Author Topic: Are bleeder resistors necessary if I can easily discharge my capacitor?  (Read 215 times)

Offline jpb133

  • High Voltage Enthusiast
  • *
  • Posts: 4
  • Karma: +0/-0
    • View Profile
I'm working on a mmc bank for my dual mot tesla coil, is it absolutely necessary to add bleeder resistors if I can easily discharge the capacitor? The terminals are close enough together that I can easily put a metal rod across them with the help of a well insulated pole. And wouldn't they discharge across the secondary coil of the transformer anyway? Can I simply short out the ends of the capacitor bank or must I discharge each capacitor individually? Thanks in advance for any information.

Offline profdc9

  • High Voltage Engineer
  • ****
  • Posts: 220
  • Karma: +10/-0
    • View Profile
I'm working on a mmc bank for my dual mot tesla coil, is it absolutely necessary to add bleeder resistors if I can easily discharge the capacitor? The terminals are close enough together that I can easily put a metal rod across them with the help of a well insulated pole. And wouldn't they discharge across the secondary coil of the transformer anyway? Can I simply short out the ends of the capacitor bank or must I discharge each capacitor individually? Thanks in advance for any information.

I made a dual mot tesla coil, and I discharged my capacitors with a rod across the safety spark gap.  However, if you forget to do this, and don't have bleeder resistors, the charge could easily kill someone.  Also, discharging the capacitors this way is hard on the capacitors, and occasionally even high quality Cornell-Dubilier capacitors have been known to explode if accidentally shorted.  I included twelve 33 megaohm resistors in series across each metal-oxide varistor as a bleeder.   I also had to include about 1000 pF of capacitance @ 20 kV for RF protection as well.

I have to say having built both a rotary spark gap MOT tesla coil and a DRSSTC, the DRSSTC is much more fun, and in some ways, easier to build.  Getting the rotary spark gap to work reliably was very hard.  The spark gap wheel is very hard to balance.  But I am happy to share details of how I put it together.  The schematic of my dual MOT tesla coil is attached.

Dan

Offline jpb133

  • High Voltage Enthusiast
  • *
  • Posts: 4
  • Karma: +0/-0
    • View Profile
Thanks for your help, it sounds like it would be worth it to add them in for safety and for the longevity of my capacitor bank. Can I use regular 10m ohm resistors either 1/2watt or 1 watt?

Offline MRMILSTAR

  • High Voltage Enthusiast
  • *
  • Posts: 19
  • Karma: +0/-0
  • Cedar Rapids, Iowa
    • View Profile
All energy discharge capacitors have a maximum current rating. As an example, I use a bank of 6 Maxwell 37667 capacitors in series-parallel for my spark gap coil. Each capacitor has a maximum current rating of 25,000 amps. This sounds like a lot but if you discharge directly across the terminals you can easily exceed this possibly resulting in damage. I found this out the hard way. My first capacitor bank had the bus bars too close together. During operation I would get an occasional very loud bang caused by flash-over between the bus bars. After about 5 of these flash-overs, the case of one of my capacitors cracked under the mechanical stress and it started leaking oil. I then re-designed the array to move the bus bars further apart. I also use a bleed resistor across each capacitor.

High Voltage Forum


 


* Recent Topics and Posts

post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
Bert911
July 19, 2019, 11:19:45 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
hightemp1
July 19, 2019, 03:36:44 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
DICKEYBIRD
July 19, 2019, 03:24:38 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
hightemp1
July 19, 2019, 02:23:29 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
DICKEYBIRD
July 19, 2019, 01:06:44 AM
post Re: Floppiclene! A Electronics Cleaning Relic of the Past.
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Justin
July 18, 2019, 10:29:32 PM
post Re: Floppiclene! A Electronics Cleaning Relic of the Past.
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Mads Barnkob
July 18, 2019, 08:52:35 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
hightemp1
July 18, 2019, 05:49:27 AM
post A new quick way to get into tune a DRSSTC
[Dual Resonant Solid State Tesla coils]
VNTC
July 18, 2019, 03:13:27 AM
post Re: Floppiclene! A Electronics Cleaning Relic of the Past.
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Twospoons
July 18, 2019, 12:06:53 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
hightemp1
July 17, 2019, 07:56:41 PM
post Floppiclene! A Electronics Cleaning Relic of the Past.
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Mads Barnkob
July 17, 2019, 11:25:22 AM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Netzpfuscher
July 16, 2019, 07:39:33 AM
post Re: What is the true in tuning guide?
[Dual Resonant Solid State Tesla coils]
VNTC
July 16, 2019, 05:11:21 AM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
profdc9
July 16, 2019, 04:05:07 AM
post Re: DRSSTC in brust mode
[Dual Resonant Solid State Tesla coils]
SAMGO
July 16, 2019, 02:25:27 AM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Hydron
July 16, 2019, 01:54:30 AM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
July 15, 2019, 02:51:26 PM
post Re: What is the true in tuning guide?
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
July 15, 2019, 02:48:02 PM
post Re: A problem solved with hand tools
[General chatting]
Mads Barnkob
July 15, 2019, 01:48:08 PM
post Re: Kaizer half bridge driver
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
July 15, 2019, 01:45:00 PM
post Re: A problem solved with hand tools
[General chatting]
Hydron
July 15, 2019, 11:21:29 AM
post What is the true in tuning guide?
[Dual Resonant Solid State Tesla coils]
VNTC
July 15, 2019, 10:01:21 AM
post A problem solved with hand tools
[General chatting]
klugesmith
July 15, 2019, 07:52:41 AM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General chatting]
klugesmith
July 15, 2019, 07:33:30 AM
post Re: tesla coil varnish is dumb
[Solid state Tesla coils]
Hydron
July 14, 2019, 10:49:03 PM
post Re: tesla coil varnish is dumb
[Solid state Tesla coils]
T3sl4co1l
July 14, 2019, 09:59:40 PM
post Re: tesla coil varnish is dumb
[Solid state Tesla coils]
Mads Barnkob
July 14, 2019, 08:20:52 PM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils]
Netzpfuscher
July 14, 2019, 06:06:30 PM
post tesla coil varnish is dumb
[Solid state Tesla coils]
Fumeaux
July 14, 2019, 05:29:10 PM
post Led Closeups with Mobile phone and lens .
[Smart phones]
DashApple
July 14, 2019, 03:00:09 PM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
July 14, 2019, 02:06:26 PM
post Re: DRSSTC in brust mode
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
July 14, 2019, 02:04:22 PM
post Re: Twin System Build
[Dual Resonant Solid State Tesla coils]
oneKone
July 14, 2019, 01:27:18 AM
post Re: DRSSTC in brust mode
[Dual Resonant Solid State Tesla coils]
johnf
July 14, 2019, 01:22:15 AM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
oneKone
July 13, 2019, 03:48:54 PM
post DRSSTC in brust mode
[Dual Resonant Solid State Tesla coils]
SAMGO
July 13, 2019, 04:17:55 AM
post Re: Kaizer half bridge driver
[Dual Resonant Solid State Tesla coils]
donnersm
July 12, 2019, 08:54:54 PM
post Re: Kaizer half bridge driver
[Dual Resonant Solid State Tesla coils]
profdc9
July 12, 2019, 07:16:40 PM
post Re: Kaizer half bridge driver
[Dual Resonant Solid State Tesla coils]
profdc9
July 12, 2019, 06:33:00 PM
post Smooth corona or heavy spark, RF wave radiation frequency of Tesla coil drops ve
[Dual Resonant Solid State Tesla coils]
VNTC
July 12, 2019, 11:09:28 AM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
July 12, 2019, 09:56:38 AM
post Re: Drsstc 3
[Dual Resonant Solid State Tesla coils]
oneKone
July 12, 2019, 01:23:58 AM
post Re: Completed my pulsed power generator
[Capacitor banks]
MRMILSTAR
July 11, 2019, 05:48:27 PM
post Re: Completed my pulsed power generator
[Capacitor banks]
Mads Barnkob
July 11, 2019, 02:58:13 PM
post Re: Kaizer half bridge driver
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
July 11, 2019, 02:45:24 PM
post Kaizer half bridge driver
[Dual Resonant Solid State Tesla coils]
donnersm
July 11, 2019, 06:59:01 AM
post Completed my pulsed power generator
[Capacitor banks]
MRMILSTAR
July 11, 2019, 05:43:31 AM
post Re: Twin System Build
[Dual Resonant Solid State Tesla coils]
fnordest
July 11, 2019, 01:05:42 AM
post Re: "LightningStorm" VTTC project
[Vacuum tube Tesla coils]
Avenger
July 09, 2019, 07:31:37 PM

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