Huawei DDSU666-H User manual

DDSU666-H Smart Power Sensor
User Manual
Issue 02
Date 2021-03-01
HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2021. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior
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All other trademarks and trade names mentioned in this document are the property of their respective
holders.
Notice
The purchased products, services and features are stipulated by the contract made between Huawei and
the customer. All or part of the products, services and features described in this document may not be
within the purchase scope or the usage scope. Unless otherwise specied in the contract, all statements,
information, and recommendations in this document are provided "AS IS" without warranties, guarantees
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The information in this document is subject to change without notice. Every eort has been made in the
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Huawei Technologies Co., Ltd.
Address: Huawei Industrial Base
Bantian, Longgang
Shenzhen 518129
People's Republic of China
Website: https://e.huawei.com
Issue 02 (2021-03-01) Copyright © Huawei Technologies Co., Ltd. i

About This Document
Purpose
This document describes the DDSU666-H Smart Power Sensor in terms of its
functions, electrical properties, and structure.
Figures provided in this document are for reference only.
Intended Audience
This document is intended for:
● Sales engineers
● Technical support engineers
● Maintenance engineers
Symbol Conventions
The symbols that may be found in this document are dened as follows.
Symbol Description
Indicates a hazard with a high level of risk which,
if not avoided, will result in death or serious
injury.
Indicates a hazard with a medium level of risk
which, if not avoided, could result in death or
serious injury.
Indicates a hazard with a low level of risk which,
if not avoided, could result in minor or moderate
injury.
DDSU666-H Smart Power Sensor
User Manual About This Document
Issue 02 (2021-03-01) Copyright © Huawei Technologies Co., Ltd. ii

Symbol Description
Indicates a potentially hazardous situation which,
if not avoided, could result in equipment damage,
data loss, performance deterioration, or
unanticipated results.
NOTICE is used to address practices not related to
personal injury.
Supplements the important information in the
main text.
NOTE is used to address information not related
to personal injury, equipment damage, and
environment deterioration.
Change History
Changes between document issues are cumulative. The latest document issue
contains all updates made in previous issues.
Issue 02 (2021-03-01)
● Updated 2.6 Installing the DDSU666-H.
● Updated 2.7 Installing the DDSU666-H Cable.
Issue 01 (2018-03-01)
This issue is the rst ocial release.
DDSU666-H Smart Power Sensor
User Manual About This Document
Issue 02 (2021-03-01) Copyright © Huawei Technologies Co., Ltd. iii

Contents
About This Document................................................................................................................ ii
1 Safety Precautions...................................................................................................................1
2 Overview....................................................................................................................................4
2.1 Product Overview.................................................................................................................................................................... 4
2.2 Working Principles.................................................................................................................................................................. 5
2.3 Application Scenarios............................................................................................................................................................. 8
2.4 Model Naming Conventions................................................................................................................................................ 9
2.5 Product Structure.....................................................................................................................................................................9
2.6 Installing the DDSU666-H................................................................................................................................................. 10
2.7 Installing the DDSU666-H Cable..................................................................................................................................... 10
3 System Maintenance............................................................................................................ 12
3.1 Troubleshooting..................................................................................................................................................................... 12
4 Technical Specications....................................................................................................... 14
4.1 Environmental Specications............................................................................................................................................ 14
4.2 Main technical performance and parameter.............................................................................................................. 14
4.2.1 Electrical parameter..........................................................................................................................................................14
4.2.2 Percentage error................................................................................................................................................................ 15
4.2.3 Start........................................................................................................................................................................................15
4.2.4 Deuction............................................................................................................................................................................. 15
4.2.5 Other technical parameters........................................................................................................................................... 16
4.3 EMC Specications............................................................................................................................................................... 16
4.4 Structure Specications...................................................................................................................................................... 16
4.4.1 Structure specications....................................................................................................................................................16
5 Acronyms and Abbreviations B.......................................................................................... 17
DDSU666-H Smart Power Sensor
User Manual Contents
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1 Safety Precautions
General Safety
● Follow the precautions and special safety instructions provided by Huawei
when operating this product. Personnel who plan to install or maintain
Huawei devices must receive a thorough training, understand all necessary
safety precautions, and be able to correctly perform all operations. Huawei
will not be liable for any consequences that are caused by the violation of
general safety regulations and device usage safety standards.
● Before performing operations, read through this manual and follow all the
precautions to prevent accidents. The "DANGER", "WARNING", "CAUTION",
and "NOTICE" statements in this document do not represent all the safety
instructions. They are only supplements to the safety instructions.
● Operation personnel should comply with local laws and regulations. The
safety instructions in this document are only supplements to local laws and
regulations.
● Do not operate the product or handle cables during thunderstorms.
● Before operating the product, remove any conductors such as jewelry or
watches.
● Use insulated tools during operations.
● Bolts should be tightened with a torque wrench and marked using red or blue
color. Installation personnel should mark tightened bolts in blue. Quality
inspection personnel should conrm if the bolts are tightened and then mark
them in red. If screws or bolts used to secure the device are not tightened to
the required torque, the device may fall from the mounting bracket.
● Follow specied procedures during installation and maintenance. Do not
attempt to alter the device or deviate from the recommended installation
procedures without prior consent from the manufacturer.
● Install the product in strict accordance with the quick guide.
Disclaimer
Huawei shall not be liable for any consequence caused by any of the following
events:
● Transportation damage
DDSU666-H Smart Power Sensor
User Manual 1 Safety Precautions
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● The storage conditions do not meet the requirements specied in this
document.
● Incorrect installation or use
● Installation or use by unqualied personnel
● Failure to obey the operation instructions and safety precautions in this
document
● Operation in extreme environments which are not covered in this document
● The DDSU666-H operates beyond specied ranges.
● Unauthorized modications to the product or software code or removal of the
product
● Device damage due to force majeure (such as lightning, re, and storm)
● The warranty expires and the warranty service is not extended
● Installation or use in environments which are not specied in related
international standards
Personnel Requirements
Only certied electricians are allowed to install, connect cables for, maintain,
troubleshoot, and replace the DDSU666-H.
● Operation personnel should receive professional training.
● Operation personnel should read through this document and follow all the
precautions.
● Operation personnel should be familiar with the safety specications about
the electrical system.
● Operation personnel should understand the composition and working
principles of the grid-tied PV power system and local regulations.
● Operation personnel must wear proper personal protective equipment (PPE).
Protect Labels
● Do not scrawl or damage any warning labels on the DDSU666-H because
these labels contain important information about safe operation.
● Do not scrawl or damage the nameplate on the back of the DDSU666-H
because it contains important product information.
Installation
● Ensure that the DDSU666-H is not connected to a power supply or powered
on before nishing installation.
● To allow proper heat dissipation and installation, maintain appropriate
clearances between the DDSU666-H and other objects.
Electrical Connections
D ANGER
Before connecting cables, ensure that the DDSU666-H is not damaged in any way.
Otherwise, electric shocks or re may occur.
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● Ensure that all electrical connections comply with local electrical standards.
● Ensure that the cables used in a grid-tied PV system are properly connected
and insulated and meet all specication requirements.
Operation
D ANGER
High voltage may cause an electric shock, which results in serious injury, death, or
serious property damage from the DDSU666-H in operation. Strictly comply with
the safety precautions in this document and associated documents when
operating the DDSU666-H.
● Do not touch an energized DDSU666-H because it has a high temperature.
● Follow local laws and regulations when operating the device.
Maintenance and Replacement
D ANGER
High voltage may cause an electric shock, which results in serious injury, death, or
serious property damage from the DDSU666-H in operation. Therefore, before
maintenance, power o the DDSU666-H and strictly comply with the safety
precautions in this document and associated documents to operate the DDSU666-
H.
● Maintain the DDSU666-H with sucient knowledge of this document and
proper tools and testing devices.
● Temporary warning signs or fences must be placed to prevent unauthorized
people from entering the site.
● The DDSU666-H can be powered on only after all faults are rectied. Failing
to do so may escalate faults or damage the device.
● During the maintenance, observe ESD precautions and wear ESD gloves.
DDSU666-H Smart Power Sensor
User Manual 1 Safety Precautions
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2 Overview
2.1 Product Overview
Type DDSU666-H Smart Power Sensor (hereinafter referred to as the " Sensor ") is
specially designed for the distributed photovoltaic system, to be a new Smart
power sensor, combined with measurement and communication, mainly applied
into the measurement for electrical quantity including voltage, current,
power ,frequency, power factor, active energy etc. in the electrical circuit. It can
realize networking with the external device through RS485 communication
interface. Adopting the standard DIN35mm din rail mounting, structural module
design, it is characterized with small volume, easy installation and networking, etc.
This performance index of the meter conforms to the following relevant technical
standard:
● EN 61326-1:2013
● IEC 61326-1:2012
● EN 61326-2-1:2013
● IEC 61326-2-1:2012
● EN 61010-1:2010
● IEC 61010-1:2010
● EN 61010-2-1:2010
● IEC 61010-2-1:2010
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Figure 2-1 DDSU666-H
2.2 Working Principles
Conceptual Diagram
The Sensor can convert the voltage and current signal to be the signal that can be
identied by MCU through the sampling circuit, MCU will calculate and convert it
into energy, power, power factor and other electrical quantity by calculating the
signals in the sampling circuit, transferring to users through communication and
meanwhile save the data in the storage circuit. Please see the conceptual diagram
of the Sensor as gure 2-2:
Figure 2-2 2-2Conceptual diagram
Functions
● Metering function:
Accurately metering the positive/ reverse active energy and combined active
energy, no storage data loss for the sensor after power interruption.
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● Measurement function of electrical parameters
The sensor can accurately measure electrical parameters including power, voltage,
current, frequency, power factor, etc.
● Display function
The instrument adopts eld LCD design, characterized with display function
for electrical parameters and energy data. Please see LCD display in gure
2-3.
The display bit of energy measurement value can be six bits, with display
range from 0 to 999999kWh.
Figure 2-3 2-3Liquid crystal display
● Cyclic display
Characterized with cyclic display function, the shift time of cyclic display is 5s.
Please see the cyclic displayed item in table 2-1.
a. Cyclic displayed items
No. Content Description
1 Current positive active energy Imp = 1.20kWh
2 Current reverse active energy Exp = 1.00kWh
3 Active power P=1.100kW
4 Voltage U U=220.0V
5 Current I=5.000A
6 Frequency F=50.00Hz
● Button display
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The instrument has button display and backlight function, please see button
displayed items in table2-2.
a. 2-2Button displayed items
No. Content Description
1 Current combined active energy =0.20kWh
2 Current positive active energy Imp = 1.20kWh
3 Current reverse active energy Exp = 1.00kWh
4 n.1. data format to be eight bits,none parity bit
and one stop bit.
9600: baud rate to be 9600bps
4800: baud rate to be 4800bps
5 Comm.Add=11
6 Voltage U=220.0V
7 Current I=5.000A
8 Active power P=1.100kW
9 Power factor Ft=1.000
10 Frequency F=50.00Hz
Note: Backlight closed without button operation for sixty seconds.
Note: The combined active energy default by the factory is equal to positive active
energy.
● Parameter setting function
The sensor can set the communication address and baud rate through
buttons.
Setting method please see gure 2-4: Long press the button 3s, the sensor
will automatically enter into the communication address setting interface,
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with cyclic display for setting display interface of baud rate and
communication address. Please press the button when required for baud rate
or communication address settings, it will exit to communication address and
baud rate settings without button operation for twenty seconds.
The details are as follows:
Figure 2-4 Communication address and baud rate setting diagrammatic sketch
● Communication function
The sensor is equipped with one RS485 communication interface, with baud
rate changed among 4800bps and 9600bps. The default baud rate is 9600bps
with check bit and stop bit to be n.1, communication address (see factory
number or LCD display), support ModBus—RTU protocol.
2.3 Application Scenarios
Scenario 1: The sensor is used to realize power restriction of the power grid with
charge and discharge control towards energy storage in the household inverter
scheme, which is the core component for household energy management. It
adopts RS485 communication, which can realize the electrical quantity
measurement, energy metering function and in respond to the upper host for the
real-time data query.
Figure 2-5 Application Scenario
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2.4 Model Naming Conventions
Figure 2-6 Model naming conventions
1. Model Specication
Model No. Accuracy
grade
Referenced
voltage
Current
specication
Collector
constant
Type
DDSU666-H Active Class 1 230 V 100A/40mA 800imp/kWh Via
transformer
2.5 Product Structure
Outline dimension: 36mmx98mmx66mm; Din-rail mounting dimension: 35mm, for
the outline and installation dimension, please see Figure 2-7 as below:
Figure 2-7 Product dimensions
DDSU666-H Smart Power Sensor
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2.6 Installing the DDSU666-H
1. Install the smart power sensor on the standard din rail of DIN35mm.
2. Install the Smart Power Sensor to the standard din rail from the top to the
bottom, and then push the instrument to the din rail from the bottom to the
front part.
Figure 2-8 Install the smart power sensor
2.7 Installing the DDSU666-H Cable
Cable DDSU666-H Type Conductor
Cross-
sectional
Area Range
Outer
Diameter
Source
AC power
cable
L - 3 Two-core (L
and N)
outdoor
copper cable
4-6 mm210-21 mm Prepared by
the customer
N -4
CT cable I* - 5 - - - Manufact-urer
I - 6 - - -
Comm. cable RS485A - 24 Two-core
outdoor
shielded
twisted pair
0.25-1mm24-11 mm Manufact-urer
RS485B - 25
NO TE
● The minimum cable diameter must comply with local cable standards.
● The factors that aect cable selection include the rated current, cable type, routing
mode, ambient temperature, and maximum expected line loss.
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1. Connect the L,N voltage lines to the 3, 4 terminals of the collector.
2. Connect current transformer outlets I*, I to terminals 5, 6 of the collector.
3. Connect RS485A and RS485B to the communication host.
Figure 2-9 Installing the DTSU666-H Cable
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3 System Maintenance
3.1 Troubleshooting
Table 3-1 Common alarms and troubleshooting measures
Fault phenomenon Factor analysis Elimination method
No display after the
instrument being
powered on
1. Incorrect wiring mode;
2. Abnormal voltage supplied for
the instrument;
1. If the wiring mode is incorrect,
please connect based on the correct
wiring mode (see the wiring
diagram).
2. If the supplied voltage is
abnormal, please supply the
voltage on the instrument
specication.
Abnormal RS485
communication
1. The RS485 communication
cable is disconnected, short
circuit or reversely connected.
2. The address, baud rate, data
bit and parity bit of the
instrument is not in
accordance with the host
computer;
1. If any problems for the
communication cable, please
reconnect or change the cable.
2. Set the address, baud rate, data
bit, parity bit to be the same as the
host computer through buttons, for
button settings, please see
parameter setting.
Inaccurate for energy
metering
1. Incorrect wiring, please check
whether the corresponding phase
sequence of voltage and current
is correct.
2. Check whether the high & low
end of current transformer inlet is
reversely connected. Please
observe the power of Pa, Pb, Pc,
to be abnormal if any negative
values.
If the wiring mode is incorrect,
please connect based on the correct
wiring mode (see the wiring
diagram).
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NO TE
Contact the installation vendor if all failure analysis procedures listed above are completed
and the fault still exists.
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4 Technical Specications
4.1 Environmental Specications
Table 4-1 Environmental specications
Item Specications
Regulated working temperature range -25°C to +60°C
Limited working temperature range -35°C to +70°C
Relative humidity (Annual average) ≤75% RH
Atmospheric pressure 86–106kPa
4.2 Main technical performance and parameter
4.2.1 Electrical parameter
Table 4-2 Electrical parameter
Regulated working voltage range 176–288VAC
Extended working voltage range 0.7–1.3Un
Working frequency range 45–65Hz
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4.2.2 Percentage error
Table 4-3 The percentage error of the sensor cannot exceed the following corresponding limited
value
Current value Power
factor
The percentage error
limitation of various grade
instruments
Direct connect Via transformer Class 1
0.05 Ib ≤ I ＜0.1 Ib 0.02 In ≤ I ＜0.05 In1 ±1.5
0.1 Ib ≤ I ≤ Imax 0.05 In ≤ I ≤ Imax 1 ±1.0
0.1 Ib ≤ I ＜0.2 Ib 0.05 In ≤ I ＜0.1 In0.5 L ±1.5
0.8 C ±1.5
0.2 Ib ≤ I ≤ Imax 0.1 In ≤ I ≤ Imax 0.5 L ±1.0
0.8 C ±1.0
When users has special requirement 0.25 L ±3.5
0.2 Ib ≤ I ≤ Imax 0.1 In ≤ I ≤ Imax 0.5 C ±2.5
4.2.3 Start
Table 4-4 Under the referenced voltage and Table A-1, the sensor starts and continuously metering
the electrical energy
Sensor Energy meter grade Power factor
Class 1
Direct connect 0.004Ib1
Via transformer 0.002 Ib
4.2.4 Deuction
When applying voltage while the current circuit has no current, the test output of
the instrument shall not produce a superuous pulse. When testing, the current
circuit shall be disconnected and the applied voltage of the voltage circuit shall be
115% of the referenced voltage.
The shortest testing time :
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