1 概述 Overview
ALP220-PT 系列智能型低压PT保护（以下简称 ALP220-PT），适用于额定电压为 400V、额定频率为 50Hz
的低压系统。产品具备完善的保护、测量、控制与监视功能，为低压系统的保护与控制提供了完整的解决方
案，同时还具有体积小，结构紧凑，安装方便等优势。
ALP220-PT series intelligent low-voltage PT protector apply to low-voltage system with rated voltage to AC
400V and rated frequency of 50Hz. ALP220-PT intelligent low-voltage PT protector, due to perfect protection, measurement, control and monitoring functions, not only provides a complete solution for low voltage system
protection and control, but also has the advantages of small size, compact structure and easy installation. ALP220-PT 系列产品集保护、测量、总线通讯为一体，提供面板指示、信号报警、故障/报警记录及开关
量记录等功能。可以广泛使用于煤矿、石化、冶炼、电力、船舶、以及民用建筑等领域。
ALP220-PT series products have integrated protection, measurement, control and modbus communication into
one and provided panel indication, signal alarm, trip alarm record and switch quantity record and other functions, applying to coal mine, petrifaction, smelting, electricity, ship and civil architecture and other fields. ALP220-PT 系列产品具有以下特点：
ALP220-PT series products have the following characteristics:
■ 辅助电源支持 AC 85V～265V/DC 110V～350V。
■ The auxiliary power supply (APS) supports AC 85V～265V/DC 110V～350. ■ 测量功能包括保护回路的电压测量和其他参数如接地电压的测量。
■ The measurement function includes the voltage measurement of protection circuit and the measurement of
other parameters such as grounding voltage. ■ 具有低电压三段式保护、过电压保护、零序过电压保护、电压不平衡保护、PT 断线保护、小车位置
保护、联动保护等功能。
■ It has low voltage three-stage protection, overvoltage protection, zero-sequence overvoltage
protection, voltage imbalance protection, PT disconnection protection, trolley position
protection and other functions. ■ 具有 5 路 DI 无源干接点输入，信号电源采用内置 DC24V 电源，另外可选配湿接点开关量输入。
■ 5-circuit DI passive dry contact input and signal power adopts built-in DC24V power supply.Optional wet
contact switching value input is also available. ■ 具有 4 路 DO 输出，可用于保护控制。
■ 4-circuit DO output is used to protection and control . ■ 具有 2 路标准的 RS-485 通讯接口，采用 Modbus-RTU，保证了上位机通讯的快速可靠。
■ It has 2-circuit standard RS-485 communication interface and ModbusRTU is adopted, which has
guaranteed the rapid and reliable upper computer communication. ■ 具有 1 路 DC 4-20mA 模拟量输出接口，可设定多项模拟量参数。
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■ It has 1-circuit DC4-20mA analog output interface and can set several analog parameters. ■ 具有系统时钟和 8 次故障/报警记录功能，系统时钟记录当前时间（日、时、分、秒），故障记录功
能记录故障原因。
■ It has system clock and can record 8 failures. The system clock will record the current time (day, hour, minute, second) and the failure record function will record the failure cause. ■ 具有 8 次 DI 动作记录功能，记录 DI 动作时间及状态。
■ It has 8 times of DI operation recording functions to record the DI operation time and status. ■ 采用全中文液晶显示界面。
■ All-Chinese LCD interface is adopted
2 型号说明 Model description
表 1 ALP220-PT 型号说明表
4 外形及安装尺寸 Appearance and installation dimension
ALP220-PT低压PT保护 外形尺寸及安装开孔尺寸如图 1 所示，ALP220-PT 采用嵌入式安装，按照开孔尺寸在柜体表面
开好安装孔，通过锁紧件固定在柜体表面上。（单位：mm）
ALP220-PT appearance and installation hole opening dimension are shown in Figure 1.ALP220-PT shall adopt
embedded installation: open the mounting hole on the cabinet surface according to hole size and fix on cabinet
surface through retaining member.(Unit: mm)
5 订货范例 Ordering examples
例：型号：ALP220-PT-K1/M
For example:Model：ALP220-PT-K1/M
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辅助电源：AC220V
Auxiliary power supply：AC220V
应用场合：低压 PT 柜
Application: Low voltage PT cabinet
测量参数：三相电压、接地电压
Measurement parameters: three-phase voltage, ground voltage
附加功能：模拟量输出
Additional functions：Analog output
