Huawei DTSU666-H 100 A, DTSU666-H 250 A Manual

About This Document

Purpose
This document describes the DTSU666-H (100 A/40 mA) and DTSU666-H 250
A/50 mA Smart Power Sensor in terms of its functions, electrical properties, and structure. DTSU666-H (100 A/40 mA) is abbreviated as DTSU666-H.
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 defined 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.
	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.
NOTE	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 06 (2024-05-06)
Updated 2.2.2 Functions.

Issue 05 (2021-10-10)

• Updated2.3 Application Scenarios.
• Updated4.4 Structure Specifications.

Issue 04 (2021-03-01)
Updated 4.4 Structure Specifications.

Issue 03 (2019-12-10)

• Updated2.5 Product Structure.
• Updated4.4 Structure Specifications
• Added5 Current Transformer.

Issue 02 (2019-08-30)
Added the DTSU666-H 250 A/50 mA Smart Power Sensor.

Issue 01 (2018-03-01)
This issue is the first official release.

Overview

Product Overview

Type DTSU666-H and DTSU666-H 250 A/50 mA Smart Power Sensor (here in after referred to as the "sensor") adopts large-scaled integrated circuit with digital sampling technology, specially designed for power monitoring and energy metering demands including power system, communication industry, construction industry, mainly applied into real-time measurement and display for parameters such as three phase voltage, three phase current, active power, reactive power, frequency, positive and reverse energy, four quadrant electric energy, etc. Adopting the standard DIN35mm din rail mounting, structural module design, it is characterized with small volume, easy installation and networking, etc. As a monitoring terminal product towards energy management system, it can be widely applied into internal power assessment and monitoring of the industrial and mining enterprises, hotels, schools, large public buildings.
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

Figure 2-1 DTSU666-H or DTSU666-H 250 A/50 mA

Working Principles

Conceptual Diagram
The instrument is composed of highly accurate metering integrated circuit (ASIC), management MCU, storage chip, RS485 communication module, etc. The conceptual diagram is shown in Figure 2-2.
Figure 2-2 Conceptual diagram

2.2.2 Functions

• Display function:
  The displayed interfacial electrical parameter and power data are both primary-side data (which is calculated based on the value of the current and voltage). The energy measurement value is displayed in seven bits, with the display range from 0.00kWh to 999999.9 kWh.
  Figure 2-3 Liquid crystal display
  
  Table 2-1 Display (auto loop)

  No.	Display Interface	Instruction	No.	Display Interface	Instruction
  1		Positive active energy = 10000.0 kWh	2		Negative active energy = 2345.67 kWh
  3		Total phase active power = 3.291 kW	4		Phase A voltage = 220.0 V
  5		Phase B voltage = 220.1 V	6		Phase C voltage = 220.20 V
  7		Phase A current = 5.000 A	8		Phase B current = 5.001 A
  9		Phase C current = 5.002 A	10		Frequency freq = 50.00 Hz

  NOTE
  If no button is pressed for 60 seconds, the backlight turns off. Auto loop Switch time = 5s.
  Table 2-2 Display (change by key)

  No.	Display Interface	Instruction	No.	Display Interface	Instruction
  1		Comb.active energy = 7654.33 kWh	2		Positive active energy = 10000.0 kWh
  3		Negative active energy = 2345.67 kWh	4		None parity, 1 stop bit, baud = 9600 bps
  5		001 represents address	6		Phase A voltage = 220.0 V
  7		Phase B voltage = 220.1 V	8		Phase C voltage = 220.20 V
  9		Phase A current = 5.000 A	10		Phase B current = 5.001 A
  11		Phase C current = 5.002 A	12		Total phase active power = 3.291 kW
  13		Phase A active power = 1.090 kW	14		Phase Bactive power = 1.101 kW
  15		Phase C active power = 1.100 kW	16		Total phase power factor = 0.500 L
  17		Phase A power factor PFa = 1.000 L	18		Phase B power factor PFb = 0.500 L
  19		Phase C power factor PFc = 0.500 C	20		Frequency freq = 50.00 Hz

  NOTE
• Change by key "".
• Comb. active energy = Imp. active energy – Exp. active energy
• Programming function:
  Table 2-3 Programming function

  Parameter	Value Range	Description
  	1: 645 2: n.2 3: n.1 4: E.1 5: O.1	Settings for communication stop bit and parity bits: 1: factory mode 2: none parity, 2 stop bits, n.2 3: none parity, 1 stop bit, n.1 4: even parity, 1 stop bit, E.1 5: odd parity, 1 stop bit, O.1
  	0: 4.800 1: 9.600	Communication baud rate: 0: 4800 bps 1: 9600 bps
  	11-19	Communication address

• Programming operation:
  NOTE
  Communications parameters have been configured for the power meter before delivery. If the communication is abnormal, check and set the parameters.
  Button description: SET represents confirm or cursor shift (when entering digits), ESC represents exit, and → represents add. The password is 701 by default.
  Figure 2-4 Setting example for modifying communication address or baud rate
  When modify digits,""can be used as cursor shift button; " " is "add"button; " "represents exiting the setting interface or switch to the character interface from digit modification interface, restarting adding from zero after setting the digits to be the maximum value.
  
• Communication function
  The Sensor has an RS485 communication interface, the baud rate can be changed between 1200 bps, 2400 bps, 4800 bps and 9600 bps. The default Communication parameters is 9600 bps, none parity bits and 1 stop bit, and communication addresses (see factory numbers or LCD display), support ModBus RTU protocol.

Application Scenarios

Scenario 1: In the residential power station scenario (three-phase grid), sometimes according to the requirements of the grid, it is necessary to limit the active power of the grid-connected point. At this time, the smart power sensor needs to collect the power information of the grid-connected point to control the output power of the inverter. In the PV and storage scenario, the smart power sensor is required to control the battery charge and discharge. It adopts RS485 communication, which can realize the electrical quantity measurement and energy metering function, and respond to the upper host for the real-time data query.
Scenario 2: In commercial roof power plants, sometimes according to the requirements of the power grid, it is necessary to limit the active power of gridconnected points. At this time, the smart power sensor needs to collect the power information of the grid-connected point to control the output power of the inverter. It adopts RS485 communication, which can realize the electrical quantity measurement and energy metering function, and respond to the upper host for the real-time data query.
NOTE
The smart power sensor is mainly used for power control at the grid-connection point. The measured energy yield and electricity consumption are for reference only and cannot be used as a basis for calculating electricity fees. Electricity fee measurement is subject to the meter provided by the grid company.
Figure 2-5 Application Scenarios

Model Naming Conventions

Figure 2-6 Model naming conventions

Table 2-4 Model specification

NOTE
Please take the physical label as standard.

Product Structure

Table 2-5 Product Structure

Figure 2-7 Product dimensions (Smart Power Sensor)

Figure 2-8 100 A CT dimensions

Figure 2-9 250 A CT dimensions

Appearance
Differences between DTSU666-H and DTSU666-H 250 A/50 mA:

• Parameters on the panel
  Figure 2-10 DTSU666-H
  
  Figure 2-11 DTSU666-H 250 A/50 mA
  
• Nameplate
  Figure 2-12 DTSU666-H
  
  Figure 2-13 DTSU666-H 250 A/50 mA
  

Performance and Specifications
Table 2-6 Performance and specifications

Troubleshooting

Table 3-1 Common alarms and troubleshooting measures

NOTE
Contact the installation vendor if all failure analysis procedures listed above are completed and the fault still exists.

Technical Specifications

Environmental Specifications

Table 4-1 Environmental specifications

Main Technical Performance and Parameters

Electrical Parameters
Table 4-2 Electrical parameters

Percentage Error
Table 4-3 Limited value of active percentage error of the energy meter on balanced load

Table 4-4 Limited value of active percentage error of the energy meter on unbalanced load

Start
Under the power factor of 1.0 and 2‰ In, the instrument can be started with continuous metering (if it is multiple phase instrument, then it has balanced load). If the instrument is designed based on measurement for bi-directional energy, then it is suitable for each direction of energy.

Defluction
When applying voltage while the current circuit has no current, the test output of the instrument shall not produce a superfluous 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 :

For instrument of class 1:
From the formula: k represents energy meter constant (imp/kWh), m represents the testing component quantity, U_n represents the referenced voltage (V), I_max represents the large current (A).

Other Technical Parameters
Table 4-5 Other technical parameters

EMC Specifications

EMC performance of the meter conforms to the following relevant technical standard:

• IEC 61326-1:2012
• IEC 61326-2-1:2012
• EN 61326-1:2013
• EN 61326-2-1:2013
• EN 61000-3-2:2005/A2:2009
• EN 61000-3-3:2008

Structure Specifications

Table 4-6 Structure specifications

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 4-1 Install the smart power sensor

NOTE
A fuse and a thermistor are connected to each phase of Ua, Ub, and Uc inside the power meter to prevent damage caused by external short circuits. Ua, Ub, and Uc do not need to be protected by external fuses.

DTSU666-H or DTSU666-H 250 A/50 mA Wiring Terminal Instruction (Three-Phase Four-Wire)

NOTE

• The minimum cable diameter must comply with local cable standards.
• The factors that affect cable selection include the rated current, cable type, routing mode, ambient temperature, and maximum expected line loss.

Operating voltage: 0.7–1.3 Un

1. Three phase four wire: Connect the Ua, Ub, Uc, Un voltage lines to the 3, 6, 9 and 10 terminals of the collector. Connect current transformer outlets IA*, IA, IB*, IB, IC*, IC to terminals 13, 14, 16, 17, 19, 21 of the collector.
2. Connect RS485A and RS485B to the communication host.

NOTE

• In the SmartLogger networking, the RS485A and RS485B need to connect to the SmartLogger. In the Smart Dongle networking, the RS485A and RS485B need to connect to the inverter.
• The CT direction must be consistent with the arrow direction as shown in the preceding figure.

Figure 4-2 Three-phase four-wire (supported model: DTSU666-H or DTSU666-H 250 A/50 mA)

DTSU666-H 250 A/50 mA Wiring Terminal Instruction (Three-Phase Three- Wire)
Operating voltage: 0.7–1.3 Un

1. Three phase three wire: Connect the Ua, Uc, Ub voltage lines to the 3, 9 and 10 terminals of the collector. Connect current transformer outlets IA*, IA, IB*, IB, IC*, IC to terminals 13, 14, 16, 17, 19, 21 of the collector.
2. Connect RS485A and RS485B to the communication host.

NOTE

• In the SmartLogger networking, the RS485A and RS485B need to connect to the SmartLogger. In the Smart Dongle networking, the RS485A and RS485B need to connect to the inverter.
• The CT direction must be consistent with the arrow direction as shown in the preceding figure.

Figure 4-3 Three-phase three-wire (supported model: DTSU666-H 250 A/50 mA)

Current Transformer

Application
This product is suitable for 50 Hz multi-function electronic energy meter, anti-theft meter, digital display and other electrical measuring equipment.
This performance index of the current transformer conforms to the following relevant technical standard:

• JB/T 10665-2016
• JJG 313-2010

Environmental Specifications
Table 5-1 Environmental specifications

Electrical Parameters
Table 5-2 Electrical parameters

Electrical Circuit Diagram
Figure 5-1 Electrical Circuit Diagram

Product Size
The following figures show the CT structure of the DTSU666-H and DTSU666-H 250 A/50 mA meters.
Figure 5-2 CT structure of the DTSU666-H

Figure 5-3 CT structure of the DTSU666-H 250 A/50 mA

Acronyms and Abbreviations

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. The manufacturer 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.
• Follow specified 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.

Personnel Requirements
Only certified electricians are allowed to install, connect cables for, maintain, troubleshoot, and replace the DTSU666-H or DTSU666-H 250 A/50 mA.

• 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 specifications 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 the nameplate on the back of the DTSU666-H or DTSU666-H 250 A/50 mA because it contains important product information.

Installation

• Ensure that the DTSU666-H or DTSU666-H 250 A/50 mA is not connected to a power supply or powered on before finishing installation.
• To allow proper heat dissipation and installation, maintain appropriate clearances between the DTSU666-H or DTSU666-H 250 A/50 mA and other objects.

Electrical Connections

Before connecting cables, ensure that the DTSU666-H or DTSU666-H 250 A/50 mA is not damaged in any way. Otherwise, electric shocks or fire may occur.

• 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 specification requirements.

Operation

High voltage may cause an electric shock, which results in serious injury, death, or serious property damage from the DTSU666-H or DTSU666-H 250 A/50 mA in operation. Strictly comply with the safety precautions in this document and associated documents when operating the DTSU666-H or DTSU666-H 250 A/50 mA.

• Do not touch an energized DTSU666-H or DTSU666-H 250 A/50 mA because it may result in an electric shock.
• Follow local laws and regulations when operating the device.

Maintenance and Replacement

High voltage may cause an electric shock, which results in serious injury, death, or serious property damage from the DTSU666-H or DTSU666-H 250 A/50 mA in operation. Therefore, before maintenance, power off the DTSU666-H or DTSU666H 250 A/50 mA and strictly comply with the safety precautions in this document and associated documents to operate the DTSU666-H or DTSU666-H 250 A/50 mA.

• Maintain the DTSU666-H or DTSU666-H 250 A/50 mA with sufficient 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 DTSU666-H or DTSU666-H 250 A/50 mA can be powered on only after all faults are rectified. Failing to do so may escalate faults or damage the device.
• During the maintenance, observe ESD precautions and wear ESD gloves.