Maximise Performance & Reliability with Expert Switchgear Testing.
At Sigma Power Services (SPS), we provide industry-leading maintenance and testing solutions for high voltage switchgears, ensuring the longevity and reliability of critical assets. Our expertise spans Gas Insulated Switchgear (GIS) and Air Insulated Switchgear (AIS) from low voltage to high voltage, delivering precision, accuracy, and compliance to the highest standards.
Comprehensive Switchgear Testing for Optimal Performance
We conduct a full suite of tests designed to verify switchgear integrity, enhance performance, and mitigate risks. Our services ensure seamless operation, prevent downtime, and extend the life cycle of your assets.
Key Testing Services
Contact Resistance Test – Evaluates electrical contact integrity to minimise energy losses
Insulation Resistance Test – Measures insulation quality to prevent faults and ensure operational safety
Minimum Pick-up Voltage Test – Confirms the responsiveness of protection relays and mechanisms
Breaker Timing Tests – Ensures circuit breakers operate within defined parameters, enhancing reliability
Breaker Trip Operation – Simulates real-world faults by activating breaker trips through protective devices
Advanced Power & Dissipation Factor Testing
We perform detailed evaluations of power and dissipation factors on each pole to detect insulation deterioration and prevent potential failures.
SF6 Gas Analysis & Integrity Testing
Purity Testing – Verifies SF6 gas quality to ensure optimal dielectric properties
Leakage Testing – Detects gas leaks that compromise equipment performance
Pressure Testing – Confirms the switchgear is operating at correct pressure levels
Dew Point Testing – Prevents moisture contamination to safeguard system integrity
Mechanical and Safety Testing
Interlock Testing – Assesses safety interlock functionality to prevent unsafe operations
Earth Switch Testing – Ensures grounding mechanisms operate correctly, safeguarding personnel and equipment
Auxiliary Feature Testing – Evaluates secondary systems that support overall switchgear functionality
Vacuum Bottle Integrity Checks – Verifies vacuum chamber integrity to ensure effective arc quenching
Busbar Inspections and Testing
HiPot Testing – Applies high voltage to test insulation robustness
Tightness Checks – Ensures all busbar connections are secure, preventing energy losses and overheating
Specialised Instrument Transformer Testing (CT/VT)
Our expertise extends to instrument transformers, ensuring accurate performance and protection system coordination.
Insulation Resistance Testing – Verifies the quality of insulation materials
Polarity and Ratio Verification – Ensures proper transformer functionality and accuracy
NGR (Neutral Grounding Resistor) Impedance Testing – Validates grounding system performance to prevent overvoltage damage
Secondary Circuit and Burden Testing – Confirms proper transformer loading and performance
Power and Dissipation Factor Testing – Detects insulation degradation and aging
Excitation Curve Testing – Identifies potential winding defects
Why Sigma Power?
With decades of industry experience, extensive technical knowledge, and a commitment to excellence, Sigma Power Services is your trusted partner for switchgear testing and maintenance. Our proactive approach ensures that your infrastructure remains reliable, efficient, and fully compliant with operational standards.
Protect your investment and ensure the safety of your operations with Sigma Power Services’ cutting-edge testing and maintenance solutions.
High Voltage Switchgears FAQ’s
SPS specialises in maintenance and testing services for both Gas Insulated Switchgear (GIS) and Air Insulated Switchgear (AIS) up to 230kV.
SPS offers a wide range of tests, including Contact Resistance Test, Insulation Resistance Test, Breaker Timing Tests, Minimum Pick-up Voltage Test, and Breaker trip operations through protective devices.
SPS performs rigorous SF6 testing, including purity checks, leakage detection, pressure assessments, and Dew Point tests to ensure the integrity and efficiency of the SF6 gas in GIS systems.
Yes, SPS specialises in comprehensive services for Instrument Transformers, including insulation resistance, polarity, ratio verification, excitation curve, secondary circuit tests, burden tests, power factor and dissipation factor evaluations, and the NGR Impedance Test.
Our Values
Driven by the principle of ‘Delivering Value. Always!’ our core values serve as a foundation for company culture and guide decision making, and interactions with customers, employees and partners across the group.
People
Safety
Exceptional Skill
Exemplary Service
Care
Common Systems