20kV 22kV 24kV Cable GIS Termination

Modern medium-voltage power networks require cable termination systems that can provide reliable electrical insulation, controlled electric-field distribution, mechanical protection and long-term operational stability. As underground power distribution systems continue to expand, the connection between medium-voltage cables and gas-insulated switchgear has become increasingly important. UN 20kV 22kV 24kV Cable GIS Termination is specifically designed to connect medium-voltage XLPE cables to gas-insulated switchgear (SIG), transformateurs, circuit breakers and other electrical equipment. These terminations must accommodate different cable constructions, conductor sizes, insulation systems and equipment interfaces while maintaining stable electrical performance throughout the service life of the installation.

Pour les services publics, Entrepreneurs EPC, switchgear manufacturers and electrical contractors, selecting the correct GIS cable termination is essential for system reliability. A properly designed termination can minimize electrical stress, prevent partial discharge and provide a dependable interface between the cable insulation system and GIS equipment.

DOS Cable provides medium- and high-voltage cable accessories and customized cable termination solutions for international power transmission and distribution projects. Its engineering approach covers cable parameters, GIS interface requirements, installation conditions and applicable international standards.

What Is a 20kV 22kV 24kV Cable GIS Termination?

UN 20kV 22kV 24kV Cable GIS Termination is a cable accessory used to connect a medium-voltage power cable to gas-insulated switchgear or other electrical equipment. The termination creates a controlled transition between the cable’s insulation system and the GIS bushing or cable connection compartment.

Unlike a conventional outdoor termination, a GIS termination is normally installed inside or directly connected to a gas-insulated enclosure. The interface therefore requires high dimensional accuracy and carefully controlled electrical-field distribution.

Les applications typiques incluent:

• Medium-voltage GIS switchgear
• Gas-insulated substations
• Distribution substations
• Power transformers
• Sous-stations industrielles
• Renewable-energy collector systems
• Centres de données
• Mining and heavy industrial facilities
• Underground distribution networks
• Utility power distribution systems
• Commercial and infrastructure projects

Depending on the project requirements, un 20kV cable termination, 22kV cable termination ou 24kV cable termination may be designed for single-core or three-core XLPE-insulated cables.

Why Is GIS Cable Termination Important?

A power cable has a relatively uniform cylindrical insulation structure. When the cable enters a GIS enclosure, the geometry changes significantly around the conductor connection, insulation screen, metallic screen and grounding system.

This change in geometry can produce concentrated electrical stress.

If the electric field is not properly controlled, several problems may occur:

• Décharge partielle
• Electrical treeing
• Insulation degradation
• Surface discharge
• Local overheating
• Premature insulation failure
• Flashover
• Reduced service life

A high-quality medium voltage GIS termination therefore needs to control the electric field around the cable insulation and provide a smooth transition between the cable and GIS equipment.

The termination is not simply a mechanical connector. It is an engineered electrical component that forms part of the overall insulation system.

20Terminaison SIG du câble kV

UN 20Terminaison SIG du câble kV is commonly used in medium-voltage distribution systems where the nominal network voltage is around 20kV.

20kV networks are widely used in utility distribution systems, installations industrielles, renewable-energy installations and urban infrastructure. The actual cable voltage designation can vary according to the local electrical standard and network configuration.

A typical 20kV XLPE cable may include:

• Conducteur en cuivre ou en aluminium
• Écran conducteur
• Isolation XLPE
• Écran d'isolation
• Écran métallique
• Water-blocking components when required
• PE or other outer sheath

The corresponding 12/20kV GIS cable termination must be matched to the actual cable construction.

Important parameters include:

The exact design should always be selected according to the cable manufacturer’s dimensions and the GIS manufacturer’s interface requirements.

22Terminaison SIG du câble kV

UN 22Terminaison SIG du câble kV is designed for medium-voltage networks operating at approximately 22kV. This voltage level is particularly relevant in several international distribution systems and utility networks.

The increasing use of underground distribution cables has created greater demand for reliable 22kV cable accessories.

Un typique 22kV cable termination must provide:

1. Isolation électrique
2. Electric-field control
3. Reliable conductor connection
4. Metallic-screen continuity
5. Mechanical stability
6. Sealing against environmental contamination
7. Compatibility with the GIS interface
8. Long-term thermal performance

For XLPE-insulated cables, the stress-control component is particularly important because the termination creates a transition from the cable’s semiconductive insulation screen to the grounded or insulated GIS structure.

When designing a 22Terminaison SIG du câble kV, the cable dimensions should be verified before production. The most important dimensions normally include conductor diameter, insulation diameter, insulation-screen diameter, cable outer diameter and metallic-screen construction.

24Terminaison SIG du câble kV

UN 24Terminaison SIG du câble kV is used for medium-voltage systems with equipment or network ratings around 24kV.

24kV-class equipment is frequently associated with medium-voltage distribution networks where the equipment insulation level is higher than the nominal operating voltage. Pour cette raison, engineers should distinguish between the network operating voltage, maximum system voltage and equipment voltage rating.

UN 24Terminaison kV SIG needs to be coordinated with the GIS equipment insulation level and the applicable test requirements.

Les applications typiques incluent:

• Sous-stations de services publics
• Systèmes électriques industriels
• Renewable-energy substations
• Wind power collection systems
• Solar power collection networks
• Underground urban distribution
• Railway and transportation infrastructure
• Commercial power systems

For demanding projects, the termination may also be customized according to cable cross-section, matériau conducteur, screen design, GIS manufacturer and installation configuration.

Main Components of a GIS Cable Termination

Although the exact construction varies by manufacturer and voltage class, a medium-voltage GIS cable termination generally contains several critical components.

1. Stress-Control Component

The stress-control system is one of the most important parts of the termination.

It manages the electric-field concentration at the end of the cable insulation screen. Without appropriate stress control, the electric field can become excessively concentrated at the screen cutback.

Stress-control technology may use geometric stress control, resistive stress control, capacitive field grading or a combination of engineered materials and geometries.

2. Corps isolant

The insulating body provides the required dielectric insulation between energized components and grounded structures.

Caoutchouc de silicone, EPDM and other engineered insulating materials may be used depending on the termination design.

The material must maintain stable electrical and mechanical properties over the expected operating temperature range.

3. Connexion du conducteur

The conductor connection transfers electrical current from the cable conductor into the GIS equipment.

Depending on the system design, the conductor may be connected using a mechanical connector, compression connector or another approved connection system.

The connector must be compatible with the conductor material and cross-sectional area.

4. Cable Insulation Interface

The termination must fit precisely around the XLPE insulation.

The interface between the termination and cable insulation is particularly important because microscopic air gaps or contamination can increase the risk of partial discharge.

Proper preparation and installation are therefore essential.

5. Metallic Screen Connection

The cable metallic screen must be connected according to the system grounding and bonding arrangement.

Depending on the cable design, the screen may consist of:

• Copper wires
• Copper tape
• Aluminum foil
• Gaine de plomb
• Gaine en aluminium
• Other metallic layers

The termination must provide a reliable connection between the cable screen and the grounding system.

6. Système d'étanchéité

A reliable sealing structure helps prevent moisture and contaminants from entering sensitive interfaces.

This is particularly important for installations where the cable termination is exposed to humid environments, condensation or long-term temperature cycling.

XLPE Cable GIS Termination for 20kV, 22kV and 24kV Systems

XLPE is one of the most widely used insulation materials for medium-voltage power cables.

A typical XLPE cable has a multilayer structure consisting of the conductor, conductor screen, Isolation XLPE, insulation screen and metallic screen.

Le XLPE cable GIS termination must preserve the electrical characteristics of this insulation system while creating a controlled interface with GIS equipment.

The cable preparation process generally involves carefully removing the outer sheath, metallic screen and semiconductive insulation screen to specified dimensions.

The XLPE insulation surface must remain smooth and free from scratches, contamination and excessive material removal.

The insulation-screen cutback is particularly important because the stress-control component must be positioned accurately.

Incorrect cable preparation can cause:

• High electric-field concentration
• Décharge partielle
• Interface defects
• Tracking
• Premature failure

Pour cette raison, installation instructions should always be followed precisely.

20kV vs 22kV vs 24kV GIS Cable Termination

Although these three voltage classes are relatively close, they should not automatically be considered interchangeable.

The most important point is that the voltage designation alone is not enough to select a termination.

Engineers should also verify:

• Maximum system voltage
• Rated withstand voltage
• Lightning impulse withstand level
• Cable conductor size
• Cable insulation thickness
• Cable insulation diameter
• Metallic-screen construction
• GIS bushing interface
• Conductor connection dimensions
• Environnement d'installation
• Earthing arrangement

GIS Termination and Electric-Field Control

Electric-field control is fundamental to the performance of a GIS cable termination.

At the end of the cable’s semiconductive screen, the electric field would otherwise become concentrated. The stress-control system redistributes this field and reduces local electrical stress.

This is particularly important in medium-voltage systems because a cable termination can operate continuously for many years under thermal, electrical and mechanical stresses.

The design must consider:

• Electric-field distribution
• Interface pressure
• Insulation geometry
• Material dielectric properties
• Température
• Cable expansion
• Manufacturing tolerances
• Installation tolerances

Computer-aided electric-field analysis can be used during product development to optimize the termination geometry.

Cable and GIS Interface Compatibility

One of the most important considerations when selecting a 20kV 22kV 24kV Cable GIS Termination is compatibility with the GIS equipment.

Different GIS manufacturers may use different interface dimensions and connection arrangements.

Donc, a termination should not be selected solely based on the nominal voltage.

The following information is normally required:

Cable information

• Fabricant
• Type de câble
• Tension nominale
• Matériau conducteur
• Section du conducteur
• Diamètre du conducteur
• XLPE insulation thickness
• Insulation diameter
• Insulation-screen diameter
• Metallic-screen type
• Cable outer diameter

GIS information

• GIS manufacturer
• GIS model
• Cable connection type
• Bushing/interface dimensions
• Conductor connection arrangement
• Earthing arrangement
• Installation orientation
• Required clearances

This information allows the termination manufacturer to confirm compatibility before production.

Standards for Medium-Voltage GIS Cable Terminations

The applicable standards depend on the voltage level, country, cable system and GIS equipment.

For medium-voltage cable systems, relevant IEC standards may include standards covering power cables, cable accessories and high-voltage switchgear and controlgear.

For GIS equipment and cable connections, CEI 62271 series standards can be particularly relevant, while the specific cable system may need to comply with the applicable IEC cable standard.

The exact test program should be established according to the project specification and applicable standard.

Typical qualification and routine testing may include:

• Test de tension de tenue CA
• Test de décharge partielle
• Lightning impulse test where applicable
• Insulation tests
• Contrôle dimensionnel
• Mechanical inspection
• Material inspection
• Leakage or sealing inspection where applicable

A professional manufacturer should provide test documentation corresponding to the supplied product and project requirements.

Partial Discharge Performance

Partial discharge is one of the most important concerns for high-quality cable accessories.

A localized electrical discharge can occur when there is an electrical defect, void, interface problem or excessive electric-field concentration.

Although individual discharge events may be small, repeated partial discharge can gradually damage insulation.

Pour cette raison, partial-discharge performance is an important consideration when evaluating a 20Terminaison SIG du câble kV, 22Terminaison SIG du câble kV ou 24Terminaison SIG du câble kV.

Good manufacturing practices should include:

• Clean assembly environment
• Accurate component dimensions
• Controlled material properties
• Proper interface pressure
• Smooth insulation surfaces
• Accurate stress-control positioning
• Strict quality inspection

Installation of a 20kV 22kV 24kV Cable GIS Termination

Installation quality can significantly influence the service life of a GIS termination.

A typical installation process includes several stages.

Étape 1: Confirm Cable and GIS Parameters

Avant l'installation, verify the cable dimensions and GIS interface.

Do not begin cable preparation until all critical dimensions have been confirmed.

Étape 2: Prepare the Cable

Remove the outer sheath and metallic screen according to the manufacturer’s installation drawing.

The cable should be handled carefully to prevent damage to the XLPE insulation.

Étape 3: Prepare the Insulation Screen

The semiconductive insulation screen is removed to the specified cutback dimension.

The exposed XLPE surface should be clean, smooth and free from scratches.

Étape 4: Install the Stress-Control System

The stress-control component is positioned according to the specified dimensions.

Incorrect positioning can negatively affect electric-field distribution.

Étape 5: Install the Insulating Body

The insulating component is installed over the cable insulation and stress-control area.

The interface should be free of contamination.

Étape 6: Connect the Conductor

The conductor is connected to the GIS terminal using the specified connection method.

The connection must meet the required mechanical and electrical requirements.

Étape 7: Connect the Metallic Screen

The cable screen is connected to the designated grounding system.

The bonding arrangement must follow the project design.

Étape 8: Complete the GIS Connection

The termination is connected to the GIS cable compartment or bushing.

Mechanical dimensions and connection torque should be verified.

Étape 9: Perform Electrical Testing

Après l'installation, the completed cable system should undergo the required inspection and electrical testing according to the project specifications.

How to Choose a GIS Cable Termination Manufacturer

Choisir le bon GIS termination manufacturer is critical for medium-voltage projects.

Price is only one factor. A termination manufacturer should also have engineering capabilities, production control and experience with different cable constructions.

When evaluating a supplier, considérer:

Cable Compatibility

The manufacturer should be able to accommodate different conductor sizes and cable constructions.

GIS Interface Experience

Experience with different GIS manufacturers and connection interfaces can reduce engineering risk.

Conception électrique

The manufacturer should have the ability to analyze electric-field distribution and optimize stress-control geometry.

Contrôle de qualité

Manufacturing quality has a direct influence on termination reliability.

Testing Capability

The supplier should have appropriate testing equipment and documented quality procedures.

Customization

International projects often require customized dimensions, connection systems or installation arrangements.

A capable supplier should be able to manufacture according to approved technical drawings rather than offering only standard catalog products.

Why Choose Dosense Cable?

Dosense Cable is an international cable manufacturer and cable-accessory supplier serving customers in power distribution, transmission de puissance, industrial and infrastructure markets.

For customers looking for a 20Terminaison SIG du câble kV, 22Terminaison SIG du câble kV ou 24Terminaison SIG du câble kV, engineering compatibility is often more important than simply selecting a nominal voltage.

Dosense Cable can develop cable accessory solutions based on the customer’s actual cable construction and GIS interface requirements.

The engineering process can consider:

• Cable voltage
• Matériau conducteur
• Section du conducteur
• XLPE insulation thickness
• Diamètre du câble
• Insulation-screen dimensions
• Metallic-screen construction
• GIS interface
• Installation conditions
• Project standards
• Testing requirements

This approach allows the termination to be matched to the complete cable system rather than treating the termination as an independent component.

For EPC contractors and electrical equipment manufacturers, customized engineering support can also help simplify procurement and installation.

Applications of 20kV, 22kV and 24kV GIS Terminations

Medium-voltage GIS cable terminations are used in a wide range of applications.

Réseaux de distribution de services publics

Electric utilities use GIS equipment where space limitations, environmental conditions or reliability requirements make gas-insulated switchgear attractive.

Énergie renouvelable

Solar and wind power projects commonly use medium-voltage collector networks. Reliable cable terminations are required at the interface between collector cables, transformers and switchgear.

Industrial Plants

Large industrial facilities often require compact and reliable medium-voltage substations.

Data Centers

Data centers require highly reliable power distribution systems, and GIS can help provide compact electrical infrastructure.

Urban Substations

Dans les zones densément peuplées, GIS allows substations to occupy less space than many conventional air-insulated systems.

Projets d'infrastructures

Railways, airports, tunnels, hospitals and large commercial developments can also use medium-voltage GIS systems.

Common Questions About 20kV 22kV 24kV Cable GIS Termination

Is a 20kV GIS termination the same as a 22kV GIS termination?

Not necessarily. Although the voltage levels are close, the required insulation level, GIS interface and project standards may be different. The complete system parameters should be verified before selecting the termination.

Can one GIS termination be used for different cable sizes?

A termination may be designed for a specific range of cable dimensions, but compatibility must be confirmed. Cable insulation diameter, conductor dimensions and screen construction are especially important.

Can GIS terminations be used with XLPE cables?

Oui. XLPE-insulated medium-voltage cables are commonly used with GIS cable termination systems.

Can copper and aluminum conductors use the same termination?

The termination concept may be similar, but the conductor connector must be compatible with the conductor material and cross-section.

What information should I provide when requesting a quotation?

At minimum, provide:

• Voltage rating
• Cable conductor material
• Section du conducteur
• Cable construction
• XLPE insulation thickness
• Cable outer diameter
• Metallic-screen type
• GIS manufacturer
• GIS model
• Required quantity
• Applicable standard
• Project location

Providing a cable datasheet and GIS interface drawing is even better.

Conclusion

A reliable 20kV 22kV 24kV Cable GIS Termination is an important component of a modern medium-voltage electrical network. It provides the electrical, mechanical and interface connection between XLPE power cables and gas-insulated switchgear while controlling electric-field concentration around the cable insulation.

Whether the project requires a 20Terminaison SIG du câble kV, 22Terminaison SIG du câble kV ou 24Terminaison SIG du câble kV, the correct solution must be selected according to the complete cable system and GIS interface rather than the voltage rating alone.

Cable dimensions, insulation structure, matériau conducteur, metallic screen, GIS interface, electrical stress control, installation conditions and applicable standards should all be considered during engineering and procurement.

Pour les services publics, Entrepreneurs EPC, switchgear manufacturers and electrical distributors, working with an experienced GIS termination manufacturer can reduce compatibility risks and improve project reliability.

DOS Cable provides customized medium-voltage and high-voltage cable solutions and cable accessories for international projects. For a 20kV, 22kV or 24kV GIS cable termination, customers can provide the cable datasheet and GIS interface information for technical evaluation and product selection.