Home » Posts tagged 'voltage protection relay 900vpr'
Tag Archives: voltage protection relay 900vpr
New model of power kavach : 3kva with 3 pin socket output
We are looking for dealers all across India to reach out to customers who have faced neutral open and spikes related problems.
Click here To know more about power kavach
Please reach out to us on 9769996205 or email us on Asm@microsystemservices.com
VMC machine PCB damaged inspite of having a stabilizer
We had a case where a VMC machine already having a stabilizer installed for it. However one of PCB was damaged in spite of having stabilizer. This is situation that happened after 4 years of installations. The stabilizer was from reputed make and was in good working condition. The VMC machine is from reputed international make.
Why did the VMC machine get damaged inspite of having stabilizer installed?
A servo stabilizer is voltage conditioner which stabilizes or brings the voltage to set point even if there any variations in voltage in the input. So if you want a stable supply then you will need a Stabilizer
However Stabilizer has 2 major limitations.
1. Response time: If the voltage shoots up to above 300V in any phase, the stabilizer will take atelast 6-7 seconds to cut off the supply to the equipment. In one second 50 cycles of high voltage supply pass in to the equipment and this can damage the equipment. So you need something that can cut off immediately when this happens.
2. Spikes: In a normal day , your equipment faces atleast 100-200 spikes , all of which pass through the stabilizer with out any resistance in to the equipment damaging it little by little. Equipment gets damaged over a period of 4-5 years. Spikes have duration in microseconds and stabilizer cannot react in such a short interval.
Our solution:
The solution we offered was in 2 steps.
1. Equipower- Main line Voltage protector with 20kA spike protection
We offered a 100A Equipower with single phasing preventor for complete premises so that it can handle problem of neutral opn or double phasing. In case of extreme over voltage it will cut off in fraction of seconds thereby saving the equipment from over voltage situation caused by external situations. It also has in built spike protection which prevents external spike from coming into the factory premises. Since there are other factory galas in the industrial estate, there is possiblity of spikes from other premises coming into the factory. So an Equipower at the main incomer helps in solving both of these issues.
2. Spike protection for individual machines
Each individual machine itself generates a spikes of its own and that is experience by other machines. There were several lathe machines and some CNC machines in the factory. Since the CNC machines were critical in nature we placed spike protection units at the individual CNC machines so that spikes from other machine do not enter in the CNC machine and damage the electronic PCBs over time.
3 Solutions for MOV damage problem in Solar inverter
Recently we visited a site where the solar inverter was damaged for third time. Both solar EPC as well as the client were distraught as all remedies had not worked and the solar inverter was damaged again. This is a common complaint by Solar EPC as well as the customers who have got solar power plant installed.
The response by Solar inverter companies was evasive and pointed out to things that are inconsequential and problem repeats after some days or months.
Many solar companies question the make of SPDs, ask for another make of SPD to be installed or ask to have another set of SPDs to be installed. They talk about grounding issues and connection problems. In one of those sites they recommended type 1+2 or class B+C surge protection, but that is something that should have been in place in the first place as the Type 1 responds to lightning impulses and type 2 is not meant for lightning protection. A normal ACDB does not have type 1 surge protection meant for lightning protection.
Root cause of problems -MOV damage
In all the occasions , MOVs ( Metal Oxide Varistors) are damaged. MOVs do not get damaged due to spikes , they merely stop conducting the spikes under normal conditions. MOVs burst is caused by over voltage and is not desirable as it damages the complete circuit and creates an internal short circuit. MOV damage will lead to downtime and brreakdown of machinery which in no way can be termed as voltage protection
If you look in picture above, the MOV rating is 420V and supply voltage is 415V. The voltage recordings for 48 hours revealed that phase voltage reached peak of 460V which is equivalent of 265V in single phase. This happened multiple times in 48 hours and also remained for considerable time – 15-20 mins each time.
SPDs and MOVs respond to spike only. They do not respond to continuous over voltage. If the continuous over voltage is beyond its threshold, like in the case above, the MOV will burst causing breakdown of solar plant.
Our solution for this problem
Our solution was offered as 3 options.
Option 1: Go for inverter with better specification
When we say better specification, we meant with internal MOVs rated for 500V and higher. This is however a bit difficult as the solar inverter companies would normally not disclose this information. Most Solar inverters are white labelled products manufactured in China. So it will also be difficult for them to change the specifications. Also one more problem is about neutral open or double phasing problem that happen on site. In all such situation even 500V MOV would get damaged.
Option 2: Complain to (DISCOM) authorities in documented form
In this option one has to file a written complaint to the DISCOMs and get an inward stamp. Anything that is documented needs to be closed. If not it is a big problem for concerned department. Verbal complaints over the phone are not entertained.
Did you know that as per Indian Electricity rules 1956 the supply voltage should not exceed 6% under normal and 12.5% under extreme situation? Did you know that you could use this as reference and make a big case if you had voltage recordings which proved that voltage exceeded 6%? The DISCOM would be deemed liable for the damages caused by this problem and would be held accountable.
The problem with this option is that it will involve courts and matter could takes months and years to resolve. But considering that you have some strong point here, one can and should take this option
Option 3: Go for voltage protection for solar inverter
This option is the most simplest and no brainer actually. Go for voltage protector with 10% cut off setting. In this case we have our product – Power kavach which can be offered with high voltage setting of 255V on higher side.
Only limitation to be taken in to account is that there will be a generation loss when the Power kavach shuts off the supply in case of over voltage.
There is always limit to courtesy extended by solar inverter or solar EPC. Free service and free replacements cannot be done indefinitely. It is always better to protect your equipment from such problems by using Power kavach
Have you faced similar problems ? Talk to us on 9769996205 or email on asm@microsystemservices.com
Equipower installed at Brigade Cosmopolis, White Field, Bangalore by one of our dealers
This is a home voltage protector installed Brigade Cosmopolis, White Field, for voltage protection of complete home. Installation done by our dealer from banglore, cyneric technolgies
See the list of dealers in your areas
Equipower will protect against neutral open, double phasing, double voltage , 440V in any individual phase for more than 24 hours. It is designed for this purpose specifically.
#Equipower™ is a voltage protector which is connect in your main line and it protects all equipments connected through it. It can easily protect your equipment from voltage as high as 440V in single phase and that is what makes it special
It also acts as an insurance against power fluctuation that could damage your electrical appliances and electronic devices used in your homes and offices .
#Equipower™ protects your electrical appliances and electronic devices against high voltage, low voltage, surges, spikes. However what sets it apart from other protection devices is the ability to protect your equipment in case of #neutralopen and #doublephasing problems.
Most of Equipments deteriorate very quickly after the warranty period. #Equipower™ increases life of equipments and minimizes the risk of damage.
for queries, you contact us on 9769996205 or fill the form below
MSS 