描述
一、产品概述
MVAA14B1AA0785C是由ALSTOM（现为GE）开发的数字式发电机保护继电器，专为电力系统中的发电机保护设计，兼具低电压保护功能。其核心作用是监测电力参数、触发保护动作，并支持远程监控与通信，适用于发电厂、工业自备电站及新能源系统。
二、核心功能与特点
全面的发电机保护
定子保护：包括定子接地故障（64）、相间短路（87G）、过电压（59）、低电压（27）、过电流（51）、负序过电流（46）等。
转子保护：转子接地故障（64R）、失磁保护（40）、逆功率保护（32R）。
励磁控制：支持断路器控制与励磁系统联动。
灵活的配置与通信
可编程逻辑：用户可通过参数设置适配不同发电机类型和容量。
通信协议：支持Modbus RTU和IEC 60870-5-103，便于集成到自动化监控系统。
工业级可靠性
工作温度：-25°C至+70°C，适应恶劣环境。
防护设计：采用工业级元器件，MTBF（平均无故障时间）达40万小时。
冗余能力：支持双电源和通信接口冗余配置。
用户交互与维护
人机界面：LCD显示屏、LED指示灯及操作按键，支持状态监视与故障查询。
事件记录：存储历史故障事件，便于事故分析。
三、技术参数
参数类别规格
频率50/60 Hz
输入电压范围21-29 Vdc
通信接口多路可编程数字输入/输出，支持Modbus RTU和IEC 60870-5-103协议
安装方式面板安装或嵌入式安装
尺寸367×129×42.4 mm（参考通信电源模块尺寸，可能因型号变种调整）
四、典型应用场景
发电机组保护
水轮发电机组、燃气轮机发电机、柴油发电机组的电气故障防护。
新能源系统
风力发电机组、光伏发电站的低电压穿越保护与故障隔离。
工业自备电站
工厂应急电源的过载、短路保护，确保生产连续性。
电力系统集成
与PLC、DCS系统联动，实现发电厂自动化监控与保护。
1.Product Overview
The MVAA14B1AA0785C is a digital generator protection relay developed by ALSTOM(now GE).It is designed for generator protection in power systems and has low voltage protection functions.Its core function is to monitor power parameters,trigger protection actions,and support remote monitoring and communication.It is suitable for power plants,industrial self-provided power stations and new energy systems.
2.Core functions and features
Comprehensive generator protection
Stator protection:including stator grounding fault(64),phase-to-phase short circuit(87G),overvoltage(59),low voltage(27),overcurrent(51),negative sequence overcurrent(46),etc.
Rotor protection:Rotor grounding fault(64R),demagnetization protection(40),reverse power protection(32R).
Excitation control:supports the linkage between the circuit breaker control and the excitation system.
Flexible configuration and communication
Programmable logic:Users can adapt to different generator types and capacity through parameter settings.
Communication protocol:Supports Modbus RTU and IEC 60870-5-103 for easy integration into automated monitoring systems.
Industrial-grade reliability
Operating temperature:-25°C to+70°C,adapt to harsh environments.
Protection design:using industrial-grade components,MTBF(average failure-free time)reaches 400,000 hours.
Redundancy capability:Supports redundant configuration of dual power supply and communication interfaces.
User interaction and maintenance
Human-computer interface:LCD display,LED indicator lights and operation buttons,supporting status monitoring and fault query.
Event record:Store historical failure events for easy accident analysis.
3.Technical parameters
Parameter Category Specifications
Frequency 50/60 Hz
Input voltage range 21-29 Vdc
Communication interface Multi-channel programmable digital input/output,supporting Modbus RTU and IEC 60870-5-103 protocols
Installation method Panel installation or embedded installation
Dimension 367×129×42.4 mm(refer to the communication power module size,which may be adjusted due to model variant)
4.Typical application scenarios
Generator set protection
Electrical fault protection for water turbine generator sets,gas turbine generators,and diesel generator sets.
New energy system
Low voltage crossing protection and fault isolation of wind turbines and photovoltaic power stations.
Industrial self-provided power station
Overload and short circuit protection of factory emergency power supplies ensures production continuity.
Power system integration
Linked with PLC and DCS systems to realize automated monitoring and protection of power plants.
