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

Monday, May 05, 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.
  • 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.

Wednesday, August 17, 2011

CIPCO Energy Library - Electrical Study

Presented in a Easy to understand, layman language. This Energy and Electrical Basics is a must for all who want to save power and lead a Green Lifestyle.
Undertand your Appliance and The Energy Supplier. The way electricity is generated and reaches your home.

CIPCO Energy Library - Electrical Study

A class in basic electricity and how the electric utility industry generates and delivers power to customers. Designed primarily for use by utility field representatives who need to understand electrical principles.

Fundamentals of Electricity Covers the subject of motors from an explanation of how they work, to the advantages/disadvantages of adjustable speed drives, see Motors & Drives section.
Complete descriptive information on closed- and open-loop geothermal heat pump systems. Residential, multifamily and commercial applications are all covered. - Geothermal Heat Pump Systems

Sunday, June 05, 2011

Uninterrupted Power Distribution for Homes

The Enhancement of Mains power system for Homes and Small Business is critical. The population is more now and the use of electricity for more appliances becomes inevitable, this makes power shortages imminent.

Power Electronics & Solar Energy

The power to Homes can be distributed by two types of phase lines (live), a common neutral and the usual earth. High Phase is for Heaters and Motors and some lighting too. This phase can be shut down on power failure, load management or over use. The other is the Green Energy line, a low current phase which never fails! It is used only for lighting and small and light electronic appliances. It is a limited energy line.

"Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight, wind, rain, tides, waves, and geothermal heat. Renewable energy often provides energy in four important areas: electricity generation, air and water heating/cooling, transportation, and rural (off-grid) energy services."


That means, so much kWhr for a month, beyond which the line will trip off for the month. This Green Line is augmented by solar, wind or tidal electricity. That way this Green Line is Uninterrupted, but Energy Limited. This will bring a sense of responsibility on the consumer, who will plan the usage of his Green Power Line carefully.

The other High Phase raw line can go off due to Black-out and Brown-outs, when there is a shut down or load balancing. This can also be energy limited at a higher threshold, depending on the number of people in the small business or home. Big Companies have their own Mini Power stations to manage the Power problems, Here also a Green Line can be provided in addition to the mini power stations.

The sensible and frugal, energy consumer can depend on his Green Line to manage his office or home, with no interruption of power. All Home users, Commercial Establishments, Factories and Companies have to become responsible, frugal and austere in the consumption of both electricity and fossil fuels. This not only saves the costs for the company, but the society (read customers) which is the environment they depend on, is also sustained.

Happy Healthy People means more Customers/Consumers, that implies Economic Growth and a Vibrant/Resilient Stock Market.

Power Electronics shows the way - Power Electronic Circuits.

delabs Notes around 2006

Contents

Basic Electronics
Basics of Electronics
Product Production
Work Discipline
Testing Points
Learning Electronics
Electronics Theory

Production Notes
Prototype Fabrication
Electrical Circuits
Electromechanical


Library
Scots Guide Electronics
Engineering - Wikibooks
Design Lab - Jim Svoboda
DC Circuits UOG
Socratic Electronics
Blobz Guide Electric Circuits


Product Design
Product Development
Constant Current Source
Good Voltage Regulators
Insulation Resistance
Digital Insulation Tester
DN Schematic PCB 04
DN Product Design 07


Hobby Circuits
VU Meter Circuits
LED brightness control
555 Incredible Chip
Process Control
liquid level measurement
Thermocouples and RTD
Design ADC Interface uC
Thermocouple Amplifier
IA Instrumentation 02
Temperature on DMM
Optical Proximity Switch
Analog Mux - Data Acquisition


Test Measurement
Instrumentation Automation
NI Test and Measurement
DMM Digital Multi Meter
Oscilloscope in T&M
IA Automation 01
Build Instruments
Tektronix T&M Equipment
Educators Corner – Agilent


Power Electronics
UPS Background
Transformer Connections
DN Power Electronics 03
DN Power Electronics 02
Half Bridge Convertor SG3525


Embedded
Interfacing Microcontrollers
Embedded Process Control
80C31 8052 Microcontroller
Microprocessors and uC
Embedded Systems Design

Components
Good Voltage Regulators
Relays and Contactors
Potentiometers Trimpots
Prototype Boards Types
Types of Capacitors
Types of Switches
Resistors How they Work
Coils Transformers SMPS
Mains Transformers Types
DN Components Selection 05

Tutor Gadgets
Count-Up Timer
Digital Logic Gates
Electronics Tutors

History
Teaching Instruments
Charles Proteus Steinmetz
Muntzing a Circuit Design
Teralab Electronics projects
Historical Instruments


Tables, Charts, Videos
Binary and Hex
Resistor Color Code
Ohms Law
Giga, Tera, Pico, Nano
High Resistance Materials

Analog
School - Analog Design
DN Analog Basics 06
DN Op-Amps 01
TI Semiconductors