Metering Flashcards
what kind of meter has the capability to have all load current for the service flowing through it at rated service voltage?
self contained
what are the four types of self contained meters?
polyphase demand
single phase solid state
single phase electromechanical
polyphase electromechanical
self contained meters are limited to _____ volts and ______ amps or less.
600/400
one current coil and one potential coil working together to turn one disk are parts to a _____________ meter?
electromechanical
what kind of meter has no moving parts?
solid state
the number of watt hours per one rotation of the disk is called the?
Kh constant
a disk on an electromechanical meter does not rotate once for every ___ _____ consumed?
watt hour
a number that represents the ratio between the register gear train and the value registered on the meter dial.
Kr constant
in the absence of a rotating disk, a solid state meter uses a ___ ______ to determine watt hours
pulse recorder
poly phase also means ?
three phase
the most common service in the united states is?
three wire- 120/240 V single phase
three wire- 120/240 V single phase service takes what kind of meter?
a three wire meter
testing should be done at the meter base to ensure there is no ?
short circuit
heavy load
back feed
when removing and installing meters, always follow?
your company’s procedures
never remove a meter with more than _______ Kw of instantaneous load.
10
how can you find the instantaneous load?
kw=3.6 x kh x revolutions or pulses/seconds
theft of power when a consumer manipulates or bypasses the meter installation
energy diversion
what is used when the voltage and or current are too high for self contained metering?
transformer rated metering
voltage transformers are also called?
potential transformers
pts and cts are also refered to as?
instrument transformers
how is a voltage transformer different from other transformers?
it does not need to carry any load
when there is current flowing through the current transformer while the meter is not installed, the secondary must be kept _____ _______.
short circuited
transformer rated meters typically utilize a ?
test switch
customers are billed for power consumed and the meter reads at a reduced reading. what is used to compensate for this reduction?
power multiplier
AMR (automated meter reading) allows utilities to to?
remotely collect data
allows for the removal and testing of the meter without opening the secondary circuit from the current transformer
test switch
one way communication tech that allows utilities to remotely collect data.
AMR (automated meter reading)
two way communication tech that allows utilities to remotely collect meter data and customers to review and manage usage in real time.
AMI (advanced metering infrastructure)
communication software that communicates with the meters to send or receive information.
head-end software
communication system that carries the data between the meter and the head-end software.
network
a network where data travels by radio frequency from one meter to another meter until the information reaches its destination.
radio frequency mesh
a network where data travels over existing power lines to send information to the head end software or the meter
power line carrier
a network similar to RF mesh because it uses a radio frequency, but the meters communicate directly to a collector instead of reading from meter to meter.
wide area network
hardware needed for the network to communicate to the head-end software and the meter
network infrastructure
devices installed at the customer’s location that are used to communicate information to the customer and the utility
end points
