724X

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The 724X series of line and generator differential relays provide a reliable and precise means of protection for transmission lines, generators, motors, and transformers. They are designed to identify faults within their protective zone and to disconnect the affected electrical circuit. The 724X series of protections relays work based on the principle of line or generator differential which measures the current flowing from both end terminals of the protected equipment.

The 724X series is suitable for use in medium voltage protection schemes on both single line and double line configurations. It has been designed and developed for a variety of applications, including overhead line protection, generator protection, transformers protection, and motor protection. The relay offers comprehensive coverage with extensive configurability and is suitable for a wide range of primary, back-up, and supplementary protection.

When a current passes through a line, it will produce two back EMF or also known as e.m.f. The difference between the two e.m.f.’s, called the differential voltage will be the measure for the line’s current. The 724X series of protection relays is a total power sensitive device, meaning its entire current rating sum is divided up to calculate overcurrent, undercurrent, and other parameters. It translates the differential voltage into a digital signal that is readable by the relay and allows it to measure the line’s current. The differential voltage sensed by the relay is compared with the pre-set pick-up setting and if the expected parameters are exceeded, the relay trips the circuit, isolating it from the power source.

The 724X series is also equipped with several additional protection functions to ensure ultimate safety. There is a specifically designed protection function for reverse-direction power flow in double line and transfer bus protection applications, enabling the system to detect unbalanced current conditions which would otherwise go unmonitored in a system where power is transmitted over a single line. To improve detection speed, the 724X series is equipped with high speed current sampling so that short-duration disturbances are detected faster. Finally, a wide range of protection functions and setting parameters allow the adaptation of the 724X series to different system conditions.

In conclusion, the 724X series of differential protection are designed to provide an accurate and reliable means of protection for transmission lines, generators, motors, and transformers for various applications. This dependable protection is achieved by measuring the differential voltage between two terminals of the protected equipment. It then translates this voltage into a digital signal that is readable by the relay and allows it to measure the line and equipment’s current. The 724X series is equipped with additional protection functions to enhance safety, such as reverse-direction power flow detection, high speed current sampling, and a wide range of protection functions and setting parameters.

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