Author Topic: Best way to discharge capacitors ?  (Read 2145 times)

Offline Teslaliveson

  • High Voltage Enthusiast
  • *
  • Posts: 1
  • Karma: +0/-0
    • View Profile
Best way to discharge capacitors ?
« on: March 13, 2017, 09:37:24 AM »
 I have a few projects coming up involving capacitors in their circuitry  and during my research i have found several ways of discharging them. My question is what is the best way to make a reusable tool so to speak for discharging that is durable. I know a screwdriver can be used to short circuit them but thats not a great idea in my mind for several reasons. I have seen led's and bleeder resistors but is their perhaps a hand held tool that can be made to bleed them instantly and safely ? :o

Offline futurist

  • Global Moderator
  • High Voltage Technician
  • *****
  • Posts: 167
  • Karma: +5/-0
    • View Profile
Re: Best way to discharge capacitors ?
« Reply #1 on: March 13, 2017, 03:07:12 PM »
You'll damage the caps by shorting them if they are not designed for pulse discharge (and most of them are not)

If you don't plan to use fixed bleeder resistors you can hook up some alligator clips to make portable bleeding resistor

Offline Mads Barnkob

  • Administrator
  • High Voltage Expert
  • *****
  • Posts: 1744
  • Karma: +42/-0
  • Denmark
    • View Profile
    • Kaizer Power Electronics
Re: Best way to discharge capacitors ?
« Reply #2 on: March 13, 2017, 10:13:37 PM »
Install bleeding resistors! Safety first!

Also have a two factor voltage indication, like both a analog meter, but also neon lamps/LEDs around the circuit to indicate voltage at a certain level, it is always a good idea to have more indicators or fail safe circuits.

I wrote about bleeding resistors here: http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/dc-bus-capacitor/ and with the link there is to the capacitor discharge calculator you can check if the curve is falling too fast, if voltage sharing is a greater design issue etc.
https://kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics
https://www.youtube.com/KaizerPowerElectronicsDk60/join - Please consider supporting the forum, websites and youtube channel!

Offline MRMILSTAR

  • High Voltage Engineer
  • ****
  • Posts: 281
  • Karma: +8/-0
  • Cedar Rapids, Iowa
    • View Profile
Re: Best way to discharge capacitors ?
« Reply #3 on: June 15, 2019, 05:49:12 PM »
Even pulse discharge capacitors have a maximum current specification. I cracked the plastic case on one of my Maxwell 37667 pulse caps due to an accidental flash-over between bus bars and it had a maximum current rating of 25,000 amps. I use bleeder resistors. After everything appears to be discharged by the resistors, I then follow that up with a chicken stick across the bus bars.
« Last Edit: June 16, 2019, 05:33:05 PM by MRMILSTAR »
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

High Voltage Forum

Re: Best way to discharge capacitors ?
« Reply #3 on: June 15, 2019, 05:49:12 PM »

 


* Recent Topics and Posts

post Re: LCR meter recommendation
[Sell / Buy / Trade]
the_anomaly
Today at 07:16:17 PM
post Re: OpenTheremin v3 loosing calibration after minutes
[Electronic Circuits]
petespaco
Today at 05:38:29 PM
post ZVS long cable freq stabilization
[Transformer (Ferrite Core)]
kreasteve
Today at 02:56:13 AM
post Re: Exploding phones and electronics, a mini-series of 50kA discharges!
[Capacitor Banks]
Mads Barnkob
June 19, 2021, 05:30:28 PM
post Re: What is the guidence on SpaceX rockets based on ? PID's?
[General Chat]
Mads Barnkob
June 18, 2021, 07:48:01 PM
post Re: What is the guidence on SpaceX rockets based on ? PID's?
[General Chat]
Patrick
June 18, 2021, 02:48:57 AM
post Re: Syntherrupter - A Feature-rich, Polyphonic Interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Max
June 18, 2021, 01:22:10 AM
post Re: LCR meter recommendation
[Sell / Buy / Trade]
TMaxElectronics
June 18, 2021, 01:21:53 AM
post Exploding phones and electronics, a mini-series of 50kA discharges!
[Capacitor Banks]
Mads Barnkob
June 17, 2021, 08:27:10 PM
post Re: LCR meter recommendation
[Sell / Buy / Trade]
Mads Barnkob
June 17, 2021, 08:23:57 PM
post Re: LCR meter recommendation
[Sell / Buy / Trade]
Max
June 17, 2021, 02:51:45 PM
post Re: LCR meter recommendation
[Sell / Buy / Trade]
Da_Stier
June 17, 2021, 02:01:23 PM
post LCR meter recommendation
[Sell / Buy / Trade]
the_anomaly
June 17, 2021, 01:58:48 PM
post Re: The dramatic difference between wet and dry sphere splashes
[Science, Research and News In Other Fields Than Electronics]
Mads Barnkob
June 17, 2021, 12:42:03 PM
post Re: The dramatic difference between wet and dry sphere splashes
[Science, Research and News In Other Fields Than Electronics]
haversin
June 17, 2021, 02:49:00 AM
post Re: The dramatic difference between wet and dry sphere splashes
[Science, Research and News In Other Fields Than Electronics]
Mads Barnkob
June 16, 2021, 08:54:32 PM
post Re: The dramatic difference between wet and dry sphere splashes
[Science, Research and News In Other Fields Than Electronics]
davekni
June 16, 2021, 08:00:50 PM
post Re: The dramatic difference between wet and dry sphere splashes
[Science, Research and News In Other Fields Than Electronics]
haversin
June 16, 2021, 05:40:40 PM
post Demo Coil Protection
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
June 16, 2021, 05:39:14 PM
post Re: What is the guidence on SpaceX rockets based on ? PID's?
[General Chat]
Twospoons
June 16, 2021, 10:20:30 AM
post Re: What is the guidence on SpaceX rockets based on ? PID's?
[General Chat]
Patrick
June 16, 2021, 07:33:15 AM
post Re: Through-hole layout of UD2.7C universal driver
[Dual Resonant Solid State Tesla coils (DRSSTC)]
dbach
June 15, 2021, 01:21:38 PM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
June 15, 2021, 12:02:58 PM
post Re: Through-hole layout of UD2.7C universal driver
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
June 15, 2021, 06:52:56 AM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
thedoc298
June 15, 2021, 05:43:07 AM
post Re: Through-hole layout of UD2.7C universal driver
[Dual Resonant Solid State Tesla coils (DRSSTC)]
dbach
June 15, 2021, 05:26:34 AM
post The dramatic difference between wet and dry sphere splashes
[Science, Research and News In Other Fields Than Electronics]
haversin
June 15, 2021, 02:27:03 AM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
June 14, 2021, 01:06:02 AM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
June 14, 2021, 12:44:31 AM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
June 14, 2021, 12:41:33 AM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
June 14, 2021, 12:11:13 AM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
June 13, 2021, 11:52:11 PM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
June 13, 2021, 11:38:44 PM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
June 13, 2021, 10:26:51 PM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
June 13, 2021, 09:57:56 PM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
June 13, 2021, 09:29:08 PM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
June 13, 2021, 08:53:25 PM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
June 13, 2021, 07:22:05 PM
post Re: First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
June 13, 2021, 07:02:28 PM
post Re: HFSSTC with fixed crystal-controlled frequency
[Solid State Tesla Coils (SSTC)]
Steve Ward
June 13, 2021, 06:25:20 PM
post First middle sized DRSSTC - Phase lead tuning
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rapy2
June 13, 2021, 02:48:59 PM
post OpenTheremin v3 loosing calibration after minutes
[Electronic Circuits]
gianpaolo
June 13, 2021, 12:00:09 PM
post Re: What is the guidence on SpaceX rockets based on ? PID's?
[General Chat]
Mads Barnkob
June 12, 2021, 07:28:03 PM
post Re: Rocket engine questions
[General Chat]
klugesmith
June 12, 2021, 07:23:12 PM
post Re: Rocket engine questions
[General Chat]
rikkitikkitavi
June 12, 2021, 12:24:06 PM
post Re: Nice PC Board Tesla
[Solid State Tesla Coils (SSTC)]
Da_Stier
June 12, 2021, 10:06:18 AM
post Re: Rocket engine questions
[General Chat]
plasma
June 12, 2021, 10:01:29 AM
post Re: Nice PC Board Tesla
[Solid State Tesla Coils (SSTC)]
Twospoons
June 12, 2021, 08:47:08 AM
post Re: What is the guidence on SpaceX rockets based on ? PID's?
[General Chat]
Patrick
June 12, 2021, 07:03:10 AM
post Re: Complications in the design of the first DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
PEDRO HENRIQUE
June 12, 2021, 06:42:56 AM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 
SimplePortal 2.3.6 © 2008-2014, SimplePortal