Company Overview

ELECTROPORCELAIN Ltd, founded in 1997 in Bulgaria, is a prominent manufacturer specializing in electrical porcelain products. Their product range includes porcelain insulators rated from 1kV to 36kV, insulating bodies for fuses, installation electroporcelain products, steatite items, and special-purpose components made by hot casting. The company employs around 50 skilled professionals and has recently upgraded its materials, equipment, and workforce training.

Materials and Standards

The primary porcelain material used is type KER 110.1 (DIN 40685) or C-110 (IEC 672), available with white or brown glaze. Dimensional tolerances adhere to DIN 40680 or BDS 7280-80 standards. Steel armatures are hot-dip galvanized per BDS 5785-83. These standards ensure product quality and compatibility with electrical systems.

Product Categories and Specifications

• Low and Medium Voltage Line Insulators (IPNN Series): Rated 1kV to 36kV, mechanical breaking load 1250–1600 dN, temperature stability through 3 cycles of 70°C, wet voltage withstand 2.5 kV.
• Rill Insulators (P and R Series): For insulation and mechanical fixing in panels up to 1000V, test voltage 6000 V for 5 seconds, thermal resistance 3 x 70°C, available in white or brown glaze.
• Carrying Insulators for Distribution Networks (Restraining Type): Designed for insulating current-carrying parts up to 1kV, with specified mechanical bending strength and discharge voltages.
• Solid-Core High Voltage Carrying Insulators (VHD Type): Rated up to 25kV, porcelain C-110 brown glaze, hot-dip galvanized steel armature, breakdown voltage up to 200 kV, bending strength up to 15 kN.
• Indoor Mounting Support Insulators (PAK and PAM Types): Voltage range 1kV to 35kV, frequency up to 100Hz, porcelain C-110 white or brown glaze, specified electrical test voltages and mechanical bending strengths.
• Solid-Core Support Insulators for Disconnecting Switches (IPPO, C4, R70 Types): Outdoor mounting up to 35kV, mechanical bending strength 3600–6000 N, electrical test voltages including impulse withstand.
• Outdoor Transformer Bushing Insulators (PRTO Type): Rated 1kV, brown glazed porcelain, various current ratings (250A to 3150A), designed for outdoor use with specified leakage paths.
• Bushing Insulators for Substations and Transformers (PRB and PRBO Types): Indoor/outdoor mounting, voltage ratings up to 20kV, current ratings up to 1000A, detailed mechanical and electrical test parameters.

Testing and Performance Parameters

Products undergo rigorous testing for mechanical strength (bending and breaking loads), electrical withstand voltages (dry and wet), impulse voltage resistance, temperature stability, and dimensional accuracy. These tests ensure reliability and safety in power transmission and distribution.

Recommendations and Usage

Insulators are intended for overhead lines, electrical panels, distribution networks, transformers, and switchgear. Selection criteria include voltage rating, mechanical load, environmental conditions, and installation type (indoor/outdoor).

Detailed Product Sections

1. Bushing Insulators (Types PRB and PRBO)

• Designed for 10kV or 20kV equipment, frequency up to 100Hz.
• Material meets BDS 3934-86 and IEC 672 standards with high acid and alkali resistance, thermal shock resistance ≥160°C, zero water absorption, density ≥2.3 g/cm³, Mohs hardness 7-8, static bending strength ≥70 MPa.
• Multiple types with 2–4 sheds, heights 295–485 mm, weights 3.5–8.5 kg.
• Electrical ratings include one-minute variable frequency and impulse test voltages; creepage distances 75–170 cm.

2. Outdoor Transformer Bushing Insulators (Type NF)

• Porcelain type C110 per IEC 672 with brown glaze.
• Dimensional tolerances per DIN 40680.
• Sizes range from 50x50x5 mm to 150x150x15 mm; weights 0.09–2.16 kg.

3. Porcelain Rashing Rings

• Used to increase contact surface in chemical processes (oil rectification, acid production, cooling, catalysis).
• Material properties similar to bushing insulators with high chemical and thermal resistance.

4. High Voltage Carrying Insulators for Transmission Lines (Types VHD, OM, VM)

• Porcelain type C110, glazed white or brown.
• Lengths 292–550 mm with specified dimensional parameters.
• Rated voltages 10kV, 20kV, 35kV; electrical parameters include dry discharge voltages, one-minute test voltages, impulse test voltages, minimum bending strength 500 dN.

5. Tubes for High Voltage Fuses up to 35kV

• Porcelain C110 with brown glaze.
• Diameters 21–36 mm, lengths 275–425 mm, weights 0.45–0.97 kg.

6. Insulating Bodies for Fuse-Links

• Materials: Porcelain C110 or Steatite, glazed white or brown.
• Dimensions and test pressures detailed; test pressure approx. 3.1 x 10^6 N/m²; weights 0.052–0.74 kg.

7. Installation Electro-Porcelain

• Manufactured by half-dry pressing per BDS 928 and DIN 40685.
• Materials include electro-porcelain and steatite.
• Applications in radio-electronics, military industry, and others.
• Production enhanced by Japanese granulating and double-acting pressing technology for diverse steatite products.

Material Standards and Quality

• All porcelain materials comply with IEC 672 and BDS 3934-86 standards.
• Dimensional tolerances follow DIN 40680 and DIN 40685.
• Glazing colors mainly brown and white, depending on product type.

Contact and Company Information

• Manufacturer: Elektroporcelain Ltd., Kazanlak, Bulgaria.
• Sales offices and warehouses in Sofia, Shumen, Lovech, and Targovishte.
• Contact: phone, fax, mobile, and email [email protected].

Critical Parameters and Recommendations

• Select insulator type based on rated voltage, current, and environmental conditions (dry or wet).
• Observe creepage distances and test voltages to ensure safety and reliability.
• Use porcelain with specified acid and alkali resistance for chemical industry applications.
• Follow installation guidelines and dimensional tolerances to maintain mechanical and electrical integrity.

Summary

ELECTROPORCELAIN Ltd provides a comprehensive range of high-quality porcelain insulators and related products compliant with international and national standards. Their offerings cover a wide voltage range and diverse applications in electrical infrastructure, supported by rigorous testing and quality control to ensure performance and safety.