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UPS sizing rev UPS Sizing

3 List of contents AC Load Specification Required information Examples... Task 1... Task 2... Task 3... Task 4... Task 5... Review Head lines

UPS sizing rev AC Load Specification Required information Examples... Task 1... Task 2... Task 3... Task 4... Task 5... Review Head lines AC load spec.

UPS sizing rev The complete AC load specification includes: AC Load Specification UPS load specifications Example kVA….……17 kW……..…... I load …………… PF…….….0,8 CF……..…3,5 kVA:Apparent power load (S) - kVA kW:True power load (P) - kW I load :Phase current, I L1, I L2, I L3 - on load PF:Power factor CF:Crest factor AC load spec.

UPS sizing rev DP300E output specification Product range... UPS load specifications: VA…………….? W……………...? I load ………...…? PF…………….? CF…………….? DP300E output specifications: kVA…… kW…..… I out …...14, A Pf inductive load …...0,8 Pf capacitive load …..0,9 PF SMPS.. …0,6 - 1,0 CF……Unlimited DP310E - DP3480EUPS load ? AC load spec.

UPS sizing rev Load power - kVA and kW Apparent load UPS load specifications kVA……………. kW……………. Iload……….…… PF………...….. CF……...……. AC load spec. kW kVA = PF kW = kVA x PF True load P = I x V x PF

UPS sizing rev Load phase current - I L1, I L2, I L3 The max phase current is the highest possible load current from one phase This value is very important when sizing the UPS UPS load specifications kVA…..…….. kW……..…… I load …………… PF………….. CF…………. I L1, I L2, I L3, find max I Load Max load phase current I load1 I load2 I load3 AC load spec.

UPS sizing rev Power factor - PF W PF = VA  Indicate the PF load working area when quoting to avoid later mistakes  Please consult APC if the load PF is outside the Silcon DP300E series specifications AC load spec. UPS load specifications kVA……………. kW……………. I load ……….…… PF………...….. CF……...……. Power factor is defined as “True power” divided by “Apparent power” DP300E output capability: PF inductive load ………0,8 PF capacitive load ……..0,9 PF SMPS ……………0,6 - 1,0

UPS sizing rev Crest factor - CF I peak CF = I RMS Silcon DP300E series has a CF limiting feature which ensures that a load specified with a high CF will be limited to approximately a value of 3 - and the inverter will cope with this without derating The consequence of above is that you can... AC load spec. UPS load specifications kVA……………. kW……………. I load ……….…… PF………...….. CF……...…….

UPS sizing rev Required information... AC Load Specification Required information Examples... Task 1... Task 2... Task 3... Task 4... Task 5... Review Head lines Required info.

UPS sizing rev Let´s make it... Step By Step Required info.

UPS sizing rev Required load information - finding the right UPS size... Required info. What is the right DP300E UPS size…? kVA/ kW ! Max phase current Max phase kVA load or Max total kVA load at symmetrical load Max kW load and PF one of these...

UPS sizing rev When max load current is specified...  The Silcon DP300E series output capability is always specified at unity PF  The highest phase current therefore determines the UPS size  Do the following if the max. load current is included in the customers specification: LOAD: Max specified current: 3 x I load max > DP300E - UPS: Full load output current 3 x I out max For 3-phase systems the current from the phase with the biggest load has to be used. Required info. 1

UPS sizing rev Max. kVA load and PF specified For 3-phase systems: - multiply highest loaded phase by 3  By symmetrical load, use the total kVA load  By unsymmetrical load, use the highest phase kVA load. LOAD: Max specified kVA: S VA max > DP300E - UPS: Output power S out max Required info. 2

UPS sizing rev Max. kW load only specified... You need to know both kW and PF...  The kW as the only load specification is not sufficient information - unless the PF is unity ! LOAD: > Required info. kW kVA = PF DP300E - UPS: Output power S out max 3

UPS sizing rev Inrush Current Equipment Inrush current /nom current Duration Power Factor normal service Computer CPU 6 to 10 2 to 8 cyclesind. 0,8 - 0,9 Computer Peripherals (printers etc.) - old computers 4 to 8 1 to 15 sec.0,8 - 0,9 Incandescent lights 6 to 18 2 to 8 cycles0,9 - 1,0 Motors 4 to 8 1 to 15 sec.0,7 - 0,8 Battery chargers 6 to 10 2 cycles0,6 - 0,8 Unregulated DC power supply 6 to 10 2 cycles0,7 - 0,8 Transformer 6 to 10 2 cyclessame as load Required info. Computer Peripherals (printers etc.) - modern computers 3 to 6 1 to 10 sec.0,9 - 1,0

UPS sizing rev Example 1... AC Load Specification Required information Examples... Task 1... Task 2... Task 3... Task 4... Task 5... Review Head lines Example...

UPS sizing rev Example 1... Power sizing the UPS... kVA-load Power factor on mixed loads 60 kVA/ kW PF =1 60 kVA/ 48 kW PF = 0.8 Legacy UPS system ? 60 kVA UPS size = kVA load Load 1: (8 kW / 0,8) = …..…….. 10 kVA Load 2: (18 kW / 0,9) = ………. 20 kVA Load 3: (30 kW / 1) = ……..… kVA Sum of loads… kW…….……..……. 60 kVA Sum of loads… kW…….……..……. 60 kVA ? 70 kVA/ 56 kW PF = 0,8 Legacy UPS system ? 70kVA UPS size = kVA and kW load Example...

UPS sizing rev Example 2... Power sizing the UPS... kW-load Load 1: = …………..…..….. 10 kW Load 2: =…………..………. 20 kW Load 3: = ………..……..….. 30 kW Sum of loads…………………………. 60 kW Sum of loads…………………………. 60 kW 60 kVA/ kW PF =1 75 kVA/ 60 kW PF = 0,8 Legacy UPS system ? 75kVA 60 kVA UPS load = Loads/ PF (0.8) UPS load = Loads/ PF (1) Power factor on loads = 1 Example...

UPS sizing rev Silcon DP300E - Power sizing the UPS Power sizing the DP300E UPS  Calculate the UPS-load in kVA  Define highest phase load  Choose the DP300E having its full load output power equal to - or bigger than the load Additional considerations.. Overload capacity Redundancy ……. - see the Power Binder for further details Additional considerations.. Overload capacity Redundancy ……. - see the Power Binder for further details

UPS sizing rev Now - your turn...

UPS sizing rev Task 1 AC Load Specification Required information Examples... Task 1... Task 2... Task 3... Task 4... Task 5... Review Head lines Task 1

UPS sizing rev Task 1 - Specify the UPS Supply voltage…….3x400V - 50Hz Supply current…….3x36A Power Factor……….PF= 0,8 Crest Factor………...CF 3,2 Load specifications: Task 1

UPS sizing rev Silcon DP340E Comments Ignore the PF and CF values In the Spec. Sheet /Quick Reference is found that: A Silcon DP320E has I out 1/1 = 3 x 29A A Silcon DP340E has I out 1/1 = 3 x 57,7A A Silcon DP320E is to small ! Task 1 - Solution Solution: Load specifications: Supply voltage…….3x400V - 50Hz Supply current…….3x36A Power Factor……….PF= 0,8 Crest Factor………...CF 3,2 Task 1

UPS sizing rev Task 2 AC Load Specification Required information Examples... Task 1... Task 2... Task 3... Task 4... Task 5... Review Head lines Task 2

UPS sizing rev Task 2 - Specify the UPS Supply voltage….….3x400V - 50Hz Phase current: I L1 ……………….12A PF 0,9 CF 2,7 I L2 ……………….18A PF 0,8 CF 2,9 I L3 ……………….17A PF 0,8 CF 3,0 Load specifications: Task 2

UPS sizing rev Solution: Silcon DP320E Comments: Ignore the PF and CF values Take the highest phase current and compare it with the full load output currents listed in the data sheets Silcon DP310E has a full load output current of 3 x 14,5A I L2 requires 18A - so DP310E is not sufficient A Silcon DP320E has to be used. Task 2 - Solution Solution: Task 2 Load specifications Supply voltage….….3x400V - 50Hz Phase current: I L1 ……………….12A PF 0,9 CF 2,7 I L2 ……………….18A PF 0,8 CF 2,9 I L3 ……………….17A PF 0,8 CF 3,0

UPS sizing rev Task 3 AC Load Specification Required information Examples... Task 1... Task 2... Task 3... Task 4... Task 5... Review Head lines Task 3

UPS sizing rev Task 3 - Specify the UPS Supply voltage….….3x400V - 50Hz Phase power: P L1 ………………. 103 kW PF 0,9 P L2 ………………. 106 kW PF 0,8 P L3 ………………. 100 kW PF 0,8 Load specifications: Task 3

UPS sizing rev Solution: Silcon DP3480E Comments: Phase P L2 has the highest kVA load S L2 = P L2 /PF L2 = 106/ 0.8 = 132,5 kVA 3 x 132,5 = 397,5kVA A Silcon DP3480E is the solution Task 3 - Solution Solution: Task 3 Load specifications : Supply voltage….3x400V - 50Hz Phase power: P L1 ………………. 103 kW PF 0,9 P L2 ………………. 106 kW PF 0,8 P L3 ………………. 100 kW PF 0,8

UPS sizing rev Task 4 AC Load Specification Required information Examples... Task 1... Task 2... Task 3... Task 4... Task 5... Review Head lines Task 4

UPS sizing rev Task 4 - Specify the UPS Supply voltage….….3x380V - 50Hz Phase power VA: S L1 ………………. 103 kVA PF 0,9 S L2 ………………. 106 kVA PF 0,8 S L3 ………………. 100 kVA PF 0,8 Load specifications: Task 4

UPS sizing rev Solution: Silcon DP3320E Comments: Phase S L2 has the highest kVA load and decides the UPS size S total = 3 x S L2 = 3 x 106 = 318 kVA A Silcon DP3320E is the solution Task 4 - Solution Solution: Task 4 Load specifications : Supply voltage….….3x380V - 50Hz Phase power VA: S L1 ………………. 103 kVA PF 0,9 S L2 ………………. 106 kVA PF 0,8 S L3 ………………. 100 kVA PF 0,8

UPS sizing rev Task 5 AC Load Specification Required information Examples... Task 1... Task 2... Task 3... Task 4... Task 5... Review Head lines Task 5

UPS sizing rev Task 5 - Specify the UPS Supply voltage….….3x380V - 50Hz Phase power W: P L1 ………………. 35 kW PF 0,8 P L2 ………………. 38 kW PF 0,8 P L3 ………………. 40 kW PF 0,8 The motor load is included in the above spec. Load specifications: Task 5 A 25 kW 3-phase motor (PF=0,8) is connected to the UPS (Inrush current is 6 x nominal in 15 sec. ) The demand is that the motor has to be able to start in battery operation

UPS sizing rev Solution: Silcon DP3160E…? Comments: Phase L3 having the highest load S L3 = P L3 / PF L3 = 40/ 0,8 = 50 kVA 3 x 50 = 150 kVA A Silcon DP3160E cut be the solution. But we have to check if the motor is able to start on battery operation... Task 5 - Solution Solution: Task 5 Load specifications : Supply voltage….….3x380V - 50Hz Phase power W: P L1 ………………. 35 kW PF 0,8 P L2 ………………. 38 kW PF 0,8 P L3 ………………. 40 kW PF 0,8

UPS sizing rev Current L1 = 35 kW/ PF 0,8 / 220 V = 198,9 A Current L2 = 38 kW/ PF 0,8 / 220 V = 215,9 A Current L3 = 40 kW/ PF 0,8 / 220 V = 227,3 A Current Motor = 25 kW/ PF 0,8 / 380V x 1,732 = 47,5 A Inrush Motor = 47,5 A x 6 = 285 A Inrush & load = 227,3 + (285-47,5) = 465 A Task 5 - Solution Load specifications : Supply voltage….….3x380V - 50Hz Phase power W: P L1 ………………. 35 kW PF 0,8 P L2 ………………. 38 kW PF 0,8 P L3 ………………. 40 kW PF 0,8 Task 5

UPS sizing rev Solution: Silcon DP3240E Comments DP3160E have 150% overload capacity of 346,5 A DP3240E have 150% overload capacity of 519 A A Silcon DP3160E can’t handle the start up of the Motor A Silcon DP3240E is the solution Task 5 - Solution Load specifications : Supply voltage….….3x380V - 50Hz Phase power W: P L1 ………………. 35 kW PF 0,8 P L2 ………………. 38 kW PF 0,8 P L3 ………………. 40 kW PF 0,8 Task 5

UPS sizing rev Solution: Silcon DP3240E Comments DP3160E have 150% overload capacity of 346,5 A DP3240E have 150% overload capacity of 519 A A Silcon DP3160E can’t handle the start up of the Motor A Silcon DP3240E is the solution Overload alarm... Load specifications : Supply voltage….….3x380V - 50Hz Phase power W: P L1 ………………. 35 kW PF 0,8 P L2 ………………. 38 kW PF 0,8 P L3 ………………. 40 kW PF 0,8 Task 5 Please observe…. The Silcon DP3240E will generate an overload alarm whenever the motor starts!!!

UPS sizing rev Review Review AC Load Specification Required information Examples... Task 1... Task 2... Task 3... Task 4... Task 5... Review