JPS59188308A - Gas insulating cubicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Description of the Technical Field] The present invention provides an SF6 gas insulated cubicle (1) consisting of a plurality of electrical devices housed in a metal container (2), which facilitates maintenance and inspection thereof. Gas chamber separation structure (knee).

[Technical background of the invention and its problems]

Recently, 66/7 has been installed in power receiving and transforming equipment for electric power and general industry.
In order to meet the needs for space factor and cost reduction, there is a trend toward using SF6'JF insulated cubicles with excellent IW insulation properties for 7 kV FDC cubicles.

The dielectric strength of SFa gas is extreme even at low pressures such as atmospheric pressure + 2 bar (g); h, and without electric field concentration, the dielectric strength of SFa gas is about three times that of air, causing dust and a significant reduction in the cubicle. It becomes possible to

For this reason, the unit is assembled, tested, and installed on-site within a factory with good work management conditions, so it has the advantage of maintaining its original high reliability.

A typical gas insulated cubicle is constructed of a busbar 2, a disconnector 3, a breaker 4, a busbar 2, a disconnector 3, a breaker 4, and a transformer connected to a cable head 1 which is connected from the primary side of a C2 transformer, as shown in the single-wire circuit in Figure 1.
It is led out to the bus 6 via the 1+tu device 5. In addition, many other items such as grounding devices 7 instrument transformers 8 and lightning arresters 9
Seeds are stored in two cap-like containers 10 (as shown in Figure 2), separated into separate rooms by a partition plate 11 (2), or are stored all at once without a partition plate.

Conventional gas-insulated cubicles with the above configuration (= compared to the conventional gas-insulated cubicles, which have superior environmental resistance and require much more maintenance and inspection (2) Although there are If signs that can save labor, it is necessary to open and close circuit breakers, disconnectors, etc. C': Since it is necessary to check the contact wear and retighten the operating mechanism, it was not possible to make it maintenance-free.

For this reason, when maintenance inspections are carried out on-site, all the SF and gas inside the gas insulated cubicle are recovered, so the power supply must be stopped abruptly, and the -carrying atmosphere (two exposed Therefore, it is necessary to take measures to prevent moisture absorption, dust, etc. from entering the site (2. In this case, if there is a dihydrogen compound in the gas,
SOFg and HF This decomposed gas is toxic and has a bad odor, and has many problems such as not only having negative effects on the human body, but also corroding metals and reducing the creepage insulation of organic insulators. .

[Purpose of the invention]

The present invention was made in view of the above circumstances, and it solves all of the problems mentioned above.It facilitates on-site maintenance and inspection, and improves reliability, safety and health. The purpose is to provide cubicles.

[Summary of the invention]

The present invention focuses on the functions of equipment stored in gas-insulated cubicles, and the necessity of inspection and maintenance. Operations such as SFa gas recovery and injection are easy (we used a main circuit disconnection section for the conductor between each chamber (one that can create a new path within the two vacuum valves), rather than a simple one that can be done twice.
SF eliminates arc interruption in gas and allows safe maintenance work.

A gas insulated cubicle can be realized.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained with reference to FIG. 1
6 houses stationary equipment that does not require constant inspection, such as instrument transformers, current transformers, and lightning arresters.
It houses switchgear such as circuit breakers, disconnectors, and grounding devices. Third, insulation is not required, but
As described above, the closed switchboard is constructed into three rooms (separated into two). Each room is separated by a partition plate 11. However, it is necessary to connect the first inspection chamber 16 and the first inspection chamber 16 as a conductive part of the main circuit, and this structure is
A new path device 12 is installed that penetrates the.

This disconnector 12 is used not only for electrical disconnection (2) but also for gas separation, for example, by using a vacuum
Set it to 2.

The details are shown in Figure 4 (2).The attachment part of this vacuum nokurubu is provided with a flange 13 made of insulating material such as resin mold, and is attached using 12 partition plates 11 (2) gas sealing material 22. This main circuit is connected to the second inspection chamber 17.
1j (= terminal 4a of a certain circuit breaker 4, main circuit disconnection section 15 for inspection, connecting metal plate,
Disconnection section 2a of new circuit device 12 on inspection room 16 side, terminal 1
2b (two connections are made). Furthermore, there is a branch terminal 21 on the way, and it is arranged so as to be connected to the ground terminal section 14.

Next (2) The effects of the present invention will be described.

With the above-mentioned configuration, when inspecting the breaker 4, grounding device 7, etc. (-, the work is performed after turning off the disconnector 12; In addition, because the SF gas was disconnected in the vacuum pulp where gas does not enter, only the second inspection room (
Nigas recovery is limited. Therefore, the work management at the closed switchboard is extremely difficult (at the site), rather than at the entire closed switchboard.
It becomes easier.

[Effects of Examples]

According to the configuration of the present invention, since a disconnector (a double nitrogen valve is used), there is no arc interruption in SFe gas.
Safety and hygiene can be improved without generating decomposition gas. Furthermore, since there is no arc interruption in the gas, there is no generation of dust due to interruption, so problems such as degradation of creeping insulation and metal corrosion can be solved. It also has many other advantages, such as being economical because the amount of gas recovered is small.

[Other Examples]

In this example, the first and second inspection chambers and the no-gas pressure chamber (1 separate and partitioned structure were constructed), but the no-gas pressure chamber may not be provided and the first and second inspection chambers alone may be configured. Good. In this case, the breaker is installed on the floor (integrated type with two wheels).If used in combination, there is no need for a partition plate, which has an economical effect.

〔Effect of the invention〕

The effect of non-invention (2) is that during inspection (2 power outages are not required, work management on site becomes easier)
Since arc interruption in Fa gas has also been resolved, there is no generation of arc interruption (decomposed gas), and safety and health problems for operation and maintenance workers have also been eliminated.In addition, problems such as metal corrosion and insulation deterioration have been eliminated. It can also be solved simultaneously and provide a highly reliable SF6 gas insulated cubicle.

[Brief explanation of drawings]

FIG. 1 is a single-wire circuit diagram, FIG. 2 is a side sectional view of a conventional S Fa gas insulated cubicle, and FIG. 3 is a side sectional view showing an example of an SF6 gas insulated cubicle according to an embodiment of the present invention.
FIG. 4 is a detailed sectional view of the royal circuit disconnecting section and the connecting device. 1... Cable head 2... Bus bar 3... Disconnector 4... Breaker 5... Current transformer 6...
Pump 7...Grounding device 8...Instrument transformer 9...
・Surge arrester 10...Metal container 11...Partition plate 1
2...Vacuum pulp disconnector 13...Flange
14... Ground terminal section 15... Main circuit disconnection tfls
16...1st inspection room 17...2nd inspection room 18...Gas-free pressure room (7317) agent
Patent Attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 3

Claims (1)

[Claims] SFa lf Shut-off R cubicle (2) A first inspection room that houses equipment that does not require regular inspection and contains SF gas, a second inspection room that houses a circuit breaker and contains SF6 gas, and a second inspection room that contains SF6 gas. A gas insulated cubicle characterized in that a gas-free pressure chamber (two partitions) in which no injection is performed, and a penetrating portion between the first inspection chamber and the second inspection chamber (-a new passage section using vacuum pulp) is provided.