? (1) Guangzhou kangte generator does not operate according to the specified technical conditions. If the stator voltage is too high, the iron loss will increase; When the load current is too large, the copper loss of stator winding increases; The frequency is too low, which slows down the speed of the cooling fan and affects the heat dissipation of the generator; The power factor is too low, which increases the excitation current of the rotor and leads to the rotor heating. Check whether the indication of monitoring instrument is normal. If there is any abnormality, necessary adjustment and treatment should be made to make the generator run according to the specified technical conditions.
? (2) The three-phase load current of Guangzhou Kangte generator is unbalanced, and the overload one-phase winding will overheat; If the difference between the three-phase currents exceeds 10% of the rated current, it is a serious phase current imbalance, which will produce a negative sequence magnetic field, increase the loss, and cause the components such as pole windings and ferrules to heat up. The three-phase load should be adjusted to keep the phase current as balanced as possible.
? (3) Experience of GAC Conte generator: The air duct is blocked by dust, and the ventilation is poor, which makes it difficult for the generator to dissipate heat. Dust and grease in the air duct should be removed to make the air duct unobstructed.
? (4) Experience of Guangzhou Kangte generator: The inlet air temperature is too high or the inlet water temperature is too high, and the cooler is blocked. The temperature of inlet air or water should be lowered to clear the blockage in the cooler. Before the fault is eliminated, the generator load should be limited to reduce the generator temperature.
? (5) If the bearing is oiled too much or too little, it should be oiled according to regulations, which is generally 1/2 ~ 1/3 of the bearing cavity (the upper limit is low speed and the lower limit is high speed), and it is advisable to not exceed 70% of the bearing cavity.
? (6) Experience of Guangzhou Kangte Generator: Bearing wear. If the wear is not serious, the bearing will overheat locally; If the wear is serious, the stator and rotor may rub, resulting in overheating of the stator and rotor. Check the bearing for noise. If there is friction between stator and rotor, immediately stop the machine for maintenance or replace the bearing.
? (7) Experience of Guangzhou Kangte Generator: The insulation of stator core is damaged, which leads to short circuit between pieces, which leads to the increase of eddy current loss of core and heating, and even damages the stator winding in severe cases. Stop the machine immediately for maintenance.
? (8) Experience of Guangzhou Kangte Generator: The parallel conductor of stator winding is broken, which increases the current of other conductors and generates heat. Stop the machine immediately for maintenance.
2. Experience of Guangzhou Kangte generator: the neutral line voltage of the generator is abnormal.
? (1) experience of Guangzhou kangte generator: under normal circumstances, the voltage is between one volt and several volts, so there is no danger, and there is no need to deal with the extremely low voltage caused by the influence of higher harmonics or manufacturing process, uneven air gap and unequal magnetic potential at each pole.
? (2) Experience of Guangzhou Kangte Generator: The generator winding is short-circuited or poorly insulated from the ground, and the performance of electrical equipment and generator is deteriorated and prone to fever, so it should be repaired in time to avoid the accident from expanding.
? (3) Experience of Guangzhou Kangte Generator: There is no voltage between neutral line and ground when there is no load, but there is voltage when there is load, which is caused by three-phase imbalance, so the three-phase load should be adjusted to make it basically balanced.
3. Experience of Guangzhou Kangte generator: generator overcurrent.
? (1) experience of GAC conte generator: the load is too large, so the load should be reduced.
? (2) Experience of Guangzhou Kangte Generator: If there is a phase-to-phase short circuit or grounding fault in the transmission line, the line should be overhauled, and it can return to normal after the fault is eliminated.
4. Guangzhou Kangte generator experience: the terminal voltage of the generator is too high.
? (1) Guangzhou kangte generator experience: the grid voltage of generators connected in parallel with the grid is too high, so the voltage of generators connected in parallel should be reduced.
? (2) Experience of Guangzhou Kangte Generator: Overexcitation caused by excitation device failure, so the excitation device should be overhauled in time.
5. Insufficient reactive power
Because the voltage source compensation of the excitation device with compound excitation is insufficient, it can't provide the excitation current needed for armature reaction, which makes the generator terminal voltage lower than the grid voltage and can't deliver the rated reactive power. The following measures should be taken:
? (1) Connect a three-phase voltage regulator between the generator and the excitation reactor to increase the terminal voltage of the generator and gradually increase the magnetic potential of the excitation device.
? (2) By changing the phase between the voltage magnetic flux potential of the excitation device and the terminal voltage of the generator, the synthesized total magnetic flux potential is increased, and the resistors of several thousand ohms and 10W can be connected in parallel at both ends of each phase winding of the reactor.
? (3) Experience of Guangzhou Kangte Generator: Reducing the resistance of rheostat can increase the excitation current of generator.
6. Experience of insulation breakdown and short circuit of stator winding of Guangzhou Kangte generator.
? (1) Guangzhou kangte generator experience: the secondary winding is damp. For generators that have been stopped or overhauled for a long time, the insulation resistance should be measured before they are put into operation, and those who fail are not allowed to be put into operation. The generator affected with damp should be dry.
? (2) Winding insulation breakdown or mechanical damage caused by winding defects or improper maintenance process. Insulation materials should be selected according to the specified insulation grade, and winding embedding and paint dipping and drying should be carried out in strict accordance with the process requirements.
? (3) The experience of Guangzhou Kangte generator: the winding is overheated. Overheating of insulation will reduce insulation performance, and sometimes it will cause rapid breakdown of insulation at high temperature. Daily patrol inspection should be strengthened to prevent overheating of various parts of the generator and damage to winding insulation.
? (4) Insulation aging. General generator operation 15 ~ 20 years, winding insulation aging, electrical performance changes, and even insulation breakdown. Do a good job in generator maintenance and preventive test. If unqualified insulation is found, defective winding insulation should be replaced or windings should be replaced in time to prolong the service life of the generator.
? (5) Experience of Guangzhou Kangte Generator: Foreign metal objects enter the generator, so don't leave metal objects, parts or tools in the stator hole after repairing the generator; Fasten the binding line of the rotor and fasten the end to avoid loosening due to centrifugal force.
? (6) Overvoltage breakdown: 1) The line was struck by lightning, but the lightning protection was not perfect. Lightning protection facilities should be improved. 2) Misoperation, such as raising the generator voltage too high when there is no load. The booster of the generator should be carried out in strict accordance with the operating procedures to prevent misoperation. 3) generator internal overvoltage, including operating overvoltage, arc grounding overvoltage and resonance overvoltage, should strengthen the preventive test of winding insulation, timely find and eliminate the defects of stator winding insulation.
7. Experience of Guangzhou Kangte generator: stator core is slack.
? Due to improper manufacture and assembly, the iron core is not fastened properly. If the whole iron core is loose, for a small generator, two iron plates smaller than the inner diameter of the stator winding end can be padded on the stud to fasten the iron core. After restoring the original state, tighten the original clamping bolt of the iron core. If the local iron core is loose, silicon steel sheet paint can be coated between the loose sheets first, and then hard insulating materials can be pumped into the loose parts.
8. Experience of Guangzhou Kangte Generator: Short circuit between iron sheets.
? (1) Guangzhou kangte generator experience: the core lamination is loose, and the insulation is damaged by the vibration of the core when the generator is running; If the insulation part of iron filings is damaged or the iron core is overheated, the insulation will age, and the treatment will be carried out according to the method in the original scheme.
? (2) Experience of Guangzhou Kangte generator: there are burrs on the edge of iron filings or mechanical damage during maintenance. Remove burrs with a fine file, trim the damaged area, clean the surface, and then apply a layer of silicon steel sheet paint.
? (3) Experience of Guangzhou Kangte Generator: If the iron core is short-circuited by solder or copper particles, the metal solder joint should be scraped or chiseled, and the surface treatment should be done well.
? (4) Experience of Guangzhou Kangte Generator: The winding is short-circuited by arc light, which may also cause short-circuit of iron core. The burnt part should be removed with a chisel and the surface should be well treated.
9. Experience of Guangzhou Kangte Generator: The generator lost remanence when it was started, so it could not generate electricity.
? (1) Experience of GAC Conte generator: After shutdown, the remanence is often lost, because the material used in the exciter pole is close to low carbon steel, and the remanence is less. When there is no current in the excitation winding after shutdown, the magnetic field disappears, and the battery should be magnetized before power generation.
? (2) Experience of Guangzhou Kangte Generator: When the magnetic pole of the generator loses magnetism, DC current greater than the rated current should be introduced into the winding to magnetize, which can restore sufficient remanence.
10, Guangzhou kangte generator experience: the excitation reactor temperature of automatic excitation device is too high.
? (1) experience of GAC conte generator: the reactor coil is partially short-circuited, so the reactor should be repaired.
? (2) Experience of Guangzhou Kangte Generator: The air gap of the magnetic circuit of the reactor is too large, so the air gap of the magnetic circuit should be adjusted.
1 1. Guangzhou kangte generator experience: after the generator is started, the voltage will not rise.
? (1) Guangzhou kangte generator experience: the excitation circuit is open and the voltage cannot rise. Check whether the excitation circuit is disconnected and in good contact.
? (2) The experience of Guangzhou Kangte generator: the remanence disappears. If the exciter voltmeter does not indicate the disappearance of remanence, the exciter should be magnetized.
? (3) Experience of Guangzhou Kangte Generator: The polarity of the exciter magnetic field coil is reversed, and its positive and negative connecting wires should be reversed.
? (4) Experience of Guangzhou Kangte Generator: When the generator was repaired and tested, the magnetic field coil was mistakenly connected to DC, resulting in the disappearance or reversal of remanence, so it should be re-magnetized.
The silicon steel sheets of Guangzhou Kangte generator are all made of Beijing Shougang high-quality silicon steel sheets, and each silicon steel sheet of stator core is completely stamped at one time, and there is no waste splicing.
Stator coils are all made of Beijing Datong brand circular copper wire, with 72 turns of 2/3 pitch brushless permanent magnet self-winding.
Excitation, Rao method with 2/3 pitch of 72 turns can effectively suppress harmonic generation, and permanent magnet excitation can greatly improve the starting torque, but the cost is about 6% higher than the ordinary 5/6 pitch of 48 turns on the market.
Take a 500kW generator as an example, if copper-clad aluminum wire is used, the difference can reach 1 1000 yuan, and if steel wire with 5/6 pitch and 48 turns is used, the difference can reach 4000 yuan.
Rotor bearing is the only worn part of generator. The gap between rotor and stator is very small, and the bearing is not used well. After grinding, the rotor is easy to rub against the stator, commonly known as "rubbing the bore", which will produce high heat and burn out the generator. The generator selected by Guangzhou Kangte adopts high-precision machine tool bearings with high strength and high wear resistance, which greatly prolongs the service life.
3. Control system
The main module of Guangzhou Kangte generator control system is imported from British Deepwater Company, which is the best control module at present, with the advantages of stable operation, reliable protection and extremely low failure rate. The price difference of domestic controller module reaches about 3000 yuan.
All electrical components adopt international ABB brand, and the main output switch adopts domestic first-line Tianzheng brand. Take a 500kW generator set as an example. If domestic electrical components are used, the price difference will reach 3,000 yuan.
4. Accessories
Guangzhou kangte diesel generator set as standard configuration by? Radiator, oil tank, chassis, storage battery, battery lead, muffler, damping pad, air filter, oil filter, corrugated pipe, smoke exhaust pipe, connecting flange and oil pipe. After the diesel generator set produced by Guangzhou Kangte arrives at the user's site, there is no need to buy any other auxiliary parts. Connect cables and add diesel and water to generate electricity.
The cooling water tanks of Guangzhou Kangte are all made of copper pipes, and the cooling gap is 0.8CM in strict accordance with the national standard to ensure the cooling effect and service life. However, most of the manufacturers are aluminum tube water tanks, lCM with cooling gaps, and even 500KW generators with a length of more than 1.2 cm. For example, the price difference can reach 3,000 yuan.
The oil tank of Guangzhou Kangte generator set is welded by cold-rolled plate, vertical and cylindrical, with oil filler, oil drain valve, liquid level display, oil pipe and oil pipe clamp, and it is fully equipped and ready to use.
Guangzhou Kangte generator set, equipped with honeycomb industrial muffler, is produced by our company's patented technology, which has obvious noise reduction and environmental protection characteristics.
The chassis of Guangzhou Kangte generator set is made of welded channel steel. Compared with the chassis made of steel plates from most manufacturers, it has the characteristics of high strength, impact resistance, handling resistance and protection of the concentricity of the generator set. Take a 500Kv generator as an example. If all steel plates are used, the price difference can reach l000 yuan.
Guangzhou Kangte's 20-year development has condensed a group of high-quality engineers and skilled workers. At present, we have 2 senior engineers, 7 engineers, 5 senior technicians and 26 technicians. The technicians are stable and have served in our company for more than 5 years.
Guangzhou Kangte strictly implements the national quality standards and tracks the materials from the beginning of entering the factory. Every working procedure has a person directly responsible, so that responsibility goes to people and quality goes to people.
Guangzhou Kangte has the most complete inspection platform for generator sets in South China, which can realize 1000kW single machine, 5,000 kW on-line fully simulated field test of inductance, capacitance and resistance, and 2400KW single machine, unlimited on-line fully simulated side test.
Guangzhou kangte generator set has passed the full load test for more than l hours before leaving the factory. Main parameters such as sudden drop of 50% load, sudden drop 100% load, sudden drop of 50% load, sudden drop 100% load, voltage stabilization time, voltage fluctuation range, frequency stabilization time, frequency fluctuation range, active and reactive power are all displayed visually in digital form. You can hold a book.
High-quality talents have created high-quality products, and high-standard testing has become the brand of Guangzhou Kangte. Since the new century in 2000, Guangzhou Kangte has been at the forefront of the industry for many years. Since 2008, Guangzhou Kangte's sales have exceeded 1 billion for five consecutive years, becoming the flagship of the industry.
Any technician in our company can enjoy the treatment of senior engineer when he goes to a peer company. A large number of technical articles and materials of our company were plagiarized, and some colleagues put our company's technology on the website, and even accidentally removed our company's name, making a joke.