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Participant

Join Date: Jun 2011
Posts: 2

How Do I Select The Proper Surge Suppressor?

06/06/2011 3:22 PM

Hi, I have a valve that is driven by a 208V, 3-phase motor. The FLA is 1.9A and LRA is 6.9A. The valve also has some electronic components and digital display (valve position). I believe we have some power quality issues (spikes) with the utility company and want protect these valves - we have experienced failures of the units during some switching by the utility company. How do I select the proper protection device?

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Guru
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#1

Re: How Do I Select The Proper Surge Suppressor?

06/06/2011 6:30 PM

I would contact the manufacture of the valve assembly for their recommendations.

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Guru
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#2

Re: How Do I Select The Proper Surge Suppressor?

06/06/2011 6:56 PM

I would also contact the power company and find out why they have spikes in their supply and what they are going to do about it.

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Mr.Ron from South Ms.
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Guru

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#3

Re: How Do I Select The Proper Surge Suppressor?

06/07/2011 2:15 AM

Contact a consultant or supplier of SPD to inspect the installation and recommend.

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pnaban
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Participant

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#4

Re: How Do I Select The Proper Surge Suppressor?

06/07/2011 3:11 AM

Hi there, would a 3-phase constant voltage transformer not cure these issues

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Guru

Join Date: Feb 2011
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#5

Re: How Do I Select The Proper Surge Suppressor?

06/07/2011 9:03 AM

I'd have a "whole house" type of surge protector installed. Not one on each load. Protect ALL your electronics not just the motors electronics if you have known spikes in your service.

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Guru

Join Date: Oct 2006
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#6

Re: How Do I Select The Proper Surge Suppressor?

06/07/2011 11:03 AM

Is the motor failing or the controls for it?

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Participant

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#7
In reply to #6

Re: How Do I Select The Proper Surge Suppressor?

06/07/2011 12:16 PM

GW,

The answer is both. 1st time - the motor failed along with the controls. The 2nd time - just the controls failed. I originally thought that the heat from the motor failure caused the problem with the controls, but, motor was O.K. the 2nd time it happened.

Thanks.

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Guru

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#8
In reply to #7

Re: How Do I Select The Proper Surge Suppressor?

06/07/2011 12:41 PM

What is your control?

VFD?

Contactors?

Frequency of operation?

Damage that occurred?

Do you have any pictures?

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Guru
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#9
In reply to #7

Re: How Do I Select The Proper Surge Suppressor?

06/08/2011 12:38 AM

I would definitely get the utilities involved with this and maybe have them compensate you for the lost motor and controls, that's just not right at all. Maybe you guys should pay your utility bills with negative spikes??

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Guru

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#10
In reply to #9

Re: How Do I Select The Proper Surge Suppressor?

06/08/2011 11:43 AM

It may be hard to prove it was a voltage spike. It may be an assumption right now. It would take a power quality monitor to prove that.

I have seen standard controls using just contactors single phase because the contactor did not pull in square and subsequently burn up a mess of hardware. That was even with protection to code requirements.

We have available in our country both IEC contactors and NEMA rated contactors. The NEMA contactors are 2 or 3 times larger, but appear to run for ever compared to the IEC that seem to burn up at the most awkward moments.

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Users who posted comments:

2007woody (1); dj95401 (2); Fredski (1); GW (3); lefty900 (1); pnaban (1); ronseto (1)

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