Pre-commissioning electrical tests for overhead powerlines
Pre-commissioning electrical tests for overhead powerlines
(OP)
Hello Everyone.. what are the typical re-commissioning electrical tests for overhead powerlines? I understand for long distance HV (230kV and higher) you would normally perform phase sequence/rotation check, sequence impedance tests, conductivity tests and footing resistance tests. My question is there any merit to do all these tests on medium voltage lines like 34.5kV , except footing resistance tests?
RE: Pre-commissioning electrical tests for overhead powerlines
user Marmite in the thread below has a great tip. Energization through a protective device that is fault make/break rated. On distribution voltages the use of a recloser with the ability to soft reclose may be beneficial.
https://www.eng-tips.com/viewthread.cfm?qid=191559
RE: Pre-commissioning electrical tests for overhead powerlines
I am interested in what kind of sequence impedance checks and conductivity checks you are thinking of. As far as I was aware, measuring sequence impedance is very cutting edge stuff using PMU data from both ends of an energized line.
RE: Pre-commissioning electrical tests for overhead powerlines
RE: Pre-commissioning electrical tests for overhead powerlines
Re-commissioning tests on overhead medium voltage (MV) power lines typically include:
- Continuity tests: This test verifies the electrical connectivity of all conductors, including the ground wire.
- Insulation resistance tests: This test measures the resistance between each conductor and ground, which provides an indication of the overall insulation health of the system.
- Ground resistance tests: This test measures the resistance of the ground wire, which is an important safety feature that protects people and equipment from electric shock.
- Line impedance tests: This test measures the impedance of the power line, which helps to identify any potential load balancing or power quality issues.
- Phase balance tests: This test verifies that the voltage and current levels on each phase are balanced, which helps to ensure that the power system is operating efficiently.
- Voltage drop tests: This test measures the voltage drop along the length of the power line, which can help to identify any areas where the voltage may be too low, which could cause equipment to malfunction or fail.
- Power factor tests: This test measures the power factor of the system, which is a measure of how effectively the power is being used. Low power factor can indicate that the system is not operating efficiently, which can lead to increased energy costs.
- Voltage and current waveform tests: This test measures the shape and stability of the voltage and current waveforms, which provides valuable information about the power quality and stability of the system.
While footing resistance tests are typically not performed on medium voltage power lines, it's important to consult with the power company and relevant standards to determine the appropriate tests for your specific situation.https://www.asutpp.com/
RE: Pre-commissioning electrical tests for overhead powerlines