About Us

Superior Quality Transformers
that are Highly Reliable and Durable

About Us

Sanron Oil Group is the trade name for Sanron Transformer Oil Group (PTY) LTD. STOG for short offers a 24-hour, reliable, exible, affordable and effcienton-and-off site maintenance and repairs services, transformer and switchgear testing services and products to power generation, transmission and distribution transformers and switchgear nationally and internationally. Sanron Transformers and switchgear is another division within Sanron Transformer Oil Group (PTY) LTD that deals with all transformer and switchgear supply, installation, maintenance and repairs as well as transformer and switchgear testing. The company is a one-stop, accredited service provider, delivering sustainable and comprehensive transformer services and products, transformer accessories, installation, maintenance and repairs services, supply transformers, transformer oil, oil regeneration, oil preparation and purification. We also provide laboratory services and products; such as sampling, testing, research and laboratory consumables, consulting services, transportation and projects management.

SANRON TRANSFORMER OIL GROUP CUSTOMER SATISFACTION ELEMENTS

Each completed contract shall be a recommendation for further business. Sanron Transformer Oil Group reputation shall form the basis of a long lasting partnership with all customers. The Management is committed to the effective provisioning of the human and material resources required to achieve this. Furthermore, the company will endeavor to ensure that all the quality requirements are understood by all personnel at all times. All work is done in accordance with company procedures which are written down and are updated on an ongoing basis to ensure quality compliance with the latest technology and quality standards, industrial and legal requirements. Our employees are qualified and competent to perform their tasks, also with the job training being done on a continuous basis. All our staff holds proper and required certificates, diplomas and degrees as per requirements of their positions.

Tap Changers:

• Service of Tap Changers
• Changing of contacts
• Installing of off-load Tap Switches

Switchgear

• Supply and Delivery
• New Installations and Commissioning
• Repairs and Maintenance

Transformers

• New Transformer Supply and Delivery
• New Transformer Installations and Commissioning
• Transformer Repairs and Maintenance

INSTALLATIONS, REPAIRS AND MAINTENANCE OF DEHYDRATING BREATHERS

Installation of all types of Transformer Dehydrating Breathers. Supply of silica gel for Transformer Dehydrating Breathers. Retroftting of all types of Transformer Dehydrating Breathers.

Transformer and Switchgear Testing

• Monitoring
• Testing, Diagnosis and Certifcate Of Analysis (Reporting)
• Substations Settings
• Transformer and Switchgear Testing Instruments Rental and Sales

MV and LV Cables

• Cable Installations/Cabling
• Cable Terminations
• Cable Jointing
• Cable Fault Finding/Location
• Cable Identifcation and Spiking
• Cable Diagnosis
• All Electrical Reticulation/Wiring

STOG Divisions and Departments

• Transformer Oil
• Oil Supply
• Oil Purifcation
• Oil Regeneration
• Oil Sampling and Testing
• Oil Monitoring and Conditioning
• Used Transformer Oil (UTO) Reclamation, Collection and Buying

Supply and Delivery of New (Virgin) and Regenerated Oil

Transformer Oil Sampling, Transformer Oil Testing (Analysis) and Purification Reclamation of used insulating Transformer oil. Supply and Delivery of new and regenerated oil is done in bulk loads delivered in specialized, dedicated road tankers, in 1000 litres flow bins), 210 litre drums or 20 litre containers.

HIGH AND LOW VOLTAGE ELECTRICAL SWITCHGEAR AND TRANSFORMER SERVICES OIL CIRCUIT BREAKERS

• Service oil circuit breakers and panels
• Service of vacuum circuit breakers and panels
• Service of gas breakers and panels
• Servicing of High and Low voltage isolators
• On site repairs
• Circuit Breaker Speed Time Test
• Circuit Breaker (Open Gap Test)

SWITCHGEAR TEST SERVICES

• Over-voltage pressure test
• Oil changes on new and refurbished transformers and switchgear
• Provide accessories for new and refurbished transformers and switchgear
• Trip and close coil tests
• Contact resistance check with an Inductor tester
• Contact wear physical inspection
• Speed trip tests
• Service breaker and re-fill with new oil
• Primary and Secondary Injection Tests on Relays
• Issuing Certifcates

TRANSFORMER TEST SERVICES

• Transformer Turns Ratio and
• Sweep Frequency Response Analysis
• Insulation Power Factor (Tan Delta)
• Vector Group Verifcation Test
• Capacitance Test (On Transformer)
• Capacitance Test (On Bushings)
• Percentage Impedance Test (Short Circuit Test)
• Open Circuit Test (Magnetizing)
• DC Winding Resistance Test
• On-Lead Tap Changer Analysis
• Frequency Domain Spectroscopy
• Insulation Resistance Test
• Polarization Index
• Contact Resistance Test
• Power Frequency Voltage Withstand Test
• Earth Resistance Test (Earth Grid Test/Clamp Test)
• AC Dielectric Test
• Issuing Certifcates

Transformer Repairs and Maintenances:

• All kinds of repairs and maintenance on transformers
• All oil leaksr
• Conservator tank
• Bucholz Relay
• Pressure Relieve Valve
• H.V & L.V Bushings
• Inspection Plates
• Bobbins on Transformer
• Gauge Glasses
• Breathers
• Replacing Gasket seals
• Assemble and Dismantle of Transformers
• Complete Rigging of Mobile Transformer up to Commissioning
• Maintenance on NEC & AUX Transformers
• Cleaning of Transformer with High Pressure Washer
• Washing and Painting of all Transformers
• Maintenance of oil leaks