Meanwhile, upgrading with previous Veuxbus series models has led to over-engineering that creates problems in terms of installation space and cost. The analog relays in widespread use among general power providers have been used for over 30 years and are ready for upgrading. Veuxbus series models are protective devices used to protect components such as substation busbars, substation transformers, and transmission lines. Hitachi’s Veuxbus series is a major product line provided mainly to Japanese power companies. Veuxbus Series Digital Relays: A Single-unit Solution Hitachi started making successive shipments to power stations starting in July 2020, and the first unit began operating in September 2020.Ģ. Its configuration uses separate lines and supports up to eight terminals. The device was developed as a resistance-grounded transmission line protective relay device. So, a new function for preventing unneeded operation has been provided. However, when connected within line intervals protected by transmission line protective relays, these power sources could generate outflow currents causing unneeded operation of transmission line protective relays when external failures occur. Grid connection of renewable energy-based power sources is expected to grow in the coming years. By replacing dedicated communications equipment with general-purpose Ethernet, the developed device enables a greater degree of freedom in transmission line configurations and helps lower overall protection relay system cost. Hitachi has recently developed a transmission line protective relay device that uses a layer 2 (L2) switch (a general-purpose Ethernet communications device), making it possible to use a general-purpose Ethernet interface instead of a dedicated communications board. The plesiochronous digital hierarchy (PDH) communications method has conventionally been used along with a dedicated communications control board mounted on the protective relay device. These devices were developed about 30 years ago, and have always used power company communications equipment for data transmission. They transmit current data back and forth between terminals and calculate the differential current to detect whether a failure has occurred in the applicable line interval. #66KV GAS INSULATED SWITCHGEAR PRICE REFERENCE CODE#Pulse code modulation (PCM) current differential relays are protective relay devices for transmission lines. For example, general-purpose communications technologies that enable high-speed, high-capacity communications such as Ethernet communications and the Internet Protocol (IP) are becoming increasingly commonplace. The rapid advancement of the information-oriented society in recent years has resulted in increasingly advanced communications network technology.
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