Did your LED light get damaged?


LED lights damage

Are inverter based equipment sturdy enough for Indian conditions?


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.)

amit

Lightning and surge protection


Surge protection

Surge Protection – a topic that has become increasingly important in recent years as got wide presence across industries. Costly electronic equipment, which is sensitive to voltage peaks on the supply, is no longer found only in offices and factories, but in our homes as well.

Nowadays, highly- sensitive data processing, telecommunication and computer networks form the back-bone of worldwide communications structures without which, no company can survive. Machines and production lines are monitored and controlled by electronic equipments programmed for specific purpose. Even many creative services are no longer conceivable without the aid of computers.
Common to all of them is their dependence on clean electrical energy, within tight tolerance limits and on a continuous supply of power around the clock.

Internal Lightning Protection according to IEC
Lightning current consists of a First stroke followed by a number of subsequent strokes. According to IEC 61024 and IEC 61312, wave shape of the first stroke is calculated to be 10/350 μSeconds.

lightning pulse

Approximately 25 to 30 % of failures in electrical/electronic equipments are because of surges created either by a Lightning or because of switching surges as per the data released by leading insurance companies

power survey

Lightning Peak Current and Frequency of strike:

The maximum value of Lightning current can go up to 200 KA as per IEC 61312 which is in the shape of 10/350 μ Seconds.

Lightning Current Distribution:

According to the standards IEC61024 and IEC 61312, during a lightning strike in a building having an external lightning protection, the lightning current reaches the earth termination. A part of Lightning current goes to earth and remaining part gets coupled into the building through conductive media like Steel reinforcement in Concrete, Earth Conductor Metal Parts connected to earth etc.

lightning distribution

The 100% of lightning energy breaks down as follows according to IEC61312:
–  50% of the lightning current will flow through the ground
–  50% of the lightning current will flow over the connected metal parts of the building (gets coupled into the building)
To protect electrical & electronic equipments inside the building, this 50 % of Lightning current which is entering into the building has to be diverted to the metal parts which is connected from outside. (Metal Water pipe, Metal Sewage pipe, Power lines, data lines etc)

Class B: (Class 1 according to IEC 61643 as well as Class C according to VDE0675)

is an arrester which is designed to carry a lightning current of 10/350 μ Sec duration. Important parameters to be taken care are Lightning Impulse current carrying capacity and Voltage Protection Level (Let through or limiting or clamp voltage)
Class C: (Class II according to IEC 61643 as well as Class C according to VDE0675)

is an arrester which is designed to carry a Surge current in the shape of 8/20 μ Sec. Important parameters to be taken care are Maximum or Nominal Discharge Current carrying capacity and Voltage Protection Level
Class D: (Class III according to IEC 61643 as well as Class D according to VDE0675)

is an arrester which is designed to carry a Surge current in the shape of 8/20 μ Sec as well as tested with a voltage impulse in the shape of 1.2/50 μ Sec. Important parameters to be taken care is Voltage Protection Level

connection diagram SPD

SPD’s are made with Spark Gaps, Metal Oxide Varistors(MOV) Silicon Avalanche Diodes(SAD), Gas Discharge Tubes(GDT) or a combination of these devices
Spark Gaps and GDT’s:

These are called as ‘voltage switching type’ SPD’s. The operating voltage can be determined by the distance between the electrodes. Spark gaps are arresters in which two or more electrodes in series are opposed to each other. The electrodes consist of incombustible material (e.g. carbon or tungsten-copper). Spark gap based arresters used in power line between Line and Neutral should be capable of interrupting the Short Circuit Current (also called as follow current)

GDT

Advantages – It can carry Very Large amount of Surge Current for a long Duration
Disadvantage – Need more time to react (about 100 nano sec), high follow Currents
MOV:

(Metal Oxide Varistors) Varistors are ‘Voltage-dependent resistors’ with a highly non-linear V/I characteristic. Their electrical properties arise from a large number of micro-varistors connected in parallel and in series. The transitions between the micro-varistors can age under the influence of over voltages. Varistors are called as voltage clamping type SPD’s

MOV

Advantages – Faster than Spark Gap (approximately 25 nano sec). Limited current carrying Capacity
Disadvantage – Detoriation after every surge. Can create short circuit after a Maximum discharge current flow

Avalanche Diode:

Transzorb diodes (also known as suppressor diodes) are diodes that limit both positive and negative over voltages. Because of their very fast switching performance (in the picosecond’s region) they are well suited for use in precision and data line protection devices. These are also called as voltage clamping type surge arresters

Avalanche diode

Advantages – Very fast response to surges

Disadvantage – Very low surge current carrying capacity

By using Surge arresters at various zone boundaries, Transient over Voltages created due to a Lightning strike or switching surges can be limited below the Voltage Impulse with standing capacities of the equipments in respective zones.

SPD example

Write to us for more queries on queries@microsystemservices.

Also see

1. Does an AVR or surge (spike) suppressor really protect from voltage fluctuations???

2. How  does Servo Stabilizer work?

3. OVCD

About the Author (Click on the image to visit his LinkedIn profile

amit

Summer is here and so are voltage fluctuations…


Summer ad

Troubled by equipment breakdowns???


OVCD ad1

GLP- Ground Lift Preventor


The problem of Ground lift.

There was a peculiar incidence with a lift during the work of an almost completed multi-storeyed building. The elevator in the building showed signs of malfunctions. There were incidents of elevator buttons not responding properly, stopping on wrong floors. Users were afraid to use the lifts.

The Engineers of the elevator company were baffled by the problem because all systems seemed to be working fine. There was no damaged part, nor the internal logic was wrong. Then they set about looking at grounding system. But even the grounding systems ( Earth pits) were properly done.

They finally found out the issue. There was welding work going on in the building and workers had actually connected the neutral line to Earthing line . Due to this there was lift in ground potential wrt actual ground. This had caused malfunction in the lifts.

Some time there is situations at many sites where two points have different ground potentials. Generally such issues are to be tackled at design stage by means of Earth pits. However some there are sites where such issues crop up even in case of well designed systems. They can also create an electric shock hazard or may be source of noise or interference. This situation is called Ground Lift.

Two ground points at different potential can produce a Ground loop. It there is connection between these two points via any equipment , current will flow and if the current is high then may be hazardous

Ground lift Preventor

GLP is device which senses leakage voltage between neutral and ground and gives a signal which can be given to relay or contactor to cut off the supply to the system thereby saving it from possible damages.

Applications

GLP can be beneficial various areas.

  • Medical equipments
  • Control panels
  • Industrial equipments like CNC machines.
  • Automation equipments like PLC panels
  • Elevators and Escalator

Technical specifications of GLP

System Voltage: 230V AC 50Hz
Supply Voltage range: 180V AC – 250V AC
Supply Current: < 10mA
Auxillary Supply: Not Required
Relay Contact: 5A Potential free. (COM-NO-NC)
Relay Mode:

Relay On at Reset or Power On

Relay Off at Ground Lift

Reset: Auto Reset
Indications: Mains On – Green LED

Grounded – Red LED

Mounting: DIN Rail or Chassis Mounting
Dimensions: 45mm X 76mm X 114mm
Weight:

400gms. (approx)

Write to us for more queries on queries@microsystemservices.

Also see

1. Does an AVR or surge (spike) suppressor really protect from voltage fluctuations???

2. How does Servo Stabilizer work?

3. OVCD

About the Author (Click on the image to visit his LinkedIn profile)
amit

How can OVCD substitute a stabilizer???


In most cases where a comprehensive solution for Power problem is required for any equipment  Let us take an example  of  ATM or any banking requirement.

Generally a combination power protection architecture is a as per below:

             
Isolation transformer + Servo Stabilizer + Online UPS system Your Appln

All of the above equipments are used to solve different aspects of power problem. Let see them one by one.

Isolation transformer:

  • An isolation transformer is a 1:1 (under load) power transformer used for safety.
  • Without it, exposed live metal in the equipment at a hazardous voltage relative to grounded objects
  • Electrical isolation is considered to be particularly important on medical equipment, and special standards apply. Often the system must additionally be designed so that fault conditions do not interrupt power, but generate a warning.
  • Isolation transformers are also used for the power supply of devices not at ground potential.
  • Designed to block interference caused by ground loops

Servo Stabilizer

  •  Designed to automatically maintain a constant voltage level.

Online UPS system

  • Meant for  emergency power backup  incase of power failure.
  • Provides a stable power Supply.

Seems like a foolproof protection system. However in spite of all this there are issues where equipment get damaged. Servo Stabilizer itself gets damaged. Online UPS gets damaged.  There are issues of Down time and service calls for both.

 

 

Double function – a waste

An online UPS is double conversion UPS, meaning that it converts AC –DC (Rectifier charger circuit) and DC to AC (inverter Circuit). So the output of Online UPS is stable irrespective of supply side fluctuations.

It has inbuilt AVR(Automatic Voltage Regulator) system which works as a Stabilizer circuit. It too has operating range like servo Stabilizer 150V-270V. Maximum may be 300V. After this the circuits start malfunctioning. UPS will function properly in this range and will not require a stabilizer.

So essentially Servo stabilizer before an Online UPS is big waste as it does not really protect the Online UPS and UPS will in fact does a better job at stabilizing the voltage levels than a servo Stabilizer.

OVCD – Powerful Alternative

How it works:

  • 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.
  • OVCD will withstand the voltage even as high as 440Volts in single phase . Most equipments get burnt or damaged at this voltage but not OVCD.
  • 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 automatically 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 Stabilizers?

  • Superior protection
  • Occupies less space
  • Lightweight
  • Transformer less design
  • Portable.


 

Comparison with Stabilizer

FEATURES OVCD Stabilizer
Protection up to 440V Yes No
Under voltage / Over voltage protection Yes optional
Protection from spikes Yes No
Lightweight Yes No
Waveform distortion Nil Nil
Response Time Less than 300ms 3 secs
Maintenance Not required Required

Cost comparison.

OVCD is 40% cost effective than any given stabilizer rating.

No price variations on wide range operations. Settings can be custom made.

 

Why should you consider using OVCD before your equipment?

  • Protection against Extreme over voltage.
  • No problems due to voltage fluctuation.
  • Zero downtime
  • Your equipment becomes more rugged
  • Less service calls = Increased profitability + Increased credibility.
  • Better perception of quality of your system in the minds of the customers
  • Increases the chances of repeat sales or referral sales.

USP:

Now you can install your equipment in the worst electrical conditions without being bothered about service calls.


 

Our proposed solution

             
Isolation transformer + OVCD + Online UPS system Your Appln

Why trust us on this solution

  • 15 years of experience in this domain.
  • Over 3.5 lakh live installations all across the country and counting
  • Solution is accepted by many UPS manufacturers like Emerson, Delta, Numeric, Techser, Eaton, GE and many more.
  • We have reduced their service issues related to power problems by more than 75%

Write to us for more queries on queries@microsystemservices.

Also see

1. Does an AVR or surge (spike) suppressor really protect from voltage fluctuations???

2. How  does Servo Stabilizer work?

3. OVCD

About the Author (Click on the image to visit his LinkedIn profile)

Amit Manjrekar
Owner at Micro System Services

Solar streetlight installations in Ratnagiri


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Does an AVR or surge (spike) suppressor really protect from voltage fluctuations???


AVR  means Automatic Voltage Regulation.

What it does is to regulate the mains voltage within a limited range. In the case of your UPS, it boost +12% when the incoming voltage is too low. Let’s say the incoming voltage is at 200 volts, the output then goes to 224Volts, +12% of 200 volts, which is still acceptable for most UPSs. When the UPS output reaches let’s say, 230V with the boost mode on, then the UPS sends a command to a component called relay so that the +12% compensation is turned off.

Basically the voltage regulation is a series of power transformers, it can either be step-up transformers or a step-down transformers  They basically do the same thing a 220V to 110V step-down transformer does, or a step-up transformer does, when it gets 110V and transforms to 220V. The UPS senses the incoming voltage and commands a series of relays  to select a different transformer output or “tap”, as they call it.

An automatic voltage regulator can only work within a limited range. Their “taps” are at a fixed rate lets say, +10volts. If the UPS have a 12% voltage trimming option and the incoming voltage reaches 270 Volts, it can only trim 12% of that, which will result in 237 Volts.

Voltage regulator transformer can have as many “taps” as its developer wants, but it makes the unit much heavier, it wastes more energy and generates more heat. It doesn’t matter if the AVR has four “taps” or sixteen taps, it is still slow for suppressing voltage surges
Surge suppression is basically made to protect against high energy and fast rising surges or spikes that can be caused by lightning, electric motors being turned on or turned off, etc. Surges are essentially fast rising spikes and voltage swells are slow rising and low energy in nature. Surge suppression can in some cases reduce voltage swells, but this is not its main purpose.
Surge protection is basically comprised of a component called MOV – Metal Oxide Varistor.

An MOV works at diverting surges to ground. When operating at its nominal voltage, or the mains voltage, the varistor acts like a resistor with its resistance tending to the infinite, so it does not conduct electricity to ground at this state. When there is a fast surge, it instantaneously reacts (in nanoseconds) by decreasing its internal resistance, allowing the excess energy to flow to ground.

The voltage regulator cannot act as fast as an MOV for suppressing high power and fast rising surges and would not be capable of that because of the nature of a power transformer. High energy surges must be diverted to ground and power transformers do not do that. Compared to the speed of an MOV, the voltage regulator is like a turtle.

There are some disadvantages regarding the use of MOVs for suppressing voltage swell. MOVs degrade very fast if frequent voltage swell are imposed to it, it gets too hot and it’s internal chemistry degrades. MOVs are made to react fast and come back to it’s initial state very quickly as well, which happens when a power surge occurs. That’s why manufactures of surge protective devices use an MOV that only triggers itself when the voltage is much higher than the mains voltage. If the MOV starts to conduct too early, it will degrade itself very quickly and on all power grids a relatively high number of fast duration swells, do happen

What an MOV doesn’t do…

An MOV does not provide equipment with complete power protection. In particular, a MOV device provides no protection for the connected equipment from sustained over-voltages that may result in damage to that equipment as well as to the protector device.

An  MOV provides no equipment protection from inrush current surges (during equipment start-up), from over current (created by a short circuit), or from voltage sags (also known as a brownout); it neither senses nor affects such events.

Susceptibility of electronic equipment to these other power disturbances is defined by other aspects of the system design, either inside the equipment itself or externally by means of  a circuit which typically consists of a voltage-sensing circuit and a relay for disconnecting the AC input when the voltage reaches a danger threshold. See OVCD).

In nut shell…

The AVR and the surge suppression solve two different problems. They’re complimentary technologies but do  not ensure total power protection.

The AVR can adjust the voltage of the line within a limited range to compensate for the voltage being too high or too low. However, the AVR does not respond quickly enough or have wide enough compensation to handle surges.

Surge protection is capable of putting huge surge voltages into ground very quickly, but won’t adjust the long-term voltage of the line as the AVR does.

Both however are ineffective against sustained high voltages. in neutral open condition , they themselves will need protection.

Please do give us your feedback

For more queries write to us on queries@microsystemservices.com

 

Also see:

some facts about over voltage

Over Voltage cut off Device

How to protect your equipments from extreme power fluctuations

 

 

Effect of Supply variations on different types of Equipments


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