Transformers Study guides, Class notes & Summaries

APT4801 Assignment 6 2023 (TEST NO 6) 100% TRUSTED workings, explanations and solutions. For assistance call or whatsapp us on +25479 811 9845 . QUESTION 1 [22] Three-zone mho relays are used for transmission line protection of the power system shown in figure 1 The line impedances are Line 1 – 2: j60  Line 2 – 3: j40  Line 2 – 4: j70  The rated voltage for the HV buses is 400 kV. The CT and VT ratios at B12 are 2 000/1 and 3 600/1, respectively. Figure 1 power netwo...

Heat and ____________ are the main problem areas in transformers. Dirt Transformer gauges indicate the correct oil level at a temperature of 25 Degrees Celsius You should periodically test the air above the liquid in a transformer for TCG, which stands for transformer Combustible Gas Inductance is represented in equations by the letter L XL = 2πfL is the equation for the ____________ reactance of a coil. Inductive Four inductors with values of 25 h, 5 h, ...

When using a dynamic schedule and the energy profile in an hour is >250 MW and the actual hourly integration deviates from the hourly energy profile by ____ the tag must be modified. A. 100 MW B. 10% C. 50 MW D. 25% B. 10% Dry steam plants, flash steam plants, and binary cycle power plants are the three main types of what kind of generating plant? A. Nuclear generators B. Combustion turbine generators C. Geothermal generators D. Hydroelectric generators C. Geothermal generators...

What does PLFA stand for? - Answer- Power Limited Fire Alarm What does NPLFA stand for? - Answer- Non Power Limited Fire Alarm What material must NPLFA circuit conductors be made from - Answer- Only solid or stranded copper is permitted What is a single station detector? - Answer- Battery powered smoke detectors that do not communicate off premises. What is a multiple station detector? - Answer- Mains powered smoke detectors with battery backup that are linked together, so that if on...

NERC Transmission Practice Test, Exam Q&As, A+ Guide-Station #1 is at 539KV and station #2 is at 534 KV. Which direction will the MVAR typically flow? A. From station #1 to station #2 B. From station #2 to station #1 C. Downhill based on power angle D. Uphill based on power angle - A. From station #1 to station #2 Each transmission operator shall arrange for supply of _____ resources within its boundaries to protect the voltage levels under contingency conditions A. Transmission B. Gene...

LML4806 PORTFOLIO MEMO - MAY/JUNE 2023 - SEMESTER 1 - UNISA (DETAILED MEMO - DISTINCTION GUARANTEED!) QUESTION 1 1.1 The Memorandum of Incorporation of Generators Unlimited (Pty) Ltd provides that only the board of directors, or any director authorised by the board, has the power to conclude contracts on behalf of the company. It also states that any transaction that exceeds R10 million must first be authorised by the company’s shareholders at a general meeting by way of an ordinary reso...

What is the hold time for soil and preserved GW GRO samples? - Answer- 14 days Is an ICC certification needed to install an AST? - Answer- No Flammability limits of gasoline - Answer- 1.4 to 7.6% How many days do you have from a tank closure to report/provide the UST checklist to ECY? - Answer- 30 days MTCA Method A lead CUL, soil - Answer- 250 mg/kg MTCA Method A lead CUL, GW - Answer- 15 ug/L Is the vadose zone saturated or unsaturated? - Answer- Unsaturated List in order ...

What is the first thing a tech should do when arriving at a no combustion call? - Answer- Ask how many times the customer reset the unit. What is the best long term solution for preventing a clogged nozzle? - Answer- -Remove any underground storage tanks. -Install a quality oil filter. -Cut the suction line 10" above the tank outlet to prevent sludge. Hot water and steam valves are interchangeable. - Answer- False When in the presence of a flame, a cad cell normally reads.. - Answe...

Power-factor or dissipation-factor tip-up tests on large dry-type transformers that exceed ______ percent should be investigated 1 A switch or circuit breaker enclosure may be used as a raceway if the conductor fill does not exceed % 40 The Ferranti effect is experienced on a long overhead transmission line when it is Lightly loaded In fiber optic cables, a 50% reduction in signal strength is a loss of dBm 3 Non time delay fuses for the protection of wound rotors ...

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