Analysis of 723 high-speed train accident

 Since October 1, 1964, Japan's "Shinkansen" opening, high speed train has been in operation for 47 years. High speed trains and favored by all because of fast, safe, comfortable, the Japanese Shinkansen every 4 minutes a day column, 750 column; still no one casualty records, this year 9 - magnitude earthquake has not occurred derailment accident. High speed train De, France has become the first choice for travel. The high speed train Chinese (High-speed Rail and EMU) of rapid development, reflects the Chinese construction achievements, we should be proud of. The 723 accident made us very sad, but also in the world is bad. The pain will reflect, the problem does exist signal of our system, but the human factors are the main reason, according to the news release, can confirm the following reasons:

(a) Cangcu run is hidden dangers of accidents: the Beijing Shanghai High-speed Rail to grab the opening in June 30th, line contact network for strengthening construction has been carried out by the end of 6, and without the full commissioning test, cangcu run is the biggest hidden dangers.

 Traction power system of high speed train is a multifunctional integrated system, high quality requirements, a slight negligence or a small will cause the train lost power. The traction power supply system mainly includes two parts: the traction substation and the contact network. The traction substation is the three-phase AC power supply voltage transmission line state grid through reduced to 27500 volts single-phase traction transformer, then send to contact network. Catenary is special railway line along the erection of the train on top of the pantograph can through the friction and sliding contact power and traction train.

 In the Beijing Shanghai high-speed train running process, once found the contact network failure in mechanical vibration, so the 6 before the end of the month make up reinforcement. But not to debug again. After the Beijing Shanghai high speed train opened, unfortunately encountered thunderstorm gale, July 10th after 5 days of continuous failed 5 times, resulting in multiple vehicle half-way stop for a long time. The fault types are: the moment more than 9 class gale makes an additional line offset touch to the roadside steel column grounding short circuit interruption. Lightning can measure the wire contact caused by poor power down the traction transformer, the train lost power.

Two. Serious design flaws signal equipment: WenZhou South Railway Station in the design of signal equipment has serious defect, is the main technical causes of the accident. The signal system of the accident at least two times error: 1, YongJia Railway Station downlink direction near three "occlusion regions" circuit "red band fault", namely all show the non normal state, the red light. Therefore, the dispatcher, YongJia Railway Station and WenZhou South Railway Station by interval are transferred to the "emergency station control mode", that they will be to the dispatcher and combined with artificial operation based operation mode. 2, the lightning the train operation control system ground equipment fuse, at this time should be a red signal. This faulty software should pass through circuit to make before the car behind D3115 into a green light. The expert thinks, a green light is a signal to employees "letter that even", and the red light into green light, but confirmed this point not.

(for the sake of safety, high speed train in the railway system is divided into several segments, called "occlusion regions", general every 2-10 km, our country is short, 1.4 km).

Three. Double safety insurance mechanism is "free": in order to prevent rear end collision, equipped with automatic train protection system and monitoring system, when the train and vehicle distance is less than the safe distance, even if the driver is not in the cab, the train will be automatic emergency braking. Therefore, our experts have repeatedly declared Chinese car is not the collision accident, "did not want to hit". But this time before the accident, D3115 and D301 train in "emergency station control mode", the automatic protection system and operation monitoring system have been playing in the isolated position, did not play a role. The experts is the unexpected.

Four. Human error: (1) the wrong instruction: because "red band fault", D3115 times and D301 times the non normal stop at YongJia Railway Station, and then the dispatcher instruction D3115 starts, and authorized by visual pattern of up to 20 kilometers per hour slowly. After 6 minutes, the instruction D301 time of departure, but unauthorized visual mode, so the driver still according to signal driving. At speeds of 180 km. The front is a green light. After the car drivers found the car taillights, already did not have time to stop. This error is so strange, so some people think that is intentional.

         (2) the provisions of the Ministry of Railways is not executed: the Ministry of Railways safety regulations, in the event of fault signal into the "emergency station control mode", are required by the "station block" management, namely between two stations can only allow one train running. The dispatcher is not the implementation of this provision. Without the D3115 train arrived at WenZhou South Railway Station information, even if the D301 start time.

(3) there are dozens of television screen monitoring between Yongjia and WenZhou South Railway Station, but no one see an exception, as long as 55 seconds after the call before the collision car driver, still can prevent accidents.

After the accident, the railway ministry immediately alert, but take a not very bright attitude, signs of the accident is the reason they are: with the fastest speed to revoke the duties of the Shanghai bureau chief, has not been announced is the lightning accident investigation. Give a person a kind of "natural inevitable" impression. And the intent to shirk responsibility power sector. Then the National Grid announced that power supply system without problems rejected. The Ministry of Railways has not fully investigation, has not obtained the conclusions in the case of fast, clean up the site, open again, in an attempt to reduce the influence of.

 The accident has occurred, to do a good job at the same time, it is important to conscientiously sum up experiences and lessons, to improve our work, will not make the same mistake. Chairman Mao Zedong once said: "afraid afraid of the world to two words. The Communist Party is most seriously "this is our attitude.