26MVA Transformer HV Over Current SEL 751A Calculations
26MVA Transformer HV Over Current SEL 751A Calculations
Published 5/2023
Created by Elite Engineering
MP4 | Video: h264, 1280x720 | Audio: AAC, 44.1 KHz, 2 Ch
Genre: eLearning | Language: English | Duration: 9 Lectures ( 1h 8m ) | Size: 480 MB
Setting Calculations of132 / 12kV and 20/26 MVA Power Transformer
What you'll learn
Basics of over current protection
Definite time and Inverse time over current function
Types of curves in Inverse time over current protection
Understand 26MVA transformer name plate
Basics of Single Line Diagram
Current Transformer
How to calculate full load current at HV & LV side
What is percentage impedance and how to calculate fault MVA & fault current at HV & LV
How to calculate transformer HV over current protection
Requirements
Basic understanding of protection
Description
Dear All,Overcurrent protection of a transformer is a type of protective measure that is implemented to prevent excessive current from flowing through the transformer, which can cause damage or even failure to the transformer and the connected equipment.Overcurrent protection is typically achieved through the use of protective relays that detect and respond to abnormal current levels. These relays are designed to sense the magnitude and duration of the current, and if it exceeds a pre-set threshold, they act to isolate the transformer from the power source by opening circuit breakers or other disconnecting devices.There are different types of overcurrent protection schemes that can be used for a transformer, including primary and secondary protection, time-overcurrent protection, instantaneous overcurrent protection, and directional overcurrent protection. The type of protection used depends on the specific application and the level of protection required.Overall, overcurrent protection is an essential feature for ensuring the safe and reliable operation of transformers and their connected equipment, and it plays a critical role in preventing damage or failure due to excessive current.Transformer over current protection for the larger unit is used as backup protection, main protection is transformer differential protection that has zero time delay. In case of differential protection fail, backup over current protection will operate.In this course, the relay setting of a real 26MVA transformer that is installed and commissioned already. So these are actual relay settings. In this training, the following topics are covered,Basics of over-current protectionTypes of over-current protectionDefinite time and inverse time over current protection Types of curves of over-current protectionHow to calculate the operating time of the relay in case of a faultWhat are pickup and set values?What is plug setting & current settings, what is the difference between them?What is the time delay and time delay multiplier? What is disk emulation and how it is calculated?Impact of disk emulation over pick current and time coordinationHow earlier electromagnetic relays do look like and how they workInduction disc relaysIntroduction to SEL 751A over current protection relayUnderstand the front interface of the relayLatch and unlatch LedsPickup and reset of relay Introduction to 26MVA transformer nameplateHow to calculate the full load current of HV and LV sidesWhat is percentage impedance and how to calculate the fault MVA with the percentage impedance of the transformer?What is the short circuit current and how to calculate HV & LV short circuit current?How to calculate short circuit current at HV & LV using full load current and percentage impedance?Calculate the HV over current settings.Best Regards
Who this course is for
Any one eager to learn
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