What is class ps current transformer?
PS Class CT is also known as PX Class or simply Class X Current Transformer. It is special type of current transformer meant for protection purpose. Various protection class CTs as described in IS 2705 part-3 is only useful for overcurrent protection. You may refer Accuracy Class of CT for detail.
What is the meaning of PS class CT?
The PS class CT is special protection class CT. Both the PS class CTs used for differential protection have identical saturation characteristics and their knee point voltage is the same.
What is 5P class CT?
Limit of Error for Accuracy Classes 5P, 10P and 15P: This marking means that, the burden of CT is 30 VA and the maximum composite error at 10 times of rated current is 5%.
What is difference between PS and PX class of CT?
The main difference between protection class P class CT and PS class CT is that the P class CT does not have fixed knee point voltage, whereas the PS class CTs have the identical knee point voltage at the same excitation current. The PS class CT have identical Characteristics.
What is the difference between PS class and 5P20?
the accuracy of PS class is not defined. generally used for unit protections differentials…. And a 5P20 CT means it will give a +_5% error when it reads 20 times the rated current …which means when a fault happens more than the CT ratting upto 20 times it can measure with a 5% errors with plus minus…
What does 5P20 CT mean?
The Number ‘5’ indicates the accuracy of the CT. When the current flows through the 5P20 protection class CT is 20 times of the rated primary current, the CT reads within the composite error of 5 %. If the current is above 20 times then the CT will saturate.
What is 0.5 S Class CT?
For Current Transformers: Class 0.5s is more accurate when you got low values of current. For class 0.5s and with a current between 1-5% In, you got on class 0.5s a 0.75% error. For class 0.5 and with a current between 0-5% In, you got on class 0.5s a 1.5% error. For a current equal to In, they both got a 0.5% error.
What is 0.2 S Class CT?
High measuring accuracy The very high 0.2s accuracy class guarantees maximum metering, even with low loads. 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 RCT in current transformer?
The RCT indoor current transformer is used for metering and relaying applications in medium voltage (5 – 15 kV) switchgear. The RCT indoor current transformer is used for relay- ing and metering applications in medium voltage (5 – 15 kV) switchgear. The RCT-5 is sized for 5 kV switchgear.
What does CT 5P20 mean?
What is meaning of 5P10 in CT?
If you see the specification or name plate of a protection class CT, you will find that it is given like 5P10. This CT can be interpreted as a protection class CT having an accuracy of 5% over a current range of 10 times of normal primary current rating.
Which CT is better 5P10 or 5P20?
Its application which differetiate the use of 5P10 and 5P20. If the breaker is used for backup protection say incommer etc you can use 5P20, but if it is say an incommer ACB/ MCCBof PMCC, you should use 5P10 only.
What is class1 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.