Fiber optic temperature measurement device for subway power system, system manufacturer, mai bayarwa

Fiber optic firikwensin zafin jiki, Tsarin sa ido na hankali, Rarraba masana'antar fiber optic a China

The subway power system generally consists of electrical equipment such as circuit breakers, transformers, rectifier cabinets, cables, busbars, da dai sauransu. They are connected to each other by busbars, leads, cables, da dai sauransu. 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. Saboda haka, 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 equipment damage.

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.

Monitoring methods for power supply equipment

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. Online monitoring of transformers and rectifier cabinets

6-point and 9-point: Monitor 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.

Why does the traction power supply system of rail transit need to use mai kyalli fiber optic ma'aunin zafin jiki

Tsarin samar da wutar lantarki don isar da wutar lantarki a cikin zirga-zirgar dogo na birni a China sune DC750V da DC1500V, daidai da hanyoyin tattarawa na yanzu na layin dogo na uku da cibiyar sadarwar sama da sama, bi da bi. Matsakaicin wutar lantarki na iska na biyu na na'urar wutar lantarki ta tsarin samar da wutar lantarki ya wuce 1000V, amma iyakar ma'aunin da aka ƙayyade a cikin “Electronic Mai Kula da Zazzabi for Transformers” (JB/T7631-2016), wanda ke amfani da Pt100 azaman firikwensin zafin jiki, za a iya iyakance kawai zuwa ƙasa da 1000V. Saboda haka, Jirgin ƙasa yana da buƙatun juriya mafi girma don binciken firikwensin zafin jiki da jagora.

The fiber optic temperature controller for rail transit uses FJINNO’s fluorescent fiber optic temperature sensor as the temperature sensing element. Wannan kashi na zafin jiki ba shi da kariya daga tsangwama na lantarki kuma yana da juriya ga babban ƙarfin lantarki (100KV/fiber zuwa nisan gubar ƙasa na 0.4m). Ma'aunin zafin jiki na Fluorescent fiber na gani gaba ɗaya yana yanke tsangwama na abubuwan auna zafin jiki da ake watsawa zuwa mai sarrafa zafin jiki daga tushen auna zafin jiki., inganta matakan aminci na jigilar dogo.

Advantages of Fluorescent Fiber Optic Temperature Measurement System Applied in Rail Transit

Domin yanayin aiki na tashar jirgin ƙasa transit, Warewa da kariya daga siginonin kutsawa na lantarki na waje ana samun su daga wutar lantarki, ƙarshen shigar da sigina, ƙarshen fitowar sigina, da kwandon sarrafa zafin jiki.

Tsarin samar da wutar lantarki na jigilar wutar lantarki ta hanyar jirgin ƙasa ya dogara ne akan DC750V da DC1500V, yayin da kewayon ma'aunin da aka ƙayyade a cikin “Mai Kula da Zazzabi na Wutar Lantarki don Masu Canjawa” (JB/T7631-2005), wanda ke amfani da Pt100 azaman firikwensin zafin jiki, za a iya iyakance kawai zuwa ƙasa da 1000V. Saboda haka, Fiber na gani zafin jiki mai kula yana da matuƙar ƙarfi ƙarfin lantarki juriya kuma zai iya jure 100KV.

A mayar da martani ga vibration, kura, zafi, gurbacewar mai da sauran wuraren aiki a wurin, multi-layer protective measures are taken to ensure that the optical fiber temperature controller for rail transit has good electromagnetic compatibility, tabbatar da kwanciyar hankali da ingantaccen aiki na mai kula da zafin jiki.