high voltage survival

7/30/2019 High Voltage Survival

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HIGH VOLTAGE S URVIVALMODULE 1

HIGH VOLTAGE AWAR ENE S S



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Responsibilities

The person ultimately responsible for your safety is YOU!

The company is responsible to protect its employees to the

best of its abilities by providing protective equipment, training

and procedures.




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Definitions

Why should you be scared of high-voltage and what does it

do to you!

Definition of High Voltage

Line voltage in excess of 1000 volts ac or dc

What is dangerous! What is safe!




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Electric Shock




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Technical Knowledge

If you are going to work on high-voltage systems, what do

you need to know.

• Who should do it and what qualifications do they need.

• What safety equipment do you need.

• What procedures are available.




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Who can work on High-Voltage systems

S omeone with Technical Knowledge

Adequate knowledge of electricity

Adequate understanding of the system to be

worked onAdequate understanding of the hazards and the

precautions.




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S omeone with Experience

Adequate experience of the work to be carried out

Adequate experience of the system to be worked

on.

The ability to recognize hazards and decide

whether it is safe to carry on.





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S omeone who is Competent

Defined as “The ability to repeatedly perform tasks

to a given standard both efficiently and safely.”

The responsibility for deciding whether someone is

competent to carry out work on high voltage power

distribution systems lies with the ROV supervisor.





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Safe Systems at Work

1. S afety R ules are set by the company and must be followed. If anissue arises with the rules, bring it up with your supervisor or at the

next safety meeting.

2. For any High-Voltage work, another person must be present. AND

they must know how to switch off power and raise an alarm.

3. A “Permit to Work” system mus t be followed.4. Methods of isolating a system such, “Lock Out Tag Out” must be

used.

5. Barriers and signs must be used to keep non-authorised people

away.

6. R isk Assessments should be performed for each tasks.

7. Alternative energy sources must be identified and neutralized




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Safety

1. Attitudes towards safety.• A safe working environment can only be achieved in a work place with a

positive attitude towards safety by ALL members of team• Poor attitudes towards safety usually come from the belief that

Accidents happen to other people, not me. The main priority is to get the job done.

It’s other peoples responsibility .• Its generally accepted that people who have experienced an accident or

a near miss do change their attitudes towards safety. They are more

willing to share their experiences with others in order that they too

change their attitudes• It is important that inexperienced personnel to s eek as sistance or

instructions from supervisors where questions are raised.




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Safety

1. The S afety Culture• Every group of people develop a ‘culture’ – shared attitudes, belief, etc.

In a company with a good culture, safety is high on everyone's list and

this influences events and decisions made• Key issues that are required to ensure a good health and safety culture

Control

Competence

Co-operation

Communication




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Procedures for working with High Voltage

1. No electrical conductor should be regarded as safe unless it has beenisolated, the isolation being made secure, conductors shown dead, proved

dead by suitable test equipment and where practical, bonded to earth.




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2. Precautions should be taken to ensure that the isolated equipment cannot bere-energized and a sign should be placed on the power control unit.




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3. Voltage indicators should always be tested before and after use.




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4. Barriers preventing access to enclosures containing live conductors shouldalways be locked when not attended by a competent person.




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6. Any switches used for isolation must be locked to prevent movement to the“ON” position.




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7. Adequate quantities of suitable locks, cautionary notices and barriers shouldbe available.




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8. Equipment enclosures frequently contain circuits with more that a singlesupply and these circuits are not always isolated when the main circuit is

disconnected. Alarms, interlocks and lighting circuits, etc should be shrouded to

prevent accidental contact.

9. Removal and retention of fuse links or jumper cables should only be used as

a means of isolation when suitable precautions are taken and arrangements arein place to prevent duplicates from being inserted.




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Preparation for Work


●

A working space should be free and clear of obstructions● Adequate lighting, either fixed or portable, mus t be available.

● E lectrical tools should regularly inspected and certified “Fit for Use” by a

competent person.

● Moisture and Dirt should be kept away from a work-site.

● Before any work commences , conductors need to be tested for any voltage

between the phases and to earth.

● A final inspection of the work-site should be made when the work is complete

for any tools, foreign matter and loose material.

● Fire fighting equipment should be kept handy and available.



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Where is the High Voltage?


Locked against

unauthorised entry.



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Where is the High Voltage?


TMS Instruments

1phase Transformer

TMS HPU 3phase

Transformer



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The Main Source of Concern


High Voltage Trans former Unit

(HVTU)

Input

420 - 480 volts

3Phase

Output

3150 Volts per phase

3Phase!!!



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The Main Source of Concern


ROV Termination

J-Box



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We Can't Forget.


S liprings at the Main

Winch and the TMS



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We Can't Forget.


ANY loose wire from a main umbilical or a flying tether shouldbe treated with suspicion until you have confirmed that there is

no voltage present.

When in doubt, short it out!!!!!



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THE END


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