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Transformer Protection

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An short PPT on types of basic protections employed in an power transformer.

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The power transformer is an electrical equipment that needs continuous monitoring and fast protection since it is very expensive and essential element for power system to perform effectively. Various methods for the protection are available. Most of the methods should be known for the protection of the transformer before practically protecting the same. Here a review is presented for various methods available for the protection of transformer. The most common protection technique used is the percentage differential logic, which provides discrimination between different operating conditions and internal fault. Some condition as, inrush current and CT saturation can cause mis-operation of differential protection. Few methods to solve this problem are also reviewed. Dissolved gas analysis (DGA) of power transformer is an investigative tool to monitor its health and to detect failures by recognizing anomalous patterns of DGA concentrations is also discussed. Some additional methods for ...

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Abstract: In this paper it will be analyzed the possible achievement of a numerical protection with PIC 16F84 microcontroller for an electrical transformer. ... Key words: numeric protection, PIC 16F84, electrical transformer. ... The main condition imposed to the power ...

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Transformers are a vital part of the transmission and distribution system. Monitoring transformers for problems before they occur can prevent faults that are costly to repair and result in a loss of service. Transformers being the essential part of power transmission system are expensive, as is the cost of power interruptions. Because of the cost of scheduled and unscheduled maintenance, especially at remote sites, the utility industry has begun investing in instrumentation and monitoring of transformer. This paper describes the design and implementation of “Transformer Protection and Parameters Monitoring”. The aim of this paper is to provide an alternative, effective, efficient and more reliable method of protecting fault from power transformer which may arose as a result of overload, high temperature or a high input voltage. To safeguard the damage of the transformer with the aid and help of microcontroller we monitor and control the entire circuitry. Thereafter regarding the mo...

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transformer protection

Transformer PROTECTION

Jul 20, 2014

830 likes | 4.38k Views

Transformer PROTECTION. 7.4. Differential Relays . Figure 10: Differential protection for a generator phase winding. Transformer Protection. Problem 1: For a 45 MVA, 11 kV/66 kV, Y-∆ transformer design a percentage differential scheme. Use 125% overloading to find CT ratios.

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Presentation Transcript

7.4. Differential Relays Figure 10: Differential protection for a generator phase winding.

Transformer Protection • Problem 1: For a 45 MVA, 11 kV/66 kV, Y-∆ transformer design a percentage differential scheme. Use 125% overloading to find CT ratios. • What is the minmumrecommended percentage bias?

Transformer Protection Example

Magnetizing Inrush

Harmonic Restraint • Flow Chart

Percentage Bias Differential Relay with Harmonic Restraint

Inter-turn Faults in Transformers

Volts/Hertz Relay Characteristics

Protection During an Earth Fault

Condition for a fault in middle of phase C on 13.2 kV Side

Problem 2:Connection Diagram

Differential Protection for a Generator Connected in Star with four terminals

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"The transformer is an essential part of the transmission and appropriation framework. The point of creating, transformer security structure is to oversee in such a manner, that we are utilizing microcontroller and IoT to give programmed security and continuous observing to the transformer. There are numerous flaws happening on a transformer, for example, over voltage, under voltage, extraordinary temperature, and so on. The unit is structured so that it will be good with a wide range of dispersion and force transformer of any appraising. These pack presented sensor, microcontroller, IoT module. To shield the transformer from any cataclysmic disappointment. Also, the framework shows continuous information on the PC at the working station. This framework can use for identifying issues before they happen because of this we can forestall flaws that are expensive to fix and bring about lost assistance. We give an imaginative structure to build up a framework for checking the voltage, current, temperature, and oil parameters of a transformer in a substation or in the field. The proposed structure is produced for the client to effectively perceive the transformer on the off chance that it is endured by any issues and what are the current online parameters. This framework will assist the transformers with operating easily and distinguish issues before any disastrous disappointment. P. A. Werulkar | S. S. Chopade | S. V. Pole ""Smart Transformer Protection Unit"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-2 , February 2020, URL: https://www.ijtsrd.com/papers/ijtsrd29951.pdf Paper Url : https://www.ijtsrd.com/engineering/electrical-engineering/29951/smart-transformer-protection-unit/p-a-werulkar"

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Presentation Transformer Protection

powerpoint presentation on transformer protection

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ECE 472 - POWER SYSTEMS II  Transformer Protection Homework #4

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DIGITAL DIFFERENTIAL RELAYS FOR TRANSFORMER PROTECTION USING WALSH SERIES AND LEAST SQUARES ESTIMATORS - PowerPoint PPT Presentation

powerpoint presentation on transformer protection

DIGITAL DIFFERENTIAL RELAYS FOR TRANSFORMER PROTECTION USING WALSH SERIES AND LEAST SQUARES ESTIMATORS

Digital differential relays for transformer protection using walsh series and least squares estimators ali reza fereidunian*, mansooreh zangiabadi*, – powerpoint ppt presentation.

  • Ali Reza FEREIDUNIAN,
  • Mansooreh ZANGIABADI,
  • Majid SANAYE-PASAND,
  • Gholam POURNAGHI
  • ECE Dep., Faculty of Engg., University of Tehran,Tehran, IRAN
  • Kerman Regional Electric Company (KREC), Kerman, IRAN
  • The fundamental principle of differential protection sum of the currents entering a device through normal paths should be zero Kirchhoff's Current Law (KCL).
  • If the currents enter (or leave) through abnormal paths, namely fault paths, then the sum of the currents through normal paths will not be zero.
  • inrush current,
  • CT inaccuracy,
  • CT saturation,
  • over-excitation.
  • These problems produce fault trips (fault alarm when there isnt any trip) or no alarm when there is a trip in transformer protection function
  • Current Sensor (CT) converts large amounts of current to small amounts
  • Data Acquisition System gathering data
  • Filter anti aliasing
  • Pre-processor scaling and so on
  • Estimator estimating peak phase
  • Decision Maker (Classifier) fault/no fault
  • FOR ESTIMATING PEAK AND PHASE OF INPUT WAVE.
  • FA-1W where
  • F F0 F1 F2 F3 F4 F5 F6 F7 F8
  • 12 point window (for half cycle estimation) or
  • 24 points (for full cycle estimation)
  • 24 sample/cycle sampling system
  • A significant second harmonic
  • Inrush Current Pattern Recognition
  • Real recorded data
  • Transformer internal fault,
  • Transformer external fault,
  • Transformer inrush current
  • A digital differential relay for transformer protection was presented.
  • Two estimator systems Walsh series and least squares algorithms were formulated and designed.
  • The differential protection decision maker subsystem was introduced.
  • Current signals harmonic components and second harmonic restraint concept were utilized in decision maker subsystem.
  • In a practical case study, the designed relay performance was tested under three real circumstances external fault, internal fault and inrush current.
  • It was shown -using graphs and illustrations- that the presented relay issues trip alarm for transformer internal fault, and does not issue trip alarm for external fault and inrush current situations.
  • It were seen that both estimation algorithms perform their job correctly.
  • Walsh series acts better than least squares algorithm, especially on second harmonic estimation.
  • An anti alias filter (for example a Butterworth one) will improve response of the estimator.

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    26% Source: IEEE Std. C37.91-2008, IEEE Guide for Protecting Power Transformers Transformer Protection Differential Protection Current Transformer Performance Through Fault Protection Mechanical Protection Design Considerations for Transformer Differential Protection CT ratio and CT voltage class selection CT connections

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    The power transformer is an electrical equipment that needs continuous monitoring and fast protection since it is very expensive and essential element for power system to perform effectively. Various methods for the protection are available.

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    Transformer Protection Application Guide This guide focuses primarily on application of protective relays for the protection of power transformers, with an emphasis on the most prevalent protection schemes and transformers. Principles are emphasized. Setting procedures are only discussed in a general nature in the material to follow.

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    -7 Transformer-Protection.ppt - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. Transformer protective relaying schemes must recognize the potential impact of a transformer failure. Selection criteria include experience for a minimum period of three years. Use microprocessor-based relays with features such as self-diagnostics.

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    Transformer Oil Role in Transformer Protection - Here we are writing an article to inform and to make aware about how does transformer oil plays a role in transformer protection. Transformer mainly depends on oil volume it contains. Therefore it is highly important to check transformer oil quality after regular intervals, so that if contamination is found in oil like grease, dissolved gas ...

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    PROTECTED ZONE HV LV R • Correct application of differential protection requires CT ratio and winding connections to match those of transformer. • CT secondary circuit should be a "replica" of primary system. • Consider : • (1) Difference in current magnitude • (2) Phase shift • (3) Zero sequence currents Biased Differential ...

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