CN203813221U - PT1 type power distribution station - Google Patents

Abstract

The utility model provides a PT1 type power distribution station. Two incoming lines are connected to a transformer through a 10kV load switch. The transformer converts the 10kV incoming line voltage to 0.4kV for output, and further connects to a 0.4kV bus through a 0.4kV switch. There are multiple outlet switches under the 0.4kV bus to control the connection or disconnection of one or two outlets. The 10kV load switch is set in the SF ₆ ring network cabinet, and the 0.4kV switch and outlet switch are circuit breakers set in the GGD cabinet. The utility model replaces the primary equipment of the distribution station without changing the original scale and the main wiring mode, which is beneficial 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

A PT1 type distribution station

technical field

The utility model relates to the field of power distribution, in particular to a PT1 type distribution station. the

Background technique

When supplying power to commercial areas and residential buildings, users generally have relatively high requirements for power supply reliability. Some distribution substations put into operation in the 1980s run a distribution transformer with a capacity of 400kVA, the 10kV side is the load switch incoming line, and the 0.4kV wiring adopts single busbar wiring. the

As shown in Figure 1, the two lines of incoming lines are connected to the transformer through the load switch S1 and the fuse. There are six outgoing line switches S3 under the busbar, and each outgoing line switch S3 controls the connection or disconnection of one or two outgoing lines; there are eleven outgoing lines in this example. the

Figure 2 is the floor plan of the existing distribution station. The high-voltage load switch uses FN3-10 high-voltage switch to control the connection or disconnection between the 10kV incoming line and the transformer; the low-voltage room uses the PGL2 cabinet as the 0.4kV low-voltage incoming line cabinet. , 0.4kV low-voltage outlet cabinets, etc. to arrange the corresponding switches and equipment. the

However, the above-mentioned existing distribution stations have outdated equipment, no spare parts, and poor power supply reliability, making it difficult to meet the growing demand for electricity.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. the

Utility model content

The purpose of this utility model is to provide a PT1 distribution station, which can replace the primary equipment of the distribution station without changing the original scale and main wiring mode, so as to improve the reliability of power supply of the equipment. the

In order to achieve the above purpose, the technical solution of the utility model is to provide a PT1 type power distribution station, which includes:

The two incoming lines are connected to the transformer through a 10kV load switch. The transformer converts the 10kV incoming line voltage to 0.4kV for output, and further connects to the 0.4kV busbar through a 0.4kV switch. The 0.4kV busbar is equipped with multiple outgoing line switches to control one each. Or the connection or disconnection of two outgoing lines.

Preferably, the 10kV load switch is set in the SF ₆ ring network cabinet, and the 0.4kV switch and outlet switch are circuit breakers set in the GGD cabinet.

Preferably, 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. to the transformer. the

Preferably, 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 lines after passing through the current transformer, two lines are respectively connected to the grounded capacitor and lightning arrester, and the other end is connected to the outlet end. the

Preferably, the neutral point grounding form of the transformer is direct grounding; a group of lightning arresters are installed on the 10kV side of the transformer. the

Preferably, a group of SF ₆ ring network cabinets with 10kV load switches are 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 2 outgoing line switches each; the transformer is connected to the 0.4kV low-voltage incoming line cabinet in the low-voltage room through the low-voltage copper busbar.

Preferably, in order to set a total of eleven outgoing lines, among all eight outgoing line switches, five outgoing line switches control two outgoing lines respectively, and the other outgoing line switch controls one outgoing line; or, four outgoing line switches control two outgoing lines respectively. One outgoing line, the other three outgoing line switches control one outgoing line; or, three outgoing line switches each control two outgoing lines, and the other five outgoing line switches each control one outgoing line. the

Preferably, a group of 0.4kV capacitors connected to the 0.4kV bus bar through a capacitor switch is also provided, and the 0.4kV low-voltage capacitor cabinet where the capacitors are installed is placed in the low-voltage room. the

Preferably, an SF ₆ alarm device is provided in the SF ₆ ring network cabinet.

Compared with the prior art, the PT1 distribution station provided by the utility model replaces the primary equipment of the distribution station without changing the original scale and the main wiring mode, and installs SF ₆ load switches and equips with SF ₆ The alarm 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 the 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 PT1 type distribution station described in the utility model;

Fig. 4 is a schematic diagram of 0.4kV electrical wiring in the PT1 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 PT1 type distribution station (PT1 type, that is, a ring network distribution station with a distribution transformer and 10kV outgoing lines), two incoming lines pass through a 10kV load switch S1 Connected to the transformer, the transformer converts the 10kV incoming line voltage to 0.4kV and outputs it, and further connects to the 0.4kV busbar through the 0.4kV switch S2. There are six outgoing line switches S3 under the 0.4kV busbar, and each outgoing line switch S3 controls a Or the connection or disconnection of two outgoing lines; there are eleven outgoing lines in this example. the

The 10kV load switch is located in the high-voltage room, equipped with 2 SF ₆ ring network cabinets for 10kV incoming and outgoing lines, and 1 SF ₆ ring network cabinet for 10kV distribution transformer.

In the SF ₆ ring network cabinet shown in Figure 3, a switchgear is arranged in the following way: one end of the load switch is connected to the 10kV incoming line, and the other end of the load switch passes through the fuse and the current transformer, and then passes through the capacitor. Grounding, the other is connected to the outlet terminal and further connected to the 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 contacts, fuse auxiliary contacts, etc.

The other two switchgears use the following another device arrangement: the load switch is divided into three circuits after passing through the current transformer, which are respectively connected to the outlet terminal and the grounded capacitor and lightning arrester, and can be connected to the transformer through the outlet terminal, or connected to other switch cabinets The devices in are matched and connected to meet different wiring needs. the

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 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. the

In addition, combined with an equipment transformation, the corresponding incoming and outgoing cables were reconnected, and flame-retardant cables were used. For example, the ZA-YJV-8.7/10-3X70 cable is used for the 10kV side incoming line, and the low-voltage copper busbar is used for the 0.4kV side outgoing line of the 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. the

The 10kV/0.4kV transformer is located in the distribution room and is used to convert the 10kV incoming line voltage to 0.4kV output, and the neutral point grounding form of the transformer is direct grounding. A group of 10kV incoming lightning arresters are installed on the 10kV incoming line side of the transformer to protect against lightning. the

As shown in Figure 4, all switches on the 0.4kV side use switch cabinets located in the 0.4kV switch room, and each switch uses a circuit breaker to connect or disconnect the corresponding outgoing line or its power supply part. The power distribution station of the utility model is equipped with a 0.4kV low-voltage incoming line cabinet on one side, which is used to set a 0.4kV incoming line switch S2, so that the 0.4kV low-voltage side of the transformer passes through the 0.4kV incoming line switch S2 and the current transformer. Connect to 0.4kV bus. the

It is also equipped with 4 sides of 0.4kV low-voltage outlet cabinets, which can be equipped with up to 8 outlet switches S3 and current transformers connected to 0.4kV busbars. In order to set a total of eleven outgoing lines, in this example, a corresponding number of outgoing line switches can be combined according to actual needs, and each outgoing line switch can be used to control the connection or disconnection of one or two outgoing lines. For example, in the method shown in Figure 1, six outlet switches are used: each of the five outlet switches is connected to two outlet lines, and the other outlet switch is connected to one outlet line, that is, 5*2+1. Alternatively, seven outlet switches can be used to construct 4*2+3, or eight outlet switches can be used to construct a 3*2+5 outlet mode. the

In addition, it is equipped with 1 side of 0.4kV low-voltage capacitor cabinet, and a group of capacitors (120kVar) can be installed for reactive power compensation, so that the capacitors can be connected to the 0.4kV bus through capacitor switches. the

As shown in Figure 5 is the layout of the utility model power distribution station, a group of SF ₆ ring network cabinets 4 are located in the high-voltage room; the low-voltage room is equipped with 6 GGD cabinets, P1 cabinet is a 0.4kV low-voltage cabinet with a 0.4kV incoming line switch Incoming line cabinets, P2-P5 cabinets are 0.4kV low-voltage outgoing line cabinets with two outgoing line switches, and P6 cabinet is a 0.4kV low-voltage capacitor cabinet; in this example, it is equipped with a set of SF ₆ alarm devices. The transformer is connected to the corresponding equipment in the high-voltage room and the low-voltage room through corresponding 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. the

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. the

To sum up, the PT1 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 SF ₆ load switch and SF ₆ alarm device , which 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.

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. the

Claims (9)

1. a PT1 type power distribution station, is characterized in that, comprises:

Two-way 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 being further communicated with 0.4kV bus by 0.4kV switch, this 0.4kV bus is divided into multiple outlet switchs and controls separately connection or the disconnection of one or two outlet.

2. PT1 type power distribution station as claimed in claim 1, is characterized in that,

10kV on-load switch is arranged at SF ₆ring main unit, described 0.4kV switch, outlet switch are the circuit breakers that is arranged at GGD cabinet.

3. PT1 type power distribution station as claimed in claim 1, is characterized in that,

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

4. PT1 type power distribution station as claimed in claim 1, is characterized in that,

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.

5. PT1 type power distribution station as claimed in claim 1, is characterized in that,

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.

6. PT1 type power distribution station as claimed in claim 1, is characterized in that,

One group arranges the SF of 10kV on-load switch ₆ring main unit is positioned at hyperbaric chamber;

One arranges the 0.4kV low voltage incoming line cabinet of 0.4kV service entrance switch, and four arrange the 0.4kV low-pressure line-outgoing cabinet of 2 outlet switchs separately; Transformer is by the 0.4kV low voltage incoming line cabinet of low pressure copper busbar access low-pressure chamber.

7. PT1 type power distribution station as claimed in claim 6, is characterized in that,

For totally ten one outlets are set, in all eight outlet switchs, make wherein five outlet switchs control separately two outlets, outlet of another outlet switch control; Or, make wherein four outlet switchs control separately two outlets, another three outlet switchs are controlled an outlet separately; Or, make wherein three outlet switchs control separately two outlets, another five outlet switchs are controlled an outlet separately.

8. PT1 type power distribution station as claimed in claim 6, is characterized in that,

The one group of 0.4kV capacitor that is connected to described 0.4kV bus by capacitor switch is also set, and the 0.4kV low-voltage capacitor box that this capacitor is installed is positioned in low-pressure chamber.

9. the PT1 type power distribution station as described in claim 2 or 3 or 4 or 6, is characterized in that,

At SF ₆in ring main unit, be provided with SF ₆warning device.