721X

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Protection Relays & Systems have long been designed to protect electrical equipment from damaging currents and restore power quickly wile minimizing equipment damage.The 721X application field and working principle is an example of these protections systems. It\'s designed for fast-reacting current monitoring and protection of medium-voltage installations in the highest accuracy and energy-measurement class.

The 721X is a fast-reacting protection system with selectable short-term, medium-term or long-term inverse-definite-minimum-time overcurrent relays, with or without ground-faukt protection, suitable for a wide range of applications. Its comprehensive set of features already meets many needs for the most common protection functions, while its extended range and configurable parameters provide the flexibility to accommodate more specific protection requirements.

The 721X is an advanced protection system designed to protect electric equipment from overcurrents and other electrical disturbances. It utilizes an inverse-definite-minimum-time (IDMT) overcurrent relay, and has selectable short-term, medium-term, or long-term settings. The IDMT allows the relay to react quickly to fault conditions with higher levels of current. The recovery time for long-term protection is adjustable to a minimum level, while other short-term settings are selectable for faster fault detection in high impedance arcs or solid faults. Combined with the adjustable setting of the long-term protection, this provides comprehensive protection at all current ranges.

The 721X protection system is designed to work with digital simulators to allow easier configuration and operation. This allows for easier testing, commissioning, maintenance and troubleshooting, including remote parameter changes. With its built-in IG or GPS input, the 721X can facilitate current injection testing of overcurrent protections, as well as remote verification and commissioning.

The 721X also provides protection for motors and associated motor control systems. It can detect ground faults, phase loss or imbalance, over- or under voltage, and other disturbances at the motor terminals. This protection is designed to protect against personal injury or equipment damage that may occur due to the motor suddenly operating at a different frequency or voltage.

In addition to protection, the 721X includes advanced energy-measurement capabilities. The system can measure active, reactive, and apparent energy for three-phase lines, with selectable integration time constants and a wide range of reporting options. This allows for more accurate billing and better control of energy usage.

The 721X is a versatile control system, able to protect electrical systems from any fault and provide accurate energy-measurement capabilities. Its relay settings are easily adjustable to accommodate different power supply characteristics, and its advanced features can protect from unexpected events. The built-in digital simulator also allows for easier commissioning, testing and maintenance. With both its protection and energy-measurement capabilities, the 721X is a powerful tool to ensure safe and reliable operation of electrical systems.

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