Reasonable construction of power monitoring system to ensure orderly energy conservation and emission reduction

Energy conservation and emission reduction has become a basic national policy of our country. In the power supply and distribution system of the integrated communication building, the power consumption of various equipment can be monitored in real time through the power monitoring system, and a large amount of detailed operation data can be obtained, so as to realize the refined management of power consumption. At the same time, through the further development and improvement of the application functions of the power monitoring system and the in-depth analysis of the monitoring data, it can play an important role in the following aspects: discovering the key links of power consumption and providing a basis for the direction of energy conservation work; by obtaining objective and real energy-saving data, scientific evaluation of energy-saving technology can be realized; discovering unreasonable power consumption links and preventing the occurrence of leakage, bubbling, dripping and leaking during power consumption.

Selection of monitoring objects and evaluation indicators

For integrated communications buildings, the monitoring objects are different electricity consumption links, which can generally be divided into five parts: total power consumption of the integrated building (mains power), production power consumption, office and business hall power consumption, and diesel engine power generation. In actual construction, different power loads can be measured in detail and refined management can be implemented.

Production electricity consumption is the focus of energy consumption monitoring in integrated communication buildings. In order to measure production energy consumption indicators, the concept of power usage efficiency (PUE) is currently widely used.

The calculation formula for the power usage efficiency of the communication room is: PUE = total power consumption of the room / power consumption of the main communication equipment.

The total power consumption of the computer room is the total power consumption of the lighting, air conditioning (and other refrigeration equipment) and main communication equipment in the computer room. In principle, the power consumption of the main communication equipment should be measured at the output end of the switching power supply and UPS to deduct the power supply equipment efficiency and battery loss.

Selection requirements for smart meters

At present, there are many manufacturers of smart meters in China. Therefore, in the construction of the power monitoring system, the meters should be carefully screened and compared to meet the requirements of power management in daily management and maintenance. The selection and installation of meters should also be considered from the following aspects.

Installation

There are many types of power distribution cabinets used in communication rooms. Therefore, when monitoring the power consumption of the power distribution system in the communication room, the selected electric meter must have a flexible installation method. It can be installed in the distribution cabinet, in the 19 rack, and on the wall to meet the needs of on-site installation in the communication room.

Monitor power and operating power requirements

Currently, most of the meters provided by meter manufacturers are AC meters. For the communications industry, when monitoring the power consumption of different communication rooms or measuring them by profession, DC meters are also needed to monitor the DC power consumption. Therefore, the selected meter model should be able to meet the monitoring of AC and DC power consumption, and should be able to work normally under -48VDC and 220VAC power supply conditions.

Meter Network Requirements

The electric meter in the communication room should have an RS485/422 interface, and the communication protocol should meet the requirements of the serial bus. In order to ensure the compatibility and interchangeability of the electric meter and simplify the networking of the electric meter, the future development direction should be that AC and DC electric meters of different manufacturers and models should be able to be included in one data bus to avoid large investments in the networking part of the electric meter when adding or replacing the original electric meter in the future.

Monitoring Power Shunt Requirements

For AC meters, there should be multiple options to choose from, such as 3 single-phase inputs (corresponding to 1 three-phase input), multiple single-phase inputs (such as 9, 12, 24, etc., corresponding to 3 three-phases, 4 three-phases and 8 three-phases respectively); for DC meters, there should also be single-channel and multi-channel options to meet the needs of total output of switching power supply, DC panel output branch and terminal cabinet monitoring.

On-site storage, query and display requirements

To facilitate on-site maintenance, the electric meter should have the function of storing, querying and displaying historical data and historical alarms; at the same time, on this basis, when problems occur in transmission and the monitoring system cannot operate normally, all kinds of operating data during the monitoring interruption period can be completely preserved.

Requirements for power distribution cabinet transformation

During the implementation of the power monitoring system, since the power distribution cabinets that need to be monitored are installed in the early stage of the project, the original power distribution cabinets are often modified in the project, such as installing new current transformers and meters in the original power distribution cabinets. Due to the diversity of distribution cabinet types, the distribution cabinets that need to be modified are all running on the grid and generally cannot be modified by power outages. Therefore, different modification plans need to be adopted according to different situations during the construction stage of the project, fully considering possible problems and emergency plans, and requiring rich experience for the design unit and construction unit.

Networking solution for power monitoring system

The power monitoring system can be networked independently or integrated into the dynamic environment monitoring system to become a subsystem of the dynamic environment monitoring system.

When the power monitoring system is networked independently, it is completely independent of the original dynamic environment monitoring system. It independently configures access equipment and transmission equipment, occupies a separate transmission channel, and finally forms a dedicated power monitoring system.

When the power monitoring system is incorporated into the dynamic environment monitoring system, the power monitoring system can be considered as a subsystem of the dynamic environment monitoring system central software, or a separate power monitoring business station and database server can be considered.

The construction of the power monitoring system is of great significance for the refined management of power consumption in the integrated communication building and the scientific guidance of the smooth implementation of energy conservation and emission reduction work.

It should also be noted that since the construction of the power monitoring system requires the modification of the original equipment, there is a situation where the equipment cannot be powered off during construction, and the project has certain risks. Therefore, choosing a reasonable construction plan and safe construction are important aspects to ensure the smooth implementation of the power monitoring system.