CN203813217U - An Improved PT1 Distribution Substation - Google Patents

Abstract

The utility model provides an improved PT1 type power distribution station. A 10 kV inlet wire is communicated to a transformer through a 10 kV load switch, and the transformer enables a 10 kV inlet wire voltage to be converted into a 0.4 kV voltage and then to be output. Furthermore, a 0.4 kV switch is used for being communicated with a 0.4 kV busbar, a plurality of outgoing wires arranged below the 0.4 kV busbar are respectively provided with an outgoing wire switch, and a set of 0.4 kV capacitors are connected to the 0.4 kV busbar through a capacitor switch. The 10 kV load switch is arranged on an SF6 ring main unit, and the 0.4 kV switch, the outgoing wire switch and the capacitor switch are arranged on a vacuum circuit breaker of a GGD cabinet. According to utility model, under the premise that an original scale and a main wiring mode are not changed, primary equipment of the power distribution station is replaced, the health level and the safety operation level of the equipment can be better improved, the workload of repairing and maintaining is reduced, and the reliability of power supply is improved.

Description

A kind of improved PT1 type power distribution station

Technical field

The utility model relates to power distribution field, particularly a kind of improved PT1 type power distribution station.

Background technology

To shopping centre and residential building when power supply, user generally requires higher to power supply reliability.Some power distribution stations that put into operation in the eighties, move a distribution transforming that capacity is 800kVA, and 10kV side is on-load switch inlet wire, and 0.4kV wiring adopts single bus scheme.

As shown in Figure 1, one road 10kV inlet wire is communicated to transformer through on-load switch S1, this transformer is exported after 10kV primary voltage is converted to 0.4kV, and further by 0.4kV switch S 2, be communicated with 0.4kV bus, eight outlets that this 0.4kV bus is divided into are provided with outlet switch separately, and one group of 0.4kV capacitor is connected to this bus by capacitor switch.

Fig. 2 is the floor plan of existing power distribution station, and high voltage load switch is used FN3-10 high voltage knife, controls being communicated with or disconnection between 10kV inlet wire and transformer; In low-pressure chamber, with PGL2 cabinet, as 0.4kV low voltage incoming line cabinet, 0.4kV low-pressure line-outgoing cabinet and capacitor box, arrange corresponding switch.

Yet equipment is outmoded in above-mentioned existing power distribution station, without standby redundancy, power supply reliability is poor, is difficult to meet growing electricity consumption requirement.And power distribution station to the power supply of shopping centre and residential building is limited by often in place, be difficult to expansion scale, transformation difficulty is large.

Utility model content

The purpose of this utility model is to provide a kind of improved PT1 type power distribution station, not changing under the prerequisite of original scale and main wiring mode, power distribution station primary equipment is changed, to improve equipment power supply reliability.

In order to achieve the above object, the technical solution of the utility model is to provide a kind of improved PT1 type power distribution station, and it comprises:

One road 10kV inlet wire is communicated to transformer through 10kV on-load switch, this transformer is exported after 10kV primary voltage is converted to 0.4kV, and further by 0.4kV switch, be communicated with 0.4kV bus, many the outlets that this 0.4kV bus is divided into are provided with outlet switch separately, and one group of 0.4kV capacitor is connected to this 0.4kV bus by capacitor switch;

10kV on-load switch is arranged at SF6 ring main unit, and described 0.4kV switch, outlet switch, capacitor switch are the vacuum circuit-breakers that is arranged at GGD cabinet.

Preferably, described 10kV on-load switch one end is connected with 10kV inlet wire, this 10kV on-load switch other end is by after fuse, current transformer minute two-way, leads up to capacity earth, and another road is connected to leading-out terminal and is connected to transformer by outlet cable.

Preferably, described 10kV on-load switch one end is connected with 10kV inlet wire, and this 10kV on-load switch other end is by Fen San road after current transformer, and two-way is connected to respectively electric capacity and the lightning arrester of ground connection, and another road is connected to leading-out terminal.

Preferably, the neutral ground form of described transformer is direct ground connection; The 10kV side of this transformer is provided with one group of lightning arrester.

Preferably, one group of SF6 ring main unit that 10kV on-load switch is set is positioned at hyperbaric chamber;

A 0.4kV low voltage incoming line cabinet that 0.4kV service entrance switch is set, four 0.4kV low-pressure line-outgoing cabinets that 2 outlet switchs are set separately, and a 0.4kV low-voltage capacitor box that capacitor switch is set is positioned at low-pressure chamber; Transformer is by the 0.4kV low voltage incoming line cabinet of low pressure copper busbar access low-pressure chamber.

Preferably, in SF6 ring main unit, be provided with SF6 warning device.

Compared with prior art, the PT1 type power distribution station that the utility model provides, do not changing under the prerequisite of original scale and main wiring mode, power distribution station primary equipment is changed, SF6 on-load switch is set and is equipped with SF6 warning device, be conducive to improve the general level of the health and the safety operation level of equipment, the workload of reduce maintenance, safeguarding, improves power supply reliability.

Accompanying drawing explanation

Fig. 1 is the electrical wiring schematic diagram of existing power distribution station;

Fig. 2 is the floor plan of existing power distribution station;

Fig. 3 is 10kV electrical wiring schematic diagram in PT1 type power distribution station described in the utility model;

Fig. 4 is 0.4kV electrical wiring schematic diagram in PT1 type power distribution station described in the utility model;

Fig. 5 is the floor plan of the utility model power distribution station.

Embodiment

As shown in Figure 3,4, the utility model provides a kind of PT1 type power distribution station (PT1 type, with the looped network power distribution station of 1 station power distribution transformer and 10kV outlet), one road 10kV inlet wire is communicated to transformer through 10kV on-load switch, this transformer is exported after 10kV primary voltage is converted to 0.4kV, and further by 0.4kV switch S 2, be communicated with 0.4kV bus, and eight outlets that this 0.4kV bus is divided into are provided with outlet switch S3 separately, and one group of 0.4kV capacitor is connected to this bus by capacitor switch S4.

10kV on-load switch is positioned at hyperbaric chamber, is equipped with 2 of 10kV line SF6 ring main units, 1 of 10kV distribution transforming SF6 ring main unit.

In SF6 ring main unit as shown in Figure 3, a switch cubicle uses following device mode to arrange: wherein one end of on-load switch is connected with 10kV inlet wire, this on-load switch other end is leaded up to capacity earth after by fuse, current transformer, and another road is connected to leading-out terminal and further by outlet cable, is connected to transformer; In each switch cubicle, be also provided with SF6 pressure indicator, capacitance voltage indicating device, display device for short circuit, three position switch auxiliary contact, gas pressure auxiliary contact, fuse auxiliary contact, etc.

Two other switch cubicle uses following another kind of device arrangements mode: on-load switch is by current transformer Hou Fen tri-tunnels, be connected to respectively electric capacity and the lightning arrester of leading-out terminal and ground connection, can pass through leading-out terminal connection transformer, or be connected to meet different wiring needs from the device in other switch cubicles.

Current period short circuit current level with reference to early stage equipment select, 10kV short circuit current level is pressed 20kA and is considered.Preferably the parameter of on-load switch is as follows: rated voltage 12 kV, rated current 630 A, nominal short-circuit capacity 346 MVA, specified drop-out current 20 kA, moving drop-out current peak value 50 kA, 4 seconds heat-stable current 20 kA of stablizing.

In addition, in conjunction with primary equipment transformation, corresponding line cable has been done to reconfiguration, all used flame retardant cable.For example, at 10kV side inlet wire, adopt ZA-YJV-8.7/10-3X70 cable, the outlet of distribution transforming 0.4kV side adopts low pressure copper bus-bar.Each position in storehouse primary equipment ground connection is used 5*40 band iron, and is connected with indoor ground connection main line.

10kV/0.4kV transformer is positioned at distribution transforming chamber, is used for changing 10kV primary voltage into 0.4kV output, and transformer neutral point ground connection form is direct ground connection.The 10kV inlet wire side of this transformer is provided with one group of 10kV inlet wire lightning arrester, plays lightning protection effect.

As shown in Figure 4, the switch of all 0.4kV sides is all positioned at 0.4kV switch gear room, and each switch all adopts vacuum circuit-breaker, can be communicated with or disconnect corresponding outlet or its power pack.In this power distribution station of the present utility model, be provided with altogether 1 0.4kV service entrance switch, 8 outlet switchs, 1 capacitor switch.Be equipped with altogether 1 of 0.4kV low voltage incoming line cabinet, 4,0.4kV low-pressure line-outgoing cabinet, 1 of 0.4kV low-voltage capacitor box, and assist and be furnished with SF6 warning device 1 cover.

That is, the 0.4kV low-pressure side of transformer is connected to 0.4kV bus by 0.4kV service entrance switch S2, current transformer, in 8 outlets dividing into, corresponding outlet switch S3 and current transformer is set separately.One group capacitor (240kVar) plays inactive power compensation, is arranged in capacitor panel, by capacitor switch S4, is connected to 0.4kV bus.

Be the floor plan of the utility model power distribution station as shown in Figure 5, one group of SF6 ring main unit 4 is positioned at hyperbaric chamber; In low-pressure chamber, be equipped with 6 GGD cabinets, P1 cabinet is the 0.4kV low voltage incoming line cabinet that 0.4kV service entrance switch is set, and P2-P5 cabinet is for to arrange the 0.4kV low-pressure line-outgoing cabinet of 2 outlet switchs separately, and P6 cabinet is the 0.4kV low-voltage capacitor box that capacitor switch is set; In this example, assist and be furnished with SF6 warning device 1 cover.Transformer is communicated with respectively the relevant device of hyperbaric chamber and low-pressure chamber by corresponding turnover cable.

According to the filthy rank of site, the creepage of current period engineering equipment selected by III level than distance, and 10V and following equipment are creepage than considering by 31mm/kV apart from outdoor, and the indoor 25mm/kV that presses considers.Below newly-increased each electrical room and protection screen screen cabinet, and Cable Reformation, related cable interlayer, floor through walls, wall, cabinet, dish place has cable cavern and gap to carry out fireproof blocking when newly-increased.And adopt fire prevention band to paste or painting fireproof paint the cable sheath within the scope of each 1m of shutoff place both sides.

As shown in Fig. 2, Fig. 5, in this example, can in Nei Dui hyperbaric chamber, existing site, transform with low pressure indoor equipment, without other expropriation of land.

In sum, the PT1 type power distribution station that the utility model provides, do not changing under the prerequisite of original scale and electrical wiring mode, power distribution station primary equipment is changed, SF6 on-load switch is set and is equipped with SF6 warning device, be conducive to improve the general level of the health and the safety operation level of equipment, the workload of reduce maintenance, safeguarding, improves power supply reliability.

Although content of the present utility model has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.Those skilled in the art, read after foregoing, for multiple modification of the present utility model with to substitute will be all apparent.Therefore, protection range of the present utility model should be limited to the appended claims.

Claims (6)

1. An improved PT1 type power distribution station, characterized in that it comprises: A 10kV incoming line is connected to the transformer through a 10kV load switch. The transformer converts the 10kV incoming line voltage to 0.4kV and then outputs it, and further connects to the 0.4kV bus through a 0.4kV switch. The multiple outgoing lines under the 0.4kV bus are respectively equipped with Outgoing switch, a group of 0.4kV capacitors are connected to the 0.4kV bus through capacitor switches; The 10kV load switch is set in the SF6 ring network cabinet, and the 0.4kV switch, outlet switch, and capacitor switch are vacuum circuit breakers set in the GGD cabinet. 2. The PT1 type distribution station as claimed in claim 1, characterized in that, One end of the 10kV load switch is connected to the 10kV incoming line, and the other end of the 10kV load switch is divided into two circuits after passing through a fuse and a current transformer. One is grounded through a capacitor, and the other is connected to the outlet terminal and connected to the transformer through an outlet cable. 3. The PT1 type distribution station according to claim 1, characterized in that, One end of the 10kV load switch is connected to the 10kV incoming line, and the other end of the 10kV load switch is divided into three circuits after passing through the current transformer. 4. The PT1 type distribution station according to claim 1, characterized in that, The neutral point grounding form of the transformer is direct grounding; a group of lightning arresters is installed on the 10kV side of the transformer. 5. The PT1 type distribution station according to claim 1, characterized in that, A group of SF6 ring main unit with 10kV load switch is located in the high voltage room; One 0.4kV low-voltage incoming line cabinet with 0.4kV incoming line switch, four 0.4kV low-voltage outgoing line cabinets with two outgoing line switches each, and one 0.4kV low-voltage capacitor cabinet with capacitor switch are located in the low-voltage room; the transformer passes through the low-voltage The copper busbar is connected to the 0.4kV low-voltage incoming cabinet in the low-voltage room. 6. The PT1 type distribution station as claimed in claim 2 or 3 or 5, characterized in that, An SF6 alarm device is installed in the SF6 ring network cabinet.