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Would you live in a house with No MCB ? Would you feel safe to live in that house?
Whenever a building is designed, all safety factors are taken into consideration. From electrical installation point of view , the safety factors to be considered are
- Over current
- Over voltage
All of them have to considered from worst case scenario basis, if not then it can cause fires and loss of property, worse.. loss of life.
Generally short circuit is taken care with help of MCBs/ fuse. While MCB/fuse can handle overload issues , short circuit, which is the worst case scenario is also taken care
Lightning protection is generally taken care in high rise building , but the measure taken are incomplete and only from structural integrity point of view as lightning strike on a building will result in structural damage. Lightning rod is installed on top of building and connected to an earthing pit so that lightning pulse can be directed to the ground with out causing damage to building
As the lightning strikes the rod and passes to ground the wire carrying the lightning pulse to ground with gets magnetized. If there is any utility wire which is in the magnetic field of wire carrying lightning pulse, the charge can transferred to the utility cable, this is how normally electronic equipment get damaged due to lightning.
Every on off action of any electrical or electronic device will create a spike. This is how spike is generated inside your house. Dont believe us? Do a small experiment.
- Go to your bath room and switch on the light bulb and now switch on the geyser
- you will notice that the light from the bulb flickers or goes dim.
- now switch off the geyser , you will see that light goes bright again.
- Congratulation!!! You have created voltage fluctuation in your house!!!
The geyser is generally 3000-4000 Watts and it causes voltage fluctuation during its on -off operation. Now imagine the same for other equipment in your home. viz. TV, refrigerator, AC.
So the bottomline is that the spikes are always there in your house. Its not a question of if but when it will damage your electronic items.
Do you have any safeguards against spikes in your home? now that you know that spike are also always there, does it not scare you?
Over voltage protection
The MCBs and fuses are current sensing protection. In a Fuse when the current increases, wire melts in fuse to disconnect the circuit. In an MCB there is bimetallic strip inside it bends due to heat causing it MCB to release contact and make it trip.
If the voltage changes from 230V to 280-290 V, it has not effect on the current and as a result the MCB/ fuse do not react. Your equipment can get damaged by high voltage and MCB / fuse will not react
This brings us back to question ” Are you really protected in your home from electrical problems?”
This is the reason why you should install a home voltage protector.
For more details you can get in touch with me on
9769996205 ( whatsapp no.)
Our appliances are getting smarter by the day. Its a good thing that many companies are energy conscious and are making their appliance even more energy efficient. In India most of home appliance are now made compulsory to have 5 star energy ratings, especially cooling appliances like ACs , refrigerators.
The TV ads are now flooded with ads talking about inverter based ACs, refrigerators. This is great news for energy conservation. However there is rider to all this. These units are susceptible to damages because of power fluctuations.
A traditional circuit consisted of a step down transformer which converted 230V AC to 24V AC which was then fed to bridge rectifier. The rectifier then converted the AC to DC and then it was distributed to the internal circuits with regulator and other component. Even if the voltage increased dramatically the secondary side would experience a relatively low surge on voltage. Prolonged exposure to voltages might have caused damages to internal circuits. In short these circuits were relatively very sturdy in voltage fluctuations.
However transformer has losses. It dissipates a lot of energy in the form of heat. Even in best cases the efficiency possibly didn’t not go beyond 87%, which was problem. Transfomer is bulky. Higher powered (kVA) machines would require a bigger transformer and as result were heavy too.
What we call inverter technology today , consist of PWM inverters and SMPS based circuits, may be even more advanced. These units have done away with conventional transformer based circuit and in effect increased the efficiency. They are also light weight , very compact and dissipate less energy as heat. They also come in attractive housings
However the flip side is that these circuits are now directly exposed to raw power. This is where the new problems have come up. These circuits are having 20% tolerance to voltage fluctuations. This would mean 180V on lower side and 280V on higher side. Seems ok doesn’t it? Wrong!!!
In developing and underdeveloped countries the power conditions are not so good and voltage frequently goes beyond 350V. This is a curse for these inverter based appliances, which get damaged more frequently than their predecessors.
These circuits are not inherently designed for such conditions and since units are manufactured considering global markets which include EU and US. Many white goods brands have made their foray in a new market only to have marred their reputation by service issues. We have many brands making their disappearing act after blitzkrieg of sales and ads.
One can attribute a serious contribution of such factors on making and breaking of brand in Indian conditions. There is probably two options here, either improve the tolerance of the internal circuits or protect the units externally by use of some protection equipment.
Do let us know what you think.
Author: Amit Manjrekar
(Click the image to learn more about him.)
Only protection device for protection against neutral open and double phasing protection
Most of the equipments today are having power supply which can handle fluctuations between 170V to 270V. Also a lot of equipments have built in over voltage protection.
However there are accidental cases where trees fall on over head wires or accidentally neutral opens and resulting fault causes voltage in single phase to shoot upto 440V. The in built over voltage protection of any equipment is of no use , because they get damaged themselves. OVCD is protection device for protection against such problems of neutral open or double phasing.
If you look at the pictures above you can see a typical distribution line problem. There is chance of wire sagging and over head wires touching each other . this can easily cause double phasing condition.
OVCD cuts off the supply to equipment whenever there is such a problem and connects the supply only when the voltage comes back to normal.
It effortlessly withstands voltage fluctuations up to 440 Volts and spikes up to 6000 Volts. It is programmed with a power-on delay of 3 seconds (configurable) for initial surges which are harmful to any other device.
Why should you consider using OVCD before your equipment?
Now you can install your equipment in the worst electrical conditions without being bothered about service calls.
Cost to company if your product breaks down.
|Man power cost||Rs 800||Travelling and per day costof service person|
|Production down time||Rs 1000||Could cost upward dependingthe type of machine|
|Part replacement||Rs 500||Could cost upward|
|Equipment decay||Yes||Reduction of life of equipment|
|Disturbing to business focus||Yes||Significant( both to customersand vendor)|
|Replacement of product||Product cost||Capital Loss|
All figures in Indian rupees
Costs projected are indicative and may vary for product and services
OVCD is connected at before the equipment in use.
Incoming current will first pass through OVCD then into the equipment. OVCD continuously monitors the line voltage.
Whenever the voltage is above or below the set voltage limits the OVCD simply cuts the voltage to the equipment thereby saving it from the line disturbance. It reacts within fraction of second to the disturbance. OVCD will withstand the voltage even as high as 440 Volts.It however does not stabilize the voltage as in the case of other devices in the same category like Stabilizer, CVTs.
When the voltage returns to normal , the OVCD resumes the supply to the equipment with short power-on delay of 3 seconds(configurable). This feature is called the Smart Start. It prevents the initial harmful transient that may damage the Equipment.
How is OVCD better than other power conditioning / protection products?
|Protection up to 440V||
|Under voltage / Over voltage protection||Yes||No||No||No||No|
|Protection from spikes||Yes
|Protection from over load||Yes
|EMI /RFI filters||Yes
Customized to suit your requirements.
We can customize the OVCD in following ways.
End Use application
|UPS||AC drives||Medical Equipments|
|Solar power plants||Compressors||CCTV system|
|Refrigeration equipments||Control Panels||Dish Satellite System|