5 电气设备的选择5.1 电气设备和载流导体选择的原则电气设备选择的一

5 Selection of <br><br>electrical equipment 5.1 Principles of electrical equipment and current-carrying conductor selection General requirements for <br>electrical equipment selection include: <br>(1) It should meet the requirements of normal operation, maintenance, short circuit and overvoltage, and consider the needs of long-term development ; <br>(2) It should be checked according to local environmental conditions; <br>(3) It should strive for advanced technology and reasonable economy; <br>(4) When selecting conductors, the variety should be minimized; <br>(5) The expansion project should try to make the new and old electrical appliances the same type; <br>(6 ) The selected new products should have reliable test data and be officially qualified; <br>(7) Verify thermal stability and dynamic stability according to short-circuit conditions; <br>(8) When calculating the thermal stability of conductors and cables below 110kV, all The calculation time is generally the action time of the main protection plus the corresponding full circuit breaker opening time: and the calculation time of the electrical appliances generally uses the backup protection action time plus the corresponding circuit breaker full division time; The inherent opening time and arc burning of the device. <br><br>5.2 110KV selective side of electrical equipment <br>due to the proposed substation GIS substation, the substation equipment sets must be to meet the technical requirements - enclosed electrical cabinet, it will circuit breaker, disconnecting switches, current transformers, voltage transformers, Lightning arresters, busbars, etc. are combined together according to the wiring requirements to form a high-voltage power distribution device, and filled with SF6 gas as an arc extinguishing medium for insulation and circuit breakers.

5 Choice of electrical equipment<br><br>5.1 Principles for the selection of electrical equipment and current-carrying conductors<br>One-like requirements for the selection of electrical equipment include:<br>(1) should meet the requirements of normal operation, maintenance, short circuit and overvoltage, and consider the needs of the development of the vision;<br>(2) the nuclear shall be carried out in accordance with local environmental conditions;<br>(3) Should strive for technological advanced and economic rationality;<br>(4) The selection of conductors should be to minimize the variety;<br>(5) The expansion project should try to make the new and old electrical models consistent;<br>(6) The new products selected should have reliable test data and be formally certified;<br>(7) Check thermal stability and dynamic stability according to short-circuit conditions;<br>(8) When the calculation conductor and 110kV cable short circuit thermal stability, all calculation time, generally using the main protection of the action time plus the corresponding circuit breaker full split time: the calculation time of electrical appliances generally use backup protection action time plus the corresponding circuit breaker full split time;<br><br>5.2 Selection of 110KV side electrical equipment <br>As the proposed substation for GIS substation, substation equipment must be complete to meet the technical requirements of the fully enclosed combination electrical cabinet, it will circuit breakers, isolation switches, current transformers, voltage transformers, lightning protection, bus, etc. according to the wiring requirements combined in one-start, forming an high-voltage power distribution device, and fill SF6 gas as insulation and circuit breaker arc ingestion media.

5 selection of electrical equipment<br>5.1 principles for selection of electrical equipment and current carrying conductor<br>General requirements for selection of electrical equipment include:<br>(1) It shall meet the requirements of normal operation, maintenance, short circuit and over-voltage, and consider the needs of long-term development;<br>(2) Check according to local environmental conditions;<br>(3) We should strive for advanced technology and economic rationality;<br>(4) When selecting conductors, try to reduce the variety;<br>(5) The expansion project shall try to make the models of new and old electrical appliances consistent;<br>(6) The new products selected shall have reliable test data and pass the formal appraisal;<br>(7) Check the thermal stability and dynamic stability according to the short circuit condition;<br>(8) When checking the short-circuit thermal stability of conductor and cable below 110KV, all the calculation time generally adopts the action time of main protection plus the full opening time of corresponding circuit breaker; while the calculation time of electrical appliances generally adopts the backup protection action time plus the full opening time of corresponding circuit breaker; the full opening time of circuit breaker includes the inherent opening time of circuit breaker and arc combustion.<br>5.2 selection of 110kV side electrical equipment<br>As the proposed substation is a GIS Substation, the equipment used in the substation must be complete set to meet the technical requirements of the fully enclosed combined electrical cabinet. It combines the circuit breaker, disconnector, current transformer, voltage transformer, lightning arrester, bus bar, etc. according to the wiring requirements to form a high-voltage distribution device, and fills SF6 gas as the arc extinguishing medium of the insulation and circuit breaker.