Time: 11 December 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 Nigeria. It is mainly used to measure
the DC current in the photovoltaic system, and cooperate with hall current
sensor to measure, communicate and control the circuit system.
1.Project Overview
The company is located in
Nigeria and is a new energy company. Mainly engaged in photovoltaic power
generation projects in Africa. The customer wants to use DC meters and hall
sensors for monitor current and voltage
at the DC side of photovoltaic system.
2. DJSF1352-RN DC Energy Meters
DJSF1352-RN
rail-mounted DC power meter 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), value recording function of
voltage and current power.
3.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 electric 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
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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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|
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Power
consumption
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Voltage: ≤0.2VA, current ≤0.1VA
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|
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Accuracy class
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Class 1
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|
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Function
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Display
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8-bit
segment LCD screen (LCD)
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|
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Communication
Interface
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RS485（two options）
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|
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Communication protocol
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Modbus-RTU，DL/T
645-2007
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|
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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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|
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Switch input
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2 dry contact inputs
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|
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Pulse output
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A second pulse output, a energy pulse output
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|
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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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|
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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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|
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Power consumption
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≤ 3W
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|
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Power frequency
withstand voltage
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Power supply // Voltage input // Current input // Relay output and
switch input // Communicationinterface/ / Pulse output 3kV/1min
Power supply // Relay output // Voltage input // Current input 3kV/1min
Pulse output // Communicationinterface// Switch input 2kV/1min
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|
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Impulse withstand
voltage
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±6KV
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|
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Insulation resistance
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≥ 40M Ω
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|
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Average barrier-free
working hours
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≥50000h
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|
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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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|
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Altitude
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≤2500m
|
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4.Split Core Hall
Current Transformer
Type | Rated current | Rated output | Measuring Aperture | Power Supply |
AHKC-EKA | 0-(50-500)A | 5V/4V | Φ20mm | ±15V |
AHKC-EKAA | DC 0-(50-500)A | 4-20mA | Φ20mm | 12V/24V |
AHKC-EKDA | AC 0-(50-500)A | 4-20mA | Φ20mm | 12V/24V |
AHKC-EKB | 0-(200-1000)A | 5V/4V | Φ40mm | ±15V |
AHKC-EKBA | DC 0-(200-1000)A | 4-20mA | Φ40mm | 12V/24V |
AHKC-EKBDA | AC 0-(200-1000)A | 4-20mA | Φ40mm | 12V/24V |
AHKC-EKC | 0-(500-1500)A | 5V/4V | Φ55mm | ±15V |
AHKC-EKCA | DC 0-(500-1500)A | 4-20mA | Φ55mm | 12V/24V |
AHKC-EKCDA | AC 0-(500-1500)A | 4-20mA | Φ55mm | 12V/24V |
AHKC-K | 0-(400-2000)A | 5V/4V | 64*16mm | ±15V |
AHKC-KAA | DC 0-(400-2000)A | 4-20mA | 64*16mm | 12V/24V |
AHKC-KDA | AC 0-(400-2000)A | 4-20mA | 64*16mm | 12V/24V |
AHKC-H | 0-(500-3000)A | 5V/4V | 82*32 | ±15V |
AHKC-KA | 0-(500-5000)A | 5V/4V | 104*36 | ±15V |
AHKC-HB | 0-(2000-8000)A | 5V/4V | 132*52 | ±15V |
0-(10000-20000)A | 5V/4V | 132*52 | ±15V |
0-(25000-40000)A | 5V/4V | 132*52 | ±15V |
AHKC-HBAA | DC0-(2000-8000)A | 4-20mA | 132*52 | 12V/24V |
DC0-(10000-20000)A | 4-20mA | 132*52 | 12V/24V |
DC0-(25000-40000)A | 4-20mA | 132*52 | 12V/24V |
AHKC-HBDA | AC0-(2000-8000)A | 4-20mA | 132*52 | 12V/24V |
AC0-(10000-20000)A | 4-20mA | 132*52 | 12V/24V |
AC0-(25000-40000)A | 4-20mA | 132*52 | 12V/24V |
5.Customer Requirement
The customer
have a solar hybrid system. PV panel, battery storage and diesel generator for
a telecom station，All the 3
systems are connected to a single bus bar. They wants to know the watt hour
reading from the bus bar using a DC meter. And their solar site is a telecom
site. the power supply voltage is DC 48V, the current is DC100A.
Bibliography
1.Solutions
For Enterprise Micro-grid System 2021.04
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