Overview

Brought to you by Lauritz Knudsen Electrical & Automation-India’s largest manufacturer of LT Switchgear, the numrAL series of DRAW-OUT type numerical Protection Relays offer comprehensive Protection along with Control and Monitoring features. The intelligent algorithm of numrAL numerical relay series ensures enhanced Sensitivity, Selectivity, and Speed for a reliable Power System Protection. A wide range of advanced Numerical relays are specifically designed for both Low Voltage (LV) and Medium Voltage (MV) power system protection and control applications.

Discover Our Range of Protection Relays

Over Current & Earth Fault Relays

Over Current & Earth Fault Relays

numrAL - Numerical Relays provide highly reliable protection by monitoring phase (Overcurrent) and residual (Earth Fault) currents. As microprocessor-based draw-out units employ fast digital signal processing and advanced algorithms to quickly analyze fault magnitude and duration, ensuring that the circuit breaker isolates only the damaged section of the electrical system.

Voltage Monitoring Relay

Voltage Monitoring Relay

numrAL - Numerical Voltage Relays provide high-speed, precise protection by continuously monitoring voltage for anomalies like Over-voltage (59), Under-voltage (27) ensuring rapid fault isolation and safeguarding critical grid assets. As microprocessor-based draw-out units employ fast digital signal processing and advanced algorithms to quickly analyze fault magnitude and duration, ensuring that the circuit breaker isolates only the damaged section of the electrical system.

Motor Protection Relays

Motor Protection Relays

numrAL - Numerical Motor Protection Relays are integrated, microprocessor-based draw-out devices that utilize advanced digital algorithms for precise, high-speed protection against all major motor faults (49, 50/51, 46/47), safeguarding critical assets and providing detailed diagnostics. As microprocessor-based draw-out units employ fast digital signal processing and advanced algorithms to quickly analyze fault magnitude and duration, ensuring that the circuit breaker isolates only the damaged section of the electrical system.

Restricted Earth Fault Relay

Restricted Earth Fault Relay

numrAL - The Numerical Restricted Earth Fault (REF) Relay (ANSI 64) is a microprocessor-based draw-out unit that provides sensitive and selective protection for transformer and generator windings. By digitally comparing phase and neutral currents, it quickly and stably detects internal ground faults (even those near the neutral point), which are often missed by conventional differential schemes. As microprocessor-based draw-out units employ fast digital signal processing and advanced algorithms to quickly analyze fault magnitude and duration, ensuring that the circuit breaker isolates only the damaged section of the electrical system.

Neutral Displacement Relay

Neutral Displacement Relay

numrAL - Numerical Neutral Displacement Relay is a microprocessor-based relay providing highly sensitive earth fault protection in ungrounded systems. It operates by detecting zero-sequence voltage (neutral displacement), ensuring rapid and reliable isolation for faults that are difficult for conventional protection to clear. As microprocessor-based draw-out units employ fast digital signal processing and advanced algorithms to quickly analyze fault magnitude and duration, ensuring that the circuit breaker isolates only the damaged section of the electrical system.

Why choose Numerical Protections Relays by Lauritz Knudsen?

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