The development and development of insulation transformer pressboard is one of the key factors affecting the development of electrical technology. From the future trend, the requirements of the development of high pressure, heat insulation, impact resistance, environmental insulation, composite insulation, corrosion resistance, water resistance, oil resistance, resistance to cryogenic, radiation and flame retardant materials, research and development of environmentally friendly energy- Motor F, H-class insulation series, such as unsaturated polyester resin glass felt board; high-voltage power transmission equipment with sulfur hexafluoride gaseous medium; instead of chlorinated biphenyl new non-toxic synthetic media; high-performance bakelite electrical insulation board; synthetic paper composite insulation; flame retardant rubber and plastic materials and surface protection materials, while actively promoting the traditional electrical equipment insulation materials replacement.

phenolic laminated sheet has a certain characteristics, in the end with what characteristics?
First, chemical resistance
Second, glossy, partially transparent or translucent
Third, most of the good insulator
Fourth, light weight and strong
Fifth, the processing is easy to mass production, cheap
Sixth, the use of a wide range of useful, easy to color, some high temperature
Seventh, storage of goods can play a moisture-proof effect of plastic is also divided into general-purpose plastics and engineering plastics, mainly the use of the broad to define, such as PE, PP cheap, can be used in a variety of different types of machine production

Insulation resistance of insulating materials

phenolic rod can prevent current from passing through the material. Its resistivity is very high, usually in the range of 10 ~ 10Ω · m. What is the flame resistance of insulating materials? Here we come together to understand the next:
The flame resistance of NMN Insulating material refers to the ability of the insulating material to resist the continued combustion when it is combusted or burned away from the flame. With the increasing use of polyimide adhesive tape, its flammability requirements are more important, people through various means to improve and improve the flame resistance of insulating materials. The higher the flame resistance, the better the safety.

What does high-voltage insulation contain?

High-voltage mica insulation sheets is a kind of insulating material, insulation material is a kind of insulator, it also includes solid and liquid. That is to say, high-voltage insulation material must be insulating material, but the insulation material and must be insulated high voltage, such as ordinary wire foreskin, but the high voltage can only be instantaneous breakdown.
High voltage insulation material is vulcanized fiber sheet. According to the national standard GB2900.5 provides the definition of insulating material is: "used to make the device in the epoxy glass laminate sheet." That is, to prevent the current through the material. Its resistivity is very high, usually in the range of 10 ^ 9 ~ 10 ^ 22Ω · m. As in the motor, the insulating material around the conductor isolates the turns and isolates it from the grounded stator core to ensure safe operation of the motor.

The nature and use of various types of epoxy board products in insulating materials

Epoxy boards contain flame retardant materials, so it is also an mica tape for cable, a lot of this type of material, can be distinguished according to different basis, but the same is their performance, high temperature, corrosion resistance, high Toughness, high strength, high mechanical processing and so on.
Epoxy board can be divided into water green, water blue, black, yellow, white; or by chemical composition can be divided into halogen epoxy plate and halogen-free epoxy board; can also be divided into flame retardant epoxy Board and non-flame retardant epoxy board two categories.
To G11 epoxy board, it is a hard mica cable tape, its heat resistance and water resistance are very good, glass transition temperature of 175 degrees Celsius, can be used in humid environments. Therefore, such a plate is mainly used to manufacture high-voltage switch.
There is also a water green G10 epoxy board, which is made by dipping the alkali-free glass fiber cloth with epoxy resin. Since the alkali-free glass fiber cloth is a material containing no halogen element, it does not cause environmental Pollution, switchgear, transformers, explosion-proof electrical appliances are made of this insulating material.
Compared to the price of 3240 epoxy board cheaper, such acetate cloth tapes are generally used in low-grade, mid-range electrical products. In addition, there is a special electronic parts and epoxy phenolic resin and other materials made of hot FR-4 epoxy board, mainly used to manufacture insulation pads, transformer insulation board, grinding gears and so on.

How to measure the mechanical strength and insulation properties of insulating materials?

Any mechanical equipment in the choice of insulating materials, the concern is nothing more than the material of the fiber material, density, permeability, uniformity and a series of mechanical strength. What is the mechanical strength of the insulating material? What are the requirements?
The mechanical strength of the EPGC202 mainly refers to the tensile strength, the stamping strength, the tear strength and the toughness, among which the insulating material is required to withstand the tensile load without being pulled The maximum stress of the break.
And the stamping strength of the insulating material refers to a measure of the ability to withstand the pressure without being broken; the tear strength is the force required to tear the insulating material to the appropriate standard; and the toughness, in the case where the polyimide glass fiber is folded or bent When the strength to meet the corresponding requirements.
 In addition, it is necessary to judge the solid insulation properties of the insulating material. The usual way is to measure the degree of polymerization of the material or to measure the content of furfural in the oil by means of high performance liquid chromatography (HPLC), so that when the equipment fails , Whether it will adversely affect the paper banding tape.
In the maintenance of insulating materials in the process, should pay attention to control the rated load of equipment, requiring the operation of the environment air circulation, heat dissipation conditions, to prevent the temperature rise and the cabinet lack of oil. Of course, to prevent oil pollution, deterioration caused by accelerated aging of insulating materials, thereby reducing its insulation performance.

The types and characteristics of mica products as insulating materials

Various types of mica products have excellent phenolic rod, so they are also insulating materials, and the kinds of products are also many, the production process and performance characteristics are so different, but also need to further distinguish. After mastering this knowledge, we have a deeper understanding of the insulation material.
One is a soft mica plate, it is a plate-like transformer pressboard, is bonded with adhesive tape mica or adhesive with mica adhesive in single or double-sided reinforcement material, made by baking, the general Used in motor slot insulation and turn insulation. Under normal circumstances, the soft mica board area will not be less than 400 × 600mm ², and requires a neat edge, adhesive distribution even; do not allow impurities, stratification and other undesirable phenomena.
The other is mica plate, is a different hardness of the insulation material, but in any case, they have excellent high temperature insulation properties, but also in high temperature insulation materials, has a good price; at the same time there are excellent electrical insulation Performance and bending strength and processing performance.
There is also a epoxy fiberglass tube, it is made of hard plate-like insulation material from the gasket, gasket, pad or other special-shaped pieces. When it is normal, this kind of insulating material has good mechanical strength and electrical performance, suitable for a variety of electrical appliances, welding machines, arrester, electric components such as gasket insulation.
There are also mica tubes and mica tapes, the former is a rigid tubular insulation material, mainly by the stripping mica or mica paper with the appropriate adhesive bonding in the single-sided reinforcement material from the rolling; the latter is the band of insulation material. In addition, the commutator mica board is a special insulation material, specifically for the working temperature of 130 ℃ DC motor commutator between the copper insulation design.

What are the differences and commonalities of insulating materials?

The same is paper products, but the mica insulation sheets and green shell paper is very different; and seemingly NHN insulation materials and NMN insulation materials are two different products, but in fact they have a lot in common. So sometimes can not only look or feel to judge, or to conduct in-depth analysis of the product in order to understand the relationship.
 For example, insulating paper is actually a composite insulation material, is coated with polyester film F-class adhesive, one side of the adhesive polyester fiber made of non-woven; and green shell paper is only a common by the fluorine processing Into the paper products, so they show the characteristics are different.
 Tested, the vulcanized fiber sheet has good mechanical strength, dielectric properties and high heat resistance, is Y series motor stereotypes insulation material, can be used as small and medium-sized motor slot insulation, inter-turn and interlayer insulation, Insulation and transformer insulation.
And green shell paper is showing a strong tensile strength, can be vertical and horizontal bending; and can be temperature, resistance to voltage, water, wear, grease, anti-aging, no blister, no glue, so it More suitable for electrical appliances, enameled wire, transformer insulation protection, is a good blocking gap material.
NHN Insulating Materials and epoxy glass laminate sheet appear to be two types of insulating materials, but they are all made of an intermediate layer of polyimide film and its two sides of the Nomex1 paper composed of soft composite materials; and heat resistance can be achieved H grade, and has good mechanical properties.
NHN insulation and NMN insulation are very smooth, mainly for low-voltage motor in the slot, slot cover and phase insulation; In addition, both can be used for transformers or other electrical insulation between the layers.