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Transformer Basics
Electrical transformer basics, how electrical transformers work, electrical transformer installation and maintenance.
Transformer Installation Made EasySort of
OK, it won't be easy, but these five steps will help your next transformer installation run more smoothly. Installing transformers in accordance with the NEC is critical to ensuring a safe electrical installation as well as a reliable power supply system especially for those applications where power quality is an issue. The installation of transformers is one of the most common, yet complicated installation
Guidelines for transformer application designs.
You must evaluate various factors when choosing a transformer so that it meets both the needs of the load and the application.The time you spend in selecting a transformer seems to be in direct proportion to the size of the unit. All too often, small transformers are selected with just a cursory look at the connected loads, and frequently a decision is made to choose one with the next larger kVA rating
Sensible transformer maintenance.
Correct interpretation of maintenance data from transformers is vital for increased reliability, long life, and advanced information on possible need of replacement.Information accumulated through routine inspections and periodic tests on transformers in operation will usually provide you with a warning of approaching service problems. Then corrective measures can be taken. More importantly, if the
Sensible transformer maintenance. (part 2)
Following specific checking and maintenance guidelines as well as conducting routine inspections will help ensure the prolonged life and increased reliability of a dry-type transformer.Because dry-type transformers are used so extensively in industrial, commercial, and institutional power distribution systems, their maintenance should be a top priority. As such, you should have a thorough knowledge
Overcoming Transformer Losses
A more efficient transformer can pay for itself many times over during its 25-year lifespan The transformer plays a key role in an electrical system’s efficiency and power quality, yet 95% of buying decisions are based solely on first cost. Buying based on life cycle cost would save literally hundreds of thousands of dollars in operating losses over the installed life for transformers in a typical
Transformer Installation Basics
You must power a new office in Warehouse 5. To do this, you need a 3kVA transformer (277V single-phase to 120V, 2-wire) for lighting and a receptacle for the coffeepot and computer terminal. So how do you connect the transformer?Within the junction box, the
Transformer Secondary Conductors
Similar to feeder taps, covered in the last issue, transformer secondary conductors can be every bit as confusing. Let's take a closer look at 240.21(C) to help clear up any misconceptions. Basic rules As with feeder taps, you can't use the rule provided in 240.4(B) for any transformer secondary conductor. Normally, you can use the next highest overcurrent protective device (OCPD) above the ampacity
Choosing Transformers for Power Distribution Projects
Follow these basic steps to select the best transformer for each phase of your next project. Suppose you've got the job of designing the power distribution for an entire building. At some point, you'll have to select the service transformer and the distribution transformers. How do you select the right transformer? Let's answer that question, beginning with the service entrance. First you must determine
Knowing liquid-filled transformer installation requirements.
Knowing NEC, NESC, insurer, and listing agency installation requirements will help you select the best type of insulating medium for the application.Increasing concerns over fire safety in and around buildings can result in questions about transformer installations, specifically for liquid-filled transformers. Also, installation requirements per the National Electrical Code (NEC) and the National
Electrical Transformers Archive
Electrical Transformers Archive
Analyzing transformer insulating fluid.
As part of a complete preventive maintenance program, periodic oil analysis will monitor the condition of power transformers and detect problems before they reach serious proportions.Power transformers are a vital link in the transmission and distribution of electrical power. In fact, almost every business, whether industrial or commercial, relies on transformers for its electric power supply. Since
Unconventional Transformer Connections — Part 3
Using ordinary single-phase transformers in unusual applications can have extraordinary benefits. We'll examine three more configurations here. Case Eight: Zig-Zag Autotransformer (ZZA). A steel building (under construction) has a temporary 480V, 3-phase, 3-wire feeder for welders and general power. Unfortunately, the contractor encloses the facility without windows, before the busduct feeding the
Unconventional Transformer Connections — Part 2
Part 1 showed us how to use unconventional transformer configurations to resolve equipment availability problems and unusual circumstances. Part 2 provides more examples, and a look at the tradeoffs involved. Let's begin with Case Five. Case Five: Open-delta/open-wye connection (OD-OY). A fabrication shop acquired a lathe with a European programmable logic controller (PLC), powered by a 480V/240V
Unconventional Transformer Connections — Part 1
Sometimes, budget constraints keep you from buying a new transformer for a specific application. You already have a boneyard of transformers; can you make do with what you have? In many cases, the answer is yes. Designers and installers sometimes configure transformer banks from single-phase devices and apply non-standard connections. You can use these unconventional methods to adapt distribution-system
Guidelines for installing transformers - Part 2.
The successful operation of a transformer is pendent on proper installation as well as on proper design and manufacture. Part 1 of this article, which addressed installation procedures that are common to both dry- and wet-type units, appeared in the June '96 issue of EC&M. This article covers installation procedures peculiar to dry-type transformers as well as those relating to fully assembled liquid-filled
Silicone Transformers Improve Fire Safety
Consultants specify liquid silicone-filled transformers at media manufacturing plant to increase efficiency and improve fire safety of this power delivery system. When the San Francisco, Calif.-based engineering group Keller & Gannon specified silicone transformer fluid for six units installed at the new MMC Technology facility in San Jose, efficiency, low noise levels, and fire safety topped their
Superconducting Transformer (HTS) Successfully Tested
Is this experimental unit the most powerful superconducting transformer constructed to date? It’s already bringing sweeping changes to transformer and substation design. A U.S. industry team of engineers and scientists, led by Waukesha Electric Systems (WES), announces an important breakthrough in electric technology by successfully testing a large (1MVA) experimental version of a new type of power
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