The development of railway transportation has a history of more than 200 years. With the continuous advancement of technology, the speed of trains has been greatly increased. The improvement and protection of passenger safety is an important issue in railway applications.
In a fast-moving state, how can rail transit electronic equipment ensure and enhance the safety of passengers? Today, the editor will take you to interpret the standard requirements of safety assurance.
The train is in a state of vibration for a long time, resulting in unstable voltage, and it must be able to adapt to environmental differences such as temperature, humidity, shock, vibration, electromagnetic interference, surge, and electrical performance. For this reason, the European Union's research on electronic products for railway applications needs to pass the EN50155 test . The European Union EN50155 standard applies to all control electronic equipment installed on railway rolling stock. It fully considers the operating environment of rail transit vehicles and highlights whether electronic equipment can maintain normal operation under the harsh environmental conditions on railway vehicles. This standard is currently included It is cited by many countries including European countries and is recognized by mainstream rail transit system operators.
EN50155:2017 ------- This European standard was approved by CENELEC on May 8, 2017. CENELEC members must comply with the CEN/CENELEC internal regulations, which stipulate the qualification conditions for national standards that cannot be changed by this European standard.
(Note: CENELEC and CEN and their joint institutions CEN/CENELEC are Europe’s most important standard-setting institutions.)
EN 50155:2017 was prepared by CLC/SC 9XB for "electrical, electronic and electromechanical materials on rolling stock, including related software".
EN 50155:2017 applies to all electronic equipment such as control, regulation, protection, diagnosis, energy supply, etc. installed on rail vehicles.
铁路应用机车车辆电子设备工作温度
EN 50155:2017 stipulates that the design and manufacture of electronic equipment should meet the complete performance specification requirements for the selected temperature class described in Table 1.
The electronic equipment supplier shall specify its power consumption and thermal integration limits (such as natural convection cooling, forced air cooling, cooling plate, installation location, free space in the integrated volume, preheating, air outlet) to ensure the correct integration of electronic equipment To its operating environment.
Users of electronic equipment should comply with the thermal integration constraints specified by the supplier, and should design the integration environment to ensure that the operating temperature meets the operating temperature level of the integrated electronic equipment.
The temperature grades OT1 and OT2 are used in the passenger compartment and the driver's cab. The reference temperature is 25°C, and the effect on the aging of the material is equivalent to the climatic temperature during the lifetime.
The temperature grades OT3 and OT4 are applied to the equipment in the technical cabinet. The reference temperature is 45°C. The effect on the aging of the material is equivalent to the climatic temperature during the life cycle. (Unless otherwise specified, OT3 category is applicable.) The
temperature grades OT5 and OT6 cannot be used as general specifications for vehicle temperature, and can be used for example in semiconductor drive units (SDU) and internal combustion engine control units.
接通延长工作温度
The design should consider the temperature rise in the cabinet to ensure that the components do not exceed their specified temperature ratings. For example, it is expected that the air temperature around a single circuit board will increase by about 15°C (this temperature increase largely depends on the power consumption of the circuit board itself and the power consumption of other circuit boards nearby, depending on natural or Forced airflow, etc.). The design of PBA should take this into consideration, especially when a single PBA plan is horizontally or vertically juxtaposed, or when the subracks containing the PBA overlap.
Suppliers should consider the requirements arising from specific on-board installations (see EN 50155:2017 Annex C).
In some special cases (for example, compartments, the influence of the sun, the auxiliary cooling system is closed), the equipment opened under short-term thermal conditions undergoes additional operational inspections according to the ST1 or ST2 category of Table 2.
Note: "OTx+15°C" corresponds to (the highest temperature of the "OTx" operating temperature range in Table 1) + (15°C), and only applies to "OTx" with "x" = 1, 2, 3 or 4 .
ST1 and ST2 categories are not applicable to OT5 and OT6 categories.
Unless otherwise specified, the requirements of ST1 level apply.
冲击和振动
The product should be able to withstand the vibration and shock that occurs during use without deterioration or failure.
The shock and vibration levels that the product can withstand during normal operation shall be specified. It should be carried out using the categories and grades specified in EN 61373. The supplier shall specify the allowable directions for installing equipment on the vehicle according to the definition of EN 61373.
Unless otherwise specified, the requirements of EN 61373 Class 1 Class B apply.
EN 50155:2017试验类别
The standard stipulates that tests are divided into three categories. When bidding, the user should specify all the trials for which an agreement is reached (see Table 12).
————Type test;
Type test is used to verify that the product meets the specified requirements.
—— Routine test;
Routine test is used to verify that the characteristics of the product are consistent with those measured in the type test under normal environmental conditions. The manufacturer shall conduct routine test for each product.
————Research and experiment.
The purpose of research and testing is to obtain additional information about the performance of electronic equipment that exceeds its specified requirements through testing. They should be specifically requested by the supplier or user, and the contract agreement shall prevail.
Note: The test marked "M" is mandatory.
The test marked "O" is subject to the contractual agreement between the user and the supplier.
The test marked "NA" is not applicable.
Reliability Laboratory is a technical service organization specializing in the testing of electronic and electrical related products, focusing on product performance reliability research and assisting customers in product quality improvement. Professional research has been on the reliability of railway transportation-related electronic equipment for several years, and it has been standardized at home and abroad Full practice has been carried out on the above, such as:
railway applications-rolling stock-electronic equipment ------------------ EN 50155
rail transit rolling stock electronic device ------- ------------- IEC 60571
Rail Transit Locomotive and Rolling Stock Electronic Device ------------------ GB/T 25119
Rail Transit Locomotive and Rolling Stock Equipment Shock and vibration test --------- IEC 61373
rail transit rolling stock equipment shock and vibration test --------- GB/T 21563, etc.
Provide professional testing and test solutions for railway transportation intelligent electronic equipment manufacturers represented by CRRC, Shenzhen Metro, CRRC Times, CRRC Qingdao, Jiangsu Zhongan, etc.; in the intelligent network management control unit, on-board computer, acquisition module, logic We have accumulated rich experience in testing locomotive electronic equipment for railway applications such as control units, industrial Ethernet switches, and subway displays.