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Xu Shuang
Ankerui Electric Co., Ltd., Jiading, Shanghai 201801, China;
Abstract: This paper introduces the maintenance and upgrade project of the electric comprehensive insurance system of Gansu Northern Santai Chemical Co., Ltd., adopts intelligent power meters, and collects various electrical parameters and switching signals of the power distribution site. The system adopts the on-site local networking mode. After networking, it communicates through the fieldbus and travels to the background. Through the Acrel-2000 power monitoring system, the real-time monitoring and management of the power distribution circuit power distribution is realized.
Key words: Gansu Northern Santai Chemical Co., Ltd.; chemical industry; intelligent power meter; Acrel-2000; power monitoring system;
0 Overview
Gansu North Santai Chemical Co., Ltd. is located in Baiyin District, Baiyin City. There is a substation on site. The power distribution room is located on the third floor of the substation and the second floor is the cable tray room.
There are 14 35kV high voltage power distribution cabinets, 20 10kV power distribution cabinets and 44 0.4kV low voltage power distribution cabinets. The original 35kV and 10kV high voltage parts have a microcomputer comprehensive protection system, but this system has various problems such as misoperation of the comprehensive protection, inaccurate measurement, unclear power consumption of each process, and the combination of GB17167 on the configuration requirements of electric energy metering. At the same time, in order to facilitate the smooth development of the company unit cost assessment, it is planned to routinely maintain the protection, measurement, measurement and communication systems of the high and low voltage integrated protection devices, and upgrade the measurement system of the low-voltage comprehensive protection device. The low-voltage outlet circuit increases the multi-function power meter and integrates the data of the original high-voltage system into a set of background software to realize the power consumption monitoring and energy metering of each process.
In order to realize the intelligentization and modernization of power supply and distribution on the user side of the plant, it is necessary to equip the project with a background monitoring system with simple operation, practical functions, stable and reliable performance, and remote real-time operation of the power supply in the plant. Monitoring and realizing remote monitoring of power in each process within the plant area, facilitating management personnel to accurately grasp the power consumption of each process.
35kV and 10kV power distribution cabinets have been connected to a monitoring system. It is necessary to add monitoring and control devices to the outgoing side of the 0.4kV low-voltage cabinet and connect to the back-end system for remote monitoring. There are 44 low-voltage cabinets on the site, including 34 outlet cabinets. Since the two-way low-voltage incoming line and the emergency power supply line have been incorporated into the high-voltage cabinet back-end monitoring system, it is only necessary to add multi-function meters to the outlet circuit of the 34-face low-voltage outlet cabinet. There are a total of 236 statistical outlet circuits, some of which are included. The outlet loop is the backup loop, the outlet side is not yet wired, and the rear equipment of some of the loops has been deactivated, no more power is used. Finally, a total of 191 outlet loops need to be monitored. In order to uniformly monitor the power consumption in the plant, it is necessary to integrate the high and low voltage measurement and control devices.
Due to the modification of all the circuits, the addition of multi-function meters requires more instruments and more open-type current transformers for the transformation, and the construction cost is also higher. Now the customer proposes to use the different processes according to the different processes in the plant. The electrical equipment is placed close to the monitoring, that is, a multi-function meter monitors multiple electrical equipment in the same process. Since the on-site electricity monitoring only needs to monitor the power consumption of each process separately, this measurement method is also the same. Feasible, at the same time will reduce the amount of instrumentation and open-type transformers and construction costs, but can not check the specific power consumption of each device during monitoring and inquiry. The system host is placed in the 10kV duty room on the third floor, and the original high-pressure comprehensive insurance system is integrated. Finally, the remote monitoring of all process power is realized through our monitoring system.
1 Demand analysis
In order to ensure the statistical analysis and analysis of the power load of the plant of Gansu North Santai Chemical Co., Ltd. and real-time monitoring of dangerous sources. It is necessary to conduct real-time online monitoring of the voltage, current and power parameters of the 35KV high-voltage comprehensive protection, 10KV high-voltage comprehensive protection and low-voltage input and output line low-voltage power instruments at the project site. Once the monitoring point is abnormally monitored, the alarm can be detected in time, and the relevant personnel take necessary measures to avoid the occurrence of a safety accident. The automatic process meter reading function saves manpower and material resources. The power trend curve function can intuitively display the working status and time of each circuit, which is convenient for users to find abnormal power circuits and timely rectify and establish energy multi-level metering system to provide energy. Analysis basis.
The technical conditions are applicable to the power monitoring of the distribution room of 35KV to 10KV to 0.4KV in the plant area of ​​Gansu Beitai Chemical Co., Ltd. Supplier products should be highly safe and reliable, easy to expand, and easy to maintain and maintain. The products provided by the supplier shall meet at least the technical conditions, but not limited to this, and its technical performance shall meet the requirements for data monitoring of the power distribution room.
data collection
Automatically collect analog data of all power meters in the field, and automatically collect switch data such as field switch status and fault status.
Support real-time acquisition, automatic cycle acquisition (timed acquisition) configurable cycle (1 minute to 24 hours).
Support data transmission correctness test, abnormal data automatic processing.
Support multi-thread processing mechanism, improve data collection efficiency, and can collect data for multiple devices at the same time.
The real-time display of the data adopts the visual display mode of the power distribution cabinet at one time, and the circuit breakers are disconnected and the fault status is visually visible.
Data analysis and processing
Comprehensive statistics and analysis of data need to achieve the following functions:
The statistics and calculations of the hours, days, months, and years of the electricity consumption data of each equipment.
Count the electricity consumption (active, reactive) of each outlet circuit and sub-process.
Data query and display
It is required to facilitate the query of the client and the query of the management personnel at all levels. The query interface can meet the requirements of managers at all levels and can support flexible conditional combination query and comparative analysis. The data of various statistical analysis can flexibly adopt various charts such as reports. Intuitive display function.
The data display function is divided into operation layer and management layer according to the different permissions of different users.
authority management
It is required to assign different roles to different users, and can authorize function submenus, specific file records, data records, and the like.
The system requires a reasonable and complete user security control mechanism to effectively protect the information resources in the application environment and prevent information loss, theft and destruction.
error alarm
Fault judgment and alarm have automatic fault diagnosis and use sound and light mode alarm function. The types of alarms include microcomputer protection switch quantity displacement, voltage and current over-limit, on-site comprehensive insurance or communication failure between instrument and monitoring system. The alarm time is automatically recorded in the system database, which is convenient for users to query. The staff can grasp the real-time running status of the power distribution room at any time, find the fault of the power distribution and operate accordingly, improve the management efficiency of the power distribution, and improve the safety and reliability of the power system. Sex.
2 system plan
Acre-2000 Power Monitoring System According to the actual situation of Gansu North Santai Chemical Co., Ltd., the overall network structure adopts a serial server, 35KV microcomputer protection, 10KV microcomputer protection and low-voltage input and exit line in the duty room next to the low-voltage power distribution room. The instrument is directly connected to the serial port server through the shielded twisted pair cable, which ensures the stability and real-time performance of the power monitoring system transmission.
1) Station management
The management of the station control management system for the power monitoring system is a direct window for human-computer interaction. In the maintenance and upgrading project of the electric comprehensive insurance system of Gansu Beitai Chemical Co., Ltd., it mainly refers to the monitoring host placed in the duty room.
2) Network communication layer
The communication layer is mainly composed of a N2S16-485I-ETS serial server in the duty room, an Ethernet device and a bus network. The main function of the serial server is to monitor the on-site 35KV, 10KV microcomputer protection, low-voltage power meter; the main function of the Ethernet equipment and bus network is to realize the data interaction between the station control management layer and the field devices, so that the distribution system management is centralized and information It is intelligent and intelligent, which greatly improves the safety, reliability and stability of the power distribution system, and truly achieves the goal of unattended operation.
3) Field device layer
The field equipment layer is a data acquisition terminal, which is mainly composed of 35KV, 10KV microcomputer protection, low-voltage power meter DTSF1352-C. The microcomputer protection and intelligent instrument are connected to the duty room through the shielded twisted pair RS485 interface and the MODBUS communication protocol bus type connection. On the serial server.
System structure diagram
Smart meter field connection
The field instrument is connected by hand to the serial port server in the data collection box of the corresponding power distribution room through the shielded twisted pair (RVSP2*1.0). The number of smart meters connected to each bus is about 20, and then passes through Baotou Suning Plaza. The intranet uploads the data to the local monitoring terminal. The specific connection diagram is as follows:
3 system function
The real-time monitoring system diagram of the substation is the main monitoring screen. The main operation status of all circuits in the substation is monitored in real time. Red represents the closing and green represents the opening. In the system diagram, you can visually see the operating parameters of the high-voltage cabinet corresponding to the microcomputer protection and the operating parameters and status of the incoming and outgoing lines of the low-voltage part. You can see all the conventional power parameters of the on-site intelligent microcomputer protection and power meter, such as: three-phase. Voltage, current, active power, reactive power, power factor, frequency, active power, etc. As shown below:
35KV high voltage primary system diagram
10KV high voltage primary system diagram
Low pressure primary system diagram
Low pressure primary system diagram
The remote signal and telemetry alarm function mainly completes the switch operation status of the high and low voltage circuits and the load incoming line monitoring. The switch position and the load limit alarm pop-up alarm interface indicate the specific alarm position and sound alarm, reminding the on-duty personnel to deal with it in time. The load limit is freely set under the corresponding authority. 
Current limit setting
The event alarm recording function mainly completes the alarm information event record and the occurrence time of the alarm time period, provides the basis for the on-duty personnel and analyzes the cause of the accident.
Alarm window
The parameter meter reading function mainly queries the electric parameters of the high and low voltage outlet circuits. Supports electrical parameter query at any time, with functions such as data export and report printing. The report queries the electrical parameters of different circuits corresponding to different processes in the high and low power distribution room of the maintenance and upgrade project of the power comprehensive protection system of Gansu Northern Santai Chemical Co., Ltd., including: three-phase current, active power and active power. The loop name of the report is associated with the database, which is convenient for the user to modify the loop name. As shown below:
Electrical parameter reading
The electricity consumption report function can select the time period for query, and support the electric energy cumulative query of the loop/equipment/process in any time period, and has the functions of data export and report printing. Provide accurate and reliable energy reports for duty personnel. The loop name of the report is associated with the database, which is convenient for the user to modify the loop name. As shown in the figure below, the user can directly print the report and save it to another location in EXCEL format. As shown below:
Detailed equipment energy report
Sub-process energy report
The schematic diagram of the system communication structure mainly shows the networking structure of the system. The system adopts a layered distributed structure and monitors the communication status of the interval layer devices. Red indicates normal communication and green indicates communication failure. The following figure shows the state of the substation communication.
Communication structure diagram
User rights management, giving different users the rights to different roles, can be authorized to function submenus, specific file records, data records, and so on. The figure below shows the rights configuration interface. 
User rights management
4 Conclusion
In today's power distribution facility applications, the distribution safety of large-scale plant projects is of paramount importance. The application of the Acrel-2000 power monitoring system described in this paper can be realized in the maintenance and upgrading project of the power comprehensive protection system of Gansu Beitai Chemical Co., Ltd. Real-time monitoring of the power supply and distribution circuit power distribution in the power distribution room, the system analyzes and processes the collected data, displays the running status of each power distribution circuit in the power distribution room in real time, and has a pop-up alarm dialog box and an audible prompt for the load limit. Generate various energy reports, etc., to facilitate remote meter reading and analysis and research of electric energy. The system is safe, reliable and stable, and provides a reliable and reliable basis for solving the problem of electricity use.
references:
[1] "Principles and Application Guidelines for Digital Measurement of Electric Power Measurement", Ren Zhicheng, Zhou Zhong, China Electric Power Press
[2] Zhou Zhongbian. Product selection and solution for smart grid customer power monitoring and power management system [M]. Beijing. Mechanical Industry Press
[3] "Power Monitoring for 10kv Power Supply and Distribution Design", Yao Qiang, Technology World
[4] "Application of Power Monitoring System in Power Supply and Distribution Design", Gao Shihong, Technology Wind
[5] GB17167-2006 "General Rules for the Provision and Management of Energy Metering Apparatus for Energy Consumption Units"
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