
Electrician holds 3 lines, live wire 0 lines lifeline, 3 front line are motivation, one fire 10 it is illume. Body allotment of labour provides 4 big, wire-cutter of electric knife bottle opener, contain spanner to wear exterior line, working whole journey stresses safety.
2, exterior line works
The exercise on lever gets setup, spanner of at somebody's convenience can be measured, space size should hold, uniform standard an appearance. Spur low pressure high a meter 5, low spur low pressure but 80 ① , spanner measures stringy rope range finding, one material is multi-purpose have safeguard.
Note: ? Jiu steel finishs tall, low-pressure horizontal stroke carries Zha? the distance between, 80 are 80cm.
3, indoor overhaul
The overhaul that check a line has want a way, contact contact weighs enumeration, check fountainhead fusing silk first, breakdown arranges a cane to feel melon. Fire does not shine is 0 lines, or it is switch accuses complex phase, have fire dim it is an induction, broke without fire without report.
4, value life
With weighing a talent originally artificially, others regard highly more self-love, always safety is paid no attention to, act recklessly of violate the rules and regulations can go out bad. Should know life, lose won't come back again, father high meticulous to the job, accompany you happily all one's life to be in.
5, learn gist of electrical engineering knowledge
Electrical engineering knowledge is really wonderful, microcosmic domain goes discussing, matter is small unfamiliar not witting, macroscopical universe photograph is compared. The heavenly bodies has each, follow the pattern not turn things upside down, electric origin looks for the root, get greatly think carefully to know.
6, electrical engineering exercise 3 lines 4 big
Electrician holds 3 lines, live wire 0 lines lifeline,
Much power of 3 front line, one fire 10 do illume.
Body allotment of labour provides 4 big, wire-cutter of electric knife bottle opener,
Contain spanner to wear exterior line, working whole journey stresses safety.
7, electrical engineering exercise plays sanxian
Electrical engineering exercise plays sanxian, appearance determines standard sound,
Dial beauty of flick away music, achieve gives society and homophonic.
Commonly used tool is ripe dial practice, play move 3 motivation to cry,
Illume sends light twice, worker of report of China much charming.
8, installation of exterior line erect
The exercise on lever gets setup, spanner of at somebody's convenience can be measured,
Space size should hold, uniform standard an appearance.
Spur low pressure high a meter 5, low spur low pressure but 80,
Spanner measures stringy rope range finding, one material is multi-purpose have safeguard.
9, estimation of distribution lead current-carrying capacity
Insulation lead is fully loaded with stream, lead is sectional multiply multiple,
2.5 multiply with 9, upgrade is decreased arrange date to go.
35 by 3.5, in pairs is become group reduce a point 5,
The temperature that wear a canal 89 fold, bare wire carries stream add an in part.
10, dc road 3 parameter
Dc road 3 parameter, voltaic voltage and resistor, voltaic I incoming telegram presses U, resistor R blocks electric current up.
Electronic flow makes electricity, voltage points to two difference more, resistor accord with Ou Miga, electric current installs V of A bend over to press.
11, knowledge of alternating current power
Communication power has 3 kinds, character expresses to also differ, inspect in S, without result Q, the meaning of P is have rendered great service. Power unit is what each, it is power together different, inspect result lack is not had in volt-ampere, but unit of have rendered great service is made of baked clay.
12, budgetary estimate of electric current of negative charge of commonly used and electric equipment
How is practical electric current begged, estimation method is pallet also, illume kilowatt 4.5, electric power kilowatt flows twice. Single-phase electric machinery is pressed 8 how, half as much again of three-phase electric heat, two-phase voltage 308, 2.7 how be electric welding.
13, treasure life to stress safety
With weighing a talent originally artificially, others regard highly more self-love, always safety is paid no attention to, act recklessly of violate the rules and regulations can go out bad. Should know life, lose won't come back again, father high meticulous to the job, accompany you happily all one's life to be in.
