ABB Relion 620 Series - Rtd;Ma Inputs; Functionality; Operation Principle

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X110
SO1
SO2
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X110
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Figure 43: Signal output in BIO0005
3.13 RTD/mA inputs
3.13.1 Functionality
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.
3.13.2 Operation principle
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.
1MRS757644 H
Basic functions
620 series
Technical Manual
119