ABB RTD0003 RTD Temperature Input Card 

RTD0003 is a dedicated temperature measurement plug-in card for ABB Relion 620 series protection IEDs, used to collect resistance temperature detector signals from transformers, generator bearings and power equipment. It supports multi-type 2/3-wire RTD sensors, converts resistance variation into digital temperature data for relay logic judgment and temperature overheat protection, with built-in signal filtering and galvanic isolation to resist substation electromagnetic interference.

This slot-type auxiliary board integrates 6 RTD measurement channels plus 2 analog 4–20mA auxiliary signal ports, matching all Relion 620 series protection devices. It adopts high-precision constant current sampling circuit with ±0.6% full-scale measurement error, and transmits real-time temperature data to the main protection CPU for over-temperature alarm and trip interlock. It is a standard maintenance spare for power plant and substation transformer protection cabinets.

Main Specifications

• Brand: ABB; Model: RTD0003; Matching Series: Relion 620 Protection Relay IED;In stock
• Channel Layout: 6 RTD temperature input channels + 2-channel 4–20mA analog auxiliary input
• Supported Sensors: Pt100, Pt1000, Ni100, Ni1000, compatible with 2-wire & 3-wire wiring modes
• Measurement Accuracy: ±0.6% FS (3-wire connection), temperature resolution 0.1℃
• Isolation Design: Galvanic isolation between field sensors and relay internal control circuit
• Signal Filter: Built-in low-pass filter, -3dB cutoff at 3.6kHz to suppress high-frequency noise
• Module Refresh Speed: All channels complete data ｕｐｄａｔｅ within 1 second
• Max Sensor Power Consumption: ≤1mW per channel to avoid self-heating measurement deviation
• Operating Environment: -25℃ ~ +70℃, humidity 5%~95% non-condensing, high EMC immunity
• Installation: Internal plug-in slot of Relion 620 protection device, no extra rack required

Core Functions

• Real-time collect winding, oil tank and bearing RTD temperature signals of main transformers, generators and high-voltage motors in power stations.
• Constant current sampling circuit converts resistance changes of temperature sensors into standardized digital temperature values for relay processing.
• Support multi-level over-temperature logic configuration: early warning alarm, over-temperature blocking and extreme high-temperature trip interlock protection.
• Dual analog 4–20mA channels access auxiliary process temperature signals from on-site cooling and lubrication systems for comprehensive equipment monitoring.
• Isolation filter circuit eliminates surge interference induced by power cable and CT secondary circuits, ensuring stable temperature measurement under harsh substation conditions.
• Temperature historical data storage function records equipment temperature curve, supporting post-fault analysis of transformer overheating and insulation aging faults.

Application Scenarios

• Spare temperature acquisition card replacement for Relion 620 series transformer differential protection relays (SPAD346C3 matching cabinet).
• Bearing and winding temperature monitoring spare parts for thermal/hydropower station generator protection IEDs matched with UNITROL1000 excitation systems.
• Maintenance backup stock for petrochemical, metallurgical plant self-owned power station high-voltage motor and distribution transformer protection devices.
• Matching temperature measurement plug-in cooperating with ABB Advant OCS DCS, PM511 CPU and PP836 local HMI monitoring panel.
• Retrofit overhaul components for wind farm booster station, waste heat power station and cement kiln auxiliary transformer protection cabinets.

• Global aftermarket spare inventory for power grid and heavy industry maintenance workshops maintaining ABB Relion series protection hardware.