**What Is Burden Of Ct**. The burden in a ct metering electrical network is largely resistive impedance presented to its secondary winding. It produces a current in its secondary which is proportional to the current in its primary.

The external load applied to the secondary of a current transformer is called the “burden”. It can be calculated as below: If this limit is exceeded, ct accuracy is not guaranteed.

### In Simple Words, It Is The Load Connected To Ct Secondary.

Common burden ratings of ct: The ct secondary current is equal to. Let us consider, i (p) = primary current in amps.

### Ct Burden = Secondary Va= (Secondary Voltage × Secondary Current).

Like all transformers, a current transformer can only transform a finite amount of energy. Ct burden means secondary volt ampere (va) i.e. Ct burden is the total resistance of the secondary load of a current transformer or, in other words, the maximum load that can be applied to a ct’s secondary.

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Typical burden ratings for iec cts are 1.5 va, 3 va, 5 va, 10 va, 15 va, 20 va, 30 va, 45 va & 60 va. Ct burden is commonly expressed in one of two ways: How is it specified (ii) calculate va output required from a ct of 5a rated secondary current when the burden consists of relay requiring 10 va at 5 a plus loop load resistance of 0.9 ohms.

### I (S) = Secondary Current In Amps.

The external load applied to the secondary of a current transformer is called the “burden”. Product of secondary voltage and secondary current. Increase in ammeter coil resistance) will cause increase in secondary burden.

### Since Any Ct Secondary Terminal Must Be Connected With The Burden Resistor At All Times Irrespective Of The Primary Current Flows.

N = turns ratio in numbers. It can be calculated as below: Here, the second figure shows the burden resistance.