132kV 33kV 11kV DNO Substations – A Guide To Cable Sealing By Roxtec

Published 09 Apr 2019

132kV 33kV 11kV DNO Substations

132kV 33kV 11kV DNO Substations

  • uploaded by Chris Dodds - Sales & Marketing Manager Thorne & Derrick International

A Guide To Cable Sealing By Roxtec

Thorne & Derrick are distributors for Roxtec, the leading manufacturer of sealing solutions for cables and pipes, to protect electricity Transmission & Distribution assets including substations against the potential catastrophic effects water, gas and fire.

The following article discusses Roxtec cable transit products for the sealing of HV single core power cables, multicore cables and earthing arrangements into a substation environment either below ground or at a higher level.

The primary consideration of this specification is to prevent water ingress into the controlled switchroom environment, to assist in maintaining conditions within switchgear operational parameters in accordance with manufacturer’s guidelines and IEC62271-1 2007 / BSEN62271- 1 2008.

This specification also provides protection against pollution from dust, smoke, corrosive and/or flammable gases, vapours and salt in accordance with the same, reducing the potential for equipment failure due to partial discharge.

The Roxtec system also provide a means of secure cable retention under normal loads and fault conditions and/or where the exterior of the building is subject to ground settlement post back-filling of the cable trench. Cable transits also provide ingress protection in both normal and flood conditions and can be installed in running water.

Cable Sealing Technical Performance & Product Overview

Roxtec Knock Out Sleeve UG (KOS)

  • Used for formation of 100mm, 150mm and 200mm cable ducts – see casting guidelines for additional information
  • Complete sealing solution comprising of a sleeve with an external puddle flange and integrated sealing plate – keeps building dry during and after construction
  • Cast installation for either new build or retrofit substation applications
  • IP68 tested and certified to 0.3bar constant water pressure and 1bar catastrophic water pressure. Gas tight to 0.3bar
Roxtec Knock Out Sleeve UG (KOS)

Roxtec Knock Out Sleeve UG (KOS)

 

Roxtec Part Number W (mm) Accommodates Seal  Accommodates Extension Conduit/ Duct (mm) Roxtec Article N°
KOS 100/110 UG 180 R 100 UG
RS 100 UG
110 184064
KOS 150/160 UG 230 R 150 UG
RS 150 UG
H3 150 UG
160 184066
KOS 200/200 UG 280 R 200 UG
H3 200 UG
200 184068


Roxtec UG Rubber Seals

  • Tested and certified to IP68 for constant water pressure to 0.3bar (3m head of water normal conditions) and catastrophic pressure to 1bar (10m head of water flood conditions). Gas tight to 0.3bar
  • Certified rodent / vermin ingress protection
  • Cable seals can be installed in running water conditions & retrofit around existing cable installations
  • Fittings manufactured from 316L stainless steel. Minimum clearance of 3mm between rubber and metal fittings to prevent direct contact between the cable and any metal components
  • Minimum seal depth 60mm to aid with cable retention. Preventing loss of seal when; movement occurs on the cable due to ground settlement post backfill, the weight of the cables and the flex during operation
  • Cable retention with a pull force of up to 10,000N and a weight load of up to 1,000kg, depending on size / seal selection

Roxtec RS UG Seal

These cable transits manufactured from Roxylon EPDM rubber with Multi-diameter peelable layers at 1mm increments are designed to seal a single LV MV HV cable between 9-204mm Ø. The unique indicator window allows for a simple check that the Roxtec cable seal has been sufficiently tightened. Fully openable/split system allowing for easier installation / cable positioning.

Roxtec RS UG Seal

Roxtec RS UG Seal

 

Roxtec Part Number Number of Cables For Cable / Pipe Ø (mm) For Aperture Dimension Ø (mm) Roxtec Article N°
RS 100 UG 1 0+39-63 100-105 167236
RS 100 24-53 UG 1 0+24-53 100-105 186250
RS 125 1 0+55-88 125-130 167638
RS 150 UG woc 1 80-113 150-155 167246

 

Roxtec H3 UG Seal

These Roxtec H3 cable transits are manufactured from Roxylon EPDM rubber with Multi-diameter peelable layers at 1mm increments designed for use with HV single core cables between 23-68mm Ø in a trefoil formation. The unique indicator window allows for a simple check that the seal has been sufficiently tightened. Fully openable/split system allowing for easier installation / cable positioning.

Roxtec H3 UG Seal

Roxtec H3 UG Seal

➡ For further reading Roxtec H3 Cable Transit Seals – How To Seal Substation Cables

 

Roxtec Part Number Number of Cables For Cable / Pipe Ø (mm) For Aperture Dimension Ø (mm) Roxtec Article N°
H3 150 UG 3 24-52 150-155 151561
H3 185 UG 3 48-64 185-190 126283
H3 200 UG 3 48-68 200-205 117842

 

Roxtec R UG Seal

Designed for entries with multiple LV / Multicore cables, includings control / comms and aux cables. An openable/split round seal used in conjunction with Roxtec RM UG modules.

Roxtec R UG Seal

Roxtec R UG Seal

 

Roxtec Part Number Module Packing Space (mm) For Cable / Pipe Ø (mm) For Aperture Dimension Ø (mm) Roxtec Article N°
R 100 UG 60 x 60 Refer to Module Packing Space & Multi diameter Sealing Range of RM UG Modules 100-102 158522
R 150 UG 90 x 90 150-152 150071
R 200 UG 120 x 120 200-202 150075


Roxtec RM UG Modules

Roxtec RM UG sealing modules feature Multi diameter, the Roxtec technology with removable layers so that they can easily be adapted to a wide range of cable sizes. The Roxtec RM UG sealing module is developed to be installed in the Roxtec R UG Seal.

Roxtec RM UG Modules

Roxtec RM UG Modules

 

Roxtec Part Number Number of Cables For Cable / Pipe Ø (mm) Module Packing
Space Dims (mm)
Roxtec Article N°
RM 30 UG 1 0+10-23.5 30 x 30 116837
RM 40 UG 1 0+9.5-31 40 x 40 116865
RM 60 UG 1 0+24-52 60 x 60 116869
RM 90 UG 1 0+48-68 90 x 90 174930
RM 20 UG 1 0+4-13 20 x 20 116871
RM 20w40 UG 2 0+2×4-13 20 x 40 116870

 

Earthing Arrangements

Flat earth tapes can be sealed using a Roxtec R Seal (AISI 316L) and a water jet cut module in Roxylon EPDM rubber. Note that the Roxtec UGTM pipe or cable sealing system is not suitable for use with braided / twisted earth rope. Solid circular earth bar can be sealed using the standard Roxtec RM modules.

Earthing Arrangements

Earthing Arrangements

 

Roxtec Part Number Packing Space / Module Dims (mm) Earth Tape / Cable Dims Ø (mm) For Aperture Dimension Ø (mm) Roxtec Article N°
Seals:
R 100 AISI 316L 60 x 60 100-102 R000001001021
R 125 AISI 316L 80 x 80 125-127 R000001251021
R 150 AISI 316L 90 x 90 150-152 R000001501021
R 200 AISI 316L 120 x 120 200-202 R000002001021

 

Earth Tape Modules:
RM 60/SQ40x4 60 x 60 ET Module 40×4 Copper Tape 118418
RM 60/SQ50x6 60 x 60 ET Module 50×6 Copper Tape 118438
RM 60/SQ50x4 60 x 60 ET Module 50×4 Copper Tape 107067
RM 20w60/31×6 20 x 60 ET Module 31×6 Copper Tape 189962
RM 20w60/40×4 20 x 60 ET Module 40×4 Copper Tape 172809
RM Customised Customised Customised Copper Tape Contact Roxtec

 

RM Modules/Cable Packing Space:
RM 30 30 x 30 Module 0+10-23.5 RM00100301000
RM 40 40 x 40 Module 0+21.5-34.5 RM00100401000
RM 60 60 x 60 Module 0+28-54 RM00100601000
RM 20 20 x 20 Module 0+4-14.5 RM00100201000
RM 20w40 20 x 40 Module 0+2×3.5-16.5 RM00120401000
RM40 (10-32) 40 x 40 Module 0+9.5-32.5 RM00140101000

 

IEC62271-1 2007

High-Voltage Switchgear& Controlgear – Part 1: Common Specifications

Note this standard is now withdrawn and superseded by IEC 62271-1:2017 (High-voltage Switchgear & Controlgear – Part 1: Common Specifications for Alternating Current Switchgear & Controlgear). This part of IEC 62271 applies to a.c. switchgear and controlgear designed for indoor and outdoor installation and for operation at service frequencies up to and including 60 Hz on systems having voltages above 1000 V.

This standard applies to all high-voltage switchgear and controlgear except as otherwise specified in the relevant IEC standards for the particular type of switchgear and controlgear. This standard cancels and replaces IEC 60694 published in 1996.

Bespoke Solutions

Contact T&D and together with Roxtec we can discuss design services for seals and customised sealing solutions which fall outside the standard range.

Manufacturing / Quality Approvals
  • ISO 9001:2008 ISO 14001:2004 certified
  • Seals tested and certified to IP68
  • Certified rodent / vermin ingress protection
  • Complies with recommendations outlined in EA Technology white paper – Humidity Effects in Substations – 2013

Thorne & Derrick Specialist Electrical Distributor

Established since 1985, T&D distribute the most extensive range of LV, MV & HV Cable Jointing, Terminating, Pulling & Installation Equipment – contact us today for a competitive quotation.

Key Products : MV Joints & Terminations, Cable Cleats, Duct Seals, Cable Transits, Underground Cable Protection, Jointing Tools, Feeder Pillars, Cable Duct, Earthing & Lightning Protection, Electrical Safety, Cable Glands, Arc Flash Clothing Protection & Fusegear.

Distributors for : 3M, Pfisterer CONNEX, Nexans Euromold, Elastimold, Catu, Roxtec, Emtelle, Centriforce, Lucy Zodion, Alroc, Hivotec, Cembre, Prysmian, Ellis Patents, ABB & Furse.

Nexans Euromold Pfisterer

T&D Providers Of Jointer Training Courses By Pfisterer CONNEX & Nexans Euromold

Further Reading