The GEC Measurements VAJX11BF5363DA is a high-speed, multi-contact tripping relay designed for critical protection schemes in electrical power systems, ensuring rapid and reliable operation of circuit breakers during fault conditions.
Product Parameters (Datasheet)
- Model Number: VAJX11BF5363DA
- Relay Type: VAJX (High Speed, Multi-Contact Tripping Relay)
- Configuration: Triple Pole (3-Pole)
- Auxiliary Voltage (Vx): Typically 110/125 V DC (Verify via rating plate)
- Contact Arrangement: 3 Normally Open (NO) / 3 Make contacts per pole (Common configuration for DA variant)
- Operating Speed: Less than 10ms at rated voltage
- Reset Type: Hand Reset (standard for VAJX11 series)
- Burden: Low burden to ensure compatibility with sensitive initiation circuits
- Mounting: Draw-out case (Size A1 or equivalent)
- Standard Compliance: IEC 60255 or equivalent BS standards
Country of Origin
This protective relay is a product of United Kingdom engineering, originally manufactured by GEC Measurements (later Alstom/AREVA/GE) at the Stafford works.
Application Fields
The VAJX11BF5363DA is utilized in high-voltage substations and industrial power plants for:
- Circuit Breaker Tripping: Acting as the primary interface between protection logic and breaker trip coils.
- Inadvertent Energization Protection: Providing high-speed isolation in generator circuits.
- Interposing Logic: Multiplying protection signals to initiate multiple actions (e.g., tripping, alarming, and event recording).
- Busbar Protection: Part of centralized schemes requiring extremely fast fault clearance.
Product Usage Instructions
- Inspection: Before installation, ensure the relay is free from transit damage and the internal shipping restraints (if any) are removed.
- Mounting: Secure the draw-out case into the panel. Ensure the chassis is properly earthed.
- Wiring: Connect the DC auxiliary supply and trip initiation wires according to the specific terminal diagram for the “DA” suffix.
- Testing: Perform a secondary injection test to verify the pick-up voltage and ensure the contacts transition within the specified 10ms limit.
- Resetting: Since this is a hand-reset model, after a trip occurs, the operator must manually depress the reset button on the relay face before the circuit can be re-energized.
Product Technical Description
Technically, the VAJX11 is an attracted armature relay. It is designed to overcome the inertia of multiple contact sets while maintaining “High Speed” performance. The “BF” and “DA” codes in the model number specify the internal coil rating, contact material, and specific contact stack configuration. This relay is engineered for stability, meaning it will not mal-operate due to vibration or high-level DC interference on the battery bus, a critical requirement for substation reliability.
Q&A (Common Questions)
Q: Can this relay be used on an AC supply? A: No, the VAJX series is specifically designed for DC auxiliary systems to ensure consistent speed and reliability during power system disturbances.
Q: What is the difference between Hand Reset and Self Reset? A: Hand Reset (VAJX11) requires manual intervention to clear the flag and reset contacts, ensuring the fault is acknowledged. Self Reset (VAJX13) returns to normal automatically once the input signal is removed.
Q: Are the contacts suitable for direct breaker coil switching? A: Yes, the contacts are designed with high making and carrying capacities specifically for the inductive loads of circuit breaker trip coils.
Q: Can this relay replace an older VAJX model with a different suffix? A: You must verify the terminal arrangement and voltage rating, as suffixes like “DA” define the specific internal logic and contact map.
Similar Model Recommendations
- GEC Measurements VAJX11BF5362DA (Alternative contact configuration)
- GEC Measurements VAJX13 (Self-resetting variant)
- Alstom MVAJ11 (Modern equivalent/successor model)
- GEC Measurements VAA11 (Single pole auxiliary relay)
- GEC Measurements VXC11 (Time-delayed tripping relay)
For technical support and availability of the GEC Measurements VAJX11BF5363DA and other protective relay modules, please visit our digital catalog.
