The abb circuit breaker hd4-hxa/w is a medium voltage device designed to ensure the safe and efficient operation of electrical systems. Utilizing sulfur hexafluoride (SF6) gas for arc extinction and insulation, this circuit breaker offers reliable performance in various applications. Its design caters to the needs of modern electrical infrastructures, providing both fixed and withdrawable options to suit different installation requirements.
In today’s rapidly evolving electrical landscape, the importance of robust and reliable circuit breakers cannot be overstated. The ABB HD4-HXA/W stands out by offering a combination of advanced technology, safety features, and ease of maintenance, making it a preferred choice for engineers and technicians alike.
Technical Specifications
Understanding the technical specifications of the ABB HD4-HXA/W circuit breaker is crucial for its proper application and operation. Here are the key specifications:
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Rated Voltage: 12 to 36 kV
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Power Frequency Withstand Voltage: 28 to 70 kV
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Lightning Impulse Withstand Voltage: 75 to 170 kVp
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Rated Current: 630 to 3,600 A
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Breaking Capacity: 16 to 50 kA
These specifications highlight the circuit breaker’s capability to handle high voltage and current levels, ensuring the protection of electrical systems under various conditions.
Design and Construction
The ABB HD4-HXA/W circuit breaker boasts a compact and withdrawable design, facilitating easy installation and maintenance. Its construction incorporates SF6 gas as both the arc extinguishing and insulating medium. This choice of insulation ensures minimal arc chopping and prevents the generation of overvoltages, contributing to the longevity and reliability of the circuit breaker.
The poles of the circuit breaker are sealed for life, adhering to IEC 62271-100 standards, and require no maintenance. This design choice not only enhances safety but also reduces the operational costs associated with regular maintenance.
Operational Mechanism
At the heart of the ABB HD4-HXA/W circuit breaker lies the ESH type mechanical operating mechanism. This stored energy mechanism allows for rapid opening and closing operations, independent of the operator’s actions. The mechanism ensures that the circuit breaker can respond swiftly to fault conditions, minimizing potential damage to the electrical system.
Additionally, the circuit breaker employs an autopuffer breaking technique. This method utilizes the energy from the arc itself to generate the gas flow needed for arc extinction. The result is a highly efficient and reliable interruption of fault currents, even under challenging conditions.
Performance and Reliability
The performance of the ABB HD4-HXA/W circuit breaker is characterized by its ability to extinguish arcs without chopped current, thereby preventing restriking after breaking. This feature ensures a rapid recovery of the dielectric properties of the insulating medium, allowing the circuit breaker to be ready for subsequent operations almost immediately.
Moreover, the circuit breaker’s design ensures that it can withstand insulation voltage even at zero relative pressure. This capability is crucial for maintaining system integrity under varying environmental conditions. The maintenance-free nature of the sealed poles further enhances the reliability and reduces the total cost of ownership.
