Oil Refill Cable Joints MV | Paper Cables (PILC)

Lovink Oil Refill Cable Joint for MV Cables 11kV 33kV

Lovink LoviSil Medium Voltage Oil Refill Cable Connection

Paper-Insulated Networks & Modern Polymeric Cable Systems Transition Joint

Lovink LoviSil® Oil Refill Cable Joints MV | Paper Cables (PILC)

Product Code: LoviSil® Oil Refill Joint (Module Selection Required)

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Lovink LoviSil® Oil Refill Cable Joint is purpose-designed for medium voltage (MV) networks where paper-insulated lead covered (PILC) cables require a maintained oil supply to preserve long-term dielectric performance. Suitable for system voltages from 6/10 (12) kV up to 18/30 (36) kV, this specialist joint enables continued operation of aging PILC infrastructure within modern 11kV and 33kV distribution networks.

Engineered using proven LoviSil® liquid silicone technology, the oil refill joint incorporates a dedicated manifold and non-return valve system that allows connection to an external oil reservoir. This ensures continuous oil saturation of the paper insulation, preventing drying-out and significantly extending cable service life. The modular joint system accommodates 3-core PILC cables and transition configurations to polymeric systems (subject to correct module selection and cable dimensions).

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Product Overview
Technical Specifications
Key Benefits
Applications
Notes & Selection

MV Paper Insulated Cable Joints (PILC)

The Lovink LoviSil® Oil Refill Cable Joint is a specialist medium voltage (MV) joint developed to maintain the integrity of paper-insulated lead covered (PILC) cable systems. It is specifically engineered for situations where the original oil feed to a PILC cable is interrupted due to network modification, transition works or infrastructure upgrades.

Continuous Oil Supply Technology

Unlike standard straight or transition joints, the LoviSil® Oil Refill Joint incorporates a dedicated oil manifold with non-return valve to enable connection to an external oil reservoir. This allows controlled and continuous replenishment of insulating oil within the paper dielectric, preventing dehydration of the insulation and reducing the risk of premature failure. The joint combines this oil management system with proven LoviSil® liquid silicone insulation and a robust resin-encapsulated outer shell for long-term environmental protection.

6/10 (12) kV – 18/30 (36) kV MV Networks

Suitable for 6/10 (12) kV up to 18/30 (36) kV systems, the oil refill joint supports medium voltage networks commonly referred to as 11kV and 33kV distribution circuits. It is primarily applied to 3-core PILC cables, including configurations where legacy paper-insulated networks must remain operational alongside modern polymeric infrastructure. This makes it particularly valuable for asset life extension programmes, refinery and industrial environments, and utility networks where full cable replacement is not practical.

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 OIL REFILL Cable Joint – Technical Specifications

Lovink LoviSil® Oil Refill Cable Joint (MV) – Technical Specifications

Primary Keyword	Oil Refill Cable Joint (Medium Voltage PILC Joint)
Voltage Rating	6/10 (12) kV – 18/30 (36) kV
Primary Cable Type	Paper-Insulated Lead Covered (PILC) cables
Transition Capability	PILC to Polymeric (XLPE / EPR) configurations available (subject to module selection)
Core Configuration	Primarily 3-core constructions (dependent on cable design)
Conductor Size Range	Typically 35 mm² – 400 mm² (dependent on joint type and cable module)
Oil Management System	Integrated manifold with non-return valve for connection to external oil reservoir
Insulation Technology	LoviSil® liquid silicone dielectric with polyurethane resin encapsulation
Installation Method	Cold-applied modular system (no heat shrink, no soldering required)
Typical MV Networks	11kV and 33kV distribution networks requiring asset life extension of PILC infrastructure

Final joint selection depends on cable insulation condition, sheath type, conductor size, and existing oil supply configuration.
Correct module combination (base, cable, resin and oil refill components) is essential for maintaining long-term dielectric performance.
Oil reservoir design, pipework routing and maintenance access should be considered during project planning.
Always confirm suitability for 11kV / 33kV systems in accordance with project specifications and network operator requirements.

Application Range (Oil Refill Module Guide)

Module	Cable Type	Conductor Size (mm²)	Oil Refill Capability	Max Core Ø (mm)
M75	PILC (3 core)	35 – 150mm²	Integrated manifold & valve connection	Up to 72
M75	PILC to XLPE/EPR (transition with oil refill)	35 – 120mm²	External oil reservoir compatible	Up to 72
M85	PILC (3 core)	95 – 240mm²	Integrated manifold & valve connection	Up to 82
M85	PILC to XLPE/EPR (transition with oil refill)	95 – 185mm²	External oil reservoir compatible	Up to 82
M105	PILC (3 core)	95 – 400mm²	Integrated manifold & valve connection	Up to 105
M105	PILC to XLPE/EPR (transition with oil refill)	95 – 300mm²	External oil reservoir compatible	Up to 105
MK125	PILC (3 core – large diameter)	150 – 500mm²	Integrated manifold & valve connection	Up to 120

This module guide is specific to PILC oil-supplied cable systems where insulation saturation must be maintained.
Selection depends on conductor size, lead sheath diameter, armour construction and overall cable dimensions.
Oil reservoir positioning, pipework routing and long-term access for maintenance should be considered during project design.
For 11kV and 33kV distribution networks, always verify the correct module and oil refill configuration in accordance with system ratings and DNO requirements.

Construction & Installation Notes (MV Oil Refill Joint)

Protection Concept	Heavy-duty outer shell combined with polyurethane resin encapsulation and LoviSil® liquid silicone insulation to protect against moisture ingress, mechanical stress and contaminated soil conditions
Oil Refill System	Integrated oil manifold with non-return valve connection, enabling controlled connection to an external oil reservoir to maintain paper insulation saturation
Installation Approach	Structured modular build-up with pre-engineered components to ensure consistent installation quality on PILC cable systems
Tools & Method	Cold-applied system using standard jointing tools; no heat shrinking required (follow project specification for any additional mechanical or bonding requirements)
Modular Construction	Base module + cable module + resin module + oil refill components, allowing flexible adaptation to varying PILC cable constructions and dimensions
Design Considerations	Oil reservoir positioning, pipe routing, pressure head and long-term maintenance accessibility must be considered during installation planning

For successful installation of an Oil Refill Cable Joint, confirm: cable type (PILC), conductor size, insulation condition, lead sheath diameter, armour construction, outer serving, oil supply configuration and installation environment. Correct module selection ensures reliable performance on 11kV and 33kV medium voltage networks where maintaining dielectric oil saturation is critical to long-term service life.

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).

Oil Refill Cable Joint – Key Benefits

✔ Purpose-built Oil Refill Cable Joint for maintaining dielectric oil saturation in PILC medium voltage cables

✔ Integrated manifold and non-return valve system enables controlled connection to an external oil reservoir

✔ Extends service life of ageing 11kV and 33kV paper-insulated cable infrastructure

✔ Designed for MV systems from 6/10 (12) kV to 18/30 (36) kV

✔ Combines proven LoviSil® liquid silicone insulation with resin encapsulation for long-term environmental protection

✔ Cold-applied modular installation – no heat shrink technology required

✔ Engineered specifically for 3-core PILC cables, including transition configurations where required

✔ Reduces the need for full cable replacement in asset life extension projects

✔ Suitable for utility, industrial, refinery and infrastructure networks where oil-fed cables remain in service

✔ Modular system design allows adaptation to varying conductor sizes, sheath constructions and site conditions

Applications

✔ Maintenance and reinstatement of oil-fed PILC medium voltage cables where original oil supply systems have been interrupted

✔ Asset life extension of ageing 11kV and 33kV paper-insulated distribution circuits

✔ Utility and DNO networks retaining legacy oil-impregnated cable infrastructure

✔ Industrial facilities, refineries and petrochemical sites operating oil-filled MV cable systems

✔ Substation upgrades where sections of PILC cable require continued dielectric oil saturation

✔ Network modifications requiring integration of an external oil reservoir and refill system

✔ Critical infrastructure projects where full cable replacement is impractical or cost-prohibitive

✔ MV installations requiring robust mechanical protection and long-term environmental sealing in buried conditions

Oil Refill Cable Joint – Additional Information

LoviSil® Oil Refill Cable Joints for MV networks (commonly referenced as 11kV and 33kV class) are engineered specifically for paper-insulated lead covered (PILC) cables that depend on dielectric oil saturation for long-term reliability. The system combines liquid silicone insulation with an integrated oil manifold and non-return valve, allowing the joint to be connected to an external oil reservoir. This configuration helps maintain insulation integrity where the original oil feed has been interrupted due to network modification or ageing infrastructure. By preserving oil saturation within the paper dielectric, the joint supports continued operation of critical MV circuits without full cable replacement.

For 36 kV class applications, LoviSil® Oil Refill Joints incorporate geometric field control using pre-engineered stress control components. Combined with fluid silicone surrounding the connector and insulation build-up, this enables controlled electric field distribution within a compact, resin-encapsulated construction. The result is a mechanically robust MV joint suitable for buried environments and demanding industrial conditions.

Oil Refill Manifold System - MV PILC Joint

Integrated Oil Refill System

Built-in manifold and valve connection enables connection to an external oil reservoir, helping maintain dielectric oil levels within PILC cables and reducing the risk of insulation dehydration.

Liquid Silicone Insulation - MV Oil Joint

Liquid Silicone Dielectric

Fluid silicone insulation surrounds and fills all internal components, minimising air voids and helping control electrical stress within the joint body.

Sealed & Mechanically Robust

Polyurethane resin encapsulation and rigid outer shells provide long-term moisture resistance and mechanical durability in buried or industrial environments. Systems are stated as tested to IEEE 404 and HD 629 (CENELEC).

✔ Maintains oil saturation: supports the dielectric performance of PILC insulation systems

✔ Extends asset life: reduces the need for disruptive and costly cable replacement

✔ Controlled electric field distribution: engineered stress control for MV networks up to 36 kV

✔ Resilient underground performance: sealed construction suited for buried installations

✔ Reduced outage risk: helps prevent failure associated with paper insulation drying

✔ Flame-free installation approach: cold-applied system suitable for industrial and petrochemical environments

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