To Answer this question, first we will see how the tripping works in Main Bus and then we will see how the Tripping works in Transfer Bus.How the Tripping takes place when there is a Fault on the Main Bus or the LBB Operate?Ans:Case 1: When a Fault occurs in say Section 1 on the…
Answer:The Metal Sheets used for Transformer Core are Isolated/insulated from each other.The Core is Grounded by connecting it to Structure of the Metal Transformer, which is grounded.This Core Grounding is done from one Point only, because Multiple Grounding will result in Circulating Current, which inturn will heat up the Transformer. Frequently Asked Questions: Why is…
Discover the essential conditions for the parallel operation of transformers, ensuring optimal performance when two or more transformers are connected in parallel.For efficient parallel Operation of Transformers, following conditions must be met: 1.Same Voltage and Turns Ratio : Voltage Rating (Primary and Secondary) of all the Transformers connected in Parallel should be same. Tap Position…
Answer: Please find below Specifications for 33/22 kV Feeder OC & EF Relay 1) 3OC+ 1EF with internal LBB , lowest and highest function2) LBB initiation- internal/external3) LBB reset- with current4) auxiliary DC- 30- 250V DC5) binary input voltage- 110v or220V configurable6) IEC 61850 compatible7) binary input 6, output 88) watch dog contact require9) CT…
Protection system is the most critical part of the Power system and needs to be handled with utmost care. What is the main objective of Power System Protection ? Ans: Isolate the faulty Section from the Live System to prevent the flow of Fault current through the system, so that there is no interruption in…
This Article describes the Standard Operating Procedure we need to carryout in case Buchholz Relay Alarm or Trip Operates in Power Transformer. Answer: When the Buchholz Relay Operates, we need to carry out following steps: Frequently Asked Questions: What is a Buchholz Relay? Buchholz Relay is a Gas Operated Relay (Mechanical Protection) which provides Mechanical…
In this Article , we will explore the essential conditions for successful auto-reclosing of EHV transmission lines on fault. For the successful auto reclosing Operation of overhead lines, following conditions should be satisfied: For other Faults, CB not Ready, AR Out of Service, CB Status not available, there will be Auto-reclose Lockout i.e. the Relay…
First, we will try to understand what LBB is and why it operates. What is LBB? and When does it Operate? Ans: LBB is a Backup Protection to the Breaker, which operates in case the concerned Circuit Breaker fails to operate in 200 ms, by tripping all the Fault infeeds ( all the Circuit Breakers…
Plug Setting is the Current Setting of the Relay.
It is given by the Percentage of the Relay Nominal Current (In), which when flows through the Relay, the Relay Operates.
Where the Relay Nominal Current (In) is kept the same as the CT Secondary Current which is usually 1A or 5A.
TMS is used to control the Operating Time of the Relay (ROT).
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