Deepakkumar Yadav
Insulation Resistance Test Megger Test This test is also known as megger test. The Insulation Resistance test is routine test. It is usually done at 300 to 500 V D.C. with 100 to 500 Mega ohm resistance. The test voltage is applied across cable insulation and grounded sheath . The voltage and current is measured … Read more
Power Frequency Test of Cables 1. Power Frequency Voltage Withstand Test Wet and Dry Withstand Test The test is performed in wet and dry conditions separately. Before commencement of the test, the insulator is exposed to artificial rain produced as per IS 2071 (Part 1) – 1974 for at least one minute before application of … Read more
Testing of Cables Q. Write a note on cable sample preparation before it is subjected to various tests. Cables play important role in transmission and distribution of electric power. The different tests on cables are tabulated in Table Item Test Category Sr. No Table to be performed Power frequency test 1. Power frequency voltage … Read more
Other Test of Circuit Breakers Temperature Rise Test Mechanical Test 1. Temperature Rise Test Figure A Figure B For measuring temperature to find temperature rise either thermocouples, self resistance method or thermometer is used:In the above circuit thermocouple is used : In the test circuit a special transformer is used. This transformer has primary 230 … Read more
Power Frequency Test of Circuit Breakers Short Circuit Test Synthetic Testing of Circuit Breaker Dielectric Test or Over Voltage Test 1. Short Circuit Test The procedure for this test is similar to that of – Rated short time current test and momentary current withstand test on isolator. The circuit breaker should satisfactorily perform opening and closing … Read more
Testing of Circuit Breakers It is an automatic switching and current interrupting device for opening and closing a current carrying circuit under full load, over load, fault condition and short circuit condition It is a on load making-breaking device. Each of the circuit breaker has rated breaking current and rated making current and short time … Read more
Other Test of Testing Isolators Temperature Rise Test (Heat Run Test) Mechanical Test (Endurance Test) 1. Temperature Rise Test (Heat Run Test) Figure A Figure B For measuring temperature to find temperature rise either thermocouples, self resistance method or thermometer is used:In the above circuit thermocouple is used : In the test circuit a special … Read more
Impulse Voltage Test of Isolators Impulse Voltage Withstand Test The test procedure is similar to that explain for insulators. The impulse generator is adjusted to produce a standard 1.2/50 impulse wave of peak value equal to the specified value of the impulse withstand voltage corrected for atmosphere conditions in accordance with I.S. Five impulse voltage … Read more
Power Frequency Test of Isolators Power Frequency Voltage Withstand Test Rated Short Time Current Test and momentary Current Withstand Test Dielectric Test or Over Voltage Test Power Frequency Voltage Withstand Test This test is similar to dry withstand test explained for insulators. The test is performed in wet and dry conditions separately. Before commencement of … Read more
Testing of Isolator Introduction to Isolators : When carrying out inspection or repairs in a sub – station or charged line repairs it is essential to disconnect the section of line on which the work is to be carried out. This disconnecting device is a isolator. As the name suggests it solates the of the … Read more