Chint BH-0.66 series current transformers

Chint BH-0.66 series current transformers are high-precision measuring devices specially designed for indoor AC circuits. They are suitable for power systems with a rated voltage of 0.66kV and below and a frequency of 50Hz, and are mainly used in scenarios such as current monitoring, electric energy metering, and relay protection. The following is a summary of its core information:

 I. Technical Parameters and Performance Characteristics

1. **Electrical Specifications*The Role of Current Transformers*

   - **Rated Voltage**: 0.66kV (maximum voltage of the equipment is 0.72kV), in line with GB/T 20840.1/2 standards.

   - **Accuracy Class**: 0.2, 0.2S, 0.5, 0.5S, and 1 classes are available to meet different precision requirements (for example, class 0.2 is suitable for precision metering, and class 1 is suitable for general measurement).

   - **Rated Primary Current**: Covers 5-5000A, supports single busbar or cable through-core installation, and the window width ranges from 30mm to 200mm.

   - **Insulation Level**: Power frequency withstand voltage of 3kV, ensuring safe and reliable operation.

   - **Rated Load**: Depending on the model, the range is 2.5-30VA, which is compatible with various secondary equipment.

2. **Structural Design**

   - **Plastic Enclosure Closed Type**: Excellent protection performance, supports two installation methods: busbar fixing or base plate fixing, and can be installed horizontally or vertically.

   - **Through-Core Structure**: Installation can be done without disconnecting the circuit, supports multi-turn or single-turn threading, and flexibly adapts to different current scenarios.

   - **Independent Patent Terminal**: Firm wiring, strong anti-vibration ability, reducing the risk of poor contact.

3. **Environmental Adaptability**

   - Operating temperature: -5℃~40℃, humidity ≤90% (monthly average), altitude ≤1000 meters, suitable for most industrial environments.

   - Certified by CE, Russian PCT, etc., some models comply with IEC standards, which can meet the needs of the international market.

 II. Application Scenarios and Installation Guidelines

1. **Typical Applications**

   - **Power Systems**: Current measurement and electric energy metering in distribution cabinets and substations.

   - **Industrial Automation**: Real-time current monitoring of production line equipment, supporting PLC or DCS system access.

   - **New Energy Field**: Current data collection of photovoltaic inverters and energy storage systems.

2. **Installation Points**

   - **Wiring Specifications**: The secondary circuit must be reliably grounded to avoid high-voltage hazards caused by open circuits.

   - **Threading Requirements**: The wire must pass through the window centrally, and the number of turns must strictly match the rated current ratio when multi-turn threading is used.

   - **Environmental Conditions**: Avoid strong electromagnetic interference, and stay away from high-temperature, humid or corrosive environments.

 III. Purchase and Service Support

1. **Model Selection**

   - Select the corresponding model according to the current range, precision requirements and installation space. For example:

     - BH-0.66 30Ⅱ: 30mm window, suitable for small currents (such as 30/5A).

     - BH-0.66 80Ⅱ: 80mm window, suitable for large currents (such as 750/5A).

   - When placing an order, parameters such as current ratio, accuracy class, and window width must be specified. For example: BH(SDH)-0.66 40Ⅱ 200/5A 5VA class 0.5.

2. **Purchase Channels**

   - **International Market**: Purchase through Chint's global service providers via Whatsapp: 0086-13811255435.

   - **American Users**: Can contact via Whatsapp: 0086-13811255435 for customized needs.

3. **After-Sales Guarantee**

   - Provide technical support and product quality assurance, and on-site guidance can be arranged for engineering supporting projects.

   - Regular verification recommendation: According to the GB/T 20840 standard, it is recommended to conduct an error test every 2 years.

 IV. Precautions and Safety Tips

1. **Compliance Requirements**

   - The U.S. market needs to confirm compliance with UL or NEC standards (some models have passed UL certification, please consult the manufacturer for details).

   - The load of the secondary circuit must not exceed the rated value, otherwise the accuracy will be affected.

2. **Operation Taboos**

   - It is strictly forbidden to open the secondary side, otherwise high voltage may be generated, endangering equipment and personal safety.

   - When replacing the transformer, the primary circuit must be disconnected first to avoid live work.

3. **Selection Suggestions**

   - For metering purposes, 0.2S/0.5S classes are preferred, and for protection purposes, 5P class can be selected.

   - For large current scenarios, it is recommended to use multi-turn threading or split design to reduce costs.

V. User Feedback and Industry Evaluation

- **High Precision Performance**: The error of class 0.5 models is ≤0.5%, meeting the needs of most industrial scenarios.

- **Reliable Stability**: It can maintain stable performance in a wide temperature environment of -30℃~70℃.

- **Convenient Installation**: The plastic enclosure design and modular terminals have been well received by electricians, especially suitable for dense distribution cabinets.