Interested to Buy Any Domain ? << Click Here >> for more details...
how to calculate restraing current and operating current
for differential protection if 20 mva transformer is OLTC
33 kv/11 kv ? and what should be the type and ratio of CT?
- 2 Answers
- 6150 Views
- L&T, OPS, I also Faced
- E-Mail Answers
Answer Posted / raghavendran.r
It requires the HT and LT side current ratings to be calculated.The current on the HT side comes around 606A(line current) and on the LT side it is 1818 A(line current), Considering that HT and LT are Delta and Star type wounded respectively.
But for Merz-Prize protection, the CT on Delta side should be Star wound and for the CT on the Star side of Power Trans,it should be delta Wound.
So calculating the primary currents of the CT1 and CT2 we get 350A and 1818A respectively.
Now we have a standard CT ratio of 400/5A and 2000/5A in the market.Which can be used here.
Now the formula for Operating current is mod[Is1 - Is2] = K[Is1+Is2]/2 = K * Iavg.Where K = .1 a constant.
| Is This Answer Correct ? | 1 Yes | 1 No |
Post New Answer View All Answers
How to select transmission line type (i.e. 11kv or 33kv) for new established industries
how to setting Load amps tripping time and extra settings for load Transformer protection relay with RMU panel using C&S model relay..?
Is there any type of starter for DC motor other than two point,Three point and Four point starters?
whatare the disadvantages occur,if the form factor of transmission will not be equal to 1.11
how single phase preventer works ?
delta motor winding resistance I take normally single winding is 2.5, which value is came delta connection ie RY ?
Why we are use dol starter up to 10 hp
What is difference between YNyn0 and YNyn ??
Consider three heater bank connected in 3 phase star with neutral.Each heater bank connected in each phase.So each phase get 230 volts supply.my question is,during balance condition, current flow in neutral or Not
what will be the min and max voltage flow from neutral to earth?
WHY THREE PHESE SYSTEM VOLTAGE APPLIED IN 440 VOLT
1. How many types of mangers? 2.How many types of capacitors? 3.pls tell me normally types alternator problems?
Briefly describe your ideal job?
What is open delta Xformer? It's adavntages & Use?
How delta connection in the primary of distribution transformer reduces harmonics?how delta connections reduces harmonics?Please answer me...Hope that question is correct.
