Rtd/Ma Inputs; Functionality; Operation Principle - ABB RELION 620 Series Technical Manual

Protection and control

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1MRS757644 H

Figure 43: Signal output in BIO0005

RTD/mA inputs

The RTD and mA analog input module is used for monitoring and metering current

(mA), temperature (°C) and resistance (Ω). Each input can be linearly scaled for

various applications, for example, transformer's tap changer position indication.

Each input has independent limit value supervision and deadband supervision

functions, including warning and alarm signals.

All the inputs of the module are independent RTD and mA channels with individual

protection, reference and optical isolation for each input, making them galvanically

isolated from each other and from the rest of the module. However, the RTD inputs

share a common ground.

Technical Manual

Basic functions