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- From: wlsmith@valve.heart.rri.uwo.ca (Wayne Smith)
- Subject: Transient voltage supressors: Where and when to use them?
- Organization: (this space for rent)
- Date: Mon, 4 Jan 1993 17:59:15 GMT
- Message-ID: <1993Jan4.175915.362@julian.uwo.ca>
- Sender: news@julian.uwo.ca (USENET News System)
- Nntp-Posting-Host: valve.heart.rri.uwo.ca
- Lines: 34
-
- Where (in a circuit) and why would the following be used:
-
- 1) Transient Voltage Suppressors
- Glass passivated Die, 1 psec response time, uni and bi directional,
- 600 and 1500 watt peak pulse power dissipation,
- made by Diodes Incorporated
-
- 2) SIDACtor transient surge protector
- The SIDACTor is normally connected between the high side of the circuit
- to be protected and common. When the monitored voltage exceeds the
- breakover (clamping) voltage, the SIDACtor switches on through a negative
- resistance region to a low on state voltage in nano seconds. The SIDACtor
- is fastor than gas discharge, carbon arrestors and MOV's.
- Made by Teccor.
-
- 3) Interference Suppressor Capacitors
- Across the line, electromagnetic interference, isolation and line by-pass
- capacitors.
-
- 4) ZNR transient/surge absorbers (Panasonic)
- Zinc oxide non-linear resistors can be used in place of back to back
- zener diodes, protects against lightning, switching surges, noise spikes.
-
- 5) Other devices (surge supressors, etc) not listed here.
-
- Specifically, I'd like to get rid of a power-line spike (5-10 volts,
- 10-20 usec, on the neutral and hot, occurs about 45 degrees after peak and
- valley) and is caused by a nearby speed-controlled AC motor in a laminar
- flow fume hood. I'd like to put some kind of device right at the power
- receptical of this unit, but I'm not sure which one of the above devices
- would be best, or would even work. I'd like to eliminate this spike on the
- neutral line, because I believe this spike is radiating EMI in our lab.
-
- Any ideas?
-