One: Project background
1: Project background
Rail transit is a symbol of urban development and has close contact with everyone. The reliability and safety of rail transit are the focus of the work of urban traffic management departments. Because of its speed and convenience, it has brought great help to the development and operation of the city. As the power source of subway rail transit, power supply is responsible for the safe and coordinated operation of each subsystem. The traction power of the locomotive, the command center, the control center, and the equipment of each platform are inseparable from the support of power. Once a loop fails Power outages or bus failures may bring outages or even greater secondary disasters to the operation of the entire rail transit. So the feasibility of equipment power supply is self-evident!
2: Development trend
With the development of science and technology, the equipment power supply adopts a static switching dual power supply mode, and there is seamless automatic switching between the two channels. Compared with traditional mechanical switching, its biggest feature is that it is faster and can switch to the normal power supply side within 10 milliseconds. Due to its extreme switching time and millisecond level, the load device will not lose power or restart the device due to switching. Therefore, more and more station control rooms, background systems, video monitoring systems, signal units, ticket checking units, and even power systems are adopting static switching mode to ensure that the load can be switched to the standby emergency power supply side without disturbance in the event of an accident. So as to ensure the safe and efficient operation of the subway.
3: Project application direction
At present, it is designed and configured for the newly-built lines when using dual power supply to switch the infrastructure. Already operating lines, adopt a transformation to improve efficiency, such as the original design where there was only one power supply, need to add a power supply to improve the reliability of power supply; or before using mechanical switching, the load will lose power when switching switching devices. The main feature of the static switching device is to switch the load without power, and the main application direction is the important control system and power system.
Two: Product introduction
1: The basic situation of the product
Our static switching model is ZJ-ATSAC AC dual power switching device, which is an uninterrupted switching device that can realize dual input and single output. The load is an automatic judgment of overvoltage and undervoltage switching system. Which one will be powered first, and which one will work first, and the backup circuit is in the standby state. The two input power supplies are controlled by DSP, and the voltage changes of the two power supplies are monitored in real time, and the switching is realized by the switching of the thyristor. It adopts the switching method of first disconnection and then connection, there is no situation where two input power sources are connected in parallel instantly, and compared with traditional mechanical switching, there is no arc generated during switching, no contact ablation, and life limitation of switching times Disadvantages, so static switching is a reliable and safe device, and the first choice for redundant power supply for key equipment. At present, it has been successfully applied in the energy and chemical industry, communication industry, power grid, etc. The product technology is mature, and the reliability is high. The key switching unit and control unit inside the device are all imported chips.
3: Product performance characteristics
(1) When the switching time is less than 6 milliseconds, the switch is opened or the front-end accidental power failure occurs
(2) Application voltage level AC220, AC380, rated current 10A, maximum 200A
(3) The switchover adopts a static thyristor trigger circuit that is disconnected and then closed, which meets the requirements for switching between mains and between mains and UPS.
(4) Input power supply, output power supply, LED indication of working circuit power supply
(5) When the load current exceeds 150% of the rated current of the device, the switching device will automatically turn off the output and alarm
(6) An alarm is issued when a certain circuit of the input power supply loses power
(7) Manual switching function, which can be switched through the manual switching function key on the panel, which is convenient for maintenance
(8) High-current static switching with bypass maintenance function
(9) The service life of the whole machine is not less than 10 years
Three: Product site and market analysis
1: Existing market product situation
At present, the vast majority of rail transit uses mechanical switching. Although dual redundant power supply is used, the switching is often greater than 100 milliseconds. Due to the limitations of mechanical switching, the switching time cannot be provided. For rail transit control equipment such as computers, PLCs, contactors, relay signals, etc., the equipment will be restarted due to power loss due to switching, resulting in equipment shutdown. Therefore, some important places in rail transit have clearly required the use of dual-redundant non-disturbance switching equipment for power supply.
2: Product advantages
ZJ-ATSAC static switching can meet any load switching and uninterrupted power, using high-power thyristors, the current margin is amplified by more than 5 times, and it can withstand short-term overload and instantaneous overcurrent when the device is turned on. Imported thyristor PN section silicon material has high purity, low conduction internal resistance, low heat generation, and long service life. The secondary control circuit of ZJ-ATSAC switching device adopts transformer isolation and optocoupler trigger circuit, which has strong anti-interference ability and strong suppression of external harmonics. The internal EMC circuit can suppress external electromagnetic radiation.
3: Product application scale
ZJ-ATSAC static switching is mostly used in currents below 100A, using thermal control power supply, CEMS system, engineer station, etc. Such as Guodian Power Plant, Huadian Power Plant, Shenhua Coal-to-Liquid Project, News Broadcasting Station, South-to-North Water Diversion Project, etc.
4: Temporary cost estimate
ZJ-ATSAC380-100A tax-included price: *yuan/set
ZJ-ATSAC380-63A tax-included price: *yuan/set
ZJ-ATSAC380-32A tax-included price: *yuan/set
The above prices do not include on-site installation and commissioning service fees. Generally, factory commissioning parameters leave the factory. On-site installation only needs to be connected to the input power supply and output power according to the diagram.
5: Estimated income
It is immeasurable to improve the security of equipment power supply and reduce the loss caused by sudden power outages.
6: Main competitors
No