Overview
With the development and popularization of computer technology, the use of computer technology to realize the intelligent management of buildings has become the basic requirement of modern buildings. Now, the unified monitoring of the mechanical and electrical equipment in the building through the Building Automation System to achieve the purpose of simplifying management, improving efficiency, and saving energy has become a common and mature application method for large buildings. Building a complete BA system in a building can realize centralized management and monitoring of various mechanical and electrical equipment in the building. Among them, the monitoring and management of medium and low voltage power transformation and distribution systems is an important part of building equipment monitoring.
With the rapid development of network technology, field bus technology and measurement and control technology, the traditional power transformation and distribution system is developing towards the direction of intelligent measurement and control, unattended monitoring, and networked information exchange. The power monitoring system has been widely used in the field of power transformation and distribution, and has become a powerful tool for scientific management of power operation, energy saving and consumption reduction.
Reference standard
JGJ16-2008 Code for electrical design of civil buildings
JGJ242-2011 Code for Electrical Design of Residential Buildings
GB50314-2015 Intelligent Building Design Standard
GB50016-2014 Code for fire protection of building design
GB/T16435.1--1996 Telecontrol equipment and system interface (electrical characteristics)
GB50054-2011 Low-voltage power distribution design code
System structure
The power supply and distribution system of an intelligent building consists of a high-voltage power supply system, a low-voltage power distribution system, a substation and electrical equipment. Usually, for large buildings or building communities, the power input line is mostly 10KV, and the electric energy first passes through the high-voltage power distribution station, and then the high-voltage power distribution station distributes the power to each terminal substation. The 10KV high voltage is reduced to the voltage (380/220V) required by the general electrical equipment through the distribution transformer, and then the low-voltage distribution line distributes the electrical energy to the electrical equipment for use.
Similar to the structure of the power supply and distribution system of intelligent buildings, the Sfere-PMS power monitoring system adopts a layered and distributed structure design, which consists of a system management layer, a network communication layer and an on-site measurement and control layer.
System management layer: The system management layer is the highest layer of the system, which consists of the system software platform and hardware such as industrial computers, UPS power supplies, and printers. The network communication layer is connected with the on-site measurement and control layer to realize the parameter configuration, data acquisition, state monitoring and analysis, operation optimization control, interpersonal interaction and system information release of the equipment, and realize the monitoring, network connection and data management of the entire system.
Network communication layer: The network communication layer is a network composed of various communication devices and communication media, which realizes the information exchange between the overall management layer of the system and the equipment at the on-site measurement and control layer. The network generally adopts industrial Ethernet, optical fiber ring network and RS485 bus structure, mainly including S3100 series communication management machines, industrial Ethernet switches, optical fiber transceivers, optical fibers, communication cables and other equipment.
On-site measurement and control layer: It is composed of various types of intelligent instruments and devices installed to realize the functions of measurement, monitoring, communication and control. Based on the measurement, control and communication functions of the field measurement and control layer equipment, the system can realize the "four remote" functions.
Design equipment mainly includes: sfere series power quality detector, WDH-31 series motor protection controller, SDP5100 series microcomputer comprehensive protection device, intelligent digital display instrument, intelligent control device, transformer temperature controller, intelligent water meter and other field equipment.
System features
The configuration method is convenient. According to the actual system characteristics, it supports one-time system working condition graphic drawing, flexible switching of multi-level interfaces, which is convenient to intuitively understand comprehensive monitoring information from different angles.
Strong expansion performance. Support a large number of third-party devices and various fieldbuses, such as RS485, CAN, Profibus, Industrial Ethernet, etc.
Flexible networking. Supports single-station monitoring, dual-machine hot-standby redundant monitoring, dual-network redundancy, and multi-station distributed monitoring modes with C/S and B/S structures. It can greatly improve the scale and operational reliability of the overall system.
Rich application controls. Provide various kinds of graphical display, trend analysis, report tool, operation diagnosis, etc., which is convenient for users to configure a fully functional operation project without any underlying development.
Network interconnection is powerful. It has DDE interface, OPC, serial port and TCP/IP data forwarding, etc. for system interconnection with various upper-level systems such as BA system, and has strong scalability.
System functions
system operation monitoring
Users can intuitively and real-time understand the status of high and low voltage circuit switches, as well as circuit current, voltage, power and other power parameters through the primary diagram of the power distribution system.
System limit alarm
The user can set the alarm settings for each power parameter of each circuit through the computer's interactive interface. For example, the upper limit value of the current of a certain circuit can be set. As long as the circuit current is greater than this value, the system will immediately generate an alarm and output it to the computer interface to warn the operating user. (It can display which loop has what alarm, etc.). At the same time, the system records all alarm records, and it is convenient to analyze the capacity and load of each circuit.
Graphical analysis
The system can generate dynamic image systems, such as pie charts and phase angle charts, to intuitively reflect the operating status of the system and meet the different needs of users.
Real-time data reporting system
The system dynamically compares and monitors each loop, and the real-time report can directly export data in EXCEL format, which is convenient for users to print and organize.
Historical data report query
The system can provide daily reports, quarterly reports, monthly reports, annual reports and other types of reports, which are convenient for users to query, count and analyze historical data such as current, voltage, power load, and electric energy measurement.
Event record and inquiry
The computer records all events of the whole system in real time, including: protection events, operation events, alarm events, etc., and the occurrence time and location of each event can be queried in the form of reports, which can provide powerful fault data reports for operation and maintenance personnel.
