System Principles

1.Principle of Distributed Fiber Optic Temperature Measurement System

The distributed fiber optic temperature measurement system can simultaneously achieve temperature measurement and spatial positioning functions, and obtain accurate temperature information along the fiber optic distribution in real time; By combining advanced fire intelligent alarm judgment algorithms, real-time online monitoring of the entire sensing fiber optic process can be achieved.

2.Principle of operating current acquisition host

The operating current of the cable is measured using a Roche coil. A complete Roche coil current measurement system should include a coil and an integrator. The electromotive force measured by the Roche coil can be integrated through an integrator to restore the current in the conductor.

3.Principle of Cable Current Carrying Capacity Analysis Software

The cable current carrying capacity analysis software can monitor the surface temperature, ambient temperature, and operating current of the cable in real-time and across the entire range. Adopting International Electrotechnical Commission standardsThe IEC60287 and IEC60853 algorithm models provide powerful assistance for real-time calculation of conductor temperature, steady-state current carrying capacity, and dynamic current carrying capacity in cable safety monitoring and load management.

Product Features

Upload on IoT platform:Realize real-time uploading of current, temperature and other data to the Internet of Things platform, and achieve remote monitoring and cloud computing through the cloud platform, without local restrictions and quickly detecting current and responding in a timely manner, thus better protecting cable equipment.

Real time data analysis:Real time monitoring of cable operating current, ambient temperature, cable surface temperature, and cable conductor temperature, facilitating analysis of cable operating status.

Steady state current carrying capacity calculation:Users only need to set the basic parameters of the relevant cables, inCable current carrying capacity analysis softwareindeedBy specifying the cable model and surface temperature, the steady-state current carrying capacity of the cable can be calculated. Provide reference data for cable selection in the design department and adjustment of cable load in the scheduling department.

Dynamic current carrying capacity calculation:Given any two of the three values of temperature, time, and current, the third value can be calculated.canTo help evaluate the remaining load capacity of cables online, assist dispatchers in making reasonable decisions in load allocation, and achieve dynamic capacity expansion of power cables, reducing investment in transmission line construction.

Project implementation——Installation of temperature measurement host and optical cable

1. Installation of temperature measuring optical cable

Surface laying of high-voltage cables: when along the heightCable laying temperature measurement lightcableWhen, it should be adoptedsingle cableSeparate straight laying, directly tied to the cablesuperficialDirectly above, the density of the rolled strip should be as high as possible, not less than one meter apartMake the optical cable and cable in close contact as possible.As shown in the figure belowAs shown.

High voltage cable joint: The cable joint is a key monitoring area, and when laying at the cable joint, double wire winding is usedAbout 10m, used for key monitoring, the winding method is shown in the following figureAs shown.

At the ambient temperature range: When monitoring the temperature of high-voltage cables, it is necessary to find a location in the monitored cable segment that can represent the ambient temperature of the cable. A section of optical cable should be reserved at this location for monitoring the ambient temperature. The reservation method is shown in the following figureAs shown. Attention: When selecting the location of the environmental section, the temperature at that location should not be easily affected by external interference, and a constant temperature section should be chosen as much as possible.

2. Installation of fiber optic temperature measurement host

The distributed fiber optic temperature measurement host is installed in the cabinet of the substation equipment room. The installation method is shown in the following figureAs shown.