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1、1Electrical Equipment and OperationContentsAngular WiringONConcept of Angular Wiring3Wiring StructureClosed into a loop,and segmented by circuit breakers according to the number of circuits,that is,an angular wiring is formed.Wiring CharacteristicsThe number of circuit breakers is equal to the numbe
2、r of circuits,and each circuit is connected to two circuit breakers.Repairing any circuit breaker will not interrupt the power supply.Delta wiring Quadrilateral wiring4Quadrilateral wiringQuadrilateral wiring Lines L1,L2 or power sources T1,T2 are arranged on the opposite angles.This arrangement can
3、 avoid that when a circuit breaker is overhauled,and a certain line fails,there is still one line and one transformer that can continue to work.It improves the reliability of power supply.Hexagonal wiring5Hexagonal wiringHexagonal wiring With the increase of the number of circuit breakers,any circui
4、t breaker maintenance will cause the polygon to become open-loop operation.At this time,any component removal will cause turbulence in the power supply.Angular Wiring6Advantages of angular wiringlEconomy Less equipment:one circuit and one circuit breaker,and without busbar Less floor space:Polygonal
5、 wiring is only about 50%of the medium-sized layout of double busbar with bypass wiringlBetter reliability and flexibility There is no need to power off any circuit breaker for maintenance(but the wiring is open-loop operation)and without busbar.If any section of the wiring is faulty,only the sectio
6、n and its connected components are cut off,which has little impact on the systemDisadvantages of angular wiringlThe number of circuit breakers cannot be too many,and the number of incoming and outgoing circuits is limited(the number of angles generally does not exceed the hexagon)lThe power flow of
7、each branch in open loop and closed loop changes greatly,which makes the protection setting complicatedlThe number of incoming and outgoing lines is relatively fixed,inconvenient for expansion7“When the number of outgoing circuits is small and the prospective scale is relatively clear,polygonal wiri
8、ng can be used.In order to reduce the possibility of open-loop unloading and reduce different open-loop operations,the selection of relay protection is not too complicated.Generally,only quadrangular and pentagonal connections are used.In order to improve reliability,the lines and transformers are c
9、onnected according to the diagonal principle”.Excerpt from Power System Design Manual by Northeast Design InstituteAt present,the small and medium-sized hydropower stations in China use more angular wiringAngular WiringThe scope of application of angular wiring8Angular WiringApplication exampleA schematic diagram of the main electrical wiring of a medium-capacity hydropower station Thank you for watching!9