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On the optical digital substation transformer

[Paper Keywords] digital optical transformer substation transformer composed of traditional-style passive active energy measurement [Abstract] of digital optical transformer substation working principle, structural characteristics and advantages of a simple analysis, and describes the applications of photovoltaic power transformer measurement of the impact. Digital substation is to information collection, transmission, processing, output process is completely digital substation. The station building with a unified communication network communication protocol, protection, monitoring, measurement, monitoring, remote, VQC and other systems, all using the same network to receive current, voltage and status information, each information sharing system. Since the station's first regular comprehensive collection of analog devices, analog signal transmission by cable to the protection devices, devices to process data after analog-digital conversion, and then through the digital network transmitted back online monitoring system. At the same time monitoring systems and protection devices for the control of a device to transmit analog signals through the cable to achieve its function. A collection of digital substation equipment information, is converted to digital in situ, through the cable upload protection devices, and then spread to the background monitoring system, monitoring systems and protection devices for the control of a device is through the optical transmission of digital signals to achieve its function. With the continuous development of power industry, increasing the grid voltage level, voltage, current measurement requirements are also rising, while the low-voltage transformers as the connection of a high voltage electrical equipment and also continuous improvement and development, advanced for measuring transformer which is an important indicator of whether or not that is the problem of insulation transformer. For the traditional electromagnetic transformer, because the insulation cost increases with the level of insulation growing exponentially, so the original air-insulated, oil-paper insulation, gas-insulated and insulated cascade high pressure equipment can not meet insulation requirements, At the same time there is the traditional transformer magnetic saturation, resulting in protection device malfunction or refuse to move, and ferromagnetic resonance, inflammable, explosive and dynamic range of small transformers and other shortcomings have been difficult to overcome the traditional difficulties. Thus, all for high-voltage, high current signal measurement methods have come into being, which, based on the principles of optics and electronics of measurement methods, after nearly three decades of development, become relatively more mature, one of the most promising kinds of measurement methods under high pressure. Optical output transformer means for small-voltage analog signal or digital signal current and voltage transformers. The analog output of the optical transformer still some inherent shortcomings of the traditional transformer, and now the development of high-voltage transformer is generally used with optical fiber output digital signals. CT appearance with the traditional optical transformer similar, but small size, light weight, mainly by the sensor head, backbone and fiber optic cable insulation consists of three parts. ① sensor head components are Luo Khodorkovsky coil, acquisition, A / D converter and generator light LED. Work by Lo Khodorkovsky coil changes from one transmission signal, after sampling collector, AD converter into a digital signal, the LED is converted to optical signals back to the main control room via fiber optic cable. Luo Khodorkovsky coils generally have protection, metering and measurement, energy coil, Luo Khodorkovsky is a hollow solenoid coil shape, no core, filled with non-crystalline materials, mainly play a supportive role. ② insulation pillar silicon rubber insulator, a fill, solid silicone, play a support role in insulation and fixed fiber optic cable. ③ data cable and power cable into cable, insulated from the sensor head through the pillars of the internal argument, the return of the main control room. ④ energy issues. Sensor head components of the power supply is one of the difficulties optical transformer. Sensing unit (acquisition, A / D converter and generator light LED) using the micro-power devices, power of 30 mW. Optical transformer can be divided into two types. One is to use magneto-optical effect and current-voltage electro-optic effect directly into optical signals, commonly known as passive; other is to use the principle of electromagnetic induction or the partial pressure of the current and voltage signals into a small voltage signal, and then a small voltage signals are converted to optical signal transmission to the secondary device,[link widoczny dla zalogowanych], commonly known as the active type. Passive due to poor stability and produce electronic circuits and complex problem, now mainly in the laboratory stage, to promote the use of take some time before. The difficulty is to provide active-type high-voltage power supply side needs work, but with the laser energy and pressure for a breakthrough in access to technology, has been fundamentally resolved. Photoelectric sensor head components Transformer There are two ways of energy sources. First, from the time taken to by the coil induces a current of energy to provide energy; when a current is too small to provide energy, the use of optical energy from the laser generator indoors on the delivery of energy through the fiber optic cable. Two ways to backup each other, automatic switching.