Schneider Electric PowerLogic™ MiCOM P921 Voltage and Frequency Management Relay

Schneider Electric PowerLogic™ MiCOM P921 Voltage and Frequency Management Relay is designed for power systems where frequency stability, voltage control and controlled load management are all important. It is used in networks that need a dependable way to respond to underfrequency, overfrequency and abnormal voltage conditions without creating unnecessary disruption to connected loads.

The MiCOM P921 is more than a basic voltage or frequency relay. It combines protection, measurement, automation and control functions in one platform, which makes it useful for both new installations and retrofit projects. Utilities and industrial power systems can use it for load shedding, generation shedding and system restoration schemes where quick action is needed to maintain network stability.

One of the practical strengths of the P921 is its ability to support restoration after a disturbance. Once the system recovers, the relay can help reconnect disconnected loads in a controlled way, reducing downtime and helping restore normal operation faster. Its logic capabilities also allow the relay to be used in both simple and more complex management schemes depending on the needs of the installation.

Specifications

• Manufacturer: Schneider Electric
• Product Family: PowerLogic™ MiCOM
• Model: MiCOM P921
• Relay Type: Numerical Voltage and Frequency Management Relay
• Protection Application: Voltage and frequency protection, load shedding and power system management
• Main Functions: Voltage monitoring, frequency monitoring, automation and restoration logic
• Suitable For: Utility substations, industrial power systems and network control schemes
• Measurement Accuracy: High frequency measurement accuracy for system stability applications
• Logic Capability: Supports load and generation management logic
• Output Contacts: Up to 30 output contacts depending on configuration
• Restoration Function: Automatic load restoration after system recovery
• Integration: Suitable for new and existing network control systems
• Communication: Supports standard communication protocols depending on relay configuration

Features

• Voltage and frequency management relay for power system stability applications.
• Suitable for load shedding and generation management schemes.
• Supports automatic restoration of disconnected loads after system recovery.
• Combines protection, control, automation and measurement in one relay.
• Can be integrated into both new and existing network control systems.
• Designed to avoid unwanted operation during non-linear disturbances and sub-oscillations.
• Logic functions allow both simple and complex control schemes.
• Helps improve power quality by maintaining voltage and frequency stability.

Applications

• Underfrequency load shedding schemes
• Overfrequency and abnormal frequency protection schemes
• Voltage monitoring and voltage management applications
• Power system stability schemes
• Utility substations
• Industrial captive power systems
• Load restoration and demand management systems
• Network automation and control applications

Schneider Electric PowerLogic™ MiCOM P921 Voltage and Frequency Management Relay is suited for applications where maintaining system stability matters just as much as protecting equipment. It gives operators a practical tool for managing frequency events, voltage disturbances and controlled load restoration without adding unnecessary complexity to the scheme.