Selecting MV Bushings & Cable Connectors For Use With Schneider Switchgear (Medium Voltage)
Published 23 Jan 2018
Schneider Gas Insulated (SF6) Switchgear, RMU’s & MV Medium Voltage Electrical Equipment
-
Uploaded by Chris Dodds – reading time 8 minutes
Switchgear Bushings & Cable Connectors
The following information has been provided to enable to correct selection and specification of MV Bushings and Separable Connectors used to connect and terminate medium/high voltage power cables into Schneider RM6 gas insulated switchgear and Ring Main Units (RMU) up to 24kV.
General
- The profiles, contacts and dimensions of the Schneider RM6 connection interfaces are defined by the IEC 60137 standard
- 100% of the epoxy resin interfaces undergo dielectric testing at power frequency and partial discharge tests
- Insulated connectors must be used in order to guarantee the dielectric performance
Appropriateness For Use
Types of Connection Interface
The bushings carry the electrical current from the outside to the inside of the MV switchgear enclosure, which is filled with SF6 gas, ensuring insulation between the live conductors and the frame for MV power distribution.
There are 3 types of MV bushing, which are defined by their short-time withstand current:
- Type A Interface Bushing: 200 A: 12.5 kA 1 s and 31.5 kA peak (plug-in)
- Type B Interface Bushing: 400 A: 16 kA 1 s and 40 kA peak (plug-in)
- Type C Interface Bushing: 630 A: 25 kA 1 s, 21 kA 3 s + 62.5 kA peak (disconnectable M16)
➡ For further information on Euromold Connectors for all other Interface Bushings up to 66kV please see the following information:
 |
 |
 |
 |
 |
 |
The Euromold brand of MV Cable Connectors manufactured by Nexans for 11kV 33kV 66kV connection of medium/high voltage power cables into gas insulated electrical equipment.
How To Define The Cable Connectors Interface
The connection interfaces depend on specific criteria, such as:
Installation
- Current rating of the connected equipment: 200, 400, 630 A
- Short-time withstand current for 12.5 kA, 16 kA, 25 kA switch and circuit breaker functions
- For the fuse-switch combination function, as the short-circuit current is limited by the fuse, the connection interface will be of type A (200 A)
- Minimum phase expansion length
- Connection type: plug in: multicontact ring, disconnectable: bolted
- Output position: straight or elbow connectors
MV Medium Voltage Cable
- Specified voltage: of the cable, of the network
- Type of conductor: aluminium or copper
- Cross section in mm2
- Primary insulation diameter
- Cable composition: single-core or 3-core
- Insulation type: dry, paper impregnated (non-draining type)
- Type of screen: copper tape or copper wire screen
- Armour: SWA (steel wire armour), AWA (aluminium wire armour) or unarmoured (copper wire screened)
Gas Insulated Switchgear – Schneider RM6
- Stainless steel tank filled with SF6 gas, sealed for life and containing the medium voltage (MV) busbar and all live switching components such as the switch-disconnector, earthing switch, the fuse switch combination or the MV circuit breaker
- One of the five cable compartments with interfaces to connect to the network or medium voltage transformer
- User interface with single line diagram, actuators and LV components
- Manual or motorised operating mechanism compartments
- Earthing circuit with visible earthing contacts
Type A Bushing – Directed field plug-in connector
Dry single-core cable
| Performance | Cable Connection | Manufacturer | Connector Reference | Cross Section sqmm | Comments |
| 7.2 to 10 kV200 A -95 kV impulse | Plug-in | Euromold | Elastimold | 158LR | 16 to 120 | T-shaped elbow (Tee) |
| Euromold | Elastimold | 151SR | 16 to 120 | Straight, Q function only | ||
| Prysmian | FMCE 250 | 16 to 95 | |||
| 7.2 to 17.5 kV200 A -95 kV impulse | Plug-in | nkt cables GmbH | EASW 12/250 A | 25 to 95 | Shaped elbow connector |
| nkt cables GmbH | EASG 12/250 A | 25 to 95 | Straight | ||
| Tyco Electronics | RSES-52xx | 25 to 120 | Shaped elbow | ||
| Tyco Electronics | RSSS-52xx | 25 to 95 | Straight connection | ||
| 7.2 to 24 kV200 A -125 kV impulse | Plug-in | Elastimold | K158LR | 16 to 95 | T-shaped elbow connector (Tee) |
| 24 kV200 A -125 kV impulse | Plug-in | nkt cables GmbH | EASW 20/250 A | 25 to 95 | Shaped elbow |
| nkt cables GmbH | EASG 20/250 A | 25 to 95 | Straight connector | ||
| Tyco Electronics | RSES-52xx | 25 to 120 | Shaped elbow | ||
| Tyco Electronics | RSSS-52xx | 25 to 95 | Straight connector |
➡ Further information link: Elastimold Connectors
Type A/M8 bushing – Non-directed field disconnectable connector (*)
Dry single and 3-core cable
| Performance | Cable Connection | Manufacturer | Cable Termination Reference | Cross Section sqmm | Comments |
| 7.2 to 17.5 kV200 A -95 kV impulse | Heat Shrink Cable Termination | Tyco Electronics | EPKT + EAKT + RSRB | 16 to 150 | |
| Insulating Boots | ABB Kabeldon | KAP70 | 70 max |
(*) 520 mm plinth must be used
Type B bushing Directed field plug-in connector
Dry single-core cable
| Performance | Cable Connection | Manufacturer | Connector Reference | Cross Section sqmm | Comments |
| 7.2 to 10 kV400 A-95 kV impulse | Plug-in | Elastimold | Euromold | Euromold 400LR | 70 to 240 | Limited to Us = 10 kV |
| 7.2 to 17.5 kV400 A-95 kV impulse | Plug-in | nkt cables GmbH | CE 12-400 | 25 to 300 | |
| Tyco Electronics | RSES-54xx | 25 to 300 | Shaped elbow connector | ||
| 24 kV400 A-125 kV impulse | Plug-in | Prysmian | FMCE 400 | 70 to 300 | |
| Elastimold | Euromold | Euromold K400LR | 35 to 240 | |||
| ABB Kabeldon | SOC 630 | 50 to 300 | |||
| nkt cables GmbH | CE 24-400 | 25 to 300 | |||
| Tyco Electronics | RSES-54xx | 25 to 300 | Shaped elbow connector |
Type C bushing – Directed field disconnectable connector
Dry single-core cable
| Performance | Cable Connection | Manufacturer | Connector Reference | Cross Section sqmm | Comments |
| 7.2 to 10 kV630 A-95 kV impulse | Disconnectable | Elastimold | Euromold | Euromold 440TB | 70 to 240 | |
| 7.2 to 17.5 kV630 A-95 kV impulse | Disconnectable | nkt cables GmbH | CB 12-630 | 25 to 300 | |
| Tyco Electronics | RSTI-58xx | 25 to 300 | “T”-shaped connector (Tee) | ||
| 7.2 to 24 kV630 A-125 kV impulse | Disconnectable | Prysmian | FMCTs 400 | 70 to 300 | |
| Elastimold | Euromold | Euromold K400TB | 35 to 240 | |||
| ABB Kabeldon | SOC 630 | 50 to 300 | |||
| 24 kV630 A-125 kV impulse | Disconnectable | nkt cables GmbH | CB 24-630 | 25 to 300 | |
| Tyco Electronics | RSTI-58xx | 25 to 300 | “T”-shaped connector (Tee) |
Non-directed field disconnectable connector
Dry single and three-core cable
| Performance | Cable Connection | Manufacturer | Cable Termination Reference | Cross Section sqmm | Comments |
| 7.2 to 10 kV630 A -95 kV impulse | Heat Shrink Cable Termination | Tyco Electronics | EPKT + EAKT + RSRB | 16 to 300 | |
| Sigmaform | Q-CAP | 16 to 300 | |||
| Insulating Boots | Kabeldon | SOC 630 | 50 to 300 | Completed by a kit for three core-pole cable | |
| Simplified Disconnectable | Tyco Electronics | RICS + EPKT | 25 to 300 | ||
| Universal Bushing Boots | Euromold | 15TS-NSS | 50 to 300 | Limited to Us = 20 kV | |
| 24 kV630 A -125 kV impulse | Disconnectable | nkt cables GmbH | AB 12-630 | 25 to 300 (+ATS) | For 3-core cable |
| Simplified Disconnectable | Tyco Electronics | RICS + EPKT | 25 to 300 |
Non-directed field disconnectable connector
Single-core cable, paper impregnated, non-draining type
| Performance | Cable Termination | Manufacturer | Cable Termination Reference | Cross Section sqmm | Comments |
| 7.2 to 17.5 kV630 A-95 kV impulse | Insulating Bushing Boots | ABB Kabeldon | SOC | 25 to 300 | |
| Simplified Disconnectable | Tyco Electronics | RICS – EPKT | 25 to 300 | ||
| Heat Shrink Cable Termination | Tyco Electronics | EPKT+EAKT+RSRB | 95 to 300 | ||
| 24 kV630 A-125 kV impulse | Simplified Disconnectable | Tyco Electronics | RICS – EPKT | 25 to 300 |
Non-directed field disconnectable connector
Three-core cable, paper impregnated, non-draining type
| Performance | Cable Termination | Manufacturer | Cable Termination Reference | Cross Section sqmm | Comments |
| 7.2 to 17.5 kV630 A-95 kV impulse | Insulating Boots | ABB Kabeldon | SOC 630 | 25 to 300 | |
| Simplified Disconnectable | Tyco Electronics | RICS – EPKT | 25 to 300 | ||
| Heat Shrinkable Termination | Tyco Electronics | EPKT+EAKT+RSRB | 16 to 300 | ||
| 24 kV630 A-125 kV impulse | Simplified Disconnectable | Tyco Electronics | RICS – EPKT | 25 to 300 |
Disconnectable Connector Single-core Dry Cable &
MV Medium Voltage Lightning Arrestor
| Performance | Cable Connection | Manufacturer | Cable Termination Reference | Cross Section sqmm | Comments |
| 7.2 to 17.5 kV630 A-95 kV impulse | Disconnectable | nkt cables GmbH | AB 12-630 + ASA12(5 or 10 kA) | 25 to 300 | Non-directed field |
| CB 24-630 + CSA 24(5 or 10 kA) | 25 to 300 | Directed field | |||
| 24 kV630 A-125 kV impulse | Disconnectable | nkt cables GmbH | AB 12-630 + ASA12(5 or 10 kA) | 25 to 300 | Non-directed field |
| CB 24-630 + CSA 24(5 or 10 kA) | 25 to 300 | Directed field | |||
| 7.2 to 17.5 kV630 A-95 kV impulse | Disconnectable | Tyco Electronics | RICS+EPKTRDA 12 or 18 | 25 to 300 | |
| Elastimold | Euromold | K400TB + K400RTPA+ K156SA | 35 to 300 | Cable box enlarged | ||
| 24 kV630 A-125 kV impulse | Disconnectable | Tyco Electronics | RICS + EPKTRDA 24 | 25 to 300 | |
| Elastimold | Euromold | K440TB + K400RTPA+ K156SA | 35 to 300 | Cable box enlarged | ||
| Tyco Electronics | RSTI-58 + RSTI-CC-58SAxx05 | 25 to 300 | Directed field 5 kA arrestor | ||
| Tyco Electronics | RSTI-58 + RSTI-CC-66SAxx10M16 | 25 to 300 | Directed field 10 kA arrestor |
See How Thorne & Derrick & Nexans Euromold can support your MV Bushings & Connectors requirements
Thorne & Derrick International
Since 1985 Thorne & Derrick based in the UK have been specialist distributors of LV, MV & HV Cable Installation, Jointing, Substation, Arc Flash Clothing & Electrical Safety Equipment – customers include UK and worldwide contractors, specifiers, traders and end-users involved in medium and high voltage cable installations, cable jointing, substation, overhead line and electrical construction.
We are specialist stockists and distributors of 11kV-33kV Cable Joints, Terminations & Connectors from manufacturers including 3M, Pfisterer, Prysmian and Nexans Euromold in a selection of cable jointing technologies including push-on, heat shrink and cold shrink joints and cold shrink terminations.
MV HV | Medium & High Voltage Power Products, Tools, Cables & Electrical Equipment
