33kV 36kV Cable GIS Terminal – Accessories manufacturer

What Is a 33kV 36kV Cable GIS Terminal?

A 33kV Cable GIS Terminal is a medium-voltage cable termination designed to connect 33kV XLPE power cables to Gas Insulated Switchgear (GIS). It provides electrical insulation, electric field control, mechanical support, and a completely sealed connection between the cable and the GIS equipment.

Similarly, a 36kV Cable GIS Terminal is engineered for systems with a maximum operating voltage of 36kV, meeting IEC medium-voltage requirements while ensuring safe and reliable power transmission.

Compared with conventional air-insulated terminations, GIS terminals offer superior insulation performance, compact dimensions, excellent environmental resistance, and minimal maintenance requirements. They are widely used in urban substations, renewable energy projects, industrial facilities, mining operations, and utility power distribution systems.

Why Choose a GIS Terminal?

As substations become more compact, utilities increasingly adopt GIS technology because of its high reliability and reduced installation space.

A 33kV Cable GIS Terminal offers several advantages:

• Compact installation
• Excellent electrical insulation
• High resistance to pollution
• Moisture-proof sealing
• Long service life
• Low maintenance cost
• High operational reliability
• Safe indoor and outdoor applications

These benefits also apply to 36kV Cable GIS Terminal systems.

Construction of a 33kV Cable GIS Terminal

A GIS cable termination consists of several precision-engineered components working together to control the electric field and ensure safe operation.

Typical construction includes:

• Stress cone
• Silicone rubber insulation body
• Conductive layer
• Copper or aluminum conductor connector
• Compression lug
• GIS plug-in interface
• Metallic housing
• Sealing rings
• Earthing connection
• Mounting flange

Every component is manufactured with strict dimensional tolerances to guarantee electrical performance throughout the product’s lifetime.

Main Components

Silicone Stress Cone

The stress cone is the heart of the GIS termination. It redistributes the electric field from the cable insulation to the GIS bushing, preventing localized electrical stress and partial discharge.

Insulation Body

High-grade silicone rubber provides outstanding dielectric strength, excellent hydrophobic properties, and resistance to UV radiation, ozone, and aging.

Connector

The conductor connector establishes a low-resistance electrical connection between the cable conductor and the GIS equipment.

Metallic Housing

The housing protects internal insulation from mechanical damage while maintaining proper grounding.

Sealing System

Multiple sealing rings prevent moisture, dust, and contaminants from entering the GIS enclosure.

Working Principle

The cable conductor transfers electrical energy into the GIS through the conductor connector.

Meanwhile:

• the stress cone smooths the electric field,
• the silicone insulation isolates high voltage,
• the conductive layer controls voltage distribution,
• the metallic enclosure provides shielding,
• the sealing system prevents moisture ingress.

The result is a highly reliable connection capable of operating continuously for decades.

Typical Technical Specifications

Typical values include:

Applications

A 33kV Cable GIS Terminal is widely used in:

• Utility substations
• Wind farms
• Solar power plants
• Hydropower stations
• Industrial plants
• Petrochemical facilities
• Data centers
• Railway power systems
• Metro power distribution
• Mining operations
• Airports
• Smart grid projects

The 36kV Cable GIS Terminal serves the same industries where slightly higher system voltages are required.

Advantages Over AIS Cable Terminations

Compared with Air Insulated Switchgear (AIS), GIS cable terminations offer numerous advantages.

Electrical Performance

Modern GIS cable terminations are designed to achieve excellent electrical characteristics, including:

• Low partial discharge level
• Uniform electric field distribution
• High dielectric strength
• Excellent impulse withstand capability
• Stable thermal performance
• Superior short-circuit resistance
• Long insulation life

These characteristics ensure stable operation under demanding conditions.

Mechanical Performance

Besides electrical performance, mechanical reliability is equally important.

Typical mechanical features include:

• High tensile strength
• Excellent vibration resistance
• Flexible installation
• Strong sealing performance
• Corrosion resistance
• Earthquake resistance
• Long-term dimensional stability

Installation Procedure

Proper installation is essential for reliable service.

Typical installation steps include:

1. Prepare the cable end.
2. Remove the outer sheath.
3. Strip the insulation according to the manufacturer’s dimensions.
4. Install the conductor connector.
5. Mount the stress cone.
6. Assemble the insulation body.
7. Connect the termination to the GIS bushing.
8. Tighten all bolts to the specified torque.
9. Connect the grounding system.
10. Perform electrical testing before energization.

Installation should always be carried out by trained technicians using specialized tools.

Testing Requirements

Before commissioning, every 33kV Cable GIS Terminal should undergo comprehensive testing.

Typical tests include:

• Visual inspection
• Dimensional inspection
• AC withstand voltage test
• Partial discharge test
• Lightning impulse test
• Heating cycle test
• Mechanical verification
• Tightness test
• Insulation resistance test
• Conductor resistance measurement

Routine factory testing ensures every termination meets the required quality standards.

Applicable Standards

High-quality GIS cable terminations are generally manufactured according to international standards such as:

• IEC 60840
• IEC 62271
• IEC 60060
• IEC 60270
• IEC 60529
• IEC 60228
• IEEE standards (where applicable)

Compliance with these standards guarantees product safety and interoperability.

Selecting the Right GIS Cable Terminal

When choosing a 33kV Cable GIS Terminal or 36kV Cable GIS Terminal, consider the following factors:

• System voltage
• Cable insulation type
• Conductor material
• Conductor cross-section
• GIS equipment manufacturer
• Interface dimensions
• Installation environment
• Pollution level
• Altitude
• Short-circuit rating
• Operating temperature

Selecting the correct model ensures optimal performance and long service life.

Maintenance Recommendations

Although GIS terminations require little maintenance, periodic inspections help maximize reliability.

Recommended maintenance includes:

• Visual inspection
• Ground connection verification
• Seal inspection
• Surface cleaning
• Infrared temperature monitoring
• Partial discharge monitoring
• Torque inspection

Preventive maintenance can significantly reduce unexpected outages.

Common Causes of Failure

Failures are uncommon but may result from:

• Incorrect installation
• Poor cable preparation
• Moisture ingress
• Excessive bending
• Loose conductor connections
• Mechanical damage
• Contamination
• Manufacturing defects
• Improper stress control

Following manufacturer instructions greatly reduces these risks.

Why Silicone Rubber Is Preferred

Modern GIS cable terminations primarily use silicone rubber because it offers:

• High dielectric strength
• Excellent elasticity
• Superior hydrophobicity
• UV resistance
• Ozone resistance
• Aging resistance
• Wide operating temperature range
• Stable long-term performance

These properties contribute to a service life exceeding 30 years under normal operating conditions.

Why Choose DOSENSE 33kV & 36kV Cable GIS Terminals?

DOSENSE provides high-performance GIS cable terminations designed for medium-voltage power systems worldwide.

Our advantages include:

• High-quality silicone insulation
• Precision electric field control
• IEC-compliant manufacturing
• Compatible with major GIS brands
• Factory routine and type testing
• Excellent sealing performance
• Fast delivery
• Technical engineering support
• OEM and customized solutions
• Reliable global project experience

Whether for utility substations, renewable energy projects, or industrial facilities, DOSENSE GIS cable terminations deliver safe, stable, and long-lasting performance.

Frequently Asked Questions

What is the difference between a 33kV and a 36kV Cable GIS Terminal?

A 33kV terminal is designed for 33kV distribution systems, while a 36kV terminal is rated for systems with a maximum operating voltage of 36kV. Their construction is similar, but electrical ratings and interface requirements may differ.

Can GIS terminals be installed outdoors?

They are typically connected to indoor GIS equipment. Outdoor use depends on the enclosure design and environmental protection provided by the installation.

What cable types are compatible?

Most GIS terminals are suitable for XLPE-insulated copper or aluminum conductor power cables.

How long does a GIS cable termination last?

With proper installation and maintenance, a high-quality GIS termination can operate reliably for more than 30 years.

Why is partial discharge testing important?

Partial discharge testing verifies insulation integrity and helps detect defects before the equipment is placed into service, improving long-term reliability.

Conclusion

The 33kV Cable GIS Terminal and 36kV Cable GIS Terminal are essential components for connecting medium-voltage power cables to Gas Insulated Switchgear safely and efficiently. Their compact design, advanced silicone insulation, excellent electric field control, and long service life make them the preferred solution for modern substations, renewable energy installations, industrial facilities, and smart grid infrastructure. By selecting high-quality GIS terminations manufactured to international standards and ensuring correct installation and testing, utilities and contractors can achieve reliable, low-maintenance, and long-lasting power transmission systems.