1. What makes substation work?
What is in a substation?
What makes substation work?

2. Parts of a substation 1. Primary power lines 2. Ground wire
3. Overhead lines
4. Transformer for measurement of electric voltage
5. Disconnect switch
6. Circuit breaker
7. Current transformer
8. Lightning arrester
9. Main transformer
10. Control building
11. Security fence
12. Secondary power lines

3. Ground Wire
What do you think a “ground wire” does?
Ground wires prevent user contact with dangerous voltage if electrical insulation fails.

4. Transformers
What do you think Transformers do?
Transformers can be used to vary the relative voltage of circuits or isolate them, or both.

5. Transformers Transformer for measurement of electric voltage
Current transformer
Main transformer

6. Disconnect Switch What do you think a disconnect switch does?
In electrical engineering, a disconnector, disconnect switch or is used to ensure that an electrical circuit is completely de-energised.

7. Circuit Breaker What do you think a circuit breaker does?
A circuit breaker is a manually or automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit.

8. Lightning Arrester What do you think a lightning arrester does?
A lightning arrester is a device used on electrical power systems and telecommunications systems to protect the insulation and conductors of the system from the damaging effects of lightning. The typical lightning arrester has a high-voltage terminal and a ground terminal. When a lightning surge (or switching surge, which is very similar) travels along the power line to the arrester, the current from the surge is diverted through the arrestor, in most cases to earth.

9. Secondary Power Lines What do you think secondary power lines do?
Secondary power lines carry electricity from the transmission system and delivers it to consumers.

10. Can you list the parts of a substation and say what they do?