Timeline for High neutral to ground voltage, and other problems
Current License: CC BY-SA 4.0
15 events
| when toggle format | what | by | license | comment | |
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| Jan 6, 2021 at 20:38 | comment | added | Janka | So my EE diploma was finally worth it. | |
| Jan 6, 2021 at 0:59 | comment | added | JABN | @Janka Your assertions were very true. Finally after almost two years the electricity company fixed the issue, as you indicated they separated the ground connections for both sides of the transformer. Now the neutral to ground voltage is at about 0.4 V | |
| Jan 6, 2021 at 0:48 | vote | accept | JABN | ||
| Jan 10, 2019 at 9:00 | comment | added | Janka | I've edited my answer to reflect the discussion. | |
| Jan 10, 2019 at 9:00 | history | edited | Janka | CC BY-SA 4.0 |
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| Jan 10, 2019 at 8:29 | comment | added | Janka | @WhatRoughBeast: As I understand it, there is one shared ground rod, and that one was orginally intended only for the low currents of the primary side. Then they connected the secondary neutral to ground at the same rod, which is a questionable decision because secondary currents are about 100 times higher. It only matters in case of ground fault, though. | |
| Jan 10, 2019 at 1:50 | comment | added | WhatRoughBeast | @JABN - Wait, wait, wait. So the neutral is tied to the transformer ground tap but never actually connected to ground (dirt)? And you're measuring from dirt to neutral and wondering why you've got a voltage? | |
| Jan 9, 2019 at 23:37 | comment | added | JABN | I will try watering the soil. I forgot to mention that the house is in a tropical pine forest (humid soil and temperatures above 10ºC/50ºF on winter) and it rains somewhat frequently in this season. We have a copper ground rod that electrician did not install (for some reason they chose to connect the house's ground wire to the ground connection used for the transformer), so I guess installing that rod would help with the issue. | |
| Jan 9, 2019 at 23:12 | comment | added | Janka | First, you should try to fix the problem by watering the ground around the grounding rod. Make it a swamp. If that's not possible because of the winter, you could add additional grounding rods, preferably near your house. A ten meters long trench with a steel band in it should do the trick. Keep it all as wet as possible. | |
| Jan 9, 2019 at 23:06 | comment | added | JABN | So having the electricity company install a better grounding rod with a low resistance connection to the soil wil fix the issue? Should they install independant rods for each side of the tranformer or will it work fine the way it is connected with just a better ground connection? | |
| Jan 9, 2019 at 20:47 | history | edited | Janka | CC BY-SA 4.0 |
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| Jan 9, 2019 at 0:38 | history | edited | Janka | CC BY-SA 4.0 |
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| Jan 9, 2019 at 0:33 | comment | added | Janka | The effect of such an operational grounding is within a few metres for the low currents we are talking about. And it's AC. Tramway operational grounding is a real challenge. Crossing iron pipes in the ground just rust away if you do it wrong. | |
| Jan 9, 2019 at 0:29 | comment | added | rdtsc | All the poor Earthworms from point A to point B... | |
| Jan 9, 2019 at 0:23 | history | answered | Janka | CC BY-SA 4.0 |