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ZTELEC is engaged in the production of insulating materials for 60 years

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Product Category

Enamelled Wire

The enameled wire is a main type of winding wire. It consists of two parts: the conductor and the insulating layer. The bare wire is annealed and softened, and then baked and baked.

Electrical Materials

Diamond dotted paper, Epoxy fiberglass board, Insulated crepe paper,NHN, DMD, Electrician cotton belt,Copper clad laminated

Power Transformers

Epoxy resin pouring dry type transformer, oil immersed transformer, dry phase shifting rectifier transformer,Mining transformer, box transformer

Copper Clad Laminate Sheet

FR-4 double-sided copper-clad PCB sheet parameter classification

FR-4 sheet is a double-sided copper-clad PCB sheet made of epoxy resin + glass cloth + copper foil. If you highlight the performance of CCL products, there are three important indicators: dielectric constant, dielectric loss, TG value.
The commonly used FR4 copper clad laminate has a dielectric constant of 4.2-4.7 relative to air. This dielectric constant varies with temperature and can vary up to 20% over a temperature range of 0-70 degrees. A change in the dielectric constant results in a 10% change in line delay. The higher the temperature, the greater the delay. The dielectric constant also varies with the signal frequency. The higher the frequency, the smaller the dielectric constant. The typical dielectric constant of the design is 4.4. read more

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Epoxy Resin Laminated Fiber Glass Pultruded

Epoxy Resin Laminated Fiber Glass Pultruded Rod

 I. Define and purpose
Glass fiber is mainly made of SiO2, MgO2, Na2O, CaO, etc. According to the amount of alkali, it can be classified into three kinds: non-alkali glass fiber, mid-alkali glass fiber and high-alkali glass fiber. It is mainly used as insulation material, wet-proof material and noise reduction material.
II. Technical requirement for surface
The surface of laminated rod should be flat and smooth, no bubble, no wrinkle, no delamination or crackle, and properly free from other defects such as scrape, impress, dirty spot and uneven color, but a little color patches is allowed.
Ⅲ. Characteristics
The Glass Fiber Rod is commonly used. It is very stiff and strong with low water absorption and flame retardant. What’s more, it has other advantages, such as extremely durable, good dimensional stability, good heat resistance, good mechanical properties and so on.
VI. Application
Solid glass fiber rods have thousands of industrial, commercial and recreational uses. Because they are not electrically conductive, they are a great material for antennas. Glass fiber rods are frequently used as a strengthening core in applications where conductivity is an issue, as standoffs and for kite framework. In addition, glass fiber rods are used as flexible framing for outdoor structures such as tents and small greenhouses. They are inexpensive, offer a high strength-to-weight ratio, flexible and extremely durable. read more

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Insulation Dog Bone

Insulation Dog Bone For Transformer

Epoxy/Polyester Resin Pultruded Profile
This product is made of non-alkali glass fiber yarn impregnated with unsaturated polyester resin by the traction force and finally pultruded and solidified in hot mold. It is mainly used as insulation components of electrical equipment. The product can be rectangular, I-shaped, angular, T-shaped, groove-shaped, tubular and cylindrical, etc. read more

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Htg Fiberglass Sleeve

Htg Fiberglass Sleeve

After using the alkali-free glass fiber woven tube, the special resin is bonded by high temperature dewaxing and fixing. The heat resistance can reach 400-600℃. It has the characteristics of tensile resistance and high temperature resistance. read more

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Acrylic Glass Fiber Sleeve

Acrylic Glass Fiber Sleeve

It is a kind of insulating sleeve made of alkali-free glass fiber woven tube coated with acrylate and then heated and dried.

It has good dielectric properties, flexibility and elasticity, and can be used for wiring insulation and mechanical protection of motors, electrical appliances, meters, radios and other devices. read more

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PVC Glassfiber Sleeve

PVC Glassfiber Sleeve

It is a kind of insulating sleeve made of alkali-free glass fiber woven tube coated with pvc resin and then heated and plasticized.

It has excellent softness and elasticity, good dielectric and chemical resistance, good mechanical strength, suitable for electric motor, circuit, instrument, instrument and household electrical equipment wiring and mechanical protection. read more

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How to improve the short-circuit resistance of power transformers

The power transformer is the hub for transmitting and distributing electrical energy, and is the core component of the power grid. Its reliable operation is not only related to the power quality of the majority of users, but also related to the security level of the entire system. The reliability of a power transformer is determined by its health, not only by design and manufacturing, structural materials, but also closely related to maintenance. How to improve the short-circuit resistance of power transformers has become a problem for many people. read more

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Oil-immersed distribution transformer

If calculating the current on the high and low side of the distribution transformer

The distribution transformer is used as an electrical device and its current value is also an important parameter. So today ZTELEC teaches you how to calculate the high voltage and low voltage side current of the transformer.
1. Fast estimation method
Oil-immersed distribution transformer capacity / 100, take an integral multiple, then * 5.5 = high-side current value, if it is * 144, is the low-side current value
For example, a transformer with a capacity of 1000KVA, /100 takes an integral multiple of 10, then the high-side current value is 10*5.5=55A, and the low-voltage side current value is 10*144=1440A.
2, linear coefficient method
Remember the high and low voltage side current values ​​of a dry distribution transformer with a common capacity. Other capacity can be linearly derived.
For example, a transformer with a capacity of 1000KVA, the calculated value of the high-side current is 57.73A, and the calculated value of the low-side current is 1443.42A;
Then remember this data, other capacity can be derived from this
For example, a 1600KVA distribution transformer, the high-side current is (1600/1000) * 57.73 = 92.368A, the low-voltage side current is (1600 / 1000) * 14443.42 = 2309.427A.
3. Rough estimation method
High side current = transformer capacity / 20, low side current = transformer capacity * 2
For example, 1000KVA transformer, high-voltage side current = 1000/20 = 50A, low-voltage side current = 1000 * 2 = 2000A, this method is too rough, generally used by the design institute for switching element type selection, cable selection and calibration Common methods used in the test
4, formula calculation method
Formula: I=S/1.732/U
I–current, unit A; S–transformer capacity, unit kVA; U–voltage, unit kV read more

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