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1 TS V1.3.1 ( ) TECHNICAL SPECIFICATION Environmental Engineering (EE); Power distribution to telecommunications and datacom (ICT)
2 2 TS V1.3.1 ( ) Reference RTS/EE Keywords distribution, earthing, power, power supply, system 650 Route des Lucioles F Sophia Antipolis Cedex - FRANCE Tel.: Fax: Siret N NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N 7803/88 Important notice The present document can be downloaded from: The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written authorization of. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive within Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other documents is available at If you find errors in the present document, please send your comment to one of the following services: Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of. The content of the PDF version shall not be modified without the written authorization of. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute All rights reserved. DECT TM, PLUGTESTS TM, UMTS TM and the logo are Trade Marks of registered for the benefit of its Members. 3GPP TM and LTE are Trade Marks of registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association.
3 3 TS V1.3.1 ( ) Contents Intellectual Property Rights... 5 Foreword... 5 Modal verbs terminology... 5 Introduction Scope References Normative references Informative references Definitions and abbreviations Definitions Abbreviations Types of power supply systems DC supply Mains operation Battery operation Floating/Parallel operation DC switch operation Switch operation with interruption Switch operation without interruption DC converter operation Redundant DC distribution AC supply Mains operation Inverter operation AC switch operation AC switch operation with interruption AC switch operation without interruption (STS) AC uninterruptible power supply systems (UPS) Reliability and redundancy Power supply interfaces in telecommunication installations PSI 1 interface between primary power and telecommunication installations and Connection conditions Harmonics and superimposition Radio interference Disturbances on the customer installation Further sources of supply voltage PSI 2 interface Connection conditions Radio interference Interference voltage PSI 3 interface between telecommunication installations or and the telecommunication networks Connection conditions Operation with remote power feeding of current Operation with ringing AC voltage Radio interference Interference voltage Cabling and routing Earthing and equipotential bonding Electrical Safety requirements... 21
4 4 TS V1.3.1 ( ) Annex A (normative): Annex B (informative): Principle of artificial DC mains network for measurement of disturbance Power supply considerations History... 24
5 5 TS V1.3.1 ( ) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to. The information pertaining to these essential IPRs, if any, is publicly available for members and non-members, and can be found in SR : "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to in respect of standards", which is available from the Secretariat. Latest updates are available on the Web server ( Pursuant to the IPR Policy, no investigation, including IPR searches, has been carried out by. No guarantee can be given as to the existence of other IPRs not referenced in SR (or the updates on the Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by Technical Committee Environmental Engineering (EE). Modal verbs terminology In the present document "shall", "shall not", "should", "should not", "may", "may not", "need", "need not", "will", "will not", "can" and "cannot" are to be interpreted as described in clause 3.2 of the Drafting Rules (Verbal forms for the expression of provisions). "must" and "must not" are NOT allowed in deliverables except when used in direct citation. Introduction The present document gives guidance on installation, connection and operation of power supply systems for telecommunication / datacom (ICT) systems and. Also are considered items of with their own power supply, which are connected to form a complete system.
6 6 TS V1.3.1 ( ) 1 Scope The present document gives guidance on installation, connection and operation of power supply systems for telecommunication / datacom installations and s. Also are considered items of with their own power supply, which are connected to form a complete system installation. The present document contains definitions for power supply and distribution systems in complement to power interfaces standards EN series [5], [6], [7], [i.6] and [i.7]. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at While any hyperlinks included in this clause were valid at the time of publication, cannot guarantee their long term validity. 2.1 Normative references The following referenced documents are necessary for the application of the present document. [1] IEC EN 60038: "IEC standard voltages". [2] EN : "Electromagnetic compatibility and Radio spectrum Matters (ERM); Telecommunication network ; ElectroMagnetic Compatibility (EMC) requirements". [3] CENELEC EN : "Information technology - Safety - Part 1: General requirements". [4] CENELEC EN : "Stationary lead-acid batteries - Part 21: Valve regulated types - Methods of test". [5] ETS : "Equipment Engineering (EE); Power supply interface at the input to telecommunications ; Part 1: Operated by alternating current (AC) derived from direct current (DC) sources". [6] EN : "Environmental Engineering (EE); Power supply interface at the input to telecommunications and datacom (ICT) ; Part 2: Operated by -48 V direct current (DC)". [7] EN : "Environmental Engineering (EE); Power supply interface at the input to telecommunications and datacom (ICT) ; Part 3: Operated by rectified current source, alternating current source or direct current source up to 400 V; Sub-part 1: Direct current source up to 400 V". [8] EN : "Environmental Engineering (EE); Powering of in access network". [9] EN : "Environmental Engineering (EE); Earthing and bonding of telecommunication in telecommunication centres". [10] Recommendation ITU-T K.20: "Resistibility of telecommunication installed in a telecommunications centre to overvoltages and overcurrents". [11] Recommendation ITU-T K.21: "Resistibility of telecommunication installed in customer premises to overvoltages and overcurrents".
7 7 TS V1.3.1 ( ) [12] Recommendation ITU-T K.45: "Resistibility of telecommunication installed in the access and trunk networks to overvoltages and overcurrents". [13] CENELEC HD 384 (all parts)/hd 60364: "Electrical installations of buildings". [14] EN : "Electromagnetic compatibility and Radio spectrum Matters (ERM); ElectroMagnetic Compatibility (EMC) standard for radio and services; Part 1: Common technical requirements". [15] CENELEC EN : "Electromagnetic compatibility (EMC) - Part 3-2: Limits - Limits for harmonic current emissions ( input current 16 A per phase)". [16] CENELEC EN : "Electromagnetic compatibility (EMC) - Part 3-3: Limits - Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for with rated current 16 A per phase and not subject to conditional connection". [17] Recommendation ITU-T P.53: "Psophometer for use on telephone-type circuits". [18] CENELEC EN 50310: "Application of equipotential bonding and earthing in buildings with information technology ". [19] CENELEC EN : "Electromagnetic compatibility (EMC) - Part 4-11: Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests". [20] CENELEC EN : "Information technology - Cabling installation - Part 2: Installation planning and practices inside buildings". [21] CENELEC EN : "Uninterruptible power systems (UPS) - Part 1-1: General and safety requirements for UPS used in operator access areas". [22] CENELEC EN : "Uninterruptible power systems (UPS) - Part 1-2: General and safety requirements for UPS used in restricted access locations". [23] CENELEC EN : "Stationary lead-acid batteries - Part 11: Vented types - General requirements and methods of tests". [24] CENELEC EN : "Static transfer systems (STS) - Part 1: General and safety requirements". [25] CENELEC EN : "Stationary lead-acid batteries - Part 22: Valve regulated types - Requirements". [26] EN : "Environmental Engineering (EE); Earthing and bonding of 400 V DC data and telecom (ICT) ". 2.2 Informative references The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. [i.1] [i.2] [i.3] [i.4] [i.5] IEC : "International Electrotechnical Vocabulary. Chapter 601: Generation, transmission and distribution of electricity - General". CENELEC EN Ed. 1.0: "Audio/Video, Information and Communication Technology Equipment - Part 1: Safety requirements". IEC EN 60445: "Basic and safety principle for man-machine interface, marking and identification- Identification of terminals, conductor terminations, and conductors". TR : "Environmental Engineering (EE); Transient voltages at Interface "A" on telecommunications direct current (DC) power distributions". 19 Pfl1: "Voltage limits for 60 V consumers in telecommunication installations of the Deutsche Telekom".
8 8 TS V1.3.1 ( ) [i.6] [i.7] EN : "Environmental Engineering (EE); Power supply interface at the input to telecommunications and datacom (ICT) ; Part 3: Operated by rectified current source, alternating current source or direct current source up to 400 V; Sub-part 0: Overview". EN : "Environmental Engineering (EE); Power supply interface at the input to telecommunications and datacom (ICT) ; Part 3: Operated by rectified current source, alternating current source or direct current source up to 400 V; Sub-part 2: Alternating up to 400 V solution". 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: current-using : either a further power supply system or a telecommunication The telecommunication with associated power supply may be considered as telecommunication installation or telecommunication. disturbance: electromagnetic disturbance having components in the radio frequency range immunity: ability of a device, or system to perform without degradation in the presence of an electromagnetic disturbance power supply system: electrical, which makes available energy obtained from a primary power source (e.g. AC distribution) in a form suitable for the current-using radio interference: degradation of the reception of a wanted signal caused by radio frequency disturbance supply voltage: voltage preferably obtained from the public distribution system or other primary electric power sources Transfer Switch (TS): integrated automatic bypass switch used in the UPS, which can be fully static, fully electromechanical or hybrid 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: AC DC EMC ERM HD ICT MOS PSI SD STS TS UPS Alternating Current Direct Current Electro-Magnetic Compatibility Electromagnetic Radio spectrum Matters Harmonization Document Information and Communication Technology Metal Oxide Semiconductor Power Supply Interface Systems Bypass Switch Safe Disconnection Static Transfer Switches (for the stand-alone static switches) Transfer Switch Uninterruptible Power Supply
9 9 TS V1.3.1 ( ) 4 Types of power supply systems In telecommunication and datacom installations and the designation of a power supply system refers to its output. In this sense there are DC and AC supplies. The operating modes described below are basic forms, which may be developed into more complex arrangements. 4.1 DC supply Mains operation The current-using is supplied with DC voltage obtained by a rectifier from the AC system (see figure 1). The nominal voltage is a normative definition used to enable differentiating power interfaces as defined in IEC [i.1]. Figure 1: Principle of mains operation Battery operation The current-using is supplied from a battery. Both primary and secondary cells (Accumulators) can be used as batteries. The Accumulator is disconnected from the current-using for charging (see figure 2). current using Figure 2: Principle of battery operation Floating/Parallel operation The current-using is connected continuously to a rectifier and battery (see figure 3). Figure 3: Principle of parallel operation
10 10 TS V1.3.1 ( ) The current-using is supplied in parallel operation; the rectifier being dimensioned in such a way that it can cover the total power consumption of the current-using and in addition supply an appropriate charging current for the battery (see figure 3). With this configuration the battery is continuously ready for operation in a fully charged condition. If the mains AC voltage is outside of the specification (e.g. fails, reduction of voltage, high harmonics), the current-using continues to be supplied without interruption. Parallel operation includes a very common charging mode known as floating mode and other charging modes such as intermittent charge. Floating charge is a charging mode where the self-discharge of the battery is compensated by maintaining a sufficient voltage to the battery. The charging voltage can be varied due to temperature compensation. Intermittent charge is a charging mode where the self-discharge of the battery is compensated by periodically raising the voltage of rectifiers for short periods. Between these periods the rectifier voltage is left lower than it should be in floating mode. The aim is to reduce plate corrosion and loss of water, as well as to reduce the risk of thermal runaway. This may help to prolong the life span of batteries used in outdoor s or areas with high ambient temperature DC switch operation The power requirement of the current using is normally provided by a rectifier. A disconnected battery is maintained in a charged condition by a separate charger. If the rectifier fails, the current-using is switched to the battery and supplied by the latter (see figure 4). F F Monitoring of the supply circuit Figure 4: Principle of DC switch operation Switch operation with interruption The power supply of the is briefly interrupted when the current-using is switched between the rectifier and the battery. The battery is not charged in this case by the main power supply but can be recharged in any mode (floating, intermittent) as previously described by a separate charger. Sizing of the primary AC power source and associated protection systems shall take into account the maximum load of the telecom and battery charging power. Battery charging power depends on the battery capacity and required charging-time. Generally, the charging power is from 10 % to 100 % of the power supply of telecom. This solution separates the functions of charging and supplying power to the current-using and allows both to be optimized separately Switch operation without interruption The current-using is switched by switching without interruption between the rectifier and the battery. The distance from the power source to the switching as well as the input circuit of the current-using should be considered.
11 11 TS V1.3.1 ( ) DC converter operation The current-using is supplied with a DC voltage obtained by a DC converter from a DC voltage system (see figure 5). If the DC/DC converter is isolated in accordance with EN [3], different earth connections at input and output are requested. These connections shall comply with EN [9] and EN [18]. current using Figure 5: Principle of DC converter operation Redundant DC distribution For high availability services or hot operation and maintenance on installation, power supply distribution redundancy may be required. It is commonly achieved by independent inputs de-coupled at the input of the current-using in the distribution frame. Another solution is to couple several converters in a minimum of n+1 redundancy at the output. It should be noted that the cabling and protection device of each feed of redundant distribution systems shall be sized to allow for the maximum load of the current-using. It should be noted that redundancy is easier to achieve in DC systems than it is in AC systems as there is no phase difference. However, differences in voltage levels have to be considered for load-sharing purposes. The design of redundant power distribution systems should consider the use of independent power sources. The input current of DC/DC converters in redundant distribution systems will increase as a result of a fault condition e.g. short circuit on the output of any one DC/DC converter. Protection against internal short circuits in a DC/DC converter may be achieved by an active circuit at the input (MOS switch for example). Protection against overvoltage caused by short circuits release may be achieved by active circuits at the output of the DC/DC converter (MOS switch for example). 4.2 AC supply Mains operation The current-using is supplied with AC voltage directly from an AC supply circuit, e.g. a consumer installation or a distribution system (see figure 6). Figure 6: Principle of mains operation
12 12 TS V1.3.1 ( ) Inverter operation The current-using is supplied with AC voltage obtained from an inverter fed by a DC supply system (see figure 7). The telecommunication connected to interface "A", powered by AC derived from DC sources as specified in EN [6] shall comply with ETS [5]. Figure 7: Principle of inverter operation AC switch operation AC switch operation with interruption If the mains AC voltage fails, the current-using is transferred to another AC supply after a time delay i.e. due to an interruption or phase failure (see figure 8). F F Monitoring of the supply circuit Figure 8: Principle of AC switch operation WITH interruption AC switch operation without interruption (STS) The current-using usually operates with very fast switch-over of AC sources without an adverse effect (see figure 9). Zero-time switching requires phase and amplitude synchronization of inputs. Generally, a circuit controls this before switch-over. If synchronization is lost it is possible to achieve switch-over after an introduced time delay that shall comply with EN [19]. This allows inverter or UPS redundancy.
13 13 TS V1.3.1 ( ) Static switch Standby supply (phase-controlled) Figure 9: Principle of AC switch operation WITHOUT interruption In some cases, the static switch can be shunted by mechanical contactors that operate slowly but are more robust to power disturbances. They can withstand the very high short-circuit current available from the AC mains. A general description and safety requirements of STS shall follow EN [24] AC uninterruptible power supply systems (UPS) The current-using is supplied with AC voltage from an UPS. Several configurations exist for static and rotary UPS: online, offline, interactive, and shall be as described in standards EN [21] and EN [22]. The on-line configuration is shown in figures 10a to 10d. The load current path under normal operation is via the rectifier and inverter. This system normally incorporates a Static Bypass Switching device () which provides uninterrupted (synchronized) transfer of the load to the mains supply in the event of an inverter failure. Power efficiency is typically in the range of 85 % to 93 %. The off-line configuration is shown in figures 10e to 10g. The load current path under normal operation is a direct feeding from the mains supply. Separate functions of power conditioning and battery charging are possible. The power efficiency of off-line mode is much higher (97 % to 99 %), but the mains filtering is lower. In figure 10e the inverter can be used in either active or passive standby mode. In active standby mode the inverter output contactor is closed and the inverter output is synchronized to the mains supply. In passive standby mode the inverter output contactor is open and the inverter output has to be synchronized to the mains supply. If synchronization is not possible, a supply interruption and a phase shift at the output may occur during load transfer. In some off-line UPS the inverter is not rated for continuous operation. Some UPS can be operated in either on-line or off-line mode. This can be selected by the user. The line-interactive configuration is a combination of the two previous configurations. Normal operation is similar to the off-line configuration but the inverter is operated to improve input current distortion. In some cases the inverter is used in reverse mode to charge the battery. The off-line configuration - normal operation - is shown in figure 10h. The other operating modes are the same as shown for the off-line UPS in figures 10f to 10g. The power efficiency of the line-interactive mode is in the range 93 % to 97 %. Figures 10a to 10g are examples of possible UPS configurations. During maintenance or intervention on the upstream bypass line with upstream breakers open it is necessary to take into account that possible failure in the control or in the power part of the automatic bypass integrated into the UPS can generate a risk of electric shock upstream the bypass input terminals. To avoid this, backfeed protection has to be provided on the bypass line. Electric shock hazard shall not appear on the input of the backfeed protecting device under normal condition and single fault condition on a component (such as in the control logic or in the power static switch) upon loss of the bypass AC voltage.
14 14 TS V1.3.1 ( ) For high power or fixed installation UPS, the backfeed isolator device could be external to the UPS. In this case, the UPS supplier shall specify the type of the suitable isolating device to be used and provide the functional specifications of the control circuit/command (driven by the UPS) for the external isolator. External (Maintenance) Bypass Contactor UPS Module (with integrated ) Off Inverter dc Link UPS Output interlock (no key) interlock ( key trapped) Denotes manually operated switch Denotes contact of electromagnetic switching device Bold lines indicate the load current path. Figure 10a: On-line AC UPS - normal operation External (Maintenance) Bypass Contactor UPS Module (with integrated ) Off Inverter dc Link UPS Output interlock (no key) interlock ( key trapped) Denotes manually operated switch Denotes contact of electromagnetic switching device Bold lines indicate the load current path. Figure 10b: On-line AC UPS - battery operation
15 15 TS V1.3.1 ( ) External (Maintenance) Bypass Contactor On UPS Module (with integrated ) dc Link Inverter UPS Output interlock (no key) interlock ( key trapped) Bold lines indicate the load current path. Denotes manually operated switch Denotes contact of electromagnetic switching device Figure 10c: On-line AC UPS - operation External (Maintenance) Bypass Contactor UPS Module (with integrated ) Off dc Link Inverter UPS Output interlock (no key) interlock ( key trapped) Denotes manually operated switch Denotes contact of electromagnetic switching device Bold lines indicate the load current path. Figure 10d: On-line AC UPS - external bypass operation
16 16 TS V1.3.1 ( ) External (Maintenance) Bypass UPS Module (with integrated ) Contactor On UPS Output Inverter dc Link interlock (no key) interlock ( key trapped) Denotes manually operated switch Denotes contact of electromagnetic switching device Bold lines indicate the load current path. Figure 10e: Off-line AC UPS - normal operation External (Maintenance) Bypass UPS Module (with integrated ) Contactor Off UPS Output Inverter dc Link interlock (no key) interlock ( key trapped) Denotes manually operated switch Denotes contact of electromagnetic switching device Bold lines indicate the load current path. Figure 10f: Off-line AC UPS - battery-inverter operation
17 17 TS V1.3.1 ( ) External (Maintenance) Bypass UPS Module (with integrated ) Contactor Off UPS Output Inverter dc Link interlock (no key) interlock ( key trapped) Denotes manually operated switch Denotes contact of electromagnetic switching device Bold lines indicate the load current path. Figure 10g: Off-line AC UPS - external bypass operation External (Maintenance) Bypass UPS Module (with integrated ) Voltage regulator and power conditioner On Contactor UPS Output Inverter dc Link interlock (no key) interlock ( key trapped) Denotes manually operated switch Denotes contact of electromagnetic switching device NOTE 1: and inverter in operation. Inverter synchronized to mains supply but not carrying load current. NOTE 2: Bold lines indicate the load current path. Figure 10h: Line-interactive AC UPS - normal operation As with DC power supply systems, the battery can be charged in floating mode or other modes such as intermittent. The battery charging power may be between 10 % to 100 % of the UPS output power. The UPS input power can be twice the output power. In an off-line UPS the rectifier may be dimensioned for battery charging only.
18 18 TS V1.3.1 ( ) The voltage of batteries used in UPS may be much higher than 48 V and the battery may not be connected to earth Reliability and redundancy Battery reliability is determined by the failure mode. An internal short circuit within a single cell has little effect on output autonomy, but a UPS high current rate battery shall be chosen to avoid internal cell opening. Another simple solution currently observed is to have at least two battery branches or overall UPS redundancy, but without doubling the battery capacity. Such configurations are often required to enable battery replacement or UPS maintenance to be carried out safely and without risk of power outage. Redundancy of distribution is achieved on the input side by two mains inputs as shown in figure 10a. 5 Power supply interfaces in telecommunication installations Figure 11 shows the basic forms of interfaces necessary for power supply systems in telecommunication installations which may be developed into more arrangements. The following Power Supply Interfaces (PSI) are defined: PSI 1 interface to power supply circuit, see clause 5.1; PSI 2 interface to distribution system, see clause 5.2; PSI 3 interface to telecommunication system, see clause 5.3. Supply voltage Distribution Telecommunication PSI 1 system PSI 2 PSI 3 a) Telecom and datacom (ICT) b) Telecom and datacom (ICT) c) Isolating switch Telecom and datacom (ICT) Isolating switch Figure 11: Basic forms of the Power Supply Interfaces (PSI)
19 19 TS V1.3.1 ( ) The Safe Disconnection (SD) e.g. isolating switch shall be ensured either in the power supply or in additional (see figure 11): a) usual construction of a telecommunication installation with secondary DC distribution system; b) decentralized telecommunication ; c), e.g. computer. The safe disconnection is required between PSI 1 and PSI 3, if it is not installed in the. 5.1 PSI 1 interface between primary power and telecommunication installations and PSI 1 interface is the power interface between the public mains (commercial AC) and the fed. It shall comply with the voltage defined in EN [1]. Signals may also be present at the PSI 1 interface (e.g. from centralized multi-service control systems) Connection conditions The nominal voltages and nominal voltage ranges shall comply with EN [1] Harmonics and superimposition The telecommunication power supply shall meet the requirements according to the present document. In particular it shall not be adversely affected by the audio-frequency centralized multi-service control systems operated e.g. on the distribution network (or consumer installation). Audio-frequency centralized multi-service control systems with frequencies of 100 Hz to Hz are operated in public distribution networks. Sinusoidal signals up to 10 s long are transmitted, the amplitude being 9 % of the mains voltage amplitude Radio interference All in the telecommunications installation shall comply with the limits according to EN [2] or EN [14]. The cable routing and shielding shall comply with EN [20] Disturbances on the customer installation The effects of the power supply system or telecommunication connected at interface PSI 1 on the supply circuit (including the distribution system) shall satisfy the test conditions and limits established by the relevant applicable standards on disturbance on the main distribution EN [15] and EN [16]. If with a reduced angle of current flow or large current distortion is operated in a three-phase AC customer installation, the thermal load of the neutral conductor may assume three times the value of the load of an outer conductor even with symmetrical load distribution to the three outer conductors. It may be necessary to take this into account in the dimensioning of the installation Further sources of supply voltage Further sources of supply voltage may be stand-by power supply systems, industrial systems, fuel-operated mechanical own current-generating sets (e.g. diesel-electric units or turbine generator sets), thermoelectric generators, fuel cells, solar generators and wind power installations. Specifications for the supply of telecommunication power supply from these power sources, which do not meet the condition of clauses to 5.1.4, should be agreed between the integrator/manufacturer and the operator.
20 20 TS V1.3.1 ( ) 5.2 PSI 2 interface PSI 2 interface is the power interface between the power supply and the distribution system. A PSI 2 interface serves primarily for supply of current-using, and the rating voltages shall not exceed values of EN [3] Connection conditions DC and AC voltages up to rating values defined in EN [3] may occur at the PSI 2 interface. The nominal voltage of the battery defined in EN [4], EN [23] and EN [25] shall be used for the determination of the rating class when using battery systems. Nominal values according to EN [6] shall be used for -48 V DC distribution systems. Annex B of EN [6] gives guidance on working in conjunction with existing -60 V DC supply systems. In Germany additional the 19 Pfl1 [i.5] for the -60 V DC supply system is used. Nominal values according to EN [7] shall be used for connected to distribution systems operated by direct current source up to 400 V Radio interference All in the telecommunications installation shall comply with the EMC and ERM limits of EN [2] and EN [14]. The cable routing and shielding shall comply with EN [20] Interference voltage In DC distribution systems with telephone subscriber feed the permissible limit of the interference voltage U St depends on the requirements with regard to interference voltages at the PSI 3 interface and the damping properties of the subscriber feed circuit. In conventional distribution systems the interference USt (superimposed AC voltage, weighted with A-filter shall comply with Recommendation ITU-T P.53 [17]) may be up to 2 mv at 48 V or 60 V and up to 1 mv at 24 V. This value in distribution systems with 48 V or 60 V is a result of the emitted permissible DC source interference voltage of about 1,8 mv and the vectorial addition of the interference components. The interference voltages present in the distribution system consist of the proportion of the DC source and the total of the effects of the connected current-using. The level of the permissible effects of current-using depends on the arrangement of the distribution system. In a conventional distribution system for 48 V or 60 V the superimposition effect has a maximum of 0,1 mv. (Superimposed AC voltage, weighted with a-filter shall comply with Recommendation ITU-T P.53 [17] and be measured on a simulation device according to annex A). 5.3 PSI 3 interface between telecommunication installations or and the telecommunication networks A PSI 3 interface, if present, primarily provides power and data to the telecommunication and constitutes the connection to the telecommunication network. The interface conditions shall always be used, if a power supply unit or with own power supply (e.g. modem, computer) is to be connected to the telecommunication network.
21 21 TS V1.3.1 ( ) Connection conditions Only voltages of rating class according EN [8] shall be used at the PSI 3 interface. If not meeting these requirements is to be connected at the PSI 3 interface, safe separation of the PSI 3 interface shall be ensured by additional measures. The resistibility of telecommunication to overvoltages and overcurrent shall comply with Recommendations ITU-T K.20 [10] and K.21 [11]. The resistibility of telecommunication installed in the access and trunk networks to overvoltages and overcurrents shall comply with Recommendation ITU-T K.45 [12]. The leakage current conditions shall comply with EN [3] if parts of are connected together. The leakage currents at the PSI 3 interface may add up to larger values than approved for the individual. This applies in particular in the case of a fault Operation with remote power feeding of current It shall comply with EN [8] Operation with ringing AC voltage It shall comply with EN [3] Radio interference All in the telecommunications installation shall comply with the EMC and ERM limits of EN [2] and EN [14]. The cable routing and shielding description shall comply with EN [20] Interference voltage The permissible interference voltage on the PSI 3 interface shall be agreed between the installer and operator depending on the application. In conventional analogue telephone subscriber connection the interference voltage (superimposed AC voltage, weighted with a filter shall comply with Recommendation ITU-T P.53 [17]) may be up to 0,2 mv. 5.4 Cabling and routing See clause The different parameters used for the calculation of the characteristics of electrical wiring systems shall comply with rules of HD 384/HD [13]. 6 Earthing and equipotential bonding Earthing and equipotential bonding of Telecom and ICT shall comply with EN [9] and EN [18] for AC and -48 V distribution and to EN [26] for up to 400 V DC distribution. 7 Electrical Safety requirements The safety requirements are not covered by the present document. Information technology safety is defined in EN [3] for mains-powered or batterypowered information technology, including business and associated, with rated voltage not exceeding 600 V. EN [i.2] describes the product safety requirements and the basic safety principles. The marking and identification are in EN [i.3]. Electrical installation and power supply safety is covered by relevant IEC standards. Transient voltages requirements at Interface "A" on telecommunications direct (DC) power distribution systems contain TR [i.4].
22 22 TS V1.3.1 ( ) Annex A (normative): Principle of artificial DC mains network for measurement of disturbance The measurement of disturbance according to clause shall be made using the artificial DC mains network of figure A.1 (from 19 Pfl1 [i.5]). L < 100 uh R < 20m ohm + C uf Interfering voltage C 2 16 uf + C 4 Output (see NOTE) C 3 16 uf Simulation of conventional environment of the current-using. Figure A.1: Measuring circuit
23 23 TS V1.3.1 ( ) Annex B (informative): Power supply considerations The increase of service and the new packet switching network has led to more telecommunications and datacom (ICT) in the same existing telecommunication centres. The power consumption related to the standard phone services with telecommunications and datacom (ICT) in -48 V decreases, but the power needed by these new services and packet networks increases and the power interface is generally AC voltage, the standard interface in the computer field. Moreover, the density of electronic integration in telecommunication and computer fields increases, requiring more power density. Generally higher current is needed on the powering wire. As a consequence, the nominal voltages proposed in the present document have been defined for: unifying the power supply of the telecommunications and datacom (ICT) and the Information Technology Equipment; decreasing the losses in the power distribution wire as well as copper cross-section; maintaining a highly reliable power source for telecommunication centres or data-centers; enabling the use of the same DC interface in customer premises for powering telecommunications and datacom (ICT). The corresponding power supply can be based on a range of different configurations including: mains + rectifier; mains + rectifier + battery; rectifier + battery + other DC source input (e.g. from renewable energy controller of photovoltaic type); mains + back-up generator (e.g. diesel generator) at the input; any redundancy and modularity of the previous solution; if a DC energy storage device (e.g. battery) is used, it should be selected/designed to fit into the normal service voltage range; selection should take into account: - battery charging voltage( 400 V DC); - battery end of discharge voltage and voltage drop in the distribution system.
24 24 TS V1.3.1 ( ) History Document history V1.1.1 January 2004 Publication V1.2.1 November 2005 Publication V1.3.1 July 2014 Publication
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