The performance of the vacuum switch is closely related to the contact material. The development of any contact material will cause the improvement or improvement of the air switch performance. The improvement of the contact material breaking capacity will not only greatly reduce the size of the vacuum interrupter, but also make The structure of the vacuum switch machine is more compact, saves metal and other materials, and improves the reliability of the vacuum switch. CuCr is currently widely used as a contact material for vacuum circuit breakers. In order to improve the breaking capacity, a high-melting point material is added thereto.
The physical properties of the crucible and copper are shown in Table 1. The properties of crucible can be seen from Table 1. It is difficult to melt into the metal and the powder is not dark gray. It has a high melting point (up to 2 996C), good strength and ductility, low vapor pressure, high thermal conductivity, and atomic weight far greater than that of copper. It also has strong chemical resistance, low brittle transition temperature, and good processability. Its crystal structure is a body-centered cubic structure. It is a vacuum getter again. The comprehensive performance of such superior superiority is not available in many other metals. The addition of niobium to copper chromium not only improves the mechanical strength of the contact material, but also improves its compressive strength.
Earthworms are usually chemically extracted from the potassium salt of the complex salt. The vacuum copper copper required for the production of CuQ2flTa5 is smelted in vacuum, so that both the purity and the copper's performance are improved. The material was prepared in a medium-frequency induction vacuum and the powdery Cu, Cr, and Ti were subjected to a manufacturing process as shown, and a new contact material CuCrTa was manufactured.
Table 33 Comparison of the level of cut-off of the contact material. A 2 Sample introduction The test samples used in the test are shown in Table 2. The contact materials are respectively CuCr25 and CUQ2015CuCr50 vacuum switches. The operating mechanism used is the same. The size of the arc extinguishing chamber is completely the same. The contact structure is all cup-shaped longitudinal magnetism, 4 fingers, and each contact finger accounts for 120 electrical angles. For 4X1/3. Table 2 Details of the test sample Switch code Contact structure Contact material Cup Axial magnetic 4X1/3 3 Cutoff level test Use the circuit shown to measure 100 cutoff values ​​for each vacuum interrupter, used The current is 31. 7A, the contact distance is 8mm, and the opening speed of the switch is 0.8m/s. Medium: T is the transfer coil voltage regulator; C is 0. History F capacitor; RS is the current flow device, The resistance was 18.50m; the SP was a vacuum contactor fitted with a vacuum chamber under test.
Measure the cutoff value. The average value and the maximum value of the cut-off values ​​of the three types of test cut-off values ​​of the vacuum switch can be calculated based on the time ti when the cut-off occurred. It can be seen that the maximum cut-off value of CuCr20Ta5 is lower than that of CuCr25 and CuCr50, and the value of the average shutoff value is also the lowest. The use of CuCr20Ta5 in such a way that the hazard of overvoltage is small, the use will be more secure 4 breaking capacity test on the synthetic loop on the three kinds of samples breaking capacity test. The test circuit diagram is as shown. Medium: K1 is the main closing switch; R1 is the arc resistance; K2 is the arc initiator (2280); K3 is the tested vacuum switch. The limit breaking capacity of each switch is shown in Table 4. It can be seen that CuCr20Ta5 has the ability to maximize the breaking current.
Table 4 Limit breaking capacity of three kinds of test specimens kA Name of the test piece Limit breaking capacity 5 Conclusion Using the same test circuit test, the new contact material CuCr20Ta5 has the following characteristics compared with the commonly used vacuum circuit breaker contacts CuCr25, CuCr. :1 The average intercept value and the maximum intercept value are the smallest; therefore, CuQ2OTa5 is a good contact material for vacuum circuit breakers.
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