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1、1Electrical Equipment and OperationContentsSimple Single Busbar WiringSwitching OperationONThe busbar W mainly plays the role of collecting and distributing electric energy.Simple Single Busbar Wiring3Busbar:It mainly plays the role of collecting,distributing and transmitting electric energy.Groundi
2、ng isolating switch:closed during maintenance to replace the safety grounding wire so as to ensure the safety of personnel.Circuit breaker:used to break or connect the normal operating current,and cut off the short-circuit current in the event of a fault.Isolating switch:to cause an obvious opening
3、for the convenience of maintaining the primary equipment at a power outage.The role of each devicePower 1Power 2Simple Single Busbar Wiring4lThere is only one busbar between the power inlet and the feederlThe power circuit(inlet line)of the generator or transformer is connected to the busbar through
4、 a set of switching devices to collect electric energy to the busbar;lAll outlet wires(feeders)are connected to the busbar by a set of switching devices to output power.Try to distribute the load evenly on the busbar to reduce the transmission of power on the busbar.When the number of inlet and outl
5、et circuits is more than one,in order to adapt to load changes and the needs of equipment maintenance,the lead wire of each circuit can obtain power from any power supply,or when any power supply is cut off,the power supply can still be guaranteed.Use the bus bar to connect the lead circuit and the
6、power circuit.Wiring CharacteristicsPower 1Power 2Simple Single Busbar Wiring5In the power circuit,there is no need to add an isolating switch on the generator side,because the circuit breaker must be checked and repaired in the shutdown state;The installation of the isolating switch on the transfor
7、mer side of the circuit breaker should be determined according to whether the power supply must be isolated after the circuit is powered off.Wiring CharacteristicsPower 1Power 2Simple Single Busbar Wiring6Advantages:(1)Simple and clear wiring,easy to operate,less equipment,one circuit and one circui
8、t breaker,and small investment.(2)The isolating switch is only used for maintenance,not as an operating electrical appliance,and not prone to misoperation.(3)There are few circuit breakers and isolating switches that need to be operated for switching circuits.Disadvantages:(1)When the busbar and bus
9、bar isolating switch are overhauled or faulty,all circuits will be blacked out;(2)When the lead circuit breaker is overhauled,the circuit will be powered off.Analysis of Advantages and DisadvantagesSimple Single Busbar Wiring7Scope of ApplicationDue to the poor reliability and flexibility of single
10、busbar wiring,this wiring is only suitable for small power plants or most box-type substations where there is only one power supply and there are few circuits in the 6-220KV system.Main electrical wiring of terminal substation ContentsSimple Single Busbar WiringSwitching OperationONSwitching Operati
11、on9The State of the DeviceThe electrical equipment of power plants and substations is divided into four states:operation,hot standby,cold standby,and overhaul.The operation of changing the equipment from one state to another is called a switching operation.lOperating state:The state of the device wi
12、th voltage.lHot standby:The state in which the device is live as soon as it is operated.lCold standby:The state where the device is isolated from other live devices.lMaintenance:The state of setting safety measures for the equipment.Switching Operation10lOperating state:The state of the device with
13、voltage.L1 1QS1 1QF QEL2L3L4 1QS2WPower 1Power 2Switching Operation11L1 1QS1 1QF QEL2L3L4 1QS2WPower 1Power 2lHot standby:The state in which the device is live as soon as it is operated.Switching Operation12L1 1QS1 1QF QEL2L3L4 1QS2WPower 1Power 2lCold standby:The state where the device is isolated
14、from other live devices.Switching Operation13L1 1QS1 1QF QEL2L3L4 1QS2WPower 1Power 2lMaintenance:The state of setting safety measures for the equipment.Switching Operation14Ensure that the isolating switch“close first and then break”or operates in an equipotential state lSequence of line power fail
15、ure:off 2QF,off 2QS2,off 2QS1 lSequence of line power on:close 2QS1,close 2QS2,close 2QFIsolating switch“closes first and then breaks”Busbar isolating switch“closes first and then breaks”L1 2QS1 2QF QEL2L3L4 2QS2WPower 1Power 2The operating sequence of the isolating switch and circuit breaker:Switch
16、ing Operation15Ensure that the isolating switch“close first and then break”or operates in an equipotential state lSequence of line power failure:off 2QF,off 2QS2,off 2QS1 lSequence of line power on:close 2QS1,close 2QS2,close 2QFThe operation sequence of the busbar isolating switch and the line isol
17、ating switch:If the circuit breaker is not disconnected,an arc short circuit will occur when the isolating switch of the line side is switched off with load.Because the fault point is on the line side,the relay protection device can automatically trip the circuit breaker to remove the fault point,im
18、posing less impact on the operation of the equipment.When the line is powered,if the disconnecting switch is closed with load,an arc short circuit may also occur.Because the line disconnecting switch is closed later,the fault point is still on the line side.Similarly,the relay protection device can automatically trip the circuit breaker and cut it off,imposing less impact on the operation of other equipment.Thank you for watching!16