The world’s first fast-switching variable impedance transformer passed the audit

The project was jointly developed by Shandong Electric Power Equipment Co., Ltd. and Shandong Electric Power Equipment Co., Ltd., Ningxia Electric Power Research Institute, and State Grid Electric Power Research Institute Wuhan Nanrui Company. For the first time, it realized intelligent and rapid adjustment of transformer short-circuit impedance during operation. The company has made another major breakthrough in the field of transformer technology innovation and marks Shandong Electrical Engineering taking a new step in the development, design, and manufacturing of new transformers, and is at the forefront of the industry.

The development of this transformer has for the first time integrated the design of the traditional external current limiting reactor device and the transformer body. The innovative design of the transformer body and the external fast switching device was designed to achieve a reliable connection between the body insulating oil and the switch SF6 gas. For the first time, a novel connection structure of series-connected current-limiting reactor, transformer body, and on-load switch is proposed to realize adaptive adjustment and switching of high-impedance state under normal impedance state and short-circuit condition.

A series of technological innovations have greatly improved the technological advancement and quality reliability of products, and fully embody the technical background of Shandong Electrician Electric in the research and development of new products. The successful development of this product is of great significance for improving the level of intelligence in transformer products, enriching product categories, enhancing overall technical strength and market competitiveness of products.

There are two ways in which traditional transformers can improve short-circuit impulse withstand capability, and they all have certain limitations. First, the use of high-impedance transformers, which are bulky and have high losses, cannot meet the energy-saving requirements; the second is external access current limiting devices. Its large area, difficulty in maintenance and renovation, and high economic costs.

Variable impedance transformer through integrated structure design, fast switching device switching to achieve adaptive impedance adjustment, reduce the impedance during normal operation, reduce its own loss, short-circuit through the impedance increase, reduce the impact of short-circuit current transformer. In this way, the ability of the transformer to withstand short-circuit shocks is improved, and at the same time, economy and convenience are both taken into consideration, and the reliability of the power supply is effectively improved.

(Original title: The world's first fast-switching variable impedance transformer was successfully developed)