描述
GE SR489-P5-LO-A20-E是一款专为发电机保护与管理设计的智能继电器，属于Multilin 489系列，适用于工业、船舶、化工等领域的中低压发电系统。以下是其核心功能与技术参数解析：
一、电气参数
输入电流：支持5A相位CT二次侧输入，可兼容1A CT系统（需外部转换）。
控制电源：
-直流输入：20-60 VDC（宽范围设计）；
-交流输入：48-62 VAC（20-48 Hz），适应工业现场电源波动。
模拟输出：4-20 mA隔离输出，用于发电机状态远程监控（如电流、电压）。
二、显示与操作界面
显示屏：40字符LCD背光屏，支持实时数据显示（如电气参数、故障类型）、诊断信息及设定值查看。
前面板：
-数字键盘与输入按钮，便于参数设置与操作；
-多状态LED指示灯，快速识别设备状态；
-RS232接口，支持本地编程与调试。
三、通信与接口
通信协议：
-RS485端口：支持Modbus RTU、DNP 3.0协议，最高通信速率19200 bps；
-以太网接口（可选）：兼容Modbus TCP/IP、IEC 61850等协议，实现与SCADA系统无缝集成。
输入/输出接口：
-12个热电阻（RTD）输入，用于定子/轴承温度监测；
-4个隔离模拟输入（4-20 mA），支持振动等信号接入；
-6个输出继电器（10 A/30 VAC/DC），满足跳闸与报警需求。
四、保护功能
发电机专用保护：
-差动保护（比率制动式），快速识别内部短路；
-过载/过流保护（反时限曲线），防止电机损坏；
-电压/频率保护（过欠压、过欠频、不平衡），适应电网异常。
附加功能：
-失磁/逆功率保护，避免发电机反向运行；
-接地故障保护（高灵敏度，支持中性点接地系统）；
-热过载保护（结合RTD输入与热模型算法）。
GE SR489-P5-LO-A20-E is an intelligent relay designed for generator protection and management.It belongs to the Multilin 489 series and is suitable for medium and low voltage power generation systems in the fields of industry,shipbuilding,chemical industry,etc.The following is an analysis of its core functions and technical parameters:
I.Electrical parameters
Input current:supports 5A phase CT secondary side input,compatible with 1A CT system(external conversion required).
Control power supply:
-DC input:20-60 VDC(wide range design);
-AC input:48-62 VAC(20-48 Hz),adapting to power fluctuations in industrial sites.
Analog output:4-20 mA isolated output for remote monitoring of generator status(such as current,voltage).
II.Display and operation interface
Display:40-character LCD backlight screen,supporting real-time data display(such as electrical parameters,fault type),diagnostic information and set value viewing.
Front panel:
-Numeric keypad and input buttons for easy parameter setting and operation;
-Multi-state LED indicator for quick identification of device status;
-RS232 interface for local programming and debugging.
3.Communication and interface
Communication protocol:
-RS485 port:supports Modbus RTU and DNP 3.0 protocols,with a maximum communication rate of 19200 bps;
-Ethernet interface(optional):compatible with Modbus TCP/IP,IEC 61850 and other protocols,to achieve seamless integration with SCADA systems.
Input/output interface:
-12 thermal resistor(RTD)inputs for stator/bearing temperature monitoring;
-4 isolated analog inputs(4-20 mA),supporting vibration and other signal access;
-6 output relays(10 A/30 VAC/DC)to meet tripping and alarm requirements.
4.Protection function
Generator-specific protection:
-Differential protection(ratio braking type),quickly identify internal short circuit;
-Overload/overcurrent protection(inverse time curve),prevent motor damage;
-Voltage/frequency protection(over-undervoltage,over-underfrequency,unbalanced),adapt to grid abnormalities.
Additional functions:
-Demagnetization/reverse power protection,to prevent the generator from running in reverse;
-Ground fault protection(high sensitivity,support neutral point grounding system);
-Thermal overload protection(combined with RTD input and thermal model algorithm).
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