Two & Three Winding Transformers and Circulating Fault Currents - PowerPoint PPT Presentation

Two & Three Winding Transformers and Circulating Fault Currents By: Abdur Rehman 2019 Hands on Relay School PSE.com // GeneralPAC.com 1

Purpose at the 2019 HRS • Intention is to share our knowledge and passion for Power Systems Engineering & Protection • NOT intended to replace any lecture… • Intention is to supplement other lectures PSE.com // GeneralPAC.com

Assumed Knowledge • Basic understanding of symmetrical components - Phase & Ground faults • Working knowledge of Transformer Phase Shifts • Fundamental understanding of power systems PSE.com // GeneralPAC.com

Outcomes & Takeaways • Better understanding of transformers under faulted conditions • Practical application of sequence network diagrams • Visual display of circulating sequence currents for 2 & 3 winding transformers • Introduction to help better understand the handouts PSE.com // GeneralPAC.com

Outcomes & Takeaways • Sit back… Relax… and Enjoy the show. • The step-by-step details are in the accompanying PDF for your review… Presentation = Introduction • Make sure to send me an email for the accompanying PDF document, presentation, and videos… abdur.rehman@pse.com PSE.com // GeneralPAC.com

Video Tutorial available on Youtube • Search for “General PAC” or visit generalpac.com • Topic “Fault Analysis in Power System” PSE.com // GeneralPAC.com

D AB Y-G 2 Winding Transformer 30 MVA 115 kV 13.8 kV MVA SC = 600 MVA Example Y AB Line A Line a Line B Line b Line C Line c PSE.com // GeneralPAC.com

PSE.com // GeneralPAC.com

6 Step Process to calculate fault current Step 1: Convert the system quantities into per-unit quantities Step 2: Identify the type of fault Step 3: Draw the unfaulted sequence networks Step 4: Interconnect the faulted sequence networks Step 5: Hand Calculate Sequence Currents & Voltages Step 6: Convert to Phase currents & voltages PSE.com // GeneralPAC.com

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Sequence Components Source Generator Transformer System 115kV 13.8kV (1) (1) Z G Z T (1) (1) Z G Z T j0.10 j0.05 j0.05 j0.10 Positive + = 1pu 1pu Sequence 115kV 13.8kV (2) (2) Z G Z T (2) (2) Z G Z T Negative j0.05 j0.10 j0.05 j0.10 + = Sequence 115kV Open Open 13.8kV (0) (0) Z G (0) (0) Z T Z G Z T Zero j0.05 j0.10 j0.05 j0.10 = + Sequence PSE.com // GeneralPAC.com

3PH Fault 1LG Fault 115kV 13.8kV (1) Z G (1) Z T 115kV 13.8kV (1) Z G (1) Z T 1 PU 1 pu 115kV 13.8kV (2) Z G (2) Z T Open 115kV 13.8kV (0) Z G (0) Z T PSE.com // GeneralPAC.com

3 Phase Fault Big Picture 1 of 5 PSE.com // GeneralPAC.com

3 Phase Fault Big Picture Comparison 1004|-60 8367|-90 8367|150 1004|180 8367| 30 1004| 60 PSE.com // GeneralPAC.com

1LG Fault Big Picture PSE.com // GeneralPAC.com

Step #4 PSE.com // GeneralPAC.com

Step #5 PSE.com // GeneralPAC.com

1LG Fault Big Picture Comparison PSE.com // GeneralPAC.com

LL Fault Big Picture 1 of 1 PSE.com // GeneralPAC.com

2LG Fault Big Picture 1 of 1 PSE.com // GeneralPAC.com

3 Winding Transformer Example Y-D-Y G 30 MVA 115 kV 13.8 kV MVA SC = 600 MVA PSE.com // GeneralPAC.com

Sequence Components Transformer System Generator (1)) 115kV 13.8kV (1) (1) (1) (1) Z H Z M Z H Z M Z G (1) Z G (1) (1) Z L Z L Positive + = 1pu 1pu Sequence T T (2) (2) Z H Z M (2) 115kV 13.8kV (2) (2) Z H Z M (2) Z G Z G Negative (2) Z L (2) + Z L = Sequence T T 115kV Open 13.8kV 13.8kV (0) (0) (0) Z G Z T Z M Open (0) (0) Z H Z M (0) Z G (0) = Z L (0) Z L Zero + Sequence T T PSE.com // GeneralPAC.com

3 Phase Fault Big Picture 1 of 1 PSE.com // GeneralPAC.com

1LG Fault Big Picture 1 of 1 PSE.com // GeneralPAC.com

LL Fault Big Picture 1 of 1 PSE.com // GeneralPAC.com

Questions? Abdur.rehman@pse.com Generalpac.com PSE.com // GeneralPAC.com

Two & Three Winding Transformers and Circulating Fault Currents - PowerPoint PPT Presentation

Two & Three Winding Transformers and Circulating Fault Currents By: Abdur Rehman 2019 Hands on Relay School PSE.com // GeneralPAC.com 1 Purpose at the 2019 HRS Intention is to share our knowledge and passion for Power Systems

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Two & Three Winding Transformers and Circulating Fault Currents - PowerPoint PPT Presentation

Two & Three Winding Transformers and Circulating Fault Currents By: Abdur Rehman 2019 Hands on Relay School PSE.com // GeneralPAC.com 1 Purpose at the 2019 HRS Intention is to share our knowledge and passion for Power Systems

An Intelligent Approach using SVM to Enhance Turn-to-Turn Fault Detection in Power Transformers

Transformers are RNNs: Fast Autoregressive Transformers with Linear Attention Angelos

QUALITY PLAN POWER TRANSFORMERS MANUFACTURING CUSTOMER: SIDOR C.A. PROJECT: POWER TRANSFORMERS

Lecture 10: Fault Tolerance Fault Tolerant Concurrent Computing The main principles of fault

Status of CIGRE JWG A2/B4-28 HVDC Converter Transformers HVDC Converter Transformers Ugo Piovan

Task Force on Partial Discharge Testing of Class I Power Transformers IEEE/PES Transformers

Commencing Development of Just Approved New Guide on Moisture in Transformers and Reactors

Ci Circulating t g tumor or D DNA e A expos osure i in p peripheral b blood ood using a

2 Fault Isolation &amp; Restoration Manual Fault Isolation &amp; Restoration The

Overview Introduction and basic concept ECE 753: FAULT-TOLERANT Fault model and fault

The Long and Winding Road The Long and Winding Road Christmas Edition Martin Luther on the

Reliability, Quality Since 1921 Rok 2018 Organization Chart International BEZ Group 100 % 100

DISTRIBUTION TRANSFORMERS PRAKASH BACHANI Scientist E (Electrotechnical) BUREAU OF INDIAN

CO 2 and SO 2 co-capture in a circulating fluidized bed carbonator reactor of CaO&quot; B.

Counting lattice walks by winding angle Sminaire de combinatoire Philippe Flajolet Andrew Elvey

Fault Modeling 1 Why Fault Models? Actual number of physical defects in a circuit are too

Scikit-learn's Transformers - v0.20 and beyond - Tom Dupr la Tour - PyParis 14/11/2018 1 / 30

Active fault level management Introducing the Fault Current Limiting service 1 Fluctuating

JUST ONE FAULT Persistent Fault Analysis on Block Ciphers Shivam Bhasin Temasek Labs @ NTU ASK

Libraries and Tools Transformers, AllenNLP LING575 Analyzing Neural Language Models Shane

Circu.Pre.Can Identification of CIRCUlating miRNAs PREdictive of CANcer development in Kidney

DISTRIBUTION TRANSFORMERS BUREAU OF INDIAN STANDARDS BHOPAL BIS Act WTO Principle on

Winding- -up of the assistance up of the assistance Winding 16 October 2008 16 October 2008

BSc Project What kinds of fault we may confront in a control loop? Fault Detection &amp;

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BSc Project What kinds of fault we may confront in a control loop? Fault Detection &