Application of power monitoring system in the commercial center plot of the urban complex in the transportation hub of Renmin South Road, Kunshan City-Ankerui Cui Tingyu

Ankerui Cui Tingyu

Jiangsu Ankerui Electric Manufacturing Co., Ltd.

Abstract: Introduce the commercial center plot of the urban complex in the transportation hub of Renmin South Road in Kunshan City. It uses comprehensive protection devices, multi-function meters, transformer temperature controllers, and DC screens to collect various electrical parameters and status signals at the distribution site. The system adopts the method of on-site networking. After networking, it communicates through fieldbus and transmits it to the background. Real-time monitoring and management of the power consumption of the substation's power distribution loop is realized through the Ankerui power monitoring system.

Keywords: Kunshan Renmin South Road Transportation Hub Urban Complex Commercial Center Land; 10KV Substation and Distribution Station; Comprehensive Protection Device; Acrel-2000; Power Monitoring System.

0 overview

The project is the first urban complex project in Kunshan City, with a land area of ​​51775 square meters, a total construction area of ​​155,325 square meters above ground, and a total construction area of ​​221,325 square meters.

The project has a total of two 10kV incoming lines and ten 10kV outgoing circuits; 10kV/0.4kV power distribution rooms are set up in total, T1, T2 transformers are installed in 1# substation and distribution room, T3, T4 transformers are installed in 2# substation In the power room, T5 and T6 transformers are installed in the 3# substation and distribution room, T7 and T8 transformers are installed in the 4# substation and distribution room, and T9 and T10 transformers are installed in the refrigerator room. 10kV and 0.4kV substation comprehensive protection, multi-function instruments, temperature controllers, DC screens and other equipment are connected to the power monitoring system using RS485 bus networking, and the system host is installed in the 10kV substation duty room.

1 Technical standards

The countries and industries cited in this technical specification are marked as follows:

ISO/IEC11801 "International Integrated Wiring Standard"

GB/50198 "Technical Specification for Monitoring System Engineering"

GB50052 "Code for Design of Power Supply and Distribution System"

GB50054 "Code for Low Voltage Power Distribution Design"

IEC 61587 "Electronic Equipment Mechanical Structure Series"

GB14285 "Technical Regulations for Relay Protection and Safety Automatic Devices"

GB/3047.1 "Basic dimension series of panels, racks and cabinets"

GB/T17626.2 "Electromagnetic compatibility test and measurement technology electrostatic discharge immunity test"

DL/T720 "General technical requirements for power system relay protection cabinets and screens"

DL/T 698.1-2009 "Part 1: General Provisions"

DL/T 698.2-2010 "Part 2: Technical Specifications of the Master Station"

DL/T 698.31-2010 "Part 3.1: Technical Specifications for Electric Energy Information Collection Terminals-General Requirements"

DL/T 698.35-2010 "Part 3-5: Technical Specifications for Electric Energy Information Collection Terminals-Special Requirements for Low-voltage Centralized Meter Reading Terminals"

DL/T 698.41-2010 "Part 4-1: Communication Protocol-Communication between Master Station and Electric Energy Information Collection Terminal"

DL/T 698.42-2010 "Part 4-2: Communication Protocol-Concentrator Downlink Communication Protocol"

DL/T 698.41-2010 "Part 4-1: Communication Protocol-Communication between Master Station and Electric Energy Information Collection Terminal"

DL/T 698.42-2010 "Part 4-2: Communication Protocol-Concentrator Downlink Communication Protocol"

2 System solution

The monitoring system mainly realizes the monitoring and management of the electricity safety of the power transformation and distribution of the commercial center plot of the urban complex on Renmin South Road, Kunshan City. The monitoring range is 10KV commercial opening and closing station: 12 ACR220ELH instruments, 1 DC screen; 10KV commercial station 1: 2 ACR220ELH instruments, 2 transformer temperature controllers, 82 PZ80L-E4/KC instruments, ACR230ELH/K instruments 2 pieces, 1 DC screen; 10KV commercial station 2: 2 ACR220ELH instruments, 2 transformer temperature controllers, 66 PZ80L-E4/KC instruments, 2 ACR230ELH/K instruments, 1 DC screen; 10KV commercial 3 Station: 2 ACR220ELH meters, 2 transformer temperature controllers, 84 PZ80L-E4/KC meters, 2 ACR230ELH/K meters, 1 DC screen; 10KV commercial station 4: 2 transformer temperature controllers, PZ80L -74 E4/KC instruments, 2 ACR230ELH/K instruments; 10KV commercial refrigeration station: 2 ACR220ELH instruments, 2 transformer temperature controllers, 44 PZ80L-E4/KC instruments, 2 ACR230ELH/K instruments, DC screen 1 set. Comprehensive protection devices, transformer temperature controllers, multi-function meters, and DC screens are connected to the data collector in the substation through the 485 bus, and then the data is uploaded to the substation duty room host through the optical fiber and network cable, so as to realize the bus on the monitoring host Data connection between the upper instrument and the monitoring host. As shown in the figure below: station control management layer, network communication layer and field device layer.

System network topology diagram

1) Station control management

The station control management layer is the direct window of human-computer interaction for the management personnel of the power monitoring system. It mainly refers to industrial computers, monitors, UPS, etc. placed in the duty room.

2) Network communication layer

The communication layer is mainly composed of collectors and bus networks. The main function of the collector is to monitor on-site intelligent instruments, comprehensive protection devices, transformer temperature controllers, and DC screens; the main function of the bus network is to realize data interaction, so that the management of the distribution system is centralized, informatized, and intelligent, which greatly improves The safety, reliability and stability of the power distribution system have truly achieved the goal of unattended operation.

3) Field equipment layer

The field equipment layer is a data acquisition terminal, which is mainly composed of a transformer temperature controller, a comprehensive protection device, a multi-function instrument, and a DC screen. It is connected to the communication server through a shielded twisted pair RS485 interface and a MODBUS communication protocol bus connection. Reach the monitoring host of the power distribution room for networking and realize remote monitoring.

Smart instrument connection diagram

Field instruments are connected hand in hand via shielded twisted pair (RVVSP2*1.0). Each bus is connected to about 25 smart instruments, and then upload the data to the serial server, and then upload the data to the local monitoring terminal. The specific connection diagram is as follows:

3 System function

Features

The system adopts a full Chinese interface, which is simple and convenient to operate; stable and reliable operation; the system has a system diagram display, a simulation diagram display and a network structure diagram display; the system provides a friendly human-computer interaction interface, and all operations can be performed on the interface. And has a remote display function.

login interface

In order to ensure the safe and stable operation of the system, the Acrel-2000 power monitoring system is equipped with a user authority management function. User authority management can prevent unauthorized operations (such as the modification of the name of the distribution circuit, etc.). The login name, password and operation authority of users of different levels can be defined to provide reliable security guarantee for system operation, maintenance and management.

Main function: The user's level is divided into four levels: operator, monitor, engineer, and system administrator. Each level can be assigned different operation permissions, including entering operation, exiting operation, remote operation, report management, system configuration, User management, etc. The system administrator is the highest level user, and the higher level users can add or delete the next level users.

Power distribution monitoring interface

Acrel-2000 power monitoring system has a friendly human-machine interface. It can visually display the operating status of distribution lines in the form of a distribution diagram, and monitor the voltage, current, power, power factor, energy and other electrical parameters of each circuit in real time. Dynamically monitor the closing and opening status of circuit breakers, isolating switches, ground cutters, etc., as well as related faults, alarms and other signals.

Main functions: A diagram shows the name, current, voltage, total active power, total power factor, closing and opening states of circuit breakers, ground cutters, and isolating switches, spring energy storage state, and handcart position state of each circuit.

Power distribution monitoring selection interface

1#Substation interface

1#Detailed parameters of substation incoming line harmonic meter

Detailed electrical parameter query

In the distribution diagram, click with the mouse to view the detailed electrical parameters of the circuit, including three-phase current, three-phase voltage, three-phase total active power, total reactive power, total power factor, and forward active energy, and you can view them 24-hour phase current trend curve and 7-day phase current trend curve.

Distribution circuit details

Communication status

Acrel-2000 power monitoring system supports real-time monitoring of the communication status of each device connected to the system, and can completely display the entire system network structure; it can diagnose the communication status of the device online, and automatically display the faulty device on the interface when a network abnormality occurs Or components and faulty parts. It is convenient for operation and maintenance personnel to grasp the communication status of each equipment on site in real time, maintain abnormal equipment in time, and ensure the stable operation of the system.

Main functions: It has a complete system communication topology diagram, real-time display of equipment communication status, red status indicates normal communication of the corresponding equipment, and green status indicates abnormal communication of the equipment. Beside the system host and serial server/communication management machine, the assigned IP address of the device is marked, and the device address and device loop number are marked next to each device.

Communication status diagram

Electric parameter report

Acrel-2000 power monitoring system has storage and management functions for real-time power parameters and historical power parameters. All real-time collected data and sequential event records can be saved to the database. The parameters that need to be queried can be customized in the query interface , Specify the time or select to query the most recently updated record data, etc., and display it in a report form.

Main function: Query the operating parameters of each circuit or equipment at a specified time. The electrical parameter information displayed in the report should include: each phase current, three-phase voltage, total power factor, total active power, total reactive power, forward active energy, etc. The electrical parameter report also supports the export of Excel format files, and can also export PDF format files according to user requirements.

Energy report

Acrel-2000 power monitoring system supports the integrity of the system with a rich report body. The system has the function of regular meter reading and summary statistics. Users can freely query the power consumption of each distribution node in any period of time since the normal operation of the system, that is, the statistical analysis report of the power consumption of the node's incoming line and the power consumption of each branch circuit. This function makes electricity consumption visible and transparent, and can be analyzed and traced when the electricity consumption error is too large to maintain the correctness of the measurement system.

Main function: Time selection box with start time and end time. After selecting the time period you want to query, you can query the power consumption of all power distribution circuits within the system project range by clicking the query button. The report can be exported and saved in Excel format via the export button, and the report can be printed via the print button.

Energy report function

Current limit setting

The current limit setting is designed for each loop of the power distribution system. It is convenient for the power distribution maintenance personnel to change the power current setting limit according to the on-site power demand in time. When the current exceeds the limit, the loop power is controlled in time to ensure the reliability of power supply and provide protection for the energy rights of users.

Power curve

In the power distribution curve graph, the mouse selects the corresponding circuit, you can query the power data within 24 hours and the past 7 days.

The power curve can help users perform power quality analysis and fault analysis.

Power curve interface

Transformer temperature

Click "transformer temperature" on the corresponding circuit of the power distribution system diagram.

You can view the operating temperature status of all transformers and the timing of fan-on time.

Transformer temperature interface

Alarms and events

Real-time alarm

The real-time alarm window monitors the remote measurement collected by the system. The alarm window will automatically open when the system is running, and it will always be hidden in the background.

When the current or voltage exceeds the limit and the alarm limit is touched, the "Corresponding Real-time Alarm" window will automatically pop up and display the specific alarm information in red font: circuit name, over-limit electrical parameters, alarm value, etc.

History alarm

By adjusting the start time and end time, you can query the system alarm information in any period of time in the past, including remote measurement alarm and remote signaling alarm, as well as specific alarm time, alarm type, alarm content, etc.

4 Conclusion

In the application of today’s power distribution facilities, the power distribution safety of substations is very important. The application of the Acrel-2000 power monitoring system introduced in this article in the commercial center plot of the urban complex in the transportation hub of Renmin South Road in Kunshan, It can realize the real-time monitoring of the power consumption of the power supply and distribution circuit of the substation, not only can display the power consumption of the circuit, but also has the network communication function, and can form a power monitoring system with serial server, computer, etc. The system realizes the analysis and processing of the collected data, real-time display of the operating status of the distribution circuits in the substation, and has pop-up alarm dialog boxes, voice prompts, SMS alarm lights for opening and closing, load limit violations, and generating various energy reports , Analysis of curves, graphs, etc., convenient for remote meter reading, analysis and research of electric energy. The system is safe, reliable and stable in operation, providing a true and reliable basis for solving electricity problems.

references:

[1]. Ren Zhicheng Zhouzhong. Principle and Application Guide of Digital Instruments for Electric Power Measurement[M]. Beijing. China Electric Power Press. 2007. 4

[2]. Edited by Zhou Zhongzhong. Smart grid user-side power monitoring and power management system product selection and solutions [M]. Beijing. Mechanical Industry Press. 2011.10

About the author: Cui Tingyu, male, undergraduate, Jiangsu Ankerui Electric Manufacturing Co., Ltd., whose main research direction is intelligent building power supply and distribution monitoring system. Email: el.cn QQ: 2881068608 Mobile: 18860995251 Tel: 0510-86179851 Fax: 0510-86179975 Website: http://