What are the hazards of transformer oil leakage?

After the transformer leaks, there are the following consequences:

1. Oil-immersed transformer.

Oil has three main functions, one is insulation, the second is heat dissipation, the third is sealing, and the fourth is damping; When the transformer leaks, the oil can come out, and the water can go in, which will reduce the oil level in the transformer, and when the oil level is too low, the coil of the transformer will expose the oil surface, and the main problem is that the insulating oil will be damp, and the transformer coil will be damp, which will affect the overall insulation of the transformer.

At the same time, it will also affect the output of the transformer due to poor heat dissipation, and the life of the transformer will be affected when overheating; It will also increase the noise of the transformer in large short-circuit currents.

The transformer coil may be deformed due to excessive electrodynamic force during impact;

2. After the transformer oil seeps out, it will cause serious dirt around the seepage point, if this point is close to the live part, especially when the transformer inlet and outlet bushing has oil seepage, it will accumulate a layer of dirt on the casing, which is easy to cause a "pollution flash" accident when it is damp, that is, it is discharged along the outer surface of the transformer bushing, and it is more complicated to replace the transformer bushing, that is, there are bushing spare parts, and professionals also need to affect the power supply for a day.

1.The phenomenon of oil leakage in power transformers not only seriously affects the appearance, but also causes economic losses due to the need for power transformers to be shut down to eliminate leakage. If there are many oil stains on the ground foundation of the power transformer, it may also become a trigger.

2.Oil leakage will seriously interfere with the operation and maintenance personnel's monitoring and judgment of the sealing condition in the power transformer oil storage tank and the correctness of the oil level gauge indication.

3.After the oil level is lowered due to leakage, it may make live joints, switches, etc. operate without oil insulation, which may lead to breakdown, short circuit, burning, and even cause equipment**.

The transformer is one of the key electrical equipment of the distribution station, and the transformer can solve the problem of heat pipe heat dissipation in large space and the problem of high working voltage insulation layer of transformer, and is widely used. However, the problem of oil leakage, which is a common phenomenon in the operation of transformers, seriously endangers the safe operation of transformers. So can a transformer leak still work?

Let's first take a look at the consequences of a transformer oil leak

1.The oil leakage of the transformer not only seriously affects the appearance, but also causes economic losses due to the need for the transformer to be shut down and the leakage is eliminated.

2.Oil leakage will seriously interfere with the operation and maintenance personnel's monitoring and judgment of the sealing condition in the transformer oil conservator and the correctness of the oil level gauge indication.

3.After the oil level is lowered due to leakage, it may make live joints, switches, etc. operate without oil insulation, which may lead to breakdown, short circuit, burning, and even cause equipment**.

4.After the transformer leaks, the fully sealed transformer will lose its sealing state, and it is easy to reduce the insulation performance due to the invasion of air and moisture from the outside world, accelerate the aging of the insulation, and affect the safe and reliable operation of the transformer.

How to deal with transformer oil leakage, let's take a look at the specific treatment measures in combination with the case:

Due to the special working environment of the transformer, it is not allowed to shut down for a long time, so it cannot meet the needs of replacing new components. The use of Soray carbon nanopolymer material technology is a more effective way to solve the oil leakage of transformer, and its main feature is that some leakage points can be treated without stopping, and will not have any impact on the transformer shell itself and the transformer oil.

The harm of oil leakage in transformer disassembly must be great, because if this problem occurs in the transformer, the store inspection machine will definitely be damaged, and it will also be harmed, and it may burn down and cause a disaster.

First, if the transformer has long-term oil leakage or a large amount of oil leakage, there will be insufficient transformer oil volume, and when the oil level of the transformer in operation drops too much, it may lead to the occurrence of gas protection malfunction. When the transformer has a serious shortage of oil and the internal windings are exposed, it may cause insulation damage or even breakdown accidents, resulting in the shutdown of the transformer and affecting the reliability of the power. The leakage of the second shirt and transformer oil is easy to cause moisture to enter, causing the void part of the inner base of the transformer to be damp; 3. The oil leakage part of the transformer is easy to attach dust, which makes the appearance of a large area adhere to the oil, which greatly affects the appearance and brings difficulties to maintenance and maintenance; Fourth, leaking transformer oil wastes resources and pollutes the environment.

Summary. First, if the transformer has long-term oil leakage or a large amount of oil leakage, there will be insufficient oil volume of the transformer, and when the oil level of the transformer in operation drops too much, it may lead to the occurrence of gas protection malfunction. When the transformer has a serious shortage of oil and the internal windings are exposed, it may cause insulation damage or even breakdown accidents, resulting in the shutdown of the transformer and affecting the reliability of the power.

First, if the transformer has long-term oil leakage or large oil leakage, there will be insufficient oil volume of the transformer, and when the oil level of the transformer in operation drops too much, it may lead to the occurrence of gas protection malfunction. When the transformer has a serious shortage of oil and the internal windings are exposed, it may cause insulation damage, and even a breakdown accident will occur in the furnace, resulting in the shutdown of the transformer and affecting the reliability of the power.

2. The leakage of transformer oil is easy to cause moisture to enter, resulting in moisture inside the transformer; 3. The oil leakage part of the transformer is easy to adhere to the dust, which makes the surface of a large area adhere to the oil, which greatly affects the appearance of the burning eggplant and brings difficulties to the maintenance or inspection; Fourth, leaking transformer oil wastes resources and pollutes the environment.

A transformer is a device that uses the principle of electromagnetic induction to change the lead-beat AC voltage, and the main components are the primary coil, the secondary coil and the iron core (magnetic core). The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage regulation (magnetic saturation transformer), etc.

1] Transformers can be divided into distribution transformers, power transformers, fully sealed transformers, combined transformers, dry-type transformers, oil-immersed transformers, single-phase transformers, Huaichai electric furnace transformers, rectifier transformers, reactors, anti-interference transformers, lightning protection transformers, box-type substation test transformers, corner transformers, high-current transformers, silver limb excitation transformers, etc. [1]

There are two main causes of transformer leakage: on the one hand, there are problems left over in the process of transformer design and manufacturing process; On the other hand, it is due to leakage caused by improper installation and maintenance of transformers. The main leakage parts of transformers often appear in radiator interfaces, flat disc valve caps, casings, porcelain bottles, welds, sand holes, flanges and other parts.

The leakage of transformer is mainly concentrated in the following parts: the parts that account for more than 50% of the total leakage point are radiator interface, flat disc valve cap, radiator bulkhead, and connecting flange seal; 16% is casing and porcelain bottle leakage; 12% is leakage from gas relay interfaces. In addition, there are some defects in the transformer manufacturing process, such as welding imitation without slip joints, sand holes, etc.

1. Oil leakage treatment at the welding:

Causes of the problem:

Mainly due to poor welding quality, there are defects such as virtual welding, desoldering, welding, sand holes, etc., the transformer is covered with flux and paint when it leaves the factory, and the hidden dangers will be exposed after operation, and the electromagnetic vibration will cause the welding to crack and cause leakage.

Ways to solve the problem:

For those who have leakage, first find out the leakage point, and do not omit it. It is necessary to continuously clean, find out the source of leakage along the oil traces, and seal the leakage point with water-oil compatibility supplement, and achieve the purpose of long-term treatment of leakage after curing.

2. Oil leakage from iron castings.

Causes of the problem:

The main cause of oil leakage is sand holes and cracks in iron castings.

Ways to solve the problem:

For crack leakage, drilling crack holes is a way to eliminate stress and avoid elongation. According to the condition of the crack, the lead wire can be driven into the leakage point or riveted with a hand hammer. Then clean the leakage point and seal it with water-oil compatibility supplement and titanium steel glue.

3. Oil leakage from the radiator.

Reasons for the formation of the problem:

The heat pipe of the radiator is usually made of stamping after flattening the steel pipe with seams, and the oil leakage often occurs in the bending part and the welded part of the heat pipe, which is because when the heat pipe is stamped, the outer wall of the pipe is under tension, and the inner wall is under pressure, and there is residual stress for waxing.

Technical solutions to problems:

After determining the leakage site, appropriate surface treatment is carried out, first using titanium steel glue for rapid sealing and treatment, and then reinforcing with water-oil compatible repair agent after curing.

Find out why and where.

Before dealing with oil seepage, it must be carefully analyzed to find out the cause of the leak and the exact leakage point. For the existing oil stains, first clean them with a small flat shovel and wire brush, then clean them with xylene, rinse them with clean water, and finally wipe them repeatedly with a clean cloth to find the exact location of the leakage point.

Handling scenarios. Transformer leakage can be roughly divided into sealing leakage and welding leakage. Dealing with seal leakage, mainly to improve the quality of sealing, such as casing, oil mark, radiator valve, large cover, on-load switch and other places containing seals, if the fastening screw is invalid, the sealing ring can be replaced or re-glued and sealed; To deal with welding leakage, repair welding can be adopted. Regardless of the type of oil that is being treated, it is forbidden to use the thick material method or the lashing method.

The pressure-bearing area of the sealing rubber of the seal should be adapted to the force of the screw, otherwise it is difficult to compress; When replacing the oil plug rubber sealing ring, the valves and channels at the inlet of the part should be closed, and the seal should be replaced under the condition that the negative pressure is maintained to a large amount of oil, and the seal should have good oil resistance and anti-aging performance, good elasticity and mechanical properties, and the sealing material should avoid using materials such as asbestos packing and cork mat as much as possible.

Parts with poor structure or unreasonable sealing methods, such as radiator and oil purifier connection flange strength is not enough, easy to deform when tightening bolts, so that the flange can not be tightly pressed gasket, should be modified or replaced. The crimping plane at the seal should be smooth and clean, and it is best to apply a layer of adhesive glue such as PVC, varnish, etc. when placing the rubber pad.

When a leak is found in the upper part of the welding transformer oil tank, only a small amount of oil needs to be discharged to weld it; When leakage is found in the lower part of the oil tank, due to the large waste of oil discharge in the core and limited by the on-site conditions, it can be welded with oil. Repair welding with oil should be carried out under the condition that the oil leakage is not significant, otherwise the vacuum should be welded after the vacuum discharge method caused by negative pressure, and the vacuum degree of negative pressure should not be too high, and the internal and external pressure should be equal to avoid inhaling molten iron.

Gas welding is generally forbidden to be used for oil repair welding; Welding selection of thinner electrodes, such as electrodes is appropriate; When repairing welding, the oil stains on the welding part should be cleaned, and it is best to rinse with alkaline water and then wipe dry; During the welding process, attention should be paid to prevent penetration and ignition, and the welding part must be below the oil level; Intermittent and rapid spot welding is used when welding, and the arc time should be controlled within 10s and 20s, and long-term continuous welding is absolutely not allowed.

When the pores with serious oil leakage can be plugged or riveted with iron wires before welding; Cooling and protection measures should be taken when welding near sealing rubber gaskets or other vulnerable parts.

The sand hole on the sand hole casting can be plugged by pressure with Diyou No. 1 plugging glue, and after the blockage, pay attention to reinforcement, and then use a hair dryer to blow and bake for 5min 15min until it is cured. When plugging the leak, the oil stains should be wiped clean first.

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Hello, I'm glad to answer for you. When a transformer burns out, it can lead to oil leakage due to excessive temperature in the transformer windings, which causes the transformer paint to age and crack, and form an oil leak on the outside of the transformer. At this time, the crack should be stopped immediately and overhauled or replaced.

At the same time, because the transformer oil is more flammable than the disadvantage, if the oil leakage in the leased belt hole encounters an ignition source, it may cause a fire, so we must pay attention to safety when dealing with it.

Summary. Dear, I'm glad to answer for you: Can a transformer cause an oil leak after it burns out: Can it cause an oil leak The transformer oil leakage also exposes the transformer oil part to the air, and over time, the oil exposed to the air will cause the deterioration of the transformer oil and affect the health of the equipment.

Dear, I'm glad to answer for you: Can the transformer cause oil leakage after it burns out: Can it cause oil leakage The transformer oil leakage also exposes the transformer oil part to the air.

The quality of the tap-changer is poor, the structure is unreasonable, the pressure is not enough, the contact can not be relied on, the position of the external word wheel is not completely consistent with the actual position of the inside, causing the position of the star-shaped moving contact to be not completely contacted, the dislocated dynamic and static contacts make the insulation distance between the two taps smaller, and under the action of the electric potential between the two taps, a short circuit or ground discharge occurs, and the short-circuit current will soon burn out the tap wire turn, and even lead or rough disturbance to damage the entire winding.