What is current transformer?

There are various types of transformer such as power transformer, distribution transformer, earthing transformer and current transformer. Among all, the current transformer is relatively small in size and yet widely used in electrical system.

What is current transformer?

A current transformer (CT) is a measurement device designed to provide a current in its secondary coil proportional to the current flowing in its primary.

The current transformer had been created due to difficulties in constructing an ammeter, current coil of wattmeter, energy meters and relays designed to carry the full magnitude of current of higher than 100A of ac current.

Since the accuracy of the output current is the main concerned, some factors like burden, rating factor, physical CT configuration etc are to be designed accordingly to improve the accuracy of current transformer. The co-ordination of these factors is essential for the proper functioning of current transformers.

What is the difference between RG59, RG6 and RG11 Coaxial Cables?

The ‘RG’ acronyms are referred to ‘Radio Grade’ coaxial cabling is the cables that are commonly used for video and satellites installations. There are many kinds of cables to suit different applications, among which are the RG59, RG6 and RG 11 and the below is the comparison amongst them.

RG 59	RG 6	RG 11
Characteristic impedance is 75 Ohm Frequency range shall be up to 2150MHz. Center diameter having smaller diameter than RG 6 Higher attenuation (signal loss) than RG 6 The capacitance of the cable or ability of the cable to hold an electrical charge is the higher. Due to the attenuation, it’s commonly used for short length. Less weight per meter run. Less costly	Characteristic impedance is 75 Ohm Frequency range shall be up to 2150MHz. Center diameter having bigger diameter than RG 59 Less attenuation than RG 59 The cable capacitance is lower than RG 59. Normally used for length up to 90m (295ft.). More weight per meter run than RG 59. More costly than RG 59.	Characteristic impedance is 75 Ohm Frequency range shall be up to 2150MHz. Center diameter is the biggest compared to the rest Less attenuation compared to the rest. The cable capacitance is the lowest than the rest. Normally used for length up to 112m (400ft.) The highest weight compared to the rest. The most costly compared to the rest.

What is the difference between MCCB Type B, C and D?

Below are the comparison between MCCB type B, C and D.

Type B	Type C	Type D
The magnetic operating limit ranging from 3 to 5 times of its rated current. Normally used for wiring protection in lighting, socket outlet and control circuit.	The magnetic operating limit ranging from 5 to 10 times of its rated current. Normally used for overload and short circuit protection to protect for equipment with high making current.	The magnetic operating limit ranging from 10 to 20 times of its rated current. Normally used to prevent undesired early trip for an electrical equipment with very high making current such as heavy motor, transformer, etc.