25 April 2019
The tap changer is one of the most complex parts in a transformer. Out of all the elements of a transformer in operation, it has one of the highest rates of failure occurrence and severity. Careful and regular maintenance is a basic requirement to facilitate trouble-free operation of transformers. The separation of the tap changer from the main tank is one way of reducing any potential issues and can also bring additional advantages.
In the event of a failure, if the tap changer is in a separate tank the windings and leads in the main tank are protected. Furthermore, if there is a failure, being in a separate tank can enable a more effective diagnosis of issues through the analysis of dissolved gases. Installing a Weidmann Barrierboard as an interface between the two tanks makes it possible to achieve both a separate oil sampling in the tap changer tank, and maintenance on the tap changer without emptying the main tank or interfering with it in any other way. In addition, decomposition products which are generated by the switching operation of the tap changer will not contaminate the oil in the main tank.
Weidmann Barrierboard meets the requirements up to the highest voltages and currents. They are designed according to mutually defined dimensional, electrical and mechanical frame conditions. The finished product is supplied vacuum-dried and oil impregnated. Deflection of the board and oil leaking rate can be tested in hydraulic pressure tests in compliance with customer requests.
For convenient assembly, the customer can choose between standard bolted connection or a high-current plug-in contact.
For more information please contact us.