Miniature Bearing
Hebei Naimei Bearing is specialized in making a great variety of bearings,such as window bearings,bearings 608,bearings 625.Especially we are professional in manufacturing miniature bearings. Miniature Bearing are versatile, self-retaining bearings with solid outer rings, inner rings and ball and cage assemblies. These products are of simple design, durable in operation and easy to maintain; they are available in single and double row designs and and in open and sealed variants. Due to their low frictional torque, they are suitable for high speeds. They are widely used in: 1) Sliding windows and doors 2) Skateboard, skate 3) Electric motors 4) Washing machine 5) Textile machine 6) Power Tools 7) Pumps
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1 Industry package: 200pcs/plastic bag, 2000pcs /carbon , 50 cartons/pallet ,
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Miniature Bearing,Miniature Skateboard Bearing,Mini Ball Bearing,Small Bearing Hebei Naimei Bearing Co., Ltd. , https://www.nmn-bearing.com
Microcomputer relay protection tester is a new type of intelligent test instrument. The former relay protection test tool is mainly composed of a combination of a voltage regulator and a phase shifter. It is bulky and inaccurate, and it cannot meet the requirements of modern microcomputer relay protection. Verification work. With the continuous development of science and technology, microcomputer relay protection has been widely used in line protection, main transformer differential protection, excitation control and other fields, integrated automation of substations has become the mainstream.
Modern microcomputer relay protection tester can be divided into two forms, one is the use of traditional OCL power amplifier, large size, weight of about 25Kg, more cumbersome, power amplifier work in the amplification area, a long time and easy to damage, and dynamic range Narrow, accuracy is not high. The other is the use of switching power supply, power amplifier using digital amplifier, small size, light weight, high efficiency, is the relay protection tester development direction. Various types of voltage, current, frequency, power, impedance, harmonics, differential, synchronous and other relays can be tested manually or automatically. Simulate various types of faults and perform distance setting and zero-sequence protection device setting verification and protection. The entire set of tests of the device can automatically scan the differential braking ratio of the microcomputer and the digital transformer, and the generator-transformer group, and have a GPS trigger function.
The microcomputer protection relay test system (eg DF-702, DF802, DF1200) produced by DBF is based on the DL/T624-1997 "Technical Condition of Microcomputer Relay Protection Test Device" issued by the Ministry of Electric Power. Listening to the opinions of users, summarizing the advantages and disadvantages of similar domestic products, and using a modern miniaturized microelectronics technology and devices to realize a new type of miniaturized microcomputer relay protection tester. It uses stand-alone operation, can also connect the advanced structure of notebook computers. Host adopts DSP+FPGA structure, true 16-bit DAC output, built-in new modular high-fidelity linear high-power amplifier, comes with 8.4-inch TFT true color display with 800×600 resolution and high-grade industrial keyboard and mouse. WindowsXP operating system, powerful. Small size and high precision. It not only has the superior performance and advanced functions of a large-scale tester, but also has the advantages of compactness, flexibility, ease of operation, and high reliability. It is a good tool for protecting workers.
The WKJBC-II stand-alone relay protection calibrator produced by DBF is a new generation of calibration device successfully developed by our company. The internal AC and DC voltage and current sources of the instrument adopt the latest power supply technology, which makes the instrument reach the domestic advanced level in circuit design, device selection, panel layout and internal structure design. The instrument has the advantages of perfect function, excellent material selection, clear test data, simple operation, etc. It is the preferred equipment for the power protection department.
The DF1200 automatic relay protection calibrator produced by DFG is based on the original JBC, and is a newly developed intelligent, multi-function relay protection calibration instrument. The instrument uses a single-chip microcomputer technology, from the automatic synchronous digital millisecond watch, logic control unit, multi-function digital display unit, high-precision data acquisition and processing unit, current and voltage output unit, overload and over-range protection unit, etc. With printing and display, the test process is automatic, greatly improving the measurement accuracy and work efficiency. The instrument also has the advantages of beautiful appearance, reliable performance, easy operation and complete functions, etc. It is an ideal instrument for verifying relay protection devices.
Second, the use environment of the microcomputer relay protection tester is mainly divided into three aspects:
1, hardware requirements, the PC configuration requirements are not very high, at least for Pentium200 above, 32M memory, display resolution 800 × 600 or more, can run Windows98 operating system, laptop or desktop computer.
2. For the hardware connection, the PC power supply and tester should be turned off, and the PC serial port 1 should be connected to the PC communicator on the back panel of the tester with a 9-pin communication cable. Then turn on the power of the tester and the PC. And select the “PC†menu on the tester offline software main menu to enter the PC communication status.
3, the software operation, start the PC, run the current operating system, it is best to set the display resolution of 800 × 600, open the target folder on the desktop, enter the various sub-function menu to conduct the test.
Third, microcomputer relay protection tester USB communication troubleshooting
Microcomputer relay protection tester adopts high-speed USB2.0 protocol for test communication. Before testing, it must confirm that the USB connection is normal. If the status bar of the test software interface always shows that the device is not connected, you can follow the steps below to troubleshoot the problem:
1. The microcomputer relay protection tester confirms whether the USB control switch on the instrument panel is selected correctly.
USB control switch selection is selected according to different test methods. If the test is connected to the built-in IPC to do the test, then the USB control switch will be selected as the “IPC†terminal; if it is connected to an external computer for testing, select the “PC†terminal.
Note When connecting an external computer, check whether the IPC driver is installed. For details, see Appendix A.
Then check the status bar of the test software interface. If the display device is still not connected, go to the next step.
2. Attempt to press the reset button on the instrument interface.
Wait 5 seconds and check the status bar of the test software interface. If the display device is still not connected, go to the next step.
3, shut down the system normally, and turn off the power, waiting for a few minutes and then boot.
Fourth, the use of microcomputer relay protection tester
The microcomputer type relay protection test device is an important test tool for ensuring the safe and reliable operation of the power system. With the rapid development of computer technology, microelectronics, and power electronics, it is an inevitable trend for technological progress to continuously introduce new high-performance microcomputer relay protection test devices using the latest technological achievements. The relay protection test device is an important test tool for ensuring the safe and reliable operation of the power system. As the size of modern power systems continues to expand and the reliability and efficiency requirements for power system operation and management continue to increase, the testing work of relay protection personnel becomes more frequent and complex. With the rapid development of computer technology, microelectronic technology, and power electronics technology, the application of the latest technological achievements to continuously introduce new high-performance relay protection testers is an inevitable trend of technological progress, and it is also the responsibility entrusted to us by the times.
V. The Electrical Appliance Microcomputer Relay Protection Tester has the following broad applications:
1. Testing of all single components in the secondary dispatch (current, voltage, time, differential, balance, negative sequence, distance, power direction, inverse time, frequency, synchronization, reclosing and other relays).
2. The entire group of transmissions can simulate a variety of simple or complex transient, permanent, and conversion failures, and can superimpose transient DC components on the fundamental wave.
3. The harmonics can be superimposed randomly, and the superposition initial angle and content can be controlled online.
4, can be divided into the output of different frequency AC, AC and DC.
5, dedicated low-cycle unit, can easily test low-voltage low-voltage load protection microcomputer protection.
6. Automatic scanning of various protection time characteristics. Scanning of power and impedance protection characteristic curves.
7. Automatic testing of differential ratio and harmonic braking characteristics of microcomputer main transformer protection.
8, the whole group distance, zero sequence, over-current protection automatic test.
9, user-programmable test unit to meet special test purposes, self-test device self test.
10, the motor demagnetization out of step, anti-excitation, reverse power and the same period and other protection tests.
(ABEC-1,ABEC3,ABEC5,ABEC7,ABEC9)
2 Tube Package: 10PCS/tube,then put in Carton and Pallet
3 Single Package: 1PC/single box, then put in Carton and Pallet
And also we can pack according to your requirement.
I. Overview and Features of Microcomputer Relay Protection Tester
Product name
Miniature Bearings
Material
Carbon steel, Bearing Steel, stainless steel
Size
8X22X7mm,5X16X5mm,6X19X6mm,7X22X7mm...
Number of row
Single row
Cage material
Steel, Nylon, Brass
Precision
P0, P6, P5, P4, P2
Vibration and noise
Z1V1,Z2V2,Z3V3,Z3V3
Applications
Home applicance, electric tools, motors, textile machine and so on