×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

*
*
*
*

Thanks. We have received your request and will respond promptly.

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

HVDC Warning Indicator

thread797-491212

HVDC Warning Indicator

HVDC Warning Indicator

(OP)
I am looking for a way to indicate danger in a HVDC (80-1,000 VDC) junction module when dangerous voltage is present even when the machine is shut down. The system I am working with can have stored voltage of up to 1,000 VDC. I am thinking that I could use an LED that is connected to the HVDC through a current limiting resistor that would stay on down to about 40-80 V and then go off.

My constraints in order of importance are 1. space efficient, 2. simple, 3. cost effective.

So far for this I have used a DC/DC Converter to drop the 80-1,000 VDC down to a regulated 12 VDC to power a TruMeter Voltmeter. It has been working well, however, this method meets none of my constraints.

Thank you in advance for any suggestions!

RE: HVDC Warning Indicator

An LED would require 5 to 10mA of current for typical brightness. Means you will need minimum a 5 to 10W power resistor. Doesn't have to be an LED. You could use a good old-fashion neon bulb. They will light well with 500uA current. So you would need more like two 1 Meg 1/2W resistors in series. Once the 1000V excites the neon, the current will flow, and the bulb will remain ON as the voltage drops.

You could begin experimenting with a typical 115VAC neon pilot lamp. These usually contain internally a 220K to 270K resistor in series. Just add more resistors in series. A single typical axial 1/2 resistor should not be used at more than 500V which is why I suggest several in series.

RE: HVDC Warning Indicator

(OP)
Thank you Comcokid! I am going to order some components and try bread-boarding this.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login

Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now
Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close