Abstract
Thyristor assisted arc extinguishing hybrid on load tap changer has the advantages of both mechanical switch and thyristor switch. It has strong ability to withstand overload, over-current and overvoltage, high reliability, small maintenance workload and frequent voltage regulation operation. It is a promising on load tap changer of transformer. This paper introduces the principle of passive trigger of thyristor module, gives the switching principle and process of thyristor assisted arc extinguishing hybrid on load tap changer, and analyses the characteristics of hybrid on load tap changer.
Highlights
The thyristor assisted arc extinguishing hybrid on load tap changer retains the tap selector and switching switch of the mechanical on load tap changer, and the reverse parallel thyristor is added in the transition circuit to assist the mechanical contact to complete the switching[1]
The reverse parallel thyristor exits the current carrying circuit, and the current carrying is completed by the mechanical contact
In order to realize the passive triggering of thyristor, this paper proposes an improved switching principle of thyristor assisted arc extinguishing hybrid on load tap changer, which combines the existing km type tap changer and hybrid on load tap changer switching principle[2]
Summary
The thyristor assisted arc extinguishing hybrid on load tap changer retains the tap selector and switching switch of the mechanical on load tap changer, and the reverse parallel thyristor is added in the transition circuit to assist the mechanical contact to complete the switching[1]. In order to realize the passive triggering of thyristor, this paper proposes an improved switching principle of thyristor assisted arc extinguishing hybrid on load tap changer, which combines the existing km type tap changer and hybrid on load tap changer switching principle[2] This scheme adopts three groups of basic thyristor circuits, which can truly realize the passive trigger and exit mechanism of thyristor, and make full use of the existing km type on load tap changer Other parts of the switch have the advantages of low cost and good expansibility
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