What is burden in a current and in a potential transformer?

Burden is nothing but an output apparent power of the instrument transformer. The burden of the transformer is normally denoted in VA. VA means Volt Amp.

What is the burden of a voltage transformer?

IEEE Std C57. 13 states the thermal burden rating of a voltage transformer is the maximum burden in volt-amperes that the transformer can carry at rated secondary voltage without exceeding the temperature rise limits.

What is meant by burden of VT?

The “burden” is the total external volt-ampere load on the secondary at rated secondary voltage. If a potential transformer has acceptable accuracy at its rated voltage, it is suitable over the range from zero to 110\% of rated less voltage.

What is meant by burden related with instrument transformer?

“Burden” is the equivalent impedance of the electrical protective and measuring devices connected to the transformer(s) secondary. The. connecting leads are also included. Device impedances are furnished by the device manufacturer.

What is burden in CT and PT?

The burden is the termination impedance of the measuring instrument. The measuring instrument can be an analog or digital energy meter, a data logger or a recorder. Technically, the total burden for a CT is the internal winding resistance, the connecting lead resistance and the measuring instrument input resistance.

How do you calculate CT burden?

Burden for Metering type CT = Total Burden of Meters (Digital/Analog Ammeter, Voltmeter, Power Meter, MFM, Transducer) which are in series with CT + The total VA of the Cables connecting CT and the Meters. Cable VA = (2L x R x I^2).

What is PT accuracy class?

The standard accuracy classes for measuring voltage transformers shall be 0.1, 0.2, 0.5, 1.0 and 3. Here 0.5 means ±0.5 percent voltage error and ±20” phase displacement. The standard accuracy classes for protective voltage transformers are “3P” and “6P”.