SE-KP2EN

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Protection relays and systems play an important role in ensuring the reliable operation of any power transmission system. SE-KP2EN is a popular digital protection relay designed for protecting medium and low voltage networks. This article will provide an overview of the SE-KP2EN application field and working principle.

The SE-KP2EN is a multi-function, intelligent protection relay system that is designed to provide effective protection for medium and low voltage networks. It is suitable for applications in wide voltage range up to 690V in three-phase AC networks, as well as for applications in single-phase AC networks up to 460V. The SE-KP2EN can be used for both over-current and over-voltage protection, as well as for earth fault/ground fault protection, under/over frequency protection, and other functions.

The SE-KP2EN is designed with a flexible and modular structure. It is composed of a base unit that offers basic protection features, and additional modular units that offer additional features and options depending on the individual application. The base unit includes an input module that provides input power and voltage input, a microprocessor controller module, and up to three output modules, which provide trip and trip reset signals to the main circuit breaker to open and close it in the event of a fault. The modular units provide additional protection features, such as earth/ground fault protection, over-current and over-voltage protection, under- and over-frequency protection, and more.

The basic working principle behind the SE-KP2EN is to measure the voltage or current of the protected system, and then compare it against pre-determined thresholds or programmed limits. If the measured value exceeds the threshold or limit, the SE-KP2EN will trip the main circuit breaker, thereby isolating the system from potential faults. Additionally, the SE-KP2EN can be configured to provide alarm signals for any abnormal events, such as excessively high or low voltage or current levels, or under/over frequency conditions.

The SE-KP2EN also offers advanced features for enhanced system reliability, such as Group Fault Function (GFF), Locked Out Fault Function (LFF), Instantaneous Trip Function (ITF) and Fault-Resistant Logic Function (FRL). GFF allows simultaneous protection to be applied to up to four circuits, thereby reducing the risk of load unbalance. LFF prevents the system from resetting if a fault condition has been identified. ITF trips the system immediately, limiting the fault current for a limited time, and FRL reduces the risk of false tripping caused by high frequency interference.

In addition to providing protective functions for medium and low voltage networks, the SE-KP2EN offers various monitoring capabilities. It can monitor the power system\'s voltage, current, frequency, and power quality, as well as the operational condition of the main circuit breaker. It also offers built-in fault diagnostics, enabling quick and easy fault location and system troubleshooting. Finally, the SE-KP2EN provides a range of communication protocols, such as Modbus, CAN, and Ethernet, allowing the system to be monitored and controlled remotely.

In summary, the SE-KP2EN is a digital protection relay system that provides effective protection for medium and low voltage networks. Its modular structure allows it to be tailored to the individual application, and its advanced features help to ensure reliable operation. The SE-KP2EN can also be used to monitor the power system, and its various communication protocols enable remote monitoring and control.

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