LAB3.docx - POWER SYSTEM PROTECTION SWITCHGEAR LAB ASSIGNMENT 03 SURABHI RAMAN 17BEE0029 PERFORMANCE CHARACTERISTICS OF CURRENT TRANSFORMER Ex.No:03 Aim

LAB3.docx - POWER SYSTEM PROTECTION SWITCHGEAR LAB...

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POWER SYSTEMPROTECTION &SWITCHGEARLAB ASSIGNMENT - 03SURABHI RAMAN17BEE0029
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PERFORMANCE CHARACTERISTICS OF CURRENT TRANSFORMEREx.No :03Aim:I) To draw the Magnetization characteristics and load characteristics of current transformer II) To calculate the ratio error and phase angle for the given CT.Apparatus Required:S.NoDescriptionRangeTypeQuantity1.Voltmeter (0 – 300)V, (0- 30)VMI22.Ammeter(0 – 1)A,(0 – 10)AMI23.Current Transformer10:1 Ratio-14.1 Auto Transformer(0 – 270) VAC15.Loading Rheostat(0 – 10) A-16.Connecting Wires--As Req.Theory:The CTs and PTs used in protective relaying have two important roles to play namely:Electrically isolate the protective relays from the high-voltage power system for ,the purpose of safety of the operating personnel.Step down the current and voltage to standard values of 1 A, 5 A, 110 V so thatthe design of relays can be standardized irrespective of the actual primaryvoltage and current.Measurement CT and Protective CTCTs are also used for measurement purposes. However, the desired responsefrom measurement CTs under short-circuit conditions (when the primary current is high)is Quite different. A protection CT is required to faithfully transform the primary currentThroughout its entire range from normal load current to short-circuit current. A
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