1. Introduction
This user manual provides essential information for the safe and effective installation, operation, and maintenance of the ABB Type CLE Current Transformer, Model 7524A63G05. This device is designed for accurate current measurement in industrial electrical systems. Please read this manual thoroughly before attempting any procedures to ensure proper handling and to prevent potential hazards.
2. Product Overview
The ABB Type CLE Current Transformer (CT) is a critical component for monitoring and protecting electrical circuits. It safely steps down high primary currents to a measurable level for instruments, meters, and relays. The Model 7524A63G05 features a robust design suitable for demanding industrial environments.
Figure 2.1: An overall view of the ABB Type CLE Current Transformer. This image displays the robust, dark-colored casing and the transparent terminal cover on top, indicating the primary and secondary connections. The toroidal shape allows for easy integration around a primary conductor.
Figure 2.2: Another angled view of the ABB Type CLE Current Transformer, highlighting its compact design and the mounting points on the base. The nameplate is visible on the side, providing key operational specifications.
Figure 2.3: A detailed close-up of the terminal block and the product nameplate. The transparent cover protects the secondary terminals (X1, X2) and shows the connection points. The nameplate clearly displays the model number, current ratio, and other electrical specifications.
Figure 2.4: An extreme close-up of the ABB Type CLE Current Transformer's nameplate. This view allows for clear reading of critical data such as "TYPE CLE", "CURRENT TX.", "S# 7524A63G05", "RATIO 6000:5 AMPS", "60 HZ", "NSV 0.6 KV", "BIL 10 KV", and "ANSI ACC. CL. METERING 0.3 B0.1 THRU B1.8". It also indicates "Made in U.S.A." and the manufacturer "ABB Power T&D Company Inc."
3. Safety Information
WARNING: Electrical shock hazard. Installation and maintenance should only be performed by qualified personnel.
- Always de-energize the primary circuit before installing or servicing the current transformer.
- Never open the secondary circuit of an energized current transformer. This can lead to dangerously high voltages and potential injury or equipment damage.
- Ensure all connections are secure and properly insulated.
- Verify the correct polarity before connecting the CT to metering or protection devices.
- Wear appropriate personal protective equipment (PPE) when working with electrical systems.
4. Setup and Installation
Installation of the ABB Type CLE Current Transformer requires adherence to local electrical codes and safety standards. It is recommended that a certified electrician or qualified technician perform the installation.
- De-energize Circuit: Ensure the primary circuit where the CT will be installed is completely de-energized and locked out according to safety protocols.
- Mounting: Securely mount the CT using appropriate hardware. The CT is designed to encircle the primary conductor.
- Primary Conductor: Pass the primary conductor through the center opening of the current transformer.
- Secondary Connections: Connect the secondary terminals (X1 and X2) to the metering or protection device. Observe correct polarity as indicated on the nameplate (H1-H2 for primary, X1-X2 for secondary). X1 typically corresponds to H1, and X2 to H2.
- Grounding: Ensure the secondary circuit of the CT is properly grounded at one point, typically at the X2 terminal, to prevent high voltage buildup.
- Verify Connections: Double-check all wiring for correctness and tightness.
- Re-energize: Once installation is complete and verified, the primary circuit can be safely re-energized.
5. Operating Instructions
The ABB Type CLE Current Transformer operates passively by inducing a proportional current in its secondary winding based on the primary current flowing through its core. Once installed, it requires no active user intervention for its primary function.
- Monitoring: The output of the CT (typically 5 Amps at rated primary current) is fed into a connected meter, relay, or other monitoring device. Refer to the instruction manual of the connected device for its operation.
- Load (Burden): Ensure the connected load (burden) on the secondary circuit does not exceed the CT's rated burden (e.g., B0.1 through B1.8 as indicated on the nameplate). Exceeding the burden can lead to inaccurate readings and potential damage.
- Polarity: Correct polarity is crucial for accurate directional measurements and proper operation of protective relays.
6. Maintenance
The ABB Type CLE Current Transformer is designed for long-term, reliable operation with minimal maintenance. However, periodic inspections are recommended to ensure optimal performance and safety.
- Visual Inspection: Periodically inspect the CT for any signs of physical damage, discoloration, or loose connections.
- Cleaning: If necessary, gently clean the exterior of the CT with a dry, lint-free cloth. Do not use abrasive cleaners or solvents. Ensure the power is off before cleaning.
- Terminal Check: Verify that all secondary terminal connections remain tight and free from corrosion. This should only be done with the primary circuit de-energized and the secondary circuit shorted or connected to a safe load.
- Environmental Conditions: Ensure the operating environment remains within the specified temperature and humidity ranges to prevent premature degradation.
7. Troubleshooting
Most issues related to current transformers stem from improper installation or external circuit problems. Always prioritize safety when troubleshooting.
| Problem | Possible Cause | Solution |
|---|---|---|
| No output from CT / Incorrect readings |
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| Overheating of CT |
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If troubleshooting steps do not resolve the issue, contact ABB technical support or a qualified service professional.
8. Specifications
The following specifications apply to the ABB Type CLE Current Transformer, Model 7524A63G05:
- Model Number: 7524A63G05
- Brand: ABB (Asea Brown Boveri / ABB Power T&D Company Inc.)
- Type: CLE Current Transformer
- Current Ratio: 6000:5 Amps
- Frequency: 60 Hz
- Nominal System Voltage (NSV): 0.6 kV
- Basic Impulse Level (BIL): 10 kV
- ANSI Accuracy Class: Metering 0.3 B0.1 THRU B1.8
- Outside Dimensions: Approximately 12" x 13" x 3" (30.5 cm x 33 cm x 7.6 cm)
- Inside Dimensions (Window): Approximately 8" x 8" x 3" (20.3 cm x 20.3 cm x 7.6 cm)
- Manufacturer Part Number: 236P750H07
- UPC: 782451081325
9. Warranty and Support
For information regarding warranty coverage, technical support, or service for your ABB Type CLE Current Transformer, Model 7524A63G05, please contact ABB directly through their official website or customer service channels. Ensure you have your model number and any purchase details available when contacting support.
You can visit the official ABB website for more information: www.abb.com
