UA63747C2 - Current pulse generator - Google Patents

Abstract

The proposed current pulse generator contains a capacitive power accumulator, a discharger, a load switch with an additional discharger, and additionally, a corrective capacitor, which is connected in parallel with the additional discharger. The proposed generator is distinctive by enhanced stability of current pulses, improved conditions for controlling voltage, and simplified design.

Description

The proposed generator of pulsed currents is intended for use in electrical engineering, in particular, in high-voltage pulsed technology for the formation of pulses of lightning currents and test pulsed magnetic fields for physical research.

Known generators of impulse currents used in various electrophysical installations for: - magnetic - impulse processing of metals (1); - obtaining plasma (21; - testing various equipment for resistance to the action of lightning discharges ІІІ. As for the known generators of impulse currents, the generator that consists of a capacitive energy store, a main discharger, an active-inductive load and a load breaker with auxiliary discharger |41.

To obtain the maximum amplitude of the current pulse in an active - inductive load, the auxiliary arrester of the circuit breaker must withstand the high voltage applied to it during the formation of the current pulse and operate when the front of the current pulse is formed in the load, that is, when the current in the load reaches its maximum value, and the voltage on the auxiliary arrester will be close to zero. This mode of operation of the pulse current generator is provided by a special starting unit that controls the auxiliary discharger, which complicates the generator and is its significant disadvantage.

The task of the proposed invention is to simplify the scheme and design of the pulse current generator and increase its efficiency.

The technical result is achieved by the fact that in the generator of impulse currents, which includes a capacitive energy store, the main discharger, an active - inductive load and a load breaker with an auxiliary discharger, a correction capacitor is turned on in parallel with the auxiliary discharger.

In fig. 1 shows the basic electrical diagram of the proposed pulse current generator.

The generator of impulse currents consists of a capacitive stored energy, which has capacity 1, inductance 2, active resistance 3, the main discharger 4, an active - inductive load, which has active resistance 5 and inductance b, a load breaker, which has active resistance 7, inductance 8 , the auxiliary discharger 9 with the correction capacitor 10 turned on in parallel with it. The capacity of the correction capacitor 10 is 5-10 times less than the capacity of the capacitor 1.

In Fig. 2, dotted curves 11, 13 depict the corresponding forms of current pulses In in the load, which has active resistance 5 and inductance b, and voltage Or on the auxiliary arrester 9 of the load breaker in the absence of the correction capacitor 10, and solid curves 12, 14 respectively depict forms of the same current and voltage pulses in the presence of a correction capacitor 10. i

In Fig. 2, the following designations of pulses are adopted when connecting the correction capacitor 10:

Io, Yikh - maximum pulses of the current In in the load;

Sho, Ok - maximum pulses of voltage Or on the auxiliary arrester; to, tk - Duration of the front of the current pulses Inv load;

Air-to » Ak - time intervals between the maximum voltage Or on the auxiliary arrester 9 and the maximum current In in the load.

Notation on . Fig. 2 with the index "o" refer to the amplitude-time parameters of the pulses of current In and voltage Or, which they have in the absence of the correction capacitor 10, and with the index "k" - in its presence. These curves for current pulses In and voltage Or reproduce the situation when the arrester 9 does not trigger.

The pulse current generator works as follows. From the charged capacity 1, the accumulated energy after the operation of the main arrester 4 begins to increase the voltage Or on the auxiliary arrester 9 and the current In in the inductive-active load, which consists of an active resistance 5 and inductance 6, but the increase in current lags behind the increase in voltage.

When the auxiliary arrester 9 is activated, there is a delay in the moment of activation of the arrester 9 (the moment of the appearance of current in it) in relation to the moment of appearance of voltage on it.

The delay at a given voltage depends on the size of the gap of the arrester 9, so it is possible to adjust the size of the gap in such a way that the tripping will be near the maximum current in the load of the arrester 9.

Turning on the correction capacitor 10 reduces the time interval between the current and voltage maxima (Ayu » Aik), which significantly increases the stability of operation of the auxiliary arrester 9 and facilitates regulation of its operation voltage. After the operation of the auxiliary arrester 9, the character of the change in the current in the load, formed by the inductance b and the active resistance 5, is no different from the prototype. With the appropriate choice of ratios between the values of the elements of the circuit in drawing 1, the current will relatively slowly decrease to zero according to the exponential law with the imposition of minor fluctuations. An almost aperiodic current pulse of long duration with a short front is formed.

The use of an active-inductive load breaker with an uncontrolled auxiliary discharger 9 and a correction capacitor 10 connected in parallel to it in the pulse current generator instead of the auxiliary discharger 9 controlled by the starter unit in the prototype allows to simplify the scheme and design of the generator and increase the stability of its operation. In addition, the use of the correction capacitor 10 improves the parameters of the pulse current In in the load, namely, its maximum (I" "Io) increases and the duration of the front decreases (tk " to), which increases the efficiency of the pulse current generator.

The proposed generator of pulsed currents can form pulsed magnetic fields with studied plasmas or test pulses, imitating lightning current according to the requirements of DSTU 3681 - 98 |5I.

References 1. Belii I.V., Fertyk SM., Khimenko L.T. Handbook on magnetic pulse processing of metals. -

Kharkov: Higher School, 1977. - 168p. 2. Kremnev V.V., Mesias G.A. Methods of multiplication and transformation of pulses in high-current electronics.

- Novosibirsk: Nauka, 1987. - 2266.

Z. Kuzhekin I.P. Test installations and measurements at high voltage. - M.: Znergia, 1980. - 136 p. 4. Dashuk P.P., Zayents S.L, Komelkov V.S. etc. Technique of large impulse currents and magnetic fields. -

M.: Atomizdat, 1970. - 4726. 5. DSTU 3681-98. Resistance to lightning discharges. Technical requirements and test methods. State Standard

of Ukraine, Kyiv, 1998.- 276. 3. 4 5 7 2 6 8 1-5: In schi TO sli i in v, is, pi m! Oh! N whose

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Claims (1)

A generator of pulsed currents, which includes a capacitive energy store, a main discharger, an active-inductive load and a load breaker with an auxiliary discharger, which is characterized by the fact that a correction capacitor is turned on in parallel with the auxiliary discharger