Transformer Differential Protection Using Process Bus According to IEC 61850-9-2 and Non-Conventional Instrument Transformers

2015 ◽  
Vol 799-800 ◽  
pp. 1311-1315
Author(s):  
G. Igarashi ◽  
J.C. Santos
Keyword(s):  
Time Synchronization ◽  
Power Transformers ◽  
Response Analysis ◽  
Differential Protection ◽  
Iec 61850 ◽  
Instrument Transformers ◽  
Synchronization Signal ◽  
Conventional Instrument ◽  
Transformer Differential Protection

Our aim is to show some impacts on the differential protection of power transformers when using Non-Conventional Instrument Transformers associated with the IEC 61850-9-2 process bus. Described herein are a model for simulating the samples in the process bus, a proposed algorithm for differential protection of power transformers adapted from conventional differential relays so that it works according to the IEC 61850-9-2 standard, and a response analysis of the protection algorithm with the loss of the time synchronization signal in the process bus. Suggestions on parameters to be followed for safer operation of the process bus in these circumstances are also offered.

scholarly journals IEC 61850-Based Centralized Busbar Differential Protection with Data Desynchronization Compensation

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 967 ◽  
Author(s):  
Myeong-Hoon Song ◽  
Sang-Hee Kang ◽  
Nam-Ho Lee ◽  
Soon-Ryul Nam
Keyword(s):  
Time Synchronization ◽  
Interpolation Polynomial ◽  
Differential Protection ◽  
Iec 61850 ◽  
Synchronization Errors ◽  
Protection Scheme ◽  
Evaluation Module ◽  
Real Time Digital Simulator ◽  
Intelligent Electronic Devices ◽  
Differential Current

This paper proposes an IEC 61850-based centralized busbar differential protection scheme, in which data desynchronization between intelligent electronic devices (IEDs) leads to differential current errors. As the differential current errors could result in erroneous operation of the centralized busbar differential protection, data desynchronization should be compensated for. The main causes of data desynchronization are subdivided into measurement timing and time synchronization errors. In this paper, the first-order Lagrange interpolation polynomial is used to compensate for measurement timing errors and the voltage angle differences between IEDs are used to compensate for time synchronization errors. The centralized busbar differential protection is tested using a real-time digital simulator and IEC 61850-based IEDs, which are implemented with the MMS-EASE Lite library and Smart Grid Infrastructure Evaluation Module. The test results show that the data desynchronization compensation can significantly reduce differential current errors, and thus prevent erroneous operation of the IEC 61850-based centralized busbar differential protection.

System-Level Tests of Transformer Differential Protection Using an IEC 61850 Process Bus

2014 ◽  
Vol 29 (3) ◽  
pp. 1382-1389 ◽  
Author(s):  
David M. E. Ingram ◽  
Pascal Schaub ◽  
Richard R. Taylor ◽  
Duncan A. Campbell
Keyword(s):  
System Level ◽  
Differential Protection ◽  
Iec 61850 ◽  
Transformer Differential Protection

scholarly journals Performance of current transformer operate under harmonic condition and their effects on transformer differential protection

2018 ◽  
Vol 159 ◽  
pp. 02075
Author(s):  
Indra Nisja
Keyword(s):  
Power Transformer ◽  
Harmonic Distortion ◽  
Current Transformer ◽  
Power Transformers ◽  
Actual Condition ◽  
Differential Protection ◽  
Nonlinear Load ◽  
Primary Power ◽  
Transformer Differential Protection ◽  
Secondary Power

This paper focused to determine the performance of Current Transformer (CT) operates under harmonics condition and their effects on transformer differential protection. A laboratory test has been implemented to determine the error produced by both CT and power transformer when operating under harmonic condition. The test was performing with the actual condition, where the power transformer is connected to an adjusted nonlinear load, so that the test can be conducted with several levels of total harmonic distortion current (THDi). The results shows, for THDi ranging from 16.70% to 40.88% the maximum errors occurred on CT at secondary power transformers is 27.21% and CT at primary power transformers is 8.12%. This error resulted in differential current flow 0.17A and relay trip without any fault. In this study it was found that the relays started to operate incorrectly on THDi 31.5%.

A power transformer differential protection based onsupport vector machine and wavelet transform

2021 ◽  
Vol 197 ◽  
pp. 107297
Author(s):  
Lucas D. Simões ◽  
Hagi J.D. Costa ◽  
Matheus N.O. Aires ◽  
Rodrigo P. Medeiros ◽  
Flavio B. Costa ◽  
...  
Keyword(s):  
Wavelet Transform ◽  
Power Transformer ◽  
Differential Protection ◽  
Transformer Differential Protection

scholarly journals Temperature Distribution in the Insulation System of Condenser-Type HV Bushing—Its Effect on Dielectric Response in the Frequency Domain

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 4016
Author(s):  
Krzysztof Walczak ◽  
Jaroslaw Gielniak
Keyword(s):  
Temperature Distribution ◽  
Working Conditions ◽  
Dielectric Response ◽  
Power Transformers ◽  
Response Analysis ◽  
Insulation System ◽  
Large Power ◽  
Catastrophic Failures ◽  
Significant Temperature ◽  
Specific Construction

HV bushings are an important part of the equipment of large power transformers, responsible for their many serious (including catastrophic) failures. Their proper exploitation needs to apply correct and reliable diagnostics, e.g., the use of dielectric response methods, that take into account their specific construction and working conditions. In this article, based on laboratory tests carried out on a real bushing, it has been shown that the significant temperature distribution within its core significantly affects the shape of the dielectric response of its insulation; therefore, the approach to its modeling should be changed. Hence, a new method for interpreting the results, using the so-called the 2XY model, is proposed. Subsequently, based on the measurements made on the insulators in operation, a new modeling method was verified. In conclusion, it can be stated that the 2XY model significantly improves the reliability of the dielectric response analysis, which should be confirmed in the future by tests on withdrawn and revised insulators.

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