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

Published 09 Apr 2019

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 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 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

➡ 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 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 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

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.