Early capacitive voltage divider component connection structure

Author： GOZ Electric Time：2014-04-26 10:42:50 Read：14

    Capacitive voltage dividers in CVT, coupling capacitors, capacitive voltage dividers for high-voltage measurement, resonant capacitors in high-voltage series resonance test equipment, circuit breaker voltage equalizing capacitors, etc., all have a common feature in structure, that is, their capacitors The core is composed of dozens to hundreds of capacitive elements connected in series. The series connection method and winding structure of the capacitor core components are related to the electrical performance of the product, so it is particularly important to choose a good component electrical connection structure. For the sake of discussion. These types of capacitors are collectively called capacitive voltage dividers. Over the years, with the development of capacitive voltage divider product technology, the electrical connection structure of its components has also continued to change. Capacitor manufacturers will also choose different structural forms according to their different process conditions.

    This article introduces different types of component connection structures used in different periods, and analyzes the advantages and disadvantages of various connection structures.

     Capacitor internal series connection method:

     The early capacitive voltage divider was composed of multiple capacitor units connected in series and divided into two parts: a high-voltage arm and a low-voltage arm. The high-voltage arm was composed of multiple capacitors connected in series. These capacitors have independent shells and terminals. They are connected in series and packaged in an insulating shell of a voltage divider. One end is connected to the high-voltage lead, and the other end is connected to the low-voltage arm: the low-voltage arm is usually composed of a capacitor, one end is connected to the lower end of the high-voltage arm, and the other end is grounded; both ends of the low-voltage arm The terminal leads are connected to the low voltage measuring device.

     With the development of power capacitor manufacturing technology. The method of connecting multiple capacitors in series is rarely used anymore. In most cases, the capacitor elements are directly stacked and connected in series, packaged in the same housing, and high-voltage terminals, medium-voltage terminals and ground terminals are drawn out at appropriate series nodes. The plates of this structure have high utilization rate and simple processing, and have been widely used for a long time. However, since voltage dividing capacitors usually have a large number of components, the core welding workload is large and the production efficiency is low. Burrs on the edge of the lead sheet may also cause damage to the insulating medium, thus giving rise to a series of new component connection structures.