CN201813091U - Single-phase pre-installed box-type substation - Google Patents

Abstract

The utility model discloses a single-phase prepackaged box-type substation suitable for single-phase load places such as residential areas and street lamps and used for delivering single-phase AC power. The substation includes a box body which is divided into high-voltage room, transformer room, and low-voltage room. The high-voltage room is equipped with a high-voltage load switch cabinet, the low-voltage room is equipped with a low-voltage distribution cabinet, and the transformer room is equipped with a single-phase transformer; the cable socket on the single-phase transformer is connected to the high-voltage room. The high-voltage cable connection; the low-voltage side of the single-phase transformer is provided with a1 terminal, a2 terminal and grounding x terminal, and the low-voltage power distribution cabinet is provided with L1 connected to the a1 terminal, a2 terminal and x terminal of the single-phase transformer respectively. , L2, and N three main conductive busbars, L1, L2 pass through the incoming and outgoing switch, together with N, are connected to single-phase loads through low-voltage cables.

Description

Single-phase pre-installed box-type substation

Technical field

The utility model relates to a prepackaged box-type substation, in particular to a single-phase prepackaged box-type substation. the

Background technique

The pre-installed box-type substation is to pre-install high and low-voltage switchgear and transformers in one or several boxes to form a complete substation. At present, pre-packaged substations have developed rapidly in many fields such as factory power distribution, railways, and residential buildings. the

Most of the existing domestic box-type substations use three-phase AC transformers to realize low-voltage power supply, but because the power supply radius is too long, the terminal voltage will be too low, and the power loss will be large. According to statistics, the loss of the 10kV and below power grid accounts for 50% to 60% of the total system loss. Although the urban and rural power grids have been transformed, the line loss rate of the low-voltage distribution network still reaches about 10%. Moreover, since there are many power supply users in a substation, once a fault occurs, it will have a great impact on the reliability of power supply in densely populated residential areas. Moreover, ordinary household users and facilities such as street lighting generally only need single-phase voltage power supply. the

Contents of the invention

In order to solve the above problems, the purpose of this utility model is to provide a single-phase prepackaged box-type substation for direct transmission of single-phase AC power, which is used in single-phase load places such as residential areas and street lamps. the

The technical scheme that the utility model solves its technical problem adopts is:

A single-phase prefabricated substation, including a box body, which is divided into a high-voltage room, a transformer room, and a low-voltage room. The high-voltage room is equipped with a high-voltage load switch cabinet, which is connected to a power supply through a high-voltage cable. The transformer room is equipped with a single-phase transformer. The cable socket on the single-phase transformer is connected to the high-voltage cable from the high-voltage chamber; the whole box-type substation provides single-phase power supply to the load according to the power supply mode of single-phase three-wire system, and the low-voltage side of the single-phase transformer is provided with a1 terminal, a2 terminal and grounding x terminal, three main conductive busbars L1, L2 and N are respectively connected to the a1 terminal, a2 terminal and x terminal of the single-phase transformer in the low-voltage power distribution cabinet, and the L1 and L2 routes pass through the incoming and outgoing switches After that, together with the N road, it is connected with a single-phase load through a low-voltage cable. the

The cable socket of the single-phase transformer and the high-voltage cable are connected through a plug-in structure, which can ensure that the relevant conductors are in an insulated state to prevent electric shock. The single-phase transformer is provided with a cable socket seat, and the position of the cable socket socket is set on the upper part of the single-phase transformer facing the side of the high-voltage chamber, instead of the top or bottom of the traditional three-phase transformer. The bottom of the transformer room is provided with a cable routing hole for high-voltage cables to enter. The high-voltage cable passes through the hole at the bottom of the transformer room and enters the high-voltage switch room from the bottom to connect with the high-voltage switch. This arrangement is convenient for cable routing and is safe and reliable. the

The three compartments of the box body: high-voltage room, transformer room and low-voltage room are distributed in the shape of "mesh", and the transformer room is located in the middle. This arrangement can make the complete set of equipment compact in structure and small in floor space. the

The low-voltage power distribution cabinet of the single-phase prepackaged substation is equipped with a single-phase reactive power compensation device, which includes a reactive power compensation device that takes the voltage and current measurements of the L1 or L2 road as input signals. The controller and the contactor for switching capacitors of L1 and L2 are controlled by the reactive power compensation controller. L1 and L2 two-way co-compensation are adopted, that is, the measured value of the voltage and current of L1 or L2 is used as the input control signal of the reactive power compensation controller, and the reactive power compensation controller controls the contactor to switch L1 and L2 after calculation. Two-way capacitors are switched at the same time to achieve the effect of compensating L1 and L2 at the same time. Compared with the traditional method of "three-phase compensation", it can further accurately improve the power factor, which is conducive to stabilizing the line voltage and reducing line loss. the

The single-phase pre-installed box-type substation can realize active and reactive energy measurement for single-phase loads; in order to reduce equipment waste, the low-voltage incoming and outgoing line switches use special two-pole circuit breakers instead of small air circuit breakers. The traditional design It is a three-pole high-current circuit breaker. the

The substation of the utility model has the following advantages: it can realize direct power supply of low-voltage single-phase AC power supply, improve the quality of power supply voltage, reduce the loss of low-voltage lines, and reduce the length of low-voltage transmission lines; the connection between single-phase transformers and high-voltage cables adopts plug-in, full The shielding insulation structure can ensure that the relevant conductors are in an insulated state, prevent electric shock, and is safe and reliable during operation; the substation of the utility model has complete electrical functions, and the single-phase reactive power compensation effect is good, which can realize active and reactive power compensation for single-phase loads. Energy metering; compact structure, small footprint. the

Description of drawings

Fig. 1 is the internal structure schematic diagram of the substation of the utility model embodiment;

Fig. 2 is the overall structural representation of the utility model embodiment;

Fig. 3 is a schematic circuit diagram of an embodiment of the utility model. the

In the figure 1. Cabinet; 2. High-voltage load switch cabinet; 3. High-voltage room; 4. Single-phase transformer; 5. Transformer room; 6. Low-voltage power distribution cabinet; 7. Low-voltage room; 8. Cable routing hole; 9 , cable socket; 10, aluminum-zinc coated steel plate; 11, electric energy metering device; 12, single-phase reactive power compensation device; 13, contactor; 14, reactive power compensation controller K; 15, two-pole circuit breaker; 16, Current transformer; 17. High voltage cable. the

Detailed ways

Below, the technical solution of the utility model will be further described in conjunction with the accompanying drawings and specific embodiments, but the utility model is not limited to the following embodiments. the

As shown in the figure, the single-phase pre-installed box-type substation includes a box body 1, and the box body 1 is divided into three independent compartments, which are a high-voltage room 3, a transformer room 5, and a low-voltage room 7 in sequence; the three compartments are in the form of "目" font arrangement. the

The high-voltage chamber 3 is provided with a high-voltage load switch cabinet 2, which is connected to a power supply through a high-voltage cable. The transformer room 5 is provided with a single-phase transformer 4, and the single-phase transformer 4 is provided with a cable socket 9, and the position of the cable socket 9 is set on the upper side of the single-phase transformer 4, and the cable socket 9 and the high-voltage cable pass through a plug-in structure. connect. The high-voltage cable 17 passes through the cable routing hole 8 at the bottom of the transformer room, and enters the high-voltage load switch cabinet 2 from the bottom to connect with the high-voltage switch, thereby saving the length of the connecting cable. The low-voltage side of the single-phase transformer 4 is provided with three terminals a1, a2 and grounding x. In this way, two independent single-phase AC power sources with opposite phases but the same amplitude are formed between a1 and x, a2 and x. The low-voltage room 7 is equipped with a low-voltage power distribution cabinet 6 according to the modular design. The low-voltage power distribution cabinet is provided with three main conductive busbars L1, L2, and N, which are connected to the three terminals a1, a2, and x of the single-phase transformer 4 respectively. The branch busbars of each outlet circuit are drawn from the main conductive busbar. The L1 and L2 roads pass through the incoming and outgoing line switches 15, and the N roads are connected through low-voltage single-phase cables and single-phase loads. The incoming and outgoing line switches 15 in this embodiment are dedicated. Two-pole circuit breaker, as shown in Figure 3. The corresponding L1, L2, and N branch busbars form a standard outlet unit, so that each outlet unit contains two independent single-phase AC power sources with opposite phases but the same amplitude. The load is connected to L1, N or L2, N circuits to form a single-phase three-wire power supply mode. the

The low-voltage power distribution cabinet 6 is provided with a single-phase reactive power compensation device 12 and an active and reactive energy metering device 11 . This single-phase prefabricated substation adopts L1 and L2 two-way co-compensation, connects the voltage signal of L1 or L2 and the current signal output by current transformer 16 to the reactive power compensation controller 14, and uses the reactive power compensation controller 14 Control the contactor 13 to cut and switch the capacitors of L1 and L2, and switch the capacitors at the same time to achieve the effect of compensating the two circuits of L1 and L2 at the same time. the

Claims (6)

1. A single-phase prefabricated substation, comprising a box body (1), which is divided into a high-voltage room (3), a transformer room (5), and a low-voltage room (7), characterized in that: the high-voltage room (3) A high-voltage load switch cabinet (2) is installed, a low-voltage power distribution cabinet (6) is installed in the low-voltage room (7), and a single-phase transformer (4) is installed in the transformer room (5); on the single-phase transformer (4) The cable socket (9) is connected to the high-voltage cable (17) connected to the high-voltage chamber (3); the low-voltage side of the single-phase transformer is provided with a1 terminal, a2 terminal and grounding x terminal, and the low-voltage power distribution cabinet is provided with respectively The three main conductive busbars L1, L2, and N connected to the a1 terminal, a2 terminal, and x terminal of the single-phase transformer, the L1, L2 lines pass through the incoming and outgoing line switches, and the N line is connected to the single-phase load through a low-voltage cable. 2. The single-phase prefabricated substation according to claim 1, characterized in that: the cable socket (9) is located on the upper part of the single-phase transformer (4) facing the high-voltage room, and the bottom of the transformer room (5) is equipped with a power supply The cable routing hole (8) where the high-voltage cable enters, and the high-voltage cable (17) is connected with the cable socket (9) through the cable routing hole (8) by a plug-in structure. 3. The single-phase prefabricated substation according to claim 2, characterized in that: the high-voltage room (3), the transformer room (5) and the low-voltage room (7) are arranged in the shape of a "mesh", and the transformer room (5 ) is in the middle. 4. The single-phase prefabricated substation according to any one of claims 1-3, characterized in that: the low-voltage power distribution cabinet (6) is provided with a single-phase reactive power compensation device, and the single-phase reactive power compensation device It includes a reactive power compensation controller (14) using the voltage and current measurement values of the L1 or L2 circuit as an input signal, and a contactor (13) for controlling switching of capacitors of the L1 and L2 circuits through the reactive power compensation controller. 5. The single-phase prefabricated substation according to claim 4, characterized in that: the incoming and outgoing switch (15) is a two-pole circuit breaker. 6. The single-phase prefabricated substation according to claim 5, characterized in that: active and reactive energy metering devices (11) are also installed in the cabinet. the

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