KR102818839B1 - GIS Gas Insulated Switchgear - Google Patents

Abstract

The present invention relates to a gas-insulated switchgear. The gas-insulated switchgear comprises: first and second main transformers (1,3); a first busbar (A), a second busbar (B), and a third busbar (C); first and second main bays (5,10) for receiving power from the first and second main transformers (1,3); first to fourth feeder bays (20,22,24,30) for supplying power to a load; And it includes a bypass bay (50) to assist the operation of the first to fourth feeder bays (20, 22, 24, 30), and the first and second main bays (5, 10) include a circuit breaker (VCB; 7) connected to the first transformer (1) and the first and second bus bars (A, B) to energize or disconnect the line; a 3-way switch (EDS; 9) arranged between the circuit breaker (7) and the first and second bus bars (A, B) to energize or ground the line; It includes a current transformer (CT; 11) for measuring the current value of the line, and when a failure occurs in the first main transformer (1), power supplied from the second main transformer (3) is supplied to the second main bay (10), the first to fourth main bays (20, 22, 24, 30), and the bypass bay (50), and when a failure occurs in the second main transformer (3), power supplied from the first main transformer (1) is supplied to the first main bay (5), the first to fourth main bays (20, 22, 24, 30), and the bypass bay (50).

Description

{GIS Gas Insulated Switchgear}

The present invention relates to a gas-insulated switchgear, and more specifically, to a technology for supplying stable power even in the event of a failure of a main transformer by bypassing the main transformer and supplying power from another normal main transformer when a failure occurs in one of a plurality of main transformers.

In general, gas insulated switchgear is classified into gas insulated and solid insulated types depending on the insulating medium.

In particular, gas-insulated switchgear is a type of power equipment system that prevents safety accidents in advance by collectively storing devices installed in the air in a metal tank filled with insulating gas (e.g., _N2 , compressed air, mixed gas, _CO2 , _SF6 , etc.) with excellent insulation strength, and blocking the spread of accidents or failures occurring in transmission lines and transformers.

These gas-insulated switchgear are equipped with a feeder bay, which supplies power by transmitting and receiving power through a bus bar. At this time, the bus bar is based on a double bus bar and is a three-phase unit type or a single-phase separate type.

These feeder bays are connected to a busbar that receives power from the main bay and include a grounding disconnector that energizes or disconnects the line, a disconnector that energizes or disconnects the line, and a three-stage switch that is connected to a power cable for bringing in or taking out electricity and energizes or disconnects the line.

However, the feeder bay or bypass bay equipped in the conventional gas-insulated switchgear has the problem of inefficient use of layout space and increased installation costs.

Patent application No. 10-2009-0000084 (Title: Gas-insulated switchgear)

In order to solve such a problem, the purpose of the present invention is to provide a gas-insulated switchgear capable of supplying stable power even when a main transformer fails by supplying power from another normal main transformer by bypassing the main transformer when a failure occurs in one of a plurality of main transformers.

In addition, another object of the present invention is to provide a gas-insulated switchgear in which space can be saved by arranging an instrument peripheral pressure switch in one direction of a feeder bay or a bypass bay, the volume of the gas-insulated switchgear can be reduced, and the radius of the outer case can be reduced, thereby reducing the overall installation space and reducing the manufacturing cost.

In order to achieve the above purpose, the present invention provides a gas-insulated switch,

These gas-insulated switchgear are:

First and second transformers (1,3);

It consists of a first bus bar (A), a second bus bar (B), and a third bus bar (C), and a first and second main bays (5, 10) for receiving power from the first and second main transformers (1, 3);

The first to fourth feeder bays (20, 22, 24, 30) for supplying power to the subordinates; and

A gas-insulated switchgear including a bypass bay (50) to assist the operation of the first to fourth feeder bays (20, 22, 24, 30),

The first and second main bays (5, 10) include a circuit breaker (VCB; 7) connected to the first main transformer (1) and the first and second bus bars (A, B) to energize or disconnect the line; a 3-way switch (EDS; 9) arranged between the circuit breaker (7) and the first and second bus bars (A, B) to energize or ground the line; and a current transformer (CT; 11) for measuring the current value of the line.

In the event of a failure in the first main transformer (1), power supplied from the second main transformer (3) is supplied to the second main bay (10), the first to fourth main bays (20, 22, 24, 30), and the bypass bay (50).

In the event of a failure in the second main transformer (3), power supplied from the first main transformer (1) is supplied to the first main bay (5), the first to fourth main bays (20, 22, 24, 30), and the bypass bay (50).

By the above-described configuration, the present invention has the effect of enabling a stable power supply even in the event of a failure of a main transformer by supplying power from another normal main transformer by bypassing the main transformer when a failure occurs in one of the plurality of main transformers.

In addition, the present invention can reduce the volume by vertically arranging the switch section, the movable section, and the three-stage switch, which are components of the feeder bay or the bypass bay, and selectively arranging the instrument peripheral pressure regulator in one or the other direction, and can reduce the radius of the outer case, thereby reducing the overall installation space and reducing the manufacturing cost.

Figure 1 is a schematic diagram of a gas-insulated switch according to an embodiment of the present invention.
Figures 2(a) and (b) are cross-sectional views of multiple main bays illustrated in Figure 1.
Figure 3 is a front view showing a structure in which an instrument peripheral pressure device is connected to one side of the feeder bay illustrated in Figure 1.
Figure 4 is a side view of Figure 3.
Figure 5 is a drawing showing the structure of the grounding circuit contact and the three-stage switch illustrated in Figure 3.
Figures 6(a) and (b) are single-line diagrams of the bypass bay shown in Figure 1.

Hereinafter, the gas-insulated switch device according to the present invention will be described in detail with reference to the attached drawings.

As shown in FIGS. 1 to 6, a single-line diagram is shown to explain the connection relationship of the main pressure switch, main bay, feeder bay, and bypass bay of the gas-insulated switchgear according to an embodiment of the present invention.

As illustrated, it is composed of a first bus bar (A), a second bus bar (B), and a third bus bar (C), and the single-line diagram illustrates first and second main transformers (1,3); first and second main bays (5,10) for receiving power from the first and second main transformers (1,3); first to fourth feeder bays (20,22,24,30) for supplying power to a load; and a bypass bay (50) for assisting stable operation of the first to fourth feeder bays (20,22,24,30).

The first bus line (A) and the second bus line (B) are composed of M-phase and T-phase, which are composed of AF line and TF line, respectively.

And, in the first and second main bays (5, 10), the first main bay (5) is connected to the first main transformer (1), and the second main bay (10) is connected to the second main transformer (3).

These first and second main bays (5, 10) receive power from the first and second main transformers (1, 3) and supply it to the first bus bar (A) or the second bus bar (B), and through this, supply power to the load side or other bays, such as the feeder bay (5, 10).

The first and second main bays (5, 10) have the same structure and are described by the first main bay (5).

The first main bay (5) includes a first transformer (1) and a circuit breaker (VCB; 7) connected to the first and second bus bars (A, B) to energize or disconnect the line; a 3-way switch (EDS; 9) arranged between the circuit breaker (7) and the first and second bus bars (A, B) to energize or ground the line; and a current transformer (CT; 11) for measuring the current value of the line.

The first bus bar (A) is placed inside the first tank (T1), the second bus bar (B) is placed inside the second tank (T2), the disconnector (9) is placed inside the third tank (T3), and the circuit breaker (7) is placed inside the fourth tank (T4).

At this time, the 3-way switch (9) in the third tank (T3) selectively connects and disconnects the first bus wire (A) in the first tank (T1) and the second bus wire (B) in the second tank (T2).

And, the circuit breaker (7) inside the 4th tank (T4) is connected to the output line of the 1st main transformer (1) on one side and to the 3-way switch (9) on the other side.

Accordingly, the power received from the first main transformer (1) is supplied to or cut off from the isolator. Since the second main bay (10) has the same structure as the first main bay (5), a detailed description thereof is omitted.

Meanwhile, the first to fourth feeder bays (20, 22, 24, 30) are devices for supplying power received from the first and second bus bars (A, B) to the load side, and are similar to the main bay, but the feeder bays are additionally connected to a third bus bar (C) for bypass as well as the first bus bar (A) and the second bus bar (A), as shown in the single-line diagram.

Accordingly, the feeder bay can operate stably even if a defect occurs in the storage configuration of the circuit breaker (7) or the like in the first to fourth feeder bays (20, 22, 24, 30) during operation through connection with the third bus bar (C). This can be seen through a single-line diagram as follows.

In these first to fourth feeder bays, the first and second feeder bays (20, 22) supplied with power from the first main transformer (1) and the third and fourth feeder bays (24, 30) supplied with power from the second main transformer (3)(3) are included.

And, the first and second feeder bays (20, 22) supply power received from the first main transformer (1) through the first and second bus lines (A, B) to the upper and lower lines, and the third and fourth feeder bays (24, 30) supply power received from the second main transformer (3) through the first and second bus lines (A, B) to the upper and lower lines.

Additionally, the bypass bay (50) is placed between the second feeder bay (22) and the third feeder bay.

If a defect occurs inside the feeder bay while the first feeder bay (20) is supplying power to the neighboring second feeder bay (22), for example, if a defect occurs in the circuit breaker (7), the same power is supplied through the bypass bay (50) that connects the three-stage switches (150) to each other, so that power can be supplied normally.

First, let's look at the first and second feeder bays (20, 22).

As shown in FIGS. 3 to 5, the first and second feeder bays (20, 22) are arranged vertically in parallel at a certain distance from each other, and a space is formed between the first and second feeder bays (20, 22).

These first and second feeder bays (20, 22) are composed of 10 isolated tanks, each of which is filled with an insulating gas, and an insulating spacer is formed between each tank to partition the insulating gas filled between each tank.

And, the first feeder bay (20) is composed of an AF side and a TF side, and the AF side and the TF side have the same structure, so the following description will be made based on the AF side of the first feeder bay (20).

In this first feeder bay (20), the tank arrangement structure will be described as follows: a bus tank (101) in which a bus is received from the upper side; a three-phase switch tank (102) connected to the lower portion of the bus tank (101) and in which a switch unit (110) formed integrally with a disconnector and a ground disconnector is received; a blocking tank (103) located vertically below the three-stage switch tank (102) and in which a movable unit (120) is received; a lower disconnecting tank (104) located vertically below the disconnecting tank (103) and in which a three-phase switch (150) is received and connected to the bypass bay (50); a lower instrument main-pressure lower tank (105) connected to the side of the lower disconnecting tank (104); The instrument main pressure sub-tank (106) is connected to the vertical upper portion of the instrument main pressure lower tank (105) and is combined with the instrument main pressure sub-tank (106) in which the instrument main pressure (160; Potential Transformer; PT) is stored.

In the first feeder bay (20) of these feeder bays,

The three-stage switch (150) in the lower circuit breaker tank (104) is connected to the circuit breaker activator side (120) in the circuit breaker tank (103) through the circuit breaker (130).

The breaker movable side (120) is connected to the grounding short-circuit contact (110) in the third-stage switch tank (102). In addition, the breaker movable side (120) is connected to the three-stage switch (150) in the lower short-circuit tank (104), and power is supplied to this three-stage switch (150) through an input/output power cable (170).

In this first feeder bay (20), the power of the mother line is transmitted to the grounding shunt contact (110) in the three-stage switch tank (102). Then, the shunt movable side (120) of the shunt tank (103) is connected to the grounding shunt contact (110).

The grounding shunt contact (110) connects and disconnects the bus bar in the bus bar tank (101) and the breaker side (120).

At this time, the breaker operating side (120) artificially blocks the load current when abnormal current and abnormal voltage occur.

In the case where electricity is to be supplied through the grounding disconnection contact (110) in the three-stage switch tank (102), as shown in Fig. 5, the grounding disconnection movable member (111) is connected to the disconnection stator (112).

On the other hand, when the grounding breaker movable member (111) is connected to the grounding breaker stator (113), the grounding breaker contact (110) acts as a grounding switch, and is used when maintenance and inspection are required.

And, when the grounding breaker movable member (111) is between the breaker stator (112) and the grounding breaker stator (113), it functions as a breaker.

Additionally, power can be supplied when the lower grounding breaker actuator (151) of the three-stage switch (150) is connected to the breaker stator (152).

And, when the lower grounding breaker operator (151) is connected to the grounding stator (153), the three-stage switch (150) functions as a grounding breaker, and this grounding breaker is used when maintenance and inspection are required.

In this way, each tank of the first feeder bay (20) has a structure in which they are vertically connected from the top, thereby enabling a dense spatial arrangement without any gaps.

Meanwhile, an instrument peripheral pressure lower tank (105) is connected to one side of the lower short-circuit tank (104) of the first Peter Bay (100), and an instrument peripheral pressure tank (106) is arranged on the upper side.

And, an instrument peripheral pressure regulator (PT) is placed inside the instrument peripheral pressure regulator tank (106). This instrument peripheral pressure regulator appropriately reduces the voltage supplied to various instruments.

Although the instrument peripheral pressure lower tank (105) and the instrument peripheral pressure tank (106) have been described as being arranged on one side of the first feeder bay (100), the present invention is not limited thereto and may be arranged on the other side as well.

In this way, each tank on the AF side of the feeder bay (100) has a structure that is vertically connected from the top, and since the instrument peripheral pressure device (160) is integrally connected to the side, a dense space arrangement is possible without a gap space, the volume of the gas insulation switch can be reduced, and the radius of the outer case can be made small, which provides additional advantages of reducing the installation space of the entire system and reducing the manufacturing cost.

Meanwhile, the second feeder bay (22) is also composed of an AF side and a TF side, and the AF side and the TF side have the same structure, so the following description will be given based on the TF side of the second feeder bay (22).

That is, the TF side (200) of the second feeder bay (20, 22) includes: a bus tank (201) in which a bus is received from the upper side; an upper grounding three-stage switch unit (202) connected to the lower portion of the bus tank (201) and in which a switch unit (210) formed integrally with a disconnector and a ground disconnector is received; a blocking unit tank (203) located vertically below the upper grounding three-stage switch unit (202) and in which a movable unit (220) is received; a lower disconnecting unit tank (204) located vertically below the disconnecting unit tank (203) and in which a three-stage switch (250) is received; and a lower instrument main pressure tank (205) connected to the side of the lower disconnecting unit tank (204). The instrument main pressure sub-tank (206) is connected to the vertical upper portion of the instrument main pressure lower tank (205) and is combined with the instrument main pressure sub-tank (206) in which the instrument main pressure (260; Potential Transformer; PT) is stored.

The TF side (200) of these first and second feeder bays (20, 22) has the same structure as the AF side (100), so a detailed description thereof is omitted.

The third and fourth feeder bays (24, 30) have the same structure as the first and second feeder bays (20, 22), so a detailed description thereof is omitted.

Although the above has been described as a feeder bay having a two-phase single bus line, the present invention is not limited thereto, and various configurations having n phases such as a three-phase double bus line, a four-phase double bus line, a three-phase single bus line, and a four-phase single bus line may be possible.

As with the feeder bays (20, 22, 24, 30) described above, the bypass bay (50) having three busbars is also composed of isolated tanks, each tank being filled with insulating gas, and an insulator being formed between each tank to partition the gas filled between each tank.

As shown in Fig. 6, the tank arrangement structure of the bypass bay (50) having three bus lines is also similar to the feeder bay (200) described above, including a first tank (301) in which the first bus line (A) is received from the upper side, a second tank (302) located at the lower side of the first tank (301) and connected and in which a 3-way switch (310) is received, a fourth tank (304) connected to the right side of the second tank (302) and having the same height position and in which a disconnector (320) is received, a third tank (303) located at the upper side of the fourth tank (304) and connected and in which a second bus line (B) is received, a fifth tank (305) vertically connected to the second tank (302) and located at the lower side and in which a circuit breaker (330) is received and a current transformer is installed, and a fifth tank (305) and A sixth tank (306) connected vertically and positioned at the bottom, an eighth tank (308) connected to the right side of the sixth tank (306) and having the same height, and a seventh tank (307) connected to the upper side of the eighth tank (308) and spaced apart from the fourth tank (304) by a predetermined distance and housing a third bus bar (C) are combined to form a single-phase bypass bay (50) having three bus bars.

Additionally, a power cable connected to a load is provided at the bottom of the sixth tank (306).

This bypass bay (50) has the same tank layout as the feeder bay (200) except that the 3-way switch (9) is excluded from the 6th tank (306) and the disconnector is excluded from the 8th tank (308).

In the above bypass bay (50), the first bus (A) is stored in the first tank (301), and the power of the first bus (A) is transmitted to the 3-way switch (310) in the second tank (302).

In addition, the third tank (303) stores the second bus (B), and the power of the second bus (B) is transmitted to the disconnector (320) in the fourth tank (304).

Here, the 3-way switch (310) in the second tank (302) and the disconnector (320) in the fourth tank (304) are connected through a conductor (371).

Additionally, the circuit breaker (330) of the fifth tank (305) located below the second tank (302) is connected to the 3-way switch (310) of the second tank (302) through a conductor.

At this time, the 3-way switch (310) in the second tank (302) connects and disconnects the first bus (A) in the first tank (301) and the circuit breaker (330) in the fifth tank (305).

That is, when electricity is to be supplied through the 3-way switch (310) in the second tank (302), the movable electrode (311) is connected to the fixed-side contact (312). When the movable electrode (311) is connected to the ground-side contact (313), the 3-way switch (310) functions as a grounding switch, and is used when maintenance and inspection are required.

Additionally, when the movable electrode (313) of the above 3-way switch (310) is between the fixed side contact (312) and the ground side contact (313), it functions as a disconnector.

At this time, a 3-way switch (9) operating means capable of switching the contact of the 3-way switch (310) in the second tank (302) is built into a control box (not shown).

And, the disconnector (320) in the fourth tank (304) connects and disconnects the second bus (B) in the third tank (303) and the circuit breaker (330) in the fifth tank (305). The disconnector (320) supplies power to the second bus (B) depending on whether the internal movable electrode (321) is connected to the fixed-side contact (322).

At this time, a switch operating means capable of switching the state of the short-circuit breaker (320) in the fourth tank (304) is built into a control box (not shown).

The 3-way switch (310) in the second tank (302) and the disconnector (320) in the fourth tank (304) can be selectively used depending on the usage conditions.

And, the circuit breaker (330) in the fifth tank (305) supplies power directly to the third bus (C) in the seventh tank (307) through the conductor (376) in the sixth tank (306), the conductor (372) connecting the sixth tank (306) and the eighth tank (308), and the conductor (378) in the eighth tank (308).

That is, as shown in the drawing, the bypass bay (50) supplies power from the first bus (A) or the second bus (B) to the third bus (C) in the seventh tank (307), so that even if a fault occurs in the blocking means, such as the circuit breaker (330), housed inside the feeder bay (20, 22, 24, 30) while the feeder bay (20, 22, 24, 30) is operating to supply power to the load side, power is supplied to the third bus (C) of the feeder bay (20, 22, 24, 30) through the third bus (C) of the bypass bay (50), thereby ensuring normal operation.

Meanwhile, the main transformer is composed of a first main transformer (1) and a second main transformer (3).

By configuring the first and second main transformers (1,3) in this way, if a failure occurs in one main transformer, power is supplied to the other main transformer.

That is, when a failure occurs in the first main transformer (1), power supplied from the second main transformer (3) is supplied to the second main bay (10), the first to fourth main bays (20, 22, 24, 30), and the bypass bay (50).

Conversely, if a failure occurs in the second main transformer (3), the power supplied from the first main transformer (1) is supplied to the first main bay (5), the first to fourth main bays (20, 22, 24, 30), and the bypass bay (50).

Claims (4)

First and second transformers (1,3);
It consists of a first bus bar (A), a second bus bar (B), and a third bus bar (C), and a first and second main bays (5, 10) for receiving power from the first and second main transformers (1, 3);
The first to fourth feeder bays (20, 22, 24, 30) for supplying power to the subordinates; and
A gas-insulated switchgear including a bypass bay (50) to assist the operation of the first to fourth feeder bays (20, 22, 24, 30),
The first and second main bays (5, 10) include a circuit breaker (VCB; 7) connected to the first main transformer (1) and the first and second bus bars (A, B) to energize or disconnect the line; a 3-way switch (EDS; 9) arranged between the circuit breaker (7) and the first and second bus bars (A, B) to energize or ground the line; and a current transformer (CT; 11) for measuring the current value of the line.
In the event of a failure in the first main transformer (1), power supplied from the second main transformer (3) is supplied to the second main bay (10), the first to fourth main bays (20, 22, 24, 30), and the bypass bay (50).
In the event of a failure in the second main transformer (3), the power supplied from the first main transformer (1) is supplied to the first main bay (5), the first to fourth main bays (20, 22, 24, 30), and the bypass bay (50).
The first to fourth feeder bays (20, 22, 24, 30) include the AF side and the TF side.
A mother ship tank (101) in which the mother ship is received from the upper side;
A three-stage switch unit tank (102) connected to the lower part of the mother tank (101) and housing a switch unit (110) that forms a single unit with a disconnector and a ground disconnector;
A blocking tank (103) located at the vertical lower part of the three-stage switch tank (102) and housing the movable part (120);
A lower disconnect tank (104) located at the vertical lower part of the disconnect tank (103) and housing a three-phase switch (150) and connected to the bypass bay (50);
A lower tank (105) for instrument peripheral pressure connected to the side of the lower short-circuit tank (104); and
It includes an instrument pressure sub-tank (106) located above the instrument pressure sub-tank (105).
A gas-insulated switchgear in which an instrument pressure transformer (160; Potential Transformer; PT) is stored inside the instrument pressure transformer subtank (106). delete In paragraph 1,
A gas-insulated switchgear in which the instrument main pressure lower tank (105) is selectively connected to one side or the other side of the lower short-circuit tank (104), so that the instrument main pressure (160; Potential Transformer; PT) is also selectively arranged in one side or the other side. In paragraph 1,
The bypass bay (50) comprises: a first tank (301) in which a first bus bar (A) is received from the upper side; a second tank (302) located at the lower side of the first tank (301) and connected thereto and in which a 3-way switch (310) is received; a fourth tank (304) connected to the right side of the second tank (302) and having the same height position and in which a disconnector (320) is received; a third tank (303) located at the upper side of the fourth tank (304) and connected thereto and in which a second bus bar (B) is received; a fifth tank (305) vertically connected to the second tank (302) and located at the lower side and in which a circuit breaker (330) is received and a current transformer is installed; a sixth tank (306) vertically connected to the fifth tank (305) and located at the lower side; A gas-insulated switchgear including an 8th tank (308) connected to the right side of the 6th tank (306) and having the same height position; a 7th tank (307) located above the 8th tank (308), spaced apart from the 4th tank (304) by a predetermined distance, and storing a 3rd bus bar (C).

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