Description
The ABB 1MRK000508-BAR02 (commonly referenced as BAR02) is a Binary Input (BI) / Digital Input Module designed as an internal I/O board for ABB’s 670-series protection and bay control relays — including REB670 (Busbar), RET670 (Transformer), REG670 (Line), and RED670 (Distance). It acquires up to 16 dry-contact or externally sourced DC voltage contact signals (breaker auxiliary contacts, pressure switches, protection-trip/alarm dry contacts) and presents them to the relay’s main processing unit with time-stamping and spike filtering for accurate sequence-of-events (SOE) recording.
Application Scenarios
A 400 kV substation using ABB REB670 bus differential protection had its existing binary input board maxed out — all 16 channels occupied by breaker 52a/52b aux contacts, disconnect switch positions, and lockout-relay alarms. When a new breaker failure scheme required monitoring two additional protection-trip-assertion dry contacts, the protection engineer added a second ABB 1MRK000508-BAR02 (BAR02) board into the spare I/O slot of the REB670’s expansion rack. The new board was auto-detected by the relay firmware; the engineer mapped the two new contacts in PCM600, assigned SOE priority, and downloaded the configuration. During the subsequent staged test, the REB670 correctly captured the contact closure with <1 ms time-stamp resolution and logged it in the sequence-of-events buffer. The project lead remarked: “The 1MRK000508-BAR02 slotted straight in, was recognized instantly by the REB670, and gave us the extra points we needed without touching the original wiring. That kind of plug-and-play in a protection panel is rare — and very welcome.”
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1MRK000508-BAR02 (BAR02 Binary Input Module) |
| Manufacturer | ABB (Protection & Bay Control — 670 Series I/O Board) |
| Product Category | Binary / Digital Input Module (Internal Relay I/O Board) |
| Number of Inputs | 16 independent binary (digital) inputs |
| Input Type | Dry contact (w/ internal 24 V DC wetting) OR wet contact (externally sourced 24 / 48 / 110 / 220 V DC) |
| Input Threshold | OFF ≤ 30% of nominal voltage; ON ≥ 70% of nominal voltage (typical) |
| Spike / Debounce | Programmable filter 0–100 ms per group (default ~5 ms) |
| Time-Stamping | SOE resolution ≤ 1 ms (synchronized via IRIG-B / SNTP in host relay) |
| Isolation | ≥ 2 kV AC channel-to-logic & channel-group isolation |
| Indicators | 16 × input status LEDs (green ON = contact closed); Module RUN LED |
| Power Supply | Via 670-series I/O backplane (derived from relay 24 V DC system supply) |
| Operating Temp. | -20 °C to +55 °C (-4 °F to +131 °F); storage -40 °C to +85 °C |
| Mounting | Plugs into dedicated I/O slot of ABB 670-series relay / I/O expansion rack |
| Dimensions (approx.) | 160 × 100 × 25 mm (L × W × H), standard 670-series I/O card format |
| Configuration Tool | ABB PCM600 (parameterize filter time, SOE enable, voltage type, labeling) |
| Compliance | IEC 60255-21 (EMC), IEC 61850 compatible environment |
Technical Principles and Innovative Values
The ABB 1MRK000508-BAR02 (BAR02) is purpose-built for high-integrity substation binary signal acquisition:
- Innovation Point 1 — Millisecond-Precision SOE with Host Time Sync: Each input transition is captured with a time-stamp referenced to the host relay’s synchronized clock (IRIG-B / SNTP / PTP). This enables accurate root-cause analysis of cascading protection operations — a requirement for bus differential and breaker-failure schemes.
- Innovation Point 2 — Flexible Wetting / Dry-Contact Mode per Channel Group: The 1MRK000508-BAR02 can be configured to supply internal 24 V DC wetting current for passive (dry) contacts, or accept externally powered (wet) contacts up to 220 V DC. This avoids external auxiliary relays or separate DI cards when mixing old electromechanical aux contacts with modern electronic ones.
- Innovation Point 3 — Programmable Spike Suppression & Debounce: Electromechanical auxiliary contacts — especially 52a/52b on oil circuit breakers — exhibit contact bounce. The BAR02’s firmware-level debounce filter (configurable 0–100 ms per input group) rejects spurious transitions while preserving genuine fast-operations, preventing false SOE entries.
- Innovation Point 4 — Hot-Add Recognition & Auto-Enumeration: When inserted into a live 670-series I/O rack (with proper firmware), the 1MRK000508-BAR02 is detected by the CPU, its type reported in the relay’s hardware overview, and it becomes available for configuration without a rack power cycle — reducing panel-down time during mid-life expansions.
