DE1946433C3 - Flip-flop surge arresters - Google Patents

Description

5. Surge arrester according to claim 2, that one of the other parallel current branches,
by in that the first coil (5) as it is, however, unfavorable possibility that the greater impedance both the larger domestic both ^Zwe: ge of such a flip-flop arrester inductance and the larger ohmic Wi · follow a Overvoltage at the same time overturn the stand. be able. Furthermore, if there is an arrester branch

6 Surge arrester according to one of the instructions, in which the spark gap units with claims 1 to 5 are characterized in that the coil (5) of a voltage-reducing circuit are in a branch (A) of the current, this branch does not even lie with the correct limiting spark gap arrangement, the actual value can overturn. Therefore, if there is a larger valve resistance (8) in series, a simultaneous flashover in the branches is switched next than a valve resistance (8 '). which occurs to and if both branches continue to conduct, the branch in which the second coil (5 ') is located. 35 after the spark gap is connected a substantial Boin series. have developed tension, then it works

Arrester not in the intended way. As a result the Zv / Eigspjnnung is the prescribed

Exceed values and the arrester voltage will.

40 now uncontrolled, exceeding the permitted limits. If the tension session is still not quite short. if the arcs remain in their

The invention relates to a flip-flop extended position so that the arc surge arrester with at least two paraiic chambers, the extinguishing capacity of the arrester and len branches that each have a current limiting 45 ultimately the arrester itself will be destroyed. It funkenstreckenanordnur.g each with a corresponding one thus clearly shows that the known arrester verden Magnetic blow-off coil connected in series opens when both branches of the flip-flop arrester assign, roll over together and then

A flip-flop surge arrester is included.

at least two electrical, if not even physical, 50 It is therefore the task of the present invention, The branches, rows or ends connected in parallel to create an improved arrangement in order to kel, each of which has at least one current limiting operation in parallel in flip-flop overvoltage spark gap or a spark gap arrangement to prevent littering. Continue to bcinhaiut this exhibit. A current limiting spark gap is a new and improved arrangement to invention a spark gap which, after a flashover, generates a 55 parallel branches of a flip-fop overpan counter voltage which, with their flashover arrester, have significantly different speed voltages is comparable. The build-up of these opposites for the build-up of a counter-tension to tension takes place at a time when you are long in giving.

Comparison to the duration of the front of an impulse span- These tasks are carried out with a FÜp-Flon-Über-

tion, such as B. a voltage surge through lightning surge arrester of the above-mentioned type crfindungseinschlag, but this is short compared to the duration solved in that a first coil a switching surge on a high-voltage over-spark gap and a second coil a valve support system. These surge arresters have a parallel resistance.
in particular for the derivation of high-voltage The invention will now be art hand of the following

encounter for a long time direct current high voltage 65 description and the drawings explained in more detail, transmission transmission systems can be used. The reason Fig. 1 is a schematic, graphic illustration

this is. that in normal operation by the position of a preferred embodiment of the He-switching shock generated leakage current periodically from detection;

if

Figs. ^1, 3, 4 and 5 are graphs showing the effects of the invention.

In Fig. 1 is a flip-flop surge arrester 1 e ₇ ei "t which is connected as an example between a conductor 2 of a high-voltage system, which can be a direct current high-voltage conductor, and earth, which has been designated by 3, schematically and in the form of a switch picture is Her arrester is parallel with two branches a and B Haroesiellt each having a StrombeerenzungsfunkentVpt-ke or Funkenstreckenanordnuns aulwei-In the StrombegrenzinKsfunkenstrecke a contains play four HörnerfV '; enslitcken 4 ,. 4 _{2,. 4:,} 4 ₄ with Ma _»! netb! asung. which are connected to each other and with a miniature blowpub J -. series. In the same way r «,, A the current limiting spark gap B vi .. spark gaps 4, '. 4 /, 4,', 4 / The coil 5 is a protective insert 6 of this type connected in parallel with a magnetic blower 5 ' the magnetic blowing effect on S light bow also builds up tension. Demfender coil 5 'of spark gap B a smaller valve resistance 7 paraM

fe ^ leich

kept that typically a little bit off

Valve resistance material with a diameter smaller inductance as well as the smaller auricular resistance quickly generates a current wirci. The coil 5 'builds up a magnetic field which is proportionally reinforced with the coil mandrel, as is shown in FIG. 4B. baclurui, the arcs of the spark gaps 4 are driven into the inner arcing chamber, and they develop a voltage fairly quickly, as it is in ri ₌ -

is shown. ,, .. i-Uel

xo In branch A ₁ in which the spark gap ö ρ ar «to the coil 5 lies, the ^v ° ^r S ^a " ^ lanesamer. During the rollover of this zavu ^

is "the spark gap 6 Åberge ^ car. Dk in this spark gap is small as jst shown in Fig. 3A as ^ <£ Naturally, the coil voltage equal, ^ UEIC voltage at the spark gap 6 ^ weri dc". buden initial stress the elements cherish directly parallel. ^Ful § ^'1L V * _ς., "ϊ-in resulting magnetic field from the nightmare au 5

><> is built, rice * · slowly, like Fig. 4A £}? This is furthermore due to the relatively large resistance and the inductive vital de.-coil. Therefore, the straight arc in the span 6 becomes relatively slow in d « L ^ * . gt ^ f

»L.ch bo, η funkensirecken 4 r el an ^ slow gtsi, long. Before the Uh turned atr

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their inductance is greater than the corresponding S ⁵

B reach the

^ eSSTS.-. a TeU of the Strombeg.n.ngsfunkenbereich A a circuit is provided that reduces the voltage before. This circuit includes de impedances Z ₁ , Z ... Z _: “Z ₄ . the one. a main spark gap 4 _{r 4 r} 4. ,, 4 _{4 lying in R} i are connected in parallel. In the same way, the current-limiting spark gap contains an internal circuit _{to reduce the voltage;} Al S kelneiiepen HlüptÄnstrecken 4, '. 4th, ', 4 _π '. 4 / are connected in parallel. Although it is not necessary. Each leg comprises a valve resistor connected in series, which is shown as wideband 8 for branch A and as \ V, the other _S nd 8 'for branch A. Preferably, the ohmic resistance of the resistor 8 is again greater than the ohmic resistance of the W, -sen state ^

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only partially completed

Arc voltage

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% fiZLr ic shown widely with a common branch consisting of a common valve

SräV-rS is the same rollover the mode of operation in Figs. 2, 3, 4 and 5

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Applied in microseconds. After a parallchπ With a flashover, the current begins to flow through the arrester and is distributed to the two branches. wi it in fig. 2 A and 2 B shown ^^ In Two P's, the current flow immediately creates a small entrance SpunnutgsabfaH at the valve resistor 7 dargesteüt ^ 3 ^

point T ₁ in1 F. i - ^ A uk ρ _{k] dn}

^^^ £ ^ r in Fi _E. 2 A represents ^ _{that the} , disguised Ab _{e changes microsecurity-}

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^^^^^ or against the operating voltage _> -lock. ^W - ₍ , .- '^ n ^ ne 5 A ^! ^^^^^ rZi ^ nnung. Da the

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£; S? _{n ^[CHT:} nierbrüchen ^r _U, the current of its coil s n.cnt _nar, M, ien valve

with coil 5 can _nn d _dtf - _N1 , _{nuB nich} ,

widerstana / niu spark

^Z ^ ^% _{Mr. This} slows down the release process.

when the branch current reaches lower values. This is shown in FIGS. 3B and 4B, where the coil voltage is reversed after the Zettpunkt T ₁ and continues to push current through the coil and the resistor 7 so that the magnetic flux does not drop to zero at time T _1. The "is not the same as cause for the coil of the spark gap A. The different Wärkwiderstandsweile <ler Ventilwiderständc 8 titid ö 'and that Ableiterspannung in the branches A and B developed at different speeds. This inequality has the consequence that a larger current flows in branch B than in branch A when the first parallel operation occurs. The spark gaps with the smaller current tend to develop the voltage more slowly, while the spark gap !! the higher the current, the faster the voltage can be built up. The reason for this is seen in the fact that the arcs are denser with larger currents and therefore the magnetic flux generates a greater force on the arcs. Furthermore, the local magnetic field, which is generated by the current flow in the Fujjkcnstreckenelektodcn, has the effect of the arc in the direction to press on the arc chamber. This effect increases as the current increases.

It should be mentioned that the valve resistors 8 and 8 ' not necessarily, an unequal resistance value must have. The same resistors can be used, with only it has to be taken into account that the, a coil a Spark gap and the other a country of resistance is connected in parallel.

On the other hand, if unequal valve resistances are used in the legs or branches, then is it is generally desirable, but not absolutely necessary, to have unequal current limiting functions to use in the branches.

Even if the flip-flop arrester has more than two branches, it is still possible that a simultaneous flashover of all branches can occur. It should therefore be mentioned that the present invention is not limited to a double-ended FlSp-Flop arrester and that at least one of them should correspond to branch B and the others should be like branch A regardless of the number of Schenks used .

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1 sheet of drawings

Claims (4)

one branch to the other passed back and forth Claims: will. This is where the name flip-flop comes from. This flip-flop effect prevents overheating of the 1. Flip-flop surge arrester with minimum current-limiting spark gap, so that the arrester at least two parallel branches, each of which can dissipate a 5 more energy than if the whole Current limiting spark gap arrangement with each energy continuously over the spark gaps from one corresponding series connected Ma- would be directed. Have gnetblasspule, thereby marked- Such an overvoltage protection device is indicates that a first coil (5) is a fun from French patent specification 1 530 513 kenstrecke (6) and a second coil (50 an io knows. This known device has at least Valve resistor (7) is connected in parallel. two parallel-connected branches with at least 2. Surge arrester according to claim 1, there being a spark that works with current limiting characterized in that the first coil (S) extends in each branch of the current. Each of these pareine has a much greater impedance than allelic branches has a negative resistance second spool (5 '). 15 Stand characteristics. After an ignition it then builds 3. Surge arrester according to claim 2, that each of the spark gaps quickly has a counter voltage characterized in that the first coil (5) with over its current branch, which together with the the larger impedance also the larger inductive voltage drop one with the parallel connected exhibits activity. Branches of the valve resistance in series 4. L'overvoltage ^ arrester according to claim 2, da- ao results in a total voltage which the ignition chip through characterized in that the first coil (5) exceeds the voltage of the other spark gap. Through this the larger impedance also the larger ohms, every spark gap forces after its excitation see resistance. a rapid diversion of the current surge to a minimum