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EEP303: Ex 5

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EEP 303 lab report

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EEP303: Ex 5

  1. 1. EEP303-Experiment 5 NEGATIVE PHASE SEQUENCE RELAY Submitted By: CIDDHI JAIN-2010EE50011 INDRA BHUSHAN-2010EE50548 MEHUL MITTAL-2010EE50553 SHRISTI MAHAJAN-2010EE50561 UMANG GUPTA-2010EE50564 VIVEK MANGAL2010EE50566
  2. 2. AIM: 1. To study the construction of a typical negative phase sequence relay. 2. To experimentally verify the calibration of the typical negative phase sequence relay. APPARATUS: 1. Negative phase sequence relay. Time setting-9sec 2. Current transformers – 2 nos. 3. Rheostats 4. Ammeters Circuit Diagram:
  3. 3. OBSERVATIONS: The first fault was done in R-Y line in which both the current transformer was working in the circuit. Ammeter Reading: I=0.9 A The negative sequence current is I/√3=0.51 A . This is greater than relay current threshold of 0.5 A. The relay tripped after 9sec. I=0.5 A The negative sequence current is I/√3=0.3 A . This is lesser than relay current threshold of 0.5 A. The relay didn’t tripped. The relay functioned correctly. The connections and theory was verified. The time for tripping is kept high so as to neglect initial transient current in the circuits. Next fault was done in B-R line in which only one the current transformer was working in the circuit. Other C.T. was removed Ammeter Reading: I=0.9 A The negative sequence current is I/√3=0.51 A . This is greater than relay current threshold of 0.5 A. The relay tripped after 9sec.

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