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Define Isolated
All sources of hazardous infeed have been disconnected by a opening a switch or making a bus or line cut and securing with a tag and lock
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Who is the Person In Charge? Define this term.
The one person with operating authority and operating responsibility for an assigned portion of the power system.
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Why is it important to create an equipotential zone?
Eliminate step and touch potential in case the conductor/equipment were to accidentally become energized.
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Define Operating Authority
The right to exercise control over an assigned portion of the power system. To establish the conditions for and to issue LLP's, SPG's, and ANRP's.
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Define Operating Responsibility
The right to exercise control over an assigned portion of the power system.
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What are ANRP's?
An assurance from the PIC that the automatic reclose on the circuit has been set to OFF. This ensures that the line will not re-energize if it's tripped from its own protection.
For work near energized conductors. Category 4 tree trimmers.
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What is PSSP?
The constraints applied to the power system to provide worker protection from power system hazards during prescribed work.
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Define Unqualified
Does not meet the requirements for the qualified category.
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Define Qualified - Specially Trained
A non-electrical worker that have passed an approved LOA course
Certified Utility Arborists
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Why apply Worker Protection Grounding/Bonding?
Create an equipotential zone
- Protect against energization by
- Induction
- Lightning
- accidental energization
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What authorization do PSSP category 6 workers have?
PIC duties
To recieve operating authority
issue SPG's, LLP's, and ANRP's.
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What authorization do PSSP Category 5 workers have?
Issue Protection Extensions to Category 3 workers.
Recieve LLP's and SPG's.
Isolate level V equipment and take Self-Protection.
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What authorization do PSSP Category 4 workers have?
Take ANRP's for tree trimming
Certified Utility Arborists.
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What authorization do PSSP Category 3 workers have?
Work on the power system that does not require an SPG except under a Protection Extension.
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What authorization do PSSP Category 2 workers have?
Access the power system.
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How do devices need to be identified?
Unique numeric or alphanumeric identifer
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Who can work in Column 4 LOA?
Unqualified workers and their equipment
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Who can work in Column 3 LOA?
qualified specially trained
Qualified workers with uninsulated equipment
Unqualified workers when continuously supervised by a qualified worker.
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What are the Limits of Approach?
The distances that shall be maintained between workers (including their tools) and exposed energized electrical conductors and equipment by voltage level.
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Who can work in Column 1 LOA?
Absolute limit of approach for qualified workers and their insulated equipment.
More than 2 workers, short duration, with a detailed plan.
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Who can work in Column 2 LOA?
Normal limit for qualified workers and their insulated equipment.
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Define Qualified
Accepted as satisfactory in education and training and in rules and practices.
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Define Guarantee of No Reclose
A stated and duly logged guarantee between PIC's in different operating authorities that a recloser is turned off and will remain off.
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Define Energized
source or potential source of electrical engergy present
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Define Authorized
Having been approved for access or work on the power system.
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Differentiate between level I-IV and level V equipment
level I-IV: more than one source of hazardous infeed and appears on a one-line diagram
level V: one source of hazardous infeed and doesn't appear on a one-line diagram
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With the numbering structure #L-#X, identify the group associated with #,L.
- #
- 1- Policy Orders
- 2- Technical Orders
- 3- Station Orders
- 4- Energy Sources Orders
- 5- Transmission and Distribution Circuit Orders
- 6- Emergency Orders
- 7- Composite Network Orders
- #
- T- Transmission
- D- Distribution
- G- Generation
- J- Joint
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What is a Switching Order? When must a switching order be documented in a switching order form?
An order describing switching steps in proper sequence given by the PIC.
Documented when there is 3 or more switching steps.
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What is a tailboard and when must one be held?
A discussion which covers the scope of the work as well as the hazards.
Must be held before and after work and when the scope of the work changes.
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What is the effect of open circuiting a CT secondary?
Dangerously high voltages accross the CT secondary.
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What is the typical range of secondary output from a PT?
0-120V
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What is the typical range of secondary ouput from a CT?
0-5A
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What are current and potential transformers used for in power systems?
Metering and protection
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What type of drawings can be used for operating (switching, etc) the power system?
- Primary maps
- feeder cable drawings
- UDD's
- DOD's
- operating one-line diagrams
- electronic representation
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What is the SPR's?
The rules that govern work done by and for BC Hydro
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Define GOI
A written and duly logged guarantee between PIC's in different operating authorities that a specific conductor/equipment is isolated and will remain so until the GOI is returned.
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What are the 3 types of SPG's?
- Clearance
- Test and Work
- Self Protection
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Define Safety Protection Guarantee
A stated assurance that a piece of equipment/conductor is isolated and will remain so.
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What is an LLP?
For work on energized conductors by category 5 workers.
An assurance from the PIC that the automatic reclose on the circuit has been set to OFF. This ensures that the line will not re-energize if it's tripped from its own protection.
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