KOPs
Transformer Protecton
Other
Basic Power System
NMI Questions
100
___ _______ loads are connected at: 1. Gerdau Ameristeel Whitby - connected to 230kV circuits H24C and H26C; 2. ASW Steel - connected to Allanburg TS via 115kV circuit D3A; 3. Ivaco - connected to 230kV circuit D5A or B5D.
Arc Furnace
100
For a standard Hydro-One 230kV to 44kV transformation the secondary voltage lags the primary by _____ degrees
0 Degrees
100
The Breaker and half bus configuration is not often used in Hydro-One. True/False?
False-The breaker and half bus configuration is one of the most common switchyard arrangements used in Hydro One.
100
Who is the largest producer of power in Ontario?
OPG
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 NMI 1004
200
They are to be notified for any of the following Allanburg configurations (planned or forced): • Removing circuit D3A /D3A disconnected from Allanburg TS OR • Both Allanburg 115kV busses split (D1D2 and H1H2 breakers open) OR • Any autotransformer and any other 115kV circuit out of service
Special Studies group
200
For a standard Hydro-One 115kV to 28kV transformation the secondary voltage lags the primary by _____ degrees.
What is 30 degrees
200
The ________ is an instrument field device used to accurately measure power system telemetry.
Transducer
200
Hydro One is the Crown Corporation that transmits the power to meet the needs of_____% of the population of Ontario. a) 50% b) 60% c) 90 % d) 80%
90%
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
Sewage is dumped into the Hamilton Bay after this period following Gage M13 trip.
What is 30 minutes? US Steel has an internal load transfer that may restore power to the Pollution Control Plant.
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
Which is the least expensive Switchyard Bus Configuration?
Single or Radial Fed
300
The 10% of customers not served by Hydro One are concentrated in which two areas?
Niagara and Sault Saint Marie
300
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.
400
Hanmer Autos are unloaded from the 500 kV side and taken off potential via the 230kV oil circuit breakers and are energized from the 230 kV and loaded via the 500 kV breakers.
What switching sequence minimizes the chance for breaker re-ignition while switching Hanmer Autos with in service tertiary reactors?
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 an advantage to using AC over DC?
Large electrical generators happen to generate AC naturally, so conversion to DC would involve an extra step. Transformers must have alternating current to operate, and we will see that the power distribution grid depends on transformers. It is easy to convert AC to DC but expensive to convert DC to AC, so if you were going to pick one or the other AC would be the better choice.
400
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.
500
Scheme to prevent backfeeding conditions which would cause excessive voltage decline issues at the tapped DESNs off B15C and B16C
Why does the non-standard 230kV circuit (B15C and B16C) LEO exist?
500
The Brown Boveri type D2 transformer differential relay is a: a) constant slope differential relay b) variable slope differential relay c) fixed slope differential relay
Variable slope differential relay.
500
2. When is a Frame Leakage protection re-verification performed? a) After making wiring changes to the protection scheme. b) Six months after the installation of a new Frame Leakage protection. c) At maintenance intervals determined by Hydro One Networks and the schedulers. d) All of the above.
At maintenance intervals determined by Hydro One Networks and the schedulers.
500
Large scale blackouts occured in what 4 years?
1965, 1977, 1998 and 2003.
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
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