Motor/Transformer Winding Repair

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1 Workshop Practice Title and topics of HKSE Fundamentals of specific trade Workshop organisation, industrial safety, quality assurance, introduction to accident prevention Preparation of wires and components Use of tools in electrical assembly, preparation and installation of components Soldering in electrical engineering Soldering of connections, soldering in electrical engineering Production of cable harnesses - tying I Production of cable harness drawings, production of loops and junctions Protective measures in TT/TN system Protection against indirect contact in TN system, protection against indirect contact in TT system Electrical measurement IV Measurement with ohmmeter, resistive checking of various relays Standardisation of wiring Description and designation of power cables and their standardisation Fundamentals of electrical connections Production of low-resistance connections, applications of connection techniques Single-phase motor winding I Setting of coil winding machine, winding of a 4-pole single-phase motor Winding I Production of a former, insulation in a transformer Winding II Types of transformer insulation and functions, explanation of transformer data Universal motor - field winding Removal of a field winding with data recording, production and checking operations Universal motor - armature winding I Working on armature winding and laminated core; armature winding, connection and impregnation Basic contactor circuits I Explanation of principles and marking, design of contactor and reversing contactor circuits Connection and operation of electric motors Single-phase and three-phase motor, star-delta connection and Steinmetz circuit Three-phase transformer windings I Winding of three single-phase transformers with UI core Three-phase transformer windings II Winding of single-phase transformers, connection of transformers in various circuits Three-phase transformer Laboratory studies, Yy, Dy, Yd and Yz connections Three-phase motor winding I Three-phase motor - single-layer basket winding, 24 slots, 2-pole, series connection Induction motors I Design and characteristic curves for three-phase asynchronous motor with cage rotor Control engineering I Pole-changing contactor circuit with Dahlander winding 1 of 5

2 Control engineering II Pole-changing, reversing with programmable controller based on the example of a gantry crane travelling crab Slip-ring motor I Laboratory work on 4-pole three-phase motor, single-layer winding, parallel connection with 24 slots Static and dynamic rotor balancing Balancing of rotors of different sizes using different techniques Power electronics I Use and applications of power diodes and power transistors, thyristors, thyristor thermostat Three-phase motor winding VI Winding and connection of asymmetrical and symmetrical fractional-slot and Dahlander winding Series motor I (repulsion motor) Design and production of a stator with winding and rotor DC stator winding I Winding of excitation winding and commutator poles, banding and impregnation of windings DC motors Study of DC motors and DC shunt-wound machine Universal motor Single-phase series motor in AC and DC operation, load characteristic curves Rectifier circuits Half-wave, full-wave and bridge rectifier circuit with and without smoothing Workshop Technology Title and topics of HKSE Resistor circuits II Extended series and parallel connection, series-parallel connection, voltage divider Electro-heat Temperature and heat, electric heaters, efficiency of electric heaters Voltage generator Voltage sources under load, series and parallel connection of voltage sources Magnetic field Permanent magnetism, electromagnetism, basic magnetic quantities Protective measures as per VDE 0100 VDE specifications, network configurations, system-dependent and non system-dependent protective measures AC transformer II Transformer under various loads, transformer designs, instrument transformer Transformer windings Design of windings, cylindrical winding, disk winding, taps Three-phase transformer I Introduction, designs, core laminations, lamination schemes, applications Three-phase transformer II Laws, vector groups, applications and examples Semi-conductor diodes Characteristic curves, characteristic data, half-wave rectification, bridge circuit 2 of 5

3 Three-phase transformer III Unbalanced load, three-phase variable-ratio transformer, representation and applications Three-phase asynchronous motor I Design of stator and rotor, rotating field formation, mode of operation, slip Starting procedures for three-phase asynchronous motors Star-delta starter, stator starter, rotor starter Speed control for three-phase asynchronous motor Pole-changing motors, frequency control, slip control Alternator Power station alternator, performance, parallel operation, standby power source, frequency converter Three-phase asynchronous motor windings Two and multi-pole windings, single and double-layer windings, group and basket windings Special transformers Toroidal variable-ratio transformer, high-reactance transformer, design and operation Special motors Universal motor, stepper motor, frequency converter, applications and examples Workshop Calculation Title and topics of HKSE Trigonometry I Right-angled triangle, Thales's circle, Pythagoras's theorem Resistance Ohm's law, conductance, conductor resistance, current density, resistance and temperature Resistor circuits I Series connection, parallel connection, measuring range extension Capacitor I Capacitance, parallel connection, series connection, project planning Induction Coil inductance, induction voltage, series and parallel connection of inductances AC circuit I Equivalent resistance, inductive reactance, capacitive reactance Transformer I Voltage transformation, current transformation, loss and efficiency Calculations for miniature transformer Power and core cross-section, number of turns, currents and wire cross-sections Three-phase AC current I Star connection, delta connection, applications and exercises Three-phase transformer I Currents and voltages, power and loss, wire and core cross-sections Semi-conductor diodes Voltage values for rectifiers, filtering, Zener diode Efficiency calculations for electric motors Energy conversion, efficiency, power factor, determination of efficiency Starting procedures for three-phase asynchronous motor Starting currents and voltages, resistance and power, reduced starting torques 3 of 5

4 Excitation windings of DC machines Series connection of field coils, parallel connection of field coils, wire lengths, wire weights Three-phase wiring under load Voltage drop, power loss, applications and exercises Engineering Drawing Title and topics of HKSE Representation of cylindrical objects Dimensioning of cylindrical objects, additions to partial views and entry of dimensions Holes and threads Holes and slots, threads and screws, representation and entry of dimensions Lamp circuits with installation switches I On/off circuit, series connection, additions and representation, project planning Signalling techniques Loudspeaker systems, intercom systems, project planning Building wiring installation Graphical symbols for building wiring installation, simple wiring diagrams taking kitchen as an example Switchgear I Cam-operated and key-operated switches, circuit breaker, hot plate circuit, electric cooker Rotation indicator Drawing of electronic circuit for rotation indicator Three-phase transformer I Circuits with star and delta connection, zigzag connection, parallel operation Three-phase windings I Winding drawing, development, number of poles, representation and exercises Starting circuit for single-phase asynchronous motors Single-phase motor with starting and running capacitor, Steinmetz circuit, auxiliary starting winding Braking with motors Brake motors, braking with asynchronous motors, braking with DC motors Synchronous machines Starting circuit for synchronous motor, motor-generator set connection Emergency generating set Alternator (synchronous generator), induction generator, emergency generating set Material Technology Title and topics of HKSE NTC, PTC, VDR PTC thermistor, NTC thermistor, characteristic quantities, designs, voltage-dependent resistor (VDR) Plastics I Thermoplastic and thermosetting materials, elastomers, basic principles, structure, applications 4 of 5

5 Insulating materials I Requirements, inorganic insulating materials, natural organic insulating materials Magnetic materials Properties of magnetic materials, magnetically soft and magnetically hard materials Cables and wires I Colour coding, insulated wires, practical applications and examples Electrical connections Contact points and types of contact, non-permanent connections, permanent connections Semi-conductor physics I Crystal structure, intrinsic conduction, energy band model, experiment drawings Resistor and heating conductor materials Resistor materials, carbon, heating conductor alloys, applications and examples 5 of 5

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