Introduction to Protection Transformers
Protection Current Transformers are designed to measure the actual currents in power systems and to produce proportional currents in their secondary windings which are isolated from the main power circuit. These replica currents are used as inputs to protective relays which will automatically isolate part of a power circuit In the event of an abnormal or fault condition therein, yet permit other parts of the plant to continue in operation.
Protection CTs from ITL
Our protection current transformers are available in 5P or 10P accuracy class for each transformer ratio. This makes them usable in a number of applications ranging from magnetic trips or thermal overloads to IDMT overcurrent or earth fault relays and differential protection. For specific applications we offer special 'Class PX' Current transformer protection class.
How to choose a protection current transformer?
It can be difficult to pick the right CT for your application (especially if you do not have technical background).
Here are some things we will need to know before we can provide a quotation for you:
- Accuracy Class
- Application - indoor/outdoor
- Limiting Dimensions - CT has to fit on a busbar or in switchgear