CN211930090U - 10kV high-voltage switch cabinet with built-in voltage transformer - Google Patents

Abstract

The utility model belongs to the technical field of power supply switch device, in particular to a 10kV high-voltage switch cabinet with a built-in voltage transformer, which comprises a cabinet body, wherein the cabinet body comprises a front breaker chamber, a bus chamber, a grounding device chamber and an instrument chamber, the top of the grounding device chamber is provided with the current transformer, the bottom of the grounding device chamber is fixed with a one-way vacuum breaker and a zero sequence current transformer through a bracket, the front end of the one-way vacuum breaker is provided with a low excitation impedance transformer, and the rear end of the one-way vacuum breaker is provided with the; the outlet end of the single-phase vacuum circuit breaker is connected with the low excitation impedance transformer, and the low excitation impedance transformer penetrates through the zero sequence current transformer through a grounding cable and is connected with the ground. The utility model discloses it is excellent to single-phase earth fault arc extinguishing performance, can extensively be used for 10kV system single-phase ground connection arc extinction, suppression intermittent type nature ground connection overvoltage, reduce the injury of inductance of electricity personnel, protection electrical equipment safety.

Description

10kV high-voltage switch cabinet with built-in voltage transformer

Technical Field

The utility model belongs to the technical field of the power supply switch device, especially, relate to a built-in voltage transformer's 10kV high tension switchgear.

Background

Along with the construction of a power grid, the grounding current of a 10kV system is continuously increased, the requirement of the system cannot be met by using a vacuum contactor, and particularly, when two-phase or three-phase grounding short circuit occurs, because the vacuum contactor does not have the short circuit breaking capacity, an interval switch cabinet needs to be additionally configured to be used as a backup protection, so that the occupied space is increased. Therefore, the utility model provides a built-in voltage transformer's 10kV high tension switchgear.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a simple structure, area are little, convenient operation, reliable safety, can realize single-phase ground connection arc extinction, overvoltage protection, prevent the 10kV high tension switchgear of personal electric shock.

In order to achieve the above object, the utility model adopts the following technical scheme:

a10 kV high-voltage switch cabinet with a built-in voltage transformer comprises a cabinet body, wherein the cabinet body is divided into a front breaker chamber, a bus chamber, a grounding device chamber and an instrument chamber according to different functions, the top of the grounding device chamber is provided with the current transformer, the bottom of the grounding device chamber is fixedly provided with a one-way vacuum breaker and a zero sequence current transformer through a support, the front end of the one-way vacuum breaker is provided with a low excitation impedance transformer, and the rear end of the one-way vacuum breaker is provided with the voltage transformer;

the outlet end of the single-phase vacuum circuit breaker is connected with the low excitation impedance transformer, and the low excitation impedance transformer penetrates through the zero sequence current transformer through a grounding cable and is connected with the ground.

Furthermore, a guide rail is arranged in the front circuit breaker chamber, a chassis vehicle is arranged on the guide rail, and a front three-phase linkage circuit breaker is arranged on the chassis vehicle; the guide rail is provided with a working position and a testing position, and the chassis vehicle moves between the working position and the testing position.

Furthermore, a sleeve is arranged in the bus chamber, main bus bars are arranged in the sleeve and are connected in a penetrating mode through single splicing mode, and the main bus bars are fixedly connected with the upper static contact of the chassis vehicle sequentially through branch buses and the row connecting device.

Furthermore, a microcomputer protection control device, an operating handle, a protection outlet pressing plate, an instrument, a status indicator lamp and an electrified display are arranged on a door of the instrument room, and a terminal strip, a microcomputer protection control loop direct-current power switch, a microcomputer protection working direct-current power switch, an energy storage motor working power switch, a power switch required by a grounding device and special secondary equipment are arranged in the instrument room.

Furthermore, the cabinet body is in a KYN28-12A standard switch cabinet form, and the shell of the cabinet body is formed by assembling aluminum-zinc coated steel plates through multiple bending forming by a CNC (computer numerical control) machine tool and then using bolts.

Further, the number of the sleeves is three.

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

the utility model discloses a be equipped with current transformer at the earthing device roof of the cabinet body, the bottom of earthing device room is fixed with one-way vacuum circuit breaker and zero sequence current transformer through the support, and the front end of one-way vacuum circuit breaker is equipped with the low excitation impedance transformer, and the rear end of one-way vacuum circuit breaker is equipped with voltage transformer; the outlet end of the single-phase vacuum circuit breaker is connected with the low excitation impedance transformer, and the low excitation impedance transformer penetrates through the zero sequence current transformer through a grounding cable and is connected with the ground. The voltage transformer can effectively prevent the ferromagnetic resonance of a low-current grounding power grid besides the measurement function, and sends out corresponding signals according to setting when a 10kV system is grounded or disconnected. The grounding device chamber realizes grounding protection, saves additional spaced switch cabinets and reduces the cost.

The utility model discloses function protection is perfect, and when taking place single-phase earth fault, the corresponding single-phase vacuum circuit breaker 5 combined floodgates of control realize single-phase earth protection. When the system has a three-phase short circuit fault, the output of the current transformer exceeds a set value, the preposed three-phase linkage breaker is opened, and the device exits the running state. The utility model discloses collect functions in an organic whole such as ground connection phase selection, ground connection route selection, fault location and automatic reset, can restrain intermittent type nature ground connection overvoltage, reduce the injury of inductance of electricity personnel, protection electrical equipment safety, single-phase vacuum circuit breaker have two relative ground short circuit ability of breaking, but three-phase linkage circuit breaker is as reserve protection breaking system short-circuit current. The single-phase vacuum circuit breaker is a permanent magnet mechanism, can be operated for 50000 times without maintenance, is enough to deal with the frequently-occurring single-phase earth faults, and can be widely applied to a 10kV system.

Drawings

FIG. 1 is a schematic structural diagram of a 10kV high-voltage switch cabinet with a built-in voltage transformer;

FIG. 2 is a left side view of a 10kV high-voltage switch cabinet with a built-in voltage transformer;

fig. 3 is a top view of a 10kV high-voltage switch cabinet with a built-in voltage transformer.

Wherein: 1-main bus bar; 2-front three-phase linkage breaker; 3-a charged display sensor; 4-chassis vehicle; 5-single-phase vacuum circuit breaker; 6-low excitation impedance transformer; 7-zero sequence current transformer; 8-a ground cable; 9-a voltage transformer; 10-a current transformer; 11-a row connecting device; 12-a lower contact; 13-an upper contact; 14-branch bus; 15-a cannula; 16-a cabinet body; 100-front breaker chamber; 200-a bus bar compartment; 300-a ground device chamber; 400-instrument room.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, the 10kV high-voltage switch cabinet with the built-in voltage transformer comprises a cabinet body 16, wherein the cabinet body 16 is in a KYN28-12A standard switch cabinet form, and the shell is formed by assembling aluminum-zinc coated steel plates through multiple bending forming by a CNC machine tool and then using bolts.

The compartments of the cabinet 16 are divided into a front breaker compartment 100, a bus compartment 200, a grounding device compartment 300, and an instrument compartment 400 according to functions.

The front circuit breaker chamber 100 is internally provided with a guide rail, the guide rail is provided with a chassis truck 4, the guide rail is provided with a working position and a test position, and the chassis truck 4 can move between the working position and the test position. The chassis truck 4 is provided with a front three-phase linkage breaker 2.

Three sleeves 15 are arranged in the bus chamber 200, main bus bars 1 are arranged in the sleeves, the main bus bars 1 are spliced and mutually connected in a penetrating manner, and the main bus bars 1 are fixedly connected with the upper static contact 13 of the chassis truck 4 sequentially through branch buses 14 and the row connecting device 11. If the switch cabinet has an arc fault, the sleeve can effectively limit the accident in the bus through air buffering reserved between the sleeve and the bus, and the accident is not spread to other cabinets.

The top of the grounding device chamber 300 is provided with a current transformer 10, the bottom of the grounding device chamber 300 is fixed with a zero sequence current transformer 7 and three one-way vacuum circuit breakers 5 through a bracket, the front end of the one-way vacuum circuit breaker 5 is provided with a low excitation impedance transformer 6, and the rear end of the one-way vacuum circuit breaker 5 is provided with a voltage transformer 9; the outlet end of the current transformer 10 is respectively connected with the inlet end of the voltage transformer 9 and the inlet end of the single-phase vacuum circuit breaker 5 through the connector 11, the outlet end of the single-phase vacuum circuit breaker 5 is connected with the low excitation impedance transformer 6, and the low excitation impedance transformer 6 penetrates through the zero sequence current transformer 7 through the grounding cable 8 to be connected with the ground.

The instrument room 400 is provided with a microcomputer protection and control device, an operating handle, a protection outlet pressing plate, an instrument, a status indicator lamp and an electrified display on the door. The instrument room 400 is provided with a terminal block, a microcomputer protection control circuit direct current power switch, a microcomputer protection working direct current power switch, an energy storage motor working power switch, a power switch required by a grounding device and other special secondary equipment.

The utility model discloses a use-way does:

after confirming that the circuit breakers are good and have no problem, the movable parts of the chassis truck 4 and the front three-phase linkage circuit breaker 2 are arranged on the running vehicle and locked, the chassis truck 4 and the front three-phase linkage circuit breaker 2 are moved to enable the chassis truck 4 and the front three-phase linkage circuit breaker 2 to be in the test positions, all cabinet doors are closed and locked, the front three-phase linkage circuit breaker 2 is confirmed to be in the brake separating position, the chassis truck 4 can be switched to the working position from the test position, the front three-phase linkage circuit breaker 2 is closed, and the device is put into operation. The ground protection control device monitors the operation of the system, judges that a single-phase ground fault occurs, controls the corresponding single-phase vacuum circuit breaker 5 to be switched on, realizes single-phase ground protection, and controls the switched-on single-phase vacuum circuit breaker 5 to be switched off after the single-phase ground fault disappears. When out-of-phase grounding occurs in the switching-on protection process of the single-phase vacuum circuit breaker 5, the output of the zero sequence current transformer 7 in the switch cabinet exceeds a set value, and the grounding protection control device controls the single-phase vacuum circuit breaker 5 to be switched off and quit the protection state. When the system has a three-phase short circuit fault, the output of the current transformer 4 exceeds a set value, the front three-phase linkage breaker 2 is opened, and the device is withdrawn from the running state.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims (6)

1. The utility model provides a built-in voltage transformer's 10kV high tension switchgear, includes the cabinet body (16), the cabinet body (16) are including being leading circuit breaker room (100), bus-bar room (200), earthing device room (300) and instrument room (400), its characterized in that: a current transformer (10) is arranged at the top of the grounding device chamber (300), a one-way vacuum circuit breaker (5) and a zero sequence current transformer (7) are fixed at the bottom of the grounding device chamber (300) through a support, a low excitation impedance transformer (6) is arranged at the front end of the one-way vacuum circuit breaker (5), and a voltage transformer (9) is arranged at the rear end of the one-way vacuum circuit breaker (5);

the line outlet end of the current transformer (10) is connected with the line inlet end of the voltage transformer (9) and the line inlet end of the single-phase vacuum circuit breaker (5) through the line connecting device (11), the line outlet end of the single-phase vacuum circuit breaker (5) is connected with the low excitation impedance transformer (6), and the low excitation impedance transformer (6) penetrates through the zero sequence current transformer (7) through the grounding cable (8) to be connected with the ground.

2. The 10kV high-voltage switch cabinet with the built-in voltage transformer as claimed in claim 1, wherein: a guide rail is arranged in the front circuit breaker chamber (100), a chassis (4) is arranged on the guide rail, and a front three-phase linkage circuit breaker (2) is arranged on the chassis (4); the chassis truck (4) moves between the working position and the testing position.

3. The 10kV high-voltage switch cabinet with the built-in voltage transformer as claimed in claim 2, wherein: be equipped with sleeve (15) in bus-bar room (200), all be equipped with main generating line row (1) in sleeve (15), main generating line row (1) is the mutual through connection of single concatenation, main generating line row (1) loop through branch bus (14), even arrange ware (11) with the last static contact (13) fixed connection of chassis car (4).

4. The 10kV high-voltage switch cabinet with the built-in voltage transformer as claimed in claim 3, wherein: a microcomputer protection control device, an operation handle, a protection outlet pressing plate, an instrument, a state indicator lamp and an electrified display are arranged on a door of the instrument room (400), and a terminal block, a microcomputer protection control loop direct-current power switch, a microcomputer protection working direct-current power switch, an energy storage motor working power switch, a power switch required by a grounding device and secondary equipment are arranged in the instrument room (400).

5. The 10kV high-voltage switch cabinet with the built-in voltage transformer as claimed in claim 1, wherein: the cabinet body (16) adopts a KYN28-12A standard switch cabinet form, and the shell of the cabinet body (16) is formed by assembling aluminum-zinc coated steel plates through multiple bending forming by a CNC machine tool and then using bolts.

6. The 10kV high-voltage switch cabinet with the built-in voltage transformer as claimed in claim 3, wherein: the number of the sleeves (15) is three.

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