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-SQA- SCOTTISH QUALIFICATIONS AUTHORITY HIGHER NATIONAL UNIT SPECIFICATION GENERAL INFORMATION -Unit Number- 2400040 -Superclass- XJ -Title- Electrical Principles -DESCRIPTIONGENERAL COMPETENCE FOR UNIT: Applying electrical principles to transmission line, steady state and transient circuit problems. CREDIT VALUE: 1 ACCESS: Access to this Unit is at the discretion of the Centre. However, it would be beneficial, if the student had a knowledge of fundamental circuit theorems, Ohms's and Kirchhoff's laws and alternating circuit theory. This may be evidenced by possession of: National Certificate Modules 2160030 Single Phase A.C., 2160080 Network Analysis and 2160090 D.C. and A.C. Circuit Responses or similar qualifications or experience. Unit No.2400040 Continuation OUTCOMES AND PERFORMANCE CRITERIA OUTCOME 1 Apply complex notation to phasor quantities. PERFORMANCE CRITERIA (a) Performance of addition, subtraction and multiplication using cartesian and polar expressions is correct. (b) The conjugate of a complex quantity is applied to the division of complex numbers correctly. (c) Phasor quantities are accurately expressed mathematically and displayed diagrammatically in cartesian and polar form with respect to a reference phasor in any quadrant. OUTCOME 2 Solve a.c. network problems using complex notation. PERFORMANCE CRITERIA (a) Complex notation is correctly applied to impedance, voltage, current and power components. (b) Voltages, currents, power factor and all power components are accurately calculated for a series circuit containing one resistor, one inductor and one capacitor, and a parallel network with two branches, one having an inductor and resistor connected in series and the other having a single capacitor. (c) Currents, voltages, power and power factor in a series-parallel network are accurately measured and recorded. OUTCOME 3 Evaluate the response of a circuit to a transient disturbance. PERFORMANCE CRITERIA (a) The responses of RL and RC series circuits, to both the application and removal of a direct voltage, are correctly predicted and the formulae for one condition are accurately described. (b) The response curves of RL and RC series circuits, to both the application and removal of a d.c. voltage are drawn correctly. (c) The responses of RL and RC series circuits, to the application of a sinusoidal voltage are correctly predicted for specified conditions and the formulae for one condition are accurately described. (d) The labelled waveform sketch showing the response of an RL or RC series circuit to the application of a sinusoidal waveform is correct. Page 2 of 4 Unit No.2400040 Continuation OUTCOME 4 Evaluate the performance of transmission lines using distributed parameters. PERFORMANCE CRITERIA (a) The secondary parameters (characteristic impedance Z 0 , propagation coefficient γ, attenuation coefficient α, phase shift coefficient ß, wavelength λ, velocity of propagation u) of a transmission line are correctly calculated from given primary parameters. (b) Voltage and current, at a given distance from the sending and receiving end of a transmission line, are correctly calculated using given formulae. (c) The incident, reflected and transmitted values of voltage, current and power for a source and matched line of characteristic impedance Z 0 terminated in an impedance Z L are correctly calculated for the case where Z L is greater than Z 0 and the case where Z L is smaller than Z 0 . (d) Z L = ∞, Z L 〉 Z 0 , Z L 〈 Z 0 and Z L = 0 Page 3 of 4 Unit No.2400040 Continuation CONTEXT The following information gives further clarification regarding the context in which the outcomes and performance criteria are to be achieved. Corresponding to the Outcomes: 2. Performance criterion (a): power components are: apparent power, reactive power and real power. 4. Performance criterion (b), calculations are performed by application of the formulae: v χ = Vs e − χ y and i χ = I s e − χ y where χ is the distance from the sending end and v χ = Vr e χy and i χ = I r e χy where χ is the distance from the receiving end AWARD OF PASS A student who achieves all performance criteria for all outcomes will be awarded a Pass in the Unit. AWARD OF PASS WITH MERIT Pass with Merit may be awarded to a student who achieves all outcomes and in so doing consistently demonstrates superior performance when, for example: (a) relating theory to practice; (b) performing calculations. Copyright SQA 1990 20/12/01 Page 4 of 4