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Haziqah Raihah Binti Hassan
EP089926
Lecturer: Dr Muhamad bin Mansur
Supervisor: En. Ahmad Kamil Bin Mohd Yusof
 Safety briefing by Mr Nagaraju
 Must SEE, THINK and DO IT RIGHT.
 Must wear proper personal protective equipment (PPE)
 Do not smoke at prohibited areas
 Do not wear metal objects, turn off any power supply and wear appropriate
clothes during inspection works.
 Consists of 3 types which are generator transformer, unit transformer and station transformer.
 Types of alarm for transformers: winding temp, oil temp, Buchholz, Oil Level, Pressure relief, oil flow,
cooler failure, pump failure etc.
16/3/2015
PIC : En Shaffi (Foreman) and En Zulfitri (Technician)
Plant: Generator Transformer Unit 4, CECR
Job: Alarm Test
20/3/2015
PIC: En Nasran (Assistant Foreman)
Plant: Generator Transformer and Unit Transformer (Unit 4)
Job: Stability Test
Aim : To verify and confirm the current transformer (CT) polarity and wiring connection
is correct before and after refurbishment of Generator Protection Relay.
15/4/2015
PIC: MELCO’s supervisor with Mitsubishi Engineer
Plant: Generator Transformer Unit 3
Job: On Load Tap Changer (OLTC) Inspection.
Tap Changing
- Change the number of coils
- Reduce / avoid arcing
OLTC Inspection
Periodical inspection points of
Mitsubishi Type MRT On Load Tap Changer (OLTC)
Diverter switch
Tap Selector
- Spur gear
- Insulation driving shaft
- Insulation supporting shaft
- Sheild ring
- Quick motion mechanism
- Moving contact unit
- Stationary contact
- Current-limiting resistor- Upper mechanism
- Contact assembly
Types of failure
of the major
components
Methods to
overcome the
failure
Generator Transformer
28/4/2015
PIC: En Nasran with Siemens supervisor
Plant: Generator Transformer Unit 3
Job: Bushing Inspection
- Change new bushing from Trench by Germany
23/3/2015
PIC: En Zulfitri (Technician)
Plant: Generator Hydrogen Cooling System Unit 4
Job: Hydrogen Drier Purge with Nitrogen.
NOTES:
H2 to replace CO2 takes 3 hours.
H2 to operate pressure after replacing CO2
completely 100% takes 1 hour.
24/3/2015
PIC: En Nasran (Assistant Foreman) and En Zulfitri (Technician)
Plant: Generator Transformer and Unit Transformer Unit 4
Job: Insulation Resistance (IR) Test
IPB is turned off manually Voltage transformer
(R,Y,B) panels are
rack out
IR and PI test
(1kV/1-10min) conducted
Short circuit and grounding
switch
- Disconnecting neutral
grounding tx
24/4/2015
PIC: Contractor
Plant: Generator and Exciter Unit 3
Job: Bearing Inspection of Exciter
PIC: En Azhari (Technician)
Plant: Battery 220 VDC Unit 4
Job: Testing change over relay
- Learn the drawing
- Learn the battery information
PIC: En Syazali (Technician)
Plant: Battery bank 220 VDC (Unit 3 & Unit 4)
Job: Monthly reading on voltage and temperature.
NOTES:
The battery’s voltage must  1.8V
PIC: Menang Company (Contractor)
Plant: Battery Room 48 VDC
Job: Boost Charge and Battery Discharge Test
OVERVIEW:
-Boost charge the battery bank
1 day before the test conducted
by increasing the charger output
to 62.7V (1.65V per cell)
- Switch off the battery MCCB
- Measure battery voltage,
spesific gravity and electrolyte
temperature of each cell
- Battery discharge test
- Final checking

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INDUSTRIAL TRAINING

  • 1. Haziqah Raihah Binti Hassan EP089926 Lecturer: Dr Muhamad bin Mansur Supervisor: En. Ahmad Kamil Bin Mohd Yusof
  • 2.  Safety briefing by Mr Nagaraju  Must SEE, THINK and DO IT RIGHT.  Must wear proper personal protective equipment (PPE)  Do not smoke at prohibited areas  Do not wear metal objects, turn off any power supply and wear appropriate clothes during inspection works.
  • 3.
  • 4.  Consists of 3 types which are generator transformer, unit transformer and station transformer.  Types of alarm for transformers: winding temp, oil temp, Buchholz, Oil Level, Pressure relief, oil flow, cooler failure, pump failure etc. 16/3/2015 PIC : En Shaffi (Foreman) and En Zulfitri (Technician) Plant: Generator Transformer Unit 4, CECR Job: Alarm Test
  • 5. 20/3/2015 PIC: En Nasran (Assistant Foreman) Plant: Generator Transformer and Unit Transformer (Unit 4) Job: Stability Test Aim : To verify and confirm the current transformer (CT) polarity and wiring connection is correct before and after refurbishment of Generator Protection Relay.
  • 6. 15/4/2015 PIC: MELCO’s supervisor with Mitsubishi Engineer Plant: Generator Transformer Unit 3 Job: On Load Tap Changer (OLTC) Inspection. Tap Changing - Change the number of coils - Reduce / avoid arcing
  • 8. Periodical inspection points of Mitsubishi Type MRT On Load Tap Changer (OLTC) Diverter switch Tap Selector - Spur gear - Insulation driving shaft - Insulation supporting shaft - Sheild ring - Quick motion mechanism - Moving contact unit - Stationary contact - Current-limiting resistor- Upper mechanism - Contact assembly
  • 9. Types of failure of the major components Methods to overcome the failure Generator Transformer
  • 10. 28/4/2015 PIC: En Nasran with Siemens supervisor Plant: Generator Transformer Unit 3 Job: Bushing Inspection - Change new bushing from Trench by Germany
  • 11. 23/3/2015 PIC: En Zulfitri (Technician) Plant: Generator Hydrogen Cooling System Unit 4 Job: Hydrogen Drier Purge with Nitrogen. NOTES: H2 to replace CO2 takes 3 hours. H2 to operate pressure after replacing CO2 completely 100% takes 1 hour.
  • 12. 24/3/2015 PIC: En Nasran (Assistant Foreman) and En Zulfitri (Technician) Plant: Generator Transformer and Unit Transformer Unit 4 Job: Insulation Resistance (IR) Test IPB is turned off manually Voltage transformer (R,Y,B) panels are rack out IR and PI test (1kV/1-10min) conducted Short circuit and grounding switch - Disconnecting neutral grounding tx
  • 13. 24/4/2015 PIC: Contractor Plant: Generator and Exciter Unit 3 Job: Bearing Inspection of Exciter
  • 14. PIC: En Azhari (Technician) Plant: Battery 220 VDC Unit 4 Job: Testing change over relay - Learn the drawing - Learn the battery information
  • 15. PIC: En Syazali (Technician) Plant: Battery bank 220 VDC (Unit 3 & Unit 4) Job: Monthly reading on voltage and temperature. NOTES: The battery’s voltage must  1.8V
  • 16. PIC: Menang Company (Contractor) Plant: Battery Room 48 VDC Job: Boost Charge and Battery Discharge Test OVERVIEW: -Boost charge the battery bank 1 day before the test conducted by increasing the charger output to 62.7V (1.65V per cell) - Switch off the battery MCCB - Measure battery voltage, spesific gravity and electrolyte temperature of each cell - Battery discharge test - Final checking