安科瑞DJSF1352-RN直流電能表在沙特光伏發(fā)電設施中的應用

安科瑞張俊杰

摘要：本文介紹了安科瑞DJSF1352-RN直流電表在沙特小型光伏發(fā)電設施直流側(cè)的應用。主要用于光伏系統(tǒng)中的電流的計量，通過分流器對電路系統(tǒng)進行計量、通訊和控制等。

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.項目概述：Project Overview

該公司位于沙特阿拉伯，公司主要在當?shù)?/span>從事小型光伏發(fā)電中心項目的安裝施工與維護等業(yè)務?？蛻粝胍褂?/span>直流電表，用于光伏系統(tǒng)中直流側(cè)電流電壓的監(jiān)測計量、通訊，要求電表具有兩路直流電能測量的功能。

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直流電表簡介 DJSF1352-RN/D DC Energy Meters

DJSF1352-RN導軌式直流電表帶有雙路直流輸入，主要針對電信基站、直流充電樁、太陽能光伏等應用場合而設計，該系列儀表可測量直流系統(tǒng)中的電壓、電流、功率以及正反向電能等。在實際使用現(xiàn)場，即可計量總電能，又可計量規(guī)定時間段內(nèi)的電能。檢測的結(jié)果既可用于本地顯示，又能與工控設備、計算機連接，組成測控系統(tǒng)。

儀表可具有紅外通訊接口和RS-485通訊接口，同時支持Modbus-RTU協(xié)議和DLT645-97(07)協(xié)議；可帶繼電器報警輸出和開關(guān)量輸入功能；根據(jù)不同要求，通過儀表面板按鍵，對變比、報警、通訊進行設置；具有開關(guān)量事件記錄（Modbus協(xié)議）、編程和事件設置記錄（645協(xié)議）、數(shù)據(jù)瞬時和定時凍結(jié)功能（645協(xié)議）、電壓電流功率大值、小值記錄功能。

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.型號及功能介紹 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.

Technical parameters			Index
Input	Nominal value		Voltage input range	Current input
			DC 0-1000V DC 0-1000V See the physical wiring diagram	Hall sensor：0-20mA、4-20mA、0-5V，0-10V and so on.

	Overload		1.2 times rated (continuous); 2 times rated/1 second;
	Power consumption		Voltage: ≤0.2VA, current ≤0.1VA
Accuracy class			Class 1
Function	Display		8-bit segment LCD screen (LCD)
	Communication Interface		RS485（two options）
	Communication protocol		Modbus-RTU，DL/T 645-2007
	Switch		Switch output		2 Relay outputs, 2A/30VDC or 2A/250VAC
			Switch input		2 dry contact inputs
	Pulse output		A second pulse output, a energy pulse output
			See the SYS->PLUS display in the meter menu settings. For example: The meter displays 100, which is 100imp/kWH
Power Supply	Voltage range		AC/DC 85-265V or DC24V(±10%) or DC48V(±10%)
	Power consumption		≤ 3W
Power frequency withstand voltage			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
Impulse withstand voltage			±6KV
Insulation resistance			≥ 40M ?
Average barrier-free working hours			≥50000h
Environment		Temperature	Normal operating temperature: -25 °C ~ +65 °C; Limit working temperature: -40 °C ~ +70 °C; Storage temperature: -40℃～+80℃
		Humidity	≤93%RH, no condensation, no corrosive gas
		Altitude	≤2500m

Pulse constant:

Maximum power	999.9W	10000	imp/kWh
	9.999kW	1000	imp/kWh
	99.99kW	100	imp/kWh
	999.9kW	10	imp/kWh
	9999kW	1	imp/kWh
Maximum power = rated voltage * voltage ratio * current ratio * 1.2