Fiber optic temperature sensor, Intelligent monitoring system, Distributed fiber optic manufacturer in China
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FJINNO provides temperature measurement systems for rail transit and subway equipment, as well as fiber optic temperature measurement devices. The subway power system generally consists of electrical equipment such as circuit breakers, transformers, rectifier cabinets, cables, and busbars. They are connected to each other by busbars, leads, cables, etc. The current flowing through the conductors and connecting parts will generate heat. Electrical equipment may have excessive local resistance due to long-term use or loose connections. When a large current passes through, it will generate high temperatures and even burn out the equipment. Therefore, the quality of the conductor connection part is the key to endangering the safe operation of the power supply system, and it is also the key to the online monitoring system of power supply equipment. The main forms of faults in power supply equipment are:
1) The main forms of faults in the circuit breaker cabinet are: eccentric and loose insertion of isolation plugs on the upper and lower parts of the circuit breaker cabinet, causing overheating, poor contact between the circuit breaker and external cable joints, resulting in heating and burnout of the equipment.
2) The main forms of faults in transformers and rectifier cabinets are: poor contact of cable joints and conductor connections leading to overheating, accelerated insulation aging leading to breakdown, resulting in phase to phase short circuits, and even equipment burning.
3) The form of cable failure in crossing tracks through pipes is: damage occurs during cable crossing due to construction or external forces, displacement and wear of the cable due to train operation vibration, and maintenance personnel cannot detect the damage to the cable inside the pipe. Under long-term current thermal effects, this damage gradually expands and deepens, leading to multiple grounding points of the cable metal sheath, resulting in circulating current in the protective layer, increasing the loss of the sheath, and in severe cases, causing the cable to overheat and burn out.
4) The form of cable failure on the upper rail is: the connection between the upper rail cable and the contact rail is not tightly pressed or gradually loosened due to harsh outdoor environments, resulting in poor contact and heating. This not only affects the quality of power supply, but can even cause equipment damage due to ignition when overheated.
5) DC grid switch cabinet: Due to design reasons, it is not possible to monitor the position status of the equipment once (in this case, the auxiliary switch contact is abnormal and cannot be switched in place, and the defect situation cannot be grasped in a timely manner). It may be due to inadequate closing, resulting in poor contact of the conductor and burning, incomplete opening, resulting in incomplete power outage, causing accidental injury or electric shock accidents.
Temperature measurement points of fluorescent fiber optic temperature monitoring device for subway power supply equipment in rail transit
(1) Online monitoring of circuit breaker cabinet
9-point method: Monitor the engagement of 6 dynamic and static contacts and 3 inlet and outlet cable joints.
(2) 6-point and 9-point online monitoring of transformers and rectifier cabinets: monitoring all incoming and outgoing cable joints.
(3) Invisible monitoring of cable insulation through rails and pipes
Using distributed optical fiber to monitor the insulation condition of the cable passing through the conduit section of the track passing cable.
(4) Online monitoring of cable connection quality at three rail points
Monitor the connection quality between the upper rail cable and the contact rail connection point.
(5) Online monitoring of DC grid switchgear
Monitor the position of the isolation switch.
