Rated voltage:220/380 230/400 240/415
Rated frequency:50/60 Hz
Mechanical Life:10000 Times
Isolating circuit breakers can realize the integrated manufacturing of disconnectors, transformers, and circuit breakers. Through the high integration of primary and secondary equipment, the function combination is realized, saving land and investment. Isolation circuit breakers combine switches and isolation functions in one device, reducing the footprint of the substation and increasing the utilization rate.
The isolation circuit breaker integrates the isolation function with the circuit breaker, eliminating the need to separately install two sets of equipment. This can reduce a considerable area, reduce power loss, improve grid security, and improve system reliability. In addition, this new type of high-voltage isolated circuit breaker is beneficial to optimize the operation and maintenance of the substation and reduce the impact on the environment.
In the isolation circuit breaker, the circuit breaker contact also has the function of an isolation switch when it is in the off position. The contact system is similar to a conventional circuit breaker without the need for additional contacts or connection systems. Isolating circuit breakers use silicone rubber insulators. These insulators are hydrophobic, which means that water on the surface of the insulator will form water droplets. Therefore, this makes the insulator perform well in a polluted environment, and the circuit breaker is in the open position, and the leakage current is minimized.
Isolating circuit breakers can significantly reduce the maintenance of air-insulated switchgear (AIS) substations. After replacing circuit breakers and outdoor disconnectors with isolating circuit breakers in substations, their reliability will also be significantly improved. Isolating circuit breakers must meet the corresponding circuit breaker standards and disconnecting switch standards. The IEC issued a special isolation circuit breaker standard in 2005. An important part of this standard is the combined function test. These tests are used to verify that the isolation characteristics must be met during the use of the isolation circuit breaker, regardless of whether there is wear on the contacts, or whether decomposition by-products are caused by arc extinguishing. To meet these requirements, first verify the breaking and mechanical properties, and then verify the insulation performance.
The design principle of the substation is to “enclose” the circuit breaker with a disconnector so that the circuit breaker can be maintained regularly. Since the number of faults and maintenance of circuit breakers is greatly reduced, the isolation function is more used for overhead lines and power transformer maintenance. Due to the reduced maintenance of circuit breakers and customers’ concerns about the reliability of outdoor isolation switches, some major customers are becoming more and more willing to use isolation circuit breakers. Isolation circuit breakers combine switches and isolation functions in one device, reducing the footprint of the substation and increasing the utilization rate.
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