ABB 3BHE026284R0102 UAD215 A102 Excitation Current Monitoring Panel

Overview

Key Features

• Six‑Channel Independent Sampling: Captures DC excitation current from each of the six rectifier arms in a six‑pulse bridge, with high accuracy of ≤0.2%FS and hardware RC filtering to suppress high‑frequency harmonics from thyristors.

• Local Visual Indication: Equipped with dedicated LEDs: STATUS (operation), ALARM (general fault), FAILED BRANCH (per‑arm fault), and OVERCURRENT (overload). Enables on‑site technicians to immediately identify open‑circuit thyristors, blown fuses, or overloaded branches without accessing the control room.

• High Isolation & Protection: Sampling circuits are galvanically isolated from the backplane power supply with ≥1200VAC isolation, protecting low‑voltage control circuits from high‑voltage transients. Built‑in reverse‑polarity and surge protection ensure robustness against power anomalies.

• Seamless System Integration: Connects to the power cabinet’s CIN trigger board via a backplane parallel bus, transmitting branch current data and fault codes to the main excitation COB board and DCS for remote monitoring and logging.

• Harsh Environment Resilience: PCB coated with conformal three‑proofing (moisture, salt spray, fungus), operating temperature from ‑20°C to +70°C (0–55°C typical in power cabinets), and humidity tolerance of 5%–95% RH non‑condensing, ideal for humid hydroelectric powerhouses.

Technical Specifications

• Manufacturer: ABB

• Model: 3BHE026284R0102 (UAD215 A102)

• Application: UNITROL 6000 Static Excitation System, PEC80 Industrial Control Platform

• Power Supply: DC24V ±10% (from power cabinet backplane bus), power consumption ≤3.2W

• Input Signals: 6‑channel 4–20mA DC from shunts (rectifier arm current)

• Measurement Accuracy: ≤0.2% full‑scale

• Isolation Voltage: ≥1200VAC (sampling to backplane)

• LED Indicators: STATUS, ALARM, 6× FAILED BRANCH, OVERCURRENT

• Operating Temperature: ‑20°C to +70°C (0–55°C normal operation)

• Storage Temperature: ‑40°C to +85°C

• Humidity: 5%–95% RH, non‑condensing

• Protection Class: IP20 (front panel, cabinet door mount)

• Dimensions (W×H×D): 112mm × 86mm × 32mm

• Weight: Approx. 275g

• Certifications: CE, compliant with IEC 60068 (vibration resistance: 10–500Hz)

Core Functions

Applications

• Power Generation Plants: Thermal, hydroelectric, and combined‑cycle facilities using ABB UNITROL 6000 excitation systems for synchronous generators.

• Heavy Industrial Drives: Large‑scale motor drives in steel, mining, and pulp/paper industries that employ high‑power rectifier units.

• Retrofit & Maintenance: Direct replacement for legacy UAD215 A102 panels in existing UNITROL 6000 installations, requiring no cabinet modifications or rewiring.

Compatibility

• Fully compatible with ABB UNITROL 6000 series static excitation systems and PEC80 control platforms.

• Interfaces with CIN trigger boards and COB main control boards in the power cabinet via standard backplane buses.

• Compatible with standard 4–20mA shunt signals used in ABB excitation systems, ensuring plug‑and‑play operation.

Advantages

• Enhanced Maintenance Efficiency: Local LED indication eliminates the need for constant remote monitoring and reduces troubleshooting time from hours to minutes.

• High Reliability in Harsh Conditions: Conformal coating, wide temperature range, and vibration resistance ensure stable operation in humid, dusty, and mechanically demanding environments.

• Precision & Safety: High‑accuracy current sampling and galvanic isolation protect both equipment and personnel, while overcurrent and fault protection mechanisms prevent catastrophic failures.

• Cost‑Effective Operation: By enabling early fault detection and reducing unplanned downtime, the panel lowers maintenance costs and improves the overall availability of power generation assets。