The ceramic resistor is sintered by using a variety of metal oxide materials. The resistivity of the ceramic resistor is (1.87 ~ 3.0) × 106μΩ m, far greater than the resistivity (usually 1.0 ~ 2.0μΩ m) of any metal material. The resistor is compact in structure, non-inductive, small in size, fully sealed, and maintenance-free.
The ceramic resistor presents a negative temperature coefficient (-0.045%/℃) which is which is better than the temperature coefficient of the metal resistor, so that the resistance of the ceramic resistor is far more stable than the metal resistor in operation.
The melting point of ceramic resistor is greater than 3,000℃, and the maximum heat capacity is up to 600J/cm3. The resistor is in sheet or ring structure, and connected in series to meet the requirements of different resistances of the product. Due to the high heat capacity, the working temperature rise is lower than 70℃, so it is unnecessary to take mandatory cooling measures. It is fully sealed and maintenance-free.
The housing of ceramic grounding resistor is made of high-quality seamless steel pipe or steel plate. The surface is specially treated against corrosion. After assembled, the housing is tested in a vacuum state for its sealing performance, and is especially suitable for use in coastal wet areas. It is directly grounded, protected against electric shock, safe and reliable in operation, and easy to install. The product can be operated in parallel to facilitate the capacity extension and the continuous expansion of power grid.