1 abnormal sound

(1) when the sound is large and noisy, it may be the problem of baoding oil-immersed transformer iron core. For example, clamps or the screw that presses iron core is loosened, the indication of the instrument is general and normal, the color of insulation oil, temperature and oil level also do not have big change, should stop transformer at this moment run, undertake checking.

(2) there is the boiling sound of water sandwiched in the sound system, which emits "purr purr" bubbles to escape sound. It may be that the winding has a more serious fault, and the parts around it are seriously heated to make the oil and gas change. Poor contact of tap switches and local points with severe overheating or short circuit between turns of baoding oil-immersed transformer, will send out this sound. At this point, the transformer should immediately stop operation, maintenance.

(3) when the sound is accompanied by explosions, which are both large and uneven, it may be that the insulation of baoding oil-immersed transformer body breaks down. At this time, the oil-immersed transformer should be stopped for maintenance.

(4) when the sound is sandwiched with the "squeaking" sound of discharge, the surface partial discharge may occur on the transformer body or sleeve. If it is the casing problem, in bad weather or at night, can also see corona glow or blue, purple sparks, at this time, should clean the casing surface dirt, and then coated with silicone oil or silicone grease coating. At this point, to stop the transformer, check whether the distance between the iron core grounding and the live parts to the ground meets the requirements.

(5) audio clip has the continuous, regular impact or friction, some parts may be baoding oil-immersed transformer caused by core vibration mechanical contact, or abnormal noise caused by electrostatic discharge, and all kinds of gauge meter reading and temperature had no reaction, although this kind of noise anomaly, but without harm to run, don't have to immediately stop operation, should be ruled out in maintenance planning.

2 temperature anomaly

Baoding oil-immersed transformer in the load and heat dissipation conditions, the environment temperature is unchanged, than the original same conditions when the temperature is high, and the trend of increasing, is also an abnormal increase in transformer temperature, and the increase in the extreme temperature is also a symbol of transformer fault.

The causes of abnormal temperature rise are as follows:

(1) transformer turns, between layers, between the short circuit;

(2) transformer core local short circuit;

(3) due to magnetic leakage or eddy current caused by heat tank, box cover;

(4) long-term overload operation, accident overload;

Heat dissipation conditions deteriorate.

When the temperature abnormality of baoding oil-immersed transformer is found in operation, the reason should be found out first, and then the corresponding measures should be taken to eliminate the temperature. If it is caused by the internal fault of the transformer, the operation should be stopped and maintenance should be carried out.

3 oil injection explosion

Spray explosion is the cause of transformer internal fault and short-circuit current to make the rapidly aging, high temperature electric arc, and relay protection device and failed to cut off the power and make fault persist for a long time, make the internal pressure sustained growth, high pressure oil and gas from the blast pipe or casing strength weakness other gushing form the accident.

(1) insulation damage: short-circuit between turns and other local overheating causes insulation damage; The insulation of baoding oil-immersed transformer is damaged by dampness due to water ingress. Lightning and other overvoltage insulation damage and other internal short circuit caused by the basic factors.

(2) arc generated by wire break: poor welding of wire group conductors, loose connection of lead wires and other factors may cause wire break under the impact of large current, and high temperature arc generated at the break point will cause oil and gas generation and increase internal pressure.

(3) voltage-regulating tap switch fault: the voltage-regulating segment coil of the high voltage winding of the distribution transformer is connected together by tap switch. Tap switch contacts are connected in series in the high voltage winding circuit, and the winding passes load current and short-circuit current together. For example, tap switch moves and moves to touch the hair heat, jump the fire and start the arc, so as to short-circuit the voltage-regulating segment coil.

4. Serious oil leakage

The leakage of oil in operation of baoding oil-immersed transformer is quite common, and the oil level is within the specified range. However, transformer oil leakage is serious, or continuous from the damage continued overflow, so that the oil level meter has not seen the oil level, at this time should immediately stop the transformer operation, leakage and refueling.

The oil level of transformer oil is too low, making the bushing lead and tap switch exposed to air, the insulation level will be greatly reduced, so it is easy to cause breakdown discharge. Causes of transformer leakage include: weld crack or seal failure; Vibration during operation; External force impact; The oil tank is badly corroded and damaged, etc.

Casing flashover

The bushing of baoding oil-immersed transformer is fouled, which causes pollution flashover in heavy fog or light rain, and causes single-phase grounding or phase short-circuit on the high-pressure side of transformer. Damage of bushing of baoding oil-immersed transformer due to external force impact or mechanical stress and thermal stress is also the factor causing flashover. Foreign matters falling on the transformer box cover, such as strong wind blows branches falling on the box cover, causing casing discharge or interphase short circuit.

The above judgment of transformer's sound, temperature, oil level, appearance and other phenomena on distribution transformer's fault can only be used as an intuitive preliminary judgment on the spot. Because, transformer internal fault is not only a single aspect of the intuitive reflection, it involves many factors, sometimes even appear false. When necessary, the characteristic test and comprehensive analysis of baoding oil-immersed transformer must be carried out, so as to find out the fault cause accurately and reliably, judge the nature of the accident, and put forward a complete and reasonable treatment method.

Baoding zhongyi electric material manufacturing co., ltd. is a professional transformer manufacturer in baoding transformer factory, with professional production equipment, lifting, tooling and testing equipment, established a perfect quality management system, product performance indicators have reached the standard.

The company's main products: baoding dry transformer, baoding box transformer, baoding oil-immersed transformer, baoding high and low voltage complete sets of equipment. I companies to follow "detail decides success or failure, honesty molded the future" of the enterprise purpose, adhere to "quality measuring market, seek development by innovation, to management for efficiency" business philosophy, to make my company's products are widely used in power plant, chemical, construction, mining, metallurgy, rail transportation and other industries, to meet the needs of various users, my company rely on superior product quality, thoughtful service, won the trust of our customers.