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General 1
General 2
General 3
General 4
General 5
100
What is the correct Controller Response to a Tertiary Overvoltage Alarm?
Treat the alarm as a Transformer Tertiary Ground Alarm and respond as per NMI-0253. For transformers that do not have a switchable shunt reactor connected to the tertiary, a sustained tertiary ground alarm should be investigated during normal working hours. In the meantime, the transformer can remain in service. For transformers with switchable shunt reactors connected to the tertiary, a sustained tertiary ground alarm can indicate a possible reactor fault. Accordingly, the reactor shall be switched out of service as soon as possible.
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
Does breaker frame leakage protection trip the same protection zone as the circuit breaker failutre protection?
Yes
100
IESO is instructed to obtain permission from Hydro One before allowing  autotransformer loading above the calculated continuous rating. What should be considered before granting this permission?
Is  the reason for the request a valid outage, reliability or security concern or is it a market request
100
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.
200
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.
200
What is intolerable voltage?
Voltage levels below 85 percent or above 115 percent of normal, or Voltage levels 85 to 90 percent or 110 to 115 percent of normal after 3 minutes
200
What is the correct response to a Station Building Fire Alarm?
Upon receipt of a Station Building Fire alarm, the Controller shall initiate an Emergent dispatch of Stations personnel. Upon any report of visible flames (fire) or smoke, the Controller shall initiate an Emergent dispatch of the appropriate Fire Department
200
What is the correct response to a station fire detector alarm?
Upon receipt of a Station Fire Detector fail type alarm or HVAC (Heating Venting Air Conditioning) panel fail type alarm, the Controller shall initiate a Pending dispatch of Stations personnel.
200
When should you consider blocking gas trip protection on oil filled equipment?
bleeding gas from the gas relay adding oil to the protected apparatus, lowering oil or taking oil samples using the gas relay drain line Note: *Routine oil samples taken from transformers using sample valves at transformer bases do not require this blocking. work on or adjacent to the protected apparatus or gas relay which could cause vibration For emergency load restoration, gas trip relaying may be blocked provided that the ‘B’ protection and the equipment’s gas accumulation alarms are both functional.
300
What must a Controller do before operating a breaker for a planned outage at Bruce A?
For any planned air blast breaker operations at Bruce A TS, ensure EMD is on site prior to operating the air blast breaker. This includes the execution of scheduled test operation of the breakers, one at a time, during unit outages.
300
What is a "Reliability Directive?"
A communication initiated by a Reliability Coordinator, Transmission Operator or Balancing Authority where action by the recipient is necessary to address an Emergency or Adverse Reliability Impact.
300
What is the purpose of a grounding transformer on a four wire system?
Grounding Transformers provides a means of evenly dividing the unbalanced portion of the load current from a three-phase, four-wire system back into the ungrounded delta supply. A Ground return path provides a protective relay scheme a means of recognizing a flow of current to ground indicating a phase to ground fault or a phase unbalance. A neutral Current Transformer is used to measure this current flow and depending on its magnitude initiate relay protections to clear a fault.
300
What is the purpose of a grounding transformer on a 3 wire system?
A grounding transformer is used on a delta system to provide a path to ground for fault current. Ground current flow is used for relaying to detect ground faults and initiate tripping of effected equipment. In case of a line to ground fault, the grounding transformer allows fault current to flow back to GT Neutral to complete the circuit
300
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)
400
What Controller Response is required when notified that Beck 2 or Saunders are experiencing experiencing intermittent “Negative Sequence” Protection alarms on their respective generating units?
Immediate dispatch for P&C to investiage possible HIROP conditions Memo - 0104
400
What is a master ground relay?
The Grounding Transformers provide neutral current source for the Master ground relay (64M) that is used for supervision of feeder and bus protections to prevent false tripping. False trips can occur when switching on a three-phase balanced system. The resulting current unbalance could cause relays to operate erroneously. To prevent this from occurring, ground current supervision provided by the Master ground relaywould ensure feeder or bus protections only operate when ground fault current is flowing.
400
When is a holdoff required from a Generation Facility?
A Hold-Off is required from any Generation facility which has a dual circuit DESN-style connection equipped with auto-reclosure. For generation facilities connected to a distribution system via a single supply, there is no requirement for a Hold-Off to be established due to the internal design of local protection systems that require healthy voltage and frequency quantities for a pre-determined time period in order to re-connect. For all other Generators there is no requirement to obtain a Hold-Off, provided operation of the facility is controlled by a Connection Agreement.
400
What is the correct response to a Duresca Bus Splice Alarm from Charles TS?
Priority A Low Low Oil Immediate action required by Controller. Bus must be removed from potential Priority B Low Oil Leave in-service. Initiate an immediate dispatch of stations personnel
400
What should done prior to cancelling or extending an outage? (excludes feeders, capacitors, etc)
Discuss with the TX-GOM
500
What should be done when accepting a PC1 for a SG to Pickering A?
If we get a PC1 that indicates isolation from all Hydro One controlled sources and does not specify auxiliaries, we are not to receive it. It is important on our front end that we discuss all voltage levels with Pickering to ensure we provide exactly what is required.
500
What are two possible causes of "Protection in Test Alarms"?
“The Protection In Test input for a protection is activated by the Field by opening an input blocking switch to the relay. If the DC voltage which provides wetting voltage to this input drops below the input threshold for the relay, this could be interpreted by the relay as a Protection In Test condition. The input threshold for a given relay will vary depending on the make/model/order code for the given installation.”
500
What discussion should take place with the Controller and EMD when EMD are testing the gas density monitor on a free standing CT?
Are the trip outputs blocked?
500
What indications could you get of a sustained ferroresonant condition?
a) Unexpected voltage magnitudes on any phase of the isolated circuit b) An audible hum emanating from an otherwise isolated device (i.e. PT or transformer), not unlike that present during normal operation. c) Annunciation, where provided, of the condition. d) The station service will continually and automatically transfer from one source to another
500
What information should a Controller ask and log when a piece of equipment is being returned to service after a automatic or forced outage?
What was repaired or replaced.