![]() The current flowing through the secondary CT is 1.5 amperes. CT Ratio CalculationĪ current transformer has a CT ratio of 600:5, if the primary current flowing through the CT is 200 amperes, what is the CT secondary current?Ī CT is connected to an ammeter. CT Ratio CalculatorĮnter Primary and secondary current and enter calculate button, it will show the CT ratio.įor clearing the value, press the reset button for clearing the value. CT ratio of 40: 1 means, that if CT’s primary current is 40 amperes, its secondary current is 1 ampere. ![]() If the voltage ratio is 1:40, then the CT ratio will be 40:1. The CT ratio is also inverse of turn ratio. Now, we can establish one more relation of CT ratio with the primary and secondary voltage.įrom the above, it is clear that the CT ratio is the inverse of the voltage ratio. How to Calculate CT ratio from Voltage Ratio? In other words, we can say the CT ratio of the secondary is also equal to the ratio of secondary turns to primary turns. If we talk in terms of the number of turns, the secondary and primary will have 300 turns and one turn respectively. Now if we take the example of CT that has CTR 300/5, the secondary current will be 5 amperes for a primary current of 300 amperes. The relationship between CTR and its primary turns(N P) and secondary turns(N s) is as follows. The CT ratio has a direct relationship with the number of turns of the primary and secondary winding. The lower secondary current CT-like -/1 secondary is suitable for switchyard applications. The selection of the secondary current of the CT depends on the applications. The CTs are available in -/5 and -/1 secondary current. However, we can consider the secondary current as per the CTR of the CT. This is because of the ratio error in the CT. Here, note that practically the CT does not output the secondary current in the same ratio as mentioned on the nameplate of the CT. What does it mean if the CTR(CT Ratio) of the CT is 1000/5? It means when the primary of the CT carries 1000 amperes current, then the secondary of the CT will carry 5 amperes. In the mathematical expression, we can write it as CT Ratio Formula We can define the CT ratio as the ratio of primary current to secondary current. The reason for use of a lower current for metering and protection is that the energy meters and the protection relays can not function at higher voltage and higher current. The lower current is required for energy metering and circuit protections. CT reduces the primary current in a certain proportion, and the secondary current is always less than the primary current. What is CT Ratio?Ī current transformer(CT) has primary and secondary winding. The CT ratio is very important as a design factor of CT for a particular application. In this article, we will discuss the CT ratio calculator and CT ratio calculation formula.
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