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Context is needed here. From your other questions, I assume this is related to power system protection. MTA in this siatuation is usually used to refer to the "maximum torque angle". For distance type protective relays, the MTA is chosen to be near the line angle if the line impedance were drawn out on the X-R plane; this is usually a fixed value in electomechanical relays, often at 60 or 75 degrees.

I am not familiar with "RCA" in a power context. Again, context would help when dealing with acronyms.

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14y ago

What else can I help you with?