System Protection
What two methods are used to accomplish Coordination?
This device is used to "bypass" a customer STA when performing work at that station
Feed-through bushing
All ACB breakers used in distribution are within this type of switchgear
Metal-clad
What DOP governs Authorizations
DOP 1501
What are the duties of a DSO
Ensure the system is operating safely and efficiently while maintaining public trust in SDG&E's products and services
List the 4 interrupting/insulating mediums used by SDG&E
Air, Oil, Vacuum, Gas
T or F: An SR can be in both Switch Mode and HLT at the same time
T. However, IR's can not be in more than one mode.
How is a bank voltage regulator isolated?
Set regulator to Neutral, open the bypass disconnect
What is the definition of a HOLD?
Formal statement from SDGE/GCC&EDO assuring that the state of a named device will not change until the HOLD Authorization is released.
A numerical circuit identifier of "686" is for what kind of circuit?
69 kV Transmission Tie Line
Where are CT's normally installed within electrical components
CT's are placed on line and load-side bushings
This relay prevents inadvertent paralleling with customer generators
High Voltage Line Monitor/ Sync-check
What is the normally preferred source for the relay potential selector switch? Why?
High side PT. Used in the under frequency protection scheme which is primarily for Transmission system protection.
What is the definition of a Hot Line Order
Grants permission to perform work on or near energized conductors with an assurance that the conductors will not be re-energized by DCC in the event of protective relay action on the circuit.
What does FLISR Stand for?
Fault Location Isolation, and Service Restoration
This protective scheme counts the number of "spikes" above the SGF setpoint within a given period of time in order to operate
DCD (Downed Conductor Detection)
PMU Stands for what? What is another name for this device?
Phase Measurement Unit/ Syncrophaser
What is the most common method of bank oil preservation used at SDG&E?
Nitrogen Cap/Seal
What statement ALWAYS follows a HOLD authorization
"You have an OK to test de-energized, apply and remove grounds per the job's grounding plan"
LR is the abbreviation for this substation.. in what district?
Lamar, Eastern
What are the 5 goals of system protection?
1. Speed
2. Selectivity
3. Simplicity
4. Sensitivity
5. Security
What does "XLPECN-PEJ" mean in regards to a conductor
UG cable: Cross-Linked PolyEthylene, Concentric Neutral- PolyEthylene Jacket
What is the ANSII regulated normal household voltage range?
116-124 volts
What are 3 exceptions to the requirements of a HOLD?
-When isolating a capacitor station to do safely work elsewhere on a circuit.
-Isolating a single UG station for work at that station
-Isolating and bypassing regulators for parallel
Frequency of a waveform is measured in ____ Per second
Cycles (One complete positive and negative sequence together)