How do you calculate burden value?
Burden of CT can be specified as Volt-Ampere absorbed at certain Power Factor i.e the VA that can be consumed by the load. The burden can also be expressed as total Impedance in terms of ohms connected on secondary of CT i.e. pilot conductor and instrument burden (I2 x R=VA).
How do you calculate relay burden?
The formula for relay burden (Zr) = VA/(I square) ohms for CT or = (V square/VA ohms for VTs. While wire and CT, burden Zw = equal to r + jx for wire, Zct = r + jx for CT.
What is burden in transformer?
Burden. The secondary load of a current transformer is termed the “burden” to distinguish it from the primary load. The burden in a CT metering electrical network is largely resistive impedance presented to its secondary winding.
What is class P CT?
PS Class CT is also known as PX Class or simply Class X Current Transformer. It is special type of current transformer meant for protection purpose. Various protection class CTs as described in IS 2705 part-3 is only useful for overcurrent protection. You may refer Accuracy Class of CT for detail.
What is current burden?
Burden in of a current transformer: The burden can be expressed as the total impedance in ohms of the circuit or the total volt-amperes (VA) and power factor at a specified value of current or voltage and frequency.
What is burden of a CT?
The burden of the CT is the resistive load used to create the voltage on the output. It varies with turns ratio, desired output and current rating of the primary.
What is Burden relay?
Explanation: Since burden is resistive element so it will always absorb power. This power is absorbed by relay circuit and is used to trip the circuit breaker. It is measured in V A (Volt – Ampere).
What is the rated burden in current transformer?
The ratio of rated short time current to rated primary current. A specification by the manufacturer at which CT performs with the specified accuracy.
What is a burden resistor in current transformers?
CT burden resistor is the resistor which will be connected across the current transformer terminal S1 and S2. The main purpose of the burden resistor is to protect the current transformer under open conditions.
What is the difference between PS class and 5P20 CT?
The PS class CT is used for unit protection purposes such as Alternator, Transformer etc.. The 5P10/ 5P20 class CT are used for protections such as standby earth fault ,Earth fault, feeder protection etc..
What is burden resistance?
What is Burden resistor: CT burden resistor is the resistor which will be connected across the current transformer terminal S1 and S2. The main purpose of the burden resistor is to protect the current transformer under open conditions.
What is the difference between the ‘P’class CT and the “PS”class CT?
The special protection class CTs are used for differential protection. What is the difference between the ‘P’ class and the ‘PS”class CT? The PS class CTs used for differential protection have identical knee point voltage. Under through fault condition, both the CT operates, and thus the differential relay remains inoperative.
What is PS class CT in power supply?
What is PS Class CT? PS Class CT is also known as PX Class or simply Class X Current Transformer. It is special type of current transformer meant for protection purpose. Various protection class CTs as described in IS 2705 part-3 is only useful for overcurrent protection. You may refer Accuracy Class of CT for detail.
What is PSX class CT?
PS Class CT is also known as PX Class or simply Class X Current Transformer. It is special type of current transformer meant for protection purpose. Various protection class CTs as described in IS 2705 part-3 is only useful for overcurrent protection. You may refer Accuracy Class of CT for detail.
What is the use of protection class CTS?
The protection class CTs like 5P10, 5P20, and 10P10, 10P20 are used for sensing the overcurrent and earth fault current at the time of the fault. If we use protection class CTs for differential protection scheme, What will happen? Do protection class CTs provide protection under unit faulty conditions?