Schneider long-term partner, the only supplier in Central China

Schneider certified company

60 years experience in insulation material production

Chinese electrical manufacturer

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Rich Experience

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

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Cooperation with many universities in China, technology innovation

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Timely resolution of customer problems, commitment to quality in the end

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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

Phenolic laminated paper tube

1.Funcation: Good dielectric property under dry state. Good mechanical strength.

2.Standard: JB 3712-82

3.Usage: Used as insulating structural parts of electrical apparatus in transformer oil.

Item units values                
3520 3640 3641 380 382 364 355 356 3652    
Density g/cm
3
Less thanΦ25mm, ≥1.03.
More thanΦ25mm, ≥1.1
Less thanΦ13mm, ≥1.65.
More thanΦ13mm, ≥1.7
Less thanΦ13mm, ≥1.65.
More thanΦ13mm, ≥1.7
≥1.25 —- ≥1.40 ≥1.5 ≥1.5 ≥1.5
Bending strenth MPa ≥50-60 ≥17 —- ≥137 ≥400 ≥117.6 —- ≥150 >80
Compressive strength MPa ≥50-60 ≥68 ≥138 ≥118 ≥98 ≥68.6 ≥80 ≥70 ≥70
Shear strength MPa —- —- ≥14.7 —- —- ≥9.8 ≥8.0 ≥12 ≥10
Water absorption rate % 3-10 —- 0.4-1.0 ≤1.2 —- —- —- —- —-
Vertical layer direction voltage resistance(in 90℃±2℃ transformer oil 5min) KV 8.5~6 7~18 —- —- —- 7~18 —- —- —-
Parallel layer direction voltage resistance (in 90℃±2℃ transformer oil 5min) KV 20~25 25 —- —- ≥25
Normal state
—- 30 —- 25
Surface voltage resistance KV 12 12 —- —- —- —- —- —- —-
Dielectric loss factor (50Hz,180℃±2℃)   ≤0.03 ≤0.03             ≤0.03
Volume resistivity 180℃ MΩ.m —- —- —- —- —- ≥10
5
—- ≥10
5
—-
Thermal stability 120(24h) —- —- 105(24h) —- —- —- —- —-
0
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Phenolic cotton cloth tube

1. Funcation: High mechanical strength properties, wear resistance, low water absorption rate.

2. Standard: JB 4037-85

3. Usage: Used as the radial thrust bearing and material with wear resistance.

Item units values                
3520 3640 3641 380 382 364 355 356 3652    
Density g/cm
3
Less thanΦ25mm, ≥1.03.
More thanΦ25mm, ≥1.1
Less thanΦ13mm, ≥1.65.
More thanΦ13mm, ≥1.7
Less thanΦ13mm, ≥1.65.
More thanΦ13mm, ≥1.7
≥1.25 —- ≥1.40 ≥1.5 ≥1.5 ≥1.5
Bending strenth MPa ≥50-60 ≥17 —- ≥137 ≥400 ≥117.6 —- ≥150 >80
Compressive strength MPa ≥50-60 ≥68 ≥138 ≥118 ≥98 ≥68.6 ≥80 ≥70 ≥70
Shear strength MPa —- —- ≥14.7 —- —- ≥9.8 ≥8.0 ≥12 ≥10
Water absorption rate % 3-10 —- 0.4-1.0 ≤1.2 —- —- —- —- —-
Vertical layer direction voltage resistance(in 90℃±2℃ transformer oil 5min) KV 8.5~6 7~18 —- —- —- 7~18 —- —- —-
Parallel layer direction voltage resistance (in 90℃±2℃ transformer oil 5min) KV 20~25 25 —- —- ≥25
Normal state
—- 30 —- 25
Surface voltage resistance KV 12 12 —- —- —- —- —- —- —-
Dielectric loss factor (50Hz,180℃±2℃)   ≤0.03 ≤0.03             ≤0.03
Volume resistivity 180℃ MΩ.m —- —- —- —- —- ≥10
5
—- ≥10
5
—-
Thermal stability 120(24h) —- —- 105(24h) —- —- —- —- —-
0
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Warren cloth laminated tube Epoxy fiberglass cloth winding tube

It is specially applied in line suspension tube composite lightning arrester.

No. Index name Unit Index data Test data
1 Density G/cm3 ≥1.80 1.93
2 Water absorbing % ≤0.4 0.15
3 Bending strength Mpa ≥172 195
4 Dielectric constant ≤5.5 2.3
5 Vertical layer electrical strength(in 90℃ Oil) MV/m ≥10 18
6 Pararllel layer break down voltage(in 90℃ ±2 oil) KV ≥28 39
7 Combustibility(FV) FVO FVO
8 Heat resistance class H ≥180℃ 180℃
0
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