35KV digital substation of a new generation of electronic structure, the current transformer, measuring and processing of voltage transformer and its signal to achieve full digital. The standard is IEC60044-8 (electronic current transformer), IEC60044-7 (electronic voltage transformer), IEC61850 (communication networks and systems in substations) protocol. Due to the adoption of the standard interface and the communication protocol, can realize multiple LED (intelligent electronic devices) interoperability, interoperability, to realize the seamless connection data acquisition and control in substation LAN.Optical fiber digital substation substation system according to new concept design, is a product of modern electronic technology and the combination of photovoltaic technology, it represents the development direction of the substation automation. Application of optical fiber digital substation, the substation construction is more simple, greatly enhance the safety performance, anti surge and lightning protection effect, data acquisition and transmission more quickly and accurately.
Efforts to build a digital network, vigorously promote in 35KV substation digital photoelectric technology, with the development trend of automation of electric current. For a long time, we always used transformer electromagnetic power type to provide an analog signal protection, control, measurement equipment. It is feasible and necessary in many years ago, when the station two equipment and meter need a power input PT voltage CT current and 100V -- generally need 5A driving electromagnetic relay protection and meter etc.. In recent years, 35KV automation of substation has developed by leaps and bounds, by a large number of microcomputer relay protection, electronic meter. In addition to the small current line selection, harmonic elimination device, control device also need to input small signal. Therefore, to the traditional CT, PT provides high voltage, large current signal in the corresponding electronic device before artificially attenuation and conversion, a current or voltage signal tens of milliamps or several volts, which not only increases the link, also lost data accuracy.
With the rapid development of optical technology, optical fiber communication technology, the use of electromagnetic transformer digital photoelectric transformer instead of the traditional, using optical fiber digital communication technology to replace the ordinary metal cable two simulated power transmission mode, using optical fiber digital communication network instead of the metal wire communication network, the protection and control digital optical interface device instead of protection and control device the traditional analog technology has matured. Optical fiber digital substation system has become a development direction of electric power automation technology the most energetic. It will bring revolutionary changes in electric power system measurement, protection and monitoring.
