AD-A*98 45 FOREIGN TECHNIOLOGY DIV WRIGHT-PATTERSON AFB OH F/6 9/1 SWITCHING THE CIRCUIT OF AN INDUCTIVE ENERGY STORE USING A VACU--ETC(U) FEB 85 A V
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1 AD-A*98 45 FOREIGN TECHNIOLOGY DIV WRIGHT-PATTERSON AFB OH F/6 9/1 SWITCHING THE CIRCUIT OF AN INDUCTIVE ENERGY STORE USING A VACU--ETC(U) FEB 85 A V REYNERS, A A TSVETKOVA, Y P IVANOV UNCSIIE SSDIFIEDFTD1D( S)TI% G AIP *fl~ ND
2 1,U * fj1 MICROCOPY RESOLUTION TEST CHART
3 FTD- ID( T FOREIGN TECHNOLOGY DIVISION < 00 SWITCHING THE CIRCUIT OF AN INDUCTIVE ENERGY STORE USING A VACUUM SWITCH by A. V. Reymers, A. A. Tsvetkova, et al. D Tr ELET j V Approved for public release; distribution unlimited
4 FID -ID(H3S)T EDITED TRAM5ILATION (j 7 (FTD-ID(RS)T-196,A Febjkv 1981 '.4MICROFICHE NR: FTD-81 -C L 4WITCHING THE IRCUIT OF AN NDUCTIVE NERGY) STORE V~SING A ACU 1IT CII A. V. Reymers j A. A./Tsvetkova, al-.- tll, Engl s--a -.. Country of origin: USSR,,4/ Aecession For Translated by: Gale M. Weisenbarger, ' "- NTIS GRA&I Requester: FTD/TQTD DTIC TAB Approved for public release, distribution Unanccrced unlimited. U iuf tification By- y - Distribution/ AvailabilitY Co des Avail and/cr Dist Special +'4 THIS TRANSLATION IS A RENDITION OF THE ORIGI. NAL FOREIGN TEXT WITHOUT ANY ANALYTICAL OR EDITORIAL COMMENT. STATEMENTS OR THEORIES PREPARED BY: ADVOCATEDOR IMPLIEDARE THOSE OF THE SOURCE ANDDO NOT NECESSARILY REFLECT THE POSITION TRANSLATION DIVISION OR OPINION OF THE FOREIGN TECHNOLOGY DI. FOREIGN TECHNOLOGY DIVISION VISION. WP.AFS, OHIO. FTD-ID(R-S T-196o-8o Date 25 r-et jlj(
5 U. S. BOARD ON GEOGRAPHIC NAMES TRANSLITERATION SYSTEM Block Italic Transliteration Block Italic Transliterati A a A a A, a P p p p R, r b 6 BE 6 B, b C c C C S s B B Be V v T T T m T t F r r G, g Y y y y Up u D, d 0 Fpf - E e E a Ye, ye; E, e* X x X x Kh, kh N AV Zh, zh LALA L 11 Ts, ts a Z. z q V Ch, ch H /u I, i I W 1W9 Sh, sh 1 1 *1 Y, y W ug I q Shch, shch H K K x K, k b B Sjj ) 7 L,1 M1e Y, y M m A P m b b HH Hee N, n 3-9 E, e O o 0 0 O, 0 k] N 0 so Yu, yu n n 17 x P, p R R 0 a Ya, ya *ye initially, after vowels, and after b, b; e elsewhere. When written as 6 in Russian, transliterate as y6 or 9. RUSSIAN AND ZNGLISH TRIGONOMETRIC FUNCTIONS S Russian English Russian English Russian Eng]I.. sin sin sh sinh arc sh sinh cos cos ch cosh arc ch cosh-, tg tan th tanh arc th tann ctg cot cth coth arc cth cot-,-, sec sec sch sech arc sch sech_ cosec csc csch csch arc csch esch Russian English *.lg log rot curl L I '
6 - -.7 DOC = 1960 PAGE I 1960,gw SWIT HING TIE CIRCUIT OF AN INDUCTIVE ENERGY STORE USING A VACUUM f SWITCH A. V. Reymers, A. A. Tsvetkova, Yu. P. Ivanov, and V. P. Zhilltsov Moscow When using a pulse generator with an inductive energy store great difficulties are caused by the effective breaking of its 4 electrical circuit. It is interesting to investigate the possibility of using a vacuum switch for this purpose [1]. As is known, *pulse extinguishing of an arc in a vacuuw switch takes place at the moment of passage of the current through zero. In the case of installation of such a switch in direct-current circuits (in particular, in a gensrator with an induct.ve energy store) the transition through zero is achieved by the use of a special extinguishing device which is a capacitor bank discharging to the switch at the necessary momcat (2]. The expeidiolncy of using a switch cf a given type in tho circuit of an inductivo engrgy stcro is datorminad to a significant
7 DOC = 1960 PAGE 2 3egree by the size and cest of the auxiliary capacitor bank. The basic task of this article is to determin.e the necessary energy of the capacitor of the extinguishirg device during switching of the circuit of the inductive energy stcre with a vacuum switch. A diagram of the simplest extinguishing circuit, connected to the circuit of an inductive energy store, is shown in Fig. 1. Curves of thq recovery voltage and the current through the switch during discharge of the capacitor of the extinguishing circuit in a simplified form are shown in Fig. 2. RI L Fig. 1. Diagram of the switching cf the circuit of an inductiv4 energy store with a linear extinguishing circuit LC. C - capacitor of the extinguishing circuit; L - choke of the extinguishing circuit; B - vacuum switch; L o - energy store; P - dischargor; R - load resistance; R - charge resistance.
8 , DOC = 1960 P'GE 3 Fig. 2. Curves of the current and recovery voltage. I - in the presanca of a linear extinguishing circuit LC; 2 - in the presence% of an cxt.nguishing circuit with a saturating choke '30Mn cex *Fig. 3. Oscillograms of vcltage and current in th. circuit of a vacuum arc-extinguishing chairbr (extinguishirg circuit with a S-!I II I I I I 1
9 DOC = 1960 PAGE 4 saturating choke). KEY: 1. ps. The duration of the switching rrocqss (as a result of which 'hccurrent in the switch is decreased from I* to 0, and in the load increasis from 0 to 10) is determined by the sum of the time of currant drop and the voltage reccvery time: A 2 where T - period of oscillaticns cf thr; extinguishing circuit; C - capacitance of the capacitor of the extinguishing circuit; current to be switched; U.,,v.IoF" - maximum voltage on the Icad with a resistance of R. ; a - a certain coefficient depending on the moment of connection of the load (subsequently we shall consider that 4 a,1, which is justificid if the Icad is connected at the moment whin the recovery voltage is close tc U,, ). The minimum duration of switching necessary for successful disconnection may be examined as a characteristic of a switch of a given type. LOt us determine the dependence between energy for which the i.....
10 DOC 1960 PAGE 5 capacitor of the extinguishing circuit must be designed and the duration of switching. The necessary capacitance of the capacitor of the extinguishing circuit is found from the relationship (2) C 2Uwhere U. is the initial voltage en the capacitor of the extinguishing circuit. It is not difficult tc shcw that energy E, stored in the capacitor of the extinguishing circuit will be minimum with Uo=U * Taking into account (1) and (2) we find: (3) 2 + Et 2 - Ix t where Lo is the inductancq of the energy store; 2 2 R* Thus the energy stored In the capacitor cf the extinguishing circuit is proportional to the switching time. Relationship (3) may be written in a somewhat different form if we introduce the concept of tha limiting frequency of the extinguishing circuit: MCC=
11 DOC = 1960 PAGE 6 (14) E, R 0 ui*tawharp I I( fri Along with the simplest diagram of the extinguishing circuit examined above it is possible tc use other diagrams which provide better conditions for extinguisbirg ths arc in the switch. For exattile, in the presence of a saturating choke in the switch circuit [3] w! obs.rvc that the current and tho recovery voltage are approximate.ly P-qual to zero during the switching period... A similar effect takes place wben we use an artificial line as the extinguishing circuit. It is not Oifficult to show that for the indicated diagrams the switching duration is equal to t, 2Cl11, 1. = 201- (npu1,,,.z U.). 4 The necessary energy of the capacitor ofthe extinguishing circuit is determined by a relaticnship analogous to (3): E, f. (5) 2 % I i i9
12 DOC 1960 PAGE 7 From rolationships (3)- (5) it is i-vidant that for evaluating th3 energy of the capacitor cf the extinguishing circuit it is necessary to know the minimum switching duration tk (or the limiting frequency The indicated values were determined experimentally for * vacuum arc-x.xtinguishing chavhrrs cf thr type KDV-12M. The diagram of Lt:;sts is aralogous to that shcwn in Fig. 1 with the differcnce that the current in the circuit of the tested chamter was created by discharging a bank of capacitcrs wlth a capacitance of C=1400 pf; the inductance of the store L o was 0.25 mh. It should be noted that the employed method did not completaly reproduce the conditicns of cperaticn of the switch in the circuit of the inductive energy store since in the process of testing a stage of prolonged passage of the current through closed contacts during the accumulation of energy was absent. For eliminating powerful heating of the contacts of the vacuum arc-extinguishing chamber it may be -4 necessary to shunt it using a sulflementary commutator, which breaks just bafore triggering of the vacuum switch. During the tests the contacts of the vacuum arc-extinguishing chamber were separated simultancously with the beginning of discharge of the capacitor bank which led tc the aprearance of an arc between them. rho discharge of the ca acitcrs of the arc-extinguishiig circuit was realized at the moment when the distance between the
13 DOC 1960 PAGE 8 contacts of the chamber reached 2-3 mm. As a rule, this moment correspondrd to the maximum current in the circuit of the chamber which arrived one millisecond after the beginning of dischargq of the basic capacitor bank. In the cour-e of the experiments it was established that the duraticn of fuming of thq arc Letween the contact greatly affects the maxiriux switchable current. For example, with a decrease in the duraticn of burning of the arc from 4 to 1 ms the raximum switchable current increased approximately 1.5 times. A relatively small arc time (I ms) was achieved by rapid breaking of the chamber ccntacts using a special electrodynamic drive, consisting of two coils, mutually rppelling each other during discharge on them of a caracitor vith a capacitance of 100 pf charged to a voltage of 1.5 kv. The resistance of the load connected through the discharger with a breakdown voltage of about 20 kv, was 5 Q. The initial voltagi on the capacitor of the extinguishipg circuit was selected in th3 limits of kv. Along with the diagram depicted in Fig. I a diagram was tested with a saturating choke which was ccnnected to the circuit of the arc-extinquishing chamber (in this case choke L was absent).
14 DOC 1960 P AGF 9 In the coirse of the ox~eriwents w- recorded the current ir the circuit of thp vacuum arc-axtin s-hing charnber and the recovpry volt q; on an oscillcgraph (Fig, 3). Th3 switchred current was def.nrcd as the current preceding the moment of triggering of the extircguishing circuit. The l!miti gr, curcent wes taken as the current correspon1 ng to 90 0/0 s.uccessful disconn-.ctions. Thn switching duration was deternined from the cscillograms from the moment of the initial current drop to the mcment when tha maximum recovery voltage was rcached. Thz results cf the tests have been reduced to a table. Z-) A NITiiTVrA H 1Iki-ro raim, 'I 10[ h ONM Ta" OT- 1411JBnlBk)- U n exm MIY A Wr-l a. C nolca,1.4 ApOCCCIeM , ,8 4, ,5 15 3, 25 C, 3-G32 6,3 23 [UnIOrMIMCH , ,2 24 KEY: 1. typo of circuit; 2. capecitanc: of the extinguishing circuit; 3. frru,,1cncy of tho extinguishirg circuit, kiiz; 4. switching tine, pc;; 5, t:a-i.iaum switchabiv current, ka; 6. aunplitude of recovery volt9cgo, V; 7. with linear cho)hs; 8. with saturating choke.
15 DOC 1960 PAGE 10 In the absence of a lead (Ba - the voltage may be restored to a very large value; in this case a breakdown cccurred between the contacts of the chamber with a voltagi of kv. From the table it is evident that the maximum switchable current d~pends little on the freque.ncy cf the extinguishing circuit in the limits of 8-14 khz; a significant decrease of the switchable current occurred at frequencies of the extinguishing circuit of 30 khz and greater. With a given capacitance of the capacitor of the extinguishing circuit the use of a saturating chcke makes pcssible a certain increas3 of the switchatle current. It is interesting that with an increase of the duration of switcbing to 500 ps the siitchable current rose only to 7 ka. On the basis of the obtained data it is j:ossible to select th!? switthing durati.on and to evaluate the energy for which the capacitor bank of the extinguishing circuit must be designed. Apparently th% use of a,;vitch vith an cxtinguishing circuit in the circuit of the inductivq store is expedint under the condition that the energy of
16 DOC 1960 PAGE 11 the capacitors of the extinguishing circuit is at least an order less than thv enorgy stored in the inductive store. From experimental data given in the table and frcm relaticnships (3)-(5) it follows that tha ind.zatsd ccndition for the investigatcd vacuum switch will be observ-d if the duration cf the discharge of the inductive store r is -* hundreis of microseconds and greater. I! E, I (For example, with fp.j1o khz =0. 1; E,- LITERATURE 1. l on o A.. BaKyynue BUKJoqaTIH. H3A-BO Sfepri $1*, 1%5. 2. B ep e n a r, ii I1, 11.,.I\ai =3 Tpa c jcpmatoplo cxemu 1ItlyKTIB11oro itakon;qte.ng 3a~eprim, "TpyAu M3h4, Hi'-. 45, t3jex- Tpo03eprer"Ka,, Ilauammt R.. Ciinarfion r. A.. Be3Ayronoe OTI. Joqeume 6ozbiwjx TOKO. ( e.nexponexlhka No 9. 4
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