SU788198A1 - Method of ageing vacuum variable capacitors - Google Patents

Description

(54) METHOD OF TRAINING VACUUM CAPACITORS OF VARIABLE CAPACITY

one

The invention relates to the production of vacuum devices and can be used in the manufacture of variable-capacity vacuum capacitors, as well as during the operation of variable-capacity vacuum capacitors to restore electrical strength, which has decreased, for example, during long-term storage of capacitors.

The known method of high-voltage training of vacuum capacitors, in which the capacitor is connected by leads to a high voltage source with an adjustable output voltage, and gradually increases the voltage on the capacitor to the magnitude at which spark breakdowns occur inside the capacitor shell between its plates 1.

When regular breakdowns occur between the capacitor plates, the voltage between the terminals of the capacitor stops increasing and the capacitor is left under this voltage for some time, i.e., the capacitor is kept under voltage. In the course of such an exposure under voltage, spark breakdowns between the plates occur less and less, and then cease. After the cessation of spark breakdowns on the capacitor, the voltage is again increased to a value at which regular spark breakdowns reappear between the plates. Then make an exposure again, until the breakdown ceases. Thus, in the course of the training, the voltage on the capacitor reaches a value at which the spark breakdowns that occur between the plates, despite the exposure, are of an ongoing nature. At 10 this workout finish.

The disadvantage of this method is that it does not provide the required electrical strength of the capacitors.

The purpose of the invention is to increase the electrical strength of vacuum capacitors of variable capacitance.

This goal is achieved by the fact that the training process is carried out with a discrete change in capacity from the minimum to the maximum maximum value.

Claims (1)

The process of training in this method begins with the fact that they install an incomplete capacitor capacitance, for example, a capacitance С I equal to 5-10% of the maximum capacitance of the capacitor. Then the first stage of the training is carried out, which is carried out up to the limiting voltage U :. After this, a new value of capacitance Cj C is established and the second stage of the exercise is conducted until the limiting voltage LJ2.U, for example, 9XJi. The next stage of the training is carried out before the limiting voltage, for example 1), 913 0.81, etc. The last training is carried out with the full capacity of the capacitor C, and the limiting value of the voltage U, which is achieved at the same time, is higher than the known way to workout. This increase in capacitor electrical strength becomes possible due to the fact that training with partial values of capacitor capacitances, preceding training with a full capacitor, sparks a portion of the surface of the capacitor plates and eliminates its effect on the training process with full capacitance. The training is subjected to a vacuum capacitor of the type KP1-17B, which has an actual range of capacitance from 8.5 to 1050 pF. At the first stage of training, a capacity Ci equal to 100-150 pF is established, at the second stage of training Cj. 350-400 pF, with the third 650 pF, with the fourth € 4,850-900 pF, with an increment of € 5,1050 pF. As a result of this exercise, the electrical strength of the capacitor is 5.6 kV amplitude value, while the same capacitor subjected to training in a known manner has an electrical strength of 4.5 kB amplitude value. The use of the proposed method of training vacuum capacitors of variable capacitance provides, in comparison with the existing method of training, an increase in electrical strength and, as a result, provides an increase in the reliability of capacitors during operation. Claims The method of training vacuum capacitors of variable capacitance, including the supply of voltage to the capacitor plates, providing the occurrence of a breakdown, characterized in that, in order to increase the electrical strength, the training is carried out at a discrete change in capacitance from minimum to maximum. Sources of information taken into account in the examination 1. Buts V. P. et al. High-voltage training of vacuum capacitors using a semiautomatic device. “Electronic equipment, ser. 9, “Radio components, vol. 5, 1969, p. 69-76.