Disconnecting switch and support insulator for it

FIELD: electricity.

SUBSTANCE: disconnecting switch for interruption of current circuit under voltage which is at least 100 kV relative to the ground includes two groups (14, 15) of elongated bar-shaped support insulators (16) provided with possibility of being installed on the ground and supporting each of ends (19, 20) of wire at high altitude above the ground. Blade (21) of disconnecting switch is connected to one or both of the above wire ends and has the possibility of being moved for connection and disconnection of those ends. Support insulator is made from insulating water-proof composite material on the basis of rubber, containing rubber introduced to fire-resistant filler which is resistant to corona discharge. Disconnecting switch and support insulator can be used in converter station of transfer system of high voltage on direct current.

EFFECT: decreasing the height of support insulators and due to this the height of disconnecting switch.

19 cl, 2 dwg

 

The scope and level of technology

The present invention relates to a switch for receiving the physical tearing circuit under high voltage of at least 100 kV with respect to earth, and mentioned the switch contains two groups of elongated sterzhnevykh supporting insulators made with the possibility of installation on the ground and support the end of the conductor, part of the mentioned circuit, each at a high altitude above the earth, in which at least the first of these groups support insulators serves as a support for the knife switch, one end of which is connected to one of the mentioned ends of the conductor and configured to move from the closed position of the disconnector in which the other free end of the said knife connected with the other end of the conductor, for separation of the mentioned ends of the conductor from each other and, in addition, relates to a supporting insulator for such a switch.

Note that the term "insulating" in this description means "electrically insulating", although it is not mentioned explicitly.

The mentioned high voltage can be either AC voltage and DC voltage, although this invention is particularly directed to the case of constant voltage, as is especially true about the LEM, increasing the level mentioned high voltage. For lighting, but in no way limiting of the invention will be further considered the case for a switch that is installed together with the Converter station transmission system HVDC (high voltage direct current).

When transferring a constant voltage of DC voltage connected to this Converter station, it is desirable to have the voltage as much as possible magnitude as the voltage is increased to decrease the transmission loss. Thus, there is a constant desire to increase the voltage at the poles of the transmission line such transmission system relative to the earth. It also means that the height mentioned circuit above the ground should be increased. Disconnectors of this type are usually installed in switchgear, outside cabinets with Converter valves to disconnect the equipment for maintenance or failure, to detach the pole mentioned transmission line when the short circuit occurs on the ground, etc.

This means that when the aforementioned high voltage to a high level, namely about 600 kV and above, problems can occur. To get a good spark overlap in the above-mentioned supporting insulators for such a p is syenites, they need to use the height of the projections above the installed equipment switchgear and also make them sensitive to mechanical stresses associated with a very large height of the support insulators, and seismic phenomena. Usually referred to the supporting insulators made of porcelain and supply external radial flanges, skirts that are located essentially uniformly in the longitudinal direction of the insulator. The sizes of these flanges is chosen on the basis of a certain sliding distance considering the fact that in the usual case, the switch is exposed to weather conditions such as rain, which can increase the above-mentioned distance of crowding. In addition, each of such high support insulators shall be made of several coaxial delivered parts of the support insulator, interconnected by a metal flange attached to the insulator, which further increases the height of this pedestal insulator.

The invention

The present invention is the provision of a disconnector and a support insulator for him, of the type defined in the introductory part, which allows to reduce the height of such support insulators and due to this, the height of the disconnector.

This task according to the present invention is solved what obespechenie so disconnector, in which at least the outer part of the mentioned supporting insulators made of an insulating hydrophobic composite material based on rubber.

When using such an insulating hydrophobic composite material based on rubber for the mentioned support insulator length of crowding of the support insulator can be reduced due to the hydrophobic characteristic that greatly reduces the risk of any incident flow on the surface of the insulator in high humidity conditions, such as rain and fog. This means that the supporting insulators of the disconnector may be able to perceive more kV/mm without increasing the risk of a spark overlap and other problems. Another advantage of such a hydrophobic insulating composite material based on rubber, compared with the use of porcelain for base insulators is that the production technology is such that the said radial flanges or skirts, if they exist, can be made thinner, that at a certain free space between adjacent similar flanges leads to the presence of a larger number of these flanges per unit length, as well as reducing the height of such a support insulator for a given voltage. Production technologies also allow the decision is ü supporting insulators, manufactured from this material, of greater length than the supporting insulators made of porcelain, which reduces the number mentioned metal flanges connecting the two stacked on each part of the support insulators, and also to reduce the height of the support insulator, as each such flange adds height. So, as a result of this new approach consisting in the use of hydrophobic insulating composite material based on rubber for base insulators in the disconnectors for such high voltages, there are a number of advantages. Such or similar insulating composite materials were used for enclosing various equipment, such as circuit breakers, voltage dividers, etc.

According to one variant embodiment of the present invention mentioned insulating material includes rubber embedded in the refractory filler. Fire-retardant property of the filler is important when working with high voltages.

According to the following variant of the embodiment of the present invention, the rubber is embedded in the filler, which is resistant to corona discharge, which reduces the risk of breakdown of an insulating material, for example, in the air gap between adjacent radial flanges of the support insulator.

According to the second variant embodiment of the present invention mentioned insulating hydrophobic composite material based on rubber contains rubber, selected from compounds of rubber with silicon. Discovered that such insulating composite materials based on rubber with silicon have the claimed properties.

According to the following variant of the embodiment of the present invention mentioned rubber embedded in the filler of the three-hydrate of aluminum, which is a suitable filler for forming an insulating hydrophobic composite material based on rubber corresponding to the present invention.

According to the following variant of the embodiment of the present invention mentioned base isolators essentially completely made of the above-mentioned hydrophobic insulating composite material based on rubber. Starinavity the reference insulator may be manufactured using any known method of manufacturing such a material as a single product, which includes the aforementioned radial flanges and possibly modified end portion for connection with other parts.

According to the following variant of the embodiment of the present invention each of the said supporting insulators has many external radial flanges or skirts, distributed essentially uniformly in the longitudinal direction of the insulator. Such radial flanges or skirts can through the use of this material can be made smaller is her thickness, than in the case of manufacture of porcelain, which allows you to place more of the above-mentioned skirts per unit length at a given air gap between successive skirts.

According to the following variant of the embodiment of the present invention mentioned group of support insulators, serving as a support said knife switch has a movable supporting insulator made with the possibility of moving to move the above-mentioned knife with the purpose of separation and connection of the two ends of the conductor, and the movable supporting insulator made of the same material as other supporting facilities. This means that the height may be reduced accordingly and this rolling of the support insulator, which, of course, is of great importance to preserve the height of the isolator at an acceptable level.

According to the following variant of the embodiment of the present invention the switch includes a rack of steel or similar material, whereby the above-mentioned group of support insulators installed on the ground. Thus, the switch is set to land directly on said supporting insulators, and on the ground can be set hour, the stabilizing structure and the pillar mentioned supporting insulators.

According to the next version translated the texts of the present invention each of the said supporting insulators made, at least two stacked on other parts of the insulators, the United stabilizing the supporting frame for coaxial installation. Stabilizing support frame may be formed of metal flanges. This can be useful when the disconnector is designed for very high voltages, for example above 600 kV, and the height of the support insulators will be significant, for example of the order of 10 meters, and that, at least, will not create difficulties when dealing with such a long support insulator during transport if he will be manufactured as a single product.

According to the following variant of the embodiment of the present invention, each of the mentioned sections of the support insulator longer than 2.5 m, preferably greater than 3 meters, mostly longer than 4 metres or longer than 5 meters. So long mentioned section of the base insulators can be achieved by the production technologies and high mechanical resistive property of the material used for the above-mentioned supporting insulators to reduce the number of connecting a stabilizing reference frames, for example, in the form of metal flanges and due to this, the height of the support insulator.

According to the following variant of the embodiment of the present invention mentioned disconnector made with prob is the possibility of obtaining a physical gap circuit, under voltage above 200 kV up to 400 kV, above 600 kV, 700-1000 kV or 800 kV with respect to earth. As already mentioned, the above mentioned voltage, the greater the interest in the use of the support insulator of an insulating hydrophobic composite material based on rubber corresponding to the present invention, not limiting for this purpose, the present invention only such very high voltages.

According to the following variant of the embodiment of the present invention disconnector is arranged to receive physical rupture of the circuit, in the normal case, the conduction current is above 500 And, for example, 1 kA 5 kA. It is the levels of currents normally encountered in current circuits with the need to break disconnector, which is dominated by the aforementioned high voltage.

This invention also relates to a supporting insulator for disconnector, to obtain a physical rupture of the circuit under high voltage relative to the earth, comprising at least 100 kV, the newly added items, and benefits and different ways of realization of such a support insulator according to the invention is apparent from the above description of the switch corresponding to the present invention.

This invention also relates to the use of R is of syenites, relevant to the present invention, or the support insulator corresponding to the present invention, together with the Converter substation transmission system HVDC, where the disconnector according to the present invention and the reference insulator is particularly advantageous.

Further advantages and advantageous features of the invention will become apparent from the following description.

Brief description of drawings

Next, with reference to the attached drawings follows a specific description of a variant embodiment of the present invention, considered as an example.

From drawings

1 very schematically illustrates the overall structure of the Converter stations in the HVDC transmission system, in which respectively applied to the switch corresponding to the present invention.

2 is a simplified vertical side view of the switch corresponding to one of the variants of the embodiment of the present invention.

Figure 3 is a simplified view of the cross-section plane III-III of one of the groups supporting insulators switch corresponding to figure 2.

The detailed description of embodiments of the invention

Total project Converter HVDC station in the transmission system shown in figure 1. In the preferred case, the switch corresponding to the present invention, installed together with the nd Converter station. This Converter station 1 is installed on one end of the line 2 of the HVDC transmission having two poles, one pole 3 with a positive polarity and one pole 4 with a negative polarity. System 5 AC Converter connected to the station through the transformer 6 to obtain the appropriate level of voltage in said AC system. System AC can be a generation system in the power plant any type of electric generator or consumer system or network, connecting with consumers, such as industrial plants or locations. The transforming substation has two converters 7, 8, in which the direct current side is connected, firstly, with the matching of these two poles 3, 4 and, secondly, with the contour 9 of the neutral DC, which is common to the converters and connecting the low voltage side to ground to set a specific voltage in each of the converters. This voltage is in the normal case can be of the order of 400 kV - 800 kV, and the trend is increasing this voltage, to the extent possible, to reduce transmission losses, in line 2, as described above. This Converter station has several dividers, done is the R with the possibility of connection and disconnection converters, harmonic filters (not shown)corresponding to the pole transmission lines, etc. as the example shows only some of these disconnectors 10-13, at the same time, other equipment, well known to experts in the art, are excluded from consideration for simplification of the drawing.

Next, with reference to figure 2 and 3 will be considered one of the variants of embodiment of such a switch. So, this switch is designed to produce physical rupture of the circuit under high voltage relative to the ground, and the switch shown in figure 2 and 3, is designed to break the circuit, under voltage 800 kV, in which current can flow 4 kA.

The disconnector has two groups 14, 15 with one or more elongated sterzhnevykh support insulators 16, is made with possibility of installation on the ground 17 by the installation of a roll stand of steel and support each of the ends 19, 20 of the conductor (bus)included in the aforementioned circuit, at high altitude above the ground. The guide consists of three cables, parallel connected. In the present case, the level is approximately 13 meters. The first 14 of these groups support insulators serves as a support for the knife 21 of the disconnector, which is provided with a Central hinge 22 and may POWERCIAT the Xia, moving between a position in which it closes the mentioned circuit (dotted line), and the position in which it closes the mentioned circuit (solid lines). At the front 18 of the band 14 of the base insulators installed the motor 23, which is designed to manage such operations of connection and disconnection by actuation of the rolling support insulator 24, which has the same form as the two supporting insulator 16 of the band 14. Group 15 of the support insulators in this example consists of three supporting insulators.

Each of the supporting insulators is divided into three sections 31-33 of the support insulator, each of which has a length of 3.3 meters and which are interconnected by metal flanges and stabilizing the supporting frame 34. Each of the metal flange has a height of about 200 mm

For a larger view "A" shows that the supporting insulators have many radial flange or skirt 35, uniformly distributed in the longitudinal direction of the insulator to reduce the risk of incident flow. Voltage relative to the ground will be distributed air gaps formed between successive similar radial skirts 35.

The supporting insulators made of an insulating hydrophobic composite material based on rubber with silicium received PU is eating the introduction of rubber with silicium in the filler of the three-hydrate of aluminum, which is fireproof, and resistant to corona discharge. Due to the hydrophobic characteristic of this material the risk of rolling threads in conditions of high humidity, such as rain, will be significantly reduced compared with the use of porcelain as an insulating material, thus it will be possible to reduce the distance of crowding or leakage pathway, and by this reference insulator will be able to perceive more kV/mm in its longitudinal direction. This means that you can reduce the height of such a support insulator. The ability to produce radial flanges 35 smaller thickness allows to reduce the height of the support insulator for an additional 10%-25%, bringing its height can in the present case, approximately 10 metres plus the height of the stand 2.5 meters instead of approximately 15 metres plus hour that it would be difficult, especially in a region with high seismic activity.

In addition, well-known porcelain post insulators shall be manufactured parts with a length of approximately 2 meters, with the desired metal flange spaced every 2 meters, which increases their height, whereas in the present case mentioned insulating hydrophobic composite material based on rubber ensures a sufficient mechanical stability for su is the natural enemy of the longer sections of the support insulator, for example 5 meters or more, if necessary.

The invention is naturally in no way limited to the above-described variant of its implementation, and the specialist in the art will be apparent many possible modifications that do not contradict the basic idea of this invention, mounted in paragraphs appended claims.

A number of support insulators in each of these groups in the disconnector may differ from those shown in the drawings. The design of the knife switch and method of controlling its movement are not the subject of the present invention and can be implemented in many other ways, different from the one considered.

As already noted, the switch corresponding to the present invention can also be used for separation circuits of AC voltage, although the invention is particularly advantageous to use when working with constant voltage, where there are higher levels of this tension.

Note that both groups support insulators can serve as a support for the knife switch, then two knife switch can be closed to connect the contact element located between the ends of the conductor. In paragraphs appended claims, the phrase "other free to the EC mentioned knife connected with the other end of the conductor" should be understood as also covering similar case of indirect connection.

1. The disconnector to obtain a physical rupture of the circuit under high voltage of at least 100 kV with respect to earth, and mentioned the switch contains two groups (14, 15) elongated sterzhnevykh support insulators (16), made with the possibility of installation on the ground and support the end (19, 20) of the conductor, part of the mentioned circuit, each at a high level above the ground, in which at least the first (14) of the mentioned groups supporting insulators serves as a support for the knife (21) switch, one end of which is connected to one of these ends of the conductor and configured to move from the closed switch position, in which the other free end of the said knife connected with the other end of the conductor, for separation of the mentioned ends of the conductor from each other, characterized in that at least the outer part of the mentioned support insulators (16) made of an insulating hydrophobic composite material based on rubber, which contains a rubber embedded in the refractory filler.

2. The disconnector according to claim 1, characterized in that the filler is also resistant to corona discharge.

3. The disconnector according to claim 2, characterized in that the said filler is aluminum trihydrate.

4. Switch on any of the previous points, characterized in that the said hydrophobic insulating composite material based on rubber contains a rubber selected from compounds with silicon rubber.

5. The disconnector according to any one of claims 1 to 3, characterized in that the said base isolators (16)essentially completely made of the above-mentioned hydrophobic insulating composite material based on rubber.

6. The disconnector according to any one of claims 1 to 3, characterized in that each of the said supporting insulators (16) has many external radial flange or skirt (35), distributed essentially uniformly in the longitudinal direction of the insulator.

7. The disconnector according to any one of claims 1 to 3, characterized in that the mentioned group (14) of the base insulators serving as a support mentioned the knife (21) switch has a movable reference insulator (24)made with the possibility of moving to move the above-mentioned knife disconnection and connection of these two ends (19, 20) of the conductor, and that this movable support insulator (24) made of the same material as other base isolators (16).

8. The disconnector according to any one of claims 1 to 3, characterized in that it contains a rack (18) made of steel or similar material, whereby the above-mentioned groups (14, 15) supporting insulators made with the possibility of installation on the ground.

9. Rashedin the tel according to any one of claims 1 to 3, characterized in that each of the mentioned reference insulator (16) is made of at least two stacked on each other (31-33) support insulators, connected by a stabilizing support frame (34), for their coaxiality.

10. The disconnector according to claim 9, characterized in that each of the mentioned part (31-33) support insulator longer than 2.5 m, preferably greater than 3 m, mostly longer than 4 m or longer than 5 meters

11. The disconnector according to any one of claims 1 to 3, characterized in that it is made with the possibility of obtaining physical rupture of the circuit, under voltage above 200 kV up to 400 kV, above 600 kV, 700-1000 kV or 800 kV with respect to earth.

12. The disconnector according to any one of claims 1 to 3, characterized in that it is made with the possibility of obtaining physical rupture of the circuit, normally conducting current above 500 And, for example 1-5 kA.

13. The reference insulator to switch to obtain the physical rupture of the circuit under high voltage of at least 100 kV with respect to earth, characterized in that it is made of an insulating hydrophobic composite material based on rubber-containing rubber is embedded in the refractory filler.

14. The reference insulator according to item 13, characterized in that the filler is also resistant to corona discharge.

15. The reference and orator on 14 characterized in that the filler is aluminum trihydrate.

16. The reference insulator according to any one of p-15, characterized in that the said hydrophobic insulating composite material based on rubber contains a rubber selected from compounds with silicon rubber.

17. The use of the disconnector according to any one of claims 1 to 12, together with the Converter station transmission system HVDC (high voltage direct current).

18. The application 17 in which the said switch is configured to disconnect and connect converters, and/or harmonic filters, and/or pole transmission line used in conjunction with the mentioned Converter station.

19. Application support insulator according to any one of p-16 together with the Converter station transmission system HVDC (high voltage direct current).



 

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