NHN insulating paper introduces a series of performance and application issues

NHN insulating paper is a soft composite material composed of an intermediate layer of polyimide film (H) and aramid paper (N) (DuPont paper) on both sides, with a heat-resistant grade of H (180℃), which has good heat resistance, pressure resistance and strong mechanical properties.It makes all kinds of rotating equipment (AC and DC motors, random coils and die-wire coils, as well as large turbine generators) have better thermal insulation, better mechanical properties, higher safety, and longer service life, so it is widely used.

So what are the necessary factors for NHN insulating paper?

1. Combustion resistance: Refers to the ability of NHN insulating paper to resist combustion when it comes into contact with the flame or to prevent continued combustion when it leaves the flame.With the increasingly widespread application of insulating materials, the requirements for their flame retardant properties are getting higher and higher.People use various means to improve and improve the flame resistance of insulating materials.The greater the combustion resistance, the better the safety.

2. Tensile strength: When the paper fiber is subjected to tensile load, it has a large stress that can withstand without being broken.Tensile strength and tear resistance are the large tensile stresses that the sample can withstand in the tensile test.It is a widely used and representative test method for the mechanical properties of NHN insulating paper.

3. Arc resistance: Under the specified test conditions, NHN insulating paper has the ability to withstand arc action along its surface.AC high voltage and low current are used in the test. The arc resistance of NHN insulating paper is determined by the time it takes for the surface of NHN insulating paper to form a conductive layer due to the high voltage arc effect between the two electrodes.The higher the time value, the better the arc resistance.Use it to extinguish the arc, isolate the arc, or limit the arc to a certain range.

4. Sealing degree: The sealing and isolation of oil quality and water quality is better.

NHN insulating paper has the characteristics of low density, low coefficient of friction, small elastic modulus, and good corrosion resistance. It is used instead of general structural parts with functions such as drive, support, cushioning, installation, and protection made of metal.

NHN insulating paper as an insulating material for electrical equipment such as cables and coils can greatly improve the design of transformers, reduce electrical losses, improve spare capacity, and improve safety and reliability. High-temperature insulating paper reduces the amount of steel cores and conductors, and reduces costs.Insulating paper can also improve the performance of liquid-filled transformers, NHN insulating paper, and reduce the number of inspections.In addition, the versatility and singularity of insulating paper can help reduce inventory and costs.

So how to simply judge the quality of NHN insulating paper with the naked eye?For example: no layering, no foaming, no glue, see product description, insulation resistance, leakage current and other insulation characteristic parameters.When the content of impurities and moisture in the insulating paper is high, its electrical conductivity will increase, resulting in an increase in the leakage current value.

The quality of insulating paper on the market is uneven. The main thing is to require manufacturers to provide a copy of whether the recent purchase of raw materials accounts for a large proportion of the materials, and if conditions permit, it is recommended to visit the site.

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