37.473

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37.473 is a family of differential protection relays used for the protection of low, medium, and high voltage apparatus. Its most common application is in the protection of power transformers from over currents, direct faults, and restricted earth faults. These relays can be used for both transmission and distribution equipment.

37.473 relays have both analog and digital inputs and outputs, enabling them to be used with a variety of protection systems and configured to fit the requirements of most electrical systems. The relays come in two versions, one for single-line protection, and another for two-line protection. These relays have high reliability, excellent immunity, low consumption, unaffected by harmonics, stable performance, and short reaction times.

Working Principle

The working principles of the 37.473 relay is based on a method known as differential protection. This method requires each phase of the protected equipment to be monitored and compared. When the measured difference (or differential current) between the phases exceeds a certain threshold, the relay will operate and disconnect the equipment to prevent damage.

In most cases, the differential protection is supplemented by other protection devices, such as over current protection, earth fault protection, and frequency and voltage protection. The relay itself will have specific settings for individual types of protection, such as minimum and maximum threshold values, and the time delay of the disconnection.

The settings of the relay can be set remotely using a Human Machine Interface (HMI), or manually with the use of a software interface. On-site troubleshooting and maintenance also requires some technical knowledge of the different relay settings and functions.

Advantages

The 37.473 relay offers some major advantages over traditional protection systems, such as Over Current and Earth Fault protection. In particular, the differential protection offers better accuracy when it comes to distinguishing between direct and indirect faults, and it can also detect intermittent faults such as lows and surges.

The relay also has a faster reaction time, and offers robust protection in comparison to other protection relays. The flexible configuration of the relay also allows the user to customize the settings to fit their specific application. With its low energy consumption, the 37.473 relay is an incredibly efficient solution for electrical systems.

Conclusion

The 37.473 relay is a versatile and reliable family of different protection relays, designed to protect power equipment from a variety of faults. Its differential protection scheme provides accurate, robust protection, while its flexible configuration allows it to be used with a wide range of protection systems. With its fast reaction time and low energy consumption, the 37.473 relay is an efficient and cost-effective solution for electrical systems.

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