Tripping device for high-voltage gas-insulated distribution switchboard

专利摘要:
The invention relates to electrical engineering, in particular to disconnectors for a high-voltage gas-insulated switchgear in a metal housing. To isolate high-frequency oscillations at the start of the initial breakdown arc, there are two electrically connected or connected to one of the contact elements of the resistor 12 lying on the longitudinal axis. In addition, the mobile insulating tube largely closes the gap before the resistors 12 come into contact one with the other. The purpose of the invention is to achieve the desired value of resistance. Each resistor 12 is made of several elements 16 located between two contact discs 24 located at the ends and powered by a curable resin 26. Each element 16 consists of a ceramic plate 17 with strips 18 of resistive material which, respectively, have contacts 21 on the edges, 22. 5 CU. f-ly, 3 ill. cr o (pus. 2
公开号:SU1327805A3
申请号:SU853856894
申请日:1985-02-13
公开日:1987-07-30
发明作者:Шульц Винфрид
申请人:Сименс Аг (Фирма)；
IPC主号:

专利说明:

The invention relates to a disconnector for high-voltage gas-insulated switchgears in a metal housing with cylindrical contact elements; which are made of or are covered by field electrodes, with a movable insulating tube installed inside the contact element or field electrode closes the gaps between the contact elements while the contact elements are moving, as well as with two electrically lying on the longitudinal axis connected with one of the contact elements or having the ability to connect approximately the same in size with movable resistors that have a thermally well-conducting ceramic base, the outer dimensions of which are smaller than the inner diameter of the insulating pipe and that are introduced into the contact movement during switching The gaps between the contacts and they, after a considerable overlap of the solution of the contacts by an insulating pipe, are also inserted, the previous pipe 9 and the movable contact element 7 is inside the electrodes 4 and 5 of the floor and thus does not protrude into the gap 6. Thus, the electric field inside the gap 6 depends on the shape of the electrodes 4 and 5 the floor and is not distorted by the presence of 1 min inside the elements
What are the opposite contact elements that come into contact with one another or with the electrodes of the floor Thanks to these resistors built into the disconnector, high-frequency resonant oscillations are eliminated.
The purpose of the invention is to achieve the required value of resistance with a small volume and high dielectric strength and temperature resistance.
Fig, I shows the proposed disconnector, longitudinal section; Fig. 2 is a perspective view of a resistor used in this disconnector; partial section} in Fig. 3 is an external view of one of the plates from which the resistor is assembled.
A high-voltage switchgear installed in a metal casing and insulated with compressed gas, for example an SF6 gas, contains a disconnector 1 located inside a metal grounded casing 2. In FIG. 1, it is presented in the switching position, at which the initial breakdown arc 3 occurs. Disconnector 1 has two coaxial opposites one
a cage of cylindrical electrodes 4 and 5, between which there is a gap 6 (indicated by arrows), free in the off position of the disconnector 1; Inside the right electrode 5 of the floor there is a movable contact element 7 in the herme of the contact tube, which is electrically connected with the sliding contact .8 electrode 5 floor and thus has the same potential as this electrode.
Inside the stationary left electrode 4, the floor is a movable insulating pipe 9, the outer diameter of which is smaller than the diameter of the edge 10 of the hole in the electrode 4 floor. In addition, on the longitudinal axis of the electrodes 4 and 5 of the floor there are two conductive movable rods 11, which at their ends are facing a discontinuity 6, several, two cylindrical resistors. There is, respectively, a conductive connection between the electrodes 4 and 5 of the field and the terminals 11 with resistors 12, so that the resistors 12 also have the potential of the electrodes 4 and 5 of the field, In the upper position of the disconnector both resistors 2 and 0
five
five
element 7 are inside the electrodes 4 and 5, the field and thus do not protrude into the gap 6. Thus, the electric field inside the gap 6 depends on the shape of the electrodes 4 and 5 and the field is not distorted if there are 1Ms inside the elements
At the beginning of the switching on movement, first of all, with the help of a not shown water, only the insulating tube 9 from the electrode 4 field is pulled out to the gap until it reaches the end position, which reaches the opposite electrode 5 floor
5 has a distance of 13 (indicated by arrows). This distance 13 is chosen such that no sliding spark can appear on the surface of the insulating pipe 9.
Q After that, using reducible rods 11, both resistors 12 are symmetrically introduced from two sides into the gap 6. Due to this, the residual gap 14 that lies between their ends,
g is, respectively, in the middle of discontinuity 6. When this residual discontinuity 14 becomes sufficiently small, an initial breakdown arc 3 arises between two resistive disks 7
12, the displacement of the initial breakdown arc 3 to the metal housing 2 is impossible, since it is shielded by an insulating tube 9. The resulting symmetrical damping due to the resistors 12 during ignition or when the initial breakdown arc 3 is re-ignited prevents high-frequency vibrations or intensely extinguishes.
As the switching movement continues, both resistors 12 are in contact at the ends of the metal contacts 15, the moving contact is brought into contact with the floor electrode 4 and, moreover, the insulating tube 9 is retracted again. Thus, the passage of the operating current in the closed position of the disconnector 1 occurs from the electrode 4 field through the movable contact element 7 to the electrode 5 field so that the Joule heat can be freely transferred outside. When disconnector 1 is opened, the movement of individual elements occurs in the reverse sequence, so that more than once re-igniting arcs that occur during shutdown are again found between resistors 12, slowly moving from one another.
Constructive design of resistors 12 can be seen in FIGS. 2 and 3. Each resistor 12 is assembled from several elements 16. Each element 16 consists of rectangular plates I7 of thermally well-conducting ceramics, for example, AJEj Oj, obtained by burning two strips into its two surfaces.
18 out of pasty resistive material.
The firing strip 18 is zigzagged from one edge 19 of the plate to the opposite edge 20, since the strips 18 on the two surfaces of the plate 17 pass congruently at the points of contact with the edges
19 and 20 are respectively connected by a metal contact 21 to each other in such a way that they are respectively connected in parallel, At the beginning and at. A larger area metal contact 22 is provided at the end of the strips 18, which respectively extends to the end edges 23 of the plate 17
Several elements 16 are located one next to the other at some distance between the two end faces.
0
five
five
0
five
0
five
0
five
 copper discs 24, In addition, the contact discs 24 on one side are provided with parallel slots 25 in which the end edges 23 of the plates 17 enter, so that an electrical contact is made between the metal contacts 22 at the ends of the strips 18 and contact disks 24, All elements 16 are electrically connected in parallel. The entire device is then poured with a curable cast resin 26, such as epoxy, so that the resistor 12 forms a cylinder. At the same time, to obtain an electrical connection between the rods 1 1 and resistors 12, respectively, the outer surface of the contact disks 24 is left free of resin
If plate 17 is selected for resistor 12 thus made, with an end width of about 50 mm and a length of about 100 mm, then using resistive paste, for example, C 300 OHM per unit area and zigzag arrangement of strips, as shown in FIG. 3, with parallel switching of bands lying on two sides, a resistance value of 7.5 kΩ is obtained for each element. Then, by appropriate selection of the number of elements 16, the desired resistance value can be set.

权利要求:
Claims (6)
[1]
Invention Formula
, A disconnector for a high-voltage gas-insulated switchgear in a metal case, containing cylindrical contact elements made in the form of field electrodes or field elements surrounded by these electrodes, a movable insulating tube located inside the contact element or excitation electrode, which in the process of switching closes mainly the gap between contact elements at the time of their movement, and two electrically connected or lying on the longitudinal axis POSSIBILITY compound with one of the contact elements of equal magnitude movable resistor that are provided with good thermally conductive ceramic frame having an external diameter smaller resistors
diameter of the insulating tube, while the resistors are arranged so that at the beginning of the switching they are inserted into the gap, and then they overlap with the insulating tube until contact with one another or with the excitation electrodes occurs, in that achieving the required value of resistance at low volume with high dielectric strength and temperature resistance, each resistor is made of several elements located at a distance from one another between two metallic they face contact disks, each element made in the form of a ceramic plate and a strip of resistive material connected to contact disks flooded with a curable casting mixture so that the contact disks are outside in contact,
[2]
2. A disconnector according to claim 1, characterized in that the strips of resistive material are arranged in a zigzag form on a ceramic plate,
[3]
3. Disconnector according to claim 2, that is, in that the said bands are located on both sides of the plate congruently and laterally connected to one another with a metal.
[4]
4. The disconnector according to claim 1, wherein the contact disks are provided with slots on one side for securing the plates.
[5]
5. Disconnector according to claim 4, characterized in that the contact disks are made of copper.
[6]
6. Disconnector according to claim 1, in accordance with the fact that the resistor is designed as a cylinder.
22
(pus. 1
Compiled by V.Popova Editor M.Petrova Tehred L.Serdyukova Proofreader T.Kolb
Order 3396/59 Circulation 698 Subscription
VNIIPI USSR State Committee
for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5
Production and printing company, Uzhgorod, st. Project, 4
jig

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引用文献:

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FR478423A|1914-04-24|1915-12-10|Georges Giles|Resistor open air switch|

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DE822690C|1949-11-08|1951-11-26|Theodor Conrad|Switching pin for electrical alternating current switch|

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CA678008A|1960-02-05|1964-01-14|Westinghouse Electric Corporation|Circuit interrupters|

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DE1216972B|1960-07-25|1966-05-18|Siemens Ag|Electrical resistance for high pulse loads|

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US3143622A|1960-10-28|1964-08-04|Westinghouse Electric Corp|Arc-extinguishing unit and contact structure for a circuit interrupter|

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DE2704389C3|1977-01-31|1980-06-26|Siemens Ag, 1000 Berlin Und 8000 Muenchen|Disconnector for metal-enclosed high-voltage switchgear|

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DE3331819A1|1983-09-01|1985-03-21|Siemens AG, 1000 Berlin und 8000 München|DISCONNECTOR FOR METAL-ENCLOSED, COMPRESSED-GAS INSULATED HIGH-VOLTAGE SWITCHGEAR|JPH0622365B2|1985-11-22|1994-03-23|日新電機株式会社|Gas insulation device|

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CH693051A5|1995-06-09|2003-01-31|Rockwell Automation Ag|Resistor arrangement at a given for switching capacitive loads electromagnetic switching device.|

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DE19543815A1|1995-11-24|1997-05-28|Asea Brown Boveri|Electrical switching device|

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FR2753833B1|1996-09-20|1998-10-23|GENERATOR CIRCUIT BREAKER WITH VARIABLE DAMPING RESISTANCE|

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EP1973133A3|2007-03-22|2009-11-11|Korea Electro Technology Research Institute|Circuit breaker using arc contact|

法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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DE19843405850|DE3405850A1|1984-02-16|1984-02-16|DISCONNECTOR FOR METAL-ENCLOSED, COMPRESSED-GAS INSULATED HIGH-VOLTAGE SWITCHGEAR|

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