Power system design part 2 Flashcards
Have you used a Computer software used in Power analysis? Is so, what program was used?
No, but one is IPSA, Interactive Power System Analysis
What do we mean with load flow analysis
Initial before any analysis – which identifies capability, voltage, power flow, load angles.
What do we mean with fault analysis?
Whether your system will be able to withstand faults when occurs in 1, 3 seconds.
What do we mean with harmonic analysis?
How clear is your sine wave (8%) max total harmonic disturbance allowed.
What could happen to the Power system when starting large motors?
Voltage drop due to high starting current.
Which basic document is used when starting/setting up a Power System Analysis?
Load Schedule.
When would you require to do a (new) Power System Analysis?
Addition of a major load
How would you organise or set up a Power System Analysis?
Flow chart required, data from vendor, impedance, transient, sub transient and synchronous impedance.
What are important Electrical System Parameters?
Frequency, voltage, Power, Power Factor, governor, AVR
How do protections grade? Where do we start?
- Protection systems shall be selective and the settings shall be co-ordinated so that back-up protection is provided to initiate fault clearance in the event of protective system and/or switching device failure.
- In zones, From source
What is the importance of minimum and maximum short circuit levels in relation to protection studies?
- Is it enough to operate your protection system.
- Should not be achieved to trip before that.
What type of protection would you use on a delta/star transformer connected as a unit transformer for a generator?
- Differential.
- Vector difference to be compensated.
- Stability through fault current should not operate.
What is the relation between Power System Analysis and protection Co-ordination?
Power system analysis will provide fault level, stability and data for protection co-ordination.
How can you as Electrical Engineer influence the design?
Specs are followed and integrity is not compromised.
