Hydraulic Chuck is known that bushings are the highest failure components on large power transformers. Therefore, there are also bushing sensors available to ease bushing monitoring. They’re designed up to 800 kV and there are several mechanical interfaces available (North American and European). The bushing sensors provide both power frequency and partial discharge signal.

Their output voltage is limited to less than 20 volts. They are to be installed on bushings’ capacitor/potential taps and they monitor and detect problems with the bushing and winding insulation systems. The BAU-type bushing sensors are designed with the best protection known: open circuit protection, surge projection as well as fail safe circuitry if all the above protection fails.

These are just a few of the tools available for partial discharge and bushing monitoring. It is advisable that you log on a few specialized sites on the Internet before going out shopping. It might help you find better tools and even save some money. A place to start is elec-di.com. It’s a user-friendly site with a comprehensive database, where you can find detailed information about numerous tools and professional equipment that will ensure the safe and sound development of your installations.

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