Description

LWN2660-6 (3BHL000986P7002) Current Transformer Module

Technical Specifications

• Product Model: LWN2660-6 3BHL000986P7002
• Brand: ABB
• Warranty: One Year
• Input Voltage: Auxiliary supply 24 VDC
• Operating Temperature: -20°C to +70°C
• Storage Temperature: -40°C to +85°C
• Response Time: ≤ 2 μs current signal sampling response
• Protection Class: IP20 rack mounted
• Accuracy Class: 0.2S for metering and protection measurement
• Output Frequency: 50/60 Hz grid synchronous
• Rated Current Range: Primary rated 2600A, secondary 6A
• Communication Interface: Internal rack backplane bus
• Supported Protocols: ABB UNITROL excitation system proprietary bus
• Overload Capacity: 120% continuous overload, 20 times rated short-time withstand current
• Dimensions: 160 mm × 122 mm × 40 mm

Product Overview

The LWN2660-6 3BHL000986P7002 is a high-precision wound-type current transformer dedicated to ABB UNITROL generator excitation control systems, responsible for accurate real-time sampling of generator rotor excitation loop current. It converts large primary excitation current into standardized low-level secondary analog signals for the main control board to implement closed-loop excitation current regulation, overexcitation protection and thermal load monitoring. This component addresses measurement deviation issues caused by large excitation current in high-capacity generators, avoids protection misoperation triggered by distorted sampled waveforms, and provides reliable current data for generator load balance and grid parallel stability control. Power station excitation maintenance engineers, electrical protection technicians and DCS commissioning personnel benefit from its high accuracy class and strong short-circuit withstand capability under grid fault conditions. The module features robust insulation structure to resist voltage surges from thyristor rectifier circuits, delivers linear output across the full measuring range, and matches perfectly with UNITROL rack layout for compact installation inside excitation cabinets, effectively lowering long-term measurement drift and equipment unplanned shutdown risks.

Core Functional Features

1. 0.2S high accuracy measurement class, meeting both metering precision and relay protection strict requirements for generator excitation circuits
2. 2600A primary / 6A secondary transformation ratio customized for large synchronous generator rotor current detection
3. Excellent short-time thermal and dynamic stability to withstand massive inrush and fault currents during grid short-circuit events
4. High isolation insulation design blocks high voltage interference from power rectifier units and prevents control board damage
5. Standard plug-in structure compatible with UNITROL excitation system rack, consistent mechanical interface with other signal acquisition modules
6. Wide operating temperature tolerance adapts to temperature fluctuations in enclosed power plant control cabinets
7. Linear output characteristic ensures stable closed-loop regulation performance under light load to full load generator operating conditions