EL731-13-00

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Protection Relays & Systems are used to detect, monitor, and react to an electrical fault in order to prevent further damage of equipment and personnel. The EL731-13-00 is an overcurrent relay with an adjustable time delay, and is most commonly used for the protection of machines, short-circuits, and earth faults. In this article we discuss the application field and working principle of the EL731-13-00.

The EL731-13-00 is suited for use in a wide range of application fields. Its adjustable time delay feature makes it an ideal choice for time-delay motor-protection applications. It is also a popular choice of overcurrent protection for circuits and transformer taps, as well as for branch-circuit and feeder-circuit overcurrent applications.

In addition to its suitability for motor-protection applications, the EL731-13-00 is also very useful for electrical-maintenance applications. It allows for effective isolation and testing of circuit breakers and their associated mechanisms. Furthermore, it can be used to measure the status of electrical power-utility networks, detect faults, and provide essential protection to personnel.

The working principle of the EL731-13-00 is fairly simple. The device uses two distinct components to detect and react to overcurrents: the Electromagnetic Element (EME) and the Thermal Element (TE). The EME is used to detect both fault current and phase imbalances. When the current exceeds the set limit, the EME will detect the fault and trip the relay. The TE works in conjunction with the EME to provide overcurrent protection with adjustable time lags. The TE works on the basis of an internal heater, which takes time to react to the current. The time lag can be adjusted by changing the setting of the heater.

The EL731-13-00 is an ideal protection relay for applications involving both overcurrent protection and adjustable time delays. Its EME and TE allow it to effectively detect an overcurrent and trip the relay in a timely manner, while its adjustable time-delay feature makes it suitable for a variety of time-dependent motor-protection applications. With its ease of use and high-performance capabilities, the EL731-13-00 is the perfect choice for a wide range of protection and monitoring applications.

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