18258230. Restricted Earth Fault Relay simplified abstract (Mitsubishi Electric Corporation)
Contents
Restricted Earth Fault Relay
Organization Name
Mitsubishi Electric Corporation
Inventor(s)
Reiji Watase of Chiyoda-ku, Tokyo (JP)
Shigeto Oda of Chiyoda-ku, Tokyo (JP)
Restricted Earth Fault Relay - A simplified explanation of the abstract
This abstract first appeared for US patent application 18258230 titled 'Restricted Earth Fault Relay
The abstract describes a restricted earth fault relay that includes various units for calculating differential amounts, detecting changes in phase currents, and determining operation signals for protecting a three-phase transformer.
- First, a first differential amount calculation unit calculates a first differential amount based on a zero-phase current and a neutral point current.
- Next, a current change detection unit detects changes in the phase currents.
- A first suppression amount calculation unit calculates a first suppression amount, with a first maximum value being determined when changes in phase currents are detected.
- An operation determination unit outputs a protection signal when the first differential amount and the first suppression amount are within an operating region.
Potential Applications: - Protection of three-phase transformers in electrical systems. - Fault detection and prevention in power distribution networks.
Problems Solved: - Detecting and mitigating restricted earth faults in electrical systems. - Ensuring the safe and efficient operation of three-phase transformers.
Benefits: - Enhanced safety and reliability of electrical systems. - Early detection and response to earth faults, minimizing downtime and damage.
Commercial Applications: Title: "Advanced Restricted Earth Fault Relay for Transformer Protection" This technology can be used in industrial facilities, power plants, and utility substations to safeguard critical equipment and prevent costly disruptions in power supply.
Questions about Restricted Earth Fault Relay: 1. How does the first suppression amount calculation unit determine the first maximum value? 2. What are the key advantages of using a restricted earth fault relay in electrical systems?
Frequently Updated Research: Stay updated on the latest advancements in earth fault protection systems and transformer safety measures to ensure optimal performance and reliability in electrical networks.
Original Abstract Submitted
A restricted earth fault relay includes: a first differential amount calculation unit that calculates a first differential amount based on a zero-phase current and a neutral point current; a current change detection unit that detects changes in the phase currents; and a first suppression amount calculation unit that calculates a first suppression amount. When the changes in the phase currents are detected, the first suppression amount calculation unit calculates a first maximum value as the first suppression amount, the first maximum value being a maximum value of effective values of the subtraction currents in the phases and an effective value of the neutral point current. The restricted earth fault relay further includes an operation determination unit that outputs a protection signal for protecting a three-phase transformer, when the first differential amount and the first suppression amount are within an operating region.
