I. Background
Power grid companies have put forward specific management requirements for full lifecycle management of assets, carried out the linkage correspondence among PMS, PM, and AM data of existing assets, and incorporated the results into the 'Asset Full Lifecycle Management Integrated Platform' for indicator assessment. However, asset changes still lead to declining data quality. If new management methods are not adopted, the earlier linkage results cannot be effectively consolidated. Therefore, it is necessary to apply new technologies to asset lifecycle management, enabling timely transmission and feedback of asset change information, closely linking business at all stages with 'on-site physical objects', and forming horizontal and vertical closed loops.
II. Solution Objectives
By establishing a physical identification system for equipment and integrating the physical flow, information flow, and value flow of assets, the goal is to achieve 'permanent linkage consistency among accounts, cards, and objects' and sharing of information across all stages. State Grid and China Southern Power Grid are actively conducting research and application of RFID technology in asset management, smart warehouse management, and other systems. However, there is no standard model for RFID in the full lifecycle tracking management of power grid assets, and a systematic reference basis is lacking.
This solution enables precise management of the equipment lifecycle, with dynamic tracking through daily operation and maintenance of physical identification data, eliminating management difficulties, blind spots, and obstacles, and achieving precise positioning management.
III. Solution Overview
This solution is tailored by FineJoin after analyzing enterprise needs, integrating RFID technology, network technology, computer technology, database technology, and wireless communication technology. The solution manages RFID devices, exchanges data with systems such as PMS and SAP, performs comparison and analysis of account-card-object consistency, generates management reports, uploads and downloads business data with RFID handheld terminals, and carries out daily dynamic management of physical identification.
IV. System Design
1. Selection of Collection Equipment
The application of RFID technology in power grid asset tracking management requires extensive use of handheld collection terminals. When operating in an electromagnetic field environment, the following factors must be considered:
2. Physical Identification Performance
RFID physical identification offers advantages such as waterproofing, magnetic resistance, high temperature resistance, long service life, long read distance, data encryption, large data storage capacity, and modifiable stored information. It primarily uses ISO18000-6C metal tags. The following must be considered during design:
3. Standardization of Tagging Specifications
Tagging specifications clearly define the installation locations for each type of equipment. The formulation should consider factors such as the characteristics of outdoor/indoor equipment, the read/write distance and angle between handheld devices and tags. Currently, passive metal electronic tags are primarily used for RFID in substations, but it is not yet practical to install them directly on outdoor current transformers, voltage transformers, lightning arresters, and other equipment bodies — 'tag information beyond 2m cannot be read'.
4. Physical Identification Middleware and System Integration
The RFID middleware system for power grid companies is commonly developed based on a SOA architecture pattern, integrating API interfaces provided by RFID reader manufacturers into the middleware system. The middleware can monitor the operation of RFID devices and facilitate data interfaces and exchange with systems such as ERP.
The RFID middleware system and on-site collection devices collect physical identification data, and through interfaces, feedback physical information to the asset full lifecycle management evaluation and decision system, achieving a true vertical closed loop of account-card-object consistency.
5. Physical Identification Data Storage and Data Security
ISO18000-6C standard electronic tags are mature, stable, widely used, have globally unique ID numbers and support simultaneous reading of multiple tags. They can store 1024b or 2048b data, with a read speed of 40kb/s. The information stored in the tag must consider the data exchange between handheld devices and the backend during on-site operation and maintenance — given the stability issues of GPRS communication transmission, it cannot be guaranteed that backend data can be obtained smoothly at any time.
6. Data Transmission Security
Power grid companies employ strict isolation measures for external mobile storage devices or mobile transmission methods to prevent data risks. This makes it difficult to timely upload collected information from handheld devices, and business documents in the middleware system cannot be conveniently uploaded to handheld terminals. Multiple conversions via secure USB drives are required. Such overly cumbersome operations may affect the enthusiasm of asset management personnel in applying RFID technology, so data transmission and security issues must be fundamentally resolved.
7. Tagging Granularity
Power grid companies have already carried out synchronization of PMS and SAP PM module equipment, including primary and secondary equipment synchronization, currently only for major equipment. Tagging based on PMS system data has the finest granularity and the largest workload, but during the tagging process, the quality of PMS and PM synchronization and AM linkage can be checked, which has a positive effect on improving the consistency rate of accounts (PM), cards (AM), and objects (RFID physical tags).
V. System Operation Flow
1. Tagging Business After Equipment Enters Warehouse
After equipment procurement and warehousing, for materials whose material codes have already established linkage with equipment types and asset categories, physical tags can be attached in advance. Managers generate a 'Physical Tagging Business Order' in the middleware system based on the synchronized SAP MM module warehousing information, use an RFID reader to write material codes and equipment types into the physical tag, and attach it to the corresponding material with double-sided tape.
2. Tagging Business for Materials Directly Sent to Site
Most power grid equipment is delivered directly by manufacturers to construction sites. Staff issue a 'Physical Tagging Task Order' in the RFID middleware system, notifying on-site managers to download the task order via RFID handheld terminals, accept the on-site materials, and perform tag attachment.
3. Tag Information Completion After Completion and Commissioning
After the construction project is completed and commissioned, relevant equipment information and dispatch names are entered into the PMS system. After the RFID middleware collects information from the PMS system, staff issue a 'Equipment Commissioning Tag Information Maintenance Order', notifying to download the task order to the handheld terminal, and then complete or change the information in the attached tag on site.
4. Tag Management Business for Technical Upgrades and Overhauls
If equipment is added in a substation due to technical upgrades, tags need to be attached, and after major repairs or routine maintenance, tag information needs to be updated. Staff create a 'Tag Installation and Information Maintenance Task Order' in the RFID middleware system, and download the task order via handheld RFID reader terminal.
5. Business Implemented by RFID Handheld Terminal
The RFID handheld terminal system interfaces with the RFID middleware, downloading tasks such as asset addition, scrapping, and inventory to the handheld terminal, and uploading results after collection. The handheld device can also independently perform daily inspection of equipment tags.
#### 5.1 Daily Tag Operation and Maintenance Business
Power grid equipment operation teams regularly carry out daily tag scanning tasks to verify that the tag information matches the on-site equipment information.
#### 5.2 Asset Inventory and Check Business
The previous 'paper inventory mode' had drawbacks such as duplicate data entry, missed or repeated equipment checks, lack of process control, high labor intensity, and superficial checks. Using tag inventory allows full monitoring of the inventory process, avoiding the drawbacks of manual checks, shortening inventory time, and improving inventory quality.
Download inventory tasks via the RFID middleware, start inventory after the handheld terminal downloads the inventory task order, and record any issues discovered in the handheld terminal.
VI. Main Equipment Deployment
1. UHF Anti-Metal Electronic Tag
The UT503 UHF plastic shell tag is suitable for attaching to metal surfaces and working normally. It uses an ABS plastic shell with ultrasonic welding encapsulation, has good waterproof characteristics, an IP65 protection rating, and a specially designed anti-metal inlay internal antenna that can be fixed to metal surfaces. The read distance can reach 8 meters, and it is low-cost, widely applicable to pallet management, shelf management, asset management, etc.
2. FN M11 UHF Handheld Terminal
The FN M11 is a rugged, multi-functional industrial-grade mobile data collection terminal. It combines data collection modules such as RFID identification, 1D/2D barcode scanning, fingerprint collection, image collection, GPS information, etc., with wireless communication technologies such as 4G full Netcom, WiFi, Bluetooth, and 433MHz. It can collect various data anytime and anywhere and interact with the backend server in real-time via wireless communication, meeting various mobile operation needs.
