Technical Articles

Supplier:

Advanced Protection Technologies, Inc.


Advanced Protection Technologies, Inc. has published these technical articles:

(Surge Suppressors)
From this Article:
Unable to gFollowing is generalized information about design choices influencing SPD safety. As an overview, SPD failures are caused by system level sustained overvoltages. SPDs rarely fail from... (View Full Article)
(Surge Suppressors)
From this Article:
Better SPDs are designed for specific electrical systems, as opposed to one-size-fits-all. The most common application pitfalls involve the electrical system's reference to ground. Below are several... (View Full Article)
(Surge Suppressors)
From this Article:
A Joule is a unit of energy defined as a Watt-second. J= W*s; J=V*A*s. Joules would appear to be an ideal unit-of-measure for SPD. Unfortunately, there are inherent deficiencies addressed below. While... (View Full Article)
(Surge Suppressors)
From this Article:
Surge Standards seem disjointed? Help is here! UL 1449 was revised into UL 1449 Second Edition Revision (Rev 2.5) to include Intermediate Fault Current Testing. This became effective Feb 2007. This... (View Full Article)
(Surge Suppressors)
From this Article:
Some caution should be used in evaluating the EMI/RFI filtering capabilities of a surge suppressor. MIL-STD-220B defines the basic testing procedures and test equipment to be used. However, there are... (View Full Article)
(Surge Suppressors)
From this Article:
The answer is subjective. Reasons for selecting larger kA ratings are one of the most misunderstood concepts in surge suppression. * I have a 100A panel - what size SPD do I need? * My customer has... (View Full Article)
(Surge Suppressors)
From this Article:
Lead lengths affect SPD performance. In simple terms, short and straight leads are better. Most electrical personnel have experienced a power line drop a few volts over several hundred feet. That... (View Full Article)
(Circuit Protection Devices)
From this Article:
Lightning has been the subject of research for decades. The data from this research is available for all to use. A number of institutions have spent many years trying to understand this phenomena.... (View Full Article)
(Surge Suppressors)
From this Article:
APT SPD/TVSS are manufactured and tested in accordance with applicable industry standards. UL Marks are found on APT equipment. These are the most accepted and recognized safety certification marks in... (View Full Article)
(Surge Suppressors)
From this Article:
Multiple pulse or repetitive impulse testing is generally performed using IEEE C62.45-2002 recommendations using waveforms described in IEEE C62.41.2-2002. Often referred to as "pulse life",... (View Full Article)
(Surge Suppressors)
From this Article:
There are several IEEE surge standards in section C62. These address suppression components, outline surge environments, and offer guidance based on the collective input of hundreds of surge... (View Full Article)
(Surge Suppressors)
From this Article:
National Electrical Manufacturers Association (NEMA) may be best known for LS-1, but also serves as a collective mouthpiece for SPD manufacturers relating to other Standards such as UL 1449, IEEE C62... (View Full Article)
(Surge Suppressors)
From this Article:
Many SPDs include noise filtering, also known as EMI/RFI filtering. These filters attenuate higher frequency noise signals on power lines. From an engineering perspective, these are basic, first... (View Full Article)
(Surge Suppressors)
From this Article:
Filtering has become an issue in the SPD marketplace primarily driven by questionable attenuation specifications and testing practices. For example, certain filter attenuations are derived using... (View Full Article)
(Surge Suppressors)
From this Article:
The two most popular surge testing waveforms are described in IEEE C62.41.1-2002, C62.41.2-2002 and C62.45-2002. These waveforms constitute the most commonly and widely adopted means of characterizing... (View Full Article)