In order to protect a power transformer with a voltage of 10/0.4 kV, there is an overcurrent relay on the secondary side of the current transformers with appropriate ratios for each phase on the 10 kV side. In addition, there are three Undervoltage relays connected between A, B, and C phases 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, when necessary, in the control and signal circuits of each protection relay. 2 N.A. and 2 N.K. has contacts. According to the information given, Draw the three-phase diagram of the facility. 

At least one of the 6 protection relays in the facility, which is directly controlled by the breaker opening coil, Draw a circuit breaker control circuit in which the protection relay(s) will open the breaker by controlling the breaker opening coil when a malfunction occurs in the working areas. 

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 has given a malfunction.