And applicationsevaluate circuit breakers terms purpose

Advanced Diploma of Electrical and
Instrumentation Engineering for Oil and Gas Facilities

CRICOS Provider Number: 03567C | Higher Education Provider Number: 14008 | RTO Provider Number: 51971

and Applications

• Determine effective procedures for the management of protection systems

CRICOS Provider Number: 03567C | Higher Education Provider Number: 14008 | RTO Provider Number: 51971

Safeguard the entire system to maintain continuity of supply: Avoid •
failures, disconnect faulty parts.

• Ensure quality of supply: Interruptions, voltage disturbances.

2. Limits faults from turning into failures.

3. Isolates faulty components from the rest of the network.

• Avoiding the undesirable effects of abnormal electrical system behaviour by appropriate action.

What is protected?

CRICOS Provider Number: 03567C | Higher Education Provider Number: 14008 | RTO Provider Number: 51971

3. Stability: To leave all healthy circuits intact to ensure continuity or supply.

Speed: To operate speedily when it is called upon to do so, thereby 4.

Emphasis on speed for the following reasons:

• To keep voltage depressions as short as possible in the interests of plant

stability.

• The touch voltage (in the protective earthing)

• The time of protection operation

(usually neutral of a 3 phase system) to earth directly or thro’ an

impedance.

Calculate the neutral earthing resistance required for a 3 phase 11000 V system for limiting the earth fault current to 300A?

The main tasks of instrument transformers are:
• To transform currents or voltages from a usually high value to a value appropriate for relays and instruments (1 or 5 Amps).

• To insulate the relays, metering and instruments from the primary high voltage system.

The basic transformer principle converts the voltage on primary to an

• Connected in series to carry the full rated / short circuit current of the

circuit under measurement.

CRICOS Provider Number: 03567C | Higher Education Provider Number: 14008 | RTO Provider Number: 51971

impedance which will improve the regulation / accuracy.

CRICOS Provider Number: 03567C | Higher Education Provider Number: 14008 | RTO Provider Number: 51971

CRICOS Provider Number: 03567C | Higher Education Provider Number: 14008 | RTO Provider Number: 51971