Show:
Process
Protections
Circuits
Air Blast Breakers
General
100
What NOD Dept do you contacting for Power System Issues?
OE - OATS
100
Evidence of an open circuit fault could be?
1. Customer complaints of low or abnormal voltage. 2. Feeder ammeters on NMS indicate abnormally unbalanced phase currents. 3. Abnormally unbalanced voltages at distribution, municipal or customer-owned stations.
100
Once the continuous rating of a circuit has been breached what must a Controller do?
Run to a 120/15/5 minute amp rating depending on the loading, at the end of the time period respect the Continuous Rating. If load cannot be transferred it may be necessary to shed load to respect the Continuous rating.
100
What is the correct response for breaker insulating air high pressure?
Pending dispatch
100
What is the protocol if a SF6 Gas Density alarm received and low SF6 tank temperature alarm are sustained?
The equipment shall promptly be removed from service
200
What NOD Dept do you contacting for Changes to Instructions/CRIS?
OE Instructions/CRIS
200
Operating Networks may also implement voltage reduction (3% or 5%) locally when required for its own demand control reasons (i.e. equipment limitations). What is the protocol?
The IESO must be notified promptly, as per the voltage reduction SCO. Customers on the exclusion list are exempted.
200
The ________ is an instrument field device used to accurately measure power system telemetry.
Transducer
200
What does a breaker excessive filling alarm indicate and what is the correct response?
Breaker air pressure has not replenished in allotted time May indicate an air leak or filling circuit trouble or mechanical fill valve trouble. Immediate dispatch Leave in service
200
What is the protocol if you receive an SF6 Gas Density alarm and the apparatus in alarm cannot be readily identified?
Immediate dispatch of Station Maintenance staff to identify the apparatus in alarm
300
What NOD Dept do you contacting for Large Customer Issues?
Customer Operating Support (COS)
300
Restricted Ground Fault Protection for an In-Zone ground source is not required if adequately rated CT’s are available for the ground backup. True/False?
False
300
What is the correct response when a transmission circuit trips when restoring after a planned or unplanned outage?
When a transmission circuit is automatically removed from service when energized after a planned or unplanned outage then no further attempts to energize the circuit shall be made until a cause is determined.
300
What is the correct response to a breaker close circuit dc fail alarm?
Loss of DC for close circuit Loss of close circuit and breaker air filling circuit Immediate dispath
300
When in the protection re-verification process is the zone test trip performed? a) At the beginning before relay calibration checks. b) At the end of the protection testing but before load cross readings. c) At the end of protection testing and after load cross readings. d) It doesn’t matter.
At the end of protection testing and after load cross readings.
400
Who is responsible for Customer Service for direct connected load customers off NOD feeders?
Provincial Lines Zone Superintendent
400
Transformer Master Ground Protection supervises the following LV Bus ground Relays and Lv Feeder Ground Relays. True/False?
True
400
How many Current Transformers are there in a typical Frame Leakage protection scheme?
Two . One for the breaker ground strap and one for the current transformer ground strap.
400
What is the correct response to a breaker low air pressure (reclose block)?
Breaker air pressure is low due to a leak or filling circuit trouble Breaker air pressure has dropped to the point that the reclose circuit is blocked Immediate dispatch
400
What protection elements require zone test tripping? a) H.V. Power Transformers b) High Voltage Buses c) High Voltage Lines d) All of the above
All of the above
500
What department is responsible for Emergency Preparedness at Hydro One?
Business Continuity
500
When a breaker fail occurs and the failed breaker and its associated disconnect switches cannot be opened by control and customer load is off, what must a Controller do prior to reenergization?
On-shift GOM-Tx approval is required. The decision to attempt restoration of one or more of the associated elements without opening the failed breaker disconnects shall be based on ALL of the following criteria. a) No primary protection annunciation related to protections for either the failed breaker or its associated elements are sealed in and b) The breaker disconnects cannot readily be opened and c) Customer load and/or Hydro One Networks Inc (HONI) assets will be adversely affected if one or more of the associated elements remain out to service.
500
What is a Controller Required to do prior to ordering an operation of live-line connectors?
The Controlling Authority shall determine whether: a. the connector (loop) is being removed entirely, or b. the connector is being removed at one end only, and tied back to the conductor, or c. the connector is being removed at one end only, and connected to ground (ie. to the structure)
500
What is the correct response to a breaker low air pressure (close block) alarm?
Breaker air pressure is low due to a leak or filling circuit trouble Breaker air pressure has dropped to the point that the close circuit is blocked Immediate dispatch
500
Name two stations that are washed in the fall just prior to the contamination monitoring season.
Beach TS Birmingham TS Gage TS Kenilworth TS Preston TS Manby TS 115kV East Strachan TS Gerrard TS