Relay Testing

Numerical Protection Relay Testing & Calibration

iPower Switchgear provides secondary and primary injection protective relay calibration services for numerical, static, and electromechanical relays. We calibrate trip pickups, time-delay curves, and directional protection elements per IEC 60255 and IEEE C37.90 standards.

Modern numerical relays (ABB Relion, Siemens SIPROTEC, Schneider MiCOM, SEL) require periodic functional verification to ensure trip logic algorithms activate breaker coils accurately. We inject high-precision voltage and current signals to map operating time against specified IDMT trip curves.

Protective Elements & Tests Conducted

• Overcurrent (50/51) & Earth Fault (50N/51N): Pickup current verification, Operating Time testing across IDMT curves (Normal, Very, Extremely Inverse), and instantaneous element high-set timing.
• Differential Protection (87T / 87M / 87B): Bias characteristic curve testing, harmonic restraint (2nd and 5th harmonic blocking), and minimum pickup measurement for transformer and motor differential relays.
• Directional Overcurrent (67/67N) & Voltage Relays (27/59): Maximum Torque Angle (MTA) verification, directional boundary checks, and under/over voltage pickup and drop-off timing.
• CT & PT Ratio / Magnetization Curve Test: Kneepoint voltage (Vk) determination, excitation current measurement, and polarity verification for protection current transformers.

Related Field Testing Services

Advanced Engineering Standards & Operational Quality

At iPower Switchgear, all Relay Testing projects are executed in strict accordance with ISO 9001:2015 quality management procedures, Central Electricity Authority (CEA) safety guidelines, and applicable Indian & International standards (IS / IEC / IEEE). Our experienced team conducts on-site field audits, digital twin simulation modeling, and rigorous pre-commissioning checks to eliminate operational vulnerabilities.

Whether you are establishing a new industrial facility, upgrading existing sub-station infrastructure, or requiring emergency engineering support in Gujarat, our certified engineers deliver comprehensive technical documentation, stamped test certificates, and actionable recommendations to optimize long-term asset performance.

Secondary & Primary Injection Relay Testing Standards

Our protective relay testing programs follow IEC 60255, IEEE C37.90, and NETA testing specifications:

• Secondary Injection Testing (Omicron / Megger): Injecting precise current and voltage signals to verify pickup thresholds, operating timing against IDMT curves, and trip outputs.
• Primary Injection Testing: Passing high current through primary conductors and CTs to verify the complete protection loop including CT ratios, wiring, and breaker trip coils.
• CT Magnetization & Kneepoint Curve Test: Verifying protection CT excitation curves, kneepoint voltage (Vk), and winding resistance.
• Numerical Relay Families Supported: Complete calibration support for ABB Relion, Siemens SIPROTEC, Schneider MiCOM, SEL, and Woodward relays.

Automated Omicron Test Scripts & Tripping Logic Verification

Our protection technicians utilize automated Omicron state-sequencer test templates to test directionality (67/67N), differential slope characteristics (87T), and distance protection zones (21), generating un-editable electronic test certificates.