Protection relays for medium voltage (MV) and high voltage (HV) applications, ensure the safety, reliability, and protection of power transmission and equipment installed in commercial, industrial, infrastructure and transmission segments. Our protection relays are designed to detect abnormal conditions and quickly isolate faulty sections, preventing damage to equipment and minimising downtime. Protection relays play a crucial role in safeguarding the electrical network from various risks, such as overcurrent, arcs, motor malfunctions, transformer issues, capacitor bank problems, generation anomalies, line faults, and more.
At Schneider Electric we have a comprehensive range of protection relays and have grouped them by application below.
Overcurrent Protection Relay: Overcurrent protection relays monitor the current flowing through a circuit and trip the circuit breaker if it exceeds a predefined threshold due to a short circuit, overload, or ground fault.
Arc Protection Relay: Arc protection relays detect and mitigate the risk of arc flash incidents due to faults. They provide rapid arc detection and initiate actions to isolate the fault, protecting both personnel and equipment.
Motor Protection Relay: Motor protection relays monitor the operating conditions of motors, detecting abnormalities such as overloads, phase imbalances, and excessive start-up or running currents. They protect your electrical motor and minimising down-time.
Transformer Protection Relay and Control: Transformer protection relays monitor the condition and performance of transformers, detecting faults, such as overloads, short circuits, insulation failures, and transformer cooling system malfunctions.
Capacitor Bank Protection Relay: Capacitor bank protection relays safeguard the integrity of capacitor banks by monitoring various parameters such as voltage, current, and power factor. They detect overvoltage, overcurrent, and unbalanced conditions, ensuring the reliable operation of your capacitor banks.
Generation Protection Relay: Protection relays for generators, monitor voltage, current, frequency, and power factor. They detect operating faults and prevent generator damage.
Line Differential and Phase Comparison: Line differential relays compare currents at different points along a transmission line to detect faults and initiate protection actions. Phase comparison relays monitor phase angles and detect deviations that indicate faults along the transmission line.
Distance Protection Relay: Distance protection relays determine the distance along a transmission line to a fault by measuring impedance and reactance.
Busbar Differential: Busbar differential relays monitor currents entering and leaving the busbar, which are electrical junctions where multiple feeders connect.
Autoreclose and Check Synchronism: Autoreclose relays automatically re-engage breakers after a fault is cleared, attempting to restore power without manual intervention. Check synchronism relays ensure that the reclosing operation is synchronized to prevent damage to the equipment.
Voltage and Frequency Protection Relay: Voltage and frequency protection relays monitor for under and over voltage and frequency deviations.
Circuit Breaker Failure Relay: Circuit breaker failure relays detect trip failures. They act as a secondary breaker and isolate the faulty breaker for prompt service or replacement.
Dynamic Line Rating and Interconnection Protection Relay: Dynamic line rating relays monitor real-time weather conditions and the transmission line to apply dynamic adjustment. Interconnection protection relays ensure the safe and reliable switching between different power sources.
Marine Protection Relay: Marine protection relays are specifically designed to ensure the safety and reliability of electrical installations on ships, offshore platforms.
Rail Protection Relay: Rail protection relays ensure safe and uninterrupted operation of railway infrastructure, including signalling systems, traction power supply, substations, and overhead lines.
Auxiliary Protection Relays: Auxiliary protection relays support and enhance the functionality of primary protection relays like backup protection or equipment, temperature & vibration monitoring.