4420.0179

Protection relays and systems are an important component of the power system, providing protection against any kind of fault or abnormal condition. The 4420.0179 is a protection relay specifically designed for protection of single-phase transformers, which is widely used in many transformer manufacturers, power plants and substations. The protection relay is equipped with very advanced protection functions, plus a high degree of flexibility, making it suitable for a wide range of applications.The Applications of 4420.0179The 4420.0179 protection relay is designed for the protection of single-phase transformers, including those with a main winding and a tertiary winding, those with two or more main windings and tertiary windings, as well as those with one main winding and two or more tertiary windings. In addition, it can also be used for the protection of three-phase transformers with two or more main windings and two or more tertiary windings.The 4420.0179 is configured with an overcurrent protection layer and a differential protection layer. The overcurrent protection layer is composed of two independent time-overcurrent elements. The first one is the primary time-overcurrent curve that is used to protect the transformer against over-loads, short-circuits, and internal faults. The second one is the secondary time-overcurrent curve that is used to protect against external faults, such as those caused by arcing grounds or other external sources.At the same time, the differential protection layer is composed of one independent differential element, which is used for the protection of the transformer against internal asymmetric faults. The 4420.0179 also has the capability to discriminate between faults on main windings and distinctions on tertiary windings.Working Principle of 4420.0179The 4420.0179 operates by measuring the electrical characteristics of the transformer. The overcurrent protection layer continuously monitors current flowing through the transformer. When the current exceeds a pre-defined threshold, the first element of the protection relay is triggered and an alarm is sent to the control system. If the current continues to increase, the second element of the protection relay will be triggered and the breaker or fuse will be tripped off, thus preventing further damage to the transformer.At the same time, the differential protection layer operates by continuously monitoring the voltage and current on each of the transformer’s windings. When an internal asymmetric fault occurs, the voltage and current on one side of the transformer will be significantly different from the other side. This difference is measured by the differential element of the protection relay and it will be tripped off to prevent any further damage to the transformer.ConclusionThe 4420.0179 protection relay is designed for the protection of single-phase and three-phase transformers. It is composed of an overcurrent protection layer and a differential protection layer, both of which are capable of detecting any kind of fault or abnormal condition quickly and accurately. Thus, the 4420.0179 is a reliable and highly effective protection relay that can help to ensure the highest levels of safety and reliability of transformer systems.