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School > H1gh V0ltage > Flashcards

H1gh V0ltage Flashcards

1
Q

Line that connects between generating station and next substation XFMR

A

Transmission line

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2
Q

According to IEEE what voltage is medium voltage?

A

2.4kv-69kv

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3
Q

Between what voltage utility companies generate

A

10kv-20kv

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4
Q

Invisible field of force that surrounds conductors

A

Electrostatic Field

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5
Q

Name given to electrostatic field with flux density from centre

A

Voltage gradient

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6
Q

Cleaning insulator bushings diminish

A

Creepage distance and tracking

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7
Q

Insulation used on power equipment must withstand

A

Basic impulse insulation level

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8
Q

Which high voltage distribution system offers supply from 2 directions

A

The ring system

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9
Q

According to CEC what is the minimum working space around 45kv equipment

A

2.5M

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10
Q

How are lightning arresters connected on lines

A

In parallel with each phase to ground

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11
Q

How does series reactor limit current or choke current

A

By increasing its inductive REACTANCE

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12
Q

500/5 c.t has 4 loops secondary reads 5 amps what is primary

A

125a

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13
Q

What would best selection of a c.t if primary between 350-400amps

A

500/5

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14
Q

What is best VT ratio if primary is 230V

A

1100/1

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15
Q

Key interlocking is a system designed

A

Offer protection to equipment and personnel

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16
Q

What is the steps in order to a safe switching procedure

A 
Disconnect 
Lockout
Test
Ground
Screen off
17
Q

What is the minimum safe working distance from 250kv line

A

15ft

18
Q

According to CEC do VT’s require overprotection on supply side

A

Yes must have over current protection and disconnecting means

19
Q

On gang operated switch handles, according to CEC

A

1.2M X 1.8M

20
Q

According to CEC what is tolerable touch voltage on dry soil

A

405v

21
Q

The ability of dielectric for HV cable to withstand breakdown

A

Dielectric strength

22
Q

What is primary purpose of strand shields

A

Remove flux lines in air voids

23
Q

Which termination class is approved for indoor termination

A

Class 1

24
Q

According to CEC shielding is required over all thermoset insulated cables

A

5000V

25
Q

What is the bending radius of 45mm aluminum

A

675mm

26
Q

Are we allowed to install HV cables in elevator shafts.

A

Yes in conduit in 50mm concrete

27
Q

Which type of switches can interrupt small load currents

A

Horn gap switch

28
Q

Which switch uses hotstick

A

Isolating

29
Q

What type of HV fuse is non-expulsion type

A

Current- limiting

30
Q

What determines the short circuit current

A

Transformer % impedance

31
Q

What provides force to close contacts

A

Charged springs

32
Q

Which HV breaker may close its contacts more than once automatically

A

Recloser breakers

School (9 decks)

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