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The radiant energy released by an electric arc is capable of permanently inuring or killing a human being at distances of up to ten or even twenty feet. Photo: TestGuy.
Numerous workers are injured and/or killed each year while working on energized electrical equipment.
Many of these workplace injuries are a result of arc flash, a type of electrical explosion that results from a low-impedance connection to ground or another voltage phase in an electrical power system.
When alternating current travels through an electrical conductor, like cable or bus, it develops a magnetic field at right angles to the flow of current. Photo: Wikimedia.
The principal function of a current transformer is to produce a manageable level of voltage and current, proportional to the current flowing through its primary winding, for the operation of measuring or protective devices.
Section 110.16 of the National Electric Code requires a label on electrical equipment that warns qualified persons of potential arc flash hazards if that equipment is likely to require examination, adjustment, servicing, or maintenance while energized.
The cooling classification of a transformer, expressed in letters, designate the type cooling system used.
Heat is one of the leading causes of transformer failure. The main source of heat generation in transformers are caused by copper loss in the windings and core (IČR losses).
If heat inside of a transformer is not properly dissipated, the temperature of the transformer will rise continually, which may damage the insulation.
Hand Operated Transformer Turns Ratio Tester. Photo: MEGGER
There may be instances where mechanical wear or electrical failures can cause a turns ratio test set to be inaccurate or inoperative.
You can verify the performance of your hand-crank TTR by quickly running through the following checks:
1kV Megohmmeter commonly used in the field to test electrical insulation. Photo: Megger
There are three different tests that can be performed with the Megohmmeter. A strong understanding of these common test methods is an important tool in gaining the ability to determine the condition and quality of electrical insulation.
Fire extinguishers are divided into four categories, based on different types of fires. Photo: Wikimedia
Fire in the workplace can be a very dangerous and terrifying experience. Anyone who doesn't know what to do in the event of a fire is not only a danger to themselves but also everyone around them which is why it's extremely important to know these basic fire prevention and safety tips.
