CN219371845U - An open combination electric appliance - Google Patents

Abstract

The utility model relates to the field of flexible power transmission systems, in particular to an open combined electrical appliance, which includes a fixed bracket, an isolating switch and a starting resistor. Both the isolating switch and the starting resistor are arranged on the fixing bracket. The conductive circuit of the starting resistor is connected in parallel, and the isolating switch is provided with a conductive knife of the isolating switch. The contact is connected with the outlet end of the starting resistor. The utility model connects the conductive circuit of the isolating switch and the conductive circuit of the starting resistor in parallel to form a conductive circuit of a combined electrical appliance; the conductive part of the isolating switch and the conductive part of the starting resistor share an insulating platform; according to system requirements, grounding can be installed at the inlet and outlet terminals of the combined electrical appliance switch to realize on-site safety inspection and maintenance of products.

Description

An open combined electric appliance

technical field

The utility model relates to the field of flexible power transmission systems, in particular to an open combined electrical appliance.

Background technique

In the flexible DC transmission system, when the flexible DC converter station is connected to the grid system and ready to start, it needs to charge the converter valve unit module to the working voltage. Due to the large capacitance of the converter unit, when the AC circuit breaker is closed, it is equivalent to the process of charging a capacitive circuit. At this time, a large charging current and surge voltage will be generated in the system, which may cause system equipment The damage of the grid even produces a large disturbance to the power grid system. In order to limit the inrush current generated when the system is put into operation, it is necessary to set up a starting resistance circuit in the soft DC converter station. When the system starts, the charging current is suppressed through the starting resistor; after the starting process is completed, the starting resistor is withdrawn to reduce loss.

The current starting circuit adopts a parallel connection of an open independent circuit breaker circuit and another open independent circuit breaker plus starting resistor series circuit or a parallel connection of an open independent isolating switch circuit and another open independent starting resistor circuit, each The equipment is arranged separately, which has the disadvantages of high cost, large floor space, and low equipment integration.

Utility model content

Aiming at the problem of low equipment integration in the prior art, the utility model provides an open combined electrical appliance, which is used to control the input and withdrawal of the starting resistor.

The utility model is realized through the following technical solutions:

An open combined electrical appliance, comprising a fixed bracket, a disconnector switch and a starting resistor, the disconnector switch and the startup resistor are both arranged on the fixed bracket, the conductive circuit of the disconnector is connected in parallel with the conductive circuit of the startup resistor, the disconnector There is a conductive switch knife of the isolation switch connected to the incoming line end of the starting resistor, and a static contact is provided on the starting resistor, and the static contact is connected to the outgoing line end of the starting resistor; When switching off, the conductive knife of the disconnector contacts with the static contact.

Preferably, the fixed bracket includes a steel bracket, a bottom frame, a connecting bracket, a first post insulator and a second post insulator, the bottom frame is connected to the steel bracket, and the first post insulator and the second post insulator are installed on the bottom on the frame; the connecting bracket is arranged between the first post insulator and the second insulator; both the isolating switch and the starting resistor are connected to the connecting bracket.

Preferably, both the conductive blade of the isolating switch and the starting resistor are installed on the connecting bracket.

Preferably, the underframe is arranged on one side of the steel support.

Preferably, the isolating switch is further provided with an isolating switch vertical connecting rod and an isolating switch operating mechanism, and the isolating switch vertical connecting rod is installed on the isolating switch operating mechanism.

Preferably, an operating insulator is also included, one end of the operating insulator is connected to the chassis, and the other end is connected to the bottom of the conductive switch blade of the isolating switch, and the vertical connecting rod of the isolating switch is arranged between the operating mechanism of the isolating switch and the operating insulator .

Preferably, a connecting conductor is provided between the conductive blade of the isolating switch and the starting resistor, and the connecting conductor is located at one end of the conductive blade of the isolating switch and the starting resistor close to the connecting bracket.

Preferably, it also includes a grounding switch arranged on the chassis, and the grounding switch is connected to the starting resistor.

Preferably, the grounding switch is provided with a grounding switch vertical connecting rod and a grounding switch operating mechanism, one end of the grounding switch vertical connecting rod is connected to the chassis, and the other end is connected to the bottom of the isolating switch conductive knife; The vertical connecting rod of the earthing switch is installed on the operating mechanism of the earthing switch.

Preferably, a static contact mounting bracket is connected between the static contact and the starting resistor.

Compared with the prior art, the utility model has the following beneficial effects:

The invention is an open combined electrical appliance, which is used for inputting and withdrawing the starting resistor, and is composed of an isolating switch and a starting resistor. The conductive circuit of the isolating switch and the conductive circuit of the starting resistor are connected in parallel to form a conductive circuit of the combined electrical appliance; through the opening and closing of the isolating switch, the input and withdrawal of the starting resistor are realized.

The utility model is an open combined electrical appliance which connects the conducting circuit of the isolating switch and the conducting circuit of the starting resistor in parallel to form a conducting circuit of the combined electrical appliance; the conducting part of the isolating switch and the conducting part of the starting resistor share an insulating platform, that is, the first pillar insulator and the second pillar insulator. Post insulators.

The conductive blade and the static contact part of the isolating switch are respectively connected with the inlet and outlet terminals of the starting resistor to form a common inlet and outlet terminal; according to system requirements, a grounding switch can be installed at the inlet and outlet terminals of the combined electrical appliance to realize on-site safety inspection and maintenance of the product .

When the system circuit is put into operation, the isolating switch is in the opening state, the system current passes through the starting resistor circuit, and the resistor is put into operation, which is used to control the starting current when the system is put into operation; after the system is put into operation smoothly, the isolating switch is closed. , the current passes through the isolating switch, bypassing the resistor, so that the starting resistor is out of operation.

In the starting resistor circuit connected to the valve side of the transformer, the bypass switch adopts an isolating switch, and the starting resistor is directly connected in parallel with the isolating switch. The starting resistor only works when the system starts. After the startup, the isolating switch needs to be closed to bypass the starting resistor. , to complete the system startup. At the same time, in order to further reduce the occupied area of the equipment and simplify the layout structure of the starting circuit, the isolating switch and the resistor are formed into an open combination electrical appliance, and the structural layout of the starting circuit is innovated.

Further, the grounding switch is to facilitate on-site safety inspection and maintenance of the product.

Description of drawings

Fig. 1 is the front view of embodiment 1 when the isolating switch is closed and the grounding switch is opened;

Fig. 2 is a side view of embodiment 1 when the isolating switch is closed and the grounding switch is opened;

Fig. 3 is the front view of the opening of the isolating switch and the opening of the grounding switch in Embodiment 1;

Fig. 4 is a side view of the opening of the isolating switch and the opening of the grounding switch in Embodiment 1;

Fig. 5 is a front view of the opening of the disconnecting switch and the closing of the grounding switch in Embodiment 1;

Fig. 6 is a side view of the isolating switch opening and the grounding switch closing in Embodiment 1;

Fig. 7 is a top view of the opening of the isolating switch and the opening of the grounding switch in Embodiment 1;

Fig. 8 is a front view of the opening of the isolating switch and the opening of the grounding switch in Embodiment 2;

Fig. 9 is a top view of the opening of the disconnecting switch and the opening of the grounding switch in Embodiment 2;

Fig. 10 is a front view of the isolating switch closing and the grounding switch opening in embodiment 2;

Fig. 11 is a top view of the isolating switch closing and the grounding switch opening in Embodiment 2.

In the figure, 1. Static contact; 2. Conductive knife of isolating switch; 3. Grounding switch; 4. First pillar insulator; 5. Operating mechanism of grounding switch; 6. Steel bracket; 7. Underframe; 8. Second Two post insulators; 9. Connecting bracket; 10. Connecting conductor; 11. Starting resistor; 12. Static contact mounting bracket; 13. Disconnector operating mechanism; 14. Disconnector vertical connecting rod; 15. Operating insulator; 16. Earthing switch vertical link.

Detailed ways

The utility model will be further described in detail below in conjunction with specific embodiments, which are explanations of the utility model rather than limitations.

The isolating switch is a kind of switching equipment without a special arc extinguishing device. It is required to have a clearly visible fracture in the open state, and can reliably pass the normal operating current and short-circuit fault current in the closed state. In the opening position, there is an insulation distance between the contacts that meets the specified requirements and an obvious disconnection mark; in the closing position, it can carry the current under normal circuit conditions and the current under abnormal conditions (such as short circuit) within a specified time current switching device.

Example 1

The utility model discloses an open combined electric appliance, referring to Fig. 1, 2, 3, 4, 5, 6 and 7, comprising a fixed bracket, an isolating switch, a starting resistor 11, an operating insulator 15 and a grounding switch 3, and the fixed bracket includes Steel bracket 6, base frame 7, connecting bracket 9, first post insulator 4 and second post insulator 8, base frame 7 is connected to one side of steel support 6, first post insulator 4 and second post insulator 8 are installed on the bottom on the frame 7; the connection bracket 9 is arranged between the first post insulator 4 and the second insulator.

The isolating switch and the starting resistor 11 are both arranged on the connecting bracket 9 of the fixed bracket. The isolating switch is provided with a conductive switch knife 2, a vertical connecting rod 14 of the isolating switch and an operating mechanism 13 of the isolating switch. The conductive switch knife 2 of the isolating switch is installed On the connecting bracket 9 , the conductive switch knife 2 of the isolating switch is connected to the incoming line end of the starting resistor 11 , and the vertical connecting rod 14 of the isolating switch is installed on the operating mechanism 13 of the isolating switch. One end of the operating insulator 15 is connected to the chassis 7, and the other end is connected to the bottom of the disconnector switch 2. The vertical link 14 of the disconnector is arranged between the operating mechanism 13 of the disconnector and the operating insulator 15.

The starting resistor 11 is provided with a static contact 1, and a static contact installation bracket 12 is connected between the static contact 1 and the starting resistor 11, and the static contact 1 is connected to the outlet end of the starting resistor 11; when closing, the isolating switch The conductive switch blade 2 is in contact with the static contact 1.

A connecting conductor 10 is provided between the conductive switch blade 2 of the disconnector and the starting resistor 11 , and the connecting conductor 10 is located at one end of the conductive switch blade 2 of the disconnecting switch and the starting resistor 11 close to the connecting bracket 9 .

The grounding switch 3 is arranged on the base frame 7 , and the grounding switch 3 is connected with the starting resistor 11 . The earthing switch 3 is provided with an earthing switch vertical connecting rod 16 and an earthing switch operating mechanism 5, one end of the earthing switch vertical connecting rod 16 is connected to the chassis 7, and the other end is connected to the bottom of the isolating switch conductive knife 2; the earthing switch is vertically The connecting rod 16 is installed on the grounding switch operating mechanism 5 .

The conductive loop of the isolating switch is connected in parallel with the conductive loop of the starting resistor 11, and the conductive switch blade and the static contact 1 of the isolating switch are respectively connected to the incoming line end and the outgoing line end of the starting resistor 11.

Example 2

Referring to Figures 8, 9, 10 and 11, the difference from Embodiment 1 is that the isolating switch adopts a horizontal flip type isolating switch, the starting resistor 11 is installed on the static contact 1, and the static contact 1 is installed on the first post insulator 4 Above, the first post insulator 4, the grounding switch 3 and the vertical connecting rod 16 of the grounding switch are installed on the steel bracket 6, the vertical connecting rod 16 of the grounding switch is installed between the grounding switch 3 and the operating mechanism 5 of the grounding switch, the conductive gate of the isolation switch Knife 2 is installed on the operation insulator 15, and operation insulator 15, isolating switch operating mechanism 13 are installed on the steel support 6, and isolating switch vertical link 14 is installed between operating insulator 15 and isolating switch operating mechanism 13.

The utility model is an open combined electric appliance in the circuit of starting resistor 11 connected to the valve side of the transformer. The bypass switch adopts an isolating switch, and the starting resistor 11 is directly connected in parallel with the isolating switch. It is necessary to close the isolating switch and bypass the starting resistor 11 to complete the system startup. At the same time, in order to further reduce the occupied area of the equipment and simplify the layout structure of the starting circuit, the isolating switch and the resistor are formed into an open combination electrical appliance, and the structural layout of the starting circuit is innovated.

When the system is put into operation and the starting resistor 11 is required to work, the isolating switch is in an open state, and the resistance can effectively limit the starting current of the system; Close the switch and conduct the system circuit, so that the resistor will quit working. When the combined electrical appliance needs to be overhauled, the grounding switch operating mechanism 5 is operated, and the grounding switch 3 is closed. When not overhauling, the grounding switch 3 is in the opening position.

The above are only preferred embodiments of the utility model, and are not intended to limit the technical solution of the utility model. Those skilled in the art should understand that, without departing from the spirit and principles of the utility model, The technical solution can also undergo some simple modifications and replacements, and these modifications and replacements also fall within the scope of protection covered by the claims.

Claims (10)

1. The open type combined electrical appliance is characterized by comprising a fixed support, an isolating switch and a starting resistor (11), wherein the isolating switch and the starting resistor (11) are arranged on the fixed support, a conductive loop of the isolating switch is connected with a conductive loop of the starting resistor (11) in parallel, an isolating switch conductive knife switch (2) is arranged on the isolating switch, the isolating switch conductive knife switch (2) is connected with a wire inlet end of the starting resistor (11), a fixed contact (1) is arranged on the starting resistor (11), and the fixed contact (1) is connected with a wire outlet end of the starting resistor (11); when in closing, the isolating switch conductive knife (2) is contacted with the static contact (1).

2. The open-type electrical combiner according to claim 1, characterized in that the fixing bracket comprises a steel bracket (6), a chassis (7), a connecting bracket (9), a first post insulator (4) and a second post insulator (8), the chassis (7) being connected to the steel bracket (6), the first post insulator (4) and the second post insulator (8) being mounted on the chassis (7); the connecting bracket (9) is arranged between the first post insulator (4) and the second insulator; the isolating switch and the starting resistor (11) are connected with the connecting bracket (9).

3. Open-type electrical combiner according to claim 2, characterized in that the disconnector conducting blade (2) and the starting resistor (11) are mounted on a connection bracket (9).

4. An open-type electrical combiner according to claim 2, characterized in that the chassis (7) is arranged on one side of the steel bracket (6).

5. The open-type combined electrical appliance according to claim 2, wherein the isolating switch is further provided with an isolating switch vertical connecting rod (14) and an isolating switch operating mechanism (13), and the isolating switch vertical connecting rod (14) is mounted on the isolating switch operating mechanism (13).

6. The open-type combined electrical appliance according to claim 5, further comprising an operation insulator (15), wherein one end of the operation insulator (15) is connected with the chassis (7), the other end is connected below the isolating switch conductive knife (2), and the isolating switch vertical connecting rod (14) is arranged between the isolating switch operation mechanism (13) and the operation insulator (15).

7. The open-type combined electrical appliance according to claim 2, wherein a connecting conductor (10) is arranged between the isolating switch conductive knife (2) and the starting resistor (11), and the connecting conductor (10) is positioned at one end of the isolating switch conductive knife (2) and the starting resistor (11) close to the connecting bracket (9).

8. The open-type electrical combiner according to claim 2, further comprising a grounding switch (3) arranged on the chassis (7), the grounding switch (3) being connected to the starting resistor (11).

9. The open type combined electrical appliance according to claim 8, wherein the grounding switch (3) is provided with a grounding switch vertical connecting rod (16) and a grounding switch operating mechanism (5), one end of the grounding switch vertical connecting rod (16) is connected with the underframe (7), and the other end is connected below the isolating switch conductive knife switch (2); the grounding switch vertical connecting rod (16) is arranged on the grounding switch operating mechanism (5).

10. The open-type combined electrical appliance according to claim 1, wherein a stationary contact mounting bracket (12) is arranged between the stationary contact (1) and the starting resistor (11).