The meter would be purchased with 3 x Current Transformers of the Amperage you need. ... This is a basic 3 phase meter which gives you a reading for the total usage of all three phases combined.
How does a CT meter work?
CT (Current Transformer) Meters are installed on any connections with a load greater than 100 Amps. ... A CT meter only measures a fraction of the current passing through the connection and a multiplier is applied to this reading to reflect the actual current.
How does a CT work electrical?
A current transformer is a device used to produce an alternating current in its secondary, which is proportional to the AC current in its primary. ... An electrical CT differs from a voltage or power transformer because it consists of only one or very few turns as its primary winding.1 may 2017
What is a CT ratio?
Ratio. The CT ratio is the ratio of primary current input to secondary current output at full load. For example, a CT with a ratio of 300:5 is rated for 300 primary amps at full load and will produce 5 amps of secondary current when 300 amps flow through the primary.
How do you determine the CT ratio for an energy meter?
When analog ammeters are installed, we can easily determine the CT ratio by observing the meter full scale value and then divide that value by 5.
What is the difference between whole current meter and CT meter?
A whole current meter is where the electricity supply passes through the meter itself, while a current transformer (in simple terms an electro-magnetic ring around the wire) or CT meter is where current transformers are used.19 sept 2011