Study on the Improved Transformer Protection Scheme Based on The OCT

2006 ◽  
Author(s):  
Xu Yan ◽  
Liu Qing ◽  
Wang Zengping
Keyword(s):  
Transformer Protection ◽  
Protection Scheme

scholarly journals Design of transformer protection scheme for DC system

2020 ◽  
Vol 512 ◽  
pp. 012159
Author(s):  
Zhang Hongyue ◽  
Deng Maojun ◽  
Yu Haobo ◽  
Liu Zhiwen
Keyword(s):  
Transformer Protection ◽  
Dc System ◽  
Protection Scheme

scholarly journals Intelligent Protection of VSD Transformers

2020 ◽  
Vol 6 (4) ◽  
Author(s):  
Martin Brůha ◽  
Tore Nilsen
Keyword(s):  
Power Transformers ◽  
Design Practice ◽  
Variable Speed ◽  
Variable Speed Drives ◽  
Good Design ◽  
Transformer Protection ◽  
Protection Scheme ◽  
Harmonic Content ◽  
Input Transformer ◽  
Sinusoidal Current

Variable Speed Drives (VSD) protect themselves as well as the driven motors. In contrast, the isolation input transformer typically requires its dedicated protection. Unlike distribution and power transformers, the protection of VSD duty transformers need to consider several additional aspects, such as non-sinusoidal current with harmonic content, multi-winding design, phase-shifted converter windings etc. This paper aims to explain the challenges related to protection of VSD transformers. A guideline for reliable transformer protection based on good design practice is proposed. Finally the possibility to integrate the transformer protection into the VSD protection scheme is being explored.

A suggested differential protection scheme for power transformer

2014 ◽  
Vol 5 (2) ◽  
pp. 91-103 ◽  
Author(s):  
E. Ahmed ◽  
R. El-Sehiemy
Keyword(s):  
High Speed ◽  
Power Transformer ◽  
Normal Operation ◽  
Power Differential ◽  
Transformer Protection ◽  
Protection Scheme ◽  
Wide Range ◽  
Inrush Currents ◽  
Differential Scheme ◽  
External Faults

This paper integrates a Real Power Differential Scheme (RPDS) for power transformer protection. The suggested RPDS for power transformer computes the active power loci during normal operation, switching, normal, and internal, involves turn to turn, and external faults at varied load angles. The proposed RPDS concept is based on monitoring and comparing the transformers primary and secondary active and reactive powers. The dynamic response of the proposed RPDS is tested 300 MVA, 220/66 kV, Y/Δ transformer. Furthermore, the suggested scheme is simulated with the use of Matlab/Simulink then tested for various fault and switching conditions. Moreover, the RPDS is checked for inter turn fault conditions at primary and secondary sides. The evaluation of the suggested scheme confirms the superiority of the proposed scheme to distinguish internal and external faults as well as magnetizing inrush currents with good selectivity, high speed, sensitivity, stability limits and high accuracy response of the power differential scheme. Finally, the suggested scheme is able to detect correctly the turn to turn faults for wide range of fault resistances but fails at very low values.

scholarly journals Phase Shifting Transformer Electromagnetic Model Dedicated for Power System Protection Testing in a Transient Condition

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 627
Author(s):  
Tomasz Bednarczyk ◽  
Mateusz Szablicki ◽  
Adrian Halinka ◽  
Piotr Rzepka ◽  
Paweł Sowa
Keyword(s):  
Power System ◽  
Theoretical Background ◽  
Model Verification ◽  
Phase Shifting ◽  
Voltage Source ◽  
Transient Condition ◽  
Power System Protection ◽  
Transformer Protection ◽  
Protection Scheme ◽  
System Protection

Complex phase shifting transformer protection scheme and complexity of the object itself created a need to use simulation programs for their analysis. Often phase shifting transformer (PST) are modeled as a simplified series impedance and quadrature voltage source which cannot be used for power system protection analysis, especially in a transient condition. Therefore, the procedure of building realistic PST model was presented by using available transformer models with calculation of their parameters including interconnections between units. Paper consist calculations based on case study with symmetrical dual-core PST example. Additionally, theoretical background of PST principle, operation, and their impact of power system protection were introduced with numerus examples of PST model verification.

An Instantaneous Measurement Based Transformer Protection Scheme

2011 ◽  
Vol 383-390 ◽  
pp. 5188-5192
Author(s):  
B. Gu ◽  
J.C. Tan
Keyword(s):  
Reactive Power ◽  
Forward Direction ◽  
Iec 61850 ◽  
Extensive Simulation ◽  
Transformer Protection ◽  
Protection Scheme ◽  
Transformer Fault

A transformer protection scheme using fault component computed from instantaneous measurement values is proposed in this paper. The algorithm utilizes reactive power directional elements computed from the received IEC 61850-9-2 sampled values, and uses the ratio of active and reactive currents to determine an inrush condition. A transformer fault is declaimed if the directional elements from all transformer terminals seen the fault in its forward direction. Extensive simulation tests show that the proposed algorithm is sensitive to detecting faults, and is able to distinguish faults internal or external to the protected transformer zone, and to discriminate a fault from inrush conditions.

Sign in / Sign up

Export Citation Format

Share Document