CN203813222U - Two-input two-output PT2 power distribution station with subsections - Google Patents

Abstract

The utility model provides a two-input two-output PT2 power distribution station with subsections. Two paths of 10kV inlet wires are respectively communicated with a 10kV first section bus and a 10kV second section bus, and are respectively communicated with a No.1 transformer and a No.2 transformer through respective SF6 load knife switches, and supply power to a 0.4kV first section bus and a plurality of outlet wires thereof, and a 0.4kV second section bus and a plurality of outlet wires thereof. The 0.4kV first section bus and the plurality of outlet wires thereof, and the 0.4kV second section bus and the plurality of outlet wires thereof are connected with corresponding transformers through corresponding 0.4kV inlet switches; the 10kV first section bus is connected to the 10kV second section bus through a 10kV section switch; and the 0.4kV first section bus is connected to the 0.4kV second section bus through a 0.4kV section switch. The SF6 load knife switches are arranged in an SF6 ring network cabinet, and the 0.4 kV inlet switches are arranged in a GGD cabinet. According to the utility model, primary equipment of the power distribution station is replaced on the premise of not changing the original scale and the main wire connecting mode.

Description

A PT2 type substation with two inputs and two outputs with segments

technical field

The utility model relates to the field of electric power distribution, in particular to a PT2 type distribution station with two inputs and two outputs with segments. the

Background technique

When supplying power to commercial areas and residential buildings, users generally have relatively high requirements for power supply reliability. In some distribution substations put into operation in the 1990s, the main wiring adopts a two-input and two-outlet mode with segments.

As shown in Figure 1, one 10kV incoming line is connected to No. 1 transformer through switch S1 and switch S11, and the other 10kV incoming line is connected to No. 2 transformer through switch S2 and switch S21. The 10kV first-stage and second-stage busbars pass through two sections Switch S3 and lead wire connection. Surge arresters are installed at the 10kV first and second section busbars and the 10kV incoming line sides of No. 1 and No. 2 transformers. Afterwards, No. 1 transformer supplies power to the 0.4kV first-stage bus and its six outgoing lines connected to it through switch S14, and No. 2 transformer supplies power to the 0.4kV second-stage bus and its six outgoing lines connected to it through switch S24; 0.4kV The section bus is connected through the section switch S31 and lead wires; No. 1 and No. 2 0.4kV capacitors are respectively connected to the 0.4kV section one and section two busbars through their respective capacitor switches.

Figure 2 is the layout diagram of the existing distribution station. Two low-voltage incoming cabinets 1, six low-voltage outgoing cabinets 2, two capacitor cabinets 3 and one low-voltage section cabinet 4 are installed in the low-voltage room to place the 0.4kV side related equipment. Four high-voltage cabinets 6 are placed in the high-voltage room to place the above-mentioned related devices on the 10kV side. Transformers No. 1 and No. 2 are connected to corresponding high-voltage cabinets 6 and low-voltage incoming cabinets 1 through several cables.

However, the equipment in the above-mentioned existing distribution substations is outdated (usually using GG1A high-voltage cabinets and PGL low-voltage cabinets), there are no spare parts, and the reliability of power supply is poor, so it is difficult to meet the growing demand for electricity. However, distribution stations that supply power to commercial areas and residential buildings are often limited by the site, making it difficult to expand the scale and difficult to transform.

Utility model content

The purpose of this utility model is to provide a PT2-type distribution station with two inlets and two outlets with segments. Under the premise of not changing the original scale and main wiring mode, the primary equipment of the distribution station can be replaced to improve the power supply of the equipment. reliability.

In order to achieve the above purpose, the technical solution of the present utility model is to provide a PT2-type power distribution station with two inputs and two outputs, which includes:

One 10kV incoming line is connected to a 10kV section of busbar, and is also connected to No. 1 transformer through a set of SF6 load switch. After conversion to 0.4kV, it is connected to a 0.4kV section of busbar and its multi-section after No. 1 transformer through a set of 0.4kV incoming line switch. outlet power supply;

Another 10kV incoming line is connected to the 10kV second-section busbar, and it is also connected to the No. 2 transformer through another set of SF6 load switch. Segment busbar and its multiple outgoing lines supply power;

The first 10kV busbar is connected to the second 10kV busbar through a 10kV sectional switch; the first 0.4kV busbar is connected to the second 0.4kV busbar through a 0.4kV sectional switch.

Preferably, the SF6 load switch is set in the SF6 ring network cabinet;

The 0.4kV incoming line switch is set in the GGD cabinet.

Preferably, one end of the SF6 load switch is connected to the 10kV incoming line through a copper busbar, and the other end of the SF6 load switch is divided into two paths through a fuse and a current transformer, one path is grounded through a capacitor, and the other path is connected to Outgoing terminal and connected to No. 1 or No. 2 transformer through the outgoing cable.

Preferably, one end of the SF6 load switch is connected to the 10kV incoming line through a copper busbar, and the other end of the SF6 load switch is divided into three circuits after passing through a current transformer, two of which are respectively connected to the grounded capacitor and the lightning arrester, and the other Connect to outlet.

Preferably, the neutral point grounding form of No. 1 and No. 2 transformers is direct grounding; a group of lightning arresters are respectively installed on the 10kV sides of No. 1 and No. 2 transformers.

Preferably, each outgoing line of the 0.4kV first-stage busbar and the 0.4kV second-stage busbar is respectively provided with an outlet switch;

The two sets of capacitors are respectively connected to the 0.4kV first-stage busbar and the 0.4kV second-stage busbar through corresponding capacitor switches; each 0.4kV incoming line switch, 0.4kV sectional switch, outgoing line switch, and capacitor switch are all set in the GGD cabinet Vacuum circuit breaker.

Preferably, two sets of high-voltage cabinets respectively equipped with SF6 load switch knives are located in the high-voltage chamber;

Two low-voltage incoming cabinets with 0.4kV incoming switches, six low-voltage outgoing cabinets with outgoing switches, two capacitor cabinets, and one low-voltage section cabinet with 0.4kV section switches are located in the low-voltage room;

Transformers No. 1 and No. 2 are respectively connected to the high-voltage cabinet in the high-voltage room through corresponding incoming and outgoing cables, and connected to the low-voltage incoming cabinet in the low-voltage room through low-voltage copper bus bars.

Compared with the existing technology, the PT2 type distribution station provided by the utility model replaces the primary equipment of the distribution station without changing the original scale and electrical connection mode, and is equipped with SF6 load switch knife and SF6 alarm The device is conducive to improving the health level and safe operation level of the equipment, reducing the workload of inspection and maintenance, and improving the reliability of power supply.

Description of drawings

Figure 1 is a schematic diagram of the electrical wiring of an existing distribution station;

Figure 2 is a layout plan of the existing distribution station;

Fig. 3 is a schematic diagram of 10kV electrical wiring in the PT2 type distribution station described in the utility model;

Fig. 4 is a schematic diagram of 0.4kV electrical wiring in the PT2 type distribution station described in the utility model;

Fig. 5 is a plane layout diagram of the distribution station of the present invention.

Detailed ways

As shown in Figures 3 and 4, the utility model provides a PT2 type distribution station (PT2 type, that is, a ring network distribution station with 2 transformers and 10kV outgoing lines), and the main wiring still adopts two in and two out with segments The 0.4kV wiring adopts the single-bus section wiring method. That is, one 10kV incoming line is powered by 10kV/0.4kV No. 1 transformer, 0.4kV busbar and its six outgoing lines, and the other 10kV incoming line is 10kV/0.4kV No. 2 transformer, 0.4kV second-section busbar and its six outgoing lines powered by. The 10kV first and second busbars are connected through 10kV section switches and lead wires; the 0.4kV first and second section busbars are connected through 0.4kV section switch and lead wires.

Two sets of 10kV high-voltage cabinets are located in the high-voltage room, and SF6 load switches are used to connect or disconnect the corresponding 10kV incoming lines. In this example, the above-mentioned 10kV high-voltage cabinet adopts the SF6 ring network cabinet as shown in Figure 3. Among them, two switch cabinets are arranged in the following device way: one end of the SF6 load switch is connected to the 10kV incoming line through the copper busbar connection, the other end of the SF6 load switch knife passes through the fuse and current transformer, and then one path is grounded through the capacitor, and the other path is connected to the outlet terminal and further connected to the No. 1 or No. 2 transformer through the outlet cable; each switch cabinet is also equipped with SF6 pressure indicator, capacitor voltage indicator, short circuit fault indicator, three-position switch auxiliary contact, gas pressure auxiliary contact, fuse auxiliary contact, etc.

There are four switchgears using the following another device arrangement: SF6 load switch is divided into three circuits after passing through the current transformer, and connected to the outlet terminal and grounded capacitor and lightning arrester respectively, and can be connected to the corresponding transformer through the outlet terminal , or cooperate with other devices in the switch cabinet to meet different wiring needs (for example, the SF6 load switch arranged in the former way is used as a 10kV incoming line switch, and the SF6 load switch arranged in the latter way is used as a connection to the arrester. Switches or section switches on the bus, etc., cooperate with each other to construct the wiring scheme shown in Figure 1, etc.).

The short-circuit current level of this period is selected with reference to the previous equipment, that is, the short-circuit current level of 10kV is considered as 20kA. The parameters of the optimal load switch knife are as follows: rated voltage 12 kV, rated current 630 A, rated breaking capacity 346 MVA, rated breaking current 20 kA, dynamic stable breaking current peak value 50 kA, 4-second thermal stable current 20 kA.

In addition, combined with an equipment transformation, the corresponding incoming and outgoing cables were reconnected, and flame-retardant cables were used. For example, ZA-YJV-8.7/10-3X70 cable is used for the incoming line on the 10kV side, and ZA-YJV-8.7/10-3X70 cable is used for the outgoing line of the 10kV distribution transformer. 5*40 flat iron is used for the grounding of the primary equipment in each position, and is connected to the indoor grounding trunk line.

Transformer No. 1 and Transformer No. 2 are two 10kV/0.4kV transformers, which are located in No. 1 and No. 2 distribution room respectively. These two transformers respectively transform their 10kV incoming line voltage into 0.4kV output, and the neutral point of the transformer is grounded. for direct grounding. A set of lightning arresters are respectively installed on the 10kV incoming line sides of No. 1 and No. 2 transformers to play the role of lightning protection.

As shown in Figure 4, all switches on the 0.4kV side use a 0.4kV complete switchgear located in the 0.4kV switch room, and each switch uses a vacuum circuit breaker to connect or disconnect the corresponding outgoing line or its power supply part. The power distribution station of the utility model is provided with 2 0.4kV incoming line switches, 12 outgoing line switches, 2 capacitor switches, and 1 0.4kV section switch.

That is, the 0.4kV low-voltage side of No. 1 transformer is connected to a 0.4kV section of busbar through 0.4kV incoming switch Q14 and current transformer, and the corresponding outgoing line switch Q15 and current transformer are set on each of the 6 outgoing lines; No. 2 transformer The 0.4kV low-voltage side is connected to the 0.4kV second-section busbar through the 0.4kV incoming line switch Q24 and current transformer, and the other 6 outgoing lines are equipped with corresponding outgoing line switches Q25 and current transformers; 0.4kV first-stage and second-stage busbars A 0.4kV segment switch Q31 and lead wires are set between them.

Two sets of capacitors (240kVar) play the role of reactive power compensation and are respectively installed in two capacitor cabinets, and are connected to the 0.4kV primary and secondary busbars through corresponding capacitor switches Q26.

As shown in Figure 5 is the layout of the distribution station of the utility model, two groups of six 10kV high-voltage cabinets 6 (SF6 ring network cabinets) are located in the high-voltage chamber. Two 0.4kV low-voltage incoming line cabinets 1 (such as GGD2-02) with corresponding 0.4kV incoming line switches, six 0.4kV low-voltage outgoing line cabinets 2 (such as GGD2-38) with corresponding outgoing line switches, and two capacitor cabinets 3 ( Such as GGD), a low-voltage section cabinet 4 with 0.4kV section switch (such as GGD2-02) and several low-voltage copper busbars 5 (TMY-100×10) are located in the low-voltage room. Transformer No. 1 and Transformer No. 2 are respectively connected to corresponding equipment in the high-voltage room and the low-voltage room through incoming and outgoing cables.

According to the pollution level of the station site, the creepage ratio distance of the project equipment in this phase is selected according to Class III, that is, the creepage ratio distance of equipment with 10V and below is considered as 31mm/kV outdoors and 25mm/kV indoors. Fireproof sealing shall be carried out at all cable holes and gaps at the bottom of newly added power distribution device rooms and protective screen cabinets, as well as at cable interlayers, wall-through floors, walls, cabinets, and panels involved in cable renovation and new additions. And the cable sheath within 1m on both sides of the blockage shall be pasted with fireproof tape or coated with fireproof paint.

As shown in Figure 2 and Figure 5, in this example, the equipment in the high-pressure room and the low-voltage room can be remodeled within the existing station site without additional land acquisition.

To sum up, the PT2 distribution station provided by the utility model replaces the primary equipment of the distribution station without changing the original scale and electrical wiring mode, and installs SF6 load switch blades and SF6 alarm devices. It is conducive to improving the health level and safe operation level of equipment, reducing the workload of inspection and maintenance, and improving the reliability of power supply.

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions of the present utility model will be obvious to those skilled in the art after reading the above content. Therefore, the protection scope of the present utility model should be defined by the appended claims.

Claims (7)

1. two enter a PT2 type power distribution station for scene 2 band segmentation, it is characterized in that, comprise:

One road 10kV inlet wire is communicated with mono-section of bus of 10kV, also by a set of SF6 load plug-in strip, is communicated with No. 1 transformer, and the mono-section of bus of 0.4kV and many outlets thereof that convert to after 0.4kV as being connected to by a set of 0.4kV service entrance switch after No. 1 transformer are powered;

Another road 10kV inlet wire is communicated with bis-sections of buses of 10kV, also by another set of SF6 load plug-in strip, is communicated with No. 2 transformers, and the bis-sections of buses of 0.4kV and many outlets thereof that convert to after 0.4kV as being connected to by another set of 0.4kV service entrance switch after No. 2 transformers are powered;

Between bis-sections of buses of mono-section of bus of described 10kV and 10kV, by 10kV block switch, be connected; Between bis-sections of buses of mono-section of bus of described 0.4kV and 0.4kV, by 0.4kV block switch, be connected.

2. PT2 type power distribution station as claimed in claim 1, is characterized in that,

Described SF6 load plug-in strip is arranged at SF6 ring main unit;

Described 0.4kV service entrance switch is arranged at GGD cabinet.

3. PT2 type power distribution station as claimed in claim 2, is characterized in that,

One end of described SF6 load plug-in strip is connected with 10kV inlet wire by copper bus-bar, this SF6 load plug-in strip other end was by after fuse, current transformer minute two-way, lead up to capacity earth, another road is connected to leading-out terminal and is connected to No. 1 or No. 2 transformers by outlet cable.

4. PT2 type power distribution station as claimed in claim 2, is characterized in that,

One end of described SF6 load plug-in strip is connected with 10kV inlet wire by copper bus-bar, and this SF6 load plug-in strip 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.

5. the PT2 type power distribution station as described in any one in claim 1-4, is characterized in that,

The neutral ground form of No. 1, No. 2 transformer is direct ground connection; The 10kV side of No. 1, No. 2 transformer is installed respectively one group of lightning arrester.

6. PT2 type power distribution station as claimed in claim 5, is characterized in that,

In each outlet of mono-section of bus of 0.4kV and bis-sections of buses of 0.4kV, be respectively equipped with outlet switch;

Two group capacitors, by corresponding capacitor switch, are connected to respectively mono-section of bus of described 0.4kV and bis-sections of buses of 0.4kV; Each 0.4kV service entrance switch, 0.4kV block switch, outlet switch, capacitor switch are all the vacuum circuit-breakers that are arranged at GGD cabinet.

7. PT2 type power distribution station as claimed in claim 6, is characterized in that,

Two groups of high-voltage boards that SF6 load plug-in strip is set are respectively positioned at hyperbaric chamber;

The low voltage incoming line cabinet of two relative set 0.4kV service entrance switchs, the low-pressure line-outgoing cabinet of six relative set outlet switchs, two capacitor panels, a low pressure segmentation cabinet that 0.4kV block switch is set are positioned at low-pressure chamber;

No. 1, No. 2 transformers, by corresponding line cable, access respectively the high-voltage board in hyperbaric chamber, and by the low voltage incoming line cabinet of low pressure copper busbar access low-pressure chamber.