Author Topic: Circuit Protection  (Read 171 times)

Offline abstruse1

  • High Voltage Enthusiast
  • *
  • Posts: 38
  • Karma: +0/-0
    • View Profile
Circuit Protection
« on: October 15, 2021, 10:49:10 PM »
Greetings.  I've been using varistors to protect power supplies from high voltage spikes.  As I understand it, these things go from very high resistance to very low resistance when their "varistor voltage" is reached, and they shunt the spike to ground.  i just blew one up (sounded like small firecracker) that was across the output of a 50 v. benchtop DC power supply set to 10 VDC.  Dunno what caused this.

Are there such devices that work the opposite, namely going from low resistance to high resisitance when a spike comes along?  Like a fuse.
Abstruse1
   Been working with electricity for 60 years and still getting a tingle!

Offline klugesmith

  • High Voltage Engineer
  • ****
  • Posts: 406
  • Karma: +13/-0
    • View Profile
Re: Circuit Protection
« Reply #1 on: October 17, 2021, 01:49:47 AM »
Quote from: abstruse1
...Are there such devices that work the opposite, namely going from low resistance to high resistance when a spike comes along?  Like a fuse.
What does an un-operated fuse, or any low resistance device in series with your power supply, know of voltage?

There are things that switch to high resistance upon overcurrent, analogous to those switching to low resistance upon overvoltage.    Over by what ratio, how rapidly does the stress rise, how fast must the device operate, etc.?

High Voltage Forum

Re: Circuit Protection
« Reply #1 on: October 17, 2021, 01:49:47 AM »

 


* Recent Topics and Posts

post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ItsChloeUwU
Today at 07:54:59 AM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Rafft
Today at 06:44:04 AM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
Today at 12:31:43 AM
post Re: MidiStick V2.0: Next gen tesla coil interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
dbach
December 06, 2021, 11:51:07 PM
post Re: profdc9 ud2.7c tht question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
December 06, 2021, 07:48:31 PM
post Re: MidiStick V2.0: Next gen tesla coil interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
TMaxElectronics
December 06, 2021, 03:32:15 PM
post profdc9 ud2.7c tht question
[Dual Resonant Solid State Tesla coils (DRSSTC)]
costas_p
December 06, 2021, 01:57:36 PM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ItsChloeUwU
December 06, 2021, 11:07:28 AM
post Re: What driver to use for first DRSSTC build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
thedoc298
December 06, 2021, 04:17:35 AM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Maju
December 05, 2021, 11:58:51 PM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ItsChloeUwU
December 05, 2021, 11:21:11 PM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Maju
December 05, 2021, 08:53:57 PM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
December 05, 2021, 08:27:13 PM
post Go Big or Go Home
[Static Electricity]
abstruse1
December 05, 2021, 06:06:28 PM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ItsChloeUwU
December 05, 2021, 12:35:17 PM
post Re: Nokia Siemens 3G Flexi 2100MHz 50W Amplifier Teardown
[Radio Frequency]
Mads Barnkob
December 05, 2021, 12:02:05 PM
post Re: MidiStick V2.0: Next gen tesla coil interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
dbach
December 05, 2021, 12:20:13 AM
post [Ebay find]: 6x Infineon Fast IGBT Modul FZ400R12KE4 1200V 400A Semitrans
[Sell / Buy / Trade]
Mads Barnkob
December 04, 2021, 11:35:01 PM
post Re: MidiStick V2.0: Next gen tesla coil interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
TMaxElectronics
December 04, 2021, 11:02:35 PM
post Re: Nokia Siemens 3G Flexi 2100MHz 50W Amplifier Teardown
[Radio Frequency]
Da_Stier
December 04, 2021, 01:16:47 PM
post Nokia Siemens 3G Flexi 2100MHz 50W Amplifier Teardown
[Radio Frequency]
Mads Barnkob
December 04, 2021, 09:03:55 AM
post Re: Dissimilar caps for Marx or CW?
[Voltage Multipliers]
Mads Barnkob
December 04, 2021, 08:42:26 AM
post Dissimilar caps for Marx or CW?
[Voltage Multipliers]
abstruse1
December 04, 2021, 05:39:32 AM
post Re: Looking to build by first DRSSTC as a high voltage beginner
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
December 03, 2021, 07:27:09 PM
post Re: help with finding resonant frequency
[Beginners]
HVuser
December 03, 2021, 04:43:39 AM
post Re: Looking to build by first DRSSTC as a high voltage beginner
[Dual Resonant Solid State Tesla coils (DRSSTC)]
futurist
December 03, 2021, 01:37:46 AM
post Re: Practical limitations in size for Marx or CW
[Voltage Multipliers]
abstruse1
December 02, 2021, 11:35:39 PM
post Re: Practical limitations in size for Marx or CW
[Voltage Multipliers]
MRMILSTAR
December 02, 2021, 09:53:13 PM
post Re: gate drive transformer method
[Dual Resonant Solid State Tesla coils (DRSSTC)]
thedoc298
December 02, 2021, 05:10:30 AM
post Re: gate drive transformer method
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
December 02, 2021, 04:58:53 AM
post Re: Syntherrupter - A Feature-rich, Polyphonic Interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Max
December 02, 2021, 12:47:10 AM
post Re: gate drive transformer method
[Dual Resonant Solid State Tesla coils (DRSSTC)]
thedoc298
December 01, 2021, 10:30:50 PM
post Re: gate drive transformer method
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
December 01, 2021, 09:10:11 PM
post Re: gate drive transformer method
[Dual Resonant Solid State Tesla coils (DRSSTC)]
thedoc298
December 01, 2021, 06:36:14 AM
post Re: DRSSTC build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
November 30, 2021, 08:10:17 PM
post DRSSTC build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
balazs
November 30, 2021, 06:55:58 PM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
November 30, 2021, 06:23:03 AM
post Re: Help on my "first" SSTC (LabCoatz SSTC 2.0)- Popping transistors
[Solid State Tesla Coils (SSTC)]
davekni
November 30, 2021, 05:58:42 AM
post Re: gate drive transformer method
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
November 30, 2021, 05:35:58 AM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ItsChloeUwU
November 30, 2021, 01:50:18 AM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
futurist
November 30, 2021, 01:19:18 AM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ItsChloeUwU
November 30, 2021, 12:07:59 AM
post gate drive transformer method
[Dual Resonant Solid State Tesla coils (DRSSTC)]
thedoc298
November 29, 2021, 11:45:44 PM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ItsChloeUwU
November 29, 2021, 10:52:43 PM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Intra
November 29, 2021, 03:15:23 PM
post Re: Help on my "first" SSTC (LabCoatz SSTC 2.0)- Popping transistors
[Solid State Tesla Coils (SSTC)]
TiagoBS
November 29, 2021, 03:08:58 PM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Netzpfuscher
November 29, 2021, 12:15:12 PM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
November 29, 2021, 12:26:28 AM
post Re: 60hz synchronous motor on 50hz?
[Spark Gap Tesla Coils (SGTC)]
davekni
November 29, 2021, 12:07:30 AM
post Re: SG3525 push pull snubber calculation
[Transformer (Ferrite Core)]
davekni
November 28, 2021, 11:58:24 PM
post GDT (Gate Drive Transformer) tutorial
[Beginners]
davekni
November 28, 2021, 11:40:56 PM
post Re: 60hz synchronous motor on 50hz?
[Spark Gap Tesla Coils (SGTC)]
MRMILSTAR
November 28, 2021, 10:21:11 PM
post Re: 60hz synchronous motor on 50hz?
[Spark Gap Tesla Coils (SGTC)]
johnnyzoo
November 28, 2021, 10:05:40 PM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
November 28, 2021, 08:13:08 PM
post Re: Infrastructure and Architecture
[General Chat]
futurist
November 28, 2021, 06:12:44 PM
post Re: 60hz synchronous motor on 50hz?
[Spark Gap Tesla Coils (SGTC)]
MRMILSTAR
November 28, 2021, 04:48:04 PM
post Re: SG3525 push pull snubber calculation
[Transformer (Ferrite Core)]
PowerTech
November 28, 2021, 03:16:11 PM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ItsChloeUwU
November 28, 2021, 09:36:10 AM
post Re: 60hz synchronous motor on 50hz?
[Spark Gap Tesla Coils (SGTC)]
plasma
November 28, 2021, 05:32:16 AM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
November 28, 2021, 04:28:33 AM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ItsChloeUwU
November 28, 2021, 02:19:00 AM
post Re: Where to buy DIY or home made capacitor book(s)?
[Capacitor Banks]
huntergroundmind
November 28, 2021, 01:58:12 AM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
November 28, 2021, 12:53:27 AM
post Re: Driverless SSTC
[Solid State Tesla Coils (SSTC)]
davekni
November 28, 2021, 12:32:09 AM
post Re: Help on my "first" SSTC (LabCoatz SSTC 2.0)- Popping transistors
[Solid State Tesla Coils (SSTC)]
davekni
November 28, 2021, 12:16:04 AM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ItsChloeUwU
November 27, 2021, 11:42:08 PM
post Re: Hi! 811 A tesa coil
[Vacuum Tube Tesla Coils (VTTC)]
304er
November 27, 2021, 11:32:12 PM
post Re: Hi! 811 A tesa coil
[Vacuum Tube Tesla Coils (VTTC)]
jpvvv123
November 27, 2021, 11:09:43 PM
post Re: 60hz synchronous motor on 50hz?
[Spark Gap Tesla Coils (SGTC)]
paulj
November 27, 2021, 10:06:41 PM
post Re: SG3525 push pull snubber calculation
[Transformer (Ferrite Core)]
PowerTech
November 27, 2021, 09:40:34 PM
post Re: SG3525 push pull snubber calculation
[Transformer (Ferrite Core)]
davekni
November 27, 2021, 08:51:05 PM
post Re: Infrastructure and Architecture
[General Chat]
Da_Stier
November 27, 2021, 08:09:50 PM
post Re: SG3525 push pull snubber calculation
[Transformer (Ferrite Core)]
PowerTech
November 27, 2021, 06:00:42 PM
post Re: Someone built Big TC
[Spark Gap Tesla Coils (SGTC)]
MRMILSTAR
November 27, 2021, 05:04:46 PM
post Re: Someone built Big TC
[Spark Gap Tesla Coils (SGTC)]
304er
November 27, 2021, 04:45:14 PM
post Re: Welcome new members, come say hello and tell a little about yourself :)
[General Chat]
Mads Barnkob
November 27, 2021, 07:59:37 AM
post Re: Contest of motor slowness, or lowness of voltage?
[Science, Research and News In Other Fields Than Electronics]
Mads Barnkob
November 27, 2021, 07:52:59 AM
post Re: FPS1000HD unboxing and first impression
[High Speed Filming]
Mads Barnkob
November 27, 2021, 07:51:01 AM
post Re: Help on my "first" SSTC (LabCoatz SSTC 2.0)- Popping transistors
[Solid State Tesla Coils (SSTC)]
Mads Barnkob
November 27, 2021, 07:47:23 AM
post Re: Infrastructure and Architecture
[General Chat]
Mads Barnkob
November 27, 2021, 07:37:57 AM
post Re: Someone built Big TC
[Spark Gap Tesla Coils (SGTC)]
Mads Barnkob
November 27, 2021, 07:21:43 AM
post Re: BrOdin coil - High power Big sparks!
[Dual Resonant Solid State Tesla coils (DRSSTC)]
patracy
November 27, 2021, 06:06:59 AM
post Re: Someone built Big TC
[Spark Gap Tesla Coils (SGTC)]
304er
November 27, 2021, 05:27:27 AM
post Re: Kind of old single piece of glass plate capacitor
[Spark Gap Tesla Coils (SGTC)]
304er
November 27, 2021, 03:19:55 AM
post Re: Kind of old single piece of glass plate capacitor
[Spark Gap Tesla Coils (SGTC)]
304er
November 27, 2021, 02:31:46 AM
post Re: Kind of old single piece of glass plate capacitor
[Spark Gap Tesla Coils (SGTC)]
304er
November 27, 2021, 02:22:20 AM
post Driverless SSTC
[Solid State Tesla Coils (SSTC)]
bismallah
November 26, 2021, 11:59:27 PM
post Infrastructure and Architecture
[General Chat]
Da_Stier
November 26, 2021, 11:27:47 PM
post Re: 60hz synchronous motor on 50hz?
[Spark Gap Tesla Coils (SGTC)]
klugesmith
November 26, 2021, 11:17:55 PM
post Re: 60hz synchronous motor on 50hz?
[Spark Gap Tesla Coils (SGTC)]
MRMILSTAR
November 26, 2021, 08:24:39 PM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
November 26, 2021, 07:48:07 PM
post Help on my "first" SSTC (LabCoatz SSTC 2.0)- Popping transistors
[Solid State Tesla Coils (SSTC)]
TiagoBS
November 26, 2021, 07:44:25 PM
post Re: 60hz synchronous motor on 50hz?
[Spark Gap Tesla Coils (SGTC)]
davekni
November 26, 2021, 06:58:16 PM
post Re: 60hz synchronous motor on 50hz?
[Spark Gap Tesla Coils (SGTC)]
plasma
November 26, 2021, 05:40:37 PM
post Re: "Exploding" water
[Capacitor Banks]
MRMILSTAR
November 26, 2021, 04:39:07 PM
post Re: Kind of old single piece of glass plate capacitor
[Spark Gap Tesla Coils (SGTC)]
MRMILSTAR
November 26, 2021, 04:31:20 PM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Intra
November 26, 2021, 03:52:08 PM
post Re: "Exploding" water
[Capacitor Banks]
johnf
November 26, 2021, 09:17:07 AM
post Re: Kind of old single piece of glass plate capacitor
[Spark Gap Tesla Coils (SGTC)]
paulj
November 26, 2021, 08:45:34 AM
post Re: Some Starting Questions About My New DRSSTC ???
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ItsChloeUwU
November 26, 2021, 06:31:56 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