The main circuit breaker is an important electrical component of the electric locomotive. Its role is to pass and break the high-voltage circuit of the electric locomotive. It is the main protection device on the locomotive. When the main circuit is short-circuited, grounded, rectified arm breakdown, and traction motor ring fire When the auxiliary motor malfunctions, the locomotive automatically cuts off the power supply of the locomotive, and can also manually control the opening and closing of the main breaker. It can be said that the operation performance of the main breaker is particularly important.
TDVB*10/25 type air circuit breaker Currently, in the SS4 modified electric locomotive to which the Harbin locomotive section is assigned, the main breaker is installed with a TDVB*300/25 type vacuum main breaker (hereinafter referred to as TDVB type) and TDZIA*10/25. Types of air circuit breakers (hereinafter abbreviated as TDZIA type), in the course of more than 2 years of use, TDZIA main circuit breakers exposed a lot of problems, mainly in the following two areas: burst February 2002 ~ 2004 In February, the total number of air circuit breaker porcelain jars burst 10 times, and these 10 cracks occurred in the coldest part of the winter (there are few occurrences in the southern department of civil affairs). One of the most important reasons for the explosion caused by investigation and analysis was the temperature. Too low, so the TDZIA type main circuit breaker is not suitable for use in cold northern regions.
Repair the air circuit breaker to dismantle and check the interior of the arc extinguishing chamber and the static and dynamic contacts during the double minor repair of the locomotive, and replace the over limit contact. During minor repairs, disassemble the non-linear resistors and dry the non-linear resistors. Frequent disassembly and assembly of air circuit breakers increases labor intensity, main circuit breaker failure rate, and maintenance costs.
The comparison of two types of main circuit breakers and TDVB type vacuum main circuit breakers is a kind of vacuum circuit breaker developed on the basis of the mature operation mechanism of TDZIA type air circuit breakers using vacuum arc extinguishing technology.
As a new type of product, he has been widely used in China's new electric locomotives because of its superiority.
The advantages of the TDVB type vacuum main circuit breaker are compared with those of the TDZIA type air circuit breaker in terms of structure, principle and maintenance.
(1) Structure TDVB type and TDZIA type are also composed of high pressure and low pressure in the same structure. The low pressure part consists of cylinder, main valve, starting valve, time delay valve, transmission air cylinder, and closing electromagnet. In the TDVB type high-pressure points using vacuum arc extinguishing, cancel the nonlinear resistance, while the arc extinguishing chamber is a non-detachable integrated structure, simplified in the overall structure, reducing the number of disassembly process.
2) Principle of operation The principle of closing the two types of main circuit breakers is the same only if the principle of opening is different.
When the TDVB type is in the closing state and needs to open, the opening signal in the control circuit passes through the normally open contact of the auxiliary switch, so that the coil of the sub-gate solenoid is energized, and the collision block hits the sub valve stem, and the compressed air passes through the supporting porcelain bottle. The inner hole quickly enters the drive cylinder in the extinguishing chamber assembly, and the piston is moved to drive the vacuum switch pipe to move the contact and break. At the same time, the compressed air enters the delay valve, enters the transmission air cylinder after delay, pushes the piston, rotates the rotating porcelain bottle by 70°, and opens the isolation switch blade. After the dynamic and static contact of the vacuum switch tube is broken, it is returned under the action of the spring. Contact with the static contact to complete the entire opening process. Breaking of the TDVB type static and dynamic contacts is performed in a completely vacuum environment and does not require the use of compressed air for arc extinguishing and cooling. The TDZIA type main circuit breaker uses compressed air to separate the moving and static contacts. At the same time, the compressed air forms a high-speed airflow at the nozzle outlet, which strongly blows the arc generated when the moving and static contacts separate. cool down. Therefore, the arc extinguisher porcelain bottle is subjected to high temperature and high pressure for a long period of time. In the long term, it will inevitably lead to a change in the strength of the material. When the external environment temperature is low, the temperature difference between inside and outside is large, and it is easy to cause the porcelain bottle burst.
3) Maintenance Maintenance of TDZIA type main circuit breaker includes: maintaining clean air path, draining timing of storage tank; regular replacement of rubber parts; regular inspection of main contact overtravel, contact recovery spring state and other major parts of the technology State; regular replacement of desiccant in non-linear resistors to detect the resistance value of non-linear resistors; proper adjustment of the buffer of the drive cylinder to ensure good isolation switch opening action; regular detection of the accuracy between the piston and the cylinder, Through trimming or replacement of parts to ensure its good performance; Determination of the main circuit breaker's inherent trip time, should be less than 30ms, the delay time is 35~55ms; the minimum disconnect pressure is not greater than 350KP As TDVB-type canceled TDZIA type of nonlinear resistance part, so the maintenance of TDVB type main circuit breaker includes: periodic inspection and cleaning of arc extinguishing chamber, the outer surface of the insulator is cleaned once every month; check whether the fasteners are loose, whether the soft connection is Intact; Lubricating grease on each sliding part; Check whether there is rubber in the cushioning pad; Rated open distance adjustment value is 18mm. In daily maintenance Because the arc extinguishing chamber of the TDVB type main circuit breaker is a non-removable integrated structure, the nonlinear resistance is cancelled. Therefore, the dynamic and static contact (down on page 21) of the pipe network flow monitoring pipe network pressure monitoring water tower water level monitoring clearing pool water Before the monitoring center station pump starts, add water for 5 minutes (solenoid valve control) Real-time database configuration Historical data and report data configuration Graphical configuration trend display report configuration control and algorithm, sequence control configuration substation management configuration 3.24 sub-station management and sub-station configuration functions on-site signal acquisition, conversion and processing ladder diagram and implementation of the algorithm to achieve the pump outlet pressure measurement pump outlet flow measurement water level measurement (net tank, water tower, 4 wells) motor Voltage Measurement Motor Current Measurement Field to Pump Motor Power Manually Automatically Switch PLC Data Acquisition, Management, and Control Frequency Converter 4 Main Control Platform Software Design and Principles Industrial automation software for data acquisition, visualization, and process monitoring functions.
The software is a Chinese-language Chinese interface, friendly and convenient man-machine interface, powerful configuration functions, through the software can be real-time, comprehensive reflection of the parameters of the wells, inverter parameters, can easily complete the water level of the wells automatic testing.
4.1 Principles of software design Software design follows the principles of life cycle method and object-oriented component technology and methods, and absorbs experience in the development of configuration software and information management software at home and abroad, and fully considers the actual needs of users in the segment. In the process of decomposition design of each component (or module), the specific principle of high-cohesion and low-coupling should be followed, and the same process flow must be merged. The same process flow should be followed. The principle of the separation of different types of information is independent of the principle of the organization. Moderate principle of tailoring The principle of highly software reuse establishes a structured program system, realizes the optimization of the overall software system (up to page 17), and the transmission is a maintenance-free part, thereby greatly reducing maintenance workload and maintenance costs. It also reduces the main circuit breaker failure rate.
(4) The superiority of TDVB type main circuit breakers has also been confirmed in practical use.
The failure rate of locomotives with TDVB-type main circuit breakers is very low. In a one-and-a-half year period, only one small fault occurred, while the TDZIA type has an average of five faults in more than two years. /station.
The software system of Harbin Railway Science and Design and the design of practical principles, open principles, timeliness principles, and optimization principles should be open to adapt to internal and external environmental changes and to adapt to the development and expansion of the system. System design should adhere to the principles of unification, standardization, and standardization, and achieve unified software, modular structure, program structure, standardized data formats, unified code, and standardized documentation.
4.2 The main functions of the software system Real-time data management provides a fast and efficient place for data information, and records real-time data of the running process. The real-time data management system is established on the basis of computer memory and computer communication, monitoring and management, providing historical data files, and storing various process data to facilitate understanding of historical situations.
Data Acquisition For data terminal equipment, PLC devices, etc., use 9S232, 9S485 bus or wireless communication for data acquisition, data collection according to the configuration table. The collected data is processed by data, converted into a format that the system can recognize, and the data is stored in a real-time database system.
Print function: alarm and status print, print screen, such as trend chart, for analysis, substation water output, total water output display and on-site parameter display printing, daily, monthly, annual report summary, comparative analysis and printing.
5 Selection of equipment With the development of railway modernization, the requirements for the construction of large-scale water supply automation control systems are increasingly pressing. In the past ten years, through the joint efforts of technical experts from various countries in the world, many testing equipment, transmission equipment and control equipment have been successfully developed. Our automatic control system adopts advanced equipment both at home and abroad in the selection.
Antennas: The main station uses ECCOM omni-directional antennas, substations use ECCOM Yagi directional antenna arresters: ECCOM LP-2B arrester pressure transmitter: Germany Siemens electromagnetic flowmeter: Shanghai Guanghua LDG-S deep well liquid level transmitter : Germany Siemens PLC Siemens S7-200 programmable controller Inverter: Germany Siemens In addition to the design of the above equipment, the system should also pay special attention to the configuration of the system power supply device, due to more system equipment, power demand Large, there are many types of power supply, and to ensure the system's online work, the power supply design and configuration should have sufficient margin and safety factor. In addition, most of the communication equipment is installed outdoors. The main power supply is mainly supplemented by alternating current and direct current. Special attention should be paid to the correct installation and use of lightning protection systems to avoid lightning strikes and personnel injuries.
4 Conclusions With the rapid development of the social economy and the continuous increase in the speed of trains, safety and punctuality are particularly important. This requires that the failure rate of locomotives serving as traction tasks for trains is low. The main circuit breaker is an important component of the locomotive. The importance of the main circuit breaker cannot be ignored. Its online fault will cause the machine to break, causing the train to be late and eventually causing economic losses and adverse social impact. The above discussion proves that the TD-VB-300/25 vacuum main circuit breaker is applicable to the electric locomotives of China's northern railways.
Return
The Shackles (both body and pin) WinnerLifting provides are made of high strength alloy steel through advanced production line and intermediate frequency furnace heat treatment.They have the advantage of high-intensity,light weight,nice appearance as well as good toughness.
And yet,all these US type shackles,including there screw pins and bodys meet the requirements of federal specification RR-C271D type IVB,grade A,class 2.
In a word,you can find quite good shackles here!Contact us for more!
Galvanized Shackles,Us Type Chain Shackle,Us Type Anchor Shackle,Bolt Type Anchor Shackle
WINNERLIFTING SAFETY EQUIPMENT CO.,LTD. , https://www.winnerlifting.com