What are the influencing factors of insulator breakdown?

The influencing factors of insulator breakdown are as follows.

It is possible that the current is too high, which causes the insulation to heat up, resulting in a breakdown, or the insulator breakdown caused by a voltage mismatch.

Insulation breakdown is caused by these reasons: The causes of insulation breakdown caused by insulation aging can be summarized as: electricity, heat, chemical, mechanical, humidity, etc.

1) There is dirt on the surface of the insulator and the porcelain skirt, and the voltage strength is reduced after being wet, and a discharge loop is formed on the surface of the insulator, which increases the leakage current, and when it reaches a certain value, it causes the surface breakdown discharge.

2) Although the dirt on the surface of the insulator is very small, due to some kind of overvoltage in the power system, the surface of the insulator is flashed and discharged under the action of overvoltage. The treatment method is: after the flashover discharge of the insulator, the surface insulation performance of the insulator decreases greatly, and it should be replaced immediately, and the non-flashover discharge insulator should be cleaned, and it must be disposed of under safe conditions.

For porcelain insulators, when there are defects such as fine cracks in the porcelain parts of the insulator head, with the invasion of moisture in operation, the insulation resistance of the insulator head decreases (forming a zero-value insulator), once the insulator string suffers from lightning strikes or flashovers caused by other reasons, due to the extremely small resistance of the head and the relatively large resistance along the long discharge distance along the umbrella plate, most of the energy is discharged from the discharge channel of the head of the porcelain insulator, and the heat generated when the arc passes through the head of the insulator makes the insulator explode and produce a broken string.

The influencing factors of insulator breakdown, such as too high voltage, too large current, and then the aging of the insulation layer in the middle.

manufacturing quality problems, external (mechanical) damage (or destruction); Aging; overvoltage breakdown; wire fittings are heated and insulated and exploded at overtemperature; Damp; Dust pollution, filth, discharge, breakdown, etc.

The quality of the insulator itself is not good, the dielectric strength of the material is not up to standard, the bubbles caused by the process, the surface is dirty, damp, and it is caused by overvoltage.

The factors that affect the breakdown of the insulator, the insulation capacity, the strength of the breakdown pressure, and the magnitude of the voltage time.

These three aspects can affect the breakdown effect.

There are some environmental factors influencing breakdown this year, and some temperature and so on.

The factor that arises is the problem of its material, and the characteristics of its material, which is his reason.

The influencing factors of this breakdown are too high voltage or the quality of the Juanzi product, or the distance is not enough.

The reason for the breakdown of insulators is that excessive current in the insulator connection circuit will cause breakdown.

And this can also happen when there are too many loaded electrical appliances.

There are many factors influencing the breakdown of insulators, which may be due to climate reasons or because of the medium he is exposed to.

What are the influencing factors of insulator breakdown, and there are many of these factors, because if his insulator is generated, his factor is that all aspects are not in place, which will affect this factor.

It is mainly dealt with by the strength of voltage and current, so there are still many situations that affect him, and it should be dealt with according to his situation.

The most important factor in the insulator's chicken pen phenomenon is the insulator coin caused by excessive voltage. High voltage breakdown.

This has a lot of effects, such as being able to penetrate an object, and after penetration, a thing of this size will appear like a hole.

The influencing factor of the breakdown of insulation products is that people who prevent electricity from reaching must use bakelite.

Oh, and there are many factors that affect him, including the temperature index and the hardness of some of his objects.

Well, the factors that affect the plan of the insulator, what are the breakdown of the coil, that is, it may be the current, and the transistor is instantaneously discharged.

Factors such as the speed of light and the time gap are the main points of influence.

There are many reasons for this, but the main reason is that it has conductors, conductors that have been produced.

The influencing factors of insulator production breakdown, this is a difference in the production process, and then it will have an impact.

The main thing is that it is a fundamental factor of oneself first, and there is also a destination for the protection of behavior.

Everything that is round is broken down because the current is too high.

What are the factors that affect the calculation of atom production? That is, it is not insulated, and the phenomenon of discharge is generated.

What are the influencing factors of breakdown of my insulator? I think that the over-coincidence voltage will break down the insulator, and that's the main reason.

There must be some of these factors related to the condition or some environment.

The insulator produces a few inches of sound factors, firstly, the first sealing performance is not good, and secondly, it is also possible.

InsulatorsThe voltage at the time of breakdown is calledBreakdown voltageWrong. It should be correct to say that the lowest voltage that can break down an insulator is called the breakdown voltage. The voltage at which the insulator is broken down varies depending on the insulator.

The voltage at which the insulator is broken down depends on the material of the insulator itself, the geometry of the insulator itself, and so on. Different materials, different geometries, different ways of applying voltage, and different test environmental conditions will directly affect the breakdown voltage.

The voltage at which the insulator is broken downIt depends on the withstand voltage of the insulator, if the withstand voltage of the insulator is 250 volts, then its breakdown voltage must exceed the voltage of 25o volts, and the other is that the withstand voltage of the insulator is 500 volts, then if the insulator is broken down, then at this time, the voltage of the broken down insulator must be higher than the voltage of 5oo volts.

Voltage breakdown refers to the fact that the dielectric will lose its dielectric properties and become a conductor under the action of a sufficiently strong electric field, which is called dielectric breakdown, and the corresponding voltage is called the breakdown voltage. In this experiment, it is possible to determine the voltage at which the voltage breaks down the sample, which is the upper limit of the sample. When designing a product, the upper limit value obtained by the high voltage resistance test can know the compressive performance of the material, however, there are many factors that affect the breakdown voltage, which are divided into the state of the specimen itself and the test conditions.

Influencing factors——

1. The factors affecting the breakdown voltage of the state of the specimen itself are more typical

a.Thickness of the sample: The thickness of the sample is uneven, the breakdown voltage at each point will be different, and the breakdown voltage will often be greater in the thick area than in the thin place.

b.Surface condition of the specimen: The presence or absence of porosity in the specimen also affects the measurement of breakdown voltage. If there are pores in the sample, the pores in the sample may distort the electric field, and the measured breakdown voltage will be larger than the actual voltage.

c.Mechanical stress: When the sample is subjected to too much mechanical stress, the medium is subjected to mechanical stress, and when the sample is subjected to too much mechanical stress, it may cause a slight crack on the surface of the sample, so that the measured breakdown voltage is small.

d.Sample pretreatment: The same type of sample, the conditions of pretreatment are different, which may also make the measured breakdown voltage deviate from the actual value, so when encountering samples that need to be pretreated, ensure that the samples of the same group should be pretreated in the same environment.

2. Due to the different test conditions of the sample, the factors that cause the error of breakdown voltage measurement are:

Because, when the voltage acts on the sample, it takes a certain amount of time to break down the sample. If the action is not long enough, the sample may not be broken down, even if the actual breakdown voltage value is reached.

b.Boost rate: If the boost rate is too fast, the instrument may not be able to collect the breakdown voltage of the sample itself. For example, if the breakdown voltage of a sample itself is 8kV and the boost rate is set at 3kV min, this can also lead to errors in the results.

c.Frequency of voltage: When operating at high frequencies, part of the energy is converted into heat energy (medium heating), which accelerates the breakdown of the sample, and the measured value may be smaller than the actual value.

d.Environmental influences: For the measurement of breakdown voltage, there are also environmental influences (humidity, temperature), as mentioned in point 3, the temperature is too high, which accelerates the voltage breakdown of the sample, resulting in a deviation between the actual and measured values of the sample; Excessive humidity may cause moisture in the sample.

When the sample is wet, the sample contains more water, and water conducts electricity more easily than the sample, and the measured breakdown voltage will be smaller than the actual value.

The above is a part of the factors that affect the breakdown voltage, in order to reduce the error caused by these factors, we need to ensure that the surface of the sample is smooth and the thickness of the sample is as flat as possible.

Breakdown faults in line insulators typically occur in the following situations:

1.Overvoltage conditions, such as lightning strikes, operation errors, equipment failures, etc.

2.The surface of the insulator is filthy and rent-imitating, such as dust, moisture, water mist, corrosion, etc.

3.The thermal expansion and contraction caused by the change of ambient temperature can cause cracks or damage to the socks before insulation.

4.Mechanical forces, such as object impact, vibration, wind, etc.

5.The service life meets or exceeds the design life.

When an insulator suffers from one or more of the above conditions, it may cause it to fail and cause breakdown failure. Such faults often cause power outages on the line, causing significant economic and social impacts, and even endangering the safety of personnel.

The causes of insulation breakdown caused by insulation aging can be attributed to: electricity, heat, chemistry, mechanical force, humidity, etc.

Electrical Aging The insulation of power equipment will be affected by the working voltage during operation. Under long-term operating voltages, if insulation occurs, local damage to the insulation material will occur (see ). If the insulation structure is too large, the insulation will be damaged due to overheating under the action of long-term working voltage.

Under the action of lightning overvoltage and operating overvoltage, local damage can occur in the insulation. Later, when the overvoltage is applied, the damage gradually expands, eventually leading to a complete breakdown.

Thermal aging The insulation temperature of power equipment increases due to the high temperature of the surrounding environment during operation, or due to the heating of the power equipment itself. Under the action of high temperature, the mechanical strength of the insulation decreases, the structure is deformed, the material loses its elasticity due to oxidation and polymerization, or the insulation breakdown and voltage drop due to the cracking of the material. Outdoor power equipment will destroy the seal due to thermal expansion and cold contraction, and moisture will invade the insulation; Or because the thermal expansion coefficient of porcelain insulators and metal parts is different, when the temperature changes drastically, the porcelain insulators are broken.

Chemical Aging Under the action of moisture, acid, ozone, nitrogen oxides, etc., the material structure and chemical properties of insulating materials will change, resulting in the reduction of electrical and mechanical properties. For example, transformer oil (see) will produce organic acids due to oxidation in the air, which will increase TG[kg2] (see); At the same time, it will also form solid sediment, block the oil channel, affect the convection heat dissipation, and make the temperature of the insulation rise and the insulation performance decrease.

Mechanical force aging Under the action of mechanical load, dead weight, vibration, impact and short-circuit current electrodynamic force, the insulation will be destroyed and the mechanical strength will decrease. For example, the insulation at the notch is easy to crack and delaminate due to long-term vibration and high temperature, and eventually damage.

Humidity Aging The relative humidity of the environment has an impact on the ability of the insulating material to withstand surface discharge. If moisture penetrates the insulation, it will increase the dielectric loss or drop the breakdown voltage.

It is caused by excessive voltage or aging insulation.

The insulation properties of the insulator are destroyed, and a conductive channel is formed. It is the breakdown of insulators.

The causes of insulator breakdown are:

mechanical damage; Aging; overvoltage; overtemperature; Damp; dust pollution and so on.

If the insulator is not insulated, the carbonization and conduction are called insulator breakdown.

The actual voltage far exceeds the working voltage of the insulator, destroys the insulation performance of the insulator, forms a conductive channel, and instantaneously has a strong current through. It is the breakdown of insulators.

The phenomenon that the insulator completely loses its insulating properties under the action of strong electric field and other factors is called the breakdown of insulation, and it is said that it is correct.

The phenomenon that the insulator completely loses its insulation performance under the action of strong electric field and other factors is called the breakdown of insulation, and the breakdown is divided into gas dielectric breakdown, liquid dielectric breakdown and solid dielectric breakdown, the voltage when the dielectric breakdown occurs is called the breakdown voltage, and the electric field strength when the dielectric breaks down is called the breakdown voltage.

Summary. The highest voltage applied at the moment when the insulating material is broken down is called the breakdown voltage of the material; The ability of an insulating material to resist electrical breakdown is called breakdown strength.

What is the breakdown voltage and breakdown strength of insulating materials?

The highest voltage applied at the moment when the insulating material is broken down is called the breakdown voltage of the material; The ability of an insulating material to resist electrical breakdown is called breakdown strength.

When the voltage applied to the material increases to a certain critical value, the internal structure of the material is destroyed and loses its insulating ability, which is called breakdown, and this voltage is called the breakdown voltage, and the electric field strength when the material is broken down is called electrical strength.