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How to measure temperature of cable joints in ring main unit

Fiber optic temperature measurement system for cable joints in ring main unit
Power cables are widely used in power system transmission and distribution due to their durability, small footprint, and ability to be laid in various situations. However, the internal cable joints of the ring main unit are prone to heating due to various reasons, and the degree of heating will affect the operation of the ring main unit itself and even the safety of the entire power grid. Excessive temperature of cable joints can cause severe oxidation, leading to a sharp reduction in the service life of the cable; Causing cable joint explosions, insulation breakdown, combustion and other hazards, resulting in large-scale power outages and fire accidents. In order to achieve real-time online monitoring and alarm of cable joints, it is necessary to add temperature sensors for real-time temperature monitoring of cable joints.

The fiber optic temperature measurement system for the cable joint of the ring main unit adopts a fluorescent fiber optic temperature measurement device. The sensing probe of this device is made of imported quartz fiber optic material, which has complete electrical insulation and is not affected by high voltage and strong electromagnetic fields. It is resistant to chemical corrosion and pollution. Moreover, the temperature measurement probe has been processed by our company to increase the temperature measurement area, which can measure the temperature of the outer wall of the cable joint. The response speed is fast, the installation is simple, and it is resistant to high temperatures. At the same time, the system also provides remote web transmission, making it convenient for customers to install communication software and remotely monitor on any computer.

Construction goals for fiber optic temperature measurement of cable joints in ring main unit cabinets
1) Establish an automatic meter reading and fiber optic temperature measurement system for the cable joints of the power consumption control ring network cabinet, to achieve automatic meter reading and statistics of electrical energy data in the temperature measurement system software, remote login access automatic supplementary reading, on-site reading, monitoring and remote control of the temperature of each user’s electrical cable joints, electricity consumption inquiry of each user, payment and recharge, and other functions. Real time monitoring of the temperature of each household’s consumption and each ring network cabinet cable joint.

2) Users can log in to the WEB website of the temperature measurement system software to check real-time temperature, historical data, outstanding payment details, and account balance for payment.

3) Important meter failure information: When the temperature of the cable joint exceeds the alarm value, an alarm should be promptly issued to the supervisory personnel. The system management personnel use the system to monitor the equipment and update internal parameters.


Design principles for fiber optic temperature measurement of cable joints in ring main unit cabinets
Principle of practicality
The system construction adheres to the principle of practicality. On the basis of practicality, progressiveness and foresight are considered, and standard, advanced and mature products and development platforms are selected to build a system that is practical and solves practical problems.

Standardization principle
Business applications have the characteristics of complex business, numerous processes, large amount of information, and multiple application levels. Through unified application function planning, consensus can be reached on business operations at the application level, guiding various business units to carry out business with unified standards.

The system software and hardware platforms and application development tools used in the construction of business applications should comply with national standards, standards of the Ministry of Information Industry, relevant technical specifications and requirements of the company.

The principle of uniformity
Following the policy of centralized information management, overall planning, overall design, and step-by-step implementation, the implementation process embodies four unified principles: unified leadership, unified planning, unified standards, and unified organization and implementation.

Reliability principle
The software and hardware resources need to ensure the uninterrupted and reliable operation of the cable temperature measurement system for 7 × 24 hours. Therefore, it is necessary to equip a complete design of reliability measures to ensure the high reliability of system operation and fully consider the reliability requirements of key system applications.

Reliable security mechanism
This system adopts a series of secure encryption measures, with a built-in 64 bit encryption algorithm. The system has higher security and can effectively prevent data leakage and theft, ensuring the security, accuracy, and integrity of the system’s data, and preventing illegal operator operations and legitimate operator illegal operations. A system may be used by multiple operators, and to ensure system security, hierarchical permission management is implemented. The system administrator authorizes operators with different usage permissions, and each operator can only perform various operations within the scope of permissions, resulting in higher system security.

The operation interface is simple, friendly, and highly intelligent
The system provides most of the default data required during operation, and each operation conforms to the actual business workflow, avoiding repetitive operations by operators. The system automatically checks the legality of the input data and provides friendly prompts for operator errors.

Reasonable system structure design, high degree of abstraction of program functional modules
It can be flexibly configured according to the changes in the actual situation of users and the various needs of different users, to maximize the satisfaction of user needs. There are various rate management and multi type table management functions for users to better use this system.

The system adopts a Web Service platform and a B/S architecture design, which is in line with the trend of application development.
Stable operation, reliable data, actual operation of thousands of systems, and over 200 new projects added each year.
The platform is easy to operate, easy to master, and the installation process is simple. Data can be automatically generated into various reports as needed, improving management efficiency.
Network topology of fiber optic temperature measurement system

1.1 Overall structure framework of network system

The system consists of five parts: the main station, switch, repeater, transmitter, and fluorescent fiber optic probe. The system master station includes the master station hardware equipment (local server, client workstation, switch, etc.) and the master station software system (operating system, fluorescent fiber optic temperature measurement software, master station application management system).


The data transmission channel between the backend system and the collection device is an uplink channel, and the communication method adopts wireless GPRS or Ethernet.

Ethernet or GPRS/CDMA communication is used between the switch and the repeater, and each switch supports 24 10/100Mbps adaptive Ethernet ports.

RS485 or wireless 433M communication method is used between the relay and transmitter

The temperature measurement system in the backend main station system: All data collection, management, and temperature display are completed by the main station application software, and the system mainly realizes the data collection and monitoring of temperature measurement.

The uplink communication channel of the switch can adopt Ethernet mode.
The downlink communication of the switch adopts Ethernet or GPRS/CDMA communication methods.
The uplink communication of the relay adopts Ethernet or GPRS/CDMA communication methods.
The downlink communication of the repeater adopts RS485 or GPRS/CDMA communication methods.
The transmitter integrates multi-channel fluorescent fiber optic, providing external 485 communication and anti-interference design.
Composition of fiber optic temperature measurement system for cable joints in ring main unit
The fiber optic temperature measurement system for ring main cabinet cable joints consists of a local server, client computer, switch, repeater, transmitter, fluorescent fiber optic and demodulator.

Application functions of fiber optic temperature measurement system for cable joints in ring main unit
Real time monitoring of fiber optic temperature measurement for cable joints in ring main cabinet
The data collection density can be set according to customer needs, and the system will collect data regularly based on the set parameters. Then, it will be displayed in table form or curve drawing to achieve real-time monitoring. Real time monitoring of equipment operation status; Real time monitoring and recording of cable joint temperature.

Remote web access function for fiber optic temperature measurement of ring main cabinet cable joints
Customers can download monitoring software from other computers and log in to access temperature data on the server.

Basic functions of fiber optic temperature measurement host for ring main unit cable joints
1) Temperature data query

You can query temperature data for specified dates, browse, print, and export to Excel.

Historical temperature data storage
Permanently record temperature data

2.4 SMS reminder
According to the SMS sending requirements, the system will send the following SMS:

Alarm SMS notification
When the temperature of the cable joint exceeds the set alarm value, a text message will be sent to inform the staff.

Abnormal SMS notification
When the transmitter is abnormal, a text message will be sent to inform the staff.

Fiber optic temperature measurement safety design for cable joints in ring main unit
The security of the system is crucial, therefore, in the design of the main station system, the security of the system should be fully considered to prevent unauthorized intrusion and leakage of confidential information. From the perspective of main station system security protection, the system provides security protection in both communication channels and system data.

Data security of fiber optic temperature measurement system for ring main cabinet cable joints
Equipped with three-level security mechanisms at the operating system level, database level, and application software level.

Operating system level: Set different permission passwords on the network, non system administrators cannot operate servers and databases, and ensure system security and relative independence through routing, firewall, and other settings.
Database level: Set up demanders with different permissions and corresponding passwords in the database to ensure that unauthorized demanders cannot use data, and different demanders cannot use data beyond their level.
Application software level: Provides strict user login verification, permission control, and comprehensive management of event logs and operation records. System permission control includes functional permission control and data access permission control.
Function permission control:

The functional permission control system manages permissions from three dimensions: control objects, object operations, and operators. Based on this, it provides authorization methods for control object groups, operation groups, and operator roles. The accuracy of permission control can be determined to specific control objects and operators. The system determines the operation permissions of the login personnel based on these three dimensions.

The control objects of the system include system level nodes, terminal devices, etc. Each control object has corresponding operations, and each authorization includes three parts: a control object group, an operation or operation group, and an operator role. In order to simplify and facilitate permission management, the system provides control object group permission inheritance.
The system provides a hierarchical authorization mechanism, which enables the system to have the ability of distributed permission management and solves the problem of overly complex permission management.

Data access permissions:

The data access permission control mechanism adopts the security audit mechanism provided by the database, providing data access user control, and providing log auditing for all data operations.

The original database only has query functionality, and the applications used only operate on the application database to ensure data security.
The system can store electricity consumption data with time markers and various analytical application calculation data, with a storage time of more than 2 years. In addition, the system has a powerful backup subsystem.
Detailed operation log records are available for all manual intervention data. The system design ensures high fault tolerance, and the database has three levels of data validation: field level, record level, and database level, ensuring the storage of illegal data.
Introduction to fiber optic temperature measurement transmitter equipment for ring main cabinet cable joints
Main characteristics of fiber optic temperature measurement for cable joints in ring main unit cabinets
The fluorescent fiber optic temperature transmitter is wall mounted. This product has unique technical advantages in temperature measurement in special environments such as high voltage and strong electromagnetic interference. The temperature hotspot and measurement signal receiving part of the fluorescent fiber optic temperature sensor used in the transmitter are not electrically connected, which can work with high precision and stability for a long time, greatly improving its application range. At the same time, fiber optic temperature transmitters effectively eliminate the hidden dangers of the winding of conventional dry-type transformers being used in excessively high temperature environments for a long time, which may shorten its lifespan, or even burn out the winding, which is not conducive to the safe operation of the transformer. The transmitter has high accuracy and sensitivity, is resistant to high pressure and corrosion, can be remotely monitored, has a long service life, is small in size, makes instrument maintenance simple and convenient, and ensures safe transportation. Its internal modular integrated design is aesthetically pleasing and reasonable

Main functions of fiber optic temperature measurement system for cable joints in ring main unit
Can install an integrated multi-channel fluorescent fiber optic temperature measurement and demodulation instrument;
Provide RS485 communication interface to connect with the upper computer or LCD display instrument;
Provide temperature collection and transmission



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