Abstract
Modeling and Detection of Turn-to-Turn Faults in Shunt Reactors
Highlights
The shunt reactors are generally parallel connected at both sides of the long overhead transmission lines or pipe-type cables [1], [2]
As a result, using such an approach with a fictitious winding makes it possible to develop an equivalent circuit, representing the shunt reactor for any location of turn-to-turn fault with a small number of turns involved [15]
The estimated zero-sequence reactance allows to determine whether the fault is within the zone or out-of-zone with respect to the shunt reactor terminals; it works like a directional element
Summary
The shunt reactors are generally parallel connected at both sides of the long overhead transmission lines or pipe-type cables [1], [2]. Three methods for detecting turn-to-turn faults based on zero-sequence reactance, negative-sequence reactance, and phase impedance are proposed They are very simple to implement and can be used for any type of shunt. The three-phase shunt reactor may be solidly grounded and directly connected to the line, or it may remain ungrounded and connected to a transformer tertiary winding (Fig. 1a, b) Both configurations were taken into account when analyzing turn-to-turn faults since the connection way affects the current fault level, symmetrical components flow, etc. As a result, using such an approach with a fictitious winding makes it possible to develop an equivalent circuit, representing the shunt reactor for any location of turn-to-turn fault with a small number of turns involved [15]. The resistance is comparable, or sometimes even much larger than the reactance [16], [17], [18]
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