ABB 1MRK000195-AAr02 Protection Control Board – REB REL REF Series

ABB 1MRK000195-AAr02 / 1MRK000005-63 Protection & Control Board — Core Signal Processing Node in Numerical Relay Architectures

The ABB 1MRK000195-AAr02 (reference: 1MRK000005-63) is a protection and control board engineered for deployment within ABB’s REB, REL, and REF numerical relay platforms. Its primary function is to serve as the signal conditioning and logic execution layer between field-side analog inputs and the relay’s central processing unit. In a typical protection relay, this board receives raw current and voltage signals from instrument transformers, applies anti-aliasing filtering, performs analog-to-digital conversion, and passes structured data frames to the main CPU over the relay’s internal parallel bus. The board’s architecture is optimized for deterministic latency — a non-negotiable requirement in protection applications where operate times are measured in milliseconds.

Unlike general-purpose embedded boards, the 1MRK000195-AAr02 is designed to IEC 60255 standards, meaning its signal chain is calibrated for the specific dynamic range and frequency response demanded by power system protection. The board handles both steady-state metering accuracy and transient fault capture simultaneously, without saturation or aliasing artifacts that would compromise protection selectivity.

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Technical Parameters

Hardware Logical Analysis

The 1MRK000195-AAr02 board implements a multi-layer hardware defense strategy that addresses the three primary failure modes in substation environments: conducted interference, radiated electromagnetic fields, and electrostatic discharge.

Galvanic Isolation Architecture: All analog input channels are galvanically isolated from the board’s digital logic domain via precision miniature current and voltage transformers mounted directly on the PCB. This isolation barrier sustains a 2 kV AC dielectric withstand, preventing substation ground potential rise events — which can reach several kilovolts during fault conditions — from propagating into the relay’s logic circuitry. The isolation transformers are wound to maintain linearity within ±0.1% across the full dynamic range from 10% to 200% of nominal input, ensuring that both load-flow metering and fault current measurement remain accurate without range switching.

Anti-Aliasing Filter Design: Ahead of each ADC channel, a fourth-order Butterworth low-pass filter with a −3 dB corner frequency set at approximately 400 Hz suppresses harmonic content above the Nyquist boundary. This is particularly significant in systems with high-impedance grounding or capacitor bank switching, where voltage waveforms can contain significant 3rd and 5th harmonic content. Without adequate anti-aliasing, these harmonics fold back into the fundamental frequency band and corrupt phasor estimation algorithms.

EMC Shielding and Layout: The board uses a six-layer PCB stack-up with dedicated ground planes separating the analog front-end from the digital processing section. Ferrite beads are placed on all power supply rails entering the analog domain, and the board’s edge connector is routed through a common-mode choke array before reaching the relay backplane. This layout achieves compliance with IEC 61000-4-4 (electrical fast transient, 4 kV peak) and IEC 61000-4-5 (surge immunity, 2 kV line-to-line) without external filtering components.

Watchdog and Self-Supervision: An independent hardware watchdog timer monitors the board’s microcontroller execution cycle. If the firmware fails to service the watchdog within a configurable window (typically 100–500 ms), the watchdog asserts a hardware reset and simultaneously drives a supervision output to the relay’s binary output module, triggering an alarm in the SCADA system. This self-supervision mechanism is a mandatory requirement under IEC 60255-11 for protection relay hardware.

Thermal Management: Power dissipation on the board is managed through a combination of low-dropout linear regulators for the analog supply rails and synchronous DC-DC converters for the digital domain. The thermal design targets a maximum junction temperature of 85°C at a 55°C ambient, providing a 30°C margin that extends component MTBF beyond 100,000 hours under continuous operation.

System Integration Benefits

• Deterministic Operate Time: The board’s fixed-latency signal chain ensures that phasor data is delivered to the relay CPU within a bounded time window each sampling cycle, enabling the relay to achieve operate times compliant with IEC 60255-151 (typically <20 ms for instantaneous elements).
• Plug-and-Play Board Replacement: The 1MRK000195-AAr02 uses a standardized Eurocard connector and ABB’s relay-internal bus protocol, allowing board replacement without relay reconfiguration. Calibration constants are stored in non-volatile memory on the relay’s CPU board, not on this signal processing board, eliminating the need for field recalibration after swap.
• Dual-Function Metering and Protection: The 16-bit ADC resolution and precision isolation transformers allow the same board to serve both protection-grade accuracy (class P per IEC 60255-1) and revenue-metering-grade accuracy (class 0.5 per IEC 61869-2) simultaneously, reducing the need for separate metering transducers in many applications.
• IEC 61850 Data Model Compatibility: Sampled values and measured data produced by this board are formatted by the relay CPU into IEC 61850-9-2 Sampled Values (SV) streams, enabling direct integration with process-bus architectures and eliminating copper wiring between the relay and merging units in modern digital substations.
• Fault Record Capture: The board’s high sampling rate supports disturbance recording at up to 1 kHz, capturing pre-fault, fault, and post-fault waveforms with sufficient resolution to reconstruct fault inception angle, DC offset, and CT saturation behavior — data essential for post-event analysis and protection coordination review.
• Reduced Wiring Complexity: By consolidating current, voltage, and binary input conditioning onto a single board, the 1MRK000195-AAr02 reduces the terminal count and wiring complexity in the relay panel, lowering installation labor and the probability of wiring errors during commissioning.
• Diagnostic Transparency: The board continuously monitors its own supply voltages, reference voltages, and ADC offset drift. Out-of-tolerance conditions are reported via the relay’s internal diagnostic register, accessible through ABB’s PCM600 engineering tool, providing maintenance teams with early warning of hardware degradation before it affects protection performance.
• Long-Term Spare Parts Availability: As a board-level replacement unit, the 1MRK000195-AAr02 extends the operational life of installed REB/REL/REF relay fleets without requiring full relay replacement. This is particularly valuable for utilities managing aging substation assets where full relay replacement would require protection scheme re-engineering and re-testing.

Quality Assurance & Global Logistics

Every ABB 1MRK000195-AAr02 unit supplied by siemensplc.com is sourced through verified channels and subjected to a structured incoming inspection protocol before dispatch. Physical inspection covers PCB surface condition, component population completeness, connector pin integrity, and label authenticity cross-referenced against ABB’s published part number documentation. Where test equipment is available, boards are powered and checked for supply rail stability and communication bus activity prior to packaging.

Units are packed in anti-static shielding bags, placed in foam-lined rigid cartons, and labeled with part number, serial reference, and inspection date. Export documentation — including commercial invoice, packing list, and certificate of origin — is prepared for all international shipments to facilitate customs clearance in destination countries.

Dispatch is from Xiamen, China, with access to DHL Express, FedEx International Priority, and UPS Worldwide Expedited services. Typical transit times are 3–5 business days to Europe, 4–6 business days to the Americas, and 2–4 business days to Southeast Asia and the Middle East. For bulk procurement, sea freight consolidation is available with full export documentation support. All shipments are covered by a 12-month warranty against manufacturing defects from the date of dispatch.

Contact Information

Email: [email protected]
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Web: siemensplc.com
Location: Xiamen, China
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