4台以上并机方案(英文)

For upto 4 units in parallel , this is exactly like say 2 or 3 units in parallel. Say for 4 x 480 KVA configurations - you will need:DP3480E - 4 unitsParallel Card for DP3480E - 4 units (1 sitting inside each unit) MCCB Box - 4 units (1 for each UPS)Service Bypass for 4 x DP3480E - 1 unit (specify redundant n+1 or full power i.e. whether load is 480 x 3 KVA or 480 x 4 KVA) Electronic Static Switch - Built in every unit (no need to add deperately)The diagram will be exactly same as for 2 or 3 x DP3480E or 4 x DP3480E.For more than 4 units, we shall need an External Static Switch - so the things will change to:Say for 6 x 480 KVADP3480E - 6 unitsParallel Card for DP3480E - 6 units (1 sitting inside each unit) MCCB Box - 6 units (1 for each UPS)Service Bypass for 6 x DP3480E - 1 unit (specify redundant n+1 or full power i.e. whether load is 5 x 480 KVA only or 6 x 480 KVA - in example below it is 5 x 480 KVA)Electronic Static Switch - External to be capable of handling full power of load (say 6 x 480 KVA for full power or 5 x 480 KVA for redundancy - in example below it is 5 x 480)This diagram will look something like:In this option, the load is 5 x 480kV A = 2,400 kV A, which can be handled by 5 UPS modules. The 6th module is parallel operating and sharing the load in redundant operation.Normally on full load operation, each of the 6 UPS active modules is running at 5/6th i.e. about 85% load only.An external Static Switch is used to handle any overloads outside the rating ofOnline Operation or failure of more than 1 module. The Static Switch is rated for 5 x 480 KV A load.A single line drawing is attached below to give an impression of the arrangement.PARALLEL OPERATION OF DP300ESambhaji Wagh APC, SingaporeIn DP300E systems parallel operation works as followsWe can connect upto nine units of same capacity in parallel to achieve redundancy or increased load capacity in UPS system. The configuration will look as follows79Parallel OperationUPS # 9UPS # 6UPS # 7UPS # 8MainsInputCriticalBusQ003Q004Q002ABCDEFGHIQ001ABCDEFGHIExternal StaticBypass SwitchUPS # 4UPS # 1UPS # 2UPS # 3UPS # 5Up to 9 units canbe paralleled byadding theParallel InterfaceBoard andExternal StaticBypass Switch.Internal StaticBypass Switchesof the IndividualUnits are disabledor removed.We have supplied this kind of solution to IBM UK where they have two banksof six units of DP300E in parallel to support their Megacenter.Parallel operation is used with the above shown configuration and works as followsThese parallel units are connected to Service bypass panel to make it easy to combine the UPS power and distribute it to the load. All units get the input through input switches from SBP (Service Bypass Panel) and output of all units will be combined on SBP through individual output switches. This makes it easy to service and maintain the units and increase the reliability of operation.Up to four units can be connected in parallel without any additional external static switch. If the configuration demands more than four unit to be connected in parallel then this configuration uses external static switch for bypass, which is also connected to SBP through switches. For more than four systems the external static switch is used to avoid the imbalance of current on all parallel UPS static switches, because of the different lengths of input and output cables, during the bypass operation of UPSIn order to work in parallel and share the load all units are installed with parallelSilcon DP300E rev 9.0140IBM Megacentre in Portsmouth UKIBM chose Silcon DP300E SystemsIBM 磗 European and Middle East/African organization have put the safetyof their business data in the hands of APC /Silcon-UPS.揑the efficiency of the UPS system is essential.Chris Hayes, UPS ConsultantIT Infrastructure ServicesInstallation:揥e can 抰 affordany drops at allCustomer referencesoperation board inbuilt in a system. This board insures that all units work in synchronization and share the load current equally.Therefore 9 units of DP3480E in parallel can support 4320KV A of total load with each unit carrying the equal current.The configuration of connecting all units in parallel has advantages of high power availability, overload capacity, redundancy in case of load less than full load capacity of 8 units and high reliability as no additional equipment required at the output.SBP is a unit which has only power switches and sense contacts and does not include any electronic components and hence very reliable and makes it easy to maintain and repair the units in future.In order to connect all units in parallel, a parallel cable is connected between all units and this parallel cable also has redundancy (i.e. uses two parallel cables) in order to increase the reliability of parallel operation. Parallel board ensures that all units run in synchronization to keep the same output frequency and phase, it also senses the output current for all units and make it equal on all systems. In parallel operation system also continuously checks how many units are currently active and sharing the load and display it on front panel fr. ex. 3/3 (i.e.3 of 3, all three of parallel systems are on) or 2/3 (i.e. two of three parallel systems are working and one is off). By measuring the total load and checking the number of active system it display on front panel whether the system is operating in parallel or parallel redundant mode.All parallel board signals are electrically isolated from UPS control circuit and hence there will not be possibility of causing any failure in other units if one of unit fails. Many other manufacturers use parallel board where there is no isolation between electrical control signals from one unit to other, in such a situation it can create a fault in other unit because of failure of one unit. Therefore APC’s DP300E series offers very reliable solution for parallel operation as compared to others.。