CN203813216U - 10 kV ring network power distribution station - Google Patents

Abstract

A 10 kV ring network power distribution station comprises a first-section bus and a second-section bus which are connected in series through a section switch cabinet, each section bus is connected with an inlet loop and two outlet loops, and the outlet loops are connected with a power distribution unit. The 10 kV ring network power distribution station provides sufficient power supplies to cable ring network additionally installed in a core area.

Description

10kV ring network distribution station

technical field

The utility model relates to a 10kV ring network distribution station.

Background technique

Shanghai is the largest city in my country, one of the four central municipalities, and the center of my country's economy, finance, trade and shipping. In 2012, Shanghai's GDP reached 2.01 trillion yuan, ranking 11th in the world. Both the per capita GDP and per capita disposable income rank first in all provinces, autonomous regions and municipalities directly under the Central Government. Shanghai is currently in a critical period of "industrial transformation" and is striving to build "four centers" - an international economic center, an international financial center, an international trade center, and an international shipping center. This puts forward higher requirements for the city's power supply capacity. .

Shanghai Pudong New Area covers an area of 1210.41 square kilometers. Since the Party Central Committee and the State Council decided to "Pudong Development" in the 1990s, it has experienced more than 20 years of development. It has built Jinqiao, Zhangjiang National Development Zone, Waigaoqiao Free Trade Zone, Lujiazui Finance and Trade Zone, etc. focus area. On July 3, 2013, the "China (Shanghai) Pilot Free Trade Zone" was approved and settled in 28 square kilometers along the coast of Pudong New Area, marking a new starting point for Shanghai's development. As the largest and most dynamic district and county in the city, Pudong New Area leads the city in many aspects including economic development and industrial transformation.

The construction scope of the distribution network in the Pudong core area is the core area along the Huangpu River in Pudong, west to the Huangpu River, north to the Huangpu River, east to Pudong South Road, and south to Yaohua Road, covering an area of about 10 square kilometers. The rapid growth of power load in this core area and the natural extension of distribution network lines inevitably lead to problems such as blurred boundaries, crossed lines, and circuitous power supply, which affect the reliability of power supply and the leanness of line loss.

On the basis of comprehensive evaluation of distribution network operation level and power supply capacity, by analyzing the problems existing in the current distribution network, it is concluded that the 10kV distribution network is an absolute factor affecting the power supply reliability of Pudong power grid, and the planned power outage is the most important factor affecting the Pudong power grid. The main factor of power supply reliability. To improve the reliability of power supply, it is the fundamental way to strengthen the 10kV medium-voltage distribution network and reduce the impact of planned power outages, which requires the distribution network to have flexible load transfer capabilities. Looking at the planning and development of urban power grids in advanced international regions, similar conclusions can be drawn. A solid distribution network grid structure and flexible load transfer capabilities are the foundation of a modern distribution network.

The ring network distribution station is a type of indoor distribution station. The incoming line of the ring network distribution station has no protection, and the outgoing line has relay protection. Circuit breakers are used, and distribution transformers can be configured according to needs. The incoming line of the currently used ring network distribution station is not equipped with optical fiber differential protection, which has poor reliability.

Utility model content

The utility model provides a 10 kV ring network distribution station, the incoming line is equipped with optical fiber vertical difference protection, and the function of the ring network distribution station as a substation and switch station 10kV bus extension is fully utilized to provide sufficient power for adding a cable ring network in the core area. Power supply.

In order to achieve the above purpose, the utility model provides a 10 kV ring network power distribution station, the 10 kV ring network power distribution station includes the first section of the bus and the second section of the bus connected in series through the segmented switch cabinet, each section of the bus One incoming line and two outgoing lines are respectively connected, and the outgoing lines are also connected to the power distribution device.

The incoming line is connected to a substation or a switching station, and the incoming line includes a current transformer and a load switch connected in series. The current transformer detects the current of the incoming line and if the current value of the incoming line is greater than the set value, the load switch is disconnected.

The outgoing line includes a load switch and a current transformer connected in series. The current transformer detects the current of the outgoing line. If the current value of the outgoing line is greater than a set value, the load switch is disconnected.

The section switch cabinet includes load switches and current transformers connected in series.

The power distribution device includes switch blades, fuses, distribution transformer high-voltage side current transformers, distribution transformers, distribution transformer low-voltage side current transformers and grounding switch blades connected in series. Grounded, usually disconnected, the fuse prevents the power distribution device from overcurrent, the current transformer on the high voltage side of the distribution transformer detects the amount of current that appears, the distribution transformer provides outgoing power, and the current transformer on the low voltage side of the distribution transformer detects the current flowing through the distribution transformer flow, the grounding knife is grounded during power distribution maintenance.

The utility model provides sufficient power supply for adding a cable ring network in the core area.

Description of drawings

Fig. 1 is a circuit diagram of the utility model.

Detailed ways

Below according to Fig. 1, the preferred embodiment of the present utility model is described in detail.

As shown in Figure 1, the utility model provides a 10 kV ring network distribution station, which includes a first section bus 201 and a second section bus 202 connected in series through a segmented switch cabinet 3, each section of the bus One incoming line 1 and two outgoing lines 4 are respectively connected, and the outgoing lines 4 are also connected to a power distribution device 5 .

The incoming line 1 is connected to a substation or a switching station. The incoming line 1 includes a current transformer 101 and a load switch 102 connected in series. The current transformer 101 detects the current of the incoming line. If the current value of the incoming line is greater than the set value, Then the load switch 102 is turned off.

The outgoing line 4 includes a load switch 401 and a current transformer 402 connected in series. The current transformer 402 detects the current of the outgoing line. If the current value of the outgoing line is greater than the set value, the load switch 401 is disconnected.

The section switch cabinet 3 includes a circuit breaker 301 and a current transformer 302 connected in series.

The power distribution device 5 includes a switch blade 501 connected in series, a fuse 502, a distribution transformer high-voltage side current transformer 503, a distribution transformer 504, a distribution transformer low-voltage side current transformer 505, and a grounding switch blade 506. The switch Knife 501 is grounded during the maintenance of power distribution device 5 and disconnected at ordinary times. Fuse 502 prevents overcurrent in the power distribution device. Current transformer 503 on the high voltage side of the distribution transformer detects the amount of current. The side current transformer 505 detects the amount of current flowing through the distribution transformer 504, and the grounding switch 506 is grounded during power distribution maintenance.

The ring network distribution station is a 10kV distribution station, and the scale of its incoming and outgoing lines is selected as two in and four out. The side detects the current phase and magnitude, and the outgoing current of the upper level is transmitted to the incoming line of the ring network distribution station through optical fiber. If the outgoing current of the upper level is inconsistent with the incoming line current of the station (greater than the protection setting value), it is considered that there is a problem with the line, and the protection The action disconnects the incoming line switch of this station and the corresponding outgoing line switch of the superior. The ring network distribution station adopts single busbar section, and the cross section of each incoming cable is 3×240mm ² , and the outgoing cable can be selected according to the load condition; the ring network distribution station sends 2 circuits of power incoming lines from different substations or switching stations , the maximum load rate of each line is 50%.

The incoming line of the utility model is equipped with optical fiber longitudinal differential protection, which fully exerts the function of the ring network distribution station as a substation and switch station 10kV bus extension, and provides sufficient power supply for the addition of a cable ring network in the core area.

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 (5)

1. A 10 kV ring network distribution station, characterized in that, the 10 kV ring network distribution station includes a first busbar (201) and a second busbar (201) connected in series through a segmented switch cabinet (3) 202), each section of the busbar is respectively connected to one circuit of incoming lines (1) and two circuits of outgoing lines (4), and the said outgoing lines (4) are also connected to the power distribution device (5). 2. The 10 kV ring network distribution station according to claim 1, characterized in that, the incoming line (1) is connected to a substation or a switching station, and the incoming line (1) includes a series connected current transformer (101) And the load switch (102), the current transformer (101) detects the current amount of the incoming line, if the current value of the incoming line is greater than the setting value, the load switch (102) is disconnected. 3. The 10 kV ring network distribution station according to claim 1, characterized in that, the outgoing line (4) includes a load switch (401) and a current transformer (402) connected in series, and the current transformer (402) Detect the current of the outgoing line, if the value of the current of the outgoing line is greater than the set value, then disconnect the load switch (401). 4. The 10 kV ring network distribution station according to claim 1, characterized in that, the section switch cabinet (3) includes load switches (301) and current transformers (302) connected in series. 5. The 10 kV ring network power distribution station according to claim 1, characterized in that, the power distribution device (5) includes a series switch knife (501), a fuse (502), a distribution transformer high voltage side current Transformer (503), distribution transformer (504), distribution transformer low-voltage side current transformer (505) and grounding switch (506), the switch knife (501) is grounded when the power distribution device (5) is overhauled, Usually disconnected, the fuse (502) prevents the power distribution device from overcurrent, the distribution transformer high-voltage side current transformer (503) detects the amount of current that appears, the distribution transformer (504) provides outgoing power, and the distribution transformer low-voltage side current transformer ( 505) Detect the amount of current flowing through the distribution transformer (504), and the grounding switch (506) is grounded during power distribution maintenance.