Product Core Brief
- Model: RET670 1MRK004816-AC (Alias: A30, 2W/1CB, Firmware V1.2)
- Brand: ABB Hitachi Energy
- Series: Relion® 670 Series High-End Transformer Protection & Control IED
- Core Function: Pre-configured dedicated IED for two-winding transformer single breaker bay schemes, providing main differential protection, backup phase/earth fault protection, transformer overexcitation supervision, breaker control, disturbance recording and full IEC 61850 digital substation communication for distribution/transmission power transformers.
- Product Type: Draw-out Modular Transformer Protection IED (Main Unit + Matching Terminal Baseplate)
- Key Specs: V1.2 firmware; 2-winding single breaker preset logic; universal AC/DC auxiliary supply; dual fiber DDCS + Ethernet IEC 61850; built-in CT ratio & vector group auto compensation
- Note: Mature legacy production version V1.2; limited factory new residual stock and fully bench-tested surplus available for power substation transformer bay maintenance; succeeded by newer V2.2 hardware variantsABB Group.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Full OEM Part Number | 1MRK004816-AC, Type Code A30 2W/1CB V1.2 |
| Target Application | 2-winding power transformer, single circuit breaker bay layout |
| Auxiliary Supply Range | 90–250 V AC/DC universal wide-range input; max 50W peak power consumptionManualsLib |
| CT Input Standard | Software selectable 1A / 5A secondary current; auto vector group & CT ratio matching without interposing CTs |
| Analog Measurement Channels | Multi-group galvanic CT/VT inputs for HV/LV winding current, busbar voltage, residual neutral current |
| Binary I/O Configuration | Expandable modular DI/DO card slots; high-speed trip outputs, breaker control, alarm, trip circuit supervision relays |
| Core ANSI Transformer Protection Suite | 87T low-impedance transformer differential (2nd/5th harmonic restraint for inrush & overexcitation), 64REF restricted earth fault, 50/51 phase overcurrent backup, 51N directional earth fault, 24 overexcitation (V/Hz), 50BF breaker failure, 25 synchrocheck, 46 negative sequence unbalance, 27/59 under/overvoltage, thermal overload 49 |
| Onboard Communication Interfaces | Dual multi-mode fiber DDCS bus; RJ45 Ethernet IEC 61850 Ed1.0 (GOOSE/MMS/SNTP); IRIG-B optical/electrical time sync; SPA front service port; RS485 Modbus/DNP3.0 |
| Fault & Event Storage | 1000 non-volatile timestamped SOE event records; multi-channel COMTRADE disturbance waveform recorder for transformer internal & external faultsManualsLib |
| Draw-out Mechanical Design | Plug-in withdrawable structure; baseplate integrated CT shorting links for safe hot maintenance without CT open-circuit hazard |
| Front Panel HMI | Full graphical multi-language LCD, local breaker open/close pushbuttons, customizable LED fault status indicators |
| Enclosure Rating | Front panel IP54 flush cabinet mount; rear terminal compartment IP20 |
| Operating Ambient Temperature | -10 °C ~ +55 °C continuous rack operation; storage -40 °C ~ +85 °C |
| Mechanical Form Factor | 6U half-width 19-inch standard panel draw-out assembly |
| Unit Dimensions | 119 mm W × 186 mm H × 135 mm D |
| Net Weight (IED Only) | ~1.0 kg; full assembly (IED + baseplate) ~3.8 kg |
| Compliance Standards | IEC 60255, IEC 61850, ANSI C37 series, KEMA fully type-tested, SIL2 capable, RoHSeero |
Product Introduction
1MRK004816-AC is a factory pre-configured V1.2 version transformer protection IED optimized exclusively for two-winding transformers with one main circuit breaker, widely applied in industrial distribution substations, wind farm step-up transformers and urban transmission grid transformer bays.
Its core low-impedance differential protection adopts dual harmonic restraint logic: 2nd harmonic blocks magnetizing inrush false tripping during transformer energization, while 5th harmonic suppresses overexcitation operation caused by grid overvoltage, greatly improving protection selectivity compared to traditional discrete relay schemes. Built-in automatic CT ratio compensation and vector group correction eliminate the need for external interposing CTs, simplifying site wiring and commissioning.
Dual fiber DDCS communication provides strong anti-electromagnetic interference for long-distance substation bay interlocking, while Ethernet IEC 61850 supports GOOSE fast cross-bay trip signal transmission for digital substations. The embedded graphical FUPLA logic editor realizes custom bay automation functions such as transformer parallel interlock, tap-changer supervision and auto-switching control, replacing bulky auxiliary relay racks.
The withdrawable baseplate reserves all CT/VT and control wiring permanently on cabinet terminals, with mechanical CT shorting links to avoid lethal high open-circuit voltage during IED replacement. All fault waveforms, transformer running hours and protection setting groups are stored in non-volatile flash and retained through complete auxiliary power outages.
QA & Testing SOP (Transparency Building)
- Incoming Inspection: Cross-reference full part number 1MRK004816-AC, firmware V1.2 and matched baseplate serial numbers against OEM spare registry to reject mismatched counterfeit assemblies; inspect LCD screen, fiber transceiver ports, CT shorting links and PCB conformal coating for scratches, salt corrosion or moisture traces; log serial batches for full traceability.
- Live Full Assembly Testing: Mount IED + baseplate to standard 6U test rack, supply stabilized 220V AC/DC auxiliary power, inject multi-stage CT/VT simulated transformer inrush, internal winding short-circuit, earth fault and overexcitation signals; run continuous 24-hour protection element cycling, fiber DDCS & Ethernet communication stress testing with disturbance recorder full validation.
- Electrical Testing: Use Fluke multimeter and insulation resistance tester to verify chassis ground resistance ＜0.5Ω and isolation resistance ＞10MΩ between auxiliary power, analog measurement and binary control circuits; test continuity of baseplate CT shorting links.
- Firmware/Config Backup: Record embedded V1.2 firmware revision via PCM600 engineering tool, photograph baseplate fiber/Ethernet communication DIP address jumpers, export full differential protection curves, harmonic restraint thresholds and custom bay logic to encrypted offline storage.
- Final QC & Packaging: Clean front LCD surface with anti-static microfiber cloth, cap fiber optical ports with dust protective plugs, separate plug-in IED and baseplate into independent ESD shielding bags, attach unified printed QC test tag with technician ID and full 24-hour runtime timestamp before foam-lined shockproof carton packaging.
Installation Pitfalls & 4-Step Replacement Guide
Common Installation Risks
❗ Firmware Version Mismatch: V1.2 firmware cannot be fully edited by newer PCM600 software versions; mismatched software will disable differential harmonic restraint and IEC 61850 communication functions; confirm tool compatibility before downloading transformer parameters.❗ CT Open-Circuit Safety Hazard: Must fully engage baseplate CT shorting links before extracting the plug-in IED; unshorted CT terminals generate lethal high secondary voltage and severe arc flash hazards during disassembly.❗ Fiber DDCS Port Cross-Wiring: Swapping master/follower fiber ports leads to complete bay communication loss and protection interlock failure; label fiber jumpers during disassembly to match rear panel silkscreen marks.❗ Transformer Vector Group Parameter Misconfiguration: This unit is preset for two-winding transformers; wrong vector group setting will cause differential protection steady-state unbalance and misoperation.❗ Communication Bus Address Conflicts: Duplicate bay node addresses flood substation Ethernet/fiber bus with broadcast noise; take clear photos of baseplate DIP jumpers before removal.❗ Auxiliary Supply Underrating: Peak 50W power draw during simultaneous multi-trip output actuation; shared cabinet DC power supplies with multiple IEDs trigger voltage sag and incomplete IED boot sequences.❗ ESD Damage Risk: Ungrounded contact with rear exposed PCB traces corrupts differential protection logic and permanent fault history storage.
4-Step Draw-out Assembly Replacement
- Pre-install: Lock out and tag substation auxiliary power supply, engage baseplate CT shorting links, wear certified anti-static wrist strap, photograph CT/VT measurement wiring, DI/DO control terminals, dual fiber DDCS and Ethernet communication jumper positions.
- Removal: Unlatch draw-out mechanical handle, pull the plug-in unit fully out of the fixed wired baseplate (baseplate remains hardwired to cabinet; only replace baseplate if terminals show corrosion or burn damage).
- Install: If reusing original baseplate: slide new IED into rail and lock handle, replicate original fiber/Ethernet DIP bus address jumpers. If replacing full kit: mount new baseplate to cabinet panel frame, reterminate all CT/VT and control wiring, set communication bus address jumpers, then insert and lock the new IED unit.
- Power-on Test: Restore auxiliary cabinet power, disengage CT shorting links, upload matched V1.2 firmware and transformer differential protection setting groups, inject simulated winding short-circuit, earth fault and magnetizing inrush test signals to verify trip output operation, test stable GOOSE cross-bay interlock and fiber DDCS communication, confirm complete fault waveform recording.
FAQ
Q: What does 1MRK004816-AC A30 2W/1CB stand for?
- A30: Standard transformer protection hardware platform
- 2W: Pre-configured logic for two-winding transformers
- 1CB: Single circuit breaker bay layout
- AC: Universal 90–250V AC/DC auxiliary power variant
- V1.2: Embedded firmware version 1.2
Q: Can this unit protect three-winding transformers?A: No, the 1MRK004816-AC factory preset logic only supports two-winding transformers. Three-winding transformer projects require other order codes with 3W preset configuration.
Q: Can the plug-in IED be hot-swapped with auxiliary power energized?A: The draw-out mechanical design allows live extraction only after fully locking CT shorting links. Never pull the IED without shorting CT circuits; full cabinet lockout/tagout is mandatory for complete baseplate replacement.
Q: What warranty coverage applies to stocked full assemblies with baseplate?A: Factory-new OEM legacy IED kits carry a 12-month manufacturer warranty covering differential CPU, fiber transceivers, relay outputs and baseplate terminal assembly. Bench-tested surplus full assemblies ship with a 6-month functional warranty; damage from CT open-circuit transients, miswiring, arc flash or ungrounded ESD handling voids all warranty terms.
Q: Has ABB discontinued V1.2 series?A: V1.2 firmware hardware is end-of-production; ABB has launched updated V2.2 series supporting HSR/PRP redundant Ethernet and IEC 61850 process bus. The 1MRK004816-AC variant is only supplied as spare parts for legacy transformer bays.
Q: Will transformer differential curves and harmonic restraint parameters retain after swapping the plug-in IED?A: All transformer protection tuning data, vector group settings and fault thresholds store in the plug-in IED’s internal flash memory. Back up the full project database from the old unit before removal and re-download to the new IED post-install; firmware version mismatch will corrupt parameter upload sequences and disable differential protection.
Q: What communication protocols are supported?A: Dual fiber DDCS for bay interlocking; Ethernet IEC 61850 Ed1.0 (GOOSE/MMS/SNTP); rear RS485 supports Modbus RTU & DNP3.0 serial; front SPA optical port for local on-site commissioning; IRIG-B time synchronization interface.
Q: Can 1MRK004816-AC be used for feeder or motor protection?A: Not recommended. Its entire algorithm stack is optimized for transformer differential, inrush restraint and overexcitation protection. Feeder protection uses REF615/REF630 series IEDs, motor protection uses REM610/REM615 dedicated motor IEDs.
