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By Edvard Csanyi | Feb, 5th 2018 | 5 comments | Translate | Save to PDF
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Home / Technical Articles / Four Special Differential Protections And Their Respective CT Requirements
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Sir, in case of important protections in / for substation, 1 more may please be added for DC control supply circuitry i.e. alarm for D. C. Earth Leakage. Protection to prevent nuisance operation of circuit breakers or any other components in generating stations.
If in case for line differential protection, I have two different CT (Ratio,etc is different) at both ends. How can we utilize this protection. In simple way, why it is must to provide matching type CT including all parameters at both sides. Please provide me response in such a way that using some calculation for my better understanding
In IEC 60038 why gap between 230KV to 245KV as below in band 4 to 5
band 1 – A.C. systems 100 V to 1000 V
band 2 – A.C and D.C traction systems
band 3 – A.C. systems above 1 kV to 35 kV
band 4 – A.C. systems above 35 kV to 230 kV
band 5 – A.C. systems above 245 kV
In case of a fault on line between a transformer and their breaker
Who will initiate the trip first the 51 protection or 87 T.
Thanks in advance.
The primary protection which is 87. 51 is the back up protection, whenever the primary protection fails to operate then the back up protection will operate.