描述
一、核心功能
电机保护
过载保护：基于热应力计算的三相热过载保护，支持电机启动监控与速度开关闭锁功能。
过流保护：提供定时限或反时限的三相过流保护，包括速断保护（I>>）、延时速断保护（I>>）及低电流（失载）保护。
接地故障保护：非定向接地故障保护，支持定时限或反时限特性。
不平衡保护：基于负序电流的三相不平衡保护（反时限特性）及逆相序保护。
设备保护
电缆与变压器保护：适用于电力电缆出线及需要热过载保护的电力变压器，支持单相、两相或三相过流保护。
断路器保护：断路器故障保护、跳闸回路监控及跳闸计数器功能。
扩展功能
温度保护：支持PTC热敏电阻或RTD传感器输入，监测电机绕组或轴承温度。
紧急启动与累积启动时间计数器：防止频繁启动导致的设备损坏，支持禁止再启动功能。
二、硬件规格
输入与输出
电流输入：四个精确交流电流量输入通道，支持0…50倍额定电流测量。
数字输入/输出：
标配两个电隔离数字输入，可扩展至五个；
三个常开电源输出触点，两个转换信号输出触点（可扩展至五个）。
通信接口：
前面板支持无线或电缆通信；
后部可选配RS-485、塑料光纤或组合光纤模块，支持Modbus（RTU/ASCII）、IEC 60870-5-103、SPA总线协议。
人机界面
显示：2×16字符LCD，支持一次电流值、需求值及事件代码显示。
操作：导航按钮与密码保护功能，支持多国语言切换。
指示灯：八个可编程LED，实时显示运行状态（绿色）、告警（黄色）及跳闸（红色）。
1.Core functions
Motor protection
Overload protection:Three-phase thermal overload protection based on thermal stress calculation,supports motor start monitoring and speed switch-off lock functions.
Overcurrent protection:Provides three-phase overcurrent protection with a fixed or reverse time limit,including fast break protection(I>>),delayed speed break protection(I>>)and low current(lost load)protection.
Ground fault protection:Non-directional ground fault protection,supports time limit or reverse time limit characteristics.
Imbalance protection:Three-phase imbalance protection(inverse time characteristics)and inverse phase sequence protection based on negative sequence current.
Equipment protection
Cable and transformer protection:suitable for power cable outlets and power transformers that require thermal overload protection,supporting single-phase,two-phase or three-phase overcurrent protection.
Circuit breaker protection:circuit breaker fault protection,trip circuit monitoring and trip counter function.
Extended features
Temperature protection:Supports PTC thermistor or RTD sensor input to monitor the motor winding or bearing temperature.
Emergency Start and Cumulative Start Time Counter:Prevent equipment damage caused by frequent startup,and supports the prohibition of re-start function.
2.Hardware specifications
Input and Output
Current input:Four accurate AC current input channels,supporting 0…50 times rated current measurement.
Digital input/output:
Two electrically isolated digital inputs are standard,which can be expanded to five;
Three normally open power output contacts,two conversion signal output contacts(expandable to five).
Communication interface:
The front panel supports wireless or cable communication;
The rear can be equipped with RS-485,plastic fiber or combined fiber modules,supporting Modbus(RTU/ASCII),IEC 60870-5-103,and SPA bus protocols.
Human-computer interface
Display:2×16 character LCD,supporting display of primary current value,demand value and event code.
Operation:Navigation button and password protection function,support multi-language switching.
Indicator lights:Eight programmable LEDs,displaying the operating status(green),alarm(yellow)and tripping(red)in real time.
