[Milsurplus] Fuses to protect transformers

[B. Smith]

Well I guess we are gonna beat the fuse issue to death.   :-)

I've been fusing all my HV supplies for years installed at the diode 
stack output prior to the filter caps and have never had an arc over 
inside the fuses, when they blow they really go- but the fuses have 
saved the diode stack  several times. I used standard 250 volt fuses .  
I especially have used them on 400 to 800 volt portable field inverter  
supplies for tube type military equipment to help recover from those 
little screw ups in the field or at Gilbert etc.  Several Broadcast 
stations that I have serviced over the years utilized fuses in the same 
manner. Motorola used fuses in  their HV supplies for older tube type 
transmitters.
  The AN/URC-32 High Voltage supply PP-2153/U utilizes fuses at the 
output of its diode stacks. For instance on the 2000 volt 500 ma supply 
it uses a 1 amp fuse. Good enough for the USN, good enough for me.(I did 
spend a short tour with them on loan from the USAF)

You can download the PDF file for the NAVSHIPS manual 93285(B) Volt 
2(Look for the power supply schematic on page  5-126) at Nick's 
fantastic site:
http://www.virhistory.com/navy/xmtrs/urc32/index.htm
Look for the power supply schematic on page  5-126. And thank you Nick.

My latest power supply for the GO-9 uses a fuse in the diode stack 
output. My ART-13 and other transmitters that I have built supplies for 
have  fuses in the HV output prior to the filter and have been very 
helpful.
http://k4che.com/GO-9%20Transmitter/High_Voltage_Supply/High_Voltage_Supply.htm

73
k4che