Glossary - Allen-Bradley Powermonitor 3000 User Manual

Glossary

Glossary Term
ampere
A unit of electrical current or rate of flow of electrons. One volt across
'one ohm of resistance causes a current flow of one ampere. A flow of
one coulomb per second equals one amp.
apparent power
The product of voltage magnitude and current magnitude in a circuit.
Units are VA or some multiple thereof.
balanced load
An alternating, current power system consisting of more than two
current carrying conductors in which these current carrying
conductors all carry the same current.
billing demand
The demand level that a utility uses to calculate the demand charges
on the current month's bill. Various methods may be used to
determine the value, such as minimum demand, peak demand or a
ratchet clause. It can be based on Watt Demand, VA Demand, VAR
Demand or some combination of these. A rate at which a transmission
occurs, where one baud equals one bit per second.
broadcast
Broadcast address is a value used for performing commands on all
Modbus slaves that are connected on the network. Slave address 0 is
reserved for this value.
burden
The electrical load placed on source of VA or the load an instrument
or meter places on a current or potential transformer. All current and
potential transformers have a rated burden which should not be
exceeded or else transformer transformation accuracy deteriorates.
capacitor
A device consisting essentially of two conducting surfaces separated
by an insulating material or dielectric. A capacitor stores electrical
energy, blocks the flow of direct current, and permits the flow of
alternating current to a degree dependent upon the capacitance and
frequency. They may also be used to adjust the power factor in a
system.
Allen-Bradley HMIs
17 Publication 1404-UM001D-EN-E - October 2004