DE1817090A1 - Arrangement to protect series capacitors - Google Patents

Description

Arrangement to protect series capacitors

The invention "relates to an arrangement for protecting row capacitors in high voltage lines. Untur series capacitors This is understood to mean capacitors that are connected in series with the line and through which the line current flows «Since there are very none short-circuit currents in high-voltage lines can occur, which are 2u.lassig.en for the series capacitors Exceed the operating current, the capacitors must be Occurrence of overcurrents in the line short-circuited in good time to avoid destruction of the capacitors.

Overcurrent occurs in a high-voltage line, so, .toi _f _it the terminal voltage at the Konuei.i; jac-oren _o One can, uparmungsanütieg to control a So ^; ialt: -ii.'O use the one at überorfjfceigen der KlsnimenKpannuii ;; um uin, en gov / isüfci'i vJerb die ii ^ iaoruiondtjnsatoran lcurs ^ oalieib, - '^ r Koritrolia der Di> arü: ur.g axi the wedge condensators'is vori; cilhafi, _} üinü Fankenstroj ·' · - , au beiuitsGn, in whose x.l'vI-: tir. -yticoi dependent link, a.ii, a ütrorawandler, iiegx, dae LuI ■ ■ • ilr-r ^ xjii einoB overturn tax üt; r spark gap a oteuergurai usoinfiuut; which in turn

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shorting one to the series capacitors in parallel caused by lying switch and the short-circuiting switch opens again as soon as the line current sinks to a value that is permissible for the series capacitors. Since the overcurrents usually only have a very short duration, the short-circuiting one is .Switches opened again very quickly in such an arrangement, there is then the risk that the spark gap has never been deionized and normal between the Voltage prevailing at the capacitor terminals or one of these only

A little excess voltage initiates a renewed flashover of the spark gap and thus unnecessarily leads to a renewed short-circuiting of the series capacitors is turned off for sufficient for the deionization of the air-time at least, the lia'c responded to over-voltage and causes the series capacitor via a control unit, the ψ Kurzsohliei3en. In this way it is avoided that a not yet deionized tank path leads to an unnecessary short-circuiting of the series capacitor, but that on the other hand a spark gap is always ready for operation if overcurrents in the line should be repeated quickly,

According to one embodiment of the invention, both are parallel to the series capacitor lying spark gap circles a switch

909831/0929 BADORiGlNAL

and a s / tr-om-dependent device, "preferably a current transformer, to influence a control device that causes the actuation of the switch short-circuiting the capacitor. that once the short-circuiting switch is opened and on the other hand the switch of the spark gap circuit is opened for a sufficient time, which has _{responded o}

According to a second embodiment, the two Funkenstrecfcen- ^ circuits have different response voltages, so that normally only the spark gap circuit with the low ignition voltage appeals to. The second spark extender circuit is then switched on y when the short-circuiting switch is open and the circuit of the spark gap with low ignition voltage is interrupted will.

According to a further embodiment, both the spark gap circuits only have a current-dependent device, preferably a current i converter, and the switches of both radio link circuits are replaced duch a switch.

According to a further embodiment of the invention, in which also only one current-dependent G-erä-c for both spark gap circles is required, the spark gap circuits and their associated switches are cross-connected so that the switches both circles are in series. The switch in each case

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one spark gap is open, so only the spark gap can respond with the switch closed. When the mentioned spark gap is activated, the switch for the other spark gap is also activated closed, so that both switches lying parallel to the series capacitor short-circuit the series capacitor, a special one Switch is therefore not required for this »When the overcurrent subsides, the switch is then opened by the control unit, which is in series with the spark gap that has responded, so that a deionized spark gap is always ready for operation

is. As mentioned, this embodiment eliminates the need for a special switch for short-circuiting the series capacitor. The spark gap switches must be designed as ordinary switches so that they open the line current can pass over the series capacitor, i.e. in the same way as one for directly shorting the series capacitor serving switch ,,

Yier embodiments of the invention are hereinafter with reference to the drawing ψ described, wherein like parts are designated by like reference numerals in all four figures of the drawing _e

In Fig. 1, 1 denotes a high-voltage line and 2 an in series capacitor lying on this line. To protect the capacitor 2, a switch 3 is used, which is short-circuited when an overcurrent occurs. Used to control the switch a control unit 4, which in turn of two spark gaps 5 and

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is controlled. In the spark gap circle 5 there are a switch 7 and the secondary winding of a current transformer 9> whose primary winding is connected to the control unit 4, in the circle of the spark gap 6 there is a switch 8 and the secondary winding of a current transformer 9 whose primary winding is also connected to the control unit 4, _etc.

In the circuit of the switch 3 is the secondary winding of a Current transformer 11, the primary winding of which is connected to control unit 4 is «in line 1 on both sides of the Capacitor 2 one isolating switch 17 "or 18 and parallel to both of them a isolating switch 19» The purpose of these isolating switches is to to be able to switch off the ßeilienkondensator 2 without interrupting the line 1 of this.

The operation of the arrangement is as follows: When an overcurrent in the line 1, so the voltage on the spark gap circles "Does one of the two groups, Z ₀ B ₀ of the circle 5, so-causes a current flowing through the current transformer 9 Power The control unit 4 responds and the switch 3 closes. A high current now flows through the current transformer 11 to open. This can be done in such a short time that the radio link 'is deionized, but it can not also in such a case,' not yet 5 / ed Mx a V i he ignition of the spark gap 5 come when Sehalter opened 7, it will be from the control unit only after a while

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closed again, for a deionization of the spark gap is sufficient β For this time, however, the spark gap 6 is for operational in the event that a new high current is in the line should occur, which requires a short circuit of Schaltersι 3. The spark gaps 5 and 6 can have the same ignition voltage · .Man but can also choose different ignition voltages for both, so that the same spark gap always responds first. .-..-,

· The embodiment of Fig. 2 differs from that of FIG. 1 in only that is used for both Funkenstreckenkreise.eingemeinsamer current converter 12. This transducer is located in a branch line, which is traversed by the Stromgjtfeitx each spark gap ₀ The operation of the arrangement is the rest of the same as that of the arrangement according to FIG. 1.

When executing ^ form after. In Fig. 3 , as in Fig. 2, a common current transformer 12 is used for both spark gap circles 5 and 6 $ further are the two switches 7 and 8 replaced by a changeover switch 13 _? by which only one spark gap circle, in the drawing just the spark gap circle 5, is switched on. When the spark gap 5 responds, the switch 3 is short-circuited via the control device 4. When reopening. NEN of the switch 3 is the changeover switch, whose movable .Sc'haltorgan previously connected the contacts 14 and 16 to one another ,, on döii contact 15 _f so that the spark gap 5 is switched off and the spark gap 6 is switched on.

90983 1 / Ö92i ORIGINAL BATHROOM

In the embodiment according to Pig. 4 are the point ranges 5 and and "aiire 'associated switches 7 and 8 crosswise, i.e. according to Art a bridge circuit. 'The one for both spark gap circles common current transformer 12 is in one for "both circles common bridge branch With respect to the capacitor 2, both switches 7 and 8 and the spark gaps 5 and 6 are on the one hand on the other hand, each in series and parallel to capacitor 2. The secondary winding of the capacitor 11 is in the series connection of the switches 7 and 8, so that both switches in Pig. 1 to 3 Replace required switch 3. ™

The working of the arrangement according to Pig. 4 is the following: As the figure shows, switch 7 is initially the spark gap 5 closed, the scfceLter 8 of the spark gap is open. It can so only address the spark gap 5 in the event of an overcurrent. The control device 4 is excited via the current transformer 12. this device causes the switch 8 to close, so that the capacitor 2 is short-circuited by the switches 7 and 8. Sounds like the overcurrent from, the current transformer 11, through which the current from the switches 7 and 8 flows, now causes the switch to open 7, while the switch 8 remains closed. The short circuit of the The series capacitor is canceled, and it is now the spark gap 6 ready for operation, i.e. the spark gap that did not ignite, which is therefore deionized.

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Claims (4)

"ö"! §17090 patent claims; 1. Arrangement for the protection of series capacitors in high voltage electrical lines, characterized by a switch (3 or 7, 8) for short-circuiting the series capacitor (2) in the event of overcurrents, by a control device (4), which closes and opens the switch ( 3 or _o 7> 8) controls, and of which contains two lying parallel to the series capacitor spark gap circuits (5 "6)" each having a spark gap, a switch (7, 8) and a current-dependent device (9, 10) and both with the Control unit (4) are connected in such a way that when the series capacitor is short-circuited, the spark gap circuit is switched off for at least a sufficient time for deionization of the spark gap, which responds to an overvoltage and causes the series capacitor (2) to be short-circuited by the control unit (4) Has" 2. Arrangement according to claim 1, characterized in that in series with the circuit serving to short-circuit the capacitor _k ter (3 or 7i 8) there is a current-dependent device (11) which causes the short-circuiting switch to reopen via the control device (4) » 3. Arrangement according to claim 1, characterized in that a current transformer (9, 10) is located in each spark gap circle, whose Secondary winding is connected to the control unit (4). 4. Arrangement according to claim 1, characterized in that a current transformer (12) is switched on in a two spark gap circles (5, 6) common conductor, SO 9831/0929 -9- 5β arrangement according to claim 1, characterized, in that the switch for "both radio link circuits (5, 6), a common 'switch (13) is ₀ ■ ■ "% l ^s ' arrangement according to" claim 1, characterized in that the switch · (7, 8) of one of the two spark gap circles (5, 6) is connected in parallel to the spark pathB · of the other circle » Arrangement according to one of Claims 4, 5 or 6, characterized in that the spark gap of one spark gap circle (5, 6) has a slightly smaller offset than that of the other _e 3, 'arrangement "according to claim 1 and 6, characterized in that the switches (7, S)" of both spark gap circles in series
and 'also serve to short-circuit the BSW _o the' series capacitors (2). 9 0 9831 /09.29- Blank page