HPR Type protection current transformer
Application
- It is used to collect low voltage overload and short circuit signals,and is used with protection relays
- The primary measurement range is 100-8000A, and the secondary output is 5A,1A
- Collect low voltage overload and short circuit signals,which can be used in conjunction with the motor protection unit.
- Used in places where there is no direct rain or snow,no serious pollution and severe vibration
HPR Series low voltage protection current transformer mainly suitable
for relay protection circuits where multiple busbarspass through
This product is developed for the protection system to detect short
circuit faults,It has different accuracy levels and accuracy limit
coefficients,it can be expanded to different perforation sizes and is
widely used in low voltage power distribution protection systems.
Standard
IEC-61869-2,EN60044-1,VDE0414-44-1,GB1208-2006
Product features
Shell is make of flame-retardant,120 temperature resistant imported
polycarbonate
The core is wound from oriented cold rolled silicon steel strip
secondary conductor is high strength electromagnetic enameled wire
The product structure is novel,beautiful in appearance,easy to install,
High accuracy and large capacity
Application
It is used to collect low voltage overload and short circuit signals,and is used with protection relays
The primary measurement range is 100-8000A, and the secondary output is 5A,1A
Collect low voltage overload and short circuit signals,which can be used in conjunction with the motor protection unit.
Used in places where there is no direct rain or snow,no serious pollution and severe vibration
FAQ
1. What is the difference between an HPR protection current transformer and a metering CT?
The HPR protection current transformer supplies current signals to protection relays for overload and short-circuit detection. A metering CT focuses on measurement accuracy during normal operation, while a protection CT must meet specified accuracy requirements at fault currents. Select the CT according to its intended application and the required protection characteristics.
2. How do I select the current ratio, protection class and rated burden for an HPR CT?
Select the current ratio according to the circuit’s rated current and the protection relay requirements. The protection class and accuracy limit factor should match the protection design. The rated burden must accommodate the connected relay, secondary cables and connections. Provide these requirements so HEYI can check the appropriate HPR model.
3. Should I choose a 1A or 5A secondary output for my protection relay?
Choose the secondary output that matches your protection relay’s rated current input. HPR current transformers offer 1A and 5A secondary options. For the same cable resistance, a 1A secondary circuit produces lower cable burden than a 5A circuit, which can be useful for longer cable runs. Confirm the relay input and total secondary burden before ordering.
4. How can I confirm that an HPR current transformer fits my busbar arrangement?
Check the CT window dimensions, overall dimensions and mounting clearance against your busbar arrangement. Include the width, thickness, number and spacing of the busbars passing through the window. Send HEYI your installation drawing to confirm a suitable HPR model before purchase.
5. What information should I provide when requesting an HPR protection CT quotation?
Please provide the current ratio, 1A or 5A secondary output, protection class, accuracy limit factor, rated burden and operating frequency. Also include the required window dimensions, installation conditions, quantity and any testing or documentation requirements. A project specification or relay datasheet helps us review your requirements and prepare an accurate quotation.
