• In order to protect a power transformer with 10/0.4 kV voltage, there is an overcurrent relay on the secondary side of the current transformers with the appropriate ratio in each phase on the 10 kV side. In addition, there are three undervoltage relays connected between phases A, B and C and ground on the secondary side of star connected voltage transformers connected to the 10 kV busbar via a fused disconnector to provide undervoltage protection. Each protection relay has one trip contact to control the breaker. Apart from this, 2 N.A. to be used in the control and signal circuits of each protection relay when necessary. and 2 N.K. has contacts. In line with the information given, •Draw the three-phase diagram of the plant. • Draw a circuit breaker control circuit where the protection relay(s) will control the breaker opening coil and open the breaker when a malfunction occurs in the working areas of at least one of the 6 protection relays in the facility, which is directly controlled to the breaker opening coil. •Add a signal lamp circuit to the control circuit, which turns on when at least one of the 6 protection relays in the facility gives a malfunction, and turns off if no relay gives a malfunction.