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Can anybody suggest tests required for 500MW alternator which has supplied severe fault current above the short time rating,please give any references available to look for solution

can any body tell how to calculate the capacity (KVA) of a zig-zag grounding transformer ,we are using this to provide ground fault path to 33 KV delta system ,we want to use the secondary of this Tr for Aux load(33KV/415V)

in 3ph 3wire meter whether exact energy measurement of Three Phase Unbalanced load is possible?the supply side is star grounded and load side is star grounded,but there is no neutral wire running between supply and load.if Y ph load is more than the R&Y loads what happen to energy...

With omicron CT analyser we tested 2 220KV cts, one having Kx 26 & other having 75 both are having Knee point #voltage 1600 (Name plate), actual 1800&2400respectively, one is STR=26.1 other 40KA during a fault of 34KA what will the difference in behaviour of CTs ,is there any chance of CT...

thanks, can you provide me some more details? or some related links of documents related with this, i required this for some investgation purpose ogf energy theft in 33KV level by suspected DC injection, one 50MVA transformer failed due to this(suspect only,no details) any practcal circuits...

whether Metering CT can be saturated with injection of DC by using diodes? what is the Direct current required in primary to saturate CT?how long this current can pass through CT without affecting CT life?

please clarify in detail

Dear ohmly, Thanks for your reply, but can you put some more light on this issue? tsknan

Can anybody explain what is dimensional factor in Current transformer?what is its significance?what is the effect on CT saturation with low/high Kxetc.

In Micom P341 relay can any body explain exactly what does the meaning of slope k2(manufacturer reccoments 150% for this setting),normaly we use slope of 0.25 or some thing like that for a differential relay,but here the value is some what confusing,please clarify,how we can draw the...

for all differential protections the circuit diagram is as shown,no dubt at all offcourse specific to relay,but the principle is same.

one thing i forgot to mention,ours is power transmission system,we are supplying power to the consumers,one of the consumer is having furnace tr.

yes we have measured the harmonics of the current flowing through the grounding tr NCTs,which are used for E/f protection

Anybody tell me about which transformer Star-Delat or Star-Star is more suitable for supplying power to furnace transformers? Any specific requirements for power system (Fault level,voltage level etc.)for supplying power to furnace transformers? recently one power transformer(in a bank of...

recently i have tested the the system with two gr.Tr ,when both are in service i found higher harmonics currents are found flowing through ground terminals of both ,but when only one in service the current disappeared v,caN ANY BODY EXPLAIN

we have 132/33kv transformers with star-delta vector group running parallel,33kv side is delta and to provide earth fault path we uses zig-zag transformers.in this common 33kv system can we put two grounding transformers in service at a time,recently i have read this is not reccomonded,if so any...