5P20 CT give more accuracy than PS class CT. 5P20 cant be used in unit protection. Class PS CT is a protection class ct. It is used for differtial proction,distance (UNIT)proction.
I am aware that Class TPS current transformers have a Low Leakage Flux design
What is the ISO protection class for Windsor Locks CT
TPS Class CT is used for transient performance (TP). TPS class Current Transformer has Low Leakage Flux and there is no limit for remanent flux) further there are also TPX,TPY and TPZ class CTs 1. TPX- No Limit for remanent flux due to nil air gap in the core 2. TPY - remanent flux does not exceeded 10 % due to less air gap in the core 3. TPZ- Having practically null remanent flux because there is large air gap is provide in the Core Er. Anil Prajapati, Protection Engineer,Jaipur RVPNL
CL of a CT is its accuracy class.. it is an approximate measure of the CT's accuracy. e.g. The ratio (primary to secondary current) error of a Class 1 (CL:1.0) CT is 1% at rated current
CL of a CT is its accuracy class.. it is an approximate measure of the CT's accuracy. e.g. The ratio (primary to secondary current) error of a Class 1 (CL:1.0) CT is 1% at rated current
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if mark specification of CT mention 5P20 + 0.2,am used at site seconder metering with class 0.2.my question is, at secunder CT site must used auxiliary CT with class 0.2, or not used.tank your answer.
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The question is incomplete, because there are no mention about CT & PT ratios. 600VA 5 can not be CT ratio.
The 0.2S class is more accurate in meter reading than the 0.2 class. The 0.2S class is now mandatory for all meter reading.