JPS6124886B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite type switchgear that can be favorably applied to, for example, closed type or reduced type power receiving and substation equipment.

In conventional power receiving and transforming equipment, etc., in the case of the air insulation method, circuit breakers and current transformers are installed independently, and they are connected to each other by conductors. Therefore, the distance between devices becomes large, and the space for installing the devices increases. Furthermore, since circuit breakers, disconnectors, and current transformers are installed independently, their transportation costs, installation costs, and adjustment costs are added separately, increasing the overall overhead costs of the entire power receiving and transforming equipment. Furthermore, since each device is connected to a busbar, it takes a lot of time to convert equipment, perform maintenance and inspection, and perform accident recovery work.

In addition, recently, closed type switchgears such as SF ₆ gas insulation have been increasingly used to reduce space, but closed type busbars and equipment are relatively expensive, and transmission voltage is 60KV or higher. Since there are more overhead line systems than cable systems, it is often necessary to use aerial bushing, which reduces the overall space reduction effect. In addition, with a completely sealed switchgear, it becomes difficult to replace equipment, maintain and inspect the equipment, and it takes a lot of time to recover from an accident.

Furthermore, in both air insulation and gas insulation systems, it is necessary to prepare a large number of standard units to accommodate various system configurations, making it difficult to reduce costs through mass production.

An object of the present invention is to provide a compact and economical composite switchgear in which circuit breakers, disconnectors, and current transformers can be selectively installed in accordance with the system configuration.

In order to achieve this object, the present invention provides an airtight container in which three flanges are spaced apart from each other in parallel on the upper surface and filled with an insulating medium, and two of the three flanges are placed in the airtight container. a vacuum circuit breaker housed between the vacuum circuit breaker and the airtight container, and a through-type current transformer disposed at the base of the vacuum circuit breaker. at least two support insulator tubes configured to be able to be installed; and of the support insulator tubes, the support insulator tube is housed in the support insulator tube provided on the central flange portion, and the lower end side is connected to one end of the vacuum circuit breaker. and at least one current transformer disposed at the base of at least one of the support insulator tubes, the support insulators provided at a portion other than the central flange portion of the support insulator tubes. The present invention is characterized in that a through conductor or a disconnector is selectively housed, and a switching circuit including at least one disconnector is formed between the terminals formed in the plurality of support insulators.

Embodiments of the present invention will be described in detail below with reference to the drawings.

There may be various system configurations for a substation, and FIG. 1 shows, as an example, a single line diagram of a common substation with a double busbar configuration. Lead-in disconnectors 2A and 2 from the double busbars 1A and 1B, respectively.
An electrical system is constructed in which the circuit breaker 3 is led to a common circuit breaker 3 via a current transformer 4, and from there to a lead-out bus 5 via a current transformer 4.

FIG. 2 shows an embodiment in which the present invention is applied to the electrical system shown in FIG. 1, and the same components as those shown in FIG. 1 are designated with the same reference numerals. Reference numeral 10 designates a closed container configured to selectively accommodate a circuit breaker or a through conductor, and is provided with three flange portions 11, 12, and 13.
The airtight container 10 has flange portions 21 and 3 at the lower end of the base.
Support insulators 20, 30, 40 having flange portions 1, 41 are disposed such that the flange portions 21, 31, 41 and the flange portions 11, 12, 13 of the closed container 10 are opposed to each other, and both are provided with the flange portions 11, 12, 13 of the closed container 10 facing each other. It is attached to the pedestal 14 via.

Insulating spacers 2 are provided within the support insulators 20 and 30.
Disconnector chamber 23 to 3 divided by 2 to 32
3 is formed and filled with an insulating medium such as dry air or SF ₆ gas, and a lead-in disconnector 2A or 2 is connected thereto.
B is stored. The fixed sides of the disconnectors 2A and 2B are connected to the bus bars 1A and 1B, respectively. The movable contacts of both disconnectors pass through the insulating spacers 22 and 32 in an airtight manner and face a hermetically sealed insulating chamber 15 formed within the hermetically sealed container 10. In addition, both disconnectors 2A and 2B
The movable contact is connected by pins 24 and 34 so as to be separated near the flange, and is connected to the disconnector operating mechanism 2 attached to the lower surface of the closed container 10.
5 and 35 are opened and closed via insulated operating rods 26 and 36.

A through conductor 43 passes through the inner chamber 42 of the support insulator 40, so that both functionally constitute a bushing. One end of the through conductor 43 is connected to the lead-out conductor 5, and the other end faces the sealed insulating chamber 15. A through-type current transformer 4 having a through-hole conductor 43 as a primary conductor is disposed at the base of the support insulator 40.

A sealed insulating chamber 15 formed in the sealed container 10 communicates with the inner chamber 42 of the support insulator tube 40, and is also filled with an insulating medium such as dry air SF ₆ gas, and the flange portions 12 and 13 are connected to each other. A circuit breaker 3 consisting of a vacuum circuit breaker is housed in between. The fixed side of the circuit breaker 3 is attached to the closed container 100 via the insulating stand 16, and the through conductor 43 is removably in contact with the fixed electrode. The movable electrode of the circuit breaker 3 extends to the flange portion 11 and is connected to the insulating spacer 1 attached to the closed container 10.
7, and disconnectors 2A and 2B, respectively.
is in electrical contact with the movable contact of the Further, the movable electrode of the circuit breaker 3 is driven to open and close by a circuit breaker operating mechanism 18 via an insulated operating rod 19.

The unit shown in FIG. 2 is configured corresponding to the system configuration shown in FIG. 1, and various modifications are possible depending on the basic system configuration.

FIG. 3 shows examples of various model units and system configurations that can be constructed using the closed container 10 and support insulators 20 to 40 shown in FIG. 2.

Model unit A has the same unit configuration as shown in FIG. 2, and can be applied as is to the part shown by the broken line in the regular standby circuit breaker (1CB) power reception system, the double bus system in FIG. 1, etc.

Model unit B has a blind lid by removing support insulator tube 20 from model unit A, housing disconnectors 2A and 2B in the remaining support insulator tubes 30 and 40, and current transformers 4A and 4B at the bases of both insulator tubes. As shown in the diagram, it can be applied to loop power reception, bus tie, bus section, regular standby 2 breaker (2CB) power reception system, 11/2 system, etc.

Model unit C removes support insulator 20 from model unit A to form a blind lid, stores disconnector 2 in one 30 of the remaining two support insulators 30 and 40,
The other support insulator 40 does not contain a disconnector, but is provided with a through conductor to form a bushing, and a current transformer 4 is provided at the base of one of the support insulators, for example 40. Applicable to circuit breaker (CB) power receiving system, 1CB withdrawal method, 2CB withdrawal method, etc.

An embodiment of the present invention applied to model unit C is shown in FIG. In FIG. 4, the same components as in FIG. 2 are designated by the same reference numerals. In FIG. 4, the support insulator 30 houses the disconnector 2 and is connected to the bus bar 1, and the support insulator 20, the disconnector 2A, and the disconnector operating mechanism 25 in FIG. 2 are removed.
The flange portion 11 is covered with a blind lid 50, and the removal trace of the operating mechanism 25 is covered with a blind lid 51. The other configurations are substantially the same as those in FIG.

As explained above, according to the present invention, three support insulator tubes can be attached to a closed container capable of housing a circuit breaker via the flange portion, and a disconnector can be housed in each support insulator tube. In addition to configuring the system to accommodate various system configurations, current transformers can be installed, and circuit breakers, disconnectors, and current transformers can be selectively installed as appropriate depending on the system configuration. It is possible to provide a composite type switchgear that can be applied in various ways. Furthermore, the device of the present invention allows various system configurations to be kept in the same size, and therefore, thorough standardization is possible and an economical composite switchgear can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a single line diagram of a double busbar in a general substation, Fig. 2 is a vertical cross-sectional view showing an embodiment of the present invention applied to the system configuration of Fig. 1, and Fig. 3 is a device of the present invention. FIG. 4 is a longitudinal sectional view showing an embodiment of the present invention applied to the model unit C of FIG. 3. 1, 1A, 1B, 5... Bus bar, 2, 2A, 2B
... Disconnector, 3 ... Circuit breaker, 4 ... Through-type current transformer, 10 ... Sealed container, 11 to 13 ... Flange section, 14 ... Frame, 20, 30, 40 ... Support insulator pipe, 21 , 31, 41...flange part.

Claims (1)

[Scope of Claims] 1. A closed container having three flanges spaced apart from each other in parallel on the upper surface and filled with an insulating medium, and a container located between two of the three flanges in the closed container. a vacuum circuit breaker housed in the airtight container; and a vacuum circuit breaker installed on the closed container using at least two flanges located on both sides of the vacuum circuit breaker, so that a through-type current transformer can be disposed at the base. at least two support insulator tubes having a structure of: a disconnector which is housed in the support insulator tube provided on the central flange portion of the support insulator tubes, and whose lower end side is connected to one end of the vacuum circuit breaker; , at least one current transformer disposed at the base of at least one of the support insulator tubes, and a through conductor or a through conductor or A composite switching device characterized in that a disconnector is selectively housed to form a switching circuit including at least one disconnector between terminals formed in the plurality of support insulators.