SPDT switching time for Sudden Pressure Relay
SPDT switching time for Sudden Pressure Relay
(OP)
Has anyone performed any testing on a Qualitrol 900 to determine the switching time for the Form-C? In other words, the time (ms) from breaking to making. Also, would this action be a function of the fault magnitude in terms of psi/sec? Not sure of the mechanics behind this contact actuating. I'm programming relay logic via 2 binary inputs to receive and process the trip and I need to set some timers to hold the rising edge and falling edge detectors that I want to use. I will contact Qualitrol but I wanted to get some feedback here first.
Thanks guys...
Thanks guys...






RE: SPDT switching time for Sudden Pressure Relay
David Castor
www.cvoes.com
RE: SPDT switching time for Sudden Pressure Relay
RE: SPDT switching time for Sudden Pressure Relay
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Two curves are provided, so I'm guessing one curve is for open and the other for close. Looks like it is pressure rise dependent with delta t going to infinity for slow pressure rise rates.
RE: SPDT switching time for Sudden Pressure Relay
I thought of the two graphs as the dispersion in relay actuation time.
RE: SPDT switching time for Sudden Pressure Relay
However, I contacted Qualitrol and they said the two curves actually represent an operating region rather than the make vs. break actuating time curves.
In the end...according to Qualitrol...2 cycles is the transfer time from break to make and it is not a function of psi/sec.
RE: SPDT switching time for Sudden Pressure Relay
Actuation time would be the time from initial pressure rise to the time the relay contacts do something. I'm a bit vague at the ending time, since I don't which set of contacts Qualitrol uses. But draw the region wide enough and it will cover both sets of contacts.
Transfer time is the time from the opening of the NC side of the switch to the closing of the NO side.
RE: SPDT switching time for Sudden Pressure Relay