1. EWT TRANSFORMER
SDN BHD
SALES, AFTER
SALES &
SERVICE
3299, Jln Permata 2,
Arab Malaysian Industril Park,
71800 Nilai,
Negeri Sembilan
www.ewt.com.my

2. 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.

3. EWT PROUD HISTORY - Summary
Date
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 2010
Changed its name to EWT Transformer Sdn Bhd,to reflect EWT as a
brand name
25th June 2010
EWT awarded Certification ISO 14001 : 2004

4. OUR PRODUCT OVERVIEW

OIL IMMERSED TRANSFORMER

5. OUR PRODUCT OVERVIEW – cont.
DISTRIBUTION TRANSFORMER (MODEL
EFG3L / EFG3N)
Type
Oil 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
Temp. rise oil /
winding
IEC 62271-202 (TNB
Approved Type)
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.

6. OUR PRODUCT OVERVIEW – cont.

COMPACT SUBSTATION UNIT

7. OUR PRODUCT OVERVIEW – cont.
DISTRIBUTION
TRANSFORMER (MODEL
EFG3L)
Model
:
Rated Power
:
EPS Series (TNB
Approved Type)
500 to 1000kVA

Among the advantages of
the Pre-Fabricated
Compact Substation Unit :

Primary Voltage
:11kV
Secondary
Voltage
:0.433kV
Standards Index :IEC 62271-202
Protection
:Internal Arc
Tested at
18.4kA/1 second.
:IP 35

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.

8. OUR PRODUCT OVERVIEW – cont.

EARTHING / AUXILIARY TX

9. 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 zigzag (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 earthing
Transformer’s system
ranges from 11kV to 33kV.
Standard accessories and
fittings are as follows:
i.
ii.
iii.
iv.
v.
vi.
vii.
viii.
ix.
Conservator
Silica Gel
Breather Bucholz Relay
Oil Temperature
Indicator
Uninhibited Oil
LV (415kV) Switchfuse
Pressure Relief Device
Drain Valve
Gate Valve

10. TRANSFORMER
LIFE
MANAGEMENT

11. 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, insta
llation 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.

12. TRANSFORMER LIFE MANAGEMENT
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.

13. 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.

14. 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.

15. 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.

16. 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

17. 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

18. WHAT EWT HAVE TO OFFER?

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

19. WHAT EWT HAVE TO OFFER?
3. Tx Overhaul (Major work – at factory)




Tank change
Oil Change
Failed winding change
Refurbishment of the transformer

20. 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)

21. THE END
THANK YOU FOR YOUR TIME