Description:
The ABB 1MRK002239-BBR01, also referenced by its type code SR91C790, is a rack-mount Power Supply Module (PSM — Power Supply Module / Protection System Module) manufactured by ABB for use in ABB Relion® 670 series Intelligent Electronic Devices (IEDs), protection relay subracks, and certain DCS/automation backplanes. It converts a wide-range AC or DC input (typically 110–250 V DC / 85–264 V AC) into regulated internal DC rails—commonly +5 V, ±12 V, and +24 V—to power the processor, communication cards, and binary I/O modules housed in the same rack, with galvanic isolation and built-in overload protection.
Application Scenarios:
In a 220 kV substation, a RED670 line differential protection IED suddenly went dark during a routine secondary system inspection—traced to a failed rack power supply that had been in service for 18 years. Because the station battery voltage (220 V DC) fluctuates during switching operations, the replacement unit must tolerate wide input swings and provide clean, isolated DC to the sensitive protection electronics. The maintenance team installed the ABB 1MRK002239-BBR01 (SR91C790) as a direct like-for-like swap into the dedicated PSM slot of the Relion 670 rack. The module accepted the 220 V DC station battery without adjustment, locked into the backplane, and the IED booted normally within seconds—all binary status LEDs confirming “Power OK.” The wide-input tolerance and >40 ms ride-through capability of the 1MRK002239-BBR01 now protect the IED from momentary battery sags during breaker closing, directly addressing the pain point of unexplained protection-drop events during heavy switching operations.
Parameter:
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1MRK002239-BBR01 (Type: SR91C790) |
| Manufacturer | ABB (Sweden / Power Systems / Protection & Control Division) |
| Product Category | Rack-Mount Power Supply Module (PSM) for Relion 670 / Protection Subrack |
| Input Voltage | 110–250 V DC (typical BBR version) / 85–264 V AC (auto-ranging, 47–63 Hz) |
| Output Rails | Regulated multi-rail DC — typically +5 V, +12 V, –12 V, +24 V (internal backplane distribution) |
| Output Power | Approx. 40–60 W total (sufficient for processor + comm + I/O cards in one IED rack) |
| Ride-Through Time | > 40 ms @ nominal input (bridges brief DC bus dips) |
| Galvanic Isolation | Input–Output ≥ 1500 V AC (per IEC 60255), protects sensitive backplane electronics |
| Protection Features | Overcurrent, short-circuit, overvoltage, overtemperature; internal fail contact / signal |
| Status Indication | Front-panel LED (Power OK / Fail) + optional “Internal Fault” relay contact to SCADA |
| Cooling / Enclosure | Natural convection (fanless); metal-shielded plug-in module with locking screw |
| Mounting Method | Dedicated PSM slot in ABB Relion 670 / 650 series rack or compatible protection subrack |
| Operating Temperature | –40 °C to +70 °C (IEC 60255 grade for substation environments) |
| Dimensions (approx.) | 138 × 60 × 15 mm (H × W × D); Weight ≈ 0.20–0.35 kg |
| Certifications | CE, cULus, IEC 60255 EMC/Insulation compliant, RoHS |
Technical Principles and Innovative Values:
- Innovation Point 1: Wide DC/AC Input with Ride-Through for Substation Battery Systems. The ABB 1MRK002239-BBR01 is specifically engineered to accept the typical 110 V DC or 220 V DC station battery supply—as well as universal AC—and includes bulk capacitance for >40 ms hold-up during switching transients, preventing nuisance IED resets that plague generic switched-mode supplies in switchyards.
- Innovation Point 2: Multi-Rail Regulated Outputs with Galvanic Isolation. Unlike a simple 24 V DC brick PSU, the SR91C790 generates and stabilizes all the internal voltage rails (+5 V logic, ±12 V analog/I/O, +24 V auxiliary) required by the rack’s mixed-signal cards, with full galvanic isolation from the station battery—protecting sensitive A/D converters from ground-loop-induced noise.
- Innovation Point 3: Backplane Integration & Self-Diagnostics with Fail Signaling. The module plugs directly into the system backplane and is recognized by the IED firmware. An internal watchdog monitors output regulation; if an undervoltage or overtemperature condition occurs, the front LED changes state and a dry-contact / logic-level “Internal Fault” signal can be wired to the station DC & S system—turning a silent PSU failure into a logged alarm before the IED loses power.
