Cable Repair Joints MV | 11kV 33kV Cables

Lovink LoviSil Medium Voltage Cable Repair Joint

Provides a fast, reliable solution for repairing medium voltage (MV) power cables where limited damage has occurred

Lovink LoviSil® Cable Repair Joint | MV 6/10 (11) kV – 18/30 (33) kV

Product Code: LoviSil® Cable Repair Joint (Module Selection Required)

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Lovink LoviSil® Cable Repair Joint provides a fast, reliable solution for repairing medium voltage (MV) power cables where limited damage has occurred, eliminating the need to replace long cable sections. Designed for 11kV and 33kV networks (6/10 (12) kV to 18/30 (36) kV systems), the LoviSil® repair joint restores cable integrity using proven fluid silicone insulation technology trusted in MV distribution networks worldwide.

Suitable for both paper-insulated (PILC/PICAS) and polymeric (XLPE/EPR) cables, the repair system accommodates 1-core and 3-core constructions across a wide range of conductor sizes. By replacing only the damaged section with an extended connection system and silicone-filled joint body, the LoviSil® repair joint significantly reduces excavation time, downtime, and overall project cost compared to full cable replacement.

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Product Overview
Technical Specifications
Key Benefits
Applications
Notes & Selection

MV Joints for Repairing Damaged Cables (XLPE PILC)

The Lovink LoviSil® Cable Repair Joint is engineered specifically for the restoration of damaged medium voltage (MV) power cables without the need for full cable replacement. Designed for 11kV and 33kV distribution systems, it enables utilities and contractors to remove and replace only the affected cable section, significantly reducing downtime and excavation requirements.

Lovink Lovisil

At the core of the system is Lovink’s proven fluid silicone insulation, which fills voids and irregularities within the joint body to minimise partial discharge and maintain long-term electrical integrity. The repair assembly uses extended connectors and tube components to bridge the removed cable section, while the robust outer shell and polyurethane resin provide dependable mechanical and moisture protection — even in challenging underground environments.

6/10 (12) kV – 18/30 (36) kV Applications

Suitable for 6/10 (12) kV up to 18/30 (36) kV cable systems, the LoviSil® repair joint accommodates both paper-insulated (PILC/PICAS) and polymeric (XLPE/EPR) cables in 1-core and 3-core configurations. It is particularly effective where network reliability must be restored quickly following third-party damage, insulation faults or localised sheath failure, offering a controlled and sustainable alternative to replacing entire cable runs.

Need the right Cable Joints for your MV cables? Speak to our trusted experts to confirm suitability for your 11kV / 33kV class network application (as well as cable type, insulation, sheath/armour construction and dimensions). Thorne & Derrick International provide technical advice, quotations and fast worldwide delivery for MV joints, medium voltage cable accessories and engineered power solutions.

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MV Cable repair Joint – Technical Specifications

Lovink LoviSil® Cable Repair Joint (MV 11kV & 33kV) – Technical Specifications

Primary Application	Medium Voltage Cable Repair Joint for removal and reinstatement of locally damaged cable sections
Voltage Rating	6/10 (12) kV – 18/30 (36) kV (suitable for 11kV and 33kV systems)
Cable Insulation Types	Polymeric (XLPE / EPR) and Paper-Insulated (PILC / PICAS)
Core Configuration	1-core (3 x single-core) and 3-core cable constructions
Conductor Size Range	12 kV: 35 – 400 mm² 24 kV: 95 – 400 mm² (Final selection dependent on cable dimensions and module type)
Maximum Repair Length	Up to approx. 225 – 330 mm depending on conductor size
Installation Method	Cold-applied system using extended connectors and tube components – no heat shrinking or soldering required
Insulation & Sealing System	Fluid silicone insulation (LoviSil®) with polyurethane resin encapsulation and high-spec outer shell for mechanical protection
Standards & Testing	Tested in accordance with HD 629 (CENELEC) and IEEE 404, including 2 bar water pressure testing

Designed for repair of localised cable damage without replacing full cable sections.
Final joint configuration depends on cable insulation type, conductor size, screen construction and sheath dimensions.
Maximum removable cable length varies according to conductor cross-section.
Suitable for underground MV distribution networks including 11kV and 33kV utility systems.

Application Range (Repair Joint Module Guide)

Repair Module	Cable Type	Voltage Class	Conductor Size (mm²)	Max Repair Length (mm)
M105 (Repair)	Polymeric / Paper (3 × 1 core)	6/10 (12) kV	35 – 400mm²	Up to 330mm*
M105 (Repair)	Polymeric / Paper (3 core)	6/10 (12) kV	35 – 400mm²	Up to 330mm*
M105 (Repair)	Polymeric / Paper (3 × 1 core)	12/20 (24) kV	95 – 400mm²	Up to 270mm*
M105 (Repair)	Polymeric / Paper (3 core)	12/20 (24) kV	95 – 400mm²	Up to 270mm*

Maximum removable cable section varies according to conductor cross-section (smaller conductors allow longer repair sections).
Repair modules are selected based on cable insulation type, sheath diameter, conductor size and voltage class.
Suitable for underground MV distribution systems including 11kV and 33kV class networks.
For uncommon cable constructions or mixed network repairs, tailored cable modules may be available upon request.

Construction & Installation Notes (MV Cable Repair Joint)

Repair Concept	Designed to remove and replace a locally damaged section of MV cable without full cable replacement, restoring mechanical and electrical integrity.
Insulation Technology	Fluid LoviSil® silicone insulation providing homogeneous insulation rebuild and reliable stress control.
Mechanical & Environmental Protection	High-strength outer shell combined with polyurethane resin encapsulation for long-term resistance to moisture ingress, soil contamination and mechanical impact.
Connector System	Extended mechanical or compression connectors to bridge the removed cable section (selection dependent on conductor size and project specification).
Installation Method	Cold-applied jointing system with no heat shrinking or soldering required. Installation follows a structured build-up procedure using standard jointing tools.
Module Selection	Repair module selection is based on voltage class, conductor cross-section, cable insulation type, sheath construction and outer diameter.

For effective 11kV and 33kV cable repairs, confirm the damaged section length, conductor size, insulation type (PILC/PICAS or XLPE/EPR), screen/sheath construction, armour type and installation environment before specifying the joint.
Correct module configuration ensures safe reinstatement of the MV network and long-term operational reliability.

Lovink Cable Joints – Selection Guide

Lovink MV Cable Joints (Quick Guide)

Cable Joint Type	What it does (summary)	Voltage Class	Link
Transition Cable Joints	MV transition connections between paper-insulated cables (PILC/PICAS) and polymeric cables (XLPE/EPR) for mixed networks and upgrades.	6/10 (12) kV – 18/30 (36) kV (11kV / 33kV class)	View
Straight Cable Joints	Straight-through MV joint for cable-to-cable connections (same cable type): polymeric-to-polymeric (XLPE/EPR) or paper-to-paper (PILC/PICAS), selection dependent.	6/10 (12) kV – 18/30 (36) kV (11kV / 33kV class)	View
Stop-End Joints	MV pot-end / termination solution that converts a standard joint into a fully insulated, sealed stop-end for energised cable systems (polymeric and selected paper-insulated).	6/10 (12) kV – 18/30 (36) kV (11kV / 33kV class)	View
Branch Joints	Creates MV tees / take-offs on distribution networks to form branch connections for 11kV and 33kV class systems (module selection dependent).	6/10 (11) kV – 18/30 (33) kV (modules also shown up to 36kV)	View
Cable Repair Joints	Repairs MV power cables where limited damage has occurred by replacing only the affected section (supports PILC/PICAS and XLPE/EPR, selection dependent).	6/10 (12) kV – 18/30 (36) kV (11kV / 33kV class)	View
Extended Resin Cable Joints	Extended outer-shell MV straight-through / transition joint providing additional bonding space and enhanced sealing for buried/ducted/high-moisture installs (PILC/PICAS and XLPE/EPR, selection dependent).	6/10 (12) kV – 18/30 (36) kV (11kV / 33kV class)	View
Feed-In Cable Joints	Enables direct connection of renewable or distributed power sources into existing underground MV cable systems (supports XLPE/EPR and PILC/PICAS, selection dependent).	6/10 (12) kV – 18/30 (36) kV (11kV / 33kV class)	View
Loop Cable Joints	Internal looping joint for underground MV distribution, allowing two outgoing cables to be connected within one joint (space/time-saving vs external looping).	6/10 (12) kV – 18/30 (36) kV (11kV / 33kV class)	View
Oil Refill Cable Joints (PILC)	Specialist MV joint for paper-insulated lead covered (PILC) cables, using an oil manifold + non-return valve to connect to an external reservoir and keep the paper dielectric oil-saturated.	6/10 (12) kV – 18/30 (36) kV (11kV / 33kV class)	View
Crossbonding Cable Joints	Controls induced screen voltages and reduces circulating currents in long single-core MV circuits by integrating a flexible copper crossbonding conductor within the joint body.	12kV – 36kV (commonly 11kV / 33kV networks)	View
Compact Cable Joints	Compact straight-through MV joint for polymeric insulated single-core cables (XLPE/EPR), using cold-shrink technology and a sealed resin-filled housing for moisture protection in confined installs.	6/10 (12) kV & 12/20 (24) kV (often referenced as 11kV / 33kV class)	View

Voltage class references (e.g., “11kV / 33kV”) should always be matched to the actual cable system rating and the correct joint/module selection.
Final suitability depends on cable construction and dimensions (insulation type, sheath/armour, conductor size, and installation environment).

Cable repair Joint – Key Benefits

✔ Flexible Cable Repair Joint solution for quick restoration of damaged MV cables

✔ Accommodates various cable types and sizes: 1-core and 3-core, PILC, XLPE, or EPR insulation

✔ Rated for medium voltage up to 36 kV (6/10 (12) kV to 18/30 (36) kV)

✔ Superior environmental resistance: encapsulated with polyurethane resin and LoviSil® for water-tight sealing

✔ Pre-assembled modules simplify installation and ensure consistent joint quality

✔ Installation requires only standard tools; no heat-shrinking or soldering needed

✔ Modular design (base, cable, and resin sections) reduces inventory and simplifies repairs

✔ Electrically reliable insulation suitable for both legacy and modern MV network structures

✔ Custom cable modules available for non-standard or specialty cables

✔ Perfect solution for restoring service in mixed networks with paper-insulated and polymeric cables

Applications

✔ Fast MV cable restoration for PILC, PICAS and XLPE / EPR systems

✔ Repairs and maintenance in mixed-cable networks, bridging legacy paper and modern polymeric cables

✔ Distribution networks for utilities and private operators, including 11kV / 33kV installations

✔ Substations, switchrooms, and other critical power infrastructure requiring fast joint recovery

✔ Industrial facilities, renewable energy sites, and commercial MV cable networks

✔ Extending the operational life of existing paper-insulated MV cable circuits

✔ Joints where cable types, sizes, and armouring differ between sections of the circuit

✔ Applications demanding reliable protection from moisture, soil contamination, and harsh environmental conditions

Cable REPAIR Joint – Additional Information

Lovink Cable Repair Joints for MV networks (typically 11kV and 33kV class) utilise fluid silicone as the main insulation medium. The liquid silicone adapts to the internal geometry of the joint, penetrating voids and irregularities to ensure uniform insulation and minimise partial discharge risks. For paper-insulated cables (PILC/PICAS), the silicone supports the insulation by retaining moisture and preventing brittleness. For polymeric cables (XLPE/EPR), its electrical properties reduce the need for additional core-installed elements, simplifying installation and lowering the risk of errors.

In higher voltage applications up to 36 kV, Lovink joints employ geometric field management using filled stress cones. Together with a silicone sleeve surrounding the connection, this allows compact joint construction while maintaining safe and uniform field distribution.

Fluid Silicone Insulation

Liquid silicone adapts to the joint interior, filling voids and irregularities to deliver consistent insulation. Reduces the chance of air entrapment and partial discharges.

Geometric Field Management

Up to 36 kV, joints feature filled stress cones combined with a silicone sleeve to maintain uniform electric field and allow a compact joint design without wrapping.

Mechanical Protection & Testing

Durable outer shells with polyurethane resin provide long-term moisture resistance and enable full insulation testing. Verified to IEEE 404 and HD 629 (CENELEC), including water pressure testing at 2 bar.

✔ Consistent insulation: fluid silicone fills voids, reducing stress points and enhancing joint reliability

✔ Supports PILC/PICAS cables: preserves moisture in paper insulation, extending cable life

✔ Polymeric cable readiness: electrical properties reduce the need for extra core components

✔ Long-term reliability: proven field performance, low maintenance and extended service life

✔ Installer-friendly: pre-assembled components, clear sequence, visual filling check

✔ Safe installation: no heat or solder required, suitable for flame-sensitive or petrochemical environments

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