What are current transformer used for?
Current transformers are used to step down the current in the secondary circuit for metering and protection purposes. They are used at generating stations, electrical substations, and in industrial and commercial electric power distribution
Can current transformers be connected in series?
In the current transformer, the primary winding is connected in series to the transmission line whose current is to be measured, and full line current flows via the winding.
How current transformer is used for protection?
These are used for giving input to the relays like Overcurrent and Earth fault to provide protection for feeders and motors etc in order to protect the circuit under consideration.
What is current transformer burden?
CT burden is the total resistance of the secondary load of a current transformer – the maximum load that can be applied to a CT’s secondary.
What are the different types of Current Transformer?
Live Tank CT
In live tank CT, the core with the secondary winding is housed in the top tank which is live.(AT HIGH VOLTAGE)
Dead Tank CT
In dead tank CT, the core and secondary winding is housed in the bottom tank which is earthed or DEAD.
Why current transformer secondary should not be open?
The secondary side of the current transformer is always kept short-circuited in order to avoid core saturation and high voltage induction so that the current transformer can be used to measure high values of currents
why current transformer blast?
As CT is oil filled, because of overheating, the oil of CT will get boil and start to vaporize. Because of the vaporization of CT oil, the CT housing will get pressurized and blast
What are the testing methods for current transformer?
- Insulation Resistance test.
- CT Resistance
- Ratio & Polarity test.
- Current Transformer Loop test.
- Primary Injection Test.
