LIGHTNING IS NORMALLY GROUNDED ON WHICH SIDE
LIGHTNING IS NORMALLY GROUNDED ON WHICH SIDE
(OP)
I like to know which side of the Transformer on 13.8 KV /277-280v setup the Lightning Arrester is normally grounded as a standarded practice?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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LIGHTNING IS NORMALLY GROUNDED ON WHICH SIDE
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RE: LIGHTNING IS NORMALLY GROUNDED ON WHICH SIDE
RE: LIGHTNING IS NORMALLY GROUNDED ON WHICH SIDE
The ground side of the arrester (especially if it's 13.8 kV) needs a short, straight path to earth and preferable the transformer tank.
RE: LIGHTNING IS NORMALLY GROUNDED ON WHICH SIDE
RE: LIGHTNING IS NORMALLY GROUNDED ON WHICH SIDE
RE: LIGHTNING IS NORMALLY GROUNDED ON WHICH SIDE
Often the arrestor is located close to the load to be protected.
The impedance of the conductors is typically quite high at the effective frequency of a lightning strike. This impedance helps limit the current and disipate the energy.
With a typical distribution transformer, the lightning protection will be on the primary side of the transformer.
If it is desired to provide protection on the secondary side also, the protector would typically be installed at the panel rather than at the transformer to take advantage of the the impedance of the service conductors.
One pump manufacture markets a surge protector for deep well submersible pumps. These devices are installed in the pump controller at the well head.
Not withstanding the above, check out Cooper Power Systems web site. They have an approach to protecting distribution transformers that I understand includes both primary and secondary protection in the distribution transformer. I don't remember the exact details, check it out.
RE: LIGHTNING IS NORMALLY GROUNDED ON WHICH SIDE
Modern telephone protector blocks under U.S. rules must be bonded to a multigrounded wye primary system that has at least 4 grounds per mile. If local primary distribution is old fashioned 3-wire 3-phase then the building theoretically must have 4 grounding electrodes to make a telephone protector block work.
RE: LIGHTNING IS NORMALLY GROUNDED ON WHICH SIDE
RE: LIGHTNING IS NORMALLY GROUNDED ON WHICH SIDE
Surface tracking.
Failure of the arrestor.
Are we talking about a primary, 13,800 volt arrestor or a secondary surge arrestor installed on the 277/?40 V system?
yours
RE: LIGHTNING IS NORMALLY GROUNDED ON WHICH SIDE
2nd time within 6 months - arcing on the lightning arrestor.
RE: LIGHTNING IS NORMALLY GROUNDED ON WHICH SIDE
yours