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Technical Series Edition 13Electric Power Distribution in Data Centres using L-PDUs

Totally Integrated Power

www.siemens.com/tip-cs

Short innovation cycles in information technology and the dynamics of changing customer requirements in the data centre market aggravate the operator's capacity planning. Besides the call for high availability of the data centre, these factors significantly influence the planning of electric power distribution. A technology that easily and quickly adapts to varying spatial settings – using standardised modules is becoming more and more important. In this situation, it shall be possible to gear the components, plants, and sys-tems for power distribution to changed room structures, new customer and task settings as well as requested load management requirements. We will demonstrate below that busbar trunking systems for line distribution to data centre server rooms are very well suited to meet these demands. To simplify the description, they are referred to as L-PDUs (line power distribution units).

In contrast to a costly and resource-consuming oversizing, a modular concept with clear structures and few, well matched components is the option of choice. The system-atic design of the IT power supply catering for different rack configurations is exemplified by the typical power demand for a server room in the range of about 600 kW.

The most important aspect of data centre operation is a ser-vice availability as high as possible. Increasing the IT availa-bility can, for example, be achieved by curbing dangers in the server room. This can be done by reducing fire loads and improving the accessibility and change options of the power supply system.

1. Introduction: busbar trunking systems

Whereas the US-influenced part of the DaC market (DaC: data centre) prefers power distribution using point-to-point distribution boards (with PDUs – power distribution units – and radially outgoing cables), the European-influenced DaC market more and more frequently uses line distribution with busbar trunking systems (BTS) and distributed tap-off units (Fig. 1). As we will demonstrate below, the use of busbar trunking systems with tap-off units at variable positions is the method of choice to implement a flexible and modular kit system. In analogy to the PDU, this is here called an L-PDU.

At first, we will present the advantages of power distribu-tion using busbar trunking systems compared to cable-ori-ented solutions. Then, we will describe the framework parameters of the server room and power distribution to the server racks. The functional concept for designing an L-PDU is then implemented for the server room acting as an exam-ple, and a type synopsis will be derived from it. Thus, the space requirements for different configurations will be esti-mated and possible optional features of the L-PDU tap-off units will be listed up. Finally, implementation examples in SIMARIS design will be introduced and the technical back-ground of selectivity and back-up protection for the pre-sented solutions will be explained.

Generator

Generator

PDU Rack 1 ... n

Rack 1 ... nUPSMV sitchgear Transformer LV switchboard

UPSMV sitchgear Transformer LV switchboard LV distribution

LV distribution

Transmission busbar

Distribution busbar

Distribution busbar

Fig. 1: Comparison of solutions for power distribution using cables or busbar trunking systems (BTS) in the data centre

2

Compared to conventional cable installation, BTS provides many power system and plant engineering advantages, as illustrated in the synopsis in Tab. 1 and Fig. 1. Modifications and conversions of the electric power supply system usually mean a significantly higher time and cost expense if cable installations are involved than in the case of a BTS solution. Besides the considerable installation time saving, BTS also

2. Comparison of power supply solutions using BTS or cabling

Features Busbar trunking system Cable installation

Network topologyLine-type topology using serial load feeders implemented with power tap-off units

Cable agglomeration at the feed-in point due to the radial supply of loads

Operational safetyDesign test in accordance with IEC 61439-6, (VDE 0660-600)

Dependent on the individual design quality

Flexibility

- Flexible in case of expansions (additional tap-off units) - Flexible in case of modifications (adding/removing tap-off units)- Flexible in case of maintenance work (live installation also possible)

High maintenance expense owing to splicings, clamping points, cable sleeves, parallel lines etc.; installation work only possible in de-energized state

Fire load Very low fire load

PVC cables: up to 10 times higher fire load than with BTS PE cables: up to 30 times higher fire load than with BTS

Electromagnetic compatibility (EMC)

Construction-related advantages in terms of EMC owing to metal encapsulation and special conductor arrangement

High influence on standard cables; in case of single-core cables high dependency of EMC on the type of bundling (see /1/)

Current carrying capacity

System-inherent higher current carrying capacity than with cables of the same cross section

Installation method, accumulation and operating conditions determine the permissible current carrying capacity

Freedom from halogens and PVC

Busbar trunking units are free from halogens as a matter of principle

Standard cables are not free from halogens and PVC; halogen-free cables are expensive

Space requirementsCompact design due to a high current carrying capacity, standard-type elbow and linking pieces

A lot of space required owing to bending radii, installation method, cable accumulation and current carrying capacity (consideration of reduction factors)

WeightCompared to cables weight reduced to half or even one third of the cable weight

Up to 3 times the weight of a comparable BTS

InstallationUncomplicated installation with the help of simple tools and in a short time

Sophisticated installation with lots of tools; noticeably longer installation times (in particular for mounting the cable support systems)

Tab. 1: Comparison of characteristic features of BTS and cable installations

provide a much greater flexibility of rack connections during ongoing service. The cost comparison between BTS and cable solutions also reflects advantages of up to 30% (see bibliographical note /1/) in favour of BTS. An important reason for this is the lower operating cost due to lower energy losses when using BTS.

3

A typical situation in data centres is that servers and IT equip-ment with different power requirements are connected to the power supply system. Moreover, frequent changes in the structuring and use of the server room must be expected in data centres, so that a variable and modular concept is advantageous for power supply in the server room. The design of BTS and the standardized outfit of the tap-off units are ideally suited for use in such a concept.

In particular, the modules presented below can be integrated into power supply concepts for data centres. Such a concept which ranges from the medium-voltage level to the connec-tion of the servers and other power consumers is described in the application manual /1/.

The framework parameters of the power supply modules are as follows:

• For a server room an electric power demand in the range of 600 kW is assumed.

• Power transmission to and in the server room is implemented by a transmission busbar trunking system, which is sometimes referred to as backbone distribution in the server room (comparable to the backbone in the human nervous system, the core data line in IT is also called the backbone). In a redundant supply system, two transmission busbar trunking systems (A/B) are usually routed through the server room.

• Power distribution from the transmission busbar trunking system to the server racks is either performed using

- 4 busbar lines (standard BTS with 250 A operating current each) in case of a rack power demand of less than 10 kW

or

- 2 busbar lines (standard BTS with 630 A operating current each) in case of a rack power demand of equal to or greater than 10 kW

Compared to cabling, a solution featuring BTS for power supply in the server room is also beneficial in case of an intended subsequent performance increase of individual racks. By splitting the distribution busbar trunking systems, by means of the easy and fast replacement of pre-assem-

bled busbar trunking units, and by doubling transmission busbar trunking systems, as shown in Fig. 2, the rack perfor-mance can easily and safely be doubled, in parts even with existing material. In case of a cable solution, the entire power distribution system in the server room (all cables and PDUs) must be replaced and connected again.

BTS A BTS B BTS A1 BTS B1 BTS A2 BTS B2

10 kW per rack 20 kW per rack 20 kW per rack

Fig. 2: Performance doubling using BTS in the server room

3. Construction of a modular busbar trunking kit system for data centres

4

Fig. 3 schematically shows power supply in the server room for the two different power distribution systems. Tab. 2 lists

BTS ALIA1000(600 kW)

BTS BLIA1000(600 kW)

. . . . .

. . . . .

4

3

2

1

4

3

2

1

BTS ALIA1000(600 kW)

BTS BLIA1000(600 kW)

2

12

1

. . . . .

. . . . .

. . . . .

. . . . .

Rack power:

3 kW, 4.5 kW, 6 kW

Distribution BTS: BD2A 250 A (4 x ca. 170 kW)

Rack power:

10 kW, 15 kW, 20 kW

Distribution BTS: BD2A 630 A (2 x ca. 435 kW)

600 kW server room module 600 kW server room module

the typical components of the modules and the selected product series.

Fig. 3: Supply variants in the server room in case of a rack power of less than 10 kW, and equal to or greater than 10 kW

Module component Product series

Power transmission into the server room SIVACON 8PS, LI system

Protection of tap-off units on the transmission busbar trunking system

MCCBs (e.g. 3VL or 3VA)

Measuring / Monitoring in the tap-off units on the trans-mission busbar trunking system

7KM PAC4200 measuring devices

Power distribution from the transmission busbar trunking system to the server racks

SIVACON 8PS, BD2 system

Protection of tap-off units in the distribution board- for up to and incl. 6 kW rack power: 1-pole MCBs (e.g. 5SY71… / 5SY81…) - for a rack power of 10 kW and more: 3-pole MCBs (e.g. 5SY73… / 5SY83…)

Measuring / Monitoring in the tap-off units in the distribu-tion board

7KM PAC3100 measuring devices

Tab. 2: Recommended product series for building a L-PDU

5

For a power demand in the range of 600 kW, typical outfits can be defined in dependency of the rack power. 3 kW, 4.5 kW, and 6 kW are chosen as typical rack power values for 1-phase supply, and 10 kW, 15 kW, and 20 kW for 3-phase supply.

In order to optimally utilise the distribution busbar tap-off units, they are either equipped with 2 or 4 items of the 3-pole, or 3 or 6 items of the 1-pole MCBs. For a better trans-parency of the configuration, 6 or 8 tap-off units are used per line (see Fig. 4 to 9). Together with the corresponding MCBs, this results in different total power values, as given in Tab. 3.

Matching the different configurations, Tab. 4 lists the devices used as modules and summarizes some specific data. Fig. 4 to 9 depict the modules schematically.

The individual configurations of the tap-off units are summa-rized in a sample file for SIMARIS design (DaC_tap-off_units_versions_v1.sd) which is attached to this PDF file edition of the Technical Series.

4. Typical configurations for the selected power category of the server room

Number of tap-off units

Number of MCBs per tap-off unit

Number of lines (with-out redundancy) Power demand per rack

Total power in the server room 1)

8 6 4 3 kW rack power 576 kW

6 6 4 4.5 kW rack power 648 kW





1) Total power in the server room = number of tap-off units x number of MCBs per tap-off unit x number of lines x power demand per rack

Tab. 3: Power demand determination for different modules

Rack power 3 kW, 1-phase 4.5 kW, 1-phase 6 kW, 1-phase 10 kW, 3-phase

15 kW, 3-phase

20 kW, 3-phase

Backbone BTS2 lines

LIA10002 lines

LIA1000

Tap-off units (ToU)

Quantity 4 2

MCCBs1 x per ToU

3VL3 / 3VA221 x per ToU

3VL3 / 3VA22

Measuring device

1 x each 7KM PAC4200

1 x each 7KM PAC4200

Distribution BTS4 lines BD2A

4 lines BD2A

4 lines BD2A

2 lines BD2A

2 lines BD2A

2 lines BD2A

Tap-off units (ToU)

Quantity 8 6 8 8 6 8

MCBs

6 x per ToU 5SY8516-7... or 5SY7516-7...

6 x per ToU 5SY8525-7... or 5SY7525-7...

3 x per ToU 5SY8532-7... or 5SY7532-7...

4 x per ToU 5SY8616-7... or 5SY7616-7...

4 x per ToU 5SY8625-7... or 5SY7625-7...

2 x ToU 5SY8632-7... or 5SY7632-7...

Nominal current, characteristic

16 A, 1-pole, C

25 A, 1-pole, C

32 A, 1-pole, C

16 A, 3-pole, C

25 A, 3-pole, C

32 A, 3-pole, C

Measuring device

1 x per ToU 7KM PAC3100






Line from tap-off unit to rack

Minimum conductor cross section

2.5 mm2 2.5 mm2 4 mm2 2.5 mm2 2.5 mm2 4 mm2

Tab. 4: Rack-power-specific modules of L-PDU distribution for a 600 kW server room

6

Up to a rack power of 6 kW, it is recommended to supply the server racks with 1-phase alternating current. This entails the advantage of lower short-circuit currents compared to that using 3-phase supply. This has a positive effect on personal safety and plant protection as well as plant availability owing to the more favourable selectivity conditions. Another advan-tage of the AC variant in contrast to the one using 3-phase current is that in case of a fault, the two phases unaffected from the fault will remain operable and thus the racks con-nected to them, when 1-phase protection is chosen. With 10 kW and above, rack power supply using 3-phase current usu-ally becomes more reasonable under economic aspects.

The graphic illustration in Fig. 4 to 9 allows to make a rough assessment of the space required for the different modules, so that Tab. 5 deduces a power-related space demand.

Fig. 4: DaC module with 192 x 3 kW racks

Possible options for fitting out the tap-off units are:

• Motorized operating mechanisms for remote, on/off switching of the circuits

• Auxiliary switches to display the switch position and sig-nalling breaker trip

• Residual-current monitoring, earth-fault current monitoring

• Measuring devices for determining currents and voltages down to the energy quality determination at rack level (usu-ally a simple measurement, e.g. using a type 7KM PAC3100 device suffices for individual rack feeding)

Rack power

Num-ber of racks

Module power

Power-related floor space required (estimated)

3 kW 192 576 kW 1.1 kW/m2

4.5 kW 144 648 kW 1.55 kW/m2

6 kW 96 576 kW 1.95 kW/m2

10 kW 64 640 kW 2.45 kW/m2

15 kW 48 720 kW 3.5 kW/m2

20 kW 32 640 kW 4.3 kW/m2

Tab. 5: Floor space estimates for the various modules

7

Fig. 5: DaC module with 144 x 4.5 kW racks


8




9

Fig. 10 shows the configurations for the 6 different rack power variants together with electric power distribution from the medium-voltage level to the busbar tap-off units (compa-rable with the SIMARIS design sample file DaC_tap-off_units_versions_v1.sd).

Fig. 11 comprises the SIMARIS network diagrams for the 1-phase example with 6 kW and the 3-phase with 20 kW rack power. SIMARIS design allows to identify the selectivity of the individual protective devices by different colours. Green means full selectivity of the protective device, whereas yellow indicates that the protective device is only selective to the upstream protective device up to a certain short-circuit cur-rent Isel-kurz. The maximum short-circuit current Ikmax, which was calculated by SIMARIS design effective at the protective device, may possibly be greater than Isel-kurz, so that under unfavourable conditions, the upstream protective device will trip together with the protective device which was assigned

5. Dimensioning with SIMARIS design and selectivity evaluations

to the faulty circuit. Thus, the downstream device is pro-tected by the upstream one (this is called "back-up protec-tion"). This allows to attain a much more cost-effective dimensioning.

In the module example with the 6 kW racks (Fig. 11, top) some of the MCBs in the tap-off units on the distribution bus-bar trunking system are fully selective (green), since the max-imum short-circuit current Ikmax at the circuit "start point" is already below the selectivity threshold for the trip short-cir-cuit current Isel-kurz of the combination of switching devices (here: MCCB 3VL and MCB 5SY). The partial selectivity of the other MCBs (marked in light orange) becomes clear in the selectivity diagrams taken from SIMARIS design (exemplified in Fig. 12). In the range between 14.7 kA and 19.7 kA, it is not reliably ensured that only the protective switching device assigned to the fault location will trip – here the MCB 5SY – but it is also the upstream protective switching device – here the MCCB 3VL – which could respond simultaneously.

Fig. 10: SIMARIS design sample for L-PDU configurations with different rack power values

MS-LS 1.1A1Circuit-breaker CB-f ARIn (switch) = 630 ATransformer current = 50/1 AUMZ: 7SJ8011

Trafo 1.1A1Sn = 1,250 A, ukr = 6 %20/0.4 kV Dyn54GB61673DY001AA0

NS-LS 1.1A1Circuit-breakerIn = 2,000 A3WL11202EB311AA2/LSIN


30 m busbarLI-AM20005H-55

MS-K/L 1.1A150 m N2XS2Y, VPE 3 x 35

Input

distrib

ution

busb

arCi

rcuit-b

reak

erIn

= 25

0 A3V

L372

51DC

360A

A0/LI

Input

distrib

ution

busb

arCi

rcuit-b

reak

erIn

= 53

0 A3V

L576

31SE

60AA

0/LSI

Cable/line5 mCu 3(3x185/185/95)

Cable

/line

10 m

Cu 1(

3x12

0/120

/70)

TN-S

Un =

400 V

Dist

ribut

ion

busb

ar

25 m

BD2A

-2-2

50

Cable

/line

10 m

Cu 2(

3x18

5/185

/95)

TN-S

Un =

400 V

Dist

ribut

ion

busb

ar 2

25 m

BD2A

-2-6

30

20 m

15 m

5 m

TN-S Un = 400 V

Transport busbar25 mLI-AM10005H-55 Rack 3kW, 1-phase

In = 13 AUn = 230 V1+N-pole

Rack 4.5kW, 1-phaseIn = 19.5 AUn = 230 V1+N-pole

MCB tap-off unitMiniature circuit-breakerIn = 16 A5SY85167/C


Rack 6kW, 1-phaseIn = 26 AUn = 230 V1+N-polel


Cable/line10 mCu 1(1x2.5/2.5/2.5)

Cable/line10 mCu 1(1x2.5/2.5/2.5)

Dummy loadIn = 213 AUn = 400 V3-pole


6 m 7 m 20 m

5 m

Rack 10kW, 3-phaseIn = 14.4 AUn = 230 V1+N-pole






Cable/line10 mCu 1(3x2.5/2.5/2.5)

Cable/line10 mCu 1(3x2.5/2.5/2.5)



6 m 7 m 20 m

Server room with different rack power inputs

10

Fig. 11: Network diagram from SIMARIS design for server rooms with 6 kW racks and 20 kW racks

TN-S

Un =

400 V

TN-S

Un =

400 V

TN-S

Un =

400 V

TN-S

Un =

400 V

MS-K/L 1.1A150 m N2XS2Y, VPE 3 x 35

6 m3 m

TN-S Un = 400 V

12 m

9 m

4 m 5 m 12 m 18 m 19 m

4 m 5 m 12 m 18 m 19 m

4 m 5 m 12 m 18 m 19 m

4 m 5 m 12 m 18 m 19 m

MS-K/L 1.1A150 m, N2XS2Y, VPE 3 x 35

TN-S

Un =

400 V

8 m4 m

4 m

TN-S Un = 400 V

4.5 m 10 m 14 m 14.5 m

TN-S

Un =

400 V

4 m 4.5 m 10 m 14 m 14.5 m

Server room with 96 x 6 kW racks

Server room with 32 x 20 kW racks

Transport busbar15mLI-AM10005H-55 Racks 1.4 to 1.21

Racks 2.4 to 2.21

Racks 3.4 to 3.21


Trafo 1.1A1Sn = 1,250 A, ukr = 6 %20/0.4 kV Dyn54GB61673DY001AA0





Input

distrib

ution

busb

arCi

rcuit-b

reak

erIn

=25

0 A3V

L372

51DC

360A

A0/LI

Cable

/line

5 m Cu 1(

3x12

0/120

/70)

Dist

ribut

ion

busb

ar 1

20 m

BD2A

-2-2

50

Rack 1.1In = 26 AUn = 400 V1+N-pole








































Racks 4.4 to 4.21 Rack 4.22In = 26 AUn = 230 V1+N-pole




































Dist

ribut

ion

busb

ar 2

16 m

BD2A

-2-2

50

Dist

ribut

ion

busb

ar 3

16 m

BD2A

-2-2

50

Dist

ribut

ion

busb

ar 4

16 m

BD2A

-2-2

50

Input

distrib

ution

busb

arCi

rcuit-b

reak

erIn

=25

0 A3V

L372

51DC

360A

A0/LI

Cable

/line

5 m Cu 1(

3x12

0/120

/70)

Input

distrib

ution

busb

arCi

rcuit-b

reak

erIn

=25

0 A3V

L372

51DC

360A

A0/LI

Cable

/line

5 m Cu 1(

3x12

0/120

/70)

Input

distrib

ution

busb

arCi

rcuit-b

reak

erIn

=25

0 A3V

L372

51DC

360A

A0/LI

Cable

/line

5 m Cu 1(

3x12

0/120

/70)


Trafo 1.1A1Sn = 1,250 A, ukr = 6 %20/0,4 kV Dyn54GB61673DY001AA0

NS-LS 1.1A1bCircuit-breakerIn = 2,000 A3WL11202EB311AA2/LSIN

CB 1.1A.5aCircuit-breakerIn = 1,000 A3WL12103EB311AA2/LSIN




Rack 1.15In = 28.9 AUn = 400 V3+N-pole






Racks 1.3 to 1.14








Racks 2.3 to 2.14

Input

distrib

ution

busb

arCi

rcuit-b

reak

erIn

= 63

0 A3V

L576

31SE

360A

A0/LS

I

Cable

/line

5 m Cu 2(

3x12

0/120

/70)

Dist

ribut

ion

busb

ar 1

16 m

BD2A

-2-6

30







Input

distrib

ution

busb

arCi

rcuit-b

reak

erIn

= 63

0 A3V

L576

31SE

360A

A0/LS

I

Cable

/line

5 m Cu 2(

3x12

0/120

/70)

Dist

ribut

ion

busb

ar 2

16 m

BD2A

-2-6

30







Transport busbar12mLI-AM10005H-55

4.5 m 18.5 m

4.5 m 18.5 m

4.5 m 18.5 m

4.5 m 18.5 m

11

Fig. 12: Selectivity diagram for a partially selective MCB in the distribution busbar's tap-off unit for the 6 kW rack solution

101 102 103 104 105

I [A]

10-3

t [s]

10-2

10-1

1

101

102

103

104

*)

Rack 1.16 kW, 1-phaseI

kmax = 2,542 A

Ikmin

= 1,788 A

MCB tap-off unitI

cu = 30 kA

5SY86327/C

Enveloppe of upstream devicesMCB tap-off unit I

kmax = 19.708 kA

Isel-kurz

= 14.7 kA I

kmin = 1.788 kA

Range where the upstream MCCB (3VL)

shall offer backup-protection for the shown MCB (5SY)

Legend, left:

Cut-out from the DaC power distribution (Fig. 11) for a 6 kW rack with partial selectivity

Range of the greatest fault probability (inside the rack and on a large part of the cable from the MCB to the rack, selective disconnection is effected by the MCB in case of a fault))

Fault range in which the upstream MCCB (3VL) may act as back-up protection for the MCB (5SY), if required, and also trips in the worst case

*) The diagram on the right shows the Ikmax value directly at the MCB. For the further course of rack connection in the left part, lower Ikmax values would be present, until selectivity is finally reached (green).

Selectivity rangebetween I

kmin

and Isel-kurz

Usually, the MCCB will act as back-up protection and limit the short-circuit current, so that the MCB trips without the MCCB tripping as well. Under unfavourable conditions, both break-ers may also trip.

In SIMARIS design, the relevant short-circuit current values are given in the selectivity diagram – the maximum value at the circuit start point and the minimum value at the circuit end point. Since the maximum short-circuit current values continually decrease from the circuit start point to the rack connection point, it can be expected that only a short circuit in the vicinity of the MCB inside the distribution busbar tap-off unit will – in the worst case – result in an MCCB trip in the tap-off unit on the transmission busbar trunking system.

Owing to the restricted access to server rooms in data cen-tres, faults in the cable or in the tap-off unit itself can practi-cally be ruled out. Experience has shown that faults at the final distribution level of a data centre almost always occur in the power supply units of the IT equipment and the PDUs in the racks.

Faults in the PDU and the server power supply units will be selectively cleared by the MCB of the distribution busbar trunking system. This becomes evident from the fault cur-rents at the cable end, as shown in Fig. 12:

Ikmin = 1.788 kA (relevant for the disconnect condition and hence for personal safety)

Ikmax = 2.544 kA (relevant for the selectivity evaluation)

Both values are far below the selectivity threshold of this device combination (14.7 kA), so that faults occurring in real-ity will be disconnected selectively.

Moreover, redundancies existing in the data centre must be considered as well, which is why even a disconnection of one distribution busbar trunking system would not mean a fail-ure. A far-reaching selectivity is ensured for the modules. A negligible remaining risk normally has no direct consequences.

12

SIMARIS® design: Network calculation and dimensioning

of short-circuit current

Using the SIMARIS design software, you will perform network calculations including

short-circuit current calculations based on real products with a minimum of input – from the

medium voltage level to the power consumers.

In addition, the software calculates the load flow and voltage drop and returns an energy

report.

www.siemens.com/simaris

The pre-configured modules for electric power distribution to server rooms which are described here simplify planning and provide a flexible and cost-effective solution at the same time. To meet the high requirements of supply reliability and selectivity in the data centre, it is indispensable to use well-matched products and systems, as demonstrated above.

If you have any questions, please do not hesitate to get in touch with your local contact:

www.siemens.com/tip-cs/contact

Author:

Ingo Englert, Siemens AG

[email protected]

Bibliography:

/1/ Siemens AG, 2013, Application Models for Power Distribution – Data Centres

Attached sample files for SIMARIS design:

- DaC_tap-off_units_versions_v1.sd

- Example_6kW_1phase_v1.sd

- Example_20kW_3phase_v1.sd

6. Conclusion

13

Siemens AG Energy Management Division Medium Voltage & Systems Mozartstr. 31 c 91052 Erlangen Germany

E-mail: [email protected]

Subject to change without prior notice • 11/14 © 2014 Siemens AG • All rights reserved.

www.siemens.com/tip-cs

The information in this brochure only includes general descriptions and/or performance characteristics, which do not always apply in the form described in a specific applica-tion, or which may change as products are developed. The required performance characteristics are only binding if they are expressly agreed at the point of conclusion of the contract.

All product names may be trademarks or product names of Siemens AG or supplier companies; use by third parties for their own purposes could constitute a violation of the own-er‘s rights.

14

DaC_tap-off_units_versions_v1.pod

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