High Voltage Energy Absorbing Resistors: Specifications and Requirements

 


High voltage energy absorbing resistors are critical components in various electrical applications, particularly in high voltage systems where energy dissipation and stability are paramount. In this article, we will explore the specifications, technical parameters, and environmental requirements of high voltage energy absorbing resistors rated at 100 kV or higher.

Rated Voltage and Testing Conditions

The rated voltage for these resistors is set at ≥100 kV. To ensure their reliability and performance, acceptance testing is conducted at 1.2 times the rated voltage, which means that the acceptance voltage reaches 120 kV. Furthermore, these resistors must withstand standard lightning impulse voltages characterized by a waveform of 1.2/50 μs.

Testing conditions are crucial for validating the performance of high voltage energy absorbing resistors. These tests are carried out in a controlled environment filled with sulfur hexafluoride (SF6) gas, under an absolute pressure of 0.2 MPa. The resistors undergo 10 cycles of testing, with a 5-minute interval between each cycle. This rigorous testing ensures that the resistors can operate reliably under extreme conditions.

Resistance Value and Stability

The resistance value of these high voltage energy absorbing resistors is specified at 5 kΩ ±10%, measured at a temperature of 25°C ±2°C. This precise resistance value is essential for maintaining the desired energy absorption characteristics and ensuring the safety and efficiency of electrical systems.

Moreover, the resistors exhibit specific stability characteristics under varying electric fields and temperatures. The electric field stability should not exceed -5% per kV·cm^-1, while the temperature stability is limited to -0.3% per °C^-1. These specifications indicate that the resistors can maintain their performance even when subjected to significant changes in environmental conditions.

Thermal Cycling and Mechanical Strength

Thermal cycling tests are also vital for assessing the durability of high voltage energy absorbing resistors. These tests involve subjecting the resistors to temperature variations from -25°C to 50°C over five cycles, with a temperature change rate of at least 1°C/min. This process simulates the real-world conditions that these components may face, ensuring their reliability in practical applications.

In addition to thermal stability, mechanical strength is a crucial aspect of these resistors. The resistors must withstand axial tensile forces of at least 40 N when fixed at their metallic terminals. This requirement ensures that the resistors can endure mechanical stresses without compromising their structural integrity.

Storage and Environmental Conditions

Proper storage conditions are essential for maintaining the performance of high voltage energy absorbing resistors. They should be stored in an environment with temperatures ranging from -25°C to 50°C, within a sulfur hexafluoride atmosphere. The absolute pressure during storage should be maintained between 0.5 kPa and 200 kPa. These conditions help preserve the resistors’ performance characteristics and extend their operational lifespan.

Conclusion

High voltage energy absorbing resistors are indispensable in high voltage electrical systems, providing essential energy dissipation and stability. With a rated voltage of ≥100 kV, robust resistance values, and stringent testing requirements, these resistors are engineered to perform reliably under extreme conditions. Their ability to maintain stability in electric fields and temperatures, coupled with mechanical strength and proper storage conditions, makes them a vital component in ensuring the safety and efficiency of high voltage applications.

In conclusion, when selecting high voltage energy absorbing resistors, it is crucial to consider their specifications and performance characteristics. By adhering to the outlined technical parameters and environmental requirements, manufacturers and engineers can ensure that these resistors meet the demands of modern electrical systems, ultimately contributing to enhanced safety and efficiency in high voltage operations. www.eak.sg

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