Welcome, Alejandro, to the OEM forum.
What I think you have is in fact a common 3-phase electricity supply. But I am sorry - you do not have the voltages correct. It is impossible to have 120 V Line - Neutral and 240 V Line - Line. I think you will have 127 V Line - Neutral and 220 V Line - Line.
What do you want to measure, exactly? If you only want the power and energy consumption for the whole house, then you have two choices:
If you are happy to have a solution which will be slightly less accurate, you can have an emonTx with one a.c. adapter to measure the voltage and 3 × current transformer to measure the current on each incoming 127 V line. You will need the 3-phase sketch uploaded to the emonTx. There will be a small inaccuracy because the software will measure the voltage of line 1 and assume the voltages of lines 2 & 3 are the same - which might not be true.
If you want to measure individual circuits, or you want better accuracy for the whole house, then you will need 3 × emonTx, using one for each incoming 127 V line. Each emonTx will need an a.c. adapter to measure the voltage and 1 × current transformer to measure the current on the incoming 127 V line. The three together will again give you the total power and energy for your house. Each emonTx has 4 current inputs, so you have 1 measuring the main current and 3 more on each emonTx that you can use to measure the current on individual 127 V circuits on that phase. (You cannot get the correct power if you mix current and voltage on different phases.)
If your electricity distribution board allows it, you might be able to bunch a group of individual circuits on the same phase and measure the total power for the group with one current transformer.
You will also need something to record the data so that you can view it. For that, you need an emonBase. This is a Raspberry Pi equipped with a radio receiver to receive the data from one or more emonTx.
And you will need a programmer and cable to set up the emonTx, and a power supply for your emonBase.