What is accuracy class of potential transformer?
Accuracy Class: For measuring voltage transformers, the accuracy class is designated by the highest permissible percentage voltage error at rated voltage and with rated burden prescribed for the accuracy class concerned. The standard accuracy classes for measuring voltage transformers shall be 0.1, 0.2, 0.5, 1.0 and 3.
What is a Class 1 CT?
The class designation is an approximate measure of the CT’s accuracy. The ratio (primary to secondary current) error of a Class 1 CT is 1% at rated current; the ratio error of a Class 0.5 CT is 0.5% or less. Errors in phase are also important, especially in power measuring circuits.
What is accuracy class VT?
The accuracy class is guaranteed if the voltage is between 80 and 120% of the rated primary voltage and for any load between 25 and 100% of the rated accuracy power with an inductive power factor of 0.8. The standardized IEC accuracy classes are: 0.1 – 0.2 – 0.5 – 1 – 3.
What is the standard accuracy class of metering current transformer?
Standard Accuracy Class of Metering CT are 0.1, 0.2, 0.5, 1, 3 and 5. Each of these class have different maximum permissible current error.
What is 0.2 S Class CT?
An 0.2s accuracy class means that the measurement has an error rate of 0.2% over a range of 20 to 120% of the nominal current (In) and at a specific accuracy above 1% of In.
What is accuracy class CT?
Accuracy Class of Current Transformer The accuracy class or simply class of measuring current transformer is 0.1, means the maximum permissible limit of error is 0.1%, more clearly, if we try to measure 100 A with a 0.1 class CT, the measured value may be either 100.1 or 99.9 A or anything in between these range.
What is meant by accuracy class?
Accuracy classes are defined and used in IEC and ANSI standards. Typically, a class specifies accuracy at a number of points, with the absolute accuracy at lower values being better than the nominal “percentage of full scale” accuracy. Accuracy classes such as IEC’s 0.15s are a ‘special’ high accuracy class.
What is accuracy in current transformer?
Accuracy class of current transformer is the highest permissible percentage composite error at rated current. The standard accuracy classes of current transformer as per IS-2705 are 0.1, 0.2, 0.5, 1, 3 and 5 for metering CT.
What is class 0.5 accuracy?
Class 0.5 means that the accuracy is 0.5% of the reading under full load and unity power factor, similar to 0.5% FS above, yet sets a standard for accuracy under lower (typical) loads and different power factor.
What is 0.2 s accuracy?
What is accuracy limit factor in current transformer?
The rated accuracy limit factor (Fn) is the ratio of the rated accuracy limit primary current to the rated primary current. A protective current transformer type 5P10 has, for example, the accuracy class 5P and the rated accuracy limit factor 10.