Varatharaj Ayyavelu

Description :-

1. Transformer : Up to 140MVA ,66/33KV, 33/6.6KV, 6.6 KV Transformers Maintenance, Ventilated and Hermetically Sealed types covering examinations including Leakage, Insulation Testing and Parallel Operations condition, fault investigation, rectification, testing and maintenance of Transformer and it accessories. Experience in SF6 and Nitrogen Filled, Gas Insulated Breakers, handle Bucholz Relay and Transformer Oil Testing like BDV and Oil DGA Analysis Testing.

• Malindi, Langobaya 40MW Solar Power PV Project, Electrical Commissioning Technician
• December 2020 - May 2024 (2 years 3 months)
• Nairobi, Malindi, Kenya

Description : -

* Installation & Wiring * : Installing DC/AC systems for residential 3kW to commercial 1MW+ solar PV plants. DC string wiring, combiner boxes, inverters, AC panels, transformers, and grid interconnection per NEC, IEC, and SEC standards.

* Testing & Commissioning * : Performed insulation resistance, polarity, continuity, I-V curve, and earthing tests. Commissioned SolarEdge, Huawei, SMA, ABB, and Fronius inverters. Verified CT/PT, metering, and anti-islanding protection.

* Troubleshooting * : Diagnosed faults in PV strings, MC4 connectors, breakers, contactors, surge devices, and inverters. Used Fluke multimeters, clamp meters, thermal cameras, and insulation testers to cut downtime 60%+.

* Protection & Control * : Installed and maintained AC/DC disconnects, fuses, circuit breakers, SPDs, and grounding systems. Wired monitoring, SCADA, and data loggers for remote diagnostics.

* O&M Support * : Conducted preventive electrical maintenance: torque checks, IR scanning, meggering, and panel cleaning. Replaced failed components and upgraded systems for higher yield and safety compliance.

• Amin 105MW Solar Power PV Project, Electrical Commissioning Technician
• November 2019 - January 2020 (3 months)
• Mascat, Oman

• Risha Power 50MW Solar Power PV Project, Electrical Commissioning Technician
• August 2019 - October 2019 (3 months)
• Amman, Jordan

• Saimai 104MW Solar Power PV Project, Electrical Commissioning Technician
• May 2019 - August 2019 (4 months)
• Ho Chi Minh City, Vietnam

• Dec 2012 - Jun 2017 ( 4 yrs 7 mos )
• Abu Dhabi, United Arab Emirates (UAE)

Description :-

1. Transformer : Up to 140MVA ,66/33KV, 33/6.6KV, 6.6 KV Transformers Maintenance, Ventilated and Hermetically Sealed types covering examinations including Leakage, Insulation Testing and Parallel Operations condition, fault investigation, rectification, testing and maintenance of Transformer and it accessories. Experience in SF6 and Nitrogen Filled, Gas Insulated Breakers, handle Bucholz Relay and Transformer Oil Testing like BDV and Oil DGA Analysis Testing.

2. Generators : Maintenance of 31.8 MW Gas Turbine Generator with AVR, Excitation System in Cylindrical Rotor AC Generator and handling Auxiliary Motors maintenance and its Switch Gears.

3. Switch Gears : Handle LT & HT Switch Gears ranging from 440V, 3.3KV, 6.6KV, 11KV, 33KV, 66KV, 110KV SF6 Circuit Breakers, Vacuum and Air Circuit Breakers, Isolators, Bus Ties and Bus Duct System covering examinations, general maintenance including Contact Resistance Test, Insulation Test, Service Checks and Fault Investigation.

4. PCC and MCC : Operations and maintenance of Power / Motor Control Center with different type of Breakers, Contactors and Control Systems in Gas Insulated Switch Gear Room and Pressurization Substation.

5. UPS and Battery Charges : Work upto 120 KVA UPS, Battery Charger and all type of battery covering maintenance and fault rectification.

6. Cable Installation : Handle Cable Laying, Glanding, Termination and having more knowledge in LT Cable Joints covering cable work with ducting system, cable insulation test and fault investigation, find out the fault location and rectification.

• Construction Electrician ( Kudankulam Nuclear Power Plant )
• Oct 2010 - Jun 2011 ( 9 mos )
• Kudan Kulam, Tirunelveli - Dist, Tamil Nadu, India

Description : -

* Plant Systems * : Electrical systems in a 1000 MW VVER-1000 nuclear power plant. Worked on 6.6kV, 415V, and 220V AC/DC systems, Class 1E safety-related and non-safety switchgear, MCCs, distribution boards, and emergency diesel generators.

* Equipment Maintenance * : Preventive & corrective maintenance of HT/LT motors, transformers, switchgear, circuit breakers, protective relays, UPS, battery banks, and cathodic protection systems. Performed insulation resistance, contact resistance, timing tests, and tan-delta testing per NPCIL/AERB standards

* Protection & Control * : Maintained electrical protection schemes for generators, transformers, and motors. Tested numerical relays: ABB, Siemens, GE. Worked on DCS/PLC interfaces, synchronizing panels, and auto-changeover schemes for Class-III & Class-IV power supplies.

* Safety & Compliance * : Strict adherence to AERB guidelines, NPCIL safety manuals, LOTO, radiation protection, and work permit systems. Participated in emergency preparedness drills and seismic qualification checks for electrical equipment.