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Electrical Theory Substations > Deck 1 > Flashcards

Deck 1 Flashcards

1
Q

Name the basic unit of electrical current.

A

Amp.

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2
Q

What is the instrument used to measure an electrical resistance?

A

Ohmmeter

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3
Q

What is used to measure electrical current?

A

Ammeter.

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4
Q

Name the pressure that forces electrons to flow through a circuit.

A

Voltage.

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5
Q

Voltage of a standard car battery.

A

12.6 Volts

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6
Q

What is the voltage at a domestic socket outlet?

A

230 Volts

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7
Q

What is the basic unit of resistance?

A

Ohms.

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8
Q

Name the two electrical conductors used in cables.

A
  1. Copper

2. Aluminium

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9
Q

Out of Copper and Aluminium, which has the greater current carrying capacity?

A

Copper.

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10
Q

What is the minimum amount of amps required to be fatal from an electric shock?

A

30 milliamperes (mA)

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11
Q

Name the electrical insulators used within PILC cables.

A

Belt Papers

Impregnated Papers

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12
Q

Name the electrical insulators in modern cables.

A

PVC Insulation

Xple Insulation

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13
Q

What does an electrical insulators do?

A

Protection from live metal work and conductors.

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14
Q

What is the national standard for phasing on LV?

A

1 2 3

Red Yellow Blue

Brown Black Gray

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15
Q

What do you use to check and confirm the LV network phasing at a substation?

A

Phase Rotation Meter.

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16
Q

What is the phasing for HV networks? 11kv & 20kv.

A

11kv = 1 2 3

20kv = 3 2 1

17
Q

What does PME mean?

A

Protective Multiple Earth.

18
Q

Can a neutral in an electrical system carry current?

A

Yes.

19
Q

Why is the neutral in a three-phase cable the same size or smaller than the phase?

A

Because it doesn’t carry the same amount of load that the phases do.

20
Q

Scenario:

PILC cable with no phase numbers and only faded colours, how do you determine the neutral core?

A

Phase check with the test lamps, searching for the core that gives no light when connected to the lead earth.

21
Q

When making a new cable live what tests do you carry out beforehand?

A
  • continuity test

- insulation resistance test

22
Q

What is the most important item in a cable pot end and what does it do?

A

The earth.

Provides a return path for a fault current.

23
Q

What is a PME system?

A

A earthing system that is combined with a neutral and uses multiple earth electrodes.

24
Q

What is a neutral?

A

The return path for the current, goes back to the star point of the transformer LV board. Exists to complete the circuit allowing the current to flow.

25
Q

What is the name for the flow of electrons within an electrical circuit?

A

Current.

Electrical Theory Substations (1 decks)

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