HOA ?
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| Electrode Configurations - General Discussion https://brainfiller.com/arcflashforum/viewtopic.php?f=8&t=4877 |
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| Author: | Jim Phillips (brainfiller) [ Thu Feb 21, 2019 7:35 am ] |
| Post subject: | Electrode Configurations - General Discussion |
This thread is where general discussions can be held about electrode configurations. |
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| Author: | bbaumer [ Thu Feb 21, 2019 10:14 am ] |
| Post subject: | Re: Electrode Configurations - General Discussion |
HOA ? Attachment: boy-puts-knife-in-plugin-outlet.jpg [ 38.44 KiB | Viewed 81038 times ] |
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| Author: | tmpatton [ Mon May 20, 2019 7:19 am ] | |||
| Post subject: | Re: Electrode Configurations - General Discussion | |||
The IEEE 1584-2018 provides limited examples of the application of the HOA, VOA, VCB, VCBB, and HCB electrode configurations to medium voltage (>1kV and <15 kV) equipment. There are a couple follow up questions that could help clarify the application of the standard. • Can the IEEE committee provide videos of the HOA, VOA, VCB, VCBB, and HCB tests on medium voltage (>1kV and <15 kV) equipment? • If the arc is created on the VCB, could a HCB event occur? • If the fault occurs in the middle of the vertical terminals (as circled in blue below in Figure G.40), would the arc go to the end of the conductive material (representing a VCB arc) or stay at the location that the arc was started (producing a HCB arc)? • If the fault occurs in the middle of the vertical terminals (as circled in blue below in Figure G.40), would the arc go to the end of the conductive material (representing a VCB arc) if the terminals were longer in length? • Based on the description and figures within G.4 of the IEEE 1584-2018, would the application of the standard for HOA and VOA arcs be based on the relative electrode direction (Horizontal electrode configurations – HOA, and Vertical electrode configurations – VOA)? For example in the picture, would a Horizontal electrode configuration be assume as the direction of the energized material is pointing towards the worker/sensor? o Is it reasonable to assume both HOA and VOA are present if the electrode has a bend or has a variety of protrusions/shapes? o How would the equipment manufactures modify the equipment to ensure the arc would go vertical away from the worker?
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