SR489-P5-LO-A20-E 通用电气SR系列继电保护器

SR489-P5-LO-A20-E是通用电气（GE）SR系列中的一款发电机管理继电器，由GE Multilin生产，作为Multilin 489系列的一部分。该继电器专为发电机保护而设计，可用于感应或同步发电机，具有多种功能和特点。以下是对SR489-P5-LO-A20-E的详细解析：

一、产品概述

品牌与系列：通用电气（GE）SR系列，Multilin 489系列

型号：SR489-P5-LO-A20-E

用途：发电机管理继电器，用于发电机保护和控制

二、主要特点

显示屏与操作界面

设计有40个字符的显示屏，允许用户查看值消息、诊断和设定值。

前面板包括数字键盘、状态指示灯、值向上和向下键、RS232端口接口以及控制和编程键（如复位键、回车键、菜单键等），允许在不连接到外部计算机的情况下进行控制。

电气参数

可在25、50或60赫兹下运行。

继电器参数包括5A相位CT次级，LO控制功率为20-60 VDC，20-48 Hz时为48-62 VAC。

模拟输出为4至20 mA。

输入输出接口

后面板包括12个RTD输入、6个输出继电器、2个RS485通信端口和4个VT输入。

RTD可现场编程。

通信端口支持高达19200 bps的ModbusRTU或DNP 3.0协议（或两者兼而有之）。

还包括4个隔离的4-20 mA模拟输入和输出以及7个可分配的数字输入。

有七个CT输入，用于三相输出/三相中性线和接地电流检测，以及一个独立的安全和滤波器接地。

保护功能

能够监测发电机的各种运行参数，如电压、电流、频率和功率等。

当这些参数超出安全范围时，继电器会触发相应的保护动作，如断开电源或启动报警，以防止发电机受到损坏。

控制功能

除了保护功能外，该继电器还可以用于控制发电机的启动、停止和切换等操作。

它可以根据预设的逻辑或外部信号来控制发电机的运行状态，确保电力系统的稳定运行。

可编程性

用户可以根据具体的应用需求来设置继电器的参数和逻辑，使其能够适应不同的发电机系统和运行环境。

三、设计与安装

结构紧凑：体积小巧，易于安装和维护。

尺寸与重量：装运重量约为10千克，尺寸为21.6厘米（长）x 22.4厘米（宽）x 25.2厘米（高）。

高可靠性：经过严格的质量控制和测试，确保在恶劣的工业环境中也能稳定运行。

四、应用场景

SR489-P5-LO-A20-E发电机管理继电器适用于各种发电机管理和保护应用，特别是在需要高可靠性和精确控制的电力系统中。

 SR489-P5-LO-A20-E是一款功能强大、易于使用的发电机管理继电器，具有多种保护和控制功能，能够满足各种发电机管理和保护的需求。

SR489-P5-LO-A20-E is a generator management relay in the General Electric (GE) SR series, produced by GE Multilin as part of the Multilin 489 series. This relay is designed specifically for generator protection and can be used for induction or synchronous generators, with multiple functions and features. The following is a detailed analysis of SR489-P5-LO-A20-E:

1、 Product Overview

Brand and Series: General Electric (GE) SR Series, Multilin 489 Series

Model: SR489-P5-LO-A20-E

Purpose: Generator management relay, used for generator protection and control

2、 Main features

Display screen and operation interface

Design a 40 character display screen that allows users to view value messages, diagnostics, and set values.

The front panel includes a numeric keypad, status indicator lights, value up and down keys, RS232 port interface, and control and programming keys (such as reset key, enter key, menu key, etc.), allowing control without connecting to an external computer.

Electrical parameters

Can operate at 25, 50, or 60 hertz.

The relay parameters include 5A phase CT secondary, LO control power of 20-60 VDC, and 48-62 VAC at 20-48 Hz.

The analog output is 4 to 20 mA.

Input/output interface

The rear panel includes 12 RTD inputs, 6 output relays, 2 RS485 communication ports, and 4 VT inputs.

RTD can be programmed on-site.

The communication port supports Modbus RTU or DNP 3.0 protocol (or both) up to 19200 bps.

It also includes 4 isolated 4-20 mA analog inputs and outputs, as well as 7 assignable digital inputs.

There are seven CT inputs for three-phase output/three-phase neutral line and ground current detection, as well as an independent safety and filter ground.

Protection function

Capable of monitoring various operating parameters of the generator, such as voltage, current, frequency, and power.

When these parameters exceed the safe range, the relay will trigger corresponding protective actions, such as disconnecting the power supply or starting an alarm, to prevent damage to the generator.

control function 

In addition to its protective function, this relay can also be used to control the starting, stopping, and switching operations of the generator.

It can control the operation status of the generator based on preset logic or external signals, ensuring the stable operation of the power system.

Programmability

Users can set the parameters and logic of relays according to specific application requirements, enabling them to adapt to different generator systems and operating environments.

3、 Design and Installation

Compact structure: compact in size, easy to install and maintain.

Size and Weight: The shipping weight is approximately 10 kilograms, and the dimensions are 21.6 centimeters (length) x 22.4 centimeters (width) x 25.2 centimeters (height).

High reliability: Through strict quality control and testing, it ensures stable operation even in harsh industrial environments.

4、 Application scenarios

The SR489-P5-LO-A20-E generator management relay is suitable for various generator management and protection applications, especially in power systems that require high reliability and precise control.

In summary, SR489-P5-LO-A20-E is a powerful and easy-to-use generator management relay with multiple protection and control functions, capable of meeting various generator management and protection needs.