The emergence of electronic transformers has been hailed as a revolution in the manufacturing of high-voltage electrical appliances in the early 2000s. Its digital output and networked wiring make the power grid safer, more environmentally friendly, and more conducive to the intelligence of the primary equipment and even the entire transmission and distribution system. Compared with traditional transformers, electronic transformers have the following characteristics: small signal transmission instead of high power output, miniaturization and low power of transformers can reduce the weight of tens of kilograms or even tons to a few kilograms. 代替油、气绝缘。 Optically isolated plastic tube float flowmeter replaces oil and gas insulation. Independent high-voltage transformers use optical fiber digital connections once and twice. Optical isolation replaces complex and expensive oil and gas insulation systems. This is a revolutionary change. The higher the voltage, the higher the cost-effectiveness of the transformer. Digital output replaces analog output, which is convenient for subsequent network connection and intelligent processing. It adopts optical fiber transmission and has stronger ability to resist electromagnetic interference. Network data sharing replaces multi-winding parallel wiring. Single-point measurement data of electronic transformers can be transmitted via Industrial Ethernet, so they are shared, and a large number of parallel cables can be omitted at the power station.
统计，我国目前大约有上百个单位从事新型电子式互感器的试探性研发，初步形成供货能力的大约有十家左右，门类较为齐全，可全面供货的目前已经有3～5家。 Statistics of plastic tube float flowmeters . Currently, there are about hundreds of units in China that are engaged in the tentative research and development of new electronic transformers. The initial supply capacity is about ten, and the categories are relatively complete. Three to five. The products involve different varieties such as 10 ～ 800 kV, current, voltage, free-standing type and combined electrical type. Since 2004, active electronic transformers have entered the market before optical transformers. The high-voltage side of active electronic transformers converts current signals into digital signals and transmits them to ground potential through optical fibers. Like optical sensing solutions, Optical isolation between high and low voltages, coupled with industrial mass production, has become the dominant type of transformer. During the same period, China developed a more practical "self-excitation source" technology, which has actively transformed into a "quasi-passive" structure. This solution greatly simplifies the transformer and fundamentally improves reliability and life cycle. Soon, a kind of "equal-potential cavity" partial pressure structure suitable for electronic low-power partial pressure appeared in China. It has high insulation safety plastic tube float flow meter and measurement accuracy index, so it can replace the traditional oil and gas reliance. Insulated transformer. This technology is particularly suitable for the dry type of high-voltage and ultra-high-voltage voltage divider structures. It is a new type of electronic voltage transformer that has grown out of China. In order to overcome the measurement performance susceptible to temperature and vibration stress, the optical solution has been improved from a ring magneto-optical glass to a fiber-optic sensor, making the optical solution a new technical platform, closer to the practical requirements. A few types of electronic transformers known as fiber optics have been tried out, and they need to further overcome the problems of complex structure and high cost.
Electronic transformers have changed the original assembly and application methods. For example, microelectronic devices have been moved near high-voltage lines, isolated knife gates, circuit breakers and other strong interference sources in outdoor environments. They must withstand harsh weather conditions and irregular strong electromagnetic interference. Tests, so the main problems faced in the current research and development and application of electronic transformers are: electromagnetic interference protection, communication error control, reliable power supply methods, and adapting to outdoor environments. If improper measures are taken, signal failure, protection misjudgment, and corrosion and aging will easily occur . To solve these problems, we need to improve the test and inspection standards as soon as possible to promote the focus of the next development of electronic transformers to be highly reliable and stable. Passive sensing: Due to the technical advantages of the passive sensing method, the independent ECT sensing components will tend to be passive. This includes active sensors that will achieve self-powering by moving away from dependence on external sources and moving towards quasi-nothing. As a result, the average life cycle of electronic transformers will reach more than 10 years. The optical sensor improves the measurement performance, simplifies the system structure, reduces the cost, and becomes practical. 组合电器、隔离刀等组合电器中，减少占地，降低造价，还可以通过功能复用促进一次电器本身的小型化和智能化。 Combined structure: Utilizing the advantages of electronic micropower and miniaturization, the transformers are combined in components as transformers, fully-enclosed plastic tube float flowmeter combination appliances, isolation knives and other combination appliances to reduce land occupation and cost. Through the reuse of functions, the miniaturization and intelligence of the primary electrical appliances themselves are promoted. Various schemes will be combined with each other while taking advantage of each other. In addition to various independent and closed current-voltage combination transformers, LPCT / ROG-CT and optics are expected to appear in the next few years. Combination version of current transformer.