Aug 12, 2025
In this paper, we present a new approach to protection of double-circuit transmission lines using modal transformation. The current differential principle is applied in the modal domain,
May 12, 2026
This paper presents a new protection algorithm for double circuit transmission lines using the sum of ratios of modal currents. Relay-operating characteristics is proposed using the complex ratio of
May 20, 2026
Abstract: This paper describes different cases of parallel transmission lines and analyzes some well known application problems associated with their protection.
Dec 04, 2025
Our focus will be on protection aspects on double circuit line and then we will see how a distance relay can be applied for such a transmission system protection.
May 13, 2026
Abstract—This paper summarizes the IEEE C37.234-2009 Guide for Protective Relay Applications to Power System Buses. In the Guide, concepts of power bus protection are discussed. Consideration
May 31, 2026
Using modern protective relays, better performance can be achieved on double-circuit lines. Particularly, during inter-circuit faults, it is possible to prevent tripping of both lines when synchronism still can be
Dec 09, 2025
Rules for protecting a network using overcurrent relays. Requirements for instrumentation (number and locations of instrument trans-formers) and switching apparatus (number and locations of circuit
Mar 06, 2026
Circuit symbols in diagrams Circuit symbols are used in circuit diagrams showing how a circuit is connected together. The actual layout of the components is
Jan 26, 2026
The protection without current and voltage transformers is suggested for double‐circuit transmission lines for the first time. It allows saving copper, steel, and high-voltage insulation in
Jan 04, 2026
However, modern relays have increased processing power that allows them to run dual high-performance schemes based on distance and line differential protection respectively thus giving the
May 05, 2026
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Mar 09, 2026
Double switching is a crucial safety engineering practice in railway signalling, wherein it is used to ensure that a single false feed of current to a relay is unlikely to cause a wrong-side failure. It is an
Jun 09, 2026
This presentation reviews the established principles and the advanced aspects of the selection and application of protective relays in the overall protection system, multifunctional numerical devices
Mar 21, 2026
The behavior of ground overcurrent protection on double circuit applications is also discussed in the paper. Finally, some advanced features of
Apr 30, 2026
Protection System Elements Protective relays Circuit breakers CTs and VTs (instrument transformers) Communications channels DC supply system
Dec 10, 2025
Ground fault protection for these systems is usually provided by residual protection, either calculated by relay or by external CT residual connection to IN input
Jul 10, 2026
Protective relays are tested through three methods bench, commissioning, and maintenance testing. Protective relays find application in fault detection in a circuit, electrical
Jun 04, 2026
The proposed protection scheme can be used when primary protection of double circuit line, based on transverse differential principle, becomes blocked due to permanent tripping of one
Nov 05, 2025
Adaptive distance protection of a double-circuit line Abstract: Due to changes in the power system, such as generator and line outages and changes in load and generation, the performance of
Jun 23, 2026
Testing of protection relays or schemes for double circuit or other parallel line configurations requires proper transient or steady-state simulation of the fault conditions that takes into consideration the
Sep 02, 2025
In this paper, a directional relaying algorithm for the protection of double circuit line with series capacitor is presented. The method uses four
Apr 20, 2026
Distance protection performance problems are in the focus due to the fact that they are the most commonly used protection type for parallel transmission lines. The behavior of ground
Jan 23, 2026
A more troublesome problem with double circuit lines is the possibility of back flash after a lightning strike producing an inter circuit fault. e.g. An AB-ground fault involving A-ph on one circuit
Mar 29, 2026
In this paper the distance protection of a double-circuit line under the SLG fault condition is formulated. To achieve correct operation, the relay does not only use the measured quantities of
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