Colombo, Sri Lanka, 3-4 October 2013

ITU-T L.1200Direct current power feeding interface

up to 400 V at the input to telecommunication and ICT equipment

Shuguang Qi,Associate Rapportuer of Q19/SG5,

qishuguang@catr.cn

ITU Workshop on “Greening the Future: Bridging the Standardization

Gap on Environmental Sustainability”

(Colombo, Sri Lanka, 3-4 October 2013)

Content

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HVDC Application

Other requirements

System Voltage ranges

Interface P

General Introduction

Content

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HVDC Application

Other requirements

System Voltage ranges

Interface P

General Introduction

General Introduction

Summary

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Define Interface

This Recommendation specifies the direct current (DC) interface between the powerfeeding system and ICT equipment connected to it.

Normal and abnormal voltage ranges, and immunity test levels for ICT equipment to maintain the stability of telecommunication and data communication services.

Contents

Content

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HVDC Application

Other requirements

System Voltage ranges

Interface P

General Introduction

Interface P in ITU-T L.1200

Interface P

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Content

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HVDC Application

Other requirements

System Voltage ranges

Interface P

General Introduction

Normal Output Voltage Ranges in ITU-T L.1200

System Normal Output voltage ranges

Colombo, Sri Lanka, 3-4 October 2013

Target solutions

– The minimum voltage is 260 V.– The maximum voltage is 400 V.

ICT equipment shall maintain a specified normal serviceis 192 V-288 V.

Transitional solutions

Content

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HVDC Application

Other requirements

System Voltage ranges

Interface P

General Introduction

Other requirements in ITU-T L.1200

Abnormal DC voltage rangeFor Target solution:–(0V < U < 260 V);–(400V < U < 410 V).

Abnormal conditions–Voltage variations;–Voltage dips;–Voltage interruptions;–Voltage surges/transients;–Inrush current.

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Other requirements in ITU-T L.1200

Abnormal conditions: Voltage variations

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UT to 260V,back to UT

Duration : 1 minRequirements:Normal performance

Duration : 1 minRequirements:Normal performance

Duration : 1sRequirements: Temporary loss of function, automatic recovery

UT to 400V,back to

UT

UT to 410V,back to

UT

UT to 420V,back to

UT

Duration : 10msRequirements: Temporary loss of function, automatic recovery

Other requirements in ITU-T L.1200

Abnormal conditions: Voltage dips

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UT to 260V,back to UT

Duration : 10ms

Requirements:Normal performance

Other requirements in ITU-T L.1200

Abnormal conditions: Voltage interruptions

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UT to 0V,back to UT

Low Impedance: Duration : 10 msRequirements:Normal performance

HighimpedanceDuration : 1sTemporary loss of function, automatic recovery

UT to 0V,back to UT

Other requirements in ITU-T L.1200

Abnormal conditions: Surges/transients

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500V

Line toLine 1.2/50 μs(8/20 μs)Requirements:Normal performance

Line toGround1.2/50 μs(8/20 μs)Requirements:Normal performance

Line toLine 1.2/50 μs(8/20 μs)Requirements: Temporary loss of function, automatic recovery

500V 2 kV 2 kV

Line toGround1.2/50 μs(8/20 μs)Requirements: Temporary loss of function, automatic recovery

Other requirements in ITU-T L.1200

Abnormal conditions: Inrush Current

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1

5

9

13

17

21

0,1 1 10 100 1000

Ip/I

UT

T50 Pulse Duration (ms)

0.5

Content

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HVDC Application

Other requirements

System Voltage ranges

Interface P

General Introduction

HVDC Application

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380V

1) NTT Lab2) France

Telecom3) China

Mobile

1) Korean Telecom2) NTT NEDO

1)China Telecom

300V 240V

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