1. Product Overview
The Acrel AKH-0.66 30I series of low voltage current transformers are designed for accurate measurement of alternating current (AC) in various electrical applications. These transformers are suitable for installation on busbars or cables and are available in different primary current input ratings.
Key Features:
- Measurement: Alternating Current (AC)
- Accuracy: Class 0.2, Class 0.5, or Class 1.0
- Primary Current Input: 15A to 600A AC
- Application: Designed for use on busbars or cables
- Rated Voltage: 660V AC
- Rated Frequency: 50-60Hz
- Installation Options: Fixed by Sheet Metal, Fixed by Clutch Cover, or 35mm DIN Rail
- Loop Count of Cable: 1 to 5 loops
- Standards & Certificates: IEC/EN61869-1; IEC/EN61869-2; CE certified
Video: Overview of Acrel Current Transformer types, including measurement, protection, and residual current transformers.
2. Specifications
General Technical Specifications:
- Operating Temperature: -10℃ to +55℃
- Accuracy Class: 0.5
- Model Number: AKH-0.66 30I 200/5
- Max Operating Current: 150A & Above
- Rated Voltage: AC 660V
- Power Supply: AC
- DIY Supplies: Electrical
- Origin: Mainland China
- Certification: CE
- Rated Load: 2.5VA
- Related Current: 200A
Detailed Technical Parameters:
Image: Detailed Technical Parameters for AKH-0.66/I Series
Dimensions:
Image: Dimension Drawing of the Current Transformer
Image: Outline, Perforation, and Installation Sizes Table
3. Installation
The AKH-0.66 30I current transformer offers multiple installation methods to suit various application requirements. Always ensure power is disconnected before installation.
Installation Methods:
- Fixed by Clutch Cover (Curved Support Plate):
Image: Clutch Cover Installation (Curved Support Plate)
This method uses an M5 screw, a curved support plate, and a clutch cover to secure the transformer around a busbar. Ensure the busbar is properly seated within the transformer's aperture.
- Fixed by Clutch Cover (Straight Support Plate):
Image: Clutch Cover Installation (Straight Support Plate)
Similar to the curved plate method, this uses a straight support plate for busbars, providing a secure fit with the M5 screw and clutch cover.
- Fixed by Sheet Metal:
Image: Fixed by Sheet Metal Installation
This method involves securing the transformer to a flat surface using a bottom plate and screws. Ensure the mounting surface is stable and capable of supporting the transformer.
- 35mm DIN Rail Installation:
Image: 35mm DIN Rail Installation
For quick and easy mounting in control cabinets, the transformer can be clipped onto a standard 35mm DIN rail. Ensure it clicks securely into place.
4. Operation
Current transformers (CTs) are used to step down high currents to a measurable level for monitoring and protection. The primary winding is connected in series with the main circuit, and the secondary winding is connected to measuring instruments (e.g., ammeters, energy meters).
General Operating Principles:
- Ensure the primary circuit is carrying the current to be measured.
- Connect the secondary terminals (S1, S2) to the appropriate measuring device.
- Never operate a current transformer with its secondary circuit open while the primary circuit is energized. This can lead to dangerously high voltages across the secondary terminals and damage the CT.
- Observe polarity markings (P1, P2 for primary; S1, S2 for secondary) for correct measurement and protection applications.
5. Maintenance
Proper maintenance ensures the longevity and reliable operation of your current transformer.
- Regular Inspection: Periodically check the transformer for any signs of physical damage, discoloration, or loose connections.
- Cleaning: Keep the transformer clean and free from dust, dirt, and moisture. Use a dry, soft cloth for cleaning. Do not use abrasive cleaners or solvents.
- Connection Integrity: Ensure all primary and secondary connections are tight and secure. Loose connections can lead to overheating and inaccurate readings.
- Environmental Conditions: Operate the transformer within its specified operating temperature and humidity ranges to prevent premature failure.
6. Troubleshooting
Addressing common issues to ensure proper functionality of your current transformer.
Image: Common Problems and Precautions
Common Problems and Solutions:
- Open-type Current Transformer Connection: The open-type current transformer must always be connected to a meter or other measuring device. Ensure that the transformer's secondary circuit is never open-circuited while the primary circuit is energized. An open secondary can generate extremely high voltages, posing a safety hazard and damaging the CT.
- Secondary Line Placement: Place all open current transformers connected to the secondary line on site, waiting for installation. This prevents accidental open-circuit conditions.
- Live Installation Precautions: If the primary bus on site is a cable, live installation can be carried out with appropriate safety measures. If the busbar is a copper bar, live operation requires more proficiency from the operator, and strict insulation protection measures are required to prevent electrical shock.
- Transformer Installation Cleanliness: When installing the transformer, ensure there are no impurities, dust, etc., on the cut surface of the iron core. Such contaminants can affect the performance and accuracy of the transformer.
7. Warranty and Support
Acrel Co., Ltd. provides comprehensive after-sales service for its products.
Image: After Sales Service Overview
After-Sales Service Includes:
- Free Technical Selection: Consult customer service for assistance in choosing the most suitable product for your needs.
- Technical Guidance: Free technical support is provided to clients before and after purchasing the product.
- Free Repair and Replacement: Products can be repaired or replaced for free during the warranty period with normal use.
- Two-Year Quality Warranty: A two-year quality warranty is provided from the date of purchase. Contact customer service if any problems arise.
Factory Address: No. 5, Dongmeng Road, Nanzha Town, Jiangyin City, Jiangsu Province.
8. User Tips
Here are some general tips for optimal use and safety when working with current transformers:
- Safety First: Always ensure that the power supply to the primary circuit is completely disconnected and locked out before attempting any installation, wiring, or maintenance on the current transformer.
- Correct Sizing: Ensure the CT's primary current rating matches or exceeds the maximum expected current in your circuit to prevent saturation and inaccurate readings.
- Secondary Circuit Integrity: Always keep the secondary circuit of the CT short-circuited or connected to a low-impedance load (like a meter) when the primary circuit is energized. Never leave the secondary open-circuited.
- Polarity Check: Verify the polarity markings (P1, P2, S1, S2) are correctly observed during wiring to ensure accurate current direction sensing, especially in protection schemes.
- Environmental Considerations: Protect the CT from excessive moisture, dust, and extreme temperatures outside its specified operating range to maintain performance and lifespan.
