Webster-Wilkinson transformer bushings are used in transformers as a means of electrical / mechanical connection from the outside of the tank (cables or overhead lines) to the inside of the tank (transformer windings).
There are typically three types of major insulating material used in bushing manufacture.
Porcelain insulation is a proven technology providing a low cost, long life and maintenance-free solution. It is able to withstand all environmental conditions. Porcelain insulators are normally supplied with brown glaze but grey glaze can be provided if required. For a given operating voltage porcelain insulators can be provided with varying creepage distances depending on environmental conditions.
Cast resin insulation is typically used in bushings rated at 12kV and below. Resin provides advantages over porcelain, as complete bushings can be produced faster and meet more demanding dimensional tolerances.
Composite insulation is useful in applications of high vibration and possible urban vandalism due to its natural flexibility and ability to withstand impacts.
PB Weir has been a leading manufacturer of Buchholz transformer protection relays for over 70 years.
Most faults in oil filled transformers cause the generation of gas.
Through the use of a Buchholz relay, the formation of this gas can be used as a warning of a developing fault.
All products are designed, tested and manufactured to meet the detailed requirements of both local and international standards.
Complying with the requirements of IEC 60214-1, Webster-Wilkinson’s range of rotary off-circuit tap selectors has a successful track record of over 30 years, with many thousands currently in service throughout the world. The standard range includes two voltage ratings – 24kV and 44kV with options of 100A or 200A.