Kwh consumption using 2 CTs and 2 PTs

[dfopiso]

hello to all,

i would like to know the correct billing multiplier for the following:

our tenant has installed a GE V-63-A 480V check meter, with 2 CTs rated 350:5 and 2 PTs rated 240:480. our system is 240 volts line-to-line.

thanks in advance to your replies

dave.

 

[waross]

350/5=70
240/480=.5
7x.5=35
Your multiplier is 35

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[dfopiso]

thanks Bill
so the no. of CTs and PTs have no effect to the multiplier?
for 3 CTs and 3 PTs i assume the same procedure in getting the multiplier

dave.

 

[waross]

Actually you should consult a metering handbook. There is more than one way to connect revenue meters and the multiplier is not always straight forward.
I am assuming that your tenant is using a three wire delta system and a more common meter connection with one pass of the load cables through the CTs.
Some instances when the multiplier is not the product of the CTs and PTs:
For a check meter, they may be metering two phases and assuming a fairly balanced load. The multiplier would then be CT x PT x 3/2.
Some schemes pass the cables through the CTs more than once, or pass one cable through both CTs.
If your connection is not straight forward, you should consult a metering handbook.

Bill
--------------------
"Why not the best?"
Jimmy Carter