Description
1. Product Overview
ABB RXEDK 2H 1MRK000841-KA is a dedicated front-end test interface module matched with ABB Relion 650/670 series relay protection devices, serving as a standardized auxiliary component for secondary circuits of power system relay protection. Designed for REL670, REL650 series integrated devices including line protection, differential protection, distance protection and control & protection units, this module acts as an extended test interface unit on the device front panel. It enables standardized external access to internal sampling circuits, logic circuits and trip circuits of protection devices, and constitutes core auxiliary hardware for commissioning, periodic inspection, testing and fault verification of relay protection equipment in substations.
As a dual-port standard test interface module, RXEDK 2H integrates two RJ45 test communication ports and a dedicated external test terminal block. External access and testing of analog inputs, binary inputs/outputs and logic signals of the protection device can be realized without disconnecting internal wiring of the unit. The module fully complies with ABB native bus protocols and circuit definitions for protection devices, featuring standardized wiring and accurate signal mapping with excellent compatibility. It is widely adopted in new projects, technical renovation & expansion, legacy equipment replacement and annual periodic inspection for relay protection systems in power substations, auxiliary power systems and industrial & mining distribution rooms. It effectively streamlines protection commissioning procedures, mitigates risks brought by disassembly and reconnection of secondary wiring, and improves the safety and standardization of relay protection verification.
2. Technical Features
2.1 Precise OEM Matching, Dedicated Support for Protection Equipment
Custom-engineered for the full range of ABB Relion 650/670 series relay protection devices. Signal allocation, circuit assignment, communication timing and electrical parameters fully conform to original specifications without protocol deviation or mapping mismatch. It perfectly fits multiple types of devices including line protection, busbar protection, distance protection, differential protection and integrated control & protection units. As an official standard test accessory for ABB relay protection systems, it delivers superior adaptability compared with generic adapter modules.
2.2 Integrated Dual-Interface Design for Efficient Commissioning
Adopting the RXEDK 2H dual-port architecture, the module integrates 2 dedicated standard RJ45 test ports plus an external high-density test terminal block. It enables one-stop external routing of analog signals, binary signals, trip signals, interlock signals and communication signals from the protection device. Commissioning can be carried out without opening the rear panel, modifying secondary wiring or loosening terminals, greatly simplifying relay protection trip tests, sampling verification and logic tests, and shortening maintenance and periodic inspection duration.
2.3 Electrically Isolated Safety Design to Eliminate Secondary Circuit Hazards
Built-in independent electrical isolation separates test circuits from operational circuits of the device. Testing activities will not interfere with normal operation of the protection unit. It prevents potential risks such as unintended protection operation, device damage and circuit short-circuit caused by accidental contact, shorting or signal cross-feed during testing. It fundamentally resolves secondary circuit safety risks arising from conventional open-panel and wiring-disconnect testing, complying with safety operation codes for substation relay protection.
2.4 Standardized Circuit Routing Compatible with Various Test Equipment
All test points are defined in accordance with industry standards for power relay protection testing. Direct connection is supported for various microprocessor-based relay protection testers, analog signal generators, circuit calibrators and other professional test instruments. It supports full-range tests including sampling accuracy verification, protection logic tripping tests, setting value verification, trip circuit testing, communication link inspection and circuit integrity check, offering broad compatibility with mainstream power test equipment.
2.5 Industrial-Grade Robust Construction for Long-Term Substation Operation
Constructed with power-grade reinforced structure and flame-retardant insulating materials, the module has passed stringent tests covering high-voltage insulation, humidity resistance and electromagnetic compatibility. It withstands strong electromagnetic environments, temperature fluctuations and continuous energized operation inside substation cabinets. Free of mechanically wearing components, it adopts maintenance-free design to support 7×24-hour stable continuous operation in substations, balancing practicality for commissioning and long-term operational reliability.
2.6 Non-Destructive In-Situ Installation for New & Legacy System Retrofits
Modular flush mounting fits the standard expansion slot on the front panel of 650/670 series protection devices. In-situ installation requires no cabinet modification or alteration to secondary wiring, and exerts no impact on existing protection logic and operation modes. It can be directly deployed for technical upgrade of legacy protection equipment, matching newly installed protection devices and faulty module replacement. Easy installation achieves zero-risk renovation, suitable for intelligent and standardized transformation projects of various substations.
3. Technical Specifications
3.1 Basic Specifications
Model: RXEDK 2HPart Number: 1MRK000841-KABrand: ABBProduct Type: Dedicated Test Interface Module for Relay Protection DevicesApplicable Equipment: ABB Relion 650/670 Series Integrated Relay Protection & Control DevicesFunctions: External routing of protection circuits, relay protection commissioning, setting value verification, trip tests, circuit inspectionStructure: Flush-mount front panel expansion moduleCore Advantages: OEM compatibility, electrical isolation, efficient commissioning via dual interfaces, non-destructive installation, safe and reliable
3.2 Interface & Circuit Parameters
Communication Test Ports: 2 off standard dedicated RJ45 test portsExternal Test Terminal Block: High-density standardized signal terminalsRouted Circuits: Analog sampling circuits, binary input circuits, binary output circuits, trip & interlock circuits, communication signal circuitsInterface Standard: ABB original dedicated test bus interface with fully matched protocolsCircuit Isolation: Full electrical isolation for all test circuits; no mutual interference between operational and test circuitsWiring Standard: Compliant with secondary circuit wiring specifications for power relay protection
3.3 Electrical Performance Parameters
Insulation Class: Power-grade high-voltage insulation design, withstands rated voltage of secondary circuitsWithstand Voltage Performance: Meets substation secondary circuit withstand voltage standards; no breakdown or leakageSignal Accuracy: Zero attenuation and distortion of signal transmission within test circuits to guarantee test precisionAnti-Interference Capability: Built-in electromagnetic shielding to resist strong electromagnetic interference in substationsElectrical Safety: Protection against short-circuit, cross-feed and accidental contact, complying with power safety operation standards
3.4 Mechanical & Mounting Parameters
Mounting Method: Flush snap-in installation on front panel of protection deviceHousing Material: Flame-retardant, insulating and anti-ageing industrial engineering plasticStructural Feature: Compact lightweight design without occupying extra cabinet spaceTerminal Layout: Zoned standardized arrangement with separation of strong and weak signals for clear wiringCompatible Slot: Standard expansion slot for 650/670 series devices, perfect in-situ fit
3.5 Environmental Specifications
Operating Temperature: -25℃ ~ +70℃Storage Temperature: -40℃ ~ +85℃Operating Humidity: 5% ~ 95% RH (non-condensing, no corrosive gas)Environmental Resistance: EMI immunity, humidity resistance, dust resistance, vibration resistance, suitable for indoor cabinet application in substationsOperation Mode: Continuous energized stable operation, maintenance-free without performance degradation
4. Operating Principle
The ABB RXEDK 2H 1MRK000841-KA test interface module operates based on OEM circuit mapping and electrical isolation principles. After being inserted into the front panel expansion slot of the protection device, the module precisely maps all sampling, logic and trip circuit signals of the unit via an internal dedicated bus. Without modifying internal device wiring or disturbing original protection logic, all internal test points are fully routed to external RJ45 ports and test terminal blocks.
Equipped with independent electrical isolation units, the module strictly separates operational circuits and test circuits. Under normal operating conditions, the module only performs signal mapping, does not participate in protection logic calculation and imposes no influence on device operation. During relay protection commissioning and periodic inspection, relay protection testers can be connected via external interfaces to conduct full verification including analog injection, binary signal triggering, logic tripping and trip circuit testing. Test signals are confined within isolated test circuits and cannot leak into operational circuits to cause unintended equipment operation. Upon completion of testing, external equipment can be removed directly without wiring restoration, enabling safe, efficient and non-destructive relay protection testing.
5. Application Scenarios
5.1 Routine Periodic Inspection & Commissioning of Substation Relay Protection
Widely used for annual inspection, quarterly verification and routine commissioning of ABB 650/670 series protection devices in grid substations and auxiliary power stations. It replaces conventional testing requiring panel opening and wiring disconnection, significantly improving protection verification efficiency, eliminating poor contact, wiring errors and hidden circuit risks caused by repeated wiring disassembly, and ensuring standardized and normalized inspection of relay protection equipment.
5.2 Supporting Component for New-Build Protection Projects
As a standard accessory for relay protection systems in newly built substations and distribution rooms, it supports factory commissioning, site installation testing and pre-commissioning full-range tests. It provides standardized test interfaces for setting configuration, logic validation, circuit tripping tests and system joint commissioning, ensuring zero hidden troubles before commissioning of new equipment.
5.3 Technical Renovation & Upgrade of Legacy Protection Systems
For legacy ABB protection devices lacking external test interfaces which bring cumbersome commissioning and high operational risks, in-situ installation of this module realizes standardized upgrade. No secondary circuit or cabinet reconstruction is required to achieve standardized test interfaces for protection equipment at low cost, improving operation convenience and system safety level.
5.4 Fault Investigation & Testing for Relay Protection
In cases of abnormal protection device status, circuit faults, protection failure to operate or unintended tripping, test instruments can be rapidly connected via external interfaces to accurately verify sampling accuracy, logic programs, circuit continuity and trip performance. It accelerates fault localization and troubleshooting to guarantee stable operation of power systems.
5.5 Regular Spare Parts for Power Facilities
As an exclusive supporting module for ABB 650/670 protection devices with high irreplaceability and versatility, it serves as standard spare inventory for power operation & maintenance enterprises and substations. Aged, damaged or interface-faulted modules can be quickly replaced to restore standardized commissioning functions and ensure normal maintenance of relay protection systems.
