air max 90 Analysis Of The Development An air max

Exclusive Vacuum Circuit Breaker Breaking face very different tasks, and new dedicated breaker came into being. Such as protection for the generator circuit breaker large capacity vacuum circuit breaker (circuit breaking current up to 63 ~ 80kA and above), the standard vacuum circuit breaker (short-circuit breaking current of 25 ~ 50kA), economical vacuum circuit breaker (16 ~ 25kA), frequent vacuum circuit breaker (such as the operating frequency of 5 to 6 million), ultra-frequent type vacuum circuit breaker (such as the operating frequency of 10 to 15 million). Such as Siemens 3AH series of circuit breakers by using the occasion to be divided into five kinds of models, which 3AH1 and 3AH3 form into standard form, the operation 10,000 times, 3AHZ type is frequent type, operating 60 000 times, 3AH4 for the ultra-frequent type, operating 12 million, 3AH5 type is economical and cheap.
2. Low-voltage vacuum circuit breaker Is well known, vacuum circuit breaker closure because closure will cause over-voltage, especially at the beginning of the negative emotional cut off as a small motor [link widoczny dla zalogowanych], the general, and to limit over-voltage vacuum circuit breakers with voltage absorbing device such as Sic? RC Road, ZnO surge arresters, etc., which makes circuit breaker structure of large and complex, and some restrictions on overvoltage is not ideal.
Several companies open up the path of Japan, developed a low-voltage vacuum circuit breaker. It is necessary to increase voltage absorbing device while out of contact with the newly developed materials, over-voltage limit to one-tenth of conventional values. Toshiba low-voltage contact materials for the AgWC Hitachi to Co-Ag-Se [link widoczny dla zalogowanych], Mitsubishi for the Cu-Cr-Bi- , Fuji for the CuCr + high vapor materials. These companies generally do 7.2kV under 20kA, only under the Toshiba do 7.2kV 40kA. Please visit: High pressure Switch Network View More
3. Multifunction vacuum circuit breaker Known? Vacuum breaker so far as the two I-bit (ie [link widoczny dla zalogowanych], unity points) completed the task of the Closing and breaking. There are now multi-functional vacuum circuit breaker, given the number of features, such as joint? Points? Isolation? Grounding. Siemens, Alstom, Hitachi have such products. Siemens latest NXACT type vacuum circuit breaker on a modular multi-function, set off together, breaking, isolation, grounding, and interlock in one. Alstom Company with VISAX vacuum circuit breaker switchgear for the three I-bit (co? Points? Isolation). Hitachi and Tokyo Electric Power Company Cooperation R & D of 24kV vacuum circuit breaker for the four I-bit (co? Points? Isolation? Ground).
To make products with multiple functions, from the existing products of view, there are two ways: First phase column vacuum circuit breaker to open up the rear in the moving or rotating, as isolation and grounding; the other Vacuum Interrupter Complete rotation in contact isolation and grounding. Siemens NXAct products to open up the rear with complete isolation and earth moving column, the Alstom company to open up the rear with separate columns to complete the task rotation, Hitachi interrupter contacts by rotating tasks to complete isolation and grounding.
4. Synchronous circuit breaker Selection phase synchronous circuit breaker called a vacuum breaker or controlled vacuum circuit breakers. The basic principle is to vacuum circuit breaker in the most favorable moment of voltage or current when closing or breaking.
Compared with ordinary vacuum circuit breaker, synchronous circuit breaker has the following advantages: 1. Reduce the transient over-voltage power grid load; 2. Improve the power quality of power supply; 3. Increased life and performance of electrical circuit breakers; 4 . simplifies network design, reducing overall system cost.
ABB companies use digital Electronic Devices and magnetic actuator has been developed synchronous vacuum circuit breaker, this is a good start. <br /

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