What are the key specifications of the TI-75 current transformer. How does it compare to other models in the TI series. What are the main applications and installation considerations for the TI-75.
TI-75 Current Transformer: Technical Specifications and Features
The TI-75 is a single-phase current transformer designed for precise current measurement in electrical systems. Let’s examine its key specifications:
- Type: Single-phase
- Construction: Close core
- Transformation ratio: 75/5 (primary to secondary current)
- Accuracy class: 1
- Rated power: 1.5 VA
- Frequency range: 50-60 Hz
- Maximum working voltage: 0.66 kV AC
- Nominal secondary current (Is): 5 A
- Isolation breakdown voltage: 3 kV for 1 minute
How does the TI-75 differ from standard current transformers? Its compact design and high accuracy make it suitable for a wide range of applications where space is limited but precision is crucial.
Physical Characteristics and Installation Considerations
Understanding the physical attributes of the TI-75 is essential for proper installation and integration into electrical systems:
- Opening dimensions (P1/P2): Ø22 mm
- Weight: 0.135 kg
- Dimensions (WxHxD): 44 mm × 67 mm × 30 mm
- Connection type (S1/S2): 4 mm² screw terminals
- Tightening torque: 0.5 Nm
- Operating temperature range: -5°C to 40°C
- Mounting position: Vertical or horizontal
- Assembly: Blackboard or busway
- Ingress Protection Marking: IP20
Can the TI-75 be installed in any orientation? Yes, its versatile design allows for both vertical and horizontal mounting, providing flexibility in various installation scenarios.
Comparative Analysis: TI-75 vs Other Models in the TI Series
To better understand the TI-75’s position within the TI series, let’s compare it to other models:
| Model | Ratio (Ip/Is) | Class | Power (VA) | Hole Dimensions | Weight (kg) |
|---|---|---|---|---|---|
| TI-30* | 30/5 | 0.5 | 1 | Ø22 mm | 0.135 |
| TI-75 | 75/5 | 0.5 | 2.5 | Ø22 mm | 0.135 |
| TI-200 | 200/5 | 0.5 | 5.0 | 30/25/20×10; Ø22 mm | 0.235 |
| TI-600 | 600/5 | 0.5 | 10 | 40/30/-×10; Ø30 mm | 0.305 |
How does the TI-75 compare to other models in terms of power rating? The TI-75 offers a balanced 2.5 VA power rating, positioning it between lower-capacity models like the TI-30 and higher-capacity options such as the TI-200 and TI-600.
Applications and Use Cases for the TI-75 Current Transformer
The TI-75 current transformer finds applications in various electrical systems and industries:
- Power distribution panels
- Switchgear and control systems
- Energy metering and sub-metering
- Industrial automation
- Building management systems
- Renewable energy installations
Why is the TI-75 particularly suitable for these applications? Its compact size, high accuracy, and versatile mounting options make it ideal for installations where space is limited but precise current measurement is critical.
Safety Features and Compliance Standards
Safety is paramount in electrical systems. The TI-75 incorporates several features to ensure safe operation:
- Isolation breakdown voltage of 3 kV for 1 minute
- IP20 ingress protection rating
- Compliance with IEC 60044-1 standard
- Security factor (FS) less than 5
How does the security factor contribute to safety? A low security factor (FS < 5) helps protect connected instruments from damage during overcurrent conditions by limiting the secondary current.
Installation and Wiring Guidelines for Optimal Performance
Proper installation is crucial for the accurate and safe operation of the TI-75 current transformer:
- Ensure the primary conductor passes through the center of the transformer’s opening
- Securely mount the transformer using appropriate fixtures
- Connect secondary terminals (S1/S2) to the measuring instrument using appropriately sized wires
- Tighten terminal connections to the specified 0.5 Nm torque
- Verify that the installation environment falls within the specified temperature range (-5°C to 40°C)
Is special consideration required for the TI-75’s wiring? While the TI-75 doesn’t require special wiring, it’s essential to use properly sized conductors and ensure secure connections to maintain measurement accuracy and safety.
Maintenance and Troubleshooting Tips for the TI-75
To ensure long-term reliability and accuracy of the TI-75 current transformer, consider the following maintenance and troubleshooting tips:
- Regularly inspect for physical damage or signs of overheating
- Check and retighten terminal connections periodically
- Keep the transformer clean and free from dust and debris
- Verify the accuracy periodically using calibrated test equipment
- If inconsistent readings occur, check for loose connections or interference from nearby magnetic fields
How often should maintenance be performed on the TI-75? While the TI-75 is generally low-maintenance, it’s advisable to conduct visual inspections and connection checks at least annually or more frequently in harsh environments.
Future Trends and Innovations in Current Transformer Technology
As the electrical industry evolves, current transformer technology is also advancing. Some emerging trends and innovations include:
- Integration of digital output capabilities for direct communication with smart meters and control systems
- Development of energy-harvesting current transformers that can power themselves and auxiliary devices
- Increased use of non-conventional materials to improve accuracy and reduce size
- Implementation of advanced shielding techniques to minimize interference in high-noise environments
- Incorporation of IoT capabilities for remote monitoring and diagnostics
How might these innovations impact future versions of the TI-75? While the current TI-75 model focuses on traditional analog output, future iterations may incorporate digital communication features or energy-harvesting capabilities to enhance its functionality in modern electrical systems.
In conclusion, the TI-75 current transformer offers a compact and accurate solution for current measurement in various electrical applications. Its balanced specifications, versatile mounting options, and compliance with safety standards make it a reliable choice for both industrial and commercial installations. As technology continues to advance, we can expect future models to incorporate additional features that further enhance their performance and integration capabilities in smart electrical systems.
Current transformer TI-75
| Type | single-phase |
| Building | with close core |
| Transmission lp / ls | 75/5 |
| Class | 1 |
| Power [VA] | 1,5 VA |
| Frequency | 50÷60 Hz |
| Maximum working voltage | 0,66 kV AC |
| Standard number | IEC 60044-1 |
| Nominal secondary current Is | 5 A |
| Isolation breakdown voltage | 3 kV/1 min. |
| Opening dimensions P1 / P2 | Ø22 mm |
| Weight | 0,135 kg |
| Security factor | FS ˂ 5 |
| Connection S1 / S2 | zaciski śrubowe 4 mm² |
| Dimensions WxHxD [mm] | 44 mm × 67 mm × 30 mm |
| Tightening torque | 0,5 Nm |
| Working temperature | -5÷40°C |
| Mounting position | vertical/horizontal |
| Assembly | blackboard / busway |
| Ingress Protection Marking | IP20 |
Connection diagram
| type | Ip/Is | class | power [VA] | hole dimensions P1/P2 A1/A2/A3×B; C [mm] | dimensions W×H [mm] | weight [kg] |
| TI-30* | 30/5 | 0,5 | 1 | Ø22 | 87,5×104 | 0,135 |
| TI-40 | 40/5 | 0,5 | 1 | Ø22 | 87,5×104 | 0,135 |
| TI-50 | 50/5 | 0,5 | 2,5 | Ø22 | 87,5×104 | 0,135 |
| TI-60 | 60/5 | 0,5 | 2,5 | Ø22 | 87,5×104 | 0,135 |
| TI-75 | 75/5 | 0,5 | 2,5 | Ø22 | 87,5×104 | 0,135 |
| TI-80 | 80/5 | 0,5 | 2,5 | Ø22 | 87,5×104 | 0,135 |
| TI-100 | 100/5 | 0,5 | 2,5 | 30/25/20×10; Ø22 | 61×81×34 | 0,235 |
| TI-150 | 150/5 | 0,5 | 2,5 | 30/25/20×10; Ø22 | 61×81×34 | 0,235 |
| TI-200 | 200/5 | 0,5 | 5,0 | 30/25/20×10; Ø22 | 61×81×34 | 0,235 |
| TI-250 | 250/5 | 0,5 | 5,0 | 30/25/20×10; Ø22 | 61×81×34 | 0,235 |
| TI-300 | 300/5 | 0,5 | 5,0 | 30/25/20×10; Ø22 | 61×81×34 | 0,235 |
| TI-400 | 400/5 | 0,5 | 10 | 40/30/ – ×10; Ø30 | 75×99×40 | 0,305 |
| TI-600 | 600/5 | 0,5 | 10 | 40/30/ – ×10; Ø30 | 75×99×40 | 0,305 |
Attention!
Applies only to TI-30
* For correct operation of the transformer, a 4-fold transmission of the current cable through the transformer’s opening is required.
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