Friday, October 14, 2016
Mains Voltage and Power Circuits
Single phase Supply in layman language means a Live, a Neutral and an optional earth. The earthing is a must in every building along with lightning protection. The Neutral is a close to earth potential, The live can give a shock to a man who is in contact with earth at some part of the human body. So great care has to be taken. This live wire or point can be easily checked by a quality standards approved Neon Tester.
Three phase supply - there are three Live wires, used in factorys and apartments to power bigger loads and Motors. A 3 phase AC motor is very efficient and economical and most machines like Drills and Lathes are powered by AC Motors. 3 phase supply becomes essential for industry.
The voltage is transmitted and supplied to houses at a high level in comparison to low level of batteries. This High Voltage is not safe but Inevitable, as transmitting at lower voltage means greater current carrying requirements of wires and connectors. That leads to more copper or aluminum usage, more wastage of power due to I2R.
Earthing has to be good, use a Earth Leakage Trip Device. If earth wire gets snapped outside and some appliance is leaking, the metal clad appliances may give shock. Even if no appliance is leaking, the current thru y-capacitors of EMI Filters in Electronic Gadgets like computers are enough to make your Neon tester glow.
The Circuits related to Mains Power
Monday, March 21, 2016
Earthing Practice by Trevor Charlton
- Methods of Earthing
- Earth Conductors
- Electrical interference
- Lightning Protection
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 - 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.
Thursday, September 08, 2011
Electromagnetic interference Wiki
Vertical polarized VHF- UHF biconical antenna
170 – 1100 MHz with omni directional H-plane pattern
Who would know better about Radio Frequency Interference and ElectroMagnetic Interference more than the Hams or Amateur Radio Community.
If they have to communicate effectively using limited resources, they have to deal with EMI/RFI effectively, While they build their equipment or combat Noise from other Machines and Installations nearby.
This problem needs more practical involvement and experimentation to learn, compared to learning something like Digital Electronics.
Equipment and Electricals like SMPS, AC/DC Drives, Motors, Solenoids and CFL Lamps are to be built/reinforced for low EMI/RFI emission/radiation.
Sensitive Medical Equipment like ECG or even a Aircraft can be seriously affected by Noise.
Radio Frequency Interference (RFI)
Thursday, August 04, 2011
To make an analog design using log amps or multipliers, discovercircuits - four-quad is good for learning. Using a uP for math is better. Look at these links below. Build a Power Meter ! The Metrics for Going Green is with a Energy/Power/Watt meter.
Monday, June 02, 2008
Sometimes it is Accuracy that can get affected, but some electrical jolts can damage or desensitize fine sensors or positioning systems.
On the right you can see a Filter that i used to make long ago, This is connected in series with an Existing Mains Chord. It can also be Fixed in a Control Panel with a Clamp. One Y cap is Missing in this Piece. The Big one must be the X cap a higher Capacitance Value. The Y cap is Lower Value and withstands around 1kV, It is better if X cap is AC 440V.
- eEngineer - Electrical Engineering, EMI/EMC, RFI
- EMI Shielding RF Shielding
- Dealing with Computer generated RFI/EMI
- WEMS Electronics - EMI Filters / RFI Filters
- TDK - Electronic Components & Materials