1. Colombo, Sri Lanka, 3-4 October 2013 ITU-T L.1200 Direct 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)

2. Content Colombo, Sri Lanka, 3-4 October 2013 2 HVDC Application Other requirements System Voltage ranges Interface P General Introduction

3. Content Colombo, Sri Lanka, 3-4 October 2013 3 HVDC Application Other requirements System Voltage ranges Interface P General Introduction

4. Summary Colombo, Sri Lanka, 3-4 October 2013 4 Define Interface This Recommendation specifies the direct current (DC) interface between the power feeding system and ICT equipment connected to it. Normal and abnormal voltage ranges, and immunity test levels for ICT equipment to maintain the stability of telecommunicatio n and data communication services. Contents

5. Content Colombo, Sri Lanka, 3-4 October 2013 5 HVDC Application Other requirements System Voltage ranges Interface P General Introduction

6. Interface P in ITU-T L.1200 Interface P Colombo, Sri Lanka, 3-4 October 2013 6

7. Content Colombo, Sri Lanka, 3-4 October 2013 7 HVDC Application Other requirements System Voltage ranges Interface P General Introduction

8. 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 service is 192 V- 288 V. Transitional solutions

9. Content Colombo, Sri Lanka, 3-4 October 2013 9 HVDC Application Other requirements System Voltage ranges Interface P General Introduction

10. Other requirements in ITU-T L.1200 Abnormal DC voltage range For Target solution: –(0V < U < 260 V); –(400V < U < 410 V). Abnormal conditions –Voltage variations; –Voltage dips; –Voltage interruptions; –Voltage surges/transients; –Inrush current. Colombo, Sri Lanka, 3-4 October 2013 10

11. Other requirements in ITU-T L.1200 Abnormal conditions: Voltage variations Colombo, Sri Lanka, 3-4 October 2013 11 UT to 260V,back to UT Duration : 1 min Requirem ents: Normal performa nce Duration : 1 min Requirem ents: Normal performa nce Duration : 1s Requirem ents: Temporar y loss of function, automatic recovery UT to 400V,back to UT UT to 410V,back to UT UT to 420V,back to UT Duration : 10ms Requirem ents: Temporar y loss of function, automatic recovery

12. Other requirements in ITU-T L.1200 Abnormal conditions: Voltage dips Colombo, Sri Lanka, 3-4 October 2013 12 UT to 260V,back to UT Duration : 10ms Requirements: Normal performance

13. Other requirements in ITU-T L.1200 Abnormal conditions: Voltage interruptions Colombo, Sri Lanka, 3-4 October 2013 13 UT to 0V,back to UT Low Impedance: Duration : 10 ms Requirements : Normal performance High impedance Duration : 1s Temporary loss of function, automatic recovery UT to 0V,back to UT

14. Other requirements in ITU-T L.1200 Abnormal conditions: Surges/transients Colombo, Sri Lanka, 3-4 October 2013 14 500V Line to Line 1.2/50 μs (8/20 μs) Requirem ents: Normal performa nce Line to Ground 1.2/50 μs (8/20 μs) Requirem ents: Normal performa nce Line to Line 1.2/50 μs (8/20 μs) Requirem ents: Temporar y loss of function, automatic recovery 500V 2 kV Line to Ground 1.2/50 μs (8/20 μs) Requirem ents: Temporar y loss of function, automatic recovery

15. Other requirements in ITU-T L.1200 Abnormal conditions: Inrush Current Colombo, Sri Lanka, 3-4 October 2013 15 0. 5

16. Content Colombo, Sri Lanka, 3-4 October 2013 16 HVDC Application Other requirements System Voltage ranges Interface P General Introduction

17. HVDC Application Colombo, Sri Lanka, 3-4 October 2013 17 380V 1)NTT Lab 2)France Telecom 3)China Mobile 1) Korean Telecom 2) NTT NEDO 1)China Telecom 300V 240V

18. Colombo, Sri Lanka, 3-4 October 2013 18