The REF615E merging unit collects and digitizes signals from current and voltage transformers. This unit feeds sampled values to protection and control devices over IEC 61850 networks. Engineers specify it for modern digital substations and industrial power systems.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Merging Unit |
| Compatibility | ABB Protection and Control Systems |
| Standard | IEC 61850-9-2 Sampled Values |
| Analog Inputs | Phase Currents, Earth Current, Voltages |
| Digital Interface | Ethernet Ports, Fiber Optic Connections |
| Dimensions | 220 mm x 160 mm x 180 mm |
| Weight | Approximately 2.20 kg |
| Component Count | 136 Active Electronic Components |
| Energy Storage | 3.0 V Lithium Backup Battery |
| Power Consumption | 110–240 VAC / 110–250 VDC, 15 VA |
| Operating Temperature | -25°C to 55°C |
| Relative Humidity | 5% to 95%, Non-Condensing |
Signal Acquisition and Processing
The unit samples analog currents and voltages at high rates for accurate capture. Therefore, it digitizes transformer outputs before sending them across the station bus. Furthermore, 136 active components handle conversion, timing, and network framing tasks. Consequently, protection devices receive clean, synchronized measurement data.
Interface and Communication
Ethernet and fiber optic ports link the REF615E to protection relays and station networks. As a result, sampled values travel without electromagnetic interference from power cables. Additionally, redundant network paths improve availability in critical substations.
Power and Environmental Ratings
The unit accepts 110–240 VAC or 110–250 VDC auxiliary supply options. Moreover, it operates from -25°C to 55°C inside switchgear buildings. Consequently, it suits both indoor bays and protected outdoor cabinets.
Installation Notes
Operators mount the unit into a standard panel cutout with rear connections. The sealed front face resists dust and humidity in substation rooms. However, users should verify fiber optic connector types before commissioning the network.
Details
| Weight | 0.6 kg |
|---|---|
| Dimensions | 180 × 110 × 20 mm |
