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What is the PSSP?
- Power System Safety Protection (PSSP)
- System Operating Order 1T-12.
What is the PSSP?
consistent application of safety protection on BC Hydro’s transmission and distribution power system.
The constraints applied to the power system to provide worker protection from power system hazards during prescribed work.
What does SPR stand for?
Safety Practice Regulations
What does WPP stand for?
Worker Protection Practices
Used in generating stations.
What is the relationship between the PSSP and the SPR?
SPR is a book of rules and instructions for work being done on the power system. PSSP is the SOO which defines how the SPR are applied throughout the power system.
What are the duties of the PIC?
- Ensure that the status of the power system or assigned part of the power system is accurately represented on a mimic display.
- Direct the field staff in performing switching on level I to IV equipment to isolate or restore the power system or part of it.
- Maintain a log of switching details, safety protection guarantees and operational events
- Confirm the holder of any safety protection guarantees, and confirm the accountability for safety, at any site created for work on the power system
- Authorize the commencement of any work on the power system or assigned part of it.
Who is responsible for procedures at
the work site?
the holder of the SPG
What must happen after a SPG is in effect
- The equipment to be worked on must be tested to verify isolation before grounding and blocking begins
- After testing to verify isolation, the person responsible for the crew (normally SPG holder) must verify that required grounding and blocking devices are in place before work begins
With respect to Power System Definition, equipment included on BC Hydro’s power system as it relates to PSSP will be defined where?
Equipment included on BC Hydro's power system as it relates to PSSP will be defined by system operating orders, distribution operating orders, station and circuit one-line diagrams.
How does each major equipment on the power system need to be identified?
By a unique number or alpha-numeric designation affixed to the equipment.
This identification is required to ensure that the equipment is accurately described in communications and documentation.
Why are system locks applied to devices?
System locks are applied as necessary to provide safety protections. They are also applied for normal operation to reduce exposure to unauthorized access.
What is meant by Central Control?
It is to establish uniform control throughout the power system.
What is a PSSP mimic display?
The PSSP mimic display will be a symbolic representation of the power system, used to indicate the operating positions of equipment and of field tagging.
What is the definition of Operating Authority?
Operating Authority is defined as the right to control an assigned portion of the power system to establish the conditions required for and to issue Safety Protection Guarantees, Live Line Permits and Assurance of No Reclose Permits.
Explain the responsibilities of both the PIC and the worker regarding Isolation for Safety Protection.
- responsible and accountable for determining the isolation required and sequence of switching, locking and tagging necessary to isolate major equipment.
- Worker receiving a safety protection guarantee
- Responsible to check isolation using a combination of field checks and reference to operating diagrams and drawings.
- Testing will be required to ensure the equipment is de-energized before grounding and blocking.
What are Distribution Operating Diagrams? What kinds of prints do they typically contain?
Family of drawings and schematic diagrams that represent the distribution system.
Circuit Location Diagrams, Primary Maps, Distribution Operating Diagrams or other similar names.
They must be clearly stamped with the words MIMIC DISPLAY if they are used by the PIC to form part of a mimic display.
Fully explain the 5 Levels of equipment differentiating Level 1-IV equipment from Level V equipment?
- Level I-IV
- All power system equipment which is either shown or listed on station operating one line diagrams and transmission equipment which is under the direct operating responsibility of a central control facility.
- Self Protection may not be taken on level I-IV equipment.
High Voltage Distribution equipment including all field reclosers where looped or multiple feeds exist and where customers have customer in-feeds.
- Level V
- May be isolated using Self Protection
Stations: any power system equipment not shown or listed on the station operating one line diagram
Distribution: Power system distribution equipment of any voltage outside stations, where looped or multiple feeds do not exist.
What is the Official Log?
The log used by the PIC to record system operation, Safety Protection Guarantees, Live Line Permits and Assurance of No Reclose Permits that are issued on the portion of the power system for which the PIC has operating authority. The PIC must sign the official log.
What are Operating One-Line Diagrams?
The electrical schematic diagrams that represent all station Level I through Level IV high voltage equipment.
What is a Plant Alteration?
A document that indicates changes required to a distribution system.
Can the PIC use a level V device as an isolation point?
The PIC may use any Level V device as an isolation point as long as it can be uniquely described.
What are the rules for equipment designation?
Each substation and control centre must be assigned a unique abbreviation consisting of three letters or two letters and a number.
All level I through IV equipment in substations must have a unique alpha-numeric designation
All high voltage circuits must have unique alpha-numeric designations.
All overhead level IV Distribution switches, cutouts and fused disconnects identified on Safety Protection Guarantees must be assigned a unique number or alpha-numeric designation.
What is a system lock?
A high quality security lock with replaceable cores keyed for one or more master keys.
Any device with a locking facility already in place must be locked with a system lock when that device is used to establish PSSP.
Operating Responsibility is documented in which SOO?
A PSSP mimic display may consist of a combination of what?
A PSSP mimic display may consist of a combination of dynamic or static display boards, electronic displays (with a paper copy for backup), operating one line diagrams, or Distribution operating diagrams.
With regards to switching, when is the mimic
The mimic display is tagged after the switching is completed and before the SPG is issued. Tagging is part of the switching process not the SPG process.
What are the requirements for multiple SPGs with common isolation points?
Each guarantee will have its own set of tags on the mimic display.
- A (3) must follow the alpha numeric designation of three individual single phase components on the mimic display as one device.
- The PSSP will be tagged with only one tag. Each motor device must be tagged in the field.
Switching orders and safety protection guarantee forms must indicate (3) after.
What does the designation “(3)” mean when indicated next to a device on a One-line diagram? What does this mean with respect to hanging tags in the field?
The designation (3) indicates three individual single phase components when only one is shown. In the field, each device must be tagged.
Three individual motor operators. Must tag all three in field.
If not tag on handle (gang-operated) or B-phase (manually operated).
Can Operating One-line Diagrams be used as Mimic Displays? What is the procedure for doing this?
- Operating one line diagrams will be marked up to show the tagging of isolating devices not show on the mimic display. Isolation points will be enclosed by a color coded line drawn on the diagram. A dated notation reference to the SPG will identify the isolation zone.
- Red color coding for Clearance tagging and blue for Test and Work permits.
- De-tagging is done by stroking out dated notations.
- Operating one line diagrams that form part of the PIC’s mimic display will be clearly stamped with the words “MIMIC DISPLAY”.
When are Distribution Operating Diagrams used as Mimic Displays?
Distribution Operating Diagrams will be used to tag Distribution devices not shown on a Distribution mimic display. Clearly stamped “MIMIC DISPLAY”
What is a Combination Display? What are the rules around taggingof Combination Displays?
A combination display is a mimic display consisting of a combination of displays and the isolation points for a Safety Protection Guarantee (SPG) are represented on more than one display. A caution tag marked “PSSP” with a note referencing one display to another must be attached to each display.
What Level of equipment is shown on PSSP Mimic Displays (not including Distribution Operating Diagrams used as Mimic Displays)?
The mimic display must include all portions of distribution circuits where high voltage loops or multiple feeds exist ( level IV).
The role of PIC can only be assigned to workers who have beenauthorized to what Category?
- Category 6.
- Safety Protection Guarantees, Live Line Permits, Guarantees of No Reclose and Assurance of No Reclose Permits can be issued only by the PIC responsible for that area.
Where are boundaries between Transmission and Distribution Operating Authority areas described?
Boundaries between Transmission and Distribution Operating Authority areas will be defined in system operating orders.
On an Operating One-line diagram, what is drawn to identify an Operating Authority boundary?
A dotted line.
What is a Transfer of Operating Authority?
A transfer of Operating Authority is used by two PICs to move the operating boundary such that the required lines or electrical and mechanical devices are all within one area of control following the transfer.
What is a Guarantee of No Reclose?
A Guarantee of No Reclose (GNR) must be obtained before issuing a Live Line Permit or Assurance of No Reclose Permit that depends on no reclosing under a neighboring area of control.
The GNR information must be logged in both areas of control and must be tagged on the mmic display in the issuing area of control.
What is a Guarantee of Isolation?
A Guarantee of Isolation is used by a local PIC to establish an isolation point in a neighboring area of control. Must be obtained before issuing a Safety Protection Guarantee.
The mimic display must be tagged in issuing area of control.
What is Customer Isolation?
Customer Isolation is provided for a customer that requires isolation from the power system. BC Hydro will apply GOI (Guarantee of Isolation). Customer isolation can apply to level 5 equipment.
Who is the Person in Charge?
The one person with operating authority and operating responsibility for a portion of the electrical system.
What are the responsibilities of the PIC?
- -direct the operation and tagging of level I to IV devices.
- -direct the isolation of any necessary level V devices. (ie those level V devices on SPGs)
- -issue all Clearances, Test and Work Permits, Guarantees of Isolation, Guarantees of no Reclose, Live Line Permits, and Assurance of No Reclose Permits.
- -Maintain the official log.
- -Keep a record of all Safety Protection Guarantees, Guarantees of Isolation, Guarantees of No Reclose, Live Line Permits, and Assurance of No Reclose Permits issued.
- - Hold a file of all cancelled permits.-Maintain the mimic displays that represent conditions on the part of the power system that the PIC has authority over.
Following the receipt of a SPG, a worker will
- Confirm the isolation
- after receiving the SPG, but before going to work on the isolated equipment, the SPG holder will ensure that appropriate testing is performed to confirm de-energized conditions immediately prior to applying grounds.
The worker may take Self Protection on any additional level V equipment.
Before the SPG is returned and prior to the removal of working grounds, the Self Protection that was applied must be removed and the auxiliary devices returned to their normal in-service positions provided no other SPG tags are in place.
Can a worker apply Self Protection tags on Level V equipment inside a SPG zone of isolation?
Yes, if the worker is authorized to category 5.
What is Self Protection?
Self Protection is a Safety Protection Guarantee that category 5 or 6 workers can take on equipment or conductors for which a Clearance or Test and Work Permit is not required.
Level V isolating devices in stations may have multiple Self Protection in effect at any one time.
What must be done before issuing a ANRP or LLP?
automatic reclosing will be blocked on a distribution line section which can be re-energized by automatic reclosing devices located upstream in the line or at the substation
What is a Switching Order Form?
A switching order form must be used by the PIC when a switching sequence consists of three or more steps. Each substation must have a switching order book.
What is a tailboard and when must one be held?
Discussion about the scope of the work and hazards associated with it.
Held before and after work and whenever the scope of the work changes.
Fully explain the Switching Order Procedure?
- - PIC specifies switching assignment and identifies the operations and sequence of operations.
- - PIC confirms the person that is to do the switching is authorized.
- - The authorized person that will perform the switching assignment will review the switching order carefully.
- - The authorized person verifies the location and operation of the correct equipment by checking the designations on the switching order and on the equipment.
- - Mimic display is updated by the PIC when the switching order is completed.
- - Enters station identification, switching order number, purpose of the switching order, date and time of issue and completion of switching order.
What must be done if an unsupported field tag is discovered?
If an unsupported field tag is discovered, it will be referred to the PIC and then by the PIC to the PIC’s manager. After a thorough investigation, it will be determined whether or not the field tag can be removed. A written record of the incident will be forwarded to the Chair of the PSSP review committee.
Explain the Repeat Back Procedure.
A worker receiving verbal instructions must repeat them back to the issuer word for word and shall receive acknowledgement.
What two components does PSSP training consist of? Explain fully the Modules of training for the System Component. What is Local Component?
PSSP training consists of a System Component and a Local Component.
System Component training modules are:
1A: information to customers under 60 kV with no customer in-feeds who use the Customer Isolation Tag procedures.
1B:information to customers 60 kV and above, and to customers under 60 kV with customer in-feeds who require information about the PSSP isolation procedures.
2:Authorization limited to access the system.
3: authorization required to work on a power system that does not require a Safety Protection Guarantee except a Protection Extension.
4: Authorization limited to receiving an Assurance of No Reclose Permit for tree trimming work.
5: Authorization limited to switching level I-V equipment, receiving Safety Protection Guarantees, Live Line Permits, and authorized to isolate level V equipment to take Self Protection.
Authorization to Category 5 provides a worker with “standing” operating authority for level V equipment.
6:Authorization to receive operating authority, to preform PIC duties, and to issue Safety Protection Guarantees, Live Line Permits and Assurance of No Reclose Permits
Local Component training contains the appropriate safety and operating procedures for a specific function of the power system.
How often are employees and contractors to be re-certified?
Every 2 years
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