Siemens Smart Grid Division is stepping up the development of process bus technology in the high voltage power transmission grid with a new process bus input card for their Siprotec 5 series of protection devices and a newly developed input/output unit (merging unit).
The process bus has advantages especially in the high-voltage area where protection devices are normally installed at some distance from the instrument transformers. The merging units can be mounted near the instrument transformers and can be connected to the protection devices via fiber-optic Ethernet connections instead of via copper cable as at present. This not only reduces cabling and maintenance costs but cuts costs for installation and for the actual cable. The process bus technology also increases the flexibility of the protection system.
Without the process bus, the protection devices are connected to the instrument transformers directly with copper cables. Since this has to be done for every single signal, it increases the amount of wiring necessary in the switching station. This can be reduced by using process bus technology. With classic protection devices the process data is measured directly in the protection device via a special input card. This analog input card consists of an input circuit, an analog-digital converter and a bus connection to the CPU. All these connection terminals are located inside the device and are manufacturer-specific.
With Siemens process bus technology, the input card is separated from the CPU of the protection device and the range of the bus is extended from a few centimeters to as much as two kilometers. This separation creates two devices. The existing analog input card and the bus connection form the merging unit which can now be installed close to the instrument transformer and thanks to the process bus well away from the protection device. The protection device has been fitted with a process bus input, and the former input card is no longer used. The communications interface between merging unit and protection device has been standardized in IEC 61850-9-2 in order to create the necessary interoperability.
Process bus technology allows the merging unit to be installed close to the instrument transformer, which reduces the length of the copper connecting cable between the transformer and merging unit. The merging unit is equipped on the output side with fiber-optic Ethernet ports and the connection between merging unit and protection device is provided by fiber-optic cables. Instead of wiring the analog transformer inputs to the protection device as in the past, with the process bus the merging unit is connected close to the transformer, and the collected data distributed from there via Ethernet.
The process bus also increases the flexibility of the protection system. Using Ethernet as the communication channel, telegrams from more than just one protection device can be received and processed by the same merging unit without the need for additional cabling. This additionally reduces the cabling work necessary in the entire system. Expansion of the system is also possible without great cost and effort. An additional protection device can be installed in the switching station by inserting a cable to the Ethernet communications interface. Since the added protection device is usually at the same location as the other devices, the process bus infrastructure is already in place there. This means that the only cabling required for the new device is for connecting it to the system.
Automation of switchgear in accordance with IEC 61850-8-1 is state of the art today. The binary data that used to be transmitted between protection devices via directly wired, discrete binary inputs and outputs is now replaced by Goose messages (Generic object oriented substation events). This technology already reduces the number of copper cables and is widely used. The success of Goose messages in replacing copper cables has shown how successfully Ethernet technologies can improve the effectiveness and reliability of energy automation systems. The reduction of copper cables, and higher system reliability and security at substations will also help pave the way for the process bus.
Energy-efficient, eco-friendly solutions for setting up intelligent power supply networks (Smart Grids) and the associated service are part of Siemens' Environmental Portfolio. Around 43 percent of its total revenue stems from green products and solutions. That makes Siemens one of the world's leading providers of eco-friendly technology.
The Siemens Infrastructure & Cities Sector (Munich, Germany), with approximately 90,000 employees, focuses on sustainable and intelligent infrastructure technologies. Its offering includes products, systems and solutions for intelligent traffic management, rail-bound transportation, smart grids, power distribution, energy efficient buildings, and safety and security. The Sector comprises the divisions Building Technologies, Low and Medium Voltage, Mobility and Logistics, Rail Systems and Smart Grid. For more information please visit http://www.siemens.com/infrastructure-cities
The Siemens Smart Grid Division (Nuremberg, Germany) offers power providers, network operators, industrial enterprises and cities an end-to-end portfolio with products and solutions to develop intelligent energy networks. Smart Grids enable a bidirectional flow of energy and information. They are required for the integration of more renewable energy sources in the network. In addition, power providers can run their plants more efficiently with data gained from Smart Grids. Software solutions that analyze data from Smart Grids will continuously gain importance. Thereby, the division uses in-house developments in addition to systems from software partners. For further information please see: http://www.siemens.com/smartgrid
Reference Number: ICSG201408051e
Tel: +49 (911) 433-2653
Dietrich Biester | Siemens Infrastructure & Cities
Electromagnetic water cloak eliminates drag and wake
12.12.2017 | Duke University
Two holograms in one surface
12.12.2017 | California Institute of Technology
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
14.12.2017 | Health and Medicine
14.12.2017 | Physics and Astronomy
14.12.2017 | Life Sciences