0
PS is a special class of protection transformer used in differential protection schemes. The CT is specified by what is known as the knee point (that is the point at which the CT saturates).
Because they are specified using the knee point, two separate CTs will have the same characteristics. These matched CTs won't introduce measurement error during through faults on differential protection schemes.
Wiki User
∙ 10y ago
Wiki User
∙ 14y agoClass PS CTs are special CTs used mainly in
balanced protection systems (including
restricted earth fault) where the system is
sensitively dependent on CT accuracy. Further
to the general CT specifications, we now need
to know:
• Vkp- Voltage knee point
• Io - Maximum magnetizing current at
Vkp
• Rs - Maximum resistance of the
secondary winding.
Add your answer:
Earn +20 pts
What is accuracy class in current transformer?
don't worry
How do you determine vkp and rct for class x current transformer given example of 8005a 15va class x ct?
RCT is Secondary resistance of Current transformer it depends on Design.
What does CL of a current transformer signifies?
CL of a CT is its accuracy class.. it is an approximate measure of the CT's accuracy. e.g. The ratio (primary to secondary current) error of a Class 1 (CL:1.0) CT is 1% at rated current
How is current controlled in welding transformer?
in welding machine, the transformer used is basically a current transforrmer. so by changing the tap of secondary side of transformer, we can increase or decrease the current in the transformer.
What is principle of Current transformer?
why does have to short-circuit secondary wire of current transformer ?
What is cl PS current transformer?
CL of a CT is its accuracy class.. it is an approximate measure of the CT's accuracy. e.g. The ratio (primary to secondary current) error of a Class 1 (CL:1.0) CT is 1% at rated current
What is accuracy class in current transformer?
don't worry
How do you determine vkp and rct for class x current transformer given example of 8005a 15va class x ct?
RCT is Secondary resistance of Current transformer it depends on Design.
Why leakage reactance is kept small?
Leakage reactance is useful for limiting the short circuit current in transformer and generators. therefore normally the reactance of transformer varies for 4.5% for distribution transformer to 12.5% for 400KV class.
Why current transformer rated as 0.5 5p 10p 20p?
These are the Class codes for CTs used for protection purposes.
What does CL of a current transformer signifies?
CL of a CT is its accuracy class.. it is an approximate measure of the CT's accuracy. e.g. The ratio (primary to secondary current) error of a Class 1 (CL:1.0) CT is 1% at rated current
How is current controlled in welding transformer?
in welding machine, the transformer used is basically a current transforrmer. so by changing the tap of secondary side of transformer, we can increase or decrease the current in the transformer.
What is principle of Current transformer?
why does have to short-circuit secondary wire of current transformer ?
Difference between potential transformer and current trasnformer?
The difference between current transformer and potential transformer is that the secondary of a current transformer can not be open circuited while under service whereas that of the potential transformer an be open circuited without any damage to the transformer.
What is zero current transformer?
It is a transformer with No load attach to it.
What is the reason for using a neutral current transformer on a transformer?
A current transformer is primarily used at the neutral point of a transformer for earth fault protection. A neutral current transformer will measure any ground fault current which will essentially flow from the star point of the transformer. A fault-detection device other devices is connected to the current transformer and, if the fault current exceeds a certain trigger value, the fault-detection device will give a trip command to an earth-fault relay to disconnect the supply of electricity to the transformer.
A transformer can only the voltage of an alternating current?
A transformer can only increase or decrease the voltage of an alternating current, and it is called step-up transformer or step-down transformer accordingly.
