Platform Touch Voltage ProtectionMembrane System (PTVPMS)

Introduction

Tokai Platform Touch Voltage Protection Membrane System (PTVPMS) is a customized solution installed at MRT Platforms to safeguard passengers on the platform from possible electrical shocks caused by touch and step voltages.

These electrical shocks can occur during:• Boarding / Alighting• Physical contact with the train• Physical contact with Platform Screen Doors (PSDs).

Potential Hazards

Potential hazards such as electrical shocks to passengers due to the different voltage potentials which can occur around the platform edge especially between the platform screen door and train or train depot workshop area. For our MRT system, the platform screen doors that are installed at the underground and elevated stations are in close

proximity to the train at the station platform edge, and this is the area that poses the highest risk to touch potential and its associated hazards.

Therefore to mitigate this risk, a protection zone in the form of an insulation system is required, and in doing so we are able to protect passengers on the platform from accidental contact with high voltage that with sufficient energy may result in severe injury or death.

System BenefitsOur insulation membrane solution is in accordance to the International Standards of VDE 0115 and EN 50122-1Bonded type Membrane with hot-liquid applied to the required thickness (2.5mm – 3mm) both horizontal and vertical applicationNo adhesive used, hence porous or air-void between membrane and concrete is avoided.Earth resistance compliance test in accordance to the BS 7430 and MS IEC 62305:2006Proven reliability and durability for MRT Projects

Platform Touch Voltage ProtectionMembrane System exclusively from TOKAI!A Protection Solution In Accordance to the International Standards of VDE 0115 and EN 50122-1.

pg2

The Protection ZoneThe protection zone coverage of the membrane shall be 1.8 to 2.4m away from the Passengers Screen Door (PSD) and to the height of 2.5m above Finished Floor Level (FFL).

Insulation SealantA High Resistivity Sealant shall be used to seal off all gaps between the floor and the Insulation Membrane which have the following characteristics in accordance to ASTM D257:2014 Standard:• Volume Resistivity : 1 x 1014 ohm – cm• Elongation Break : 200%

Membrane TypeBonded type Membrane with hot-liquid applied to the required thickness of 2.5mm – 3mm for both horizontal and vertical applications.

Membrane SpecificationsSubjected to Volume Resistivity Test ofASTM D257:2014 Standard andresults states that the VolumeResistivity is tested to exceed5x1014 ohm-cm.

1.8 to 2.4m

2.5

mimage for illustration purposes only

Testing of Membrane

Testing of the membrane shall be carried out with the Digital Insulation Tester with a testing voltage of 250/500V DC and the passing criteria shall be as follows:

On Membrane Surface- 500,000 ohm in dry/damp conditionOn Platform Surface- 35,000 ohm in dry condition- 10,000 ohm in damp condition

Tokai PTVPMSSite Installation

Tokai PTVPMS with PSD doors installed

pg3

Platform Touch Voltage Protection Membrane System:Process

HOT APPLIED RUBBERIZED ASPHALT SYSTEM

The system uses hot asphalt as a medium to adhere the asphalt touch voltage membrane onto the substrate thereby generating a fully bonded system. The hot asphalt application method promotes a fully bonded system that eliminates water admitting gaps. Regardless of the quality of the membrane used, cold application method will always leave some gaps that may possibly admit water as illustrated in the adjacent diagram.

TOKAI MEMBRANE

The membrane incorporates a non-woven mat and synthetic fiber mesh as reinforcement impregnated with a high resistivity membrane on both sides with styrene butadiene modified asphalt. This high resistivity membrane provides an elastic body with excellent tensile strength on account of its high modulus configuration. The latter enhances the ability of the high resistivity membrane to follow the movement of the substrate thereby reducing the possibility of rupture to the membrane caused by substrate movement.

Hot applied system traffic type Demerits of cold application method

Sectional view

Water path (passage)

BEHAVIOUR OF HIGH-MODULUS MEMBRANE

BEHAVIOUR OF LOW-MODULUS MEMBRANE

Stress distribution. Shifting and floating occurs Stress concentration

When the crackwidth is extended

When the crackwidth is reduced

local bending applyingcompression

pg4

Platform Touch Voltage Protection Membrane System:Specifications

PERFORMED SHEET ELECTRICAL INSULATION MEMBRANE

DESCRIPTION. The high resistivity membrane is a styrene butadiene rubber modified asphalt performed sheet electrical insulation membrane which incorporated a polyvinyl and polyester synthetic fabric.

FIXES. The high resistivity membrane is designed to provide complete electrical insulation protection with extensive applications for many rail projects.

FEATURES•

•

•

Excellent tensile strength and dimensional stability.A seamless built-up electrical insulation protectionComes in an easy-to-handle rolls of prefabricated membrane.

Anti-static powder

High resistivity membrane compound

Non-woven fabric

Synthetic fiber mesh

High resistivity membrane compound

Anti-static powder

TECHNICAL DATA

ITEM OF TEST PRODUCTMass of one roll (kg)

Length of one roll (m)

Width (mm)

Unit mass of product (g/m2)

Unit mass of web (g/m2)

Unit mass of rubberized asphalt (g/m2)

Tensile strength

(N.10mm)(kgf/10mm)

Elongation at

MAXIMUM LOAD (%)

3% Tensile strength

(N/10mm)(kgf/10mm)

Tensile product

Referring to 10mm of width

(N.%/10mm)(kgf.%/10mm)

TEST RESULT31.0

21.04

1010

1450

316

633

142.7

103.5

7.5

6.0

123.5

91.5

1070

620

OUR REQUIREMENT30.0 min

21.0 min

1000 min

1400 min

260 min

600 min

80 (8.2) min

80 (8.2) min

5.0 min

5.0 min

40 (4.1) min

40 (4.1) min

400 (41.00) min

400 (41.00) min)

Longitudinal direction

Cross direction

Longitudinal direction

Cross direction

Longitudinal direction

Cross direction

Longitudinal direction

Cross direction

pg5

SURFACE PREPARATION

Structural slab shall be cast with a monolithic power-float or steel-trowel smooth to achieve rigid and even concrete finishes. New concrete structure should be cured for more than 14 days old prior to commencement of touch voltage membrane works. All pipe penetrations shall be installed with flanges and firmly cast in.

PRIMING

The substrate is first primed with an asphaltic adhesive primer at the minimum of 0.3 kg per square metre. Allow primer to cure so that all inherent solvents in the primer have evaporated.

Installation

During the installation process, each roll of the high resistivity membrane should align with the adjacent roll. The membrane should then be installed simultaneously with hot asphalt by unrolling the electrical insulation membrane. Subsequent shifting of the roll should be avoided after pouring of hot asphalt compound has begun. All laps should be 100 mm which can be achieved by lines already drawn on every roll of the high resistivity membrane during the manufacturing process. Joints should be lapped and should be staggered.

Platform Touch Voltage Protection Membrane System:Installation

pg6

Project Reference Sites from MRT Line 1

PTVM System For All 7 MRT Underground Station.MRT Package S1 (3 stations)MRT Package S2 (3 stations)MRT Package S4 (2 stations)MRT Package S5 (4 stations)MRT Package S6 (3 stations)MRT Package S7 (2 stations)MRT Package S8 (3 stations)

••••••••

pg7

An Award Winning Companywith a solid track record and portfolioAs the nation’s leading lightning protection and security solutions provider, TOKAI is proud to provide quality products and services that protects your homes, buildings, lives and businesses. We are the only ISO certified lightning and security solutions provider in the nation. Our products are registered with Jabatan Kerja Raya and SIRIM. Tokai’s Earthing & Lightning Protection Systems are in full compliance to IEC 62305 & BS EN 62305:2006 and are tested in accordance to *BS 50164-1 and 50164-2

Established in 1993, Tokai has grown from strength to strength, winning numerous projects that have become landmarks in the nation. Tokai is the dominant force in the field of lightning & surge protection as well as engineering security solutions.

Tokai Group of Companies is a 100% Malaysian owned entity. Our engineers and technicians are highly-trained with vast project experience to ensure total customer satisfaction. Tokai's name is synonymous with quality and excellence.

Please visit our website for more details.

* tested to 100KA of lightning currents

TOKAI’S TOTAL LIGHTNING & EARTHING SOLUTIONSFully complies to IEC 62305 & BS EN 62305-2006, tested in accordance to *BS 50164-1 and 50164-2

*100KA of Lightning Currents

Tokai ExothermicWelding

Tokai Earthing & LightningProtection System

Tokai Electronic SurgeProtection System

Tokai Marconite

Stray Current Control &Monitoring System

Touch Voltage Protection System

-

+

Sub-station

Ground

Soil current return path

Stray current leavespipeline

Rail current return path

Stray current enterspipeline

Tokai Engineering (M) Sdn BhdLot 14, Jalan Astaka U8/82,Seksyen U8, Bukit Jelutong,40150 Shah Alam, Selangor, Malaysia.Tel: +603-7845 2323 | Fax: +603-7845 5420Email: sales@tokai.com.my

(259755-W)

4152

ec

european

group

certification

I S O 9 0 0 1REGISTERED FIRM QS 081220007 CB 07

ec

european

group

certification

I S O 9 0 0 1REGISTERED FIRM

TESTED AND CERTIFIED COMPLIANT TOMS IEC 62305, BS EN 62305 : 2006 & PAS 68

v01-0712016