Photovoltaic current collection line energy-saving cabinet

Abstract

The utility model relates to the technical field of photovoltaic power stations, and provides a photovoltaic current collection line energy-saving cabinet which comprises a cabinet body, a first connecting piece penetrates through the front wall of the cabinet body, a second connecting piece penetrates through the rear wall of the cabinet body, and the first connecting piece is connected with one end of a second disconnecting switch. The other end of the second isolation switch is connected with one end of the PT fuse, one end of the first isolation switch and one end of the main loop contactor, and the other end of the main loop contactor is connected with one end of the resistor. The other end of the resistor is connected with the first end of the second current transformer, the second end of the second current transformer is connected with the first end of the first current transformer, the second end of the first current transformer is connected with the second connecting piece, the other end of the PT fuse is connected with the voltage transformer, and the other end of the first isolating switch is connected with the third end of the second current transformer.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic power stations, in particular to an energy-saving cabinet for photovoltaic collector circuits. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] In the currently operating photovoltaic power stations, the no-load loss of large-capacity photovoltaic step-up transformers is a major problem that plagues their economic operation. The power generation operation period of the collection line of domestic photovoltaic power stations is generally from 8:30 to 16:00, and the rest of the time is the no-load self-loss period, accounting for nearly 2 / 3. Since the collection line is composed of transformers and cables, its standby state loss is mainly transformer no-load loss and cable loss. Taking a standard 10MW collection line as an example, the annual no-load loss is about 110,000 kWh. For a 100MW photovoltaic power station, the annual no-load loss is at least 1.1 million kWh.

[0004] At present, photovoltaic power stations use a large number of solid-insulated cables with large capacity. When the box-type transformers are running at no-load at night, the system is prone to no-load harmonics and resonant overvoltage, which in turn leads to explosion of lightning arresters, explosion of cable heads, and burning of PTs in existing energy-saving cabinets. This not only brings huge economic losses to the enterprises, but also seriously affects the normal power generation of the system. Utility Model Content

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides a photovoltaic collector circuit energy-saving cabinet.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The first aspect of the utility model provides a photovoltaic collector circuit energy-saving cabinet.

[0008] A photovoltaic collector line energy-saving cabinet comprises: a cabinet body, a first connecting piece passing through a front wall of the cabinet body, a second connecting piece passing through a rear wall of the cabinet body, the first connecting piece connected to one end of a second isolating switch, the other end of the second isolating switch respectively connected to one end of a PT fuse, one end of the first isolating switch and one end of a main circuit contactor, the other end of the main circuit contactor connected to one end of a resistor, the other end of the resistor connected to a first end of a second current transformer, the second end of the second current transformer connected to the first end of the first current transformer, the second end of the first current transformer connected to the second connecting piece, the other end of the PT fuse connected to a voltage transformer, and the other end of the first isolating switch connected to the third end of the second current transformer.

[0009] Furthermore, a box body is provided on the front wall inside the cabinet.

[0010] Furthermore, a controller is provided in the box, and the controller is respectively connected to the voltage transformer, the first current transformer, the second current transformer, the main circuit contactor and the first isolating switch.

[0011] Furthermore, the second isolating switch is also connected to a grid-connected high-voltage circuit breaker.

[0012] Furthermore, the first connecting member is connected to a high-voltage switch cabinet.

[0013] Furthermore, the second connecting member is connected to a photovoltaic step-up transformer.

[0014] Furthermore, a plurality of ventilation windows are provided on the side walls and the front wall of the cabinet, and ventilation holes are provided on the ventilation windows.

[0015] Furthermore, a handle is provided on the ventilation window.

[0016] Furthermore, an electromagnetic lock is provided on the cabinet door.

[0017] Furthermore, a lighting lamp is provided on the side wall of the cabinet.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The photovoltaic power collection line energy-saving cabinet closes in the early morning and opens in the evening. At this time, there is only a weak current in the circuit, or even zero current. The operation has no impact on the circuit and has no effect on power generation. The operation process has been configured with an automatic operation controller, and the closing and opening time points can be selected as needed.

[0020] The photovoltaic collector line energy-saving cabinet has a built-in resistor R1, which serves as an excitation elimination device and can completely eliminate the excitation current generated by the transformer on and off, without any impact on the transformer, the upper switch and the collector line, making it safe and reliable. The photovoltaic collector line energy-saving cabinet has multiple operation modes. Under normal circumstances, the built-in circuit controls the timing of automatic opening and closing. In an emergency, it can also be opened and closed by pressing a button on the spot, which will not affect the safety of the line. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0022] Figure 1 It is a structural diagram of a photovoltaic power collection circuit energy-saving cabinet shown in the utility model;

[0023] Figure 2This is a front view of the photovoltaic power collection circuit energy-saving cabinet shown in the utility model;

[0024] Figure 3 It is a side view of the photovoltaic power collection circuit energy-saving cabinet shown in the utility model;

[0025] Among them, G1, the second isolating switch, DL1, the main circuit contactor, DL2, the first isolating switch, R2, the PT fuse, PT1, the voltage transformer, KZQ, the controller, R1, the resistor, CT2, the second current transformer, and CT1, the first current transformer. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0027] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] Embodiment 1

[0030] like Figure 1 , Figure 2 , Figure 3 As shown, this embodiment provides a photovoltaic collector line energy-saving cabinet, including: a cabinet body, a first connecting piece passing through the front wall of the cabinet body, and a second connecting piece passing through the rear wall of the cabinet body, the first connecting piece is connected to one end of the second isolating switch G1, and the other end of the second isolating switch G1 is respectively connected to one end of the PT fuse R2, one end of the first isolating switch DL2 and one end of the main circuit contactor DL1, the other end of the main circuit contactor DL1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the first end of the second current transformer CT2, the second end of the second current transformer CT2 is connected to the first end of the first current transformer CT1, the second end of the first current transformer CT1 is connected to the second connecting piece, the other end of the PT fuse R2 is connected to the voltage transformer PT1, and the other end of the first isolating switch DL2 is connected to the third end of the second current transformer CT2.

[0031] In some embodiments, a box body is provided on the front wall of the cabinet.

[0032] In some embodiments, a controller KZQ is provided in the box, and the controller KZQ is respectively connected to the voltage transformer PT1, the first current transformer CT1, the second current transformer CT2, the main circuit contactor DL1 and the first isolating switch DL2.

[0033] In some embodiments, the second isolating switch G1 is also connected to a grid-connected high-voltage circuit breaker.

[0034] In some embodiments, the first connecting member is connected to a high-voltage switch cabinet.

[0035] In some embodiments, the second connector is connected to a photovoltaic step-up transformer.

[0036] In some embodiments, a plurality of ventilation windows are provided on the side walls and the front wall of the cabinet, and ventilation holes are provided on the ventilation windows.

[0037] In some embodiments, a handle is also provided on the ventilation window.

[0038] In some embodiments, an electromagnetic lock is provided on the cabinet door.

[0039] In some embodiments, a lighting lamp is also provided on the side wall of the cabinet.

[0040] The energy-saving cabinet system is mainly composed of vacuum contactors, controllers, current transformers, voltage transformers, fuses, disconnectors, resistors and other equipment. Ordinary energy-saving cabinets have no controllers and cannot achieve intelligent control. The closing operation of the energy-saving cabinet is performed in the early morning, and the opening operation is performed in the evening. At this time, there is only a weak current in the circuit, or even zero current. The operation has no impact on the circuit and has no effect on power generation. The operation process has been configured with an automatic operation controller, and the set closing time and opening time can be selected as needed for operation.

[0041] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A photovoltaic collector circuit energy-saving cabinet, characterized in that: include: A cabinet, a first connecting piece passes through the front wall of the cabinet, a second connecting piece passes through the rear wall of the cabinet, the first connecting piece is connected to one end of the second isolating switch, the other end of the second isolating switch is respectively connected to one end of the PT fuse, one end of the first isolating switch and one end of the main circuit contactor, the other end of the main circuit contactor is connected to one end of the resistor, the other end of the resistor is connected to the first end of the second current transformer, the second end of the second current transformer is connected to the first end of the first current transformer, the second end of the first current transformer is connected to the second connecting piece, the other end of the PT fuse is connected to the voltage transformer, and the other end of the first isolating switch is connected to the third end of the second current transformer.

2. The photovoltaic collector circuit energy-saving cabinet according to claim 1, characterized in that: A box body is arranged on the front wall of the cabinet.

3. The photovoltaic power collection circuit energy-saving cabinet according to claim 2, characterized in that: A controller is arranged in the box, and the controller is respectively connected to the voltage transformer, the first current transformer, the second current transformer, the main circuit contactor and the first isolating switch.

4. The photovoltaic power collection circuit energy-saving cabinet according to claim 1, characterized in that: The second isolating switch is also connected to a grid-connected high-voltage circuit breaker.

5. The photovoltaic collector circuit energy-saving cabinet according to claim 1, characterized in that: The first connecting member is connected to the high-voltage switch cabinet.

6. The photovoltaic power collection circuit energy-saving cabinet according to claim 1, characterized in that: The second connecting member is connected to the photovoltaic step-up transformer.

7. The photovoltaic power collection circuit energy-saving cabinet according to claim 1, characterized in that: A plurality of ventilation windows are arranged on the side walls and the front wall of the cabinet, and ventilation holes are arranged on the ventilation windows.

8. The photovoltaic power collection line energy-saving cabinet according to claim 7, characterized in that: A handle is also provided on the ventilation window.

9. The photovoltaic power collection circuit energy-saving cabinet according to claim 1, characterized in that: The cabinet door is equipped with an electromagnetic lock.

10. The photovoltaic power collection line energy-saving cabinet according to claim 1, characterized in that: The side walls of the cabinet are also provided with lighting lamps.

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