摘要：本文介绍了安科瑞DJSF1352-RN直流电表在沙特小型光伏发电设施直流侧的应用。主要用于光伏系统中的电流的计量，通过分流器对电路系统进行计量、通讯和控制等。
Abstract: This paper introduces the application of Acrel DJSF1352-RN DC energy meter in the DC side of a photovoltaic system in Saudi Arabia. It is mainly used to measure the DC current in the photovoltaic system, and cooperate with current shunts to measure, communicate and control the circuit system.
1.项目概述：Project Overview
该公司位于沙特阿拉伯，公司主要在当地从事小型光伏发电中心项目的安装施工与维护等业务。客户想要使用直流电表，用于光伏系统中直流侧电流电压的监测计量、通讯，要求电表具有两路直流电能测量的功能。
The company is located in Saudi Arabia. The company is mainly engaged in installation, construction and maintenance of small photovoltaic power generation center projects in Bulgaria and surrounding countries. The customer wants to use DC meters and hall sensors or current shunts for monitoring, metering and communication of current and voltage at the DC side of photovoltaic system, and demands that the DC energy meter would be able to measure two channels of DC circuits.
2.DJSF1352-RN/D直流电表简介 DJSF1352-RN/D DC Energy Meters
DJSF1352-RN导轨式直流电表带有双路直流输入，主要针对电信基站、直流充电桩、太阳能光伏等应用场合而设计，该系列仪表可测量直流系统中的电压、电流、功率以及正反向电能等。在实际使用现场，即可计量总电能，又可计量规定时间段内的电能。检测的结果既可用于本地显示，又能与工控设备、计算机连接，组成测控系统。
仪表可具有红外通讯接口和RS-485通讯接口，同时支持Modbus-RTU协议和DLT645-97(07)协议；可带继电器报警输出和开关量输入功能；根据不同要求，通过仪表面板按键，对变比、报警、通讯进行设置；具有开关量事件记录（Modbus协议）、编程和事件设置记录（645协议）、数据瞬时和定时冻结功能（645协议）、电压电流功率大值、小值记录功能。
DJSF1352-RN rail-mounted DC power meter with double DC input channels, designed for telecommunications base stations, DC charging piles, solar photovoltaic and other applications, this series of meters can measure the voltage, current, power and forward and reverse energy and so on in the DC system.The actual use of the site, you can measure the total power, but also measure the energy within a specified period of time. The test results can be used for local display, but also with industrial control equipment, computers to form a measurement and control system.
The meter can have infrared communication interface and RS-485 communication interface, and supports Modbus-RTU protocol and DLT645-97 (07) protocol at the same time.The meter can have relay alarm output and digital input function;You can set the ratio, alarm, and communication through the meter panel keys according to different requirements.The meter can have event recording of switch (Modbus protocol), programming and event setting records (645 protocol), instantaneous and timing freeze function of data (645 protocol), maximum and minimum value recording function of voltage and current power.
3.型号及功能介绍 Type and Function Description
Note：when dual DC input（D）function is selected，if Hall current sensor input is used in
current channel,a power supply module shall be provided to supply power to the second Hall sensor;if D function is not provided,the built-in power supply of elecctric meter can be used.
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Technical parameters
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Index
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Input
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Nominal value
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Voltage input range
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Current input
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DC 0-1000V
DC 0-1000V
See the physical wiring diagram
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Hall sensor：0-20mA、4-20mA、0-5V，0-10V and so on.
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Overload
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1.2 times rated (continuous); 2 times rated/1 second;
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Power consumption
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Voltage: ≤0.2VA, current ≤0.1VA
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Accuracy class
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Class 1
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Function
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Display
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8-bit segment LCD screen (LCD)
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Communication Interface
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RS485（two options）
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Communication protocol
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Modbus-RTU，DL/T 645-2007
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Switch
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Switch output
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2 Relay outputs, 2A/30VDC or 2A/250VAC
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Switch input
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2 dry contact inputs
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Pulse output
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A second pulse output, a energy pulse output
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See the SYS->PLUS display in the meter menu settings. For example: The meter displays 100, which is 100imp/kWH
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Power Supply
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Voltage range
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AC/DC 85-265V or DC24V(±10%) or DC48V(±10%)
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Power consumption
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≤ 3W
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Power frequency withstand voltage
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Power supply // Voltage input // Current input // Relay output and switch input // Communication interface / / Pulse output 3kV/1min
Power supply // Relay output // Voltage input // Current input 3kV/1min
Pulse output // Communication interface // Switch input 2kV/1min
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Impulse withstand voltage
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±6KV
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Insulation resistance
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≥ 40M Ω
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Average barrier-free working hours
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≥50000h
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Environment
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Temperature
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Normal operating temperature: -25 °C ~ +65 °C; Limit working temperature: -40 °C ~ +70 °C;
Storage temperature: -40℃～+80℃
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Humidity
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≤93%RH, no condensation, no corrosive gas
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Altitude
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≤2500m
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Pulse constant:
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Maximum power
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999.9W
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10000
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imp/kWh
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9.999kW
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1000
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imp/kWh
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99.99kW
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100
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imp/kWh
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999.9kW
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10
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imp/kWh
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9999kW
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1
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imp/kWh
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Maximum power = rated voltage * voltage ratio * current ratio * 1.2
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4.客户特殊需求Requirements from Customer
4.1 以下是客户现场太阳能电板参数：
The following are the customer's on-site solar panel parameters:
