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HV Switching > Questions > Flashcards

Questions Flashcards

1
Q

Reasonably practicable

A

Balance of risk against cost, risk assessment , control measures

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2
Q

Define Isolation

A

Disconnection and separation from every source of electrical energy in such a way that the disconnection and separation is secure

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3
Q

Where on the body is the point of highest electrical resistance

A

Dry skin

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4
Q

If your proving unit fails what can you do?

A

Get another unit or do not carry on

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5
Q

How is access to switch rooms controlled?

A

By locking the rooms at all times and only allowing authorised persons to be issued with the keys

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6
Q

What should you do before proving dead

A

Visual checks of potential indicator

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7
Q

How do you isolate HV and LV supplies?

A

HV - Circuit main earths shall be applied at all points of isolation
LV - points of isolation shall be locked open

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8
Q

What happens to a Permit to Work when the recipient is unavailable?

A

A new PTW shall be issued to the person who is to continue the work. An authorised person shall cancel the original permit and inform the holder of the original PTW that their PTW has been cancelled and that the apparatus is to be considered live

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9
Q

Secure

A

Remove

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10
Q

Apply

A

Remove

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11
Q

Isolate (opposite)

A

Restore

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12
Q

Open

A

Close

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13
Q

Who would normally apply additional earths?

A

The competent person at the point of work

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14
Q

Is it permitted to carry out work on an HV circuit without a CME being applied

A

No

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15
Q

Potential indicator checks

A

Check rating and condition, check operation before and after, ensure approved and used by AP

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16
Q

Smell of rotten eggs in substation ?

A

Report, lock doors, exit area

17
Q

Bus bar are shutters not closed?

A

Lock door, report

18
Q

Vertical isolatable circuit breakers - what are the 3 service positions?

A

Bus bar earth, service, circuit earth

19
Q

Why do we use anti-reflex handles?

A

To stop us from reversing an action quickly

20
Q

Name 3 things a protection system does

A

Detect a fault at the lowest possible current
MINIMISE - disconnect the faulty plant in the shortest possible time
DISCRIMINATION - disconnect only the affected equipment to leave as much healthy equipment in service

21
Q

What is fault energy proportional to?

A

I2t

22
Q

What are the 2 main causes of excess current?

A

Short circuit

Overload

23
Q

Where do you find a Buchholz relay

A

Oil filled transformer

24
Q

5 deadly sins?

A 
Proving dead (earthing)
Application/security of earths
Identification of equipment
Safety lock procedure
Proving dead at point of work

HV Switching (1 decks)

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