Fault Finding And Protective Devices N6 — Memo

November 2023 — N6 — Fault Finding And Protective Devices

N6 2023 Nated Engineering

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Q1— Section header —

1.1Floating charge it is when a battery is continually connected to load and is designed to maintain voltage constant throughout its load range. The voltage to the battery should supply sufficient current to the battery to overcome

Q2— Section header —

2.1It is only suitable for long lines. On a short line, the resistance of the arc at the fault may be comparable with the impedance of the line itself. The fault then seems to be further away from the relay than

2.2rotection relay is a relay design to initiate disconnection of a part of an electrical installation or to operate a warning signal in the case of fault or other abnormal condition in the installation.

2.3ny correct label 4 marks orrect sketch 4 marks (8\

2.4100% urrent setting = 5 A in relay 1,3 factor = 6,5 A in relay = CT ratio relay current = 400/5

Q3— Section header —

3.1Impulse voltage dry test ower frequency voltage dry test Temperature dry test Short circuit test Making and braking test Mechanical operation test (6\

3.2The main purpose is to provide safety to operating and maintenance staff and also to prevent wrong sequenc ing of switching operators. (3\

3.3ircuit breaker is an automatically operated electrical switch caused by overload or short circuit. Its purpose is to detect an abnormal fault condi tion and interrupt current (6\

Q4— Section header —

4.1ny correct label 4 marks orrect sketch 3 marks (7\

4.2Slow gas leak (3\

4.4Spark overvoltage test Operating duty test Surface check for pollution Surface contamination test Test for unipolar oscillation switching impulse voltage (6\ [18]18

Q5— Section header —

5.1Earth fault Open circuit (3\

5.2Before cutting the cable it must be de energi good method to ensur energi ation is through the spike method. The spike method is a safety

5.5sm /6,100 20122 =NOW: sm Velocity /3,50 6,100 Distance of fault (lx\

Q6— Section header —

6.1Amplifier with two inputs fr om amplifies signals Converts amplifier vol tage output into trigger pulses

6.2Provide control of timing of pulses. Ensure that there is no or little time delay between the change in the control signal and the change in

Mark Allocation

Sections19 + 21 + 15 + 18 + 13 + 14 = 100 marks

Paper information

TitleMemo

SubjectFault Finding And Protective Devices

LevelN6

Document typeNated Engineering

Year2023

MonthNovember

Pages5

Downloads4

Examination context

Decade2020s

Years ago3y

SeasonSpring (SH)

Start dayWednesday

Exam periodNovember 2023

Days since exam1,076

About Fault Finding And Protective Devices examination preparation

This TVET examination resource can be used as part of a structured revision programme. Past papers are most useful when learners attempt questions independently, work within a realistic time limit, and review their answers afterwards.

How to use this resource for revision

A TVET past examination paper is most useful when it is treated as an active revision exercise. Try the questions yourself before checking the corresponding memorandum. Where you make an error, identify the reason — was it a knowledge gap, a calculation mistake, an interpretation issue, or an examination technique problem?

For stronger examination practice, complete the paper without unnecessary interruptions and keep track of the questions that take the most time. Afterwards, review the memorandum and separate knowledge gaps from mistakes caused by interpretation, calculation, structure, or examination technique.

understanding question requirements

applying subject knowledge

working under time constraints

checking answers

identifying revision priorities

A practical revision approach

Start by completing the resource without looking at the memorandum. Review incorrect and incomplete answers afterwards and make a short revision list based on the areas that caused difficulty.

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