KYZ pulse output help
KYZ pulse output help
(OP)
First of all, what exactly is a KYZ pulse output?
In my plant we have a "punch demand" meter that uses the KYZ from the utility meter to give an instantaneous load and also print it out on adding machine type paper.
I would like to replace this meter with something a little more modern, perhaps attach to the network. Is there a device that I can drop in to replace it?
We do have a power meter in parallel with the utility, I was also considering replacing it with a meter with trending capability.
Opinions?
In my plant we have a "punch demand" meter that uses the KYZ from the utility meter to give an instantaneous load and also print it out on adding machine type paper.
I would like to replace this meter with something a little more modern, perhaps attach to the network. Is there a device that I can drop in to replace it?
We do have a power meter in parallel with the utility, I was also considering replacing it with a meter with trending capability.
Opinions?






RE: KYZ pulse output help
The output used to be (and probably still is) a reed relay contact.
Any counting device that you can think of can be used to evaluate the KYZ pulse. Anything from a small PLC or micro to a PC or a dedicated data collector that can be bought from the meter producers.
Visit the Landis&Gyr or Enermet homepages for more information.
RE: KYZ pulse output help
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RE: KYZ pulse output help
RE: KYZ pulse output help
RE: KYZ pulse output help
The KYZ-pulse train has been around for many decades, and serves as a form of “parity check” in transferring watthour (or varhour, VA?hr, V²hr, A²hr, etc.) data. For KYZ applications, a degree of confidence is assured in that a KY-contact closure must be followed by a KY-contact opening, then KZ closure, KZ opening… If the equipment is so designed, it can be used for very high rates at very high {routinely million-dollar-a-month+ revenue} accuracy. Simple optocoupled form-A {MHz-scale} pulse trains are used in NIST-traceable energy standards by electric utilities in North America with 100-microwatthour/count rates having 600-volt, 150-ampere, 60-hertz inputs.
If you are using a KY- or KYZ-pulse train from the serving utility, they should be able to provide you with an exact Ke value in units of primary kilowatthours or megawatthours/count. Verify that the number you get is for the 2-wire or 3-wire form, or, as mentioned, your calculations will be off by a factor of two. The simplest of industrial timer/counter channels should work OK for your desired function.
If you install your own “revenue check” meter/transducer {and CTs+PTs} be extremely cautious in fingerpointing if readings don’t mesh.
RE: KYZ pulse output help