CN202019230U - Three-phase linkage current switching device - Google Patents

Abstract

Current three-phase linkage switching device. Relates to improvements in current switching devices. It can adapt to the current domestic application status, and can greatly reduce the operation intensity, improve operation safety and convenience, and will not cause misoperation. It is used to realize the connection switch between the bypass current and the No. 1 main transformer and the No. 2 main transformer. The switching device includes a rectangular insulated moving plate and a fixed plate; A, B, and C are evenly distributed in the transverse direction of the fixed plate. , N four groups of conductive rows, the spacing between each group of conductive rows is the same, and there are three conductive rows in each group of conductive rows; there are four overlapping rows of A, B, C, and N in the transverse direction of the moving plate. The initial positions of the four overlapping rows on the horizontal direction of the moving plate are respectively consistent with the initial positions of the 0# conductive row on the fixed plate in each group of conductive rows on the fixed plate; and the width of the overlapping rows is L3, L2+ 2×L1>L3>L1. The utility model changes the operations of shorting, withdrawing, putting in and dismantling the shorting in steps into one step, so as to prevent misoperation accidents.

Description

Current three-phase linkage switching device

technical field

The utility model relates to a current switching device for a main transformer differential protection bypass switch in an electric power system, in particular to an improvement on the current switching device.

Background technique

Many current circuits in substations need to be switched during operation, such as the current circuit switching between the main transformer switch and the bypass switch of the main transformer differential protection, and the current circuit switching of the bus differential protection; , it can be switched to the position of "Main Transformer No. 1" or "Main Transformer No. 2", but it is strictly forbidden to open the circuit during the live switching process. These operations are carried out by the watchman, generally through the current switching platen. These pressure plates are generally divided into four phases (ABCN), and the terminals are divided into two or three layers. Connect to ground, and some operations reach 16 sub-steps.

At present, the domestic protection device uses a pressure plate to input and disconnect the switch opening and closing circuit, input and exit the switching value, and switch the current circuit. Figure 4 is the main transformer differential protection bypass switch current switching pressure plate, the terminal 4 in this pressure plate device is divided into three rows, of which the middle row is the bypass current input circuit, the figure shows the short circuit state, that is, neither No. 1 main change does not represent No. 2 main change.

When the bypass switch replaces the No. 1 main transformer switch, the bypass switch current needs to be connected to the No. 1 main transformer differential protection. The switching process is as follows:

1. Disconnect the connecting plate 3 between the upper "AB" phases;

2. Change the "AB" phase connection pressure plate 3 to the position of "No. 1 main transformer";

3. Disconnect the connecting plate 3 between the upper "BC" phases;

4. Change the connection plate 3 of "BC" to the position of "No. 1 main transformer";

5. Disconnect the connecting platen 3 between the upper "CN" phases;

6. Change the "CN" connecting platen 3 to the position of "No. 1 main transformer";

7. Disconnect the connection platen 3 between the upper layer "N ground";

8. Change the "N ground" connection plate 3 to the position of "No. 1 main transformer";

9. Remove the connecting plate 3 between the lower "AB" phases;

10. Remove the connecting plate 3 between the lower "BC" phases;

11. Remove the connecting plate 3 between the lower "CN" phases;

12. Remove the connecting pressure plate 3 between the lower layer "N ground".

These operations are extremely risky. Any error in any step may cause the current loop to open, and the current loop must not be open during operation, because this operation is very cumbersome and complicated, and the on-duty personnel are afraid of this operation. The existence of fear is extremely prone to misuse.

Foreign protection devices generally do not use pressure plates, nor do current switching circuits use pressure plates. The protection (such as SEL series, SLP series) produced by American GE Company uses a switch box similar to a three-phase switch to switch the current circuit, and the protection produced by Swedish ABB Company (such as RAZFE series, REL system) uses a test switch to switch. Pull out the current plug during operation, the original circuit is automatically shorted, and then insert the plug into the other jack, and the new current circuit is connected to the circuit. But at present, the price of foreign protection devices is expensive, and the operating environment requirements are high. If it is directly applied to domestic application sites, it needs to be updated and modified by other equipment, and the workload and cost are huge.

Utility model content

Aiming at the above problems, the utility model provides a current three-phase linkage switching device that can adapt to the current domestic application status, can greatly reduce the operation intensity, improve operation safety and convenience, and will not cause misoperation.

The technical solution of the utility model is: used to realize connection switching between the bypass current and the No. 1 main transformer and the No. 2 main transformer, and the switching device includes a rectangular insulating moving plate and a fixed plate;

In the transverse direction of the fixed plate, there are four groups of conductive rows A, B, C, and N uniformly distributed, and the distance between each group of conductive rows is the same. The rows are arranged in the order of 1# conductive row, 0# conductive row and 2# conductive row. The distance between the 1# conductive row, 0# conductive row and 2# conductive row is the same, and the distance is L1. The width of the 0# conductive row is L2; the 1# conductive row in each conductive row group is respectively connected to the No. 1 main transformer, and the 0# conductive row in each conductive row group is respectively connected to the bypass current , the 2# conductive row in each conductive row group is respectively connected to the No. 2 main transformer;

Four overlapping rows A, B, C, and N are arranged on the transverse direction of the moving plate, and the initial positions of the four overlapping rows on the transverse direction of the moving plate are respectively connected with each group on the fixed plate. The initial positions of the 0# conductive row in the conductive row group in the transverse direction of the fixed plate are the same; and the width of the overlapping row is L3, and the L2+2×L1>L3>L1.

An elastic pressing device is also arranged on the moving plate.

The overlapping joint row on the moving plate of the utility model can realize three different connection modes at different positions. When it is in the middle position, since its width is less than the sum of the width of the 0# conductive bar and the distance between both sides, the short circuit mode is realized. When moving to either side of the two sides, the bypass current can be connected to the main transformer on that side. The utility model changes the original phase-separated operation of the pressing plate into a linked operation, and changes the original step-by-step operation of shorting, withdrawing, putting in, and removing the shorting into one step, which improves the operation quality, prevents unreliable current switching, and reduces Operation steps to prevent misuse accidents.

The utility model can simplify the switching operation of the current pressure plate from multiple steps to one step, reduce the operation steps of the on-duty personnel, reduce the operation burden of the on-duty personnel, reduce the operation difficulty of the on-duty personnel, eliminate the fear of the on-duty personnel on the operation of the current switching pressure plate, and ensure the operation quality , to prevent the occurrence of misuse. The existing switching pressure plate of the substation can be replaced to eliminate hidden dangers in operation. This new type of linkage switching pressure plate can be used in new substations or in the protection, replacement and renovation of original substations to improve the level of safe operation.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the present utility model;

In the figure, 1 is a fixed plate, 2 is a moving plate, 21 is an overlapping row A, 22 is an overlapping row B, 23 is an overlapping row C, and 24 is an overlapping row N;

Fig. 2 is a structural representation of the utility model;

In the figure, 11 is A conductive row group, 12 is B conductive row group, 13 is C conductive row group, 14 is N conductive row group, 110 is A gap, 11.1 is A1# conductive row, 11.2 is A2# conductive row, 11 .n is A0# conductive row, 120 is B gap, 12.1 is B1# conductive row, 12.2 is B2# conductive row, 12.n is B0# conductive row, 130 is C gap, 13.1 is C1# conductive row, 13.2 is C2# conductive row, 13.n is C0# conductive row, 140 is N gap, 14.1 is N1# conductive row, 14.2 is N2# conductive row, 14.n is N0# conductive row;

Fig. 3 is a schematic diagram of the state of the background technology of the utility model

Among the figure, 3 is a connecting plate, and 4 is a binding post.

Detailed ways

As shown in Figure 1-2, the utility model is used to realize connection switching between the bypass current and the No. 1 main transformer and the No. 2 main transformer. The switching device includes a rectangular insulating moving plate 2 and a fixed plate 1 ;

In the transverse direction of the fixed plate 1, there are four sets of conductive rows A, B, C, and N (A conductive row 11, B conductive row 12, C conductive row 13, N conductive row 14), The spacing between each group of conductive rows is the same, and there are three conductive rows in each group of conductive rows. The three conductive rows are set in the order of 1# conductive row, 0# conductive row and 2# conductive row, and the 1# conductive row row, 0# conductive row and 2# conductive row have the same spacing distance, and the spacing distance is L1 (that is, the A gap 110, the B gap 120, the C gap 130 and the N gap 140 in the figure are all L1), and the The width of 0# conductive row is L2 (that is, the width of A0# conductive row 11.n, B0# conductive row 12.n, C0# conductive row 13.n, and N0# conductive row 14.n are all L2); The 1# conductive row in the conductive row group (A1# conductive row 11.1, B1# conductive row 12.1, C1# conductive row 13.1, N1# conductive row 14.1) is respectively connected to the No. 1 main transformer of the generation, and each conductive row group The 0# conductive row in the group is respectively connected to the bypass current, and the 2# conductive row in each conductive row group (A2# conductive row 11.2, B2# conductive row 12.2, C2# conductive row 13.2, N2# conductive row 14.2 ) are respectively connected to the No. 2 main transformer;

In the transverse direction of the moving plate 2, there are four overlapping rows A, B, C, and N (lapping row A21, overlapping row B22, overlapping row C23, and overlapping row N24). The initial positions of the connecting rows on the lateral direction of the moving plate 2 are respectively consistent with the initial positions of the 0# conductive row in each group of conductive row groups on the fixed plate 1 on the lateral direction of the fixed plate; and the overlapping rows (overlapping The connecting row A21, the overlapping row B22, the overlapping row C23, and the overlapping row N24) all have a width of L3, and the said L2+2×L1>L3>L1.

An elastic pressing device is also provided on the moving plate 2 .

During specific manufacture, the device of the present utility model is divided into two parts of fixed assembly and movable assembly.

Four groups of copper sheets are installed on the fixed component (fixed plate 1), which are A, B, C and N phases respectively. There are three pieces of copper in each group, which are respectively (taking the current circuit of main transformer No. phase current". Among them, the "deactivated position" is connected to the A, B, C, N phases and the ground terminal by connecting wires.

The movable component (the upper part in the figure above) is equipped with four copper sheets, which are respectively connected to the A, B, C, and N phase currents of the bypass switch.

The movable component and the fixed component are close to each other, and are pressed by a spring pressure piece to ensure good contact.

Under normal circumstances, the movable component is fixed in the middle position of the movable component, that is, the inactive position, and the bypass current is shorted and grounded through the short wire.

When the No. 1 main transformer is replaced, the movable components move to the left, and the bypass current is connected to the No. 1 main transformer protection in the short-circuit state. When it reaches the fixed position, the short circuit is disconnected.

The utility model device is characterized in that:

Simple structure: The structure of the current linkage switching pressure plate is simple, and the switching process is completed through the movement of the movable components. There is only one movable part, which ensures reliable operation from the simple structure.

Reliable action: The components of the current linkage switching pressure plate are reliably connected, and there are locking devices at each position. The pressing plate cannot be switched without opening the locking device, and it is impossible to malfunction during normal operation. Since the intervals between the three positions on the fixed component are smaller than the width of the copper sheet of the movable component, it is impossible to open the current loop during the switching process.

Flexible switching: the movable components are flexible in movement, and have good contact and good hand feeling. Open the locking device, and the entire switching process can be completed with a light push.

Easy installation: Since the current linkage switching pressure plate is installed at the original position of the switching pressure plate, that is, after the original single-phase switching pressure plate is removed, the current linkage switching pressure plate is placed on the original terminal, so the original current circuit wiring is not changed, and the installation and replacement are convenient and the workload is reduced. Less, no current loop test is required after installation.

Strong versatility: The current linkage switching pressure plate should have strong versatility, suitable for protection of various types and manufacturers. If one position is locked and only two positions are reserved, it can be used as a current input and exit pressure plate.

Beautiful and generous: The current linkage switching pressure plate is a rectangular switching box, which is made of engineering plastics. There are operation signs on the panel, which is beautiful and generous. After installation, it will not affect the closing of the protective screen door.

Claims (2)

1. The current three-phase linkage switching device is used to realize the connection switching between the bypass current and the No. 1 main transformer and the No. 2 main transformer. It is characterized in that the switching device includes a rectangular insulating moving plate and a fixed plate ; In the transverse direction of the fixed plate, there are four groups of conductive rows A, B, C, and N uniformly distributed, and the distance between each group of conductive rows is the same. The rows are arranged in the order of 1# conductive row, 0# conductive row and 2# conductive row. The distance between the 1# conductive row, 0# conductive row and 2# conductive row is the same, and the distance is L1. The width of the 0# conductive row is L2; the 1# conductive row in each conductive row group is respectively connected to the No. 1 main transformer, and the 0# conductive row in each conductive row group is respectively connected to the bypass current , the 2# conductive row in each conductive row group is respectively connected to the No. 2 main transformer; Four overlapping rows A, B, C, and N are arranged on the transverse direction of the moving plate, and the initial positions of the four overlapping rows on the transverse direction of the moving plate are respectively connected with each group on the fixed plate. The initial positions of the 0# conductive row in the conductive row group in the transverse direction of the fixed plate are the same; and the width of the overlapping row is L3, and the L2+2×L1>L3>L1. 2. The current three-phase linkage switching device according to claim 1, characterized in that an elastic pressing device is further provided on the moving plate.

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