ACREL DJSF1352-RN DC Energy Meter’s Application in Solar Hybrid System in Nigeria
ACREL DJSF1352-RN DC Energy Meter’s Application in Solar Hybrid System in Nigeria
ACREL DJSF1352-RN DC Energy Meter’s Application in Solar Hybrid System in Nigeria
Dec 8, 2021
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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), maximum and minimum 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.


Technical parameters

Index

Input

Nominal value

Voltage input range

Current input

DC 0-1000V

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 // Communicationinterface / / Pulse output 3kV/1min

Power supply // Relay output // Voltage input // Current input 3kV/1min

Pulse output // Communicationinterface // 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


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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