EMSD-Final Presentation_25.01.2011

Promoting Electrical Safety in the

Transmission and Distribution of

Electricity in Singapore

Presented by: Er Joseph Michael

Sr Principal Engineer

(Electricity Regulation)

Date : Tuesday 25th Jan 2011

Time : 10.50am - 11.10am

Venue : Kowloon Shangri-La Hotel

Hong Kong

SP PowerAssets Ltd

(SPPA)

• Owner of

Transmission &

Distribution

Network

SP PowerGrid Ltd

(SPPG)

• Operator of the

T&D Network

Energy Market

Authority (EMA)

• Regulator of the

Electricity & Gas

Industries in

Singapore

THREE KEY PLAYERS

Ministry of Trade

and Industry

THREE KEY PLAYERS

SPPA

SPPG

ROLES OF SPPA AND SPPG IN THE ELECTRICITY INDUSTRY

• Develop and maintain a reliable & efficient T&D network

• Facilitate competition in the generation and sale of electricity

• Provide non-discriminatory access to its T&D network

SPPA- SPPG signed Transmission System

Management Services Agreement (08 Oct

2003)

Transmission Agent Licence - EMA/TAL/001

(On 27 Jul 2006)

Transmission Licence - EMA/TE/002

valid for 25 years wef 03 Nov 2003

ASSETS OWNED BY SPPA

Asset Value is S$7.3 Billion

Note : Figures are valid as at 31 Mar 2010

400 kV (4)

230kV (17)

66 kV (94)

22kV & 6.6kV (9964)

Low Voltage 400/230 V

SINGAPORE’S TRANSMISSION SYSTEM

Low Voltage Consumers

SPPG

EMA

PROCCESSES TO ENHANCE ELECTRICAL SAFETY

• Staff Training

• Developing a Culture of Continuous Improvement

• Staff Training

• Maintenance of Equipment

• Contractor Safety Management System

• Developing a Culture of Continuous Improvement

CONTRACTOR SAFETY MANAGEMENT SYSTEM

CONTRACTOR SAFETY MANAGEMENT SYSTEM

SPPG

EMA

REPORTING AND INVESTIGATION OF AN ELECTRICAL

INCIDENT IN THE T&D NETWORK

Investigation by Electricity Regulation Branch :

• Site Visit

• Preliminary Investigation

• Investigation Report

Report to EMA by the quickest means possible:

• Telephone

• Incident Report within 24 hours

Section 94 of the Electricity Act -

Serious Accidents to be reported and investigated

INVESTIGATION OF ELECTRICAL INCIDENTS

IS UNDERTAKEN BY EMA

ELECTRICAL INCIDENTS IN THE T&D NETWORK

CASE STUDY NO. 1- 150 CANTONMENT ROAD

FACTS OF ELECTRICAL INCIDENT

• Date : Mon 15 Oct 2007

• Location : Overground Box (OGB)

• Deceased: A 35-year old male

FINDING

The deceased was electrocuted while attempting

to steal cables.

CASE STUDY NO. 1- 150 CANTONMENT ROAD

The ‘LIVE’ part of the

Blue phase link metal

CASE STUDY NO. 1- 150 CANTONMENT ROAD

CASE STUDY NO. 1- 150 CANTONMENT ROAD

OGB 23087C2060 OGB 23084C6445

OGB 23087C2871F

Building A

Building B

Mobile Generator

Lesson Learnt : Remove decommissioned

equipment from site and reduce the risk of electrical

shock

CASE STUDY NO. 2 – SOMERSET 66KV SUBSTATION

FACTS OF ELECTRICAL INCIDENT

• Date : Wed 02 Jul 2008

• Location : Somerset 66kV substation switchgear bay

• Injured: A 34-year old male who suffered second

degree burns on the right side of the body, right arm

and right leg.

FINDING

The lack of clear instructions from the maintenance

team leader and incorrect marking on site misled a

worker into working on Isolator 6-289 instead of

Isolator 6-189 resulting in a flashover.

CASE STUDY NO. 2 – SOMERSET 66KV SUBSTATION

Damaged Isolator 6-189

Local Control Box for Isolator 6-189

6-189 6-289

CASE STUDY NO. 2 – SOMERSET 66KV SUBSTATION

LESSONS LEARNT

• The Authorised Person from SPPG failed to follow

established practice as specified in SPPG’s document

“Rules for the Control and Safe Operation of High and Low

Voltage Apparatus” – 4th Edition June 2006

• A clear message must be sent to all SPPG Operational

Personnel that safety is of paramount importance and that

deviation from best practices will not be tolerated.

• SPPG was fined S$850K under our Financial Penalty

Scheme for the outage caused.

• Authorised Officer was also penalised.

Joint Bay A

Joint Bay B

Mandai Rd

22/6.6 kV S/S

Mandai Rifle

Range RMU

S/S

Telecoms Mobile

Radio Base Station

RMU S/S To Mandai

Road

To Singapore

Zoological Gdns

S’pore Zoological

Gdn 22/6.6 kV S/S

Damaged Mandai Rd 22/6.6 kV

S/S to Telecoms Mobile Radio

Base Stn RMU S/S New Cable

S’pore Zoological Gdn 6.6 kV S/S to Mandai Rifle

Range RMU S/S

2nd Cut

1st

Cut Joint

CASE STUDY NO. 3- MANDAI LAKE ROAD ROAD

New

Cable

Live

Cable

Faulty

Cable

8cm 8cm 8cm

1.5 metres below ground level

Power Saw

Cross-Section of the 6.6kV Cables

in Joint Bay A

CASE STUDY NO. 3 - MANDAI LAKE ROAD

CASE STUDY NO. 3 - MANDAI LAKE ROAD

CASE STUDY NO. 3 - MANDAI LAKE ROAD

CASE STUDY NO. 3 - MANDAI LAKE ROAD

LESSONS LEARNT

• When carrying out cable repair work, there is a

need for proper supervision by the Authorised

Person over the entire cable cutting process.

• Need to develop and prescribe the types of

support for different types of cables and different

types of cutting tools.

A NEW ELECTRICAL HAZARD

A NEW ELECTRICAL HAZARD

THANK YOU FOR YOUR KIND

ATTENTION