Interested to Buy Any Domain ? << Click Here >> for more details...
what is the CT of protection and CT of metering ? what is
class 5P10 & 5P20 and class PS ?
- 16 Answers
- 131199 Views
- JEE Main, ONGC, VRA, I also Faced
- E-Mail Answers
Answer Posted / pin baloo
Standard accuracy classes:
At rated frequency and with rated burden connected, the amplitude error and phase error and composite error of a CT shall not exceed the values given in the following:
Accuracy class//Amplitude error at rated primary current(%)//Phase displacement at rated primary current(°)//
Composite error eC at rated accuracy limit primary current(%):
5P // ±1% // ±1° // 5%
10P // ±%3 // - // 10%
Marking: The accuracy class of a CT is written after the rated power. E.g. 10 VA 5P10, 15 VA 10P10, 30 VA 5P20
Accuracy limit current IAL:
Current transformers for protection must retain a reasonable accuracy up to the largest relevant fault current. Rated accuracy limit current is the value of primary current up to which the CT will comply with the requirements for composite error eC.
Accuracy limit factor kALF:
The ratio of the accuracy limit current to the rated primary current.
kALF = IAL/IN. (eq. 2)
The standard accuracy limit factors are 5, 10, 15, 20 and 30.
Marking: Accuracy limit factor is written after the accuracy class. E.g. 10 VA 5P10, 15 VA 10P10, 30 VA 5P20.
| Is This Answer Correct ? | 26 Yes | 8 No |
Post New Answer View All Answers
What is the maximum operating temperature for a thermoplastic insulated cable?
Give details of your interested designation, the post you are interested to serve the company better and explain why you think you can serve the company better in such position if employed?
I have a small system with two motors that are running on 380 vac, 60 hz. These motors are expensive and I usally get them from Brazil. I am adding another motor to the system, but I want to purchase a 480 vac, 60 hz motor to use. It will be on a VFD that is rated fro 380 thru 480. Is this posible and will I have to use a larger motor and derate it?
what is the difference between transformer,converter and transducer
Difference between shunt, PMG and AREP excitation. Which is the most reliable between PMG and AREP.
How harmonic block test are conducted on relays ( Siemens,Areva ect )power transformer using omicron kit?
We have Diesel generator of 200KW. fuel consumption is always same,even connected light load or full load. Is it right?
is it possible to test of bus bar in high rise building without completed full floor ?
advantage of motor design on higher power factor . normally motors are designed for .8 power factor. what is advantage of designing at .88 power factor
what is the breaking capacity and making capacity of circuit breaker and how
Hi I'm doing my MBA(3rd semester).I applied for the post of ET conducted by BHEL the last year.I cleared the written and lost in personal interview.Again I wrote the exam this time and cleared the written n yet to take the personal interview.Shall I disclose in the interview about my studies.What shall i say if they ask about my change from studies to job
What descriptive information does the NEC require to be marked on all conductors?
Can u tell me design of switch yard
What is the rating factor for copper cable ( Specific value according to the type of laying ) & the voltage drop?
Explain in brief description about the operation of DG sets.
