This is a brief presentation for Hospitality, Manufacturing and many industries about occupation health and safety. This presentation targets major aspect in Medium Voltage Substation Health, Safety and Maintenance parameters.

1. POWER LOGIC ENGINEERS (PRIVATE) LIMITED
SAFETY AND SCHEDULE INSPECTIONS FOR MV SUBSTATION
AUTHOR: ENG. DILEESH C. WELLALA
© Copyright Power Logic Engineers Pvt Ltd (PLE). This document contains proprietary information, and remains the property of PLE.
It shall not be copied, nor shall the information herein be divulged to any third party, without written permission from PLE.

2. Agenda
 Electrical Safety
Our Network and MV Substation (Overview)
 Transformers
 Switchgears (OCB, VCB,SF6 Circuit Breakers)
 Battery Bank

3. ELECTRICAL SAFETY MATERIALS
Safety is first in any operation!
Not only mine We are responsible for everyone!

4. SAFETY ELECTRICAL OPERATIONS, MAINTENANCE
• Visual Inspection prior to any decision (Please read signs every time)
• Discuss with Supervisors (Respected parties)
• Conduct operation with instruction provided.
• Follow lockout procedures either communication procedures
• Be responsible

5. VISION AND CORE VALUES
Zero Harm,
Zero Waste,
Self Satisfaction
Employer Satisfaction
…Always
OUR VISION
OUR CORE VALUES
Care
Customer Focus
Valuing People
Integrity
Commitment
Innovation
Competitiveness
Unity

6. OUR NETWORK & MV SUBSTATION (OVERVIEW)

7. Transformers
Power Transformers
From 3MVA up to 550MVA and 400kV
Distribution Transformers
From 16 kVA up to 5000kVA and 72kV

8. CONDITION MONITORING AND REGULAR INSPECTIONS
Regular Inspections
• Transformer Oil Level
• Direct Winding Temperature
Measurement
• Check for Transformer Oil Leaks
(Visual)
• Check Transformer Cooling Systems
• Silica Gel Colour
• Transformer Noise
If you notice anything abnormal, Please inform your Technical head
immediately to prevent any damages.

9. How these will look like??
Transformer Oil Level Indicator
Temperature Gauge Silica gel Breather

10. Transformer Annual Maintenance and
Testings and Special Supervision.
Diagnostic testing of oil, gas and other
insulating materials using in HV Equipment
• Transformers
• Tap Changers
• Circuit Breakers
• Ring Main Units
Transformer Maintenances
• Transformer Winding Insulation Resistance
• Transformer Life Span Tests
• Transformer HT and LT bushing inspection and
maintenance.
• Transformer oil purification
Contact Specialize Technical teams for Maintenances.

11. WE DO NOT WANT ANY OF THIS… !

12. According to international rules, there are only two voltage levels:
• Low voltage: up to and including 1kV AC (or 1,500V DC).
• High voltage: above 1kV AC (or 1,500V DC).
Operation of Circuit breakers:
Make and break all currents within the scope of their ratings, from small
inductive and capacitive load currents up to the full short circuit current, and
this under all fault conditions in the power supply system, such as earth
faults, phase opposition, and so on.
The following stress can occur during making and breaking:
No-load switching
Breaking of operating currents
Breaking of short circuit currents
MV Switchgears (OCB, VCB and SF6)

13. CONDITION MONITORING AND REGULAR INSPECTIONS
Regular Inspections
• Indications Lights
• Function meters (Voltage,
Current)
• SF6 Gas Pressure
• Protection Relays
• Operating Noises
• Operating Counter
If you notice anything abnormal, Please inform your
Technical head immediately to prevent any damages.

14. How these will look like??
SF6 Gas Pressure Voltmeters and Ammeters Fault Indicators (Flags)
Protection Relay

15. THIS IS HOW IT LOOKS LIKE WHEN THERE IS NO REGULAR
INSPECTIONS AND ANNUAL MAINTENANCES

16. Battery Bank (Control Power, Backup Power)
Battery Charger and Panel Nickel Cadmium Alkaline Batteries

17. CONDITION MONITORING AND REGULAR INSPECTIONS
Regular Inspections
• Battery Voltage
• Output Current
• Battery Bank Cooling
System
• Battery Cells
• Battery Water Level
If you notice anything abnormal, Please inform your
Technical head immediately to prevent any damages.

18. How these will look like??
Voltage
Output Current
Operation/Fault Indicators
Battery Water Level (Max, Min)

19. QUESTIONS??????