Time: 24 November 2021 |
Source: Acrel
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.Project Overview
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 DC Energy Meters
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.Type and Function Description
|
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 Ω
|
|
|
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
4.Requirements from Customer
4.1 The following are the customer's on-site solar panel parameters:
4.2 DC meter with two channels of direct current metering
The customer
requires a DC meter with two channels of direct current metering function, so
two current shunts are needed to work with the meter.
6.Installation Picture
Bibliography
1.Solutions
For Enterprise Micro-grid System 2021.04
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