What is CT and PT working principle?
A CT lowers the current signals for measurement purposes, while a PT lowers high voltage values into lower ones. The transformers are designed to measure whether power systems are both accurate and safe. In addition, the CT and PT transformer reduces the current and voltage from high to low value.
What is current transformer with diagram?
Current Transformers (CTs) It is a type of current transducer that will give current in the secondary which is proportional in magnitude to the current flowing through the primary. These are used to convert the high currents from power circuit into a measurable current range of instruments and control devices.
How are current transformers constructed?
Wound Type Current Transformer The heavy primary winding is directly wound on the top of the secondary winding with suitable insulation in between the two. Otherwise, the primary is wound completely separately and then taped with suitable insulating material and assembled with the secondary on the core.
Why is CT used?
A Current Transformer (CT) is used to measure the current of another circuit. CTs are used worldwide to monitor high-voltage lines across national power grids. A CT is designed to produce an alternating current in its secondary winding that is proportional to the current that it is measuring in its primary.
What is K and L in current transformer?
Terminals S1/S2 (k/l) The connections of the primary winding are designated “K” and “L” or “P1” and “P2”, and the connections of the secondary winding are designated “k” and “l” or “S1” and “S2”. The polarity must be established such that the “flow direction of the energy” runs from K to L.
What does a CT measure?
CT scans can detect bone and joint problems, like complex bone fractures and tumors. If you have a condition like cancer, heart disease, emphysema, or liver masses, CT scans can spot it or help doctors see any changes. They show internal injuries and bleeding, such as those caused by a car accident.
What is CT contrast?
CT scans may be done with or without “contrast.” Contrast refers to a substance taken by mouth or injected into an intravenous (IV) line that causes the particular organ or tissue under study to be seen more clearly. Contrast examinations may require you to fast for a certain period of time before the procedure.
What is P1 & P2 in CT?
CTs are marked with P1 and P2 to indicate which way they should be fitted around the cable or buss-bar. The side marked P1 must point towards the generator, and P2 must point towards the load. If an arrow is printed on the CT it must point towards the load.
What is RCT in current transformer?
The RCT indoor current transformer is used for metering and relaying applications in medium voltage (5 – 15 kV) switchgear. The RCT indoor current transformer is used for relay- ing and metering applications in medium voltage (5 – 15 kV) switchgear. The RCT-5 is sized for 5 kV switchgear.
What are CT numbers?
Computed tomography (CT) number is a calculated value reflecting the X-ray attenuation coefficient in an image voxel, generally expressed in Hounsfield units (HU), where the CT number of water is 0 HU.
What is a CT triple phase?
The triple-phase liver CT protocol is a useful examination in the assessment of focal liver lesions, hypervascular liver metastases and endocrine tumors. It involves a dedicated late arterial phase, portal venous phase and delayed phase acquisition.
What does a current transformer do?
What are the types of current transformer?
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What is the definition of current transformer?
The Current Transformer ( C.T. ), is a type of “instrument transformer” that is designed to produce an alternating current in its secondary winding which is proportional to the current being measured in its primary.
What is the use of a current transformer?
– Very large currents can be measured through Instrument Transformer. – The readings do not depend upon resistance or inductance or capacitance of the transformer. – The ammeter is connected in the secondary winding. – Several measuring instruments can be operated from a single Current tran