Traction Rolling Stock - Indian Railways Institute of Electrical ...

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) Check capacitor of headlight stabilizer, c) Check transformer and tap changer oil for di-electric strength and acidity. Recondition/ replace, if necessary. d) Check the switch angle of SMGR. e) Overhaul SMGR. f) Lubricate all electro-pneumatic contactors. g) Check Q factor of electro-pneumatic contactors. h) Inspect dynamic braking resistor for damage. Overhaul and record resistance. Section E3 Carry out the following: a) Lubricate Arno bearings, measure and record insulation resistance values. b) Overhaul brush holder insulators. c) Overhaul auxiliary machines. Section E4 a) Overhaul and calibrate main power circuit overload relay (QLM), silicon rectifier overload relay (QRSI), electric braking overload relay (QF), braking excitation overload relay (QE), power circuit earth fault relay (QOP), auxiliary circuit earth fault relay (QOA) and No-volt relay (Q30). b) Overhaul and test Q118, Q44, QTD and Q 48. c) Overhaul and test SMGR relays (Q51, Q52), QD and Q20. d) Overhaul speedometer. 8.10 INTERMEDIATE OVERHAUL (IOH) 8.10.1. IOH of locos may be done at the homing shed itself or at a workshop nominated for the purpose. 8.10.2. During IOH, in addition to a thorough inspection of all mechanical and electrical items as detailed under IA, IB, IC and AOH, squaring of bogies should be done and traction motors, rectifiers, auxiliary machines, blowers, tap changer, pantograph etc. should be taken off the loco and overhauled. Transformer oil should be filtered and replaced if acidity is beyond the permissible limits. All wheels should be re-profiled. Insulation resistance of all HT and LT circuits should, be measured and recorded. Approved modifications, which can be executed in the shed, should be carried out.
8.11 PERIODICAL OVERHAUL (POH) 8.11.1 The nominated POH workshop should issue a programme for POH of locos at least six months in advance giving the individual numbers of locos to be called in, month wise. The homing shed will then send to the workshop a list of important points to be specially attended to during POH and the list of modification to be carried out. This will enable the workshop to plan POH work and arrange for procurement/shop manufacture of components required. 8.11.2 The loco should be sent to its own power from the homing shed to the workshop under escort and alongwith its History Book. A complete list of all deficiencies in the loco should be handed over to the workshop representative who should jointly check the loco along with the shed representative. 8.11.3 All approved modifications should invariably be carried out during POH. Deferment of any item may be done only with the personal approval of CEE controlling the POH shops in concurrence with the CEE controlling the homing shed and under advice to the homing shed. In addition to all the items indicated against IOH, renewal of liners, bushes etc. should be done so as to ensure clearance and tolerances with adequate margin for wear in service is available till the next POH. 8.11.4 In addition to complete LT and HT testing of the locos on completion of POH, individual items should also be subjected to detailed tests after overhaul and repair. Detailed test schedules should be laid down for each time for mechanical as well as electrical tests and standard proforma should be available for recording the test results for each equipment. A typical list of tests to be carried out on equipment is given below. 8.11.4.1 Rotating machines- Insulation resistance by megger, no load tests, full load tests (except for traction motor) drop test of armatures, resistance measurement of field coils, temperature rise measurement. 8.11.4.2 Transformers- For small transformers in control circuits, ratio test and insulation resistance measurement. 8.11.4.3 Relays- Measurement of resistance and insulation values for operating coils, pickup and drop off values of voltage/current, time delay where applicable, opening and closing of contacts. 8.11.4.4 Contactors- Measurement of pick up and drop-off values for operating coils, check for simultaneous closing of all phases where applicable. Leakages from valves and cylinder in the case of electro-pneumatic contactors. 8.11.4.5 Cables- Insulation and continuity tests, high voltage tests for rewired panels. 8.11.4.6 Resistors, Condensers and Reactors: Measurement of insulation resistance and ohmic values of resistance/reactance. 8.11.4.7 Air blast circuit breaker- Insulation resistance of coil windings and live, parts, minimum pick up voltage for operating coils, opening and closing time for primary and secondary contacts, minimum pressure for locking in, sequence of opening and closing of auxiliary contacts. 8.11.4.8 Miniature Circuit Breakers (MCBs)- Tests for tripping at rated instantaneous trip value. 8.11.4.9 Tap changer- Insulation resistance, BDV and acidity testing of oil, correct functioning with minimum air pressure relay , correct progression and regression sequence. 8.11.4.10 Silicon Rectifiers- Forward voltage drop, inverse resistance, HV test for complete assembly, voltage sharing between diodes, testing of cell-check device. 8.11.4.11 Compressors and exhausters- Volumetric efficiency and leakage tests.
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PREFACE The book on "Traction Rolli
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A.C. LOCO EQUIPMENTS 1.1: ROOF EQUI
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Fig.1.1.3
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Leg I A I = 704 cm 2 (Regulating tr
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Voltage Primary output : Primary ma
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y the main shaft through gear arran
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Base load … 500 ohms,300W (12nos.
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1.4.6 Over-voltage Over -voltage in
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2.3 BOGIE COMPONENTS Bogie of a loc
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Fig. 2.5. Primary and secondary sus
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2.8 BOGIE OF WAG/7 This is a 3 axle
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Fig. 1. Single Reduction Gear Drive
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FIG.3.6 ROTOR HOLLOW SHAFT DRIVE
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5. POWER CONTROL AND AUXILIARY CIRC
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Permanent field weakening resistanc
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5.4.1 Arno converter (CVAR) The sin
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pantographs 1 and 2 are lowered. Po
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the tap changer comes to a standsti
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d) The tap changer GR must be at po
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5.7.3.1 Control of transformer tap
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VE2. The limit contacts of 61-62 fo
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With multiple unit operation the ma
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elay Q48. If the wheels on one bogi
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5.9.1.4 Lamp LSGR (Green) Tap chang
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cabs are controlled by means of the
Page 73 and 74: 6. AIR COMPRESSOR 6.0 INTRODUCTION
Page 75 and 76: 6.3 COMPRESSOR DETAILS Model : TRC
Page 77 and 78: 1) Type & Make : 1) Northey Type 25
Page 79 and 80: one shaft to the other, and maintai
Page 81 and 82: 7. BRAKE SYSTEM OF ELECTRIC LOCOMOT
Page 83 and 84: y the driver’s vacuum brake valve
Page 87 and 88: 7.2 DUAL BRAKE SYSTEM ON ELECTRIC L
Page 89 and 90: is run to maintain vacuum in the sy
Page 91 and 92: 1. MR equalising pipe 2. BC equalis
Page 97 and 98: 7.2.11 Gauges There are five gauges
Page 99 and 100: akes. e) When Driver makes an emerg
Page 101 and 102: train. Failure of the orange lamps
Page 104 and 105: 8. MAINTENANCE, AND OVERHAUL SCHEDU
Page 106 and 107: e made to increase the interval bet
Page 108 and 109: 8.5.2.6 Battery: Check and record b
Page 110 and 111: cab 1 a) Raising of pantograph. b)
Page 112 and 113: d) Check containers of batteries fo
Page 114 and 115: Section E4 Carry out following: a)
Page 116 and 117: f) Inspect all resistance, includin
Page 120 and 121: 8.11.4.12 Speedometers- Calibration
Page 122 and 123: 8.15.3 One copy of the certificate
Page 124 and 125: to eliminate the possibility of fir
Page 126 and 127: invariably be a member of the inqui
Page 128 and 129: Two capacitors of 0.05 microfarads
Page 130 and 131: Notch 18 T3 and T8 closed, connecti
Page 132 and 133: These machines are capacitor start
Page 134: The main lighting circuits are fed
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