Nomex ^® T410

NOMEX® is a synthetic aromatic polyamine polymer. When it is made into various types of plates, it will give products high -grade electrical, chemical and mechanical properties. The correct use of NOMEX® products can extend the service life of the electrical equipment, reduce the number of premature damage and maintenance, and can play a safe protection role in the situation where the electric field is unpredictable.

When you use NOMEX® insulation products, you have continuous reliable thermal performance protection in 40 years, which can meet your different industrial standards and ensure the long -term service life and reliability of the product.

The frequency change below 10Hz has basically no effect on the dielectric constant of NOMEX 410 paper. The shadow loud curve of the medium loss factor of the temperature and frequency of the dry NOMEX 410 paper -0.25mm (10mil) paper is shown in Figure 2.

When the temperature is lower than 200 ° C, the 60Hz medium loss factor of the 60Hz medium of 0.25mm (10mil) paper is basically the same. At a higher humidity and frequency, the medium loss factor of thicker paper is slightly higher than the 0.25mm (10mil) paper.

Figure 3 shows the relationship between the surface and volume resistivity and humidity of the dry NOMEX 410 paper -0.25mm (10mil) paper. The corresponding values of NOMEX ° 410 paper of its thickness are very similar.

It can be seen from the table that the effect of moisture (humidity) on NOMEX 410 paper -0.25mm (10mil) paper is relatively small.

Figure 2: NOMEX 410 paper -0.5mm (10mil) The relationship between the medium loss factor and temperature and frequency of insulation paper	Figure 3: NOMEX 410 paper -0.5mm (10mil) paper resistance and temperature relationship

Like other organic rope materials, NOMEX paper will gradually erode by electricity discharge. Electric halo intensity is a function of the power field strength, and the strength of the electric field depends almost entirely on design parameters such as interval, smoothness and sharp shapes such as circuit components. Although appropriately designed equipment does not generate electricity during the normal operation, any device may withstand sudden overvoltage, generating instantaneous electric halo and discharge: and the rope edge material will not be invalid in these circumstances. It can be seen from Figure 4 that the tolerance voltage strength of the NOMEX 410 paper (the failure time under the impact of the electro -halo) is better than other commonly used organic insulation materials, and it can even be comparable to certain inorganic synthetic substances. These data are obtained on a single layer 0.25mm (10mil) material under the condition of room temperature, 50%relative humidity and 360Hz frequency. The failure time of the material under 50-60Hz is about 6-7 times the icon. The aging curve of NOMEX 410 paper is shown in Figure 5. These values were determined after long-term electrical aging testing according to ASTMD-2275. If necessary, it can provide suggestions on special design.

Figure 4: Various insulation materials and single-layer NOMEX410 paper -0.25mm (10mil) paper resistance strength	Figure 5: Single-layer NOMEX 410 Paper-0.25mm (10mil) The resistance of voltage resistance at 60Hz

The typical mechanical performance value of NOMEX 410 paper is shown in Table III. Figure 6 reflects the effects of high temperature confrontation strength and extension rate. NOMEX flake material still maintains good mechanical performance at extremely low temperature. Under the liquid nitrogen boiling point (negative 196 ° C or 77K), the tensile strength of Nomex 410 paper -0.25mm (10mil) paper exceeds 30 to 60%of its room temperature (related to the direction), and the breakdown rate is still greater than 3% (Occasionally than most of the inorganic materials at room temperature). This allows NOMEX 410 paper to work normally in low temperature environments. Water is a soft plasticizer of NOMEX 410 paper. The effects of tide (humidity) confrontation strength and extension rate are shown in Figure 7. Like the extension rate, the tear resistance and toughness of NOMEX410 paper will also increase when the humidity is high. Compared with a completely dry state, the size of NOMEX 410 paper is exposed in an environment with a relative humidity of 95%. Dry the paper again, and its size can basically be restored.

Of course, the change rate of size is related to the thickness and shape of the paper (for example, the comparison of a single piece material is different from the tightly wrapped paper rolls). The changes in environmental humidity usually only cause a size change of less than 1%. However, even if it is small size changes, especially when these changes are uneven, it will cause or aggravate the unevenness (depression, wrinkles, etc.), which may cause question. Therefore, the NOMEX 410 paper used for this occasion should be sealed in its polyethylene protection packaging before use to maintain a uniform moisture content.

Figure 6: The impact of temperature on the mechanical performance of NOMEX ° 410 paper -0.25mm (10mil) paper	Figure 7: The impact of the mechanical performance of the tide on NOMEX 410 paper -0.5mm (10mil) paper

The effects of long-term exposure to the important electrical and mechanical properties of NOMEX 410 paper -0.25mm (10mil) are shown in Figure 8, 9, and 10. These Arenius aging performance curves are the basis of NOMEX 410 paper by insured experiments (UL), the US Navy, and its institutions that have been confirmed by 220 ° C insulation materials, and have been confirmed in business practice for more than 40 years. These curves can also be extended to higher temperatures. For example, the measurement results show that at 400 ° C, the NOMEX 410 paper can maintain a dielectric strength of 12kv/mm (300V/mil) for a few hours. This is the same as the performance speculated by the 0K curve.

Figure 8: NOMEX 410 Paper-0.25mm (10mil) Paper's effective life and temperature relationship	Figure 9: NOMEX 410 paper -0.2 5mm (10mil) Paper's effective life and temperature relationship

The thermal conductivity of NOMEX 410 paper-0.25mm (10mil) paper is shown in Figure 11. These values are similar to the thermal conductivity of fibrous paper, and the same amount of materials, mainly determined by the proportion (density). Therefore, it can be seen from the Table IV that the less dense NOMEX 410 paper thermal conductivity is slightly lower, while the dense and thicker NOMEX 410 paper has higher thermal conductivity. The composition of the entire system may affect the total heating rate. Therefore, the data in each table should be paid attention to when applying the data in each table to actual occasions. For example, the two -layer rope edge material with different thermal conductivity is completely different from the heat transfer effect of the same coil. Due to the different rigidity or coil tension, it will affect the distance between the rope edge layer.

Figure 10: NOMEX 410 paper-0.25mm (10mil) Paper's effective life and temperature relationship	Figure 11: NOMEX 410 paper-0.25mm (10mil) paper The relationship between thermal conductivity and temperature

NOMEX paper and laminar pressure plates are almost all components of electrical enviouss and adhesives (polyiline, polysiloxane, epoxy, polyester, acrylic, phenol, synthetic rubber, etc.) and other components on electrical equipment Compatible, many insulation systems containing NOMEX products have been recognized in UL and have long -term business practice. NOMEX paper is also completely compatible with transformer oil (mineral oil, silicone oil, and other synthetic substances) and the lubricant and frozen agent used in the sealing system. Commonly used industrial solvents (alcohol, metharone, acetone, toluene, diene) will have slight softening and expansion on NOMEX 410 paper, but after removing the solvents, most of these effects can be cleared.

At room temperature, the oxygen limit index (LOI) of NOMEX 410 paper is between 27%and 32%(depending on the thickness and density of the paper). At 220 ° C, the index changes to 22%to 25%. The material of LOI is greater than 20.8%, and it will not burn in the air. Only when heating to 240 ° C to 350 ° C (still depends on thickness), the LOI value of NOMEX 410 paper can be reduced to the combustible point. The size of NOMEX410 paper-0.13mm (5mil) paper (LOI) is shown in Figure 12.

Table V shows the effects of β -ray radiation of 2MEV of 6400 MPARD (64mgy) on the mechanical and electrical performance of Nomex 410 paper. (As a comparison, the composite plate of the same thickness of the same thickness of the 100%epoxy and the composite plate of the composite plate of the polyal plate was broken through 800 MPARD or 8mgy. Essence NOMEX's excellent anti -radiation can make them applied to key control devices of nuclear energy devices.

Figure 12: NOMEX ° 410 Paper-0.3mm (5mil) The oxygen limit index (LOI)	The effect of temperature on the electrical performance of NOMEX 410 0.25mm (10mil) insulation paper