Description
RET670 1MRK004816-AC: Product Overview
The ABB RET670 1MRK004816-AC is a high-performance transformer protection IED designed for critical power system applications. As part of ABB’s legacy transformer protection portfolio (now continued by Hitachi Energy), it serves as a “guardian” for power transformers, ensuring reliable operation by detecting and mitigating faults (e.g., internal short circuits, overvoltages) in real time.
Role in Automation Systems:
Positioned as a core protection device in substation automation systems, the RET670 1MRK004816-AC performs three primary functions:
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Fault Detection: Monitors transformer parameters (current, voltage, temperature) to identify abnormalities (e.g., differential current imbalances, overfrequency).
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Protection Action: Initiates fast tripping of circuit breakers to isolate faulty transformers, preventing damage to equipment and grid instability.
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Monitoring & Diagnostics: Provides real-time data on transformer health (e.g., winding temperature, oil level) and logs events for post-fault analysis.
Core Functionality:
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Differential Protection: Uses high-sensitivity algorithms to detect internal transformer faults (e.g., winding shorts) with fast response times (<20 ms).
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Restricted Earth Fault (REF) Protection: Covers low-impedance and high-impedance REF scenarios, ensuring comprehensive ground fault detection.
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Overexcitation Protection: Monitors transformer voltage and frequency to prevent damage from prolonged overexcitation (e.g., during grid disturbances).
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Communication Integration: Supports multiple protocols (IEC 61850, DNP3) for seamless integration with SCADA systems and remote monitoring platforms.
ABB 1MRK004816-AC
Platform Benefits (ABB Transformer Protection Portfolio):
The RET670 1MRK004816-AC leverages ABB’s expertise in power protection, offering:
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Proven Reliability: Used in thousands of substations worldwide, with a track record of reducing transformer failure rates by up to 30%.
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Flexibility: Adapts to various transformer types (two-winding, autotransformers) and system configurations (multi-breaker, multi-terminal).
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Legacy Support: Despite being in the later stages of its lifecycle, it remains compatible with existing ABB protection systems (e.g., REF615, REL670).
Technical Specifications
Model Number: RET670 1MRK004816-AC
Manufacturer: ABB (now Hitachi Energy)
Product Type: Transformer Protection IED
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Rated Current (Ir): 1 A or 5 A
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Rated Voltage (Ur): 110 V AC
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Frequency: 50/60 Hz ± 5%
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CT Inputs: Up to 6 three-phase current inputs (5 A or 1 A)
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VT Inputs: Up to 3 three-phase voltage inputs (110 V AC)
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Communication Protocols: IEC 61850 (Edition 1/2), SPA, LON, DNP3, IEC 60870-5-103
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Operating Temperature: -25°C to +55°C (-13°F to 131°F)
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Storage Temperature: -40°C to +85°C (-40°F to 185°F)
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Humidity: 5–95% non-condensing
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Dimensions (W×H×D): 265.9 mm × 223.7 mm × 242.1 mm (10.47 in × 8.81 in × 9.53 in)
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Weight: 10 kg (22 lbs)
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Certifications: CE, UL, IEEE 1588 V2
Core Features & Customer Value
1. Fast & Accurate Fault Detection:
The RET670 1MRK004816-AC’s differential protection algorithm detects internal transformer faults with a sensitivity of 10% of the rated current, ensuring early intervention before damage occurs. For example, in a power plant, this feature can prevent a generator-transformer unit from failing during a short circuit, avoiding costly downtime.
2. Comprehensive Protection Coverage:
With support for REF, overexcitation, and overcurrent protection, the device addresses all major transformer fault scenarios. This reduces the need for multiple protection devices, simplifying system design and lowering costs.
3. Seamless Communication:
IEC 61850 support enables real-time data exchange with SCADA systems, allowing operators to monitor transformer health remotely. This is critical for unmanned substations, where remote diagnostics can reduce maintenance trips by up to 50%.
4. Legacy System Compatibility:
The device integrates with existing ABB protection systems (e.g., REF615), allowing utilities to upgrade their protection infrastructure without replacing the entire system. This extends the lifespan of existing assets and reduces capital expenditure.
ABB 1MRK004816-AC
Typical Applications
The ABB RET670 1MRK004816-AC is widely used in:
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Power Generation: Protects generator-transformer units in thermal power plants, ensuring reliable power supply to the grid.
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Transmission Substations: Monitors and protects high-voltage transformers (110 kV–500 kV) in regional grids.
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Industrial Facilities: Safeguards transformers in steel mills, chemical plants, and data centers, where uninterrupted power is critical.
