COURSE PLANNER. Subject: TESTING AND COMMISSIONING OF ELECTRICAL EQUIPMENTS ( ) B.E. Fourth Year (8 th Sem) Branch Electrical Engineering

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1 COURSE PLANNER Subject: TESTING AND COMMISSIONING OF ELECTRICAL EQUIPMENTS ( ) B.E. Fourth Year (8 th Sem) Branch Electrical Engineering Term: 16/2 (DECEMBER-16 to APRIL-17) Faculty: Prof. U. V. VYAS Prof. R. H. MISTRY Prof. M. K. TAMBOLI Prof J. P. TOPIWALA Contents: 1. Course Outcomes 2. Course Contents[Syllabus] 3. List of Reference Books 4. List of Experiments 5. Major Equipments required for Experiments 6. List of Open source software and learning websites required for experiments 7. Active Learning Assignments and Tutorial. Instructions for Assignment/Tutorial: [1] This set of Assignment-Tutorial consist questions of collection of past GTU Question papers [2] Attempt those questions which are bold marked and/or frequently asked in GTU Exam. [3] Students should maintain Separate Files Chapter wise [File Pages] to solve these Questions. [4] Student must solve these given set of Assignments by themselves only. [5] Assessment of given assignment should be done regularly after completion of each chapter by Students from the respective faculty members.

2 [1] Course Outcomes: After the completion of this course, the student shall able to do 1. Making schedule of maintenance of different equipment and machines? 2. Design and calculation about CT & PT? 3. Able to Identify Routine test and type test? 4. Trouble shooting chart for various electrical equipment, machines and domestic appliances 5. Procedure of different types of earthing for different types of electrical installations 6. Familiar about electrical safety regulations and rules during maintenance. 2

3 [2] Course Contents: SR NO. SYLLABUS 1 SAFTY MANAGEMENT: Objectives, Safety Management during Operation and Maintenance, Clearance and Creepages, Electric Shock, need of Earthing, different methods of Earthing, factors affecting the Earth Resistance, methods of measuring the Earth Resistance, Equipment Earthing and System Grounding, Earthing Procedure - Building installation, Domestic appliances, Industrial premises, Earthing of substation, generating station and overhead line. 2 INSTALLATION OF ELECTRICAL EQUIPMENT: Inspection of Electrical Equipment at site, Storage Electrical Equipment at site, Foundation of Electrical Equipment at site, Alignment of Electrical Machines, Tools/Instruments necessary for installation, Technical report, Inspection, storage and handling of transformer, switchgear and motors. 3 TESTING OF TRANSFORMER, PLANT AND EQUIPMENT: General Requirements for Type, Routine and Special Tests, Measurement of winding resistance; Measurement of voltage ratio and check of voltage vector relationship; Measurement of impedance voltage/short-circuit impedance and load loss; Measurement of no-load loss and current; Measurement of insulation resistance; Dielectric tests; Temperature-rise, insulation and HV test, dielectric absorption, switching impulse test. testing of Current Transformer and Voltage Transformer, power transformer, distribution transformer, CVT and special transformer with reference to Indian Standard (IS). Drying out procedure for transformer. PI index, Commissioning steps for transformer, Troubleshooting & Maintenance of transformer. [Ref: IS 2026:Part_1-10-Power Transformers: Methods of Test; IS 13956:1994- Testing Transformers] 4 INSTALLATION AND COMMISSIONING OF ROTATING ELECTRICAL MACHINES: Degree of protection, cooling system, degree of cooling with IP- IC code (brief discussion), enclosures, rating of industrial rotating electric machine, installation, commissioning and protection of induction motor and rotating electric machine, drying out of electric rotating machine, insulation resistance measurement, site testing and checking, care, services and maintenance of motors, commissioning of synchronous generator, protection and automation of synchronous generator, synchronous motor, D.C. generator and motor with reference to Indian Standard (IS). [Ref: IS 4029:2010-Guide for Testing Three Phase Induction Motors; IS 7132:1973-Guide for Testing Synchronous Machines; IS 9320:1979-Guide for Testing of Direct Current (dc) Machines] TEACHING HRS. % Wtg

4 5 TRANSMISSION LINE: Commissioning of A.C transmission line and HVDC transmission, galvanize steel structure, towers and insulator for transmission and distribution line, tower footing resistance, substation equipment, bus bar system, power cable, low power control cable, Contactor, GIS (gas insulated substation). 6 SWITCH GEAR & PROTECTIVE DEVICES : Standards, Classification, specification, rating and duties of CB, installation, commissioning tests, maintenance schedule, type & routine tests. Operation of s/s (steps) for line Circuit breaker maintenance. Location of lightening arrester with reasons

5 [3] List of Reference Books : 1. Rao, S., Testing, commissioning, operation and maintenance of electrical equipment, 6/E., Khanna Publishers, New Delhi 2. Paul Gill, Electrical power equipment maintenance and testing, CRC Press, Singh Tarlok, "Installation, commissioning and maintenance of Electrical equipment", S.K. Kataria and Sons, New Delhi, 4. Philip Kiameh, Electrical Equipment Handbook: Troubleshooting and Maintenance, McGrawHill, Relevant Indian Standards (IS Code) and IEEE Standards for-installation, maintenance and commissioning of electrical equipments/machines. 5

6 [4] List of Experiments : SR.NO. LIST OF PRACTICAL 01 Trouble Shooting of Induction Motor 02 Trouble Shooting And Maintenance of Transformer 03 Trouble Shooting And Maintenance of Circuit Breaker 04 Trouble shooting of D.C Machine. 05 Trouble shouting of Synchronous machine. 06 Measurement of soil resistivity Detection of fault location in cable using digital cable fault localizer 08 Open circuit and short circuit tests on single phase transformer 09 Different test on Current transformer. 10 Different test on potential transformer. 6

7 [5] Major Equipments required for Experiments : SR. NO. DEAD STOCK NO GPR NO. PAGE ITEM DESCRIPTION OF ITEMS QTY EARTH TESTER MAKE: NIPPEN CABLE FAULT DETECTOR MAKE: ELECTRON DEVICES 1 7

8 [6]List of Open source software and learning websites required for experiments :

9 [7] Learning Assignments / Tutorial : SAFTY MANAGEMENT: Chapter-1 Objectives, Safety Management during Operation and Maintenance, Clearance and Creepages, Electric Shock, need of Earthing, different methods of Earthing, factors affecting the Earth Resistance, methods of measuring the Earth Resistance, Equipment Earthing and System Grounding, Earthing Procedure - Building installation, Domestic appliances, Industrial premises, Earthing of substation, generating station and overhead line. ATTEMPT FOLLOWING :- SRNO. QUESTION YEAR MARKS What is earth resistance? Explain how earth resistance in substation is measured? Explain the different method for measurement of Earthing resistance. Explain charging current making and breaking test of isolator. What is diff. between system earthing and structure earthing? Explain with diagram, measurement of earth resistance in substation OCT12 SEP-13 JUNE-14 SEP-13 JUNE-14 DEC-14 4 Write Short note on Earthing DEC-15 5 What is the working of ELCB? What are the different tests performed on it? 9

10 INSTALLATION OF ELECTRICAL EQUIPMENT: Chapter-2 Inspection of Electrical Equipment at site, Storage Electrical Equipment at site, Foundation of Electrical Equipment at site, Alignment of Electrical Machines, Tools/Instruments necessary for installation, Technical report, Inspection, storage and handling of transformer, switchgear and motors. ATTEMPT FOLLOWING :- SRNO. QUESTION YEAR MARKS 1 Explain the procedure of alignment of shaft of electrical machines. MAY-12 10

11 TESTING OF TRANSFORMER, PLANT AND EQUIPMENT: Chapter-3 General Requirements for Type, Routine and Special Tests, Measurement of winding resistance; Measurement of voltage ratio and check of voltage vector relationship; Measurement of impedance voltage/short-circuit impedance and load loss; Measurement of no-load loss and current; Measurement of insulation resistance; Dielectric tests; Temperature-rise, insulation and HV test, dielectric absorption, switching impulse test. testing of Current Transformer and Voltage Transformer, power transformer, distribution transformer, CVT and special transformer with reference to Indian Standard (IS). Drying out procedure for transformer. PI index, Commissioning steps for transformer, Troubleshooting & Maintenance of transformer. [Ref: IS 2026:Part_1-10-Power Transformers: Methods of Test; IS 13956:1994- Testing Transformers] ATTEMPT FOLLOWING:- SR.NO. QUESTION YEAR MARKS Explain in detail the procedure of drying out of power transformer. OR Explain drying out method of oil cooled 1 transformer. OR What is polarization Index? What is the importance of it? Explain briefly. OR Explain the significance of Polarization Index Number. Explain drying out procedure of Power Transformer. What is the method for purification of transformer oil? How can we measure Dielectric strength of oil? OR Explain 2 Dielectric strength measurement test on transformer oil. OR Explain the purification and filtration process of transformer oil. Explain the following test regarding transformer 3 (1) Polarity test (2) Loss measurement (3) Power frequency with stand test (4) Ratio Checking Test (5) Phase Sequence Test 4 How can we find Dy1 & Dy11 connection in the case of transformer? How can you find out the polarity test in case of three phase power transformer and what is the significance of it? Can 5 we connect Dy1 & Dy11 transformer in parallel? Give your reason. OR Draw DY1 & DY11 type transformer connections & state feasibility of connecting them in parallel with reason 6 Explain the properties of Transformer oil. Explain Dielectric 7 test of transformer oil. Differentiate between type and routine test. Explain any two routine test of Power transformer with necessary circuit diagram. OR List out the routine test and type test on power transformer. Explain the polarity test and Voltage ratio test with the help of circuit diagram. 11 DEC-10 MAY-12 SEP-13 DEC-15 DEC-14 MAY-15 DEC-15 MAY-15 SEP-13 MAY-12 SEP-13

12 8 Explain power frequency and impulse voltage withstand test on three phase distribution transformer. List out the commissioning tests on power transformer. 9 Explain the Voltage ratio test with the help of circuit diagram. 10 Explain with the help of circuit diagram the partial discharge test of transformer. A 3 phase, 6900/415 volt step down transformer having terminals A1, B1, C1 on primary side and having terminal A2, B2, C2 on secondary side and N indicate the neutral terminal on primary side. Now A1 and A2 are short circuited and by applying 3- phase supply of 435 V on primary the. following reading was 11 obtained A 1, B1=435V B1, B2=415 C1, B2=440 A1, N=250 B1, C1=435V B1, C2=415 A1, C2= 25 C1, A1=435V C1, C2=420 C2, N=225 Then with the help of phasor diagram find the vector group of Transformer. Why to conduct tan delta test on transformer? Explain it with the 12 help of circuit diagram What is the significance of partial discharge measurement and Tan Delta test in case of transformer? What are different types of tests performed on electrical equipment? Explain them briefly. Explain the Phase group of Power Transformer with necessary vector and winding diagram. Explain procedure for high voltage testing on electrical equipments. State the properties of good transformer oil? Explain BDV test on transformer oil. OR Explain Breakdown voltage (BDV) test of Transformer oil & State properties of Transformer oil Explain with setup sketch, Impulse testing for power transformer. List out the various tests on transformer. Explain temp. Rise test for same. Explain the significance of following in performance of electrical equipments. 1. Partial discharge test on transformer. Explain meaning of insulation resistance. How is it measured for power transformer DEC-14 JUNE-14 MAY-12 MAY-12 DEC-10 MAY-12 DEC-15 SEP-13 JUNE-14 JUNE-14 MAY-15 DEC-14 DEC-14 MAY-12 DEC-14 MAY-15 12

13 INSTALLATION AND COMMISSIONING OF ROTATING ELECTRICAL MACHINES: Chapter-4 Degree of protection, cooling system, degree of cooling with IP- IC code (brief discussion), enclosures, rating of industrial rotating electric machine, installation, commissioning and protection of induction motor and rotating electric machine, drying out of electric rotating machine, insulation resistance measurement, site testing and checking, care, services and maintenance of motors, commissioning of synchronous generator, protection and automation of synchronous generator, synchronous motor, D.C. generator and motor with reference to Indian Standard (IS). [Ref: IS 4029:2010-Guide for Testing Three Phase Induction Motors; IS 7132:1973-Guide for Testing Synchronous Machines; IS 9320:1979-Guide for Testing of Direct Current (dc) Machines] ATTEMPT FOLLOWING FIVE :- SR.NO. QUESTION YEAR MARKS 1 Explain degree of protection (IP Grade) of Induction Motor. SEP What is polarization index? How can you measure the slip of induction motor? OR What is the necessity of drying of electrical equipment? Explain polarization index of 3-phase induction motor. Explain noise measurement, vibration measurement and slip measurement in case of three phase induction motor. OR State the methods of measurement of slip of induction motor. Also explain any one in detail. OR Explain the different methods of slip measurement of Induction Motor. OR What is slip of an Induction motor? How can you measure the slip of an induction Motor? Explain purposes for performing No-load and Blocked rotor tests on 3-ф induction motor. For the following conditions explain in detail troubles, causes and its remedies for 3-ф squirrel cage induction motor. i) Motor fails to start ii) Motor runs at 1/7th synchronous speed. iii) Motor heats up. Give causes, consequences and remedies for the following abnormal conditions of 3-phase induction motor. 1.Over heating 2. Stalling 3. Excessive speed. OR Explain various troubles, causes & remedies of 3 phase induction motors Explain the Troubleshooting and Maintenance of induction motor. 13 MAY-12 DEC-14 SEP-13 DEC-14 MAY-15 JUNE-14 JUNE-14 DEC-14 MAY-15 SEP-13 8 Explain drying out procedure of a 3-ф induction motor. JUNE-14 9 How could you measure DC resistance of 3 phase induction DEC-15 motor? 10 State the various troubles with commutator and brush gear, MAY-12 their causes and remedies.explain the choice of selection of DEC-14 materials used for the brushes of various rotating machine. 11 Why the Hopkinson s test performed on D.C. machine? Explain it. SEP-13

14 12 Explain voltage drop and bar to bar test of DC machines. OR How bar-to-bar test is performed on DC machine? State importance of this test. SEP-13 JUNE Explain Back to back test on DC Machine MAY Explain Field test on DC Machine MAY-15 List out the various test performed on the synchronous 15 machine. Explain any two tests with necessary circuit MAY-12 diagram and also explain its significance. OR Explain open MAY-15 circuit test & short circuit test on a synchronous machine 16 Explain commissioning steps for synchronous machines DEC-14 DEC-15 Explain the testing of Voltage Regulators and Excitation Circuit of Synchronous Generator. DEC-14 Explain the procedure of high voltage tests on rotating machine MAY-15 Explain retardation test on synchronous machine on load & on no load MAY-15 14

15 TRANSMISSION LINE: Chapter-5 Commissioning of A.C transmission line and HVDC transmission, galvanize steel structure, towers and insulator for transmission and distribution line, tower footing resistance, substation equipment, bus bar system, power cable, low power control cable, Contactor, GIS (gas insulated substation). ATTEMPT FOLLOWING THREE:- SRNO. QUESTION YEAR MARKS 1 State the types of cable fault locators and their applications. MAY-12 Explain following test regarding cable 2 1) High voltage test. 2) Insulation resistance test JUNE-14 3) Conductor resistance test OR Explain insulation resistance measurement for cable Explain Murray loop test of cable. OR Explain Murray loop test for ground fault location in underground cable OR What are the different methods to find out cable fault? Explain one of them. OR Explain how to check cable fault by means of a Megger & discuss murray loop method for locating cable faults Explain dc charge and discharge test to find discontinuity of cable conductor Explain the significance of following in performance of electrical equipments. 1. Insulation co-ordination in sub station Explain power frequency voltage withstand test, impulse voltage withstand test & vibration test on busbar SEP-13 JUNE-14 MAY-15 DEC-15 DEC-14 MAY-15 15

16 Chapter-6 SWITCH GEAR & PROTECTIVE DEVICES : Standards, Classification, specification, rating and duties of CB, installation, commissioning tests, maintenance schedule, type & routine tests. Operation of s/s (steps) for line Circuit breaker maintenance. Location of lightening arrester with reasons ATTEMPT FOLLOWING:- SRNO. QUESTION YEAR MARKS 1 Explain with the help of necessary diagrams the various MAY-12 types of test performed on high voltage A.C circuit breaker SEP-13 2 What is the significance of polarity in case of current transformer? How can we test the polarity of C.T? JUNE-14 Explain the following test regarding circuit breaker 3 1) Mechanical endurance test, 2) Measurement of breaker SEP-13 time 3) Impulse testing. OR Explain Mechanical Endurance JUNE-14 and Impulse testing of Circuit breakers. MAY-15 4 Explain short circuit testing on circuit breaker with plant layout. JUNE-14 Define a burden on a CT. What are the markings on primary & 5 secondary terminal CTs? How the polarity of CT is MAY-15 determined? 6 Explain short time current test on circuit breaker. DEC-15 16