Contact box for low-voltage transformer area

Abstract

The utility model discloses a low-voltage transformer area contact box, which comprises a box body, a primary main loop is arranged in the box body, and the primary main loop comprises an electric operation unit circuit breaker used for switching on, switching off and protecting the primary main loop and an isolating switch used for isolating a power supply. The main bus bar is used for connecting the electric operating unit circuit breaker and the isolating switch; the mutual inductance unit is coupled with the main bus bar; one end of the electric operation unit circuit breaker is connected with a cable of one transformer area, the other end of the electric operation unit circuit breaker is connected with the main bus bar, the main bus bar is further connected with one end of the isolation switch, and the other end of the isolation switch is connected with a cable of the other transformer area; the system has the advantages that power supply switching processing can be carried out when the transformer area breaks down or is overhauled, and normal power utilization of production and life of residents in the transformer area is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of distribution boxes, and in particular relates to a low-voltage area connection box. Background Art

[0002] Currently, in the construction of distribution network projects, suburban and rural low-voltage substations are all powered independently. Generally, when a line fault or equipment failure occurs in a substation and requires maintenance, the entire substation must be shut down for maintenance. This power outage is widespread and has a significant impact on residential electricity consumption, commercial electricity consumption, and small industrial production electricity consumption, causing economic losses to electricity users and power supply companies.

[0003] Moreover, when the distribution transformer is heavily overloaded, it is necessary to add new distribution transformers or to cut and transfer loads from other substations, which sometimes requires extending a long distance to achieve. In such cases, there may be obstacles and other uncertainties during the implementation process, which will make the required time period longer.

[0004] The above problems have a great impact on the normal electricity consumption of residents in the substation area. Once a fault occurs or a power outage is required for maintenance, it will affect the normal electricity consumption in the substation area.

[0005] Therefore, there is an urgent need for a solution that can transfer power when a fault or maintenance occurs in the substation area to ensure normal electricity use for residents in the substation area. Utility Model Content

[0006] The purpose of the utility model is to provide a low-voltage area connection box, so as to realize power supply transfer when a fault occurs or maintenance occurs in the area.

[0007] The technical solution adopted by the utility model is as follows: a low-voltage substation area connection box, comprising a box body, wherein the box body comprises a primary main circuit, wherein the primary main circuit comprises an electric operation unit circuit breaker for switching on and off and protecting the primary main circuit, an isolating switch for isolating a power supply, a main busbar for connecting the electric operation unit circuit breaker and the isolating switch, and a mutual inductance unit coupled to the main busbar;

[0008] One end of the electric operation unit circuit breaker is connected to a cable in one substation area, and the other end of the electric operation unit circuit breaker is connected to the main bus bar. The main bus bar is also connected to one end of the disconnector, and the other end of the disconnector is connected to a cable in another substation area.

[0009] Preferably, the mutual inductance unit includes a first mutual inductance unit for measurement and a second mutual inductance unit for metering.

[0010] Preferably, the box body further includes a secondary circuit, the secondary circuit includes an electric operating mechanism control circuit, and the electric operating mechanism control circuit is connected to the electric operating unit in the electric operating unit circuit breaker.

[0011] Preferably, a meter is installed in the box, and a digital display is installed on the box;

[0012] The digital display is connected to the first mutual inductor unit; the meter is connected to the second mutual inductor unit.

[0013] Preferably, the box is further provided with a cable gland for fixing and protecting the cable.

[0014] Preferably, the box is also provided with a metering and collection terminal for collecting electricity and uploading data.

[0015] Preferably, the metering and data collection terminal is connected to the meter via a communication bus, and the metering and data collection terminal is also connected to an external metering system via wireless communication.

[0016] Preferably, the top cover of the box body adopts a ridge structure.

[0017] Preferably, the box body is a stainless steel box body, and there are no exposed detachable bolts outside the box body.

[0018] The adoption of the above technical solution has the following advantages: the utility model proposes a low-voltage substation connection box, which includes an electric operating unit circuit breaker for switching on and off and protecting the primary main circuit, an isolating switch for isolating the power supply, a main busbar for connecting the electric operating unit circuit breaker and the isolating switch, and a mutual inductance unit coupled to the main busbar; one end of the electric operating unit circuit breaker is connected to a cable of one substation, and the other end of the electric operating unit circuit breaker is connected to the main busbar, and the main busbar is also connected to one end of the isolating switch, and the other end of the isolating switch is connected to a cable of another substation; it realizes the technical effect that power supply can be transferred when a fault or maintenance occurs in the substation to ensure normal electricity use for residents in the substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the connection of a primary main circuit in a low-voltage substation junction box according to an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the connection of a control circuit of an electric operating mechanism provided in an embodiment of the present utility model;

[0021] Figure 3 This is a side view of a low-voltage area connection box provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the drawings and specific embodiments. The description here does not mean that all the subjects corresponding to the specific examples stated in the embodiments are cited in the claims.

[0023] Reference Figure 1 As shown, the present application provides a low-voltage substation area connection box, including a box body, characterized in that the box body includes a primary main circuit, the primary main circuit includes an electric operation unit circuit breaker for switching on and off and protecting the primary main circuit, an isolating switch for isolating the power supply, a main busbar for connecting the electric operation unit circuit breaker and the isolating switch, and a mutual inductance unit coupled to the main busbar;

[0024] One end of the electric operation unit circuit breaker is connected to a cable in one substation area, and the other end of the electric operation unit circuit breaker is connected to the main bus bar. The main bus bar is also connected to one end of the disconnector, and the other end of the disconnector is connected to a cable in another substation area.

[0025] It should be noted that the connection box is used to connect the power feeders of two substations, so that the substation lines are connected. When there is a power outage in any of the substations, the low-voltage substation connection distribution box can be used as a connection switch, and the other substation will supply power to it, which facilitates the cutting and transfer of loads between substations.

[0026] Figure 1 L1, L2 and L3 represent cables in one substation; L11, L12 and L13 represent cables in another substation; ABC represents the main busbar; 1QF represents the electric operation unit circuit breaker; 1QS represents the disconnector.

[0027] In a specific implementation, the mutual inductance unit includes a first mutual inductance unit for measuring and a second mutual inductance unit for metering; that is, Figure 1 Among them, 1TA-C: measuring current transformer, 2TA-C: metering current transformer.

[0028] The specific working process is as follows:

[0029] When the substation line operates normally, the electric operation unit circuit breaker is in the open state, and the disconnector is in the open state. When the primary substation line or equipment outgoing line fails (the primary substation residential load is in the power-off state), (the power supply incoming line side of the electric operation unit circuit breaker is in the power-off state), the disconnector is closed through the operating handle of the disconnector, and then the electric operation unit circuit breaker is electrically closed; at this time, the primary substation line or equipment is energized, and the primary substation residential load is transferred from the secondary substation to realize normal power supply in the primary substation;

[0030] Similarly, when the outgoing line or equipment in the secondary circuit substation fails (the residential load in the secondary circuit substation is in a power-off state), (the power supply input side of the isolating switch is in a power-off state), the isolating switch is closed through the operating handle of the isolating switch, and then the electric operation unit circuit breaker is electrically closed. At this time, the line or equipment in the secondary circuit substation is energized, and the residential load in the secondary circuit substation is transferred from the primary circuit substation to achieve normal power consumption in the secondary circuit substation.

[0031] In this embodiment, a meter is further installed in the box, and a digital display is further installed on the box; the digital display is connected to the first mutual inductor unit; and the meter is connected to the second mutual inductor unit.

[0032] The box also includes a secondary circuit, which includes an electric operating mechanism control circuit. The electric operating mechanism control circuit is connected to the electric operating unit in the electric operating unit circuit breaker.

[0033] The electric operating mechanism control circuit includes relays, fuses, push button switches and corresponding indicator lights. The specific connection structure is as follows Figure 2 As shown;

[0034] Figure 2 This is the control circuit of the 1QF electric operation unit circuit breaker. The opening and closing of the circuit breaker are realized through the interlocking of the start and stop of the closing and opening buttons SH and SF and the auxiliary contacts of the intermediate relay KA. Among them, the control power comes from both sides of the electric operation unit circuit breaker, which can ensure that the circuit breaker can be opened and closed electrically when power is supplied from the first substation, and can also ensure that the circuit breaker can be opened and closed when power is supplied from the second substation.

[0035] In this embodiment, the electrically operated unit circuit breaker uses an electronic tripping device based on microprocessor technology, which has high tripping accuracy, high operational reliability, and is less affected by the external environment, and has the following characteristics:

[0036] 1) Overload protection: It has an overload long-delay inverse time overcurrent action release, which can adjust the overload protection current according to the load demand of the substation to ensure the coordination of line protection and the overload protection operation of the transformer;

[0037] 2) Short-circuit protection: It has instantaneous protection function to prevent the expansion of damage caused by short circuit between lines and ensure stable and reliable operation of the power grid;

[0038] 3) Equipped with electric operating unit and auxiliary contacts for switch status indication and later automation information collection;

[0039] 4) It can be poured and used without reducing the capacity.

[0040] Furthermore, the box body is also provided with a cable gland for fixing and protecting the cable; at the same time, it can also prevent water and other substances from entering the box body.

[0041] Furthermore, a metering and collection terminal for collecting electricity and uploading data is also provided in the box.

[0042] Specifically, the metering and data collection terminal is connected to the meter via a communication bus, and is further connected to an external metering system via wireless communication; wherein the communication bus may be RS485 or Modbus.

[0043] like Figure 3 As shown, in this embodiment, the top cover of the box body adopts a ridge structure; the box body is a stainless steel box body, such as a 304 stainless steel shell, which has sufficient mechanical strength and shall not be deformed or damaged during lifting, transportation, and installation; the box door is sealed and waterproof, and there are no exposed detachable bolts outside the box body; the door axis is concealed, and the box door should be able to open more than 90 degrees. After closing, the door handle rotates past the dead point, and the lock tongue is inserted up and down at the same time.

[0044] Through the low-voltage substation connection box, the substation lines are connected, and power can be transferred during power outages, which facilitates the cutting and transfer of loads between substations. In addition to power outages caused by distribution transformer faults, there are also planned power outages that are normally required for line maintenance. When these situations occur, since there is a connection between the substation lines, power can be transferred first when a power outage occurs in the substation, which helps to avoid considering which substation to extend from and whether the extension path is reasonable when load cutting and transfer are required. This can greatly shorten working time and help maintenance personnel find the release point in a shorter time when cutting and transferring loads, greatly improving the communication performance between substations. It can still ensure normal power consumption in the substation, and minimize the impact of power outages in the substation on residents' lives.

[0045] By applying the low-voltage substation interconnection distribution box provided in this application, the application prospects are broad, and the load cutting and transfer between substations can be more effectively realized, while improving construction efficiency and reducing the impact of project implementation on the lives of surrounding residents.

[0046] Finally, it should be noted that the above description is a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention. Such changes fall within the scope of protection of the present invention.

Claims

1. A low-voltage area contact box, comprising a box body, characterized in that: The box includes a primary main circuit, which includes an electric operating unit circuit breaker for switching on and off and protecting the primary main circuit, an isolating switch for isolating the power supply, a main busbar for connecting the electric operating unit circuit breaker and the isolating switch, and a mutual inductance unit coupled to the main busbar; One end of the electric operation unit circuit breaker is connected to a cable in one substation area, and the other end of the electric operation unit circuit breaker is connected to the main bus bar. The main bus bar is also connected to one end of the disconnector, and the other end of the disconnector is connected to a cable in another substation area.

2. A low-voltage area contact box according to claim 1, characterized in that: The mutual inductance unit includes a first mutual inductance unit for measuring and a second mutual inductance unit for metering.

3. A low-voltage area contact box according to claim 1 or 2, characterized in that: The box also includes a secondary circuit, which includes an electric operating mechanism control circuit. The electric operating mechanism control circuit is connected to the electric operating unit in the electric operating unit circuit breaker.

4. A low-voltage area contact box according to claim 2, characterized in that: A meter is also installed in the box, and a digital display is also installed on the box; The digital display is connected to the first mutual inductor unit; the meter is connected to the second mutual inductor unit.

5. The low-voltage area contact box according to claim 3, characterized in that: The box body is also provided with a cable gland for fixing and protecting the cable.

6. The low-voltage area contact box according to claim 4, characterized in that: The box is also provided with a metering and collecting terminal for collecting electricity and uploading data.

7. A low voltage area connection box according to claim 6, characterized in that: The metering and data collection terminal is connected to the meter via a communication bus, and is also connected to an external metering system via wireless communication.

8. The low-voltage area connection box according to claim 7, characterized in that: The top cover of the box body adopts a ridge structure.

9. The low-voltage area connection box according to claim 8, characterized in that: The box body is a stainless steel box body, and there are no exposed detachable bolts outside the box body.

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