Disposition and Settings of Transformer Relay Protection in UHVAC System

doi:10.3969/j.issn.1000-7229.2015.08.004

Abstract

Abstract:

Based on the operating experience of UHV transmission lines built in China, this paper studied the features of UHV transformer, the identification scheme for inrush current, the disposition and setting of relay protection for main transformer and voltage regulation compensation. Specific disposition schemes for both main protection and backup protection of each set of UHV transformer protection were proposed, also the function and range of each differential protection were defined to make sure that this protection scheme could reliably act on various types of failures happened in transformer. And then, the coordinate setting proposals were given and the feasibility of this proposed protection scheme had been proved by experiments on typical faults. The scheme has been successfully applied in 1 000 kV transformer protection in East China, which provides important references for the design of transformer relay protection in other UHVAC projects.

Key words: UHV, transformer, relay protection, setting calculation

CLC Number:

TM 423

LI Jiyuan, NI Laqin, LI Sha, QIU Yuting, ZHOU Hao. Disposition and Settings of Transformer Relay Protection in UHVAC System[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(8): 22-28.

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