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The increasing load, increasing level of penetration of renewable energy and limited investment in transmission infrastructure have significantly increased the need for a smart, dynamically controllable grid. The authors have previously proposed a power flow control device to maximize asset utilization, improve reliability, and reduce congestion. The proposed “power router” is realized by augmenting...
Power Voltage Transformers are units which are primarily used for auxiliary supply of substations. The main objective of this paper is to demonstrate that they can be used for other purposes as well, namely for rural electrification by serving as the main transformer in a compact substation. To support such unconventional grid topology, transformer in-service reliability has to be unconditionally...
As the most important equipment in substation, it is necessary to make power transformer intelligence firstly in smart grids construction. According to the basic specifications of intelligent machine, i.e., visualization condition, networking control and automation, this paper presents the overall framework of a developed intelligent system for an 110kV power transformer. The structural function definition,...
At Shinkansen substations in Japan that receive electric power from an extra-high voltage system, we have been using modified Woodbridge connected transformers for traction power supply since the inauguration of the Sanyo Shinkansen, which commenced commercial operations in March 1972. However, this transformer is of a rather complicated structure. Therefore, we studied a new type of transformer,...
Harmonics is an indication that occurs at power systems caused by a non linear load which will generate high frequency waves resulting from the multiplication of its fundamental waves. Transformer losses can be divided into losses with loads and zero load losses. Losses that are caused by harmonic current will cause an increase of copper losses and stray flux losses. Whereas harmonic voltage will...
Harmonics is a phenomenon that occurs at power systems caused by a non linear load. It would generate high frequency waves resulting from the multiplication of its fundamental waves. Transformer losses can be divided into losses with loads (load losses) and zero load losses (no load losses). Losses that are caused by harmonic current will cause an increase of copper losses and stray flux losses. Whereas...
Industrial substations for petro-chemical facilities must be reliable, easy to operate and easy to maintain, as well as have enough spare electrical capacity and spare space to handle all anticipated future growth needs. In many cases three winding power transformers offer an attractive alternative to the traditional two winding transformers without sacrificing reliability, operability, maintainability...
The high cost and the critical nature of power transformers in power substations makes it is very important to prevent failures and detect problems as early as possible. This presentation reviews the diagnostic and monitoring tests and equipment available to assess the condition of transformers and provide an early warning of potential failure.
Power transformers are usually very reliable and durable components of the power supply network. Unfortunately, when a fault occurs in a transformer, it can develop catastrophically and failures are usually very expensive, often resulting in the loss of what is the most expensive plant item in a substation [1]. In order to safeguard this valuable asset, various condition monitoring and diagnostic...
It is hardly necessary to stress the need for adequately protecting transformers serving industrial plant loads. Those responsible for this protection, however, could benefit from a review of the best known devices available for this purpose. Such devices are explored in terms of their contribution to overall transformer protection.
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