Name of the lesson
AC meters and AC Current Transformer Rings
Purpose of the lesson
During this lesson, you will learn how to choose the correct AC meter and current transformer ring for your site
Target Audience
Service providers, back-office, organization managers, technicians, etc.
What to expect at the end of the lesson
The user will acknowledge:
Which AC meters and Current Transformer Rings does Galooli provide
Which AC meters are suitable for which Current Transformer Rings
How to choose the perfect AC Meter and Current Transformer Ring for my site
How accurate are the AC Meter and the AC ring
How to install the AC meters and Current Transformer Rings on site
It is highly recommended to go through the contents in the order in which they appear
Which AC meters and Current Transformer Rings does Galooli provide?
Galooli supports a variety of AC meters and Current Transformer Rings according to the changing needs of the users, different currents, amount of phases, conversion ratio, and the diameter of the AC cables.
The meters can include an entry for the AC cable or meters that require the use of Current Transformer Rings.
Current Transformer Rings can be used with cables of varying diameters, some of which have an open and close mechanism.
Read more:
AC Meters:
CE Transducer CE42
CE Transducer CE42CT
Carlo Gavazzi EM210
AC Current Transformer Rings:
CE-CTH Split Core
Rogowski CT
Which AC meters are suitable for which Current Transformer Rings?
CE Transducer CE42 AC meter works without any Current Transformer Ring however, the cable entry can
be too narrow for some cable's diameter. CE Transducer CE42CT AC meter works best with the CE-CTH Split Core rings. Specifically with the rings
that has a conversion ratio of 1A Carlo Gavazzi EM210 AC meter works best with the Rogowski CT rings.
How to choose the accurate AC Meter and Current Transformer Ring for my site?
There are a couple of questions you should answer to choose the most suitable AC Meter and Current Transformer Ring:
What is the current that needs to be measured?
How many phases does the energy source have?
What is the conversion ratio?
What is the diameter of a cable that needs to be measured?
The following table allows you to easily choose the required products.
Catalog numbers are internal to Galooli.
Ring Diameter/Current | ≤ 30A | ≤ 50A | ≤ 150A | ≤ 200A | ≤ 4000A |
| CE42 400-ACMetAJ42B-502 No Current Transformer Ring needed |
| |||
| CE42CT | CE42CT | CE42CT |
|
|
| CE42CT | CE42CT | CE42CT |
|
|
| Carlo Gavazzi EM210 | ||||
| Carlo Gavazzi EM210 | ||||
| Carlo Gavazzi EM210 | ||||
How accurate are the AC Meter and the AC ring?
Item Codes/Data | Meter | Ring | Accuracy | |||
|---|---|---|---|---|---|---|
Galooli Item Code | Voltage reading | Current reading | CT | Overall voltage | *Overall current accuracy | *Overall kwh |
400-ACMetCE42CT-502 (Meter) | 0.50% | 0.50% | Not relevant | |||
400-AcRin24H30A1A-502 (Ring) | 0.50% | 0.50% | 0.50% | 0.50% | 1.00% | 1.50% |
400-AcRin24H50A1A-502 (Ring) | 0.50% | 0.50% | 0.50% | 0.50% | 1.00% | 1.50% |
400-AcRin24H150A1A-502 (Ring) | 0.50% | 0.50% | 1.00% | 0.50% | 1.50% | 2.00% |
400-AcRin36H30A1A-502 (Ring) | 0.50% | 0.50% | 0.50% | 0.50% | 1.00% | 1.50% |
400-AcRin36H50A1A-502 (Ring) | 0.50% | 0.50% | 0.50% | 0.50% | 1.00% | 1.50% |
400-AcRin36H150A1A-502 (Ring) | 0.50% | 0.50% | 1.00% | 0.50% | 1.50% | 2.00% |
**400-ACMetAJ42B-502 (Meter) | 0.50% | 0.50% | Not relevant | 1.00% | ||
***400-AcRin150A5A-502 (Ring) | 0.50% | 0.50% | 1.00% | 0.50% | 1.50% | 2.00% |
***400-AcRin50A5A-502 (Ring) | 0.50% | 0.50% | 3.00% | 0.50% | 3.50% | 4.00% |
*Overall current accuracy = Meter current reading accuracy + CT Accuracy
*Overall kwh accuracy = Overall voltage accuracy + Overall current accuracy
**The meter can measure current and voltage without a CT ring
***These rings are not available for sale
Calculation Examples
In order to see the calculation method and ensure that the data for the units are correct for you, please
refer to the attached Excel file. You should download the Excel file to your computer.
What is the best way to install the AC meters and Current Transformer Rings on site?
The installation process of the AC Meter and Current Transformer Ring needs to be accurate and in the right order for the current measurement will be correct.
You will find a lot of important information about the AC Meter and Current Transformer Ring installation process in the “Read more” section.