SALES, AFTER SALES & SERVICE3299, Jln Permata 2, Arab Malaysian Industril Park,71800 Nilai,Negeri Sembilan

www.ewt.com.my

EWT TRANSFORMER

SDN BHD

BACKGROUND – COMPANY INTRODUCTION

Established in early 90’s by a well known transformer manufacturer, Wilson Transformer and local company, Teras Daya Konsortium Sdn Bhd.

With 20 staff in our early days, the company had grow to about 150 employee currently.

We are now ranked at no 2 as local transformer manufacturer in Malaysia, behind the TNB’s owned manufacturer.

EWT PROUD HISTORY - SummaryDate Significant Events

14th July 1993 EWT formed a joint venture agreement with WTC

26th August 1993 Incorporated as a manufacturer of Transformer and Compact Substation.

18th November 1994

Received the 1st contract from TNB worth RM17 million – Contract TNB 903/94.

19th December 1995

Official opening ceremony of EWT by Deputy Minister of Finance.

2nd January 1997 Received 1st contract for Earthing Transformer from TNB – Contract TNB 1366/1996.

5th June 1997 Received 1st contract for Compact Substation from TNB – Contract TNB 530/1997.

3rd December 1997 EWT awarded an ISO 9001 : 1994.

9th November 2004 Changed its name to Ranhill Wilson Transformer Sdn Bhd when it became part of the Ranhill Group of Companies.

11th May 2007 EWT awarded certification OHSAS 18001 : 1999.

20th August 2007 Changed its name back to EPE Wilson Transformer Sdn Bhd when it became parts of the TDK Group of Companies.

3rd May 2010Changed its name to EWT Transformer Sdn Bhd,to reflect EWT as a brand name

25th June 2010 EWT awarded Certification ISO 14001 : 2004

OUR PRODUCT OVERVIEW

OIL IMMERSED TRANSFORMER

DISTRIBUTION TRANSFORMER (MODEL EFG3L / EFG3N)

TypeOil Immersed Hermetically Sealed (ONAN)

Rated Power 100 to 5000kVA

Primary Voltage Up to 36kV AC

Secondary Voltage Up to 12kV AC

Primary Tapings ±2.5%, ±5.0%

Standards IEC 62271-202 (TNB Approved Type)

Temp. rise oil / winding

60 Deg. C / 65 Dec. C

Features include:- Standard and low load loss models –

EFG3L & EFG3N Extensive standard and optional

fittings A robust internal steel clamping

structure Low frequency, vacuum drying to

guarantee internal dryness Oil filling of all transformers under

vacuum to remove all air and ensure complete oil impregnation of insulation

A high quality external paint system of polyester powder over a under coat primer.  The system combines high corrosion resistance with a durable tough top coat.

A hermetically sealed flexible tank design to prevent contact between air and oil

A short circuit proof design with copper and aluminium windings.

OUR PRODUCT OVERVIEW – cont.

Dist Tx Catalog

OUR PRODUCT OVERVIEW – cont. COMPACT SUBSTATION UNIT

OUR PRODUCT OVERVIEW – cont.

DISTRIBUTION TRANSFORMER (MODEL EFG3L)Model :EPS Series (TNB

Approved Type)

Rated Power :500 to 1000kVA

Primary Voltage :11kV

Secondary Voltage

:0.433kV

Standards Index Protection

:IEC 62271-202:Internal Arc Tested at 18.4kA/1 second.:IP 35

Among the advantages of the Pre-Fabricated Compact Substation Unit :- Easy access to the RMU and

LV Switchgear for operation Fast installation at

transformers HV and RMU with separable plug in type connector.

Assurance of maximum safety in public area.

Catalog for Pre Fab CSU

EARTHING / AUXILIARY TX

OUR PRODUCT OVERVIEW – cont.OUR PRODUCT OVERVIEW – cont.

In areas where earth point is not available, a neutral point is created using an earthing transformer. Earthing transformer, having the zig-zag (interstar) winding is used to achieve the required zero phase impendence stage which provides the possibility of neutral earthing condition. In addition an auxiliary windings can also be provided to meet the requirement of an auxiliary power supply.

Earthing transformers are usually oil immersed and may be installed outdoor. As for connection, the earthing can be connected directly, through an arc-suppression reactor or through a neutral earthing reactor or resistor. In cases where a separate reactor is connected between the transformer neutral and earth, the reactor and the transformer can be incorporated into the same tank.

OUR PRODUCT OVERVIEW – cont.

Our earthing Transformer’s system ranges from 11kV to 33kV. Standard accessories and fittings are as follows:i. Conservatorii. Silica Gel iii. Breather Bucholz Relay iv. Oil Temperature

Indicator v. Uninhibited Oil vi. LV (415kV) Switchfusevii. Pressure Relief Deviceviii. Drain Valve ix. Gate Valve

Catalog For Earthing n Auxiliary TX

TRANSFORMER LIFE MANAGEMENT

TRANSFORMER LIFE MANAGEMENT

Critical oil-filled electrical equipment especially transformers, are critical elements of an electrical power system. Their reliable and continued performance is the key to profitable generation and transmission. Their costs of acquisition, replacement, transportation, installation and repairs are among the highest on the system. Their failures, and resulting unavailability, create losses of revenues. These failures, when catastrophic, will generate substantial costs in terms of peripheral equipment destruction, environmental damages and unplanned emergency utilization of human resources and alternative power sources.

WHAT ARE THE COMMON FAILURES / DEFECTS? Oil leak from covers, bushings, gaskets,

corrugated fins and welding. Electricals failures such shorts circuits, over

heat and out of ratio’s output Mechanical failures such as the tap changer

malfunction

HOW THIS IMPACT? All the failures can lead to transformers stop

from doing his job.

TRANSFORMER LIFE MANAGEMENT

Major oil leak can caused insufficient oil inside transformer tanks Less oil means the tx will loss their cooling agents

for the most critical parts, the core and windings. Since the tx had the high electrical activities, the windings

will always in hot conditions and the oil needed as the cooling agents

Less oil will reduce the electrical clearance between the winding and between electrical parts and tanks Tx is designed in such compact to cater the needs of high

voltage activities. Oil also, in this needs will act as parts of insulation material in providing additional virtual clearance needed.

TRANSFORMER LIFE MANAGEMENT

Dirty, high gas content and low breakdown voltage for tx oil. Low voltage breakdown will cause the oil lost its

function as parts of insulation agent Dirty, high particles content can caused electrical

shorting between winding Some unstable gas such hydrogen, CO and O2

can react to each other and create internal moisture.

Attendance of acetylene gas can show us that the winding had gone thru high electrical works that caused high winding temperature. High numbers of acetylene shows either the insulation paper had deteriorate , high temperature activities or some short circuits had happened.

TRANSFORMER LIFE MANAGEMENT

BESIDES THE VISUAL CHECK, WHAT ELSE CAN WE DO TO DETERMINE THE Tx CONDITION?

OUR RECOMMENDATIONS ARE: Functional test and/or service of the tap changer On site electrical test to confirms the winding, the electrical

clearance is in good condition Recommended test:

Ratio Insulation Resistance Winding Resistance

The Tx “Blood Test” Recommended Blood Test (minimum):

Dielectric Breakdown Moisture Content Dissolved gas analysis

Note: All above are recommended as yearly maintenance checked.

TRANSFORMER LIFE MANAGEMENT

Change the oil gaskets at once in 5 years frequency Oil filtration works

Depending on the oil test a.k.a “blood test” results

TRANSFORMER LIFE MANAGEMENT

WHAT EWT HAVE TO OFFER?

Dedicated team to help you on your transformer. As the OEM manufacturer, we have the

capabilities to do:1. Yearly routine maintenance:

Visual inspection / Functional Bushing condition Oil leaks Rusty tanks Oil level Tap changer operation

Electrical Test Ratio Test Insulation Resistance Winding Resistance

Tx “Blood Test” Oil Dielectric Breakdown Voltage (IEC 60156) Oil Moisture Content (ASTM D1533B) Dissolve Gas Analysis (ASTM D3612) Interfacial Tension – IFT (ASTMD971) Color Number & Visual Exam (ASTM D1524) Acid Number (ASTMD974) Power Factor (IEC 60156)

2. Servicing your transformer (on-site) Gasket Change Spare parts change Oil filtration Transformer paint touch up Tank leak repair

WHAT EWT HAVE TO OFFER?

3. Tx Overhaul (Major work – at factory) Tank change Oil Change Failed winding change Refurbishment of the transformer

WHAT EWT HAVE TO OFFER?

CONTACT US:Ruhi Budiman (Ass. Mgr Service) at:+60132865787 (mobile)+6067994100 (office)

Islahuddin Omar (After Sales & Service Exe.)+60192223414

Mohd Zaini Ahmad Shokri (Deputy GM, Sales, Marketing and After Sales)+60123824341(mobile)+6067994100 (office)

THE ENDTHANK YOU FOR YOUR TIME