252kV Porcelain Housed Cable Entry Type Bushing

Our 252kV porcelain housed cable entry type bushings feature dry-type capacitive cores with high-strength porcelain housing, designed for cable entry/exit insulation in EHV transformers, reactors, and GIS applications.

• Rated voltage 252kV with current options from 630A to 2000A; creepage distance up to 7200mm ensures superior insulation in polluted environments.

• Partial discharge ≤5pC at 1.5 Um/√3 kV; dielectric loss factor ≤0.4%; power frequency withstand 460kV; lightning impulse withstand 1050kV.

• Tin-plated copper terminals provide low contact resistance; suitable for altitudes up to 2500m.

• Maintenance-free design with long service life; compliant with IEC 60137 standards.

• Fast delivery, reliable quality, responsive service, and extensive project experience backed by our company.

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Product Overview

The 252kV Porcelain-Housed Cable Bushing is a key cable entry insulation component specifically designed for 252kV extra-high voltage (EHV) transmission systems. It incorporates a dry-type capacitive core combined with a high-strength porcelain housing, providing an integrated insulation solution suitable for cable entry or exit applications in transformers, reactors, and Gas Insulated Switchgear (GIS). The product delivers excellent electrical insulation performance, mechanical strength, and weather resistance, meeting the stringent safety and reliability requirements of EHV systems.

This series is available in multiple rated current levels (e.g., 630A, 1250A), allowing adaptation to equipment with varying capacities. Suitable for operation in medium to high altitude regions, it serves as a maintenance-free, long-life core insulation component in EHV transmission and distribution systems.

Technical Specifications

Model	CBRG-252/630	CBRG-252/1250	CBRG-252/2000	CBRGL-252/630	CBRGL-252/1250	CBRGL-252/2000
Rated Voltage	252 kV	252 kV	252 kV	252 kV	252 kV	252 kV
Rated Current	630 A	1250 A	2000 A	630 A	1250 A	2000 A
Creepage Distance	≥6500 mm	≥6800 mm	≥7000 mm	≥6600 mm	≥6900 mm	≥7200 mm
Altitude	≤2000 m	≤2000 m	≤2000 m	≤2500 m	≤2500 m	≤2500 m
Dielectric Dissipation Factor	≤0.4%	≤0.4%	≤0.4%	≤0.4%	≤0.4%	≤0.4%
External Insulation Material	Porcelain	Porcelain	Porcelain	Porcelain	Porcelain	Porcelain
Partial Discharge	≤5 pC	≤5 pC	≤5 pC	≤5 pC	≤5 pC	≤5 pC
Colour	Brown	Brown	Brown	Brown	Brown	Brown
Power Frequency Withstand Voltage	460 kV	460 kV	460 kV	460 kV	460 kV	460 kV
Lightning Impulse Withstand Voltage	1050 kV	1050 kV	1050 kV	1050 kV	1050 kV	1050 kV
Terminal Material	Tin-plated copper	Tin-plated copper	Tin-plated copper	Tin-plated copper	Tin-plated copper	Tin-plated copper

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252kV Composite Housed Cable Entry Type Bushing

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