JPH04165909A - Gas-insulated switching device - Google Patents

Abstract

PURPOSE:To decrease composing members and to reduce a site area by setting the axes of upper connection ports of two breakers mounted perpendicularly to a main bus to the same height to be arranged on both sides of the bus, and providing a disconnector for disconnecting and connecting a phase shifting transformer between the upper ports. CONSTITUTION:Lower connection ports of breakers 5a, 5b mounted perpendicularly to both sides of main buses 1a, 1b are connected to the main buses 1a, 1b through instrument CTs 4a, 4b, disconnectors 2a, 2b and grounding switches 3a, 3b. The heights of the axes of the upper connection ports are set to the same, the CTs 4a', 4b' and the switches 3a', 3b' are connected, and disconnectors 7a, 7b for disconnecting a phase shifting transformer 9 and a bypass disconnector 2ab are connected through connecting buses 6a, 6b. The transformer 9 is connected to the disconnectors 7a, 7b through a conduit bus 8. Thus, a device for easily disconnecting and connecting the phase shifting transformers is built on a narrow site by the use of less composing members.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an arrangement for connecting a phase shift transformer circuit to a busbar connection line of a double-bus type gas-insulated switchgear. be.

(Prior Art) In general, power systems have a duty to maintain frequency, voltage, etc. at specified values, and to supply reliable, high-quality electricity without power outages.

System control plays an important role in achieving this responsibility. In terms of content, this system control can be classified into two types: active power control, which targets power flow and frequency, and reactive power control, which aims to rationally allocate reactive power and maintain voltage. I can do it. By the way, power transmission networks connect power plants and loads and deliver active and reactive power supplied from the power sources to the loads. In this case, the power flow distribution in the power transmission grid is determined by the active and reactive power of power plants, the power consumption of loads, and the voltages of nodes to which power plants and loads are connected. As a result, power flow distribution may be affected, such as excessive power being concentrated on some transmission lines, and other transmission lines having sufficient power transmission capacity but rarely receiving electricity. Flutters can occur. Therefore, when there is a loop line in the communication system, the power flow of each communication line is determined by the magnitude of impedance. Therefore, in order to control the power flow distribution, a power flow control member such as a phase shift transformer or a series capacitor is separately required.

On the other hand, in substations, particular emphasis is placed on the viewpoints of reduction of installation space, environmental friendliness, rationalization of maintenance and inspection, and safety for switchgear. Therefore, gas insulated switchgear, which is highly evaluated in these respects, is frequently adopted. Furthermore, gas-insulated switchgear is increasingly being used to connect the phase shift transformer and switchgear for system stability as described above.

with such a phase shifting transformer. A conventional example of a gas insulated switchgear will be explained with reference to a single line diagram in FIG. 6 and layout diagrams in FIGS. 7 to 9. Note that FIG. 6 shows a single line diagram of a system in which the phase shift transformer circuit is connected to the main bus. That is, the gas insulated switchgear is provided with a first bus bar 1a, a second bus bar 1b, which are main buses, and a phase shift transformer 9. Among these, the first bus line 1a.

Each of the busbars 1b is equipped with disconnectors 2a, 2b, and a grounding switch 3.
a, 3b and instrument current transformers 4a, 4b, circuit breaker 5
a and 5b are connected. Furthermore, the circuit breaker 5a, 5b is connected to the phase shift transformer 9 via the instrument current transformers 4a, 4b, the earthing switches 3a, '3b, and the disconnectors 7a, 7b that disconnect the phase shift transformer 9. Cable head lla, llb for connection
is installed.

On the other hand, the phase shift transformer 9 also has a cable head 11a.

11b is installed. And electric cable 12a
, 12b connect the cable heads 1], a, and 11b, thereby forming a phase shift transformer circuit.

Moreover, the circuit breakers 5a, 5b and the phase shift transformer disconnector 7a
, 7b, a disconnector 2ab is arranged in parallel. This disconnector 2ab is provided so that when the disconnectors 7a and 7b operate and the phase shift transformer circuit is disconnected, the role of the busbar connection line is not impaired.

Next, we will describe the equipment arrangement based on the single-line diagram in Section 2.

That is, as shown in FIG. 7, the circuit breakers 5a and 5b are both disposed outside the busbar 1b (on the left side in the figure),
Cable heads lla and llb are installed at positions facing circuit breakers 5a and 5b across the first bus line 1a and the second bus line 1b. Furthermore, the disconnector 2ab is arranged parallel to the busbars 1a and lb. Furthermore, as shown in FIGS. 8 and 9, in the circuit breakers 5a and 5b, the main bus side disconnectors 2a and 2b are connected to the lower connection port, while the phase shift transformer side disconnectors are connected to the upper connection port. Disconnectors 7a and 7b are connected.

At this time, since the circuit breaker 5b and the disconnector bus 1b are close to each other, the connection bus that connects the circuit breaker 5b and the disconnector 2b is short, and conversely, the connection bus that connects the circuit breaker 5a and the disconnector 2a is the busbar lb. It is long because it straddles the mountain.

(Problem to be Solved by the Invention) In the prior art, when a phase shift transformer circuit is added to the busbar connection line as described above, separate lines are installed for each line, so space for two lines is required. Become. At the same time, in order to install disconnectors for the busbar communication circuit in parallel when inspecting the phase shift transformer, space for connection between both circuits was required.
This was not desirable in terms of space reduction. Moreover, the number of components such as cable heads and power cables increased, making it uneconomical.

The present invention has been made in consideration of the above points, and its purpose is to improve the layout configuration of a gas insulated switchgear having a phase shifting transformer circuit, thereby reducing the site area and achieving excellent economic efficiency. The object of the present invention is to provide a gas insulated switchgear that has the same characteristics as the gas insulated switchgear.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, in the present invention, two circuit breakers are vertically erected to the main bus bar, and the axes of their upper connection ports are aligned with each other. A disconnector for disconnecting the phase-shifting transformer is placed between the upper connection ports of these circuit breakers via the connection busbar, and a disconnector for disconnecting the phase shift transformer is placed between the upper connection ports of these circuit breakers. The invention is characterized in that the conduit busbar is connected to a phase shifting transformer.

(Function) The function of the present invention having the above configuration is as follows.

In other words, by arranging two circuit breakers whose axes of the two-part connection ports coincide with each other across the main bus bar, the disconnector for disconnecting the phase-shifting transformer circuit is connected to the negative terminal of both circuit breakers. It can be placed in the middle of the connection busbar.

In addition, a simple arrangement configuration is possible in which a conduit busbar branched from this connection busbar is connected to a phase-shifting transformer to form a phase-shifting transformer circuit.

(Embodiment) Hereinafter, an embodiment of the gas insulated switchgear of the present invention will be described with reference to FIGS. 1-3.

As shown in the single line diagram of FIG. 1, the upper bus line 1a.

Bus line] Disconnectors 2a, 2b, earthing switches 3a, 3 from b
b and current transformers 4a, 4b to circuit breakers 5a, 5'
b, and further connected to an instrument current transformer 4a.

4b, the disconnectors 2a, 2b are connected via connection buses 5a, 6b with a branch to the phase-shifting transformer circuit. Further, the two branch portions of the connection buses 6a and 6b are connected to phase shift transformer connection conduit buses 8a and 8b via phase shift transformer disconnection switches 7a and 7b.

Figures 2 and 3 show equipment layout diagrams based on single-line diagrams as shown in Figures 2 and 3.

That is, the first bus line side circuit breaker 5a and the second bus line side circuit breaker 5b are arranged facing each other on the outside of the first bus line 1a and the second bus line 1b. Further, the axes of the two-part connection ports of the circuit breakers 5a and 5b coincide with each other, and the circuit breakers 5a and 5b are located at equal distances from the disconnectors 2a and 2b, respectively, so that they form a symmetrical U-shape. Therefore, the connection to each main bus bar 1a, lb and the circuit breaker 5a.

The connection at the upper connection port after passing through 5b is configured in a straight line. Incidentally, L-shaped devices are used as the phase shift transformer circuit disconnectors 7a and 7b.

The operation of this embodiment having the above-mentioned configuration is as follows.

That is, in the circuit breakers 5a and 5b, the main core wire 1a.

By arranging the connection to 1b and the connection at ``two-part connection 1'' after passing through circuit breakers 5a and 5b in a straight line,
By using the conduit buses 8a and 8b instead of the cable head 11, etc., the phase-shifting transformer circuit disconnecting disconnectors 7a and 7b and the branching to the phase-shifting transformer 9 can be done in the space of one line of the busbar connection line. It becomes possible to respond.

According to the gas insulated switchgear of this embodiment as described above, the phase shift transformer circuit can be incorporated into the busbar communication circuit line, and each device can be efficiently arranged and configured. This eliminates the need for extra line space, making it possible to reduce the installation space. Moreover, since the conduit busbar 8 is used for connection with the phase shift transformer 9, the number of parts such as cable leads 11- is reduced, and economical efficiency is improved. Furthermore,
When inspecting the phase shift transformer 9, the phase shift transformer circuit disconnectors 7a and 7b are operated to ensure maintenance and inspection. At the same time, when the phase shift transformer circuit is disconnected, the disconnector 2ab operates, so that the role of the I/O line communication line is not impaired, and excellent reliability can be achieved.

Note that the present invention is not limited to the following embodiments, but for example, as shown in FIGS. 4 and 5, the phase shift transformer 9 is When installed on a floor, similar effects can be achieved even if linear disconnectors 17a, ], 7b are used instead of the L-shape in the above embodiment.

As described in "Effects of the Invention J and Below", the present invention provides a busbar communication circuit in which two circuit breakers are arranged facing each other in the busbar communication line of a gas-insulated switchgear of a double-single wire type gas-insulated switchgear. In addition to forming
By adopting a simplified arrangement in which the two-part connected m-line is branched out for connection to the phase-shifting transformer and connected to the phase-shifting transformer, the installation footprint can be reduced; By using a conduit busbar to connect with the cable head, cable heads, power cables, and other component parts +a can be reduced, improving economic efficiency by 1. It is possible to provide a gas insulated switchgear with excellent operability and maintainability, which is capable of reliably fulfilling the function of an LJ line communication circuit by operating a disconnector.

[Brief explanation of the drawing]

Fig. 1 is a single line diagram showing an embodiment of the gas insulated switchgear of the present invention, Figs. 2 and 3 are equipment layout diagrams based on the single line diagram of Fig. 1, and Fig. 2 is a plan view. 3 is a side view of A-A shown in FIG. 2, FIGS. 4 and 5 are arrangement diagrams of equipment in other embodiments of the present invention, and FIG. Figure 5 is a side view, Figure 6 is a single line diagram of a conventional gas insulated switchgear, and Figures 7 to 9 are layout diagrams of conventional equipment based on the single line diagram of Figure 6. 7 is a plan view, FIG. 8 is a side view taken along line X-X shown in FIG. 7, and FIG.
It is a side view of YY shown in the figure. 1a... A bus line, 1 b... A bus line, 2a,
2b, 2ab...Disconnector, 3a, 3b...Earthing switch, 5a. 5b... Breaker, 6a, 6b... Connection bus bar, 7a
, 7b, 17a, 17b...Disconnector for disconnecting the phase shift transformer, 8a, 8b...Pipe line busbar for connecting the phase shift transformer, 9.
...Phase shift transformer, 10...GIS room. +H Figure 2 Figure 3 Figure 4ffil Figure 6 Figure 9

Claims (1)

[Claims] In a gas-insulated switchgear in which a phase shift transformer is bypass-connected to a busbar connection line in a double bus system, the gas circuit breaker of the busbar connection line has its operating axis perpendicular to the main busbar. The circuit breakers are arranged so that the axes of the upper connection ports of both circuit breakers are aligned, and a disconnector for disconnecting the phase shift transformer is arranged in the gap between the upper connection ports of the circuit breaker via the connection bus bar. A gas insulated switchgear characterized in that a conduit busbar is branched from the connection busbar and the conduit busbar is connected to a phase shift transformer.