Showing posts with label Energy-Power. Show all posts
Showing posts with label Energy-Power. Show all posts

Wednesday, June 04, 2014

UPS Power Inverter and DC to AC

Learn about Power flow, Sags, Dips, Phase rotation, Harmonics, Flicker and more!

Power Quality Teaching Toy

Power Quality Teaching Toy

Standards

CBEMA - Computer Business Equipment Manufacturer's Association adopted curve IEEE Standard 446 (orange book) curve. Recommended Practice for Emergency and Standby power systems for Industrial and Commercial Application."
  • Wave form Sine wave THD (total harmonic distortion) maximum 5%.
  • 3 Phase system phase imbalance of voltage 3% - 6%.
  • Frequency stability 60  +/- 0.5Hz.
  • Output Voltage +6% Max. -13% Min. from Nominal Value.
  • Voltage can fall to 0V but should recover in 0.5 Cycles.
  • On turn on Voltage should reach steady state within two seconds.
  • Upto 200% over Nominal Voltage should be tolerated for 100uS. ( Transients, spikes and Inductive Kickbacks come in this)
  • Upto 30% over Nominal Voltage should be tolerated for 0.5S.
ANSI - American National Standards Institute

"Standard Voltage Ratings for Electrical power systems & Equipment"
  • Steady State Variations +/- 5% of Nominal Voltage. T
  • Three Phase Voltage Imbalance 5% Max..
  • Standard Frequency 60Hz.
Glossary
  • Frequency 60Hz Hz is Hertz.
  • One Cycle = 20mS (milliseconds) one full sine wave.
  • Standard Frequency is 50Hz in many countries.
  • Max - Maximum
  • Min - Minimum
  • uS - micro seconds, S - seconds.
Cause of Transients
  1. Switching Loads Simultaneously (inductive loads).
  2. Power factor correction capacitors and devices.
  3. Lightning strikes (enhanced by earth faults).
  4. Line Inductance (inductive kickback, resonance).
  5. DC and AC Drives for Motors.
  6. Rectifiers with large filters and stray inductance.

CBEMA Guideline
The CBEMA guideline, created by the Computer Business Equipment Manufacturers Association is a realistic, at-the-equipment, maximum allowable voltage that equipment can withstand, without damage or upset.

Tuesday, March 18, 2014

Earthing Practice and Power Quality

"Earth leakage currents arise mainly from the EMC filters built into electronic equipment with switched mode power supplies. Standards limit the leakage current from non-fixed equipment (i.e. equipment that plugs into a standard socket outlet) to less than 3.5 mA. When a lot of electronic equipment is in use, the total leakage current in the protective conductor can become significant."

Earthing Practice by Trevor Charlton
  • Methods of Earthing
  • Earth Conductors
  • Electrical interference
  • Lightning Protection

Earthing Practice and Power Quality

Power Quality and Utilisation Guide

The PQ E-library is a collection of electronic technical reference documents covering introduction, costs, harmonics, resilience, voltage disturbances, earthing, energy efficiency and renewables/distributed generation. See also - Power Quality

Copper Development Association
  • Educational Resources
  • Computers cannot work without copper
  • Electricity in buildings
Copper Development Association Website for information on Copper and Copper Alloys

Copper Development Association - Resource Library

Copper Development Association provides a range of resources in support of the correct and efficient use of copper and copper alloys for major applications.

Monday, March 04, 2013

Technical Resource - Marc Dekenah

Useful resource on Power Quality, Radio Telemetry, T&M and Interfacing.

Technical Resource - Marc Dekenah

Economical Impulse Generator, Measuring in Excess of 1kV, "Soft Earthing" Instruments and A Real LAN twist cable are pages you must read.

Marc's Technical Pages; knowledge-base of Faultlink International, an independent electrical / electronics fault investigation & analysis consultancy.

Marc is an independent electrical/electronic fault investigation and analysis consultant with over 25 years of industrial electrics/electronics experience as Consultant, System Engineer, Technical Director, Design Engineer and more.

Connecting Up For Intermittent Nuisance Trips

Connecting Up For Intermittent/Nuisance Trips

"Intermittent trips are circuit breakers rightfully operating because of an unknown cause or fault. Nuisance trips are a breaker deeming a non-existent fault has occurred and, in so doing, operates without need."

"Faultlink International is a fully independent broad-range electrical/electronics fault investigation and analysis consultancy."

FaultLink International - Electrical Power Diagnostics

Monday, October 15, 2012

Integrated Device Technology - IDT - Semiconductors

Leadership in digital technologies, coupled with its in-house analog capabilities. They have solutions for Computing, Communications and Consumer Electronics. They Streamline data transmission and data-communication in the Networks.

Integrated Device Technology - IDT - Semiconductors

The Product Line includes Clock / Timing Devices , Display / Video Solutions, Memory Interface Products and SRAMs. For Small Computing devices there are Touch Products, Processors and USB/PCI Express Chips. They also manufacture RISCore 64-bit Processors for large computing systems.

DAC1653Q-DB High-Performance 16-bit Quad DAC

DAC1653Q-DB High-Performance 16-bit Quad DAC

"The DAC1653Q-DB evaluation board features the DAC1658Q high-speed quad channel 16-bit DAC with high common mode voltage. The DAC1653Q-DB evaluation board is suitable for dynamic performance evaluation from low to high output frequency configurations."

Founded 1980, Corporate headquarters in San Jose, California.

Integrated Device Technology - IDT - Semiconductors
6024 Silver Creek Valley Road, San Jose, CA 95138, United States.

Wednesday, October 12, 2011

EMerge Alliance - Safe Low-voltage Power

EMerge Alliance - Safe Low-voltage Power
"The EMerge Alliance was established to promote the rapid adoption of safe, low-voltage DC power distribution and use in commercial building interiors."
 Promoting adoption of Safe Low-voltage DC Interior Power Distribution.
Highlights
Occupied Space: The first available EMerge Alliance Standard creates a 24-volt DC microgrid for use in commercial interiors, featuring safety and flexibility along with efficiency benefits. See Registered Products.
Data Centers: A 380-volt DC power standard focused on data center and telecommunication applications is under development. View Presentation.

EMerge Alliance 24 volt DC power system demo at Greenbuild 2009. Demo features ceiling grid, lighting, sensors and controls

Tuesday, October 11, 2011

Electrical Safety and Clean Power

This is an educative and important guide for Electrical Equipment Safety. This can be also applied partially to Power Electronics and Home Energy Systems. Electronic Equipment also have to be maintained by Calibrating them and protecting them from environmental parameters like dust, grime, direct sunlight, moisture, humidity, sea wind (brine), corrosive fumes and chemicals. They should not be even placed near machines like a big lathe, sub-sonic or low frequency vibrations.

Electrical Safety Testing Reference Guide

Electrical SafetyElectrical Safety is a Serious Issue Electrical Safety in the workplace is the most important job of an electrical worker. No matter how much training one has received or how much employers try to safeguard their workers, Electrical Safety is ultimately the responsibility of the electrical worker.

Electrical Safety Hazards Handbook

Power Studies, Arc-Flash Hazard Labeling, Data Gathering and Inspection, Engineering Services.

The steps to osha electrical safety

Electrical Design, Lighting and most important Earthing or Grounding. Good Reference Articles and Product Reviews.

Electrical Construction and Maintenancee Power Quality, National Electric Code, Construction, V/D/V, Ops, Equipment Rental Industry Resourc

Earthing or Grounding is something Audio Enthusiasts make a lot of fuss about. The Articles here about Balanced Power, Symmetrical Power Systems and Earthing throw light on ways to counter Audio Noise.

Clean PowerAC Power has the 50/60 Hz noise, now more AC noise can be picked up by poorly designed systems when so many gadgets around. These articles are also relevant for the instrumentation engineer. Dissonance is encountered when you build sensitive strain gauge based measurements or while measuring and transmitting micro-volts from a remote sensor to the dashboard/control panel.
Index of Technical Articles About Balanced Power

International leader in electromagnetic compatibility (EMC) and power quality (PQ). EMC Filters, RFI Suppression Chokes, Feedthrough Components.

Schaffner - EMC/EMI components, harmonic filters & magnetic components.

Schaffner - electromagnetic compatibility

Friday, November 05, 2010

Ember - Wireless Semiconductor Solutions

Ember's ZigBee wireless networking systems - chips, software and tools - enable Energy Technologies - enertech - help consumers, businesses and utilities to better manage energy resources, save cost and preserve the environment.

Ember - Wireless Semiconductor Solutions

Ember offers the industry's most advanced, complete and integrated ZigBee system - including chips, software and tools.

EM35x System-on-Chip - Ember

EM35x System-on-Chip (SoC)

The EM351 and EM357 SoCs are tightly integrated with EmberZNet PRO, a ZigBee compliant mesh networking software which is the most deployed ZigBee platform in the market..

(This post has been corrected 2012,  Ember appears to be part of Silicon Labs.)