INVESTIGATE the CT ratio and spill current setting of differential protection of transformer for the power network. Assume 1A for CT secondary current. Given the transformer output 11 MVA and transformer voltage of 36/16 kV with A-Y connection.

INVESTIGATE the CT ratio and spill current setting of differential protection of transformer for the power network. Assume 1A for CT secondary current. Given the transformer output 11 MVA and transformer voltage of 36/16 kV with A-Y connection.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter14: Power Distribution

Section: Chapter Questions

Problem 14.10P

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Concept explainers

Distribution System

The final stage in the delivery of the electric power is the electric power distribution system. From the transmission system to the individual customers it carries electricity. The distribution system is connected with the transmission system and is used to lower the voltage of the transmission to medium voltage in the range of 2 kV to 35 kV with the help of transformers. This medium voltage to the distribution transformers located near the customer's premises is carried by the primary distribution system lines. These distribution transformers in turn lower the voltage to utilization voltage used in lightings, household appliances, industrial equipments etc. Through secondary distribution lines often several customers are supplied from one transformer. It is through service drops, the commercial and residential customers are connected to the secondary distribution system lines. Customers who demand a larger amount of power can be connected directly to the primary distribution system level or the sub-transmission level.

Question

INVESTIGATE the CT ratio and spill current setting of differential protection of transformer
for the power network. Assume 1A for CT secondary current. Given the transformer output
11 MVA and transformer voltage of 36/16 kV with A-Y connection.
Delta
Connected
Star
Connected
CTs
Delta Side
Star Side
CTs
tuu
tuw
Restraining
Coil
Operating
Coil
Figure 4b: Configuration of differential protection on transformer

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