Question

What are the advantages of secondary networks? Name two disadvantages.

Short answer

Answer

Advantages and disadvantages are listed below.

Step-by-step solution

Define secondary network

The underground secondary network is simultaneously supplied by two or more primary feeders through network transformers. In order for a network to function even when two primary feeders are out of service, most networks are made of three or more primary feeders and spare transformer capacity.

Write the advantages of secondary networks

Following are the advantages of secondary networks:

1. Secondary networks maintain a high standard of operating flexibility and service reliability.

2. When the primary supply fails or is shut off, customers are not affected by outages on secondary networks.

3. Because consumers are fed through parallel channels from the secondary mains, failures of secondary cables do not cause customer outages.

4. The secondary network has significant voltage drop and is built to distribute the load among transformers equally. Consequently, they prevent transformer overloading.

Write the dis-advantages of secondary networks

1. It is expensive.

2. It is used in high load areas where revenues justify grid costs.