What are the advantages of composite insulators?

Silicone composite insulator Tianheng series products, effectively improve the reliability of safe operation, can save a lot of manpower, material and financial resources, due to its high bending strength, large span and compact line, is 8 10 times of high-strength porcelain materials, low temperature resistance, high strength, is irreplaceable by porcelain cross arms; Small size, light weight, shockproof, no need to clean, reduce the daily maintenance workload.

It has strong impact resistance and shockproof performance, its good brittle resistance and creep resistance, and glass insulator interchangeability.

Good sealing performance, strong impact resistance, no need for manual cleaning. 5 times. And it does not need to be cleaned, and it can operate safely in heavy pollution.

Small size, easy to maintain; Lightweight and easy to install; High mechanical strength, not easy to break; Excellent seismic performance and good stain resistance; The production cycle is fast and the quality stability is high.

Advantages of composite insulators: small size, easy to maintain; Lightweight and easy to install; High mechanical strength, not easy to break; Excellent seismic performance and good stain resistance; The production cycle is fast and the quality stability is high.

Composite insulator use: in the early years, insulators were mostly used in power poles, with the development of science and technology, slowly developed in the high-type high-voltage wire connection tower at one end of the hanging a lot of disc-shaped insulators, it is to increase the creepage distance, usually made of glass or ceramic, it is called insulators. Insulators play two basic roles in overhead transmission lines, namely supporting wires and preventing current from returning to the ground, these two roles must be guaranteed, and insulators should not fail due to various electromechanical stresses caused by changes in environmental and electrical load conditions, otherwise the insulators will not have a major effect, and will damage the use and operation life of the entire line.

Abstract: Before using an insulator, we should have a basic understanding of it, such as what is the meaning of the letter of the insulator model and what are the characteristics of the insulator. The characteristics of insulators should be elaborated separately according to different types, such as the characteristics of porcelain bottle insulators are that there is a high deterioration rate, zero value needs to be detected, and the maintenance workload of slag is large.

For specific information about insulators, come with me to the article to take a look! 1. What is the meaning of the letter of the insulator model?

The meaning of the commonly used insulator model code is as follows:

1. P-needle type, used for the first letter of the model.

2. XP-suspension, the old type uses X to represent suspension.

3. T-iron cross-shoulder.

4. M-wood cross-shoulder.

5. CD-porcelain cross-arm.

6. The connection mode of C-suspension insulator is trough, and the spherical connection is not marked.

For example, P-10T and P-10M are 10kV pin insulators for iron crossarms and pin insulators for wood crossarms, respectively.

The XP-7C and XP-4 replace the older models and the X-3 suspension insulators, respectively.

2. What are the characteristics of insulators?

Insulator: It is an object that insulates and hangs wires on a tower. The commonly used insulators for power transmission lines are:

Disc porcelain insulators, disc glass insulators, rod suspension composite insulators. The characteristics of insulators should be introduced according to the type, and the characteristics of different insulators are different:

1. Porcelain bottle insulator: domestic porcelain insulator has a high deterioration rate, needs to detect zero value, and has a large maintenance workload. In the event of lightning strikes and pollution flashes, it is easy to fall off the string of accidents, and has been gradually eliminated.

2. Glass insulator: it has zero value self-explosion, but the self-explosion rate is very low (generally a few ten-thousandths). Maintenance does not need to be tested, and the residual mechanical strength of tempered glass parts in case of self-explosion is still more than 80 of the destructive tensile force, which can still ensure the safe operation of the line.

In the event of lightning strikes and dirt flashes, there will be no accidents. It has been widely used in the grade pollution area.

3. Composite insulator: It has the advantages of good anti-fouling flashover performance, light weight, high mechanical strength, and less maintenance, and has been widely used in dirty areas at and above level.

4. Porcelain insulator: Insulator is commonly known as porcelain bottle, which is an insulator used to support wires.

I believe you are no stranger to the ceramic insulator This kind of power equipment should be no stranger, under normal circumstances, we can always see it on some electric poles, or on high-voltage lines. So what are the advantages and disadvantages of ceramic insulators? What are the models?

What are the manufacturers?

Porcelain insulators have good chemical and thermal stability, almost do not deteriorate through aging, and have good electrical and mechanical properties. There are new varieties such as ** diameter, L00 400KN large tonnage, ordinary type and bell type umbrella. But in general, the number of porcelain insulator manufacturers has basically not increased in recent years, but has decreased through integration and reorganization in the same fierce market competition.

Tempered glass insulator has the characteristics of zero value self-breaking, easy to detect, in the actual use can fully show good performance advantages, good function and role, tempered glass insulator has the characteristics of zero value self-breaking. As long as it is observed on the ground or on the ground, there is no need to climb the pole to detect piece by piece, which reduces the labor intensity of the workers.

Product structure and stain resistance are key. The glass insulator adopts a cylindrical head structure, and the load-bearing components are evenly stressed. Compared with the traditional porcelain insulators in China.

The conical head structure has been made for decades, and has the characteristics of small size, light weight, high strength and excellent electrical properties.

Because the linear expansion coefficient of glass is much larger than that of porcelain, the size of the exterior is much smaller than that of composite insulating materials, and it is easy to connect with metal accessories and cement, so the material of the stressed components is well matched. In all climates, it will not be like porcelain insulators.

It is as easy as composite insulators to produce dangerous stresses that lead to aging. Moreover, it is difficult for composite insulators to solve the structural quality of composite interfaces.

Ceramic insulator model.

Ceramic insulator models: X-3, X-3C, X-4,,, pin porcelain bottles PD-1, PD-2, PD-3, P-6, P-10, P-15, PS-20, PS-15, PQ-20, P-20C.

Ceramic insulator is the earliest insulator du that appeared in bai, and the process is simple, but.

zhi is and there is no dao

The advantage that you mentioned is that it is not easy to accumulate pollution, but in fact, the pollution of ceramic insulators on site is also very serious. The biggest advantage of glass insulators over ceramic insulators is that they do not need to carry out zero-value detection, and zero-value glass insulators will self-detonate. Composite insulator is a later developed insulator, which has the advantages of light weight, high strength, non-breakdown, and the most important advantage is strong anti-pollution and flashover ability.

But after all, it is a composite material, and compared with glass and porcelain, the phenomenon of aging is more prominent.

1. Glass insulator.

Advantages: The surface of the glass insulator has high mechanical strength, the surface is not prone to cracks, and the aging speed is slow; The live periodic preventive test of the insulator during operation can be cancelled, and there is no need to carry out "zero value" detection in operation, and the operation and maintenance cost is low.

Disadvantages: Due to the transparency of the glass, it is easy to find small cracks and various internal defects and damage during appearance inspection.

2. Ceramic insulators.

Advantages: It has good chemical and thermal stability, strong anti-aging ability, and has good electrical and mechanical properties, flexible assembly.

Disadvantages: Defects are not easy to detect and only start to be discovered after a few years of operation; Zero-value detection of ceramic insulators must be carried out on the tower for piece-by-piece detection, which requires a lot of manpower and material resources; There is a high chance of accidents caused by lightning strikes and filth flashovers.

3. Composite insulators.

Advantages: small size, easy to maintain; Lightweight and easy to install; High mechanical strength, not easy to break; Excellent seismic performance and good stain resistance; The production cycle is fast and the quality stability is high.

Disadvantages: The anti-aging ability is not as good as that of ceramic and glass insulators, and the production cost is higher than that of ceramic and glass insulators.

The requirements for the performance of the insulator first of all, the insulator in the operation of the insulator not only to bear the effect of working voltage, but also to the effect of overvoltage, not only to withstand the action of mechanical force, but also by the temperature change and the surrounding environmental conditions, so the general performance of the insulator must meet the following points:

1. It should have good insulation performance, so that it can withstand the pressure specified in the standard in dry and rainy conditions;

2. Must have sufficient mechanical strength;

3. The insulator can withstand large temperature changes without breaking;

4. The aging speed of the insulator is required to be relatively slow and have a long service life.

5. It is required to have sufficient anti-pollution and anti-chemical gas erosion ability.

Ceramic insulators: They have the advantages of good insulation properties, climate change resistance, heat resistance and flexible assembly, and are widely used in lines of various voltage levels. Disc porcelain insulator is a breakdown type, it is composed of cement to glue the porcelain and metal parts with different physical and chemical properties, and will gradually deteriorate under the action of electric field, mechanical load and natural sunlight, wind, rain, snow, fog, etc., which will gradually deteriorate and pose a threat to the safe operation of the power grid.

In particular, if a flashover occurs in an insulator string containing a deteriorated insulator (due to lightning strikes or dirt flashovers, etc.), the head of the deteriorated insulator may instantly heat up**, causing an accident in which the wire falls to the ground.

Glass insulator: It has good mechanical and electrical properties, and its tensile strength, electrical breakdown resistance, vibration fatigue resistance, arc burn resistance and cold and thermal shock resistance are better than porcelain insulators. And unlike porcelain insulators, glass insulators have a zero-value self-detonation insulation self-elimination ability, so they can be easily detected without the need for insulation testing.

The self-detonation rate is usually higher in the first 3 years, which is the opposite of porcelain insulators. Decades of operating and test data have proven that tempered glass insulators have long-term stable electromechanical properties and a long service life. In order to achieve a large creepage distance, the anti-fouling glass insulator can only be achieved by adding several deep edges on the lower surface of the umbrella skirt (due to process reasons, it is not possible to increase the creepage distance through double or triple umbrellas like porcelain insulators).

When used in areas with serious dust pollution, due to the poor self-cleaning ability and inconvenient cleaning of the umbrella type with deep edges of the bell, the scale of the lower surface is serious, resulting in a great reduction in the ability to resist pollution and flashover.

Synthetic insulators: It has many advantages such as small weight, high strength, good stain resistance, and low maintenance workload. The surface of the silicone rubber synthetic insulator is hydrophobic, and the contamination layer attached to the surface of the umbrella skirt is also hydrophobic (i.e., the hydrophobic migration of silicone rubber), which greatly improves the stain resistance of the synthetic insulator.

From the perspective of domestic use, in the previous large-area pollution flashover accidents, synthetic insulators have shown excellent anti-pollution flashover ability, and in the case of low external insulation level and heavy pollution, synthetic insulators are a better choice object.

Finally, I would like to add that the quality of synthetic insulators is indeed very light, but it is not unsuitable for jumper insulators, the key is to see how your jumper is designed, what if it is a V-string???

I choose it according to the anti-fouling level.

Composite insulators are lightweight and unsuitable for use in jumpers.

It has the following advantages:

1) Superior mechanical properties: because the mandrel is made of epoxy glass fiber, its expansion strength is twice that of ordinary steel, 3 4 times that of high-strength porcelain, the axial tensile force is particularly strong, and it has strong vibration absorption ability, and the seismic damping performance is very high, which is 1 7 1 10 of porcelain insulators.

2) The composite insulator string has good anti-pollution and flashover performance: the composite insulator has hydrophobicity, and when it rains, the umbrella corrugated surface of the composite insulator will not be wet to form a water film, but will drip in the form of water beads, which is not easy to form a conductive channel, and its pollution lightning voltage is higher, which is 3 times that of the porcelain insulator of the same voltage level.

3) Excellent electrical corrosion resistance: the leakage flashover on the surface of the insulator forms an irreversible deterioration and marking phenomenon, and the general standard is not lower than grade (i.e., the composite insulator is grade 6 7.

4) Good anti-aging performance: After ten years of practical testing, it is shown that the composite insulator has no change in surface wetting and erosion resistance except for a slight darkening of the color and a slight increase in the dielectric constant and dielectric loss angle, indicating that the anti-aging performance is good.

5) Good structural stability: the general porcelain suspension insulator is an inner rubber assembly structure, due to galvanic corrosion, low zero value insulation resistance will be produced during operation, while the composite insulator is an outer rubber assembly structure, and its inner is a solid rod insulation material, there is no deterioration and breakdown, and there will be no zero value insulator.

6) High line operation efficiency: due to the good self-cleaning of the composite insulator in wind and rain, and does not produce zero-value insulators, the cleaning and inspection work can be changed to once every 4 5 years, so as to shorten the maintenance and power outage time.

7) Light weight: The insulator itself is lightweight, which can greatly reduce the labor intensity of the staff in transportation and construction operations.

But things are split in two, and composite insulators also have some drawbacks:

1) Composite insulator** high.

2) The radial (perpendicular to the centerline) stress of the composite insulator is very small, therefore, the high-voltage insulator used for the tension rod is strictly forbidden to step on, or any form of radial load, otherwise it will cause breakage.

3) It is strictly forbidden to fall or rub hard objects during construction or normal operation, because the umbrella part is silicone rubber, the texture is relatively soft, and it is easy to damage and destroy the sealing, resulting in a decrease in insulation performance.