Our Services

We provide the following professional services for multiple sectors including mining, oil & gas, utilities, renewables & defense.

TESTING AND COMMISSIONING

Testing and commissioning services ensure your equipment and systems are safe and meet critical standards and specifications throughout the lifecycle of your project.

Factory and Site Acceptable Testing and Commissioning
Power Systems Commissioning
Switchgear Testing and Commissioning (HV/LV)
GIS Substation Testing and Commissioning
High Voltage Components Testing and Commissioning

HIGH VOLTAGE SWITCHGEARS

Sigma Power offers a wide range of maintenance and testing services for GIS and AIS switchgear up to 230kV.

Contact Resistance Test
Insulation Resistance Test
Minimum Pick-up Voltage Test
Breaker timing Tests
Breaker trip operation through the protective device
Power and dissipation factor on each pole
SF6 purity test
SF6 Leakage test
SF6 Pressure test

PARTIAL DISCHARGE

A localized electrical discharge that only partially bridges the insulation between conductors and which can or cannot occur adjacent to a conductor” quoted from IEC60270 verbatim.

Corona – discharges to air
Floating Electrode – metal to metal
Voids – gaps in solid insulation or cavities as well as gas bubbles in liquid insulation
Surface Discharge – tracking on the outside surface of insulation traveling towards other conductors or ground

POWER CABLES

Sigma Power offers a broad range of testing and jointing services to give you detailed information about the insulation condition of your power cables.

VLF withstand Test
VLF Tan Delta Test
Offline and Online Partial Discharge Test
Insulation Resistance and Polarisation Index Test
Sheath Integrity Test
Fault location and Pin Pointing
TDR Test

Transformers

Sigma Power offers a wide range of maintenance, testing, condition monitoring, oil analysis, and repair services for the transformers.

Capacitance & Dissipation Factor (C&DF)/Tan Delta/DLA Test
Transformer Turns Ratio (TTR) Test
Winding Resistance Test
Dynamic Resistance Measurement Test
Tap Changer Analysis
Vector group identification
Dirana Test

Rotating Machines

Sigma Power offers a wide range of Rotating Machines testing services for generators and motors insulation condition assessment.

Insulation Resistance & Polarization Index
Offline and Online Partial Discharge Measurement
Tan Delta and Capacitance Measurement
AC/DC Dielectric withstand Voltage Test
Winding Resistance Test
Step Voltage Test
Recurrent Surge Oscillography (RSO) Test

Earth Testing

A well-designed earthing system is the basis for any electrical installation in order to ensure the danger associated with fault currents is avoided, protecting both equipment and personnel.

Earth Grid Impedance
Step and Touch Potential
Earth Potential Rise
Soil Resistivity Testing and Modelling
Earth Continuity
Off Grid Current Injection

Protection Relays

A well-designed earthing system is the basis for any electrical installation in order to ensure the danger associated with fault currents is avoided, protecting both equipment and personnel.

Over Current
Locked Rotor Condition Test
Test for Loss of Excitation
Phase Squance Test
Restricted Earth Fault test
Over Excitation Test
Differential Protection Test