EL731-24-00

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Protection relays and systems are specialized devices used in electrical systems to protect against abnormal conditions. EL731-24-00 is one of these systems and this article focuses on its application field and working principle.

EL731-24-00 is a kind of VT second harmonic differential current relay. These relays are used to detect undesirable electrical current conditions in the system, like over-current, leakage, or arcing. They can also detect and indicate harmonic levels or power quality issues.

The application field of EL731-24-00 is mainly protective relaying of transmission and distribution lines or motors, large transformers, and generator unit sets. In these cases, the relays can detect the second harmonic currents. The VT second harmonic differential current relays can also detect fluctuating harmonics. It comes with adjustable settings for different installation requirements.

The working principle of EL731-24-00 is based on a comparison of the primary current and the currents in the second harmonic frequency. It also uses several compensation measures to ensure that false tripping is avoided in case of a fault elsewhere in the power line. Specifically, it uses fixed setting current and Trip Ratio settings, which defines the amount of current by which the relay trips when a fault is detected.

In addition to the settings described above, EL731-24-00 also includes a number of other features. It has fail-safe logic checking, so it can identify faults outside the operational range and deem them as non-trip faults. It also has phase rotation checking to detect any reversal of phase in the current. It has a last-break pickup feature, so it can detect the fault even if it has occurred during a period of low current. It can also detect overload and under-load conditions, as well as negative currents and transformer energization problems.

Another feature of EL731-24-00 is the ability to detect harmonic voltage current in an AC power system. It can detect harmonics up to the 30th level of the AC power system and provides a visual indication of the location and level of fault. It can also measure the distortion of the input current waveform, which can help in diagnosing system faults. Lastly, it has an adjustable time delay, which helps in adjusting the operation of the relay for different applications.

In summary, EL731-24-00 is a specialized differential current relay, mainly used for protective relaying of transmission and distribution lines. It can detect and indicate harmonic levels and power quality issues and it has adjustable settings and advanced features to ensure correct operation.

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