Question

In addition to the costs of the relays, what other costs should be considered when upgrading relays?

Short answer

The other cost that must be considered while upgrading the relay are described.

Step-by-step solution

Define the numeric relay

The numerical relays are the important protection devices in the power system that are provided with the software based electrical fault detection method. The numerical relay are configure for the different input and the output to detect the fault at various levels which give them the other name of microprocessor relay.

Determine the answer

The relay employed in the modern power system have the circuitry that is advanced and have multiple features for the protection that reduces their cost as compared to the other mechanical and the static relays. The reduction in the cost is because of the falling price of the microprocessor technology as a result of advancement of technology.

There are number of cost reduction that can be obtained while upgrading the relays.

1. The number of relays required along with the up gradation are reduced due to technology advancement
2. As the numeric relay are upgraded the value of the PT and the CT rating needed is also reduced this further reduce the cost.
3. The space required by the panel with the advanced upgraded relay is also reduced.
4. The wiring needed for all the connection is reduced as compared the other relaying techniques.

Therefore, the cost consideration are decribed.