Application of gas flow sensor in “Harmony” series electric locomotives
chrispeng [ad_1]
In order to reliably and timely monitor the internal ventilation of the traction converter cabinet and auxiliary converter cabinet of the electric locomotive, CNR Datong Electric Locomotive Co., Ltd. chose Turck’s M18 shape analog output gas flow sensor product. With excellent temperature gradient characteristics and a higher response sensitivity than ordinary thermal flow sensors specially designed for gas flow detection, even in environments with drastic temperature changes and large fluctuations in flow rate, the M18 shape analog output gas Type flow sensor products can also accomplish the monitoring task excellently.
business background
China CNR Datong Electric Locomotive Co., Ltd. was established in 2003 and is an important base for R&D and manufacturing of electric locomotives in my country. In 2007, the company introduced the technology of Alstom (France), and jointly designed and produced the “Harmony D2” high-power AC drive electric locomotive, which represents the highest configuration of domestic AC drive electric locomotives and also has the international advanced level.
“Harmony D2” electric locomotive (also known as “HXD2 electric locomotive”) is an eight-axle high-power AC drive freight locomotive developed on the basis of Alstom’s PRIMABB43700 electric locomotive. The locomotive adopts microcomputer network control, standardized and modular design; it has a wide range of constant power, large shaft power, good adhesion characteristics, high power factor, low harmonic interference, low maintenance rate and full life cycle, low operating cost, and wide application range And other advantages, it is one of the important symbol products of China’s railway equipment technology modernization.
client needs
“Harmony” series freight electric locomotives are all high-power AC drive locomotives, powered by inverters. The locomotives and EMUs use AC asynchronous motors as traction power. Taking the “Harmony D2” electric locomotive as an example, basically every type of “Harmony” series freight electric locomotive will be equipped with a traction converter cabinet (main converter cabinet) and two independent auxiliary converter cabinets.
Among them, the traction drive system of the entire locomotive is installed in the traction converter cabinet, and each motor converter individually supplies power to each traction motor. Therefore, the power part of the entire locomotive and the traction converter cabinet are inseparable, which is inseparable for the normal operation of the locomotive. Operation plays a vital role.
The two auxiliary converter cabinets mainly supply power to auxiliary equipment such as cooling tower fans, traction fans, water pumps, oil pumps, air conditioners and main compressors, battery chargers, heaters, etc., using a redundant working method of one use and one backup; and Compared with the traction converter cabinet, although the auxiliary converter cabinet supplies power to auxiliary equipment, its importance cannot be ignored. The normal operation of the converter cabinet is also related to the smooth operation of the entire locomotive.
In order to monitor the internal ventilation of the converter cabinet in real time and ensure the normal operation of the converter cabinet, each converter cabinet is equipped with 2 TURCK M18-shaped analog output gas flow sensors (under the left and right fans in the cabinet) One for each), see the following figure for the specific installation location:
The main and auxiliary converter cabinets run uninterruptedly for a long time, fully guaranteed by the TURCK gas flow sensor
Before using TURCK gas flow sensors, customers have also used other brands of flow sensors, but due to frequent changes in the internal temperature of the cabinet, the sensor lacks an effective temperature mutation compensation feedback circuit; the sensitivity is too low and the response time is slow; simulation The unsatisfactory volume output curve and other reasons have seriously affected the normal operation of the entire locomotive, and also brought a lot of trouble to the customer’s debugging work, which greatly reduced the production efficiency. In the course of use, due to low sensitivity and serious delay, it is often necessary to manually hold the wind speed detection instrument to detect the internal ventilation of the cabinet; at the same time, because special products such as freight electric locomotives often need to run for a long time, this makes the cabinet The temperature change inside the body is obvious. For ordinary thermal flow switches, due to the particularity of the working principle, this change will directly cause the output curve to be unsatisfactory, and the linearity is poor, which leads to the failure of detection. At the same time, the installation space is narrow and the wiring space is insufficient. The sensors of other brands previously used by customers cannot fully meet the needs of the application.
TURCK solution
In response to the above requirements and working conditions, TURCK’s technical staff recommended the threaded cylindrical analog output gas flow sensor product: FCS-M18-LIX after in-depth on-site exchanges, which satisfactorily solved the user’s problem. Due to the special working principle of the thermal flow sensor, it is susceptible to sudden changes in temperature, which can easily cause detection failure; while the TURCK gas flow sensor has a special probe structure and an internal effective closed-loop negative feedback control circuit to achieve The influence of the sudden change in temperature is basically offset, and the application problem of the thermal flow sensor is fundamentally solved. In addition, the flow sensor specially designed for gas flow detection has higher sensitivity than ordinary thermal flow sensors, and can accurately detect gases with insignificant heat changes, so as to better meet the needs of users.
FCS-M18-LIX is also one of the TURCK gas flow sensor series products. Its 200K/min temperature gradient can be well adapted to the environment with sudden temperature changes on site, thereby avoiding unstable output and reducing maintenance time. Improve work efficiency; the detection element part specially designed for gas can well monitor the ventilation situation in the converter cabinet, which not only avoids manual duplication of labor, but also ensures the accuracy and timeliness of the linear output of the analog quantity; At the same time, its integrated design and small and compact product shape also bring great freedom to customers in installation. With the above advantages, the performance of the entire locomotive has also been correspondingly improved, which can well meet the needs of increasingly rapid and efficient railway transportation development.
TURCK sensor provides reliable guarantee for the safe operation of electric locomotives
On high-power AC drive locomotives similar to those produced by CNR Datong Electric Locomotive, including the main equipment traction motors and cooling tower fans, traction fans, water pumps, oil pumps, air conditioners and other auxiliary equipment, its long-term uninterrupted operation is safe Performance and reliability are the top priority. This is reflected in every detail of the entire locomotive, especially the main and auxiliary converter cabinets that provide power to all equipment. Its reliability is particularly important. The successful application of TURCK gas flow sensor in the converter cabinet has fully improved the reliability of electric locomotive operation and brought convenience to customers.
First of all, the TURCK gas flow sensor has a rich product sequence that can meet the requirements of customers in different forms; in addition, its highly adjustable sensitivity characteristics for gas research and development enable even small flow changes in the air volume in the converter cabinet. It is sensed by sensors to ensure driving safety.
Secondly, the TURCK gas flow sensor is also a member of the TURCK thermal flow sensor family, and it also has excellent resistance to temperature mutations. During the uninterrupted operation of electric locomotives, the ambient temperature is ever-changing, and it is inevitable that there will be sudden temperature changes. Especially for thermal flow sensors, it is a relatively big test. TURCK thermal flow sensors rely on their special probes. The structure and internal compensation circuit can completely minimize the impact of sudden temperature changes, thereby ensuring the stability of the analog output, and then achieving the successful monitoring of the air volume in the converter cabinet, ensuring the smooth operation of the electric locomotive for a long time.
Finally, the TURCK M18 gas flow sensor has a small appearance and a compact structure. It integrates the detection element and the processing circuit. Its volume is only equivalent to a flow sensor probe, especially for limited installation space or not suitable for installing a split flow switch. For different applications, it can have a lot of application freedom.
The “Harmony D2” type high-power AC drive electric locomotive represents the highest configuration of domestic AC drive electric locomotives and also has the international advanced level.
Excellent performance gas flow sensors are widely used in electrical cabinets and air flow monitoring in ventilation ducts
[ad_2]
