Nexans Euromold Bushings & Connectors – How To Select & Specify MV HV Switchgear & Transformer Connectors

Published 13 Mar 2018

Uploaded By Chris Dodds – Thorne & Derrick Sales & Marketing Manager

Euromold Bushings

What Is The Function Of Bushings?

Bushings are electrical equipment devices designed to distribute electric power and energy through a grounded barrier, such as the wall of a transformer or switchgear. The Euromold epoxy bushings provide an insulated and screened connection between the conductors in the equipment and conductor of the cable.

Nexans Euromold are world leaders in the manufacture of Screened Separable Connectors to enable the safe termination of medium voltage and high voltage power cables onto outer cone bushings of electrical equipment including switchgear, transformers and motors up to 66kV – cable connectors for the termination of MV-HV cables into gas insulated switchgear are also available with inner cone bushings, see inner cone plugs.

Euromold connectors are approved by leading gas insulated switchgear and electrical equipment manufacturers including ABB, Schneider, Brush and Siemens.

All Nexans Euromold connectors are 100%  AC withstand and partial discharge tested at Nexans factory prior to shipment.

Euromold bushings are deadbreak bushings for de-energised systems – the power has to be switched off before the connector can be disconnected from the bushing.

The following article enables the correct selection and specification of Nexans Euromold connectors depending on a) cable specification and b) electrical equipment bushing type (A, B, C, D, E or F). The diameter over the core insulation of the cable to be terminated is critical to the reliable performance of separable connectors.

T&D provide an informative overview of the 6 Bushing Interfaces common to MV-HV electrical equipment with dimensions according to European CENELEC EN 50180 and 50181 – this should benefit the electrical design engineer, project manager, project engineer and cable jointer.

Some tips and hints are provided by kind courtesy of the Nexans UK Team.

Nexans Euromold Separable Connectors

Features & Benefits

• Compact Cable Terminations: Fully screened enabling connectors to be installed in close proximity to surrounding steel work and other connectors. Connectors can be touching if required
• Electrical Safety: Safe to touch and weatherproof. Euromold connectors offer excellent mechanical strength
• System Flexibility: The connectors can be disconnected and re-used making the movement of equipment possible without having to re-terminate MV-HV cables
• Ease Of Installation: Nexans Euromold connectors are suitable for use on all polymeric screened MV cable types up to 42kV/66kV

Nexans Euromold connectors must be fitted onto the correct bushing when installed and can be used to terminate both single and 3 core medium voltage cables.

Multiple medium/high voltage cables can be connected per bushing by double-stacking or “piggy-backing” providing flexible solutions to complex cable termination applications.

Bushing Interfaces

The MV-HV electrical equipment to which Nexans Euromold connectors are fitted to must have the correct bushing Interface and be designed to suit the cable specification.

Euromold connectors are suitable for connecting single and 3 core polymeric insulated cables with copper wire or tape screens up to 33kV – this has recently been increased to 66kV/72kV to cater for offshore wind farm cable terminations onto 66kV equipment in wind turbines.

Euromold Overview

• 180AR-1 – Interface A1 equipment bushing
• 180AR-2 – Interface A1 equipment bushing
• 180AR-3 – Interface A1 equipment bushing
• 180A-24P-O – Interface A1 in-air bushing
• 400T1 – Interface B2 equipment bushing
• 400AR-1 – Interface B2 equipment bushing
• 400AR-2 – Interface B2 equipment bushing
• 400AR-8 – Interface B1 equipment bushing
• 400SFR-P – Interface B2 equipment bushing
• 400AR-3 – Interface C1 equipment bushing
• 400AR-4 – Interface C2 equipment bushing
• 400AR-5 – Interface C2 equipment bushing
• 400AR-6 – Interface C1 equipment bushing
• 400SFR-B – Interface C2 equipment bushing
• 400A-24B – Interface C1 in-air bushing
• 670AR-2 – Interface D2 equipment bushing
• 900AR-1 – Interface F3 equipment bushing
• 900AR-2 – Interface F2 equipment bushing
• 900AR-3 – Interface F1 equipment bushing
• 900AR-4 – Interface F1 equipment bushing

Short circuit ratings for Interface Bushings

Euromold Connectors 200 Series

Interface Type A Bushing

• Connector Type :  7.9mm Plug-In Pin Contact
• Voltage Range : 11/12kV-24kV
• Current Rating : 250amps
• Specification : CENELEC EN50180 & EN50181

Euromold 158LR Elbow Connectors are used with 200 Series Interface A Bushing – a Euromold 152SR straight connector option is also available.

Interface A can be identified by the 6 tabs common to 200amp load break systems typical to padmounted transformer applications.

Includes a push-on pin contact bail rather than bolt for connecting to unthreaded medium voltage bushings. The 200 series range of connectors for use with Interface A bushings are common to low powered 11kV transformers typically providing tap-off or direct feed of medium voltage power to remote locations.

➡ See Interface A Connectors & Bushings From Nexans Euromold

Euromold Connectors 400 Series

Interface Type B Bushing

• Connector Type : 14mm Plug-In Pin Contact
• Voltage Range : 11/12kV-33/36kV
• Current Rating : 400amps
• Specification : CENELEC EN50180 & EN50181

Euromold 400LR Elbow Connectors are used with 400 Series Interface B Bushing.

Interface B is common to France and French manufactured medium voltage electrical equipment and Alston Grid Turkey oil type transformers up to 33kV. Interface B bushings are pin-type connectors, not bolted, to the bushings..

➡ See Interface B Connectors & Bushings From Nexans Euromold

Euromold Connectors 400 Series

Interface Type C Compact Bushing

• Connector Type : M16 Bolted Copper Insert
• Voltage Range : 11/12kV-33/36kV
• Current Rating : 630amps | 1250amps
• Specification : CENELEC EN50180 & EN50181

Euromold 430TB Elbow Connectors are used with 400 Series Interface C Bushing.

Bolted M16 Nexans Euromold connectors suit 630amp switchgear systems and can be “piggy-backed” using couplers to terminate multiple cables per phase in compact switchgear – common to the UK switchgear market including both air and gas insulated type equipment.

The physical dimensions of the Interface C connectors are identical to the specification of Interface B design but with bolted contacts.

Interface C1 is 630Amp whereas Interface C2 is 1250Amp.

➡ See Interface C Compact Connectors & Bushings From Nexans Euromold

Video : Nexans Euromold 430TB Tee Connector 11kV-33kV

Euromold Connectors 400 Series

Interface Type C Symmetrical Bushing

• Connector Type : M16 Bolted Copper Insert
• Voltage Range : 11/12kV-42kV
• Current Rating : 1250amps
• Specification : CENELEC EN50180 & EN50181

  ➡ See Interface C Symmetrical Connectors & Bushings From Nexans Euromold

Euromold Connectors 600 Series

Interface Type D Bushing 800Amp

• Deadbreak Connector Type : Bolted 5/8″ Aluminum Stud
• Voltage Range : 12kV-25kV
• Current Rating : 800amps
• Specification : CENELEC EN50180 & EN50181
• Specification : ANSI / IEEE 386 & 404

Type D Bushing – 1250Amp

• Deadbreak Connector Type : Bolted 5/8″ Copper Stud
• Voltage Range : 12kV-25kV
• Current Rating : 1250amps
• Specification : CENELEC EN50180 & EN50181
• Specification : ANSI / IEEE 386 & 404

Interface D bushing connectors are available in both 800A Aluminium (Interface D1) or 1250A Copper (Interface D2).

➡ See Interface D Connectors & Bushings From Nexans Euromold

Euromold Connectors 700 Series

Interface Type E Bushing 800 Amp 

• Deadbreak Connector Type : M16 Bolted Aluminium Insert
• Voltage Range : 12kV-42kV
• Current Rating : 800amps
• Specification : CENELEC EN50180 & EN50181
• Specification : ANSI / IEEE 386 & 404

Type E Bushing – 1250 Amp

• Deadbreak Connector Type : M16 Bolted Copper Insert
• Voltage Range : 12kV-42kV
• Current Rating : 1250amps
• Specification : CENELEC EN50180 & EN50181
• Specification : ANSI / IEEE 386 & 404

➡ See Interface E Connectors & Bushings From Nexans Euromold

Interface E bushing connectors are available in both 800A Aluminium (Interface E1) or 1250A Copper (Interface E2).

Euromold Connectors 900 Series

Interface Type F Bushing 2500 Amp 

• Connector Type : M16 Bolted Copper Insert
• Voltage Range : 12kV-42kV-66kV
• Current Rating : 2500amps
• Specification : CENELEC EN50180 & EN50181

➡ See Interface F Connectors & Bushings From Nexans Euromold

Interface F bushing connectors are available in 630A (Interface F1), 1250A (Interface F2) and 2500A (Interface F3) with tee connector design and supporting range of coupling connectors up to 66kV.

As a rule, ANSI specification type Interface D and Interface E connectors are usually black coloured whereas types A, B & C are orange-brown in colour.

Nexans Euromold surge arresters can be provided depending on the medium voltage earthing system design.

 ♦ Further Reading About Bushings & Connectors Applications

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