SDOP
Define EWP.
Permission to work on or in close proximity to energized lines or equipment above 600 V, for which the source of supply could automatically re-energize the lines and equipment are disabled.
Automated Roster Call Out System
What is required in a switching order?
Purpose of switching
Date
Name of person issuing switching
Name of person executing switching
Start time (no completion time)
Numbered steps
Name considerations for switching.
Voltage Regulations
Schemes
Wire size
Function switches
Key/Cent customers affected
Load
What is LTD?
Location - Term - Destination
Name conditions that limit you from issuing an EWP.
Ground protection disabled
Reclosing disabled
Trip coil monitor alarm
Battery alarm
Relay diagnostic alarm
Low SF6 alarm
Bad weather
Scheduled switching for that breaker/device
When would you need to ARCOS a crew?
When 3 or more crew members are needed.
At night when staffing is low
When there is an injury/emergency
During storms/major damage
What is the purpose of a distribution station breaker?
Designed to break load and protect transmission lines from fault
Cannot get clearance on breaker by itself, no visible air gaps
Designed to open/close under normal and abnormal conditions
Designed to carry normal load without overheating
Designed to open quickly for faulted circuits without damaging itself or other equipment
What considerations would you take when operating a solid blade switch?
Disable reclosing on most upstream device looking in normal direction
Consideration disable ground protection if load will trip ground
What is the leap frog method for isolating an UG fault?
Red go ahead, black go back
Open/tag as you go
Define a clearance.
Permission to work on a line section, bus or apparatus that is disconnected from all sources of electrical energy by having disconnect switches or other appropriate visible air gaps open, made inoperable where possible and properly tagged.
Who would you contact before ARCOSing a crew?
Supervisor on call (SOC) or first responder on call for outside regions
Name the different types of differential scheme and how you identify the zone of protection.
Bus/Bank Differential
High side is AIM switch but no Low-Side bank breaker
Bank differential that looks all the way out to end of distribution lines
Zone of protection overlaps with PCB Breaker overcurrent protection
Bank and Bus Differential
Differential scheme has both AIM switch on high-side and Low-Side bank breaker
Both have CT's that overlap each other
Bus Differential
High-side fuse and Low-side bank breaker
Low-side bank breaker has CT's for differential scheme
Overlaps with CT's on feeder breakers
No high-side differential
Why would you want to make double loops in OH switching?
When dealing with 1/0 wire that would otherwise burn up if we tied circuits through it.
What is the most common type of wire used for UG?
1/0 AXNJ
If a voltage regulator is on lower 10, does it have more or less carrying capacity?
Less--as a voltage regulator moves further from neutral, it has less carrying capacity.
What is the J/A rule?
Journeyman/Apprentice Rule
Requires that each apprentice have a journeyman riding with them. Only the SOC can uncheck this box
What steps would to take to bypass a breaker with a direct bypass and regulators?
Disable reclosing
Place regs to MNO
Disable ground
Close bypass
Open 3 switch
Tag 3 switch
Open breaker
Open 1 switch
Tag 1 switch
When tying two circuits with different substations and both feeders have LTCs, what do you need to consider in regards to regulation?
Place one LTC to manual, usually the larger of the two so you have control over the larger piece of equipment.
If you are switching through an auto cubicle, what switching steps should you take?
Place cubicle to MANUAL
If used for clearance, put to local
Open
Lock open
Tag
Can you have two or more crews on a clearance at one time? Why?
Yes--they are hold multiple clearances within the same parameters but each crew needs their own set of grounds for their individual work locations.
What information is needed for an ARCOS call out?
TCMS reference number
Address of work location
Description of work being performed/trouble
# of crew members needed
What steps would you take to transfer load from one breaker to another with same bank/same bus and both feeders have regulators?
Disable R on both feeders
Place both sets of regs to MNO
Disable G on feeder being taken out
Close 1 transfer switch to test best
Disable G on feeder that will carry load
Close other transfer switch to tie
Open 3 switch
Tag 3 switch
Open breaker
Open 1 switch
Tag 1 switch
Put good breaker back in service (G, ON/AUTO, R)
SC on breaker being taken out
If you have a breaker lockout, what do you do?
Check SCADA breaker for targets/fault data/alarms
Review TCMS calls to find details for outage
Send out lockout page
Check schemes to see if they operated/isolated fault
Check SCADA devices to try and isolate fault by remote
When executing emergency UG switching, do you isolate mainline or 1/0 first?
mainline then 1/0