ALSTOM L54E2901TW00

Technical Specifications

• Main Supply Voltage: 110 / 220 V AC dual input power supply
• Auxiliary Logic Supply: 24 V DC ±5%
• Total Power Consumption: Max 32 W
• Operating Temperature Range: -20°C ~ +70°C
• Storage Temperature Range: -40°C ~ +85°C
• Humidity Tolerance: 5% ~ 90% RH non-condensing
• Vibration Resistance: 5–150Hz, 1.5g continuous vibration
• Communication Interface: VME backplane bus, RS485 field sensor bus
• Analog Input Channels: 12 CT/PT isolated measurement channels
• Digital I/O Channels: 16 binary status input, 8 regulation command output
• Galvanic Isolation Rating: 3000V AC between power grid measurement and logic circuit
• PCB Coating: Silicone conformal coating for power plant dust/humidity resistance

Function Features

1. Real-time synchronous sampling of generator three-phase voltage and current signals
2. Embedded excitation PID regulation algorithm for automatic generator terminal voltage stabilization
3. Overvoltage, undervoltage, overcurrent and loss-of-field fault protection logic integration
4. VME bus data exchange with main AVR CPU for system parameter configuration and fault recording
5. RS485 bus communication with turbine governor and plant DCS system for coordinated grid control

Performance Parameters

• Signal sampling synchronization accuracy: ≤0.1° phase angle error
• Voltage regulation control precision: ±0.5% rated generator terminal voltage
• Fault protection response time: ≤50 ms for severe grid abnormal conditions
• Data communication baud rate: 9600 / 19200 bps configurable RS485
• MTBF: 250,000 hours at nominal power plant operating temperature
• Analog measurement linearity error: ≤0.15% full scale

Material Composition

• PCB substrate: High-Tg FR4 flame retardant glass fiber board
• Surface protection: Silicone conformal anti-corrosion coating
• Isolation components: High voltage reinforced optocouplers
• Power conversion devices: Industrial-grade switching power ICs
• Bus connectors: Gold-plated VME edge connectors and RS485 terminal blocks
• Mechanical frame: Black coated cold rolled steel rack mounting bracket

Structural Characteristics

• Standard 6U VME single-width PCB form factor
• Dual power input terminal blocks for redundant AC power supply
• Front panel LED indicators for power status, communication link and fault alarms
• Separate analog measurement zone, digital control zone and power supply zone PCB layout
• Anti-vibration rubber cushion mounting lugs for power plant cabinet installation

Working Principle

Advantage Highlights

1. High voltage isolation eliminates grid surge damage to internal logic circuits
2. Integrated full-set generator excitation fault protection logic without auxiliary external modules
3. Silicone conformal coating resists power plant dust, humidity and corrosive flue gas
4. Dual redundant AC power supply input prevents single power source outage shutdown
5. Native compatibility with all Alstom large steam, gas and hydro generator AVR systems

Applicable Industries

Installation Requirements

1. Mount inside IP44 rated power plant control cabinet with dust filtering ventilation
2. Secure PCB rack mounting screws to 1.0 N·m torque to resist unit vibration
3. CT/PT signal wiring must use shielded twisted pair cable with single-point cabinet ground
4. Separate high-voltage measurement wiring from low-voltage logic signal wiring with minimum 30cm separation
5. Cabinet ambient temperature maintained below 60°C for continuous full-load operation

Usage Precautions

1. Cut off both AC main power and 24V DC auxiliary power before card removal or wiring modification
2. Calibrate CT/PT analog input channels every 24 months to maintain measurement accuracy
3. Avoid exposure to sulfur-containing corrosive gas in coal-fired power plant cabinets
4. Do not short-circuit CT secondary terminals during maintenance to prevent high voltage surge hazards
5. Store spare boards in constant temperature dry cabinet with anti-static packaging