UEENEEG006A Question Paper Assignment
Unit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 1 of 19 – WPA 1
| Student Name: | Student signature: |
| Assessor’s Name: | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
| Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant section in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk Any student found gaining unfair advantage by copying from other students will face disciplinary action All questions must be attempted – answers to be written on this paper All drawings must be neat and legible – If you make a mistake, use attached additional sheet Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
Transformer Construction
a) Provide sketches and a written explanation on the construction of cores used in single phase, three phase, auto and instrument transformers (cover core and lamination shapes, and materials used)
b) Describe three different winding styles/types used in transformers
c) State the materials/methods used to insulate transformers (eg. for LV, HV, dry and immersed)
d) Describe the construction of transformer tanks and fittings for distribution transformers
e) List six pieces of information stated on transformer nameplates – for each, give a brief description and/or an actual example
f) Explain how to perform basic insulation resistance, continuity and winding identification tests
Additional Sheet – If required
U nit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 2 of 19 – WPA 2
| Student Name: | Student signature: |
| Assessor’s Name: Paul Howson | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
| Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant section in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk Any student found gaining unfair advantage by copying from other students will face disciplinary action All questions must be attempted – answers to be written on this paper All drawings must be neat and legible – If you make a mistake, use attached additional sheet Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
Transformer Operation
a) Describe the principle of mutual induction of a transformer
b) State the formula and describe the factors that determine the induced voltage in a transformer winding
c) State and briefly explain the formulas required to calculate the value of a transformers secondary voltage and current given one winding’s electrical details and turns ratio
d) Draw and label a phasor diagram showing the voltage and current components for a transformer on NO-LOAD. Include a key to explain each quantity eg. V1 = Primary Voltage etc.
e) Using a phasor diagram, describe how power is transferred from the primary to secondary when a load is connected neglecting impedance drops. State the formulas for primary and secondary power
f) State the four categories of transformers used in specific applications; provide a short explanation or give examples of each
g) State the clause in AS/NZS 3000 covering transformers. State four types of transformers that are exempt and three types that are specified, with their clause numbers
Clause: ______________
Exempted types:
Specified transformers & clauses:
Additional Sheet – If required
U nit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 3 of 19 – WPA 3
| Student Name: | Student signature: |
| Assessor’s Name: Paul Howson | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
| Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant section in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk Any student found gaining unfair advantage by copying from other students will face disciplinary action All questions must be attempted – answers to be written on this paper All drawings must be neat and legible – If you make a mistake, use attached additional sheet Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
Transformer losses, efficiency and cooling
a) Describe the two main power losses which occur in a transformer
b) Describe the two tests which allow the power losses of a transformer to be calculated
c) State the formula required to calculate total transformer losses at full load, in terms of losses. Also, state a formula for efficiency in terms of input power and losses. Using suitable values, demonstrate the use of both formulas
d) Describe the methods/mediums used for natural and forced cooling of transformers; comment on the letter designations
e) Describe the relationship between transformer cooling and rating; comment on multiple ratings
f) Describe four properties of transformer oil
g) List six tests conducted on transformer oil
h) Describe two tests conducted on transformer oil
Additional Sheet – If required
U nit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 4 of 19 – WPA 4
| Student Name: | Student signature: |
| Assessor’s Name: Paul Howson | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
| Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant section in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk Any student found gaining unfair advantage by copying from other students will face disciplinary action All questions must be attempted – answers to be written on this paper All drawings must be neat and legible – If you make a mistake, use attached additional sheet Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
Transformer voltage regulation and percent impedance
a) Describe the term voltage regulation as applicable to a transformer
b) Explain the voltage variation with load, in the output of a transformer (mention Z and losses)
c) Give an example of how to calculate the voltage regulation of a transformer by the following two methods:
(i) Using typical secondary voltage values – write the formula and state the meaning of each variable
(ii) Using typical R% and X% values, with a pf of 0.9 lag and a pf of 0.9 lead
d) Explain the term percentage impedance as applied to transformers
e) Briefly describe two uses for Z%
f) Describe the test and method used to determine the percent impedance – provide a diagram
g) Give an example of how to calculate the percent impedance of a transformer, using any typical values – write the formula and state the meaning of each variable
Additional Sheet – If required
U nit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 5 of 19 – WPA 5
| Student Name: | Student signature: |
| Assessor’s Name: Paul Howson | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
| Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant section in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk Any student found gaining unfair advantage by copying from other students will face disciplinary action All questions must be attempted – answers to be written on this paper All drawings must be neat and legible – If you make a mistake, an extra sheet can be attached Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
Auto-transformers and instrument transformers
a) Draw the circuit symbols for an auto-transformer, voltage transformer and current transformer
b) State the formulas required for calculating all the voltages and currents in an auto-transformer
c) List at least two advantages and one disadvantage of an auto-transformer
d) Describe the basic construction of voltage transformers
e) State the standard secondary voltage, and the name and typical range of ratings of VT’s
f) Describe the basic construction of current transformers
g) State the standard secondary current, and the name and typical range of ratings of CT’s
h) List the precautionary measures taken to connect and disconnect instrument transformer meters
i) Draw a circuit diagram with a CT, VT, Ammeter and Voltmeter in the same circuit
j) List at least two applications for auto-transformers and two for instrument transformers
Additional Sheet – If required
U nit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 6 of 19 – WPA 6
| Student Name: | Student signature: |
| Assessor’s Name: Paul Howson | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
| Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant section in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk Any student found gaining unfair advantage by copying from other students will face disciplinary action All questions must be attempted – answers to be written on this paper All drawings must be neat and legible – If you make a mistake, use attached additional sheet Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
Parallel operation of transformers
a) Draw a diagram to show the polarity dots (same instantaneous polarity) on the primary and secondary of a single-phase transformer. Also show the alpha-numeric terminal markings
b) Explain by the use of circuit diagrams and formulas how the polarity of a single phase transformer can be determined
c) Explain the need for parallel operation of transformers
d) List four conditions required before two single-phase transformers can be connected in parallel
e) Draw a circuit diagram showing two single phase transformers connected in parallel supplying a single load (show polarity markings, supply and load)
f) Describe the effect of connecting the secondaries of two single phase transformers in parallel (as the previous question), if they are out-of-phase
g) State the function and briefly comment on the following pieces of transformer auxiliary equipment:
(i) Bushings
(ii) Surge-diverters
(iii) Tap-changers
(iv) Oil Temperature Indicator
(v) Winding Temperature Indicator
(vi) Buchholz Relay
Additional Sheet – If required
U nit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 7 of 19 – WPA 6A PRACTICAL
| Student Name: | Student signature: |
| Assessor’s Name: Paul Howson | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
| Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant section in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk Any student found gaining unfair advantage by copying from other students will face disciplinary action All questions must be attempted – answers to be written on this paper All drawings must be neat and legible – If you make a mistake, use attached additional sheet Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
PRACTICAL
Equipment: Single phase transformer (in grey plastic box) x 2, Multimeter x 2, Insulation Tester, Power Meter, 24 volt 15W lamp x 2, 2 Amp Circuit Breaker x 1, Connection leads, Module Notes
a) Insulation and continuity
Perform both tests, showing your actual meter readings below, and provide a written justification of why the transformer is in a safe/suitable condition for connection to the supply:
Insulation:
Continuity:
Justification (in words):
b) Transformation ratios
(i) Connect the transformer primary to 10 VAC, measure and record the secondary voltage:
______V Calculate the voltage ratio – show the formula and your workings:
ANSWER
HERE>>>
(ii) Connect a lamp to the transformer secondary, measure and record the primary and secondary currents: Primary _____A Secondary _____A
Calculate the current ratio – show the formula and your workings:
ANSWER
HERE>>>
c) Polarity (Single Transformer)
(i) Use 10 VAC on the primary. Perform a phasing check (as described in your notes), with both windings in phase. Note the voltmeter reading: _____V
Confirm your connection by calculation (eg. Use V = VP – VS or V = VP + VS):
ANSWER
HERE>>>
(ii) Now connect the windings in the opposite way (out of phase)
Note the voltmeter reading: _____ V Confirm your connection by calculation:
ANSWER
HERE>>>
d) Regulation
Set the primary voltage to 40 VAC and connect two 24 volt lamps in parallel as a load. Calculate the percentage voltage regulation, show all your workings
VFL = ___________ V VNL = ___________ V
V% regulation =
e) Iron losses, copper losses and Impedance
Set the primary voltage to 40 VAC – with no load on the secondary, measure the power dissipated in the primary and make a note of it below:
Fe Loss: ___________ W
WARNING: Adjust Variac supply to ZERO VOLTS – NOW!!!
Assume the rated primary voltage is 41.5 VAC and the rated primary current is 0.75 A
Connect the power meter, ammeter and voltmeter into the primary circuit and short-circuit secondary.
SLOWLY increase the primary voltage until the rated primary current is reached (0.75 A)
Enter the readings of power and voltage below:
Cu Loss: ___________ W Z% = Impedance Voltage (VSC) x 100 = _________ x 100 = _______%
Rated Voltage 40
f) Parallel Operation
WARNING: Ensure the secondaries are connected together with the SAME POLARITIES!!!
1. Use the two transformer method of checking polarities (page 93)
2. Connect the circuit breaker to either secondary
3. Using a primary voltage of 20 VAC and two parallel connected lamps as a single load, carefully connect two transformers in parallel to supply the load. Measure and record the secondary currents:
Transformer A: ____________ Amps Transformer B: _____________ Amps
Additional Sheet – If required
U nit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 9 of 19 – WPA 7
| Student Name: | Student signature: |
| Assessor’s Name: Paul Howson | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
| Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant section in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk Any student found gaining unfair advantage by copying from other students will face disciplinary action All questions must be attempted – answers to be written on this paper All drawings must be neat and legible – If you make a mistake, use attached additional sheet Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
Operating principles of 3 phase induction motors
a) Explain the following rules (draw a diagram if necessary) to show how circuit operating characteristics can be determined
(i) Right-hand grip rule for conductors
(ii) Right-hand grip rule for solenoids
(iii) Fleming’s left-hand
(iv) Fleming’s right-hand
b) List the characteristics (eg. Rotating or pulsating and strength) of the magnetic field produced by single, and three phase windings
c) Give an example of how to calculate the speed of rotation of a rotating magnetic field – make up values and define each term used in the equation
d) Describe the relationship between the rotor speed, slip and rotor frequency
As the rotor speed increases…
When the rotor is stationary…
e) Describe the basic principle of operation of an induction motor
f) Explain how to reverse the direction of rotation of a three phase induction motor and state what changes within the motor (apart from rotor direction)
Additional Sheet – If required
U nit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 10 of 19 – WPA 8
| Student Name: | Student signature: |
| Assessor’s Name: Paul Howson | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
| Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant section in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk Any student found gaining unfair advantage by copying from other students will face disciplinary action All questions must be attempted – answers to be written on this paper All drawings must be neat and legible – If you make a mistake, use attached additional sheet Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
Three-phase induction motor construction
a) State the names and describe the basic function and physical appearance of the two main parts of an induction motor (use a labelled sketch if preferred)
b) State the two main types of rotors used in three-phase induction motors and briefly describe the construction of each (use a labelled sketch if preferred)
c) Draw and label two six-terminal blocks: one showing the external connections for star operation, the other for delta. Show and label the supply connections in each diagram
d) List the steps for removing from service and dismantling a three-phase induction motor for maintenance
e) (i) Describe how you would check the insulation resistance of a three-phase induction motor prior to connection to the supply
(ii) State the value below which the insulation resistance test would be failed; also, state the expected/desirable insulation resistance values for a serviceable motor
f) (i) Describe how you would check the winding resistance of a three-phase induction motor, with a six-terminal block in both star and delta
(ii) State a range of typical stator winding resistance values for a serviceable motor
Additional Sheet – If required
U nit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 11 of 19 – WPA 9
| Student Name: | Student signature: |
| Assessor’s Name: Paul Howson | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
| Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant section in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk Any student found gaining unfair advantage by copying from other students will face disciplinary action All questions must be attempted – answers to be written on this paper All drawings must be neat and legible – If you make a mistake, use attached additional sheet Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
Three-phase induction motor characteristics
a) Describe the information that can be obtained from speed/torque curves – and draw/label a curve
b) List the operating characteristics of squirrel cage and wound rotor motors
PROS CONS
Squirrel Cage:
Wound Rotor:
c) State three operating characteristics that can be found on a motor nameplate
NOTE: Operating Characteristics are not to include – voltage and frequency rating, no. of phases, type of motor or connection
d) Explain in words how the efficiency of an induction motor can be calculated from measured values of motor rpm, torque and power input; and give an example (TIP: make up values of rpm, T and PIN)
e) Explain MEPS as applicable to three phase induction motors
f) Describe four typical motor faults (mention: nature of fault, causes, motor performance, tests etc)
Additional Sheet – If required
U nit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 12 of 19 – WPA 10
| Student Name: | Student signature: |
| Assessor’s Name: Paul Howson | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
| Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant section in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk Any student found gaining unfair advantage by copying from other students will face disciplinary action All questions must be attempted – answers to be written on this paper All drawings must be neat and legible – If you make a mistake, use attached additional sheet Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
Single phase motors – split phase
a) List five common types of single phase motor
b) Explain the principle and method of starting a split phase induction motor; and provide relevant sketches (eg phasor diagram etc)
c) Explain the physical construction of a split phase induction motor (eg type of winding etc) and provide relevant sketches (eg showing actual position of poles/windings etc)
d) Draw and label a speed/torque
curve showing both windings
of a split phase motor:
e) Outline the basic characteristics, advantages/disadvantages and typical ratings of a split phase induction motor
f) List at least five applications of split phase induction motors
g) Explain how to connect, run/reverse a split phase induction motor (use a circuit diagram if required)
h) List three typical faults and testing procedures for these faults for a split phase induction motor
Additional Sheet – If required
U nit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 13 of 19 – WPA 11
| Student Name: | Student signature: |
| Assessor’s Name: Paul Howson | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
| Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant section in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk Any student found gaining unfair advantage by copying from other students will face disciplinary action All questions must be attempted – answers to be written on this paper All drawings must be neat and legible – If you make a mistake, use attached additional sheet Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
Single phase motors – capacitor and shaded pole types
a) Draw a diagram (showing windings etc) and explain the principle of operation (phase displacement, magnetic field, switched components etc) of the following single phase induction motors:
(i) Capacitor start (CSIR)
Circuit diagram: Principle of operation:
(ii) Capacitor start/capacitor run (CSCR)
Circuit diagram: Principle of operation:
(iii) Permanent split capacitor (PSC)
Circuit diagram: Principle of operation:
(iv) Shaded pole
Circuit diagram: Principle of operation:
b) List the operating characteristics (eg torque, reliability, speed control etc), method of reversal and typical applications of each motor type listed:
(i) Capacitor start (CSIR)
(ii) Capacitor start/capacitor run (CSCR)
(iii) Permanent split capacitor (PSC)
(iv) Shaded pole
c) Describe four common motor faults (eg name faulty component, symptoms of fault), and describe testing procedures to identify these faults
Additional Sheet – If required
U nit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 15 of 19 – WPA 12
| Student Name: | Student signature: |
| Assessor’s Name: Paul Howson | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
| Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant section in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk Any student found gaining unfair advantage by copying from other students will face disciplinary action All questions must be attempted – answers to be written on this paper All drawings must be neat and legible – If you make a mistake, use attached additional sheet Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
Single phase motors – universal
a) List and state the function of each of the basic parts of a series universal motor
b) Explain the basic principle of operation (magnetic fields, commutation etc) of a series universal motor
c) List the types of supply and operating characteristics (torque, speed etc), for a series universal motor
d) State typical uses for series universal motor and explain why this type of motor is suitable
e) Explain how to connect, run and reverse a series universal motor (use a diagram if required)
f) List common series universal motor faults, and possible causes
Additional Sheet – If required
U nit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 16 of 19 – WPA 13
| Student Name: | Student signature: |
| Assessor’s Name: Paul Howson | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
| Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant section in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk Any student found gaining unfair advantage by copying from other students will face disciplinary action All questions must be attempted – answers to be written on this paper All drawings must be neat and legible – If you make a mistake, use attached additional sheet Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
Motor protection
a) State the two main reasons why motor protection is required and include a list of common faults leading to overload
b) List the clause numbers from AS/NZS3000 Wiring Rules with regard to motor protection and briefly summarize some of the main points
c) Describe the difference between the two common types of motor over temperature devices
d) Describe the operating principle of thermal and magnetic motor protection devices
e) Describe the electrical features of motor protection fuses
f) Describe the effects of under voltage and over voltage on motors and motor circuits
g) State the effects of repetitive starting and/or reversing on motors
h) State the special requirements for motor protection, in:
(i) high humidity or moist environments
(ii) high temperature areas
(iii) corrosive atmospheres
i) Describe the overload implications of single phasing and operating principles of phase failure protection
Additional Sheet – If required
U nit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 17 of 19 – WPA 14
| Student Name: | Student signature: |
| Assessor’s Name: Paul Howson | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
| Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant section in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk Any student found gaining unfair advantage by copying from other students will face disciplinary action All questions must be attempted – answers to be written on this paper All drawings must be neat and legible – If you make a mistake, use attached additional sheet Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
Three phase synchronous machines – operating principles
a) Draw a power transfer diagram of an ac synchronous generator
b) Explain the need for the generation of a sinusoidal waveform
c) State the principles of operation of a synchronous alternator
d) State the principles of operation of a synchronous motor
e) State the principles of operation of an asynchronous generator (induction generator)
f) Describe the main parts of a synchronous alternator/motor
g) Describe two methods used to provide the excitation of a synchronous alternator/motor
h) Draw a block diagram of an alternator voltage regulator
i) List the advantages gained by parallel operation of alternators
j) List the starting methods of synchronous motors
Additional Sheet – If required
U nit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 18 of 19 – WPA 15
| Student Name: | Student signature: |
| Assessor’s Name: Paul Howson | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
| Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant section in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk Any student found gaining unfair advantage by copying from other students will face disciplinary action All questions must be attempted – answers to be written on this paper All drawings must be neat and legible – If you make a mistake, use attached additional sheet Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
Alternators and generators
a) Explain the effect on the generated voltage of variations in excitation (tip: see formula for VPHASE)
b) State the effect on generated voltage of variations in load (resistive, inductive and capacitive)
c) Draw and label the load and no-load characteristic curves of an alternator
d) State the function and list the types of prime movers used with single and three phase portable/standby alternators
e) List the steps to follow for the manual starting/operation of single and three phase portable/standby alternators
f) State the three types and range of ratings of single and three phase alternators
g) List the applications of single and three phase portable and standby alternators
h) Describe the construction details of single and three phase portable/standby alternators
i) List the common faults found in portable/standby alternators
Additional Sheet – If required
U nit Number – UEENEEG006A
Unit Name – Solve problems in single and three phase low voltage machines
Assessment event 19 of 19 – WPA 15A PRACTICAL
| Student Name: | Student signature: |
| Assessor’s Name: Paul Howson | Date: |
Each of the 19 assessment events must be successfully completed in order to demonstrate competence in this unit
Instructions to Students This Work Progress Assessment (WPA) can only be started after your teacher has verified your satisfactory completion of some/all of the Review Questions and Student Exercises for the relevant sections in the Module Book – as they are part of your assessment These projects are not graded; they are assessed as either ‘satisfactory’ or ‘not yet satisfactory’ All 19 WPA’s must be assessed as ‘satisfactory’ to successfully complete this unit; as described in the UAG As a guide only, it is anticipated that a WPA will take an average student at least one hour to complete This is an open-book assessment (any resources may be used) and should be all YOUR OWN work – Do NOT allow your WPA to leave your desk All questions must be attempted Each WPA must be completed and handed-in for assessment at the END OF EACH SESSION |
| Teacher’s Assessment: | Satisfactory | Not Yet Satisfactory |
| Feedback / Adjustment: | ||
| Notes: | ||
| Teacher’s Initial: |
Required Skills and Knowledge – from unit guide
Ref: KS02-EG006A Alternating current rotating machines
Your teacher will sign each individual box below, if the seven exercises are completed at different times. Or sign the final box, if all exercises are completed at the same time.
- Test the insulation resistance of a three-phase induction motor prior to connection to the supply (T2)
| Satisfactorily Completed | Date: | Teachers Initials: |
- Test winding resistance (ohmic value and continuity) of a three-phase induction motor prior to connection to the supply (T2)
| Satisfactorily Completed | Date: | Teachers Initials: |
- Connect a three-phase induction motor in both star and delta (T2)
| Satisfactorily Completed | Date: | Teachers Initials: |
- Reverse the direction of rotation of a three-phase induction motor (T1)
| Satisfactorily Completed | Date: | Teachers Initials: |
- Describe the process for dismantling a three-phase induction motor (T2)
| Satisfactorily Completed | Date: | Teachers Initials: |
- Connect, run and reverse a split phase induction motor (T4)
| Satisfactorily Completed | Date: | Teachers Initials: |
- Connect, run and reverse a series universal motor (T6)
| Satisfactorily Completed | Date: | Teachers Initials: |
| All Seven Satisfactorily Completed | Date: | Teachers Initials: |
