EA008525B1 - Condensing device with a current-limiting function - Google Patents

Abstract

The invention relates to electrical engineering, more definite to a condenser device with a property of limiting maximum charging current, for which it comprises at least two connected in parallel RLC circuits consisting of connected in series elements of reactance, active and inductive resistances, the parameters of said RLC cirduits are different and such that times of reaching maximum charging and correspondingly discharging currents in elements of capacitance of the different RLC circuits have different values which leads to strengthening the limit rate of the maximum charging currents compared to the analogues, parameters of RLC circuits of which are similar.

Description

The invention relates to the field of electrical engineering, and more specifically, to the design of a capacitor device, which has the property of limiting the maximum charging current with a predominantly pulsed charging voltage and during discharging.

The need to limit the maximum charging current of capacitors is due to the presence of a peak current pulse at the initial moment of charging, which has a destructive effect on the capacitor plates (Rennes VT. Electric capacitors. L., 1969, p. 36, fig. 10).

The closest analogue of the capacitor device is a capacitor device with a current-limiting function, containing such electrical elements as capacitive (C), inductive (b) and active (I) resistances connected in series in CES-circuit (Japanese Patent No. 3436040, IPC ⁷ H0U 4/40, published 11.08.2003, ISM 2004, issue 101, No. 8, p. 33, abstract No. 118).

The disadvantage of the known capacitor device is that such a design does not exhaust the technical possibilities of limiting the maximum charging and discharge currents, which is caused by the one-time achievement of the maximum charging and discharge currents in its CES circuit. In addition, known designs are characterized by increased electrical energy loss and a negative impact on the quality of electrical energy in the supply network.

The objective of the present invention is to propose the design of a capacitor device having (at a certain predetermined capacity) extended limits for limiting the maximum currents during its charging and discharging using electric means used in the prototype construction.

Another task is to reduce electricity losses and reduce the negative impact on its quality in the electrical network.

The tasks are solved due to the fact that in a capacitor device with a current-limiting function containing at least two parallel-connected CES circuits consisting of capacitive, active and inductive resistance elements connected in series, the parameters of each CES circuit are different and such that Achievements of maximum charging and, accordingly, discharge currents in the capacitance elements of various CES circuits have different values.

In the proposed technical solution, current-limiting elements, for example, inductive resistances, in KFC-circuits perform not only the direct current limiting function, but ensure the implementation of this function for a longer time, thus implementing a comprehensive current limiting, reducing the negative impact on the quality of electricity in the supply network and reducing energy consumption in inductive and active resistances due to parallel connection of CES-circuits.

The electrical connection scheme of the proposed capacitor device is extremely simple and clear from the description - these are at least two parallel CES circuits with different parameters and providing the specified capacitance.

To display the advantages of the proposed capacitor device in comparison with the analog capacitor device in FIG. 1 shows a graph of the charging current of the analog device; in fig. 2 - the same for the proposed capacitor device (the graph is given as a special case of two CES circuits).

The plots of FIG. 1 and 2 are made on the same scale.

On the abscissa axis of both graphs, the time of 1 charging of the compared capacitor devices of a given (identical) capacitance is postponed; on the ordinate axis - the magnitude of the charging current ί. In the analog condenser device (Fig. 1), the maximum charging current 1 _max 1 is reached by the current ΐ ₁ once and relatively quickly in time 1 ₁ ; _{Because of} this speed, the power of the charging pulse is poured into a relatively large amount of current 1 _taX (Fig. 1). FIG. 2, the charging time of a capacitor device of the same (specified) capacity is increased due to the presence in its design of several (specifically two) parallel CES circuits with different parameters. One CES circuit of the proposed capacitor device of a given capacity reached a current ί _{2 with a} maximum charging current of 1 _takh2 , ₃ during 1 ₂ , and the other CES circuit of this capacitor device with a current of ί ₃ reached a maximum charging current of 1 _{takh 2} , ₃ during 1 ₃ . Thus, the power of the charging pulse for a capacitor device of the proposed design was stretched in time, which accordingly reduced its maximum charging current and ensured the achievement of the declared technical result for a given capacitor capacitance device.

Implement the graph of FIG. 2 is possible due to different variants of variation with parameters K, L and C. For example, if the first CES circuit, whose current curve ί ₂ has a relatively small capacitance C and inductance B, then the time 1 _{2 to} reach this circuit with a maximum charging current of 1 _{max 2} , ₃ will be relatively small compared to the second CES circuit, the charging current graph of which is ί ₃ , and in which, due to the increased inductance and capacitance, time 1 _{3 to} reach the maximum charging current of the capacitor device comes later than 1 ₂ , which is impossible, for example, availability in mustache the nature of one KHC circuit of a given capacity. The difference in the achievement of maximum currents in the CES-circuits of the device provides the proposed device durability, reliability and efficiency.

It is advantageous to use a capacitor device with a current-limiting function in most areas of electrical engineering, since its property — limiting the charging current — ensures that it increases

- 1 008525 personal lifetime, and power supply networks the quality of electricity with its reduced losses. The composition of the capacitor device includes well-known, non-deficient, widespread and inexpensive components. For the manufacture of this capacitor device there are well-known, waste and equipment provided by the equipment, which allows you to start the production of this type of product at a relatively low cost.

Sources of information taken into account

1. Renne V.T. Electric capacitors. L., 1969, p. 36, fig. 9; and c. 37, fig. ten.

2. Japan Patent No. 3436040, IPC ⁷ H0U 4/40, publ. 08/11/2003.

Claims (1)

A capacitor device with a current-limiting function, containing at least two parallel-connected CES circuits, consisting of series-connected elements of capacitive, active and inductive resistance, while the parameters of each of the CES circuits are such that the times of reaching the maximum charging and, respectively, discharge currents in the elements capacitance of different CES circuits have different values.