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Current Transformer Basics Accuracy Class Burden Knee Point CT Errors
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Current Transformers are classified into two different categories based on their applications in electrical power system network. • 1. Protection CT • 2. Measuring CT • Protective current transformers are used with relays, trip coils, pilot wires etc. • Metering current transformers are used with Ammeter, Wattmeter etc. • Join this channel to get access to perks: • / @smarteducare • Errors in CT: There are three types of CT errors as follows: • Ratio Error or Current Error: Ratio error is defined as the percentage error in the magnitude of the CT secondary current. • Phase Angle Error: It is defined as the phase angle between primary current vector the reversed secondary current vector. • Composite Error: It is defined as the r.m.s. value of the difference (Knis - ip) integrated over one cycle under steady condition. • Accuracy Class of CT: Accuracy class of CT is the class assigned to the CT with the specified limits of ratio error and phase angle error. • CT Burden: The circuit or load connected to the secondary winding of CT is called ‘CT burden’ which is expressed in ‘VA’. The burden on a protective CT comprises of the individual burdens of associated relays, trip coils, connecting leads etc. Total burden is calculated by adding all of these individual loads. • Why CT Secondary is never Open Circuited? • If the CT secondary is open-circuited, the secondary peak voltage may reach up to some kilo volts. The working flux increases and CT core gets saturated. CT primary and core get over-heated and voltages are induced in secondary side by electro-magnetic induction. This is very dangerous for the working personnel on the secondary side. Hence, CT secondary should never be disconnected when current is flowing in the primary side. • CT Magnetization Curve: • Magnetization Curve of CT can be sub-divided into four main regions. • 1. Origin to ankle point • 2. Ankle point to Knee point • 3. Knee region • 4. Saturation region • Knee point voltage of CT: • Knee point is defined as the point where 10% increase in the applied voltage will cause 50% increase in excitation current. Above the knee point, CT will mal-operate and will tend to saturate. • Watch the video till the end and you can also visit the above link for the details as a full article. • Put your comments and let’s know if you have any query. • current transformer (CT) कैसे काम करता है | ct, pt practical video | 66 kv grid substation in hindi • Current Transformers (CT) • Current Transformer (CT) Nameplate Details Explaination • Current Transformer Knee Point Test || Hindi • Current Transformer Concepts| CT Burden | CT Accuracy Class • What is CT and PT. Current Transformer and Potential Transformer (Hindi) • CT knee point voltage • Important Current Transformer Parameters | Quick Guide | TheElectricalGuy • What is 5P10 class in current transformer • Introduction to Current Transformers Part 1: What are CTs and why use them? • TESTING OF CURRENT TRANSFORMER
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