CN207117032U - A kind of PT cabinets with disconnecting switch - Google Patents

Abstract

The utility model discloses a kind of PT cabinets with disconnecting switch, including gas tank, independent agency operating room, separate cable compartment, secondary top case, the gas tank that independent agency operating room is located at common box type is anterior, secondary top case is located at the top of independent agency operating room, and separate cable compartment is located at the gas tank bottom of common box type；Three-station isolating grounding switch is set in gas tank, and the three-station isolating grounding switch is directly electrically connected with a bus, and a bus is directly electrically connected with insulator；The voltage transformer being arranged in separate cable compartment is installed on insulator by cable straight line.Installing one additional among a PT second part and bus connection has the three-station with isolation ground connection, line outage can not be had to when PT is changed and overhauled, disconnecting switch need to only be got to ground connection position, can safety open cabinet maintenance or change etc., the repair and maintenance time is greatlyd save, and can effectively reduce line outage number.

Description

A kind of PT cabinets with disconnecting switch

Technical field

It the utility model is related to ring main unit technical field, specifically a kind of PT cabinets with disconnecting switch.

Background technology

Looped network refers to ring distribution system, i.e. supply main forms the annular of a closure, and power supply is dry to this annular Line is powered, and passes through the outside distribution of high-voltage switch gear all the way again from main line.Such benefit is that each distribution branch road was both Can be with its left side main line power taking source, again can be by its right side main line power taking source.When left side, main line is out of order, and it is just from the right side Side main line continues to be powered, and when right side main line is out of order, just from left side, main line continues to be powered for it, so, Although general supply is single service, obtain being similar to the material benefit supplied power with double circuit for each distribution branch road, so as to Improve the reliability of power supply.

Looped network distribution system develops in some big and medium-sized cities of China than very fast.Looped network distribution switchgear, i.e., general institute The ring main unit said, it is a kind of metal enclosed switchgear, due to small volume, low cost, floor space are few, become secondary match somebody with somebody The most frequently used switchgear in electric system, turn into adapted case change, ring main unit, switching station, Suo Nei distribution substations, residential quarter at present One of leading products.

The excellent SF6 gases of gas-insulated ring network cabinet performance greatly reduce the external form of cabinet as dielectric Size.SF6 gas-insulated ring networks cabinet is not influenceed by external environmental condition change, can run+in the place of bad environments, even if Switch normal operation is also can guarantee that under the extreme cases such as water logging in short-term.Because SF6 gas-insulated ring network cabinets have many merits, with China and implement city net, the upgrading of rural power grids, ring main unit has obtained substantial amounts of application at home, especially nearly 5 years, ring main unit market Achieve rapid development.As State Grid Corporation of China's intellectuality, the implementation of high reliability distribution engineering, market are exhausted to SF6 gases The demand of edge ring main unit incrementally increases.

Existing ring main unit solution is to draw high voltage power supply from side cabinet using copper bar, be connected directly between mutual induction of voltage Once end on device PT, due to high-pressure section directly it is exposed in atmosphere, easily by such environmental effects, (such as condensation, air is wet Degree etc.), it is both dangerous, also easily reduce the life-span of voltage transformer.Further, since do not have between voltage transformer pt and a bus There is isolation earthing switch, when voltage transformer pt, which breaks down, to be needed to change, it is necessary to which the power-off of higher level's circuit could safeguard replacing, Significantly impact the stable power-supplying of circuit.

Utility model content

Purpose of utility model：In order to overcome the deficiencies in the prior art, the utility model, which provides a kind of band, keeps apart The PT cabinets of pass.

Technical scheme：In order to solve the above technical problems, a kind of PT cabinets with disconnecting switch of the present utility model, including gas Case, independent agency operating room, separate cable compartment, secondary top case, the gas tank that independent agency operating room is located at common box type is anterior, and two Secondary top case is located at the top of independent agency operating room, and separate cable compartment is located at the gas tank bottom of common box type；Three works are set in gas tank Position isolation earthing switch, the three-station isolating grounding switch are directly electrically connected with a bus, and a bus and insulator are straight Connect electrical connection；The voltage transformer being arranged in separate cable compartment is installed on insulator by cable straight line, and voltage is mutual Sensor power taking from main bus-bar, and by three-station isolating grounding switch cut off and keep at any time the high voltage of voltage transformer.

Wherein, gas tank is the case structure of sealing welding, is mounted therein with isolation earthing switch, insulator, and pass through one Secondary bus is electrically connected, the bottom setting pressure release component of gas tank, the pressure release mouth down of pressure release component, and insulation gas is filled with gas tank Body.

Wherein, secondary top case built with power module, be spaced apart, power module, be spaced apart and voltage transformer be electrically connected；Door Plate is fixed on before secondary top case by door hinge, and ammeter is housed on door-plate, can show the load current size of PT cabinets, door Door lock is housed on plate.

Wherein, independent agency operating room includes operation interface and sets operating mechanism in the inner, is equipped with operation interface Electrification display, electromagnetic lock, operation hole position interlock plate, electrification display are electrically connected with insulator, electromagnetic lock and power module It is electrically connected, disconnecting switch division handle hole, earthed switch division handle hole is provided with operation interface.

Beneficial effect：A kind of PT cabinets with disconnecting switch of the present utility model, have the advantages that：

Installing one additional among a PT second part and bus connection has the three-station with isolation ground connection, can be in PT Do not have to line outage during replacing maintenance, disconnecting switch need to only be got to ground connection position, you can the maintenance of safety open cabinet or replacing etc., significantly The repair and maintenance time is saved, and can effectively reduce line outage number.And use full-insulated full-sealed tangible technology, nothing Exposed aerial high potential, ensure that product is not affected by, and extends the life-span of product and ensure that production The high-performance of product.

Brief description of the drawings

Fig. 1 is the right apparent direction structural representation of the present utility model for going left plate；

Fig. 2 faces direction schematic diagram to be of the present utility model；

Fig. 3 is the backsight direction structure schematic diagram of the present utility model for going back plate；

Fig. 4 removes top plate overlook direction schematic diagram to be of the present utility model.

Embodiment

The utility model is further described below in conjunction with the accompanying drawings.

As shown in Figure 1, Figure 2, Figure 3 shows, a kind of PT cabinets with disconnecting switch of the utility model, including the gas tank 1 of common box type, Independent agency operating room 2, separate cable compartment 4, secondary top case 3.The on-load switch 34 and three works of PT cabinets set in gas tank 1 Position isolation earthing switch 10 is by being directly electrically connected, and Up Highway UHW system is by shared three-phase bus A phase Up Highway UHWs copper bar 15, B Phase Up Highway UHW copper bar 14, C phase Up Highway UHWs copper bar 13 form, and three-station isolating grounding switch 10 passes through Down Highway system with insulator 5 The electrical connection of system 30, Down Highway system 30 is by A phase Down Highways copper bar 17, B phase Down Highways copper bar 18,16 groups of C phase Down Highways copper bar Into, it is installed to loaded on the voltage transformer 9 in separate cable compartment 4 by the diameter of phi 20mm straight line of cable 7 on insulator 5, The process of the power taking from main bus-bar of voltage transformer 9 is realized, realizes slitless connection and the master of PT cabinets and on-load switch ring main unit Direct electrical continuity on bus, reduces the conversion of intermediate link, both saves great amount of cost and space, decrease electricity Gas trouble point and leakage point, improve the electric property and stability of equipment.

As shown in accompanying drawing 1 and 3, independent agency operating room 2 is located at before the gas tank 1 of common box type, and secondary top case 4 is positioned at described 2 at the top of mechanism operating room, separate cable compartment 4 is located at the bottom of gas tank 1 of the common box type；The gas tank 1 of common box type is stainless steel The switch case 29 that sheet metal bending forms is mounted therein with three-station isolating grounding switch by the case structure of hermetically sealed welding 10th, on-load switch 34, insulator 5, and be electrically connected by Up Highway UHW system 31, Down Highway system 30, pressure release component 28 is located at The bottom of the midfeather of the gas tank 1 of common box type, pressure release mouth down, the gas tank 1 of common box type are filled with 0.14MPa SF6 gases, When overload, short circuit, earth fault occur for on-load switch 34 or three-station isolating grounding switch 10 in the gas tank 1 of common box type, make The pressure of the gas tank 1 of common box type significantly raises, when pressure is higher than pressure release 28 Opening pressure of component, in the gas tank 1 of common box type Pressure is discharged into the cable duct of the lower section of gas tank 1 of common box type by pressure release component 28, avoids the gas gone out by SF6 gases Personnel and the other equipment at scene are injured, ensures safety and reduces loss.

As described in Figure 2, secondary top case 4 built with power module, be spaced apart, be electrically connected with voltage transformer 9, and therefrom take Secondary power supply, the electric element of intelligent control for electromagnetic lock 20 and other loading switch cabinets 22 of common case provide electric energy, door-plate 37 It is fixed on by door hinge 38 before secondary top case 4, ammeter 35 is housed on door-plate 37, the load current of PT cabinets can be shown Size, door lock 36 is housed on door-plate 37, door-plate 37 can be opened in maintenance or electrical verification trial operation, division is spaced apart secondary to control The power supply supply of circuit.

Independent agency operating room 2 is built with operating mechanism 39, equipped with electrification display 23, electromagnetic lock in operation interface 19 20th, hole position interlock plate 32 is operated, electrification display 23 is electrically connected with insulator 5, and electromagnetic lock 20 is electrically connected with power module, Disconnecting switch division handle hole 24, earthed switch division handle hole 40 are provided with operation interface, it is mutual when that need to change or overhaul voltage During sensor 9, by the operating mechanism 39 of disconnecting switch division handle hole 24, disconnecting switch 10 is got into isolated bit, now PT cabinets Both voltage transformer 9 powers off for cable vault 4, and the power-off of electrification display 23 does not work, and electromagnetic lock 20 can be opened, and continue through ground connection and open The operating mechanism 39 of division handle hole 40 is closed, earthed switch 10 is got into ground connection position, now outgoing line side safety ground, ground connection interlocking is opened Open, lower door-plate 21 can open maintenance or change voltage transformer 9.

After the completion of overhauling or changing voltage transformer 9, lower door-plate 21 is closed, operating mechanism 39, earthed switch 10 is divided Lock, lower door-plate 21 have been locked by ground connection, can not now open lower door-plate 21, continue operating mechanism 39 by disconnecting switch 10 Closing position is got to, now cable vault 4 is powered, the live line work of electrification display 23, the electric blocking of electromagnetic lock 20, further pins Lower door-plate 21, realizes duplicate protection, prevented because the electric wiring of electromagnetic lock 20 damage or mechanical interlocking destroy and caused by it is powered Maintenance, substantially increase the safety of personnel and equipment.

Described above is only preferred embodiment of the present utility model, it should be pointed out that：For the common skill of the art For art personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and Retouching also should be regarded as the scope of protection of the utility model.

Claims (4)

1. A kind of 1. PT cabinets with disconnecting switch, it is characterised in that：Including gas tank, independent agency operating room, separate cable compartment, two Secondary top case, the gas tank that independent agency operating room is located at common box type is anterior, and secondary top case is located at the top of independent agency operating room, independent Cable compartment is located at the gas tank bottom of common box type；Three-station isolating grounding switch is set in gas tank, and three station isolation ground connection is opened Pass is directly electrically connected with a bus, and a bus is directly electrically connected with insulator；It is arranged in separate cable compartment Voltage transformer is installed on insulator by cable straight line, voltage transformer power taking from main bus-bar, makes PT and main bus-bar The direct electrical connection of all insulation, and cut off and keep at any time the height of voltage transformer electric by three-station isolating grounding switch Pressure.
2. A kind of 2. PT cabinets with disconnecting switch according to claim 1, it is characterised in that：Wherein, gas tank is sealing welding Case structure, be mounted therein with isolation earthing switch, insulator, and be electrically connected by a bus, the bottom of gas tank is set Put pressure release component, the pressure release mouth down of pressure release component, be filled with insulating gas in gas tank.
3. A kind of 3. PT cabinets with disconnecting switch according to claim 1, it is characterised in that：Wherein, secondary top case built with Power module, it is spaced apart, power module, is spaced apart and voltage transformer electrical connection；Door-plate is fixed on secondary top case by door hinge Above, ammeter is housed on door-plate, the load current size of PT cabinets can be shown, door lock is housed on door-plate.
4. A kind of 4. PT cabinets with disconnecting switch according to claim 3, it is characterised in that：Wherein, independent agency operating room Including operation interface and operating mechanism in the inner is set, equipped with electrification display, electromagnetic lock, operation hole position connection in operation interface Jam plate, electrification display are electrically connected with insulator, and electromagnetic lock is electrically connected with power module, are provided with and are kept apart in operation interface Close division handle hole, earthed switch division handle hole.