HIGH VOLTAGE INTERFERENCE CALCULATION

Transcription

1 HIGH VOLTAGE INTERFERENCE CALCULATION

2 PIPELINE ROUTING

3 HIGH VOLTAGE INTERFERENCE INDUCED PIPE TO SOIL VOLTAGE

4 HIGH VOLTAGE INTERFERENCE INDUCED PIPE TO SOIL VOLTAGE SIGNIFICANT PARAMETERS IN ANALYSIS OF HVAC INTERFERENCE ON PIPELINES Electromagnetic field Soil resistivity Ω x m Length parallelism Coating quality Coating resistance Offset distance

5 MEASURES AGAINST AC INDUCED VOLTAGES IN UNDERGROUND PIPELINES

6 PRINCIPLE OF THE INDUCTIVE INTERFERENCE OF PIPELINES BY OVERHEAD POWER LINES

7 MEASURES AGAINST AC INDUCED VOLTAGES IN UNDERGROUND PIPELINES

8 MEASURES AGAINST AC INDUCED VOLTAGES IN UNDERGROUND PIPELINES

9 CALCULATION REQUIREMENTS

10 REQUIRED INPUT DATA FOR CALCULATION PIPELINE PIPELINE DATA DATA Outside Outside diameter diameter pipeline pipeline Thickness Thickness pipeline pipeline coating coating Distance Distance pipeline pipeline axis axis to to ground ground level level Pipeline Pipeline coating coating resistance resistance Specific Specific soil soil resistivity resistivity INFLUENCED SECTION DATA INFLUENCED SECTION DATA Start Start point point section section End End point point section section Offset Offset distance distance pipeline pipeline overhead overhead line line OPERATING OPERATING DATA DATA OF OF OVERHEAD OVERHEAD LINE LINE Type Type conductor conductor Maximum Maximum operating operating current current Operating Operating frequency frequency Neutral Neutral point point system system Short Short circuit circuit earth earth fault fault current current Diameter Diameter and and resistance resistance earth earth wire wire OVERHEAD LINE TOWER DATA OVERHEAD LINE TOWER DATA X X Y Y coordinates coordinates conductors conductors and and earthwire earthwire Maximum Maximum conductor conductor sag sag

11 CALCULATION OF INDUCTIVE INFLUENCE ON A PIPELINE ON THE BASIS OF A MODEL SIMULATION Induced pipe to soil voltage caused by operating currents Pipeline Outside diameter 800 mm Coating resistance 100 kω/m 2 Length parallism 10 km Offset distance pipeline-overhead line 40 m Overhead line 2 three-phase-systems 380 kv System operating currents 1.6 ka

12 CALCULATION OF INDUCTIVE INFLUENCE ON A PIPELINE ON THE BASIS OF A MODEL SIMULATION Induced pipe to soil voltage caused by short circuit current Pipeline Outside diameter 800 mm Coating resistance 100 kω/m 2 Length parallism 10 km Offset distance pipeline-overhead line 40 m Overhead line 2 three-phase-systems 380 kv Short circuit current 9.0 ka

13 CALCULATION OF INDUCTIVE INFLUENCE ON A PIPELINE ON THE BASIS OF A MODEL SIMULATION Influence the distance between pipeline and overhead line

14 CALCULATION OF INDUCTIVE INFLUENCE ON A PIPELINE ON THE BASIS OF A MODEL SIMULATION Influence pipeline coating resistance [r u ] Pipeline Outside diameter 800 mm Coating resistance 100 / 10 kω/m 2 Length parallism 10 km Offset distance pipeline-overhead line 40 m Overhead line 2 three-phase-systems 380 kv System operating currents 1.6 ka

15 CALCULATION OF INDUCTIVE INFLUENCE ON A PIPELINE ON THE BASIS OF A MODEL SIMULATION Influence specific soil resistance Pipeline Outside diameter 800 mm Coating resistance 100 kω/m 2 Length parallism 10 km Offset distance pipeline-overhead line 40 m Overhead line 2 three-phase-systems 380 kv System operating currents 1.6 ka

16 CALCULATION OF INDUCTIVE INFLUENCE ON A PIPELINE ON THE BASIS OF A MODEL SIMULATION Earthing measures to degrade the pipe to soil potential under 1000 V caused by short circuit current Pipeline Outside diameter 800 mm Coating resistance 100 kω/m 2 Length parallism 10 km Offset distance pipeline-overhead line 40 m Overhead line 2 three-phase-systems 380 kv Short circuit current 9.0 ka

17 CALCULATION OF INDUCTIVE INFLUENCE ON A PIPELINE ON THE BASIS OF A MODEL SIMULATION Earthing measures to degrade the pipe to soil potential under 65 V caused by operating currents Pipeline Outside diameter 800 mm Coating resistance 100 kω/m 2 Length parallism 10 km Offset distance pipeline-overhead line 40 m Overhead line 2 three-phase-systems 380 kv System operating currents 1.6 ka

18 SAMPLE CALCULATION COMPUTER BASED

19 SAMPLE CALCULATION COMPUTER BASED

20 SAMPLE CALCULATION COMPUTER BASED

21 SAMPLE CALCULATION COMPUTER BASED

22 TYPICAL EARTHING MEASURE ON HIGH VOLTAGE INTERFERED PIPELINE

23 AC-VOLTAGE LIMITATION DEVICE