Reliable switching-on and switching-off switch equipment

Abstract

The utility model belongs to the technical field of electric power and electric appliances, and discloses reliable closing and opening switch equipment, which comprises a controller, an A-phase Spark module, a B-phase Spark module, a C-phase Spark module, a first circuit breaker, a second circuit breaker, a third circuit breaker, a first nonlinear resistor, a second nonlinear resistor, a third nonlinear resistor and a cabinet body, an A-phase Spark module and a first nonlinear resistor are connected in parallel in a first circuit breaker, a B-phase Spark module and a second nonlinear resistor are connected in parallel in a second circuit breaker, and a C-phase Spark module and a third nonlinear resistor are connected in parallel in a third circuit breaker. And the A-phase Spark module, the B-phase Spark module and the C-phase Spark module are controlled through the controller, so that inrush current suppression during switching on is realized. Meanwhile, through a first nonlinear resistor, a second nonlinear resistor and a third nonlinear resistor, energy absorption during opening is realized. And the reliability of the whole switching-on and switching-off switch equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of power electrical technology, and in particular to a reliable closing and opening switchgear. Background Technology

[0002] When large transformers and parallel reactors in substations are closed under no-load conditions, they are prone to generating huge inrush currents, which are usually 6 to 8 times the rated current, and in severe cases can reach more than 10 times. They also contain a large number of high-order harmonics, and the decay time is related to the winding impedance, ranging from several power frequency cycles to several seconds, accompanied by obvious low-frequency vibrations and sounds.

[0003] A massive inrush current can reduce the mechanical strength of a transformer, decrease its short-circuit withstand capability, cause relay protection malfunctions, cause voltage dips in the line, cause frequent changes in the inverter commutation angle leading to DC commutation failure or power fluctuations, cause AC filter surge arresters to operate or be damaged, and cause a massive inrush current generated when a transformer in a dense DC transmission area is closed under no-load conditions, resulting in bus voltage distortion and commutation failure, thus affecting the safe operation of the system.

[0004] Currently, a phase-selective closing device (phase-selective closing controller) is usually installed on the transformer incoming circuit breaker to reduce the inrush current generated by the transformer's no-load closing. However, extensive application has shown that due to the residual magnetism of the transformer, the large dispersion of the mechanical characteristics of the circuit breaker, and the randomness of the closing pre-discharge, the phase-selective closing function is not fully utilized, resulting in a large inrush current still being generated when the transformer is closed under no-load conditions.

[0005] Existing closing and opening switchgear is prone to generating huge inrush currents and overvoltages when handling capacitive or inductive loads, thus jeopardizing the safe operation of the power grid. Therefore, improving the reliability of closing and opening switchgear is a technical problem that urgently needs to be studied in the industry. Utility Model Content

[0006] The purpose of this utility model is to provide a reliable closing and opening switchgear to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0007] The solution to the technical problem of this utility model is: to provide a reliable closing and opening switchgear, including: a controller, an A-phase Spark module, a B-phase Spark module, a C-phase Spark module, a first circuit breaker, a second circuit breaker, a third circuit breaker, a first nonlinear resistor, a second nonlinear resistor, a third nonlinear resistor, and a cabinet;

[0008] The controller, A-phase Spark module, B-phase Spark module, C-phase Spark module, first circuit breaker, second circuit breaker, third circuit breaker, first nonlinear resistor, second nonlinear resistor and third nonlinear resistor are all installed in the cabinet;

[0009] The controller is connected to the control terminals of the A-phase Spark module, the B-phase Spark module, and the C-phase Spark module, respectively.

[0010] One end of the switch side of the A-phase Spark module is connected to one end of the first circuit breaker and one end of the first nonlinear resistor, respectively; the other end of the switch side of the A-phase Spark module is connected to the other end of the first circuit breaker and the other end of the first nonlinear resistor, respectively.

[0011] One end of the switch side of the B-phase Spark module is connected to one end of the second circuit breaker and one end of the second nonlinear resistor, and the other end of the switch side of the B-phase Spark module is connected to the other end of the second circuit breaker and the other end of the second nonlinear resistor.

[0012] One end of the switch side of the C-phase Spark module is connected to one end of the third circuit breaker and one end of the third nonlinear resistor, respectively; the other end of the switch side of the C-phase Spark module is connected to the other end of the third circuit breaker and the other end of the third nonlinear resistor, respectively.

[0013] The controller is configured to: control the switching side of the A-phase Spark module to conduct during the nearest zero-crossing time before the first circuit breaker closes, and control the switching side of the A-phase Spark module to disconnect after the first circuit breaker closes.

[0014] Within the nearest zero-crossing time before the second circuit breaker closes, the switch side of the B-phase Spark module is controlled to be turned on, and the switch side of the B-phase Spark module is controlled to be turned off after the second circuit breaker closes.

[0015] Before the third circuit breaker closes, the switch side of the C-phase Spark module is controlled to be turned on during the nearest zero-crossing time, and after the third circuit breaker closes, the switch side of the C-phase Spark module is controlled to be turned off.

[0016] Furthermore, the reliable closing and opening switchgear also includes a first copper busbar interface and a second copper busbar interface. The first copper busbar interface is connected to one end of the first circuit breaker, and the second copper busbar interface is connected to the other end of the second circuit breaker. The first copper busbar interface is used to connect to a portion of the external A-phase line, and the second copper busbar interface is used to connect to the other portion of the external A-phase line.

[0017] Furthermore, the reliable closing and opening switchgear also includes a third copper busbar interface and a fourth copper busbar interface. The third copper busbar interface is connected to one end of the second circuit breaker, and the fourth copper busbar interface is connected to the other end of the second circuit breaker. The third copper busbar interface is used to connect to a portion of the external B-phase line, and the fourth copper busbar interface is used to connect to the other portion of the external B-phase line.

[0018] Furthermore, the reliable closing and opening switchgear also includes a fifth copper busbar interface and a sixth copper busbar interface. The fifth copper busbar interface is connected to one end of the third circuit breaker, and the sixth copper busbar interface is connected to the other end of the third circuit breaker. The fifth copper busbar interface is used to connect to a portion of the external C-phase line, and the sixth copper busbar interface is used to connect to another portion of the external C-phase line.

[0019] Furthermore, the controller is connected to the control terminal of the A-phase Spark module via a first optical fiber.

[0020] Furthermore, the controller is connected to the control terminal of the B-phase Spark module via a second optical fiber.

[0021] Furthermore, the controller is connected to the control terminal of the C-phase Spark module via a third optical fiber.

[0022] Furthermore, the first circuit breaker is an SF6 circuit breaker.

[0023] Furthermore, the second circuit breaker is an SF6 circuit breaker.

[0024] Furthermore, the third circuit breaker is an SF6 circuit breaker.

[0025] The beneficial effects of this invention are as follows: By connecting an A-phase Spark module and a first nonlinear resistor in parallel in the first circuit breaker, a B-phase Spark module and a second nonlinear resistor in parallel in the second circuit breaker, and a C-phase Spark module and a third nonlinear resistor in parallel in the third circuit breaker, and controlling the A-phase, B-phase, and C-phase Spark modules through a controller, inrush current is suppressed during closing. Simultaneously, the first, second, and third nonlinear resistors absorb energy during opening, thus improving the reliability of the entire closing and opening switchgear. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the internal structure of a reliable closing and opening switchgear in phase A.

[0028] Figure 2 This is a schematic diagram of the system connection structure between the controller and the Spark modules of each phase;

[0029] Figure 3 This is a schematic diagram of the electrical connections for the A-phase Spark module. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0031] It should be noted that although functional modules are divided in the system diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the system or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0032] refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the internal structure of a reliable closing and opening switchgear. Figure 2 This is a schematic diagram of the system connection structure between the controller and the Spark modules of each phase. Figure 3 This is a schematic diagram of the electrical connections for the A-phase Spark module.

[0033] The main purpose of this application is to solve the technical problem that inrush current and overvoltage exist in the existing closing and opening switchgear during the closing and opening process, resulting in poor closing and opening performance.

[0034] For this purpose, this application provides a reliable closing and opening switchgear, comprising: a controller 300, an A-phase Spark module 210, a B-phase Spark module 310, a C-phase Spark module 410, a first circuit breaker 230, a second circuit breaker, a third circuit breaker, a first nonlinear resistor 220, a second nonlinear resistor, a third nonlinear resistor, and a cabinet 100.

[0035] The cabinet 100 is internally equipped with multiple crossbeams, through which the controller 300, A-phase Spark module 210, B-phase Spark module 310, C-phase Spark module 410, first circuit breaker 230, second circuit breaker, third circuit breaker, first nonlinear resistor 220, second nonlinear resistor, and third nonlinear resistor are mounted. Specifically, the first nonlinear resistor 220, the second nonlinear resistor, and the third nonlinear resistor are all high-energy zinc oxide nonlinear resistors.

[0036] The controller 300 is connected to the control terminals of the A-phase Spark module 210, B-phase Spark module 310, and C-phase Spark module 410 via communication lines. To enable faster communication between the controller 300 and these modules, in some further embodiments, the controller 300 is connected to the control terminals of these modules via optical fibers. Specifically, the controller 300 communicates with the A-phase Spark module 210 via a first optical fiber 301, with the B-phase Spark module 310 via a second optical fiber 302, and with the C-phase Spark module 410 via a third optical fiber 303.

[0037] To enable the A-phase Spark module 210 to suppress inrush current during phase A closing, the A-phase Spark module 210 is connected in parallel with the first circuit breaker 230. Specifically, one end of the switch side of the A-phase Spark module 210 is connected to one end of the first circuit breaker 230, and the other end of the switch side of the A-phase Spark module 210 is connected to the other end of the first circuit breaker 230. The first circuit breaker 230 is mainly connected to the external phase A line, thereby closing and opening the external phase A line.

[0038] To enable the B-phase Spark module 310 to suppress inrush current during B-phase closing, it is connected in parallel with the second circuit breaker. Specifically, one end of the switch side of the B-phase Spark module 310 is connected to one end of the second circuit breaker, and the other end of the switch side of the B-phase Spark module 310 is connected to the other end of the second circuit breaker. The second circuit breaker is primarily connected to the external B-phase line, thereby enabling the closing and opening of the external B-phase line.

[0039] To enable the C-phase Spark module 410 to suppress inrush current during C-phase closing, it is connected in parallel with the third circuit breaker. Specifically, one end of the switch side of the C-phase Spark module 410 is connected to one end of the third circuit breaker, and the other end of the switch side of the C-phase Spark module 410 is connected to the other end of the third circuit breaker. The third circuit breaker is mainly connected to the external C-phase line, thereby controlling the closing and opening of the external C-phase line.

[0040] When it is necessary to close phase A via the first circuit breaker 230, the controller 300 acquires the phase information of phase A through the corresponding sensor, and controls the switching side of phase A Spark module 210 to conduct during the zero-crossing time before the first circuit breaker 230 closes. After the first circuit breaker 230 closes, it controls the switching side of phase A Spark module 210 to disconnect. Phase A Spark module 210 will conduct within 10μs. After phase A Spark module 210 conducts, the first circuit breaker 230 can close. Because phase A Spark module 210 has been closed beforehand, no surge will occur when the first circuit breaker 230 closes.

[0041] Similarly, when the second circuit breaker needs to close the B-phase line, the controller 300 obtains the phase information of the B-phase line through the corresponding sensor, and controls the switching side of the B-phase Spark module 310 to conduct during the zero-crossing time before the second circuit breaker closes. After the second circuit breaker closes, the controller controls the switching side of the B-phase Spark module 310 to disconnect. The B-phase Spark module 310 will conduct within 10μs. After the B-phase Spark module 310 conducts, the second circuit breaker can close. Because the B-phase Spark module 310 has been closed beforehand, no surge will be generated when the second circuit breaker closes.

[0042] Similarly, when the third circuit breaker needs to close the C-phase line, the controller 300 obtains the phase information of the C-phase line through the corresponding sensor, and controls the switching side of the C-phase Spark module 410 to conduct during the zero-crossing time before the third circuit breaker closes. After the third circuit breaker closes, it controls the switching side of the C-phase Spark module 410 to disconnect. The C-phase Spark module 410 will conduct within 10μs. After the C-phase Spark module 410 conducts, the third circuit breaker can close. Because the C-phase Spark module 410 has been closed beforehand, no surge will be generated when the third circuit breaker closes.

[0043] To ensure that phase A absorbs the breaking energy of the first circuit breaker 230 during tripping and prevent overvoltage issues caused by the first circuit breaker 230 reigniting, the first circuit breaker 230 is connected in parallel with the first nonlinear resistor 220. Specifically, one end of the first nonlinear resistor 220 is connected to one end of the first circuit breaker 230, and the other end of the first nonlinear resistor 220 is connected to the other end of the first circuit breaker 230.

[0044] Similarly, in order to ensure that phase B absorbs the breaking energy of the second circuit breaker when it trips, thus preventing overvoltage issues caused by the second circuit breaker reigniting, the second circuit breaker is connected in parallel with the second nonlinear resistor. Specifically, one end of the second nonlinear resistor is connected to one end of the second circuit breaker, and the other end of the second nonlinear resistor is connected to the other end of the second circuit breaker.

[0045] Similarly, in order to ensure that the C-phase line absorbs the breaking energy of the third circuit breaker during tripping and to prevent the third circuit breaker from reigniting due to overvoltage, the third circuit breaker is connected in parallel with the third nonlinear resistor. Specifically, one end of the third nonlinear resistor is connected to one end of the third circuit breaker, and the other end of the third nonlinear resistor is connected to the other end of the third circuit breaker.

[0046] This invention utilizes parallel connections of a phase A Spark module 210 and a first nonlinear resistor 220 in a first circuit breaker 230, a phase B Spark module 310 and a second nonlinear resistor in a second circuit breaker, and a phase C Spark module 410 and a third nonlinear resistor in a third circuit breaker. A controller 300 controls the phase A Spark module 210, phase B Spark module 310, and phase C Spark module 410 to suppress inrush current during closing. Simultaneously, the first, second, and third nonlinear resistors absorb energy during opening.

[0047] To facilitate better connection of the external A-phase line to the first circuit breaker 230, in some further embodiments, the reliable closing and opening switching device also includes a first copper busbar interface 110 and a second copper busbar interface 120. The first copper busbar interface 110 is connected to one end of the first circuit breaker 230, and the second copper busbar interface 120 is connected to the other end of the first circuit breaker 230.

[0048] When an external phase A conductor needs to be connected to the first circuit breaker 230, a portion of the external phase A conductor can be connected to the first copper busbar interface 110, where a specific bolt is used to tighten the portion of the phase A conductor. The other portion of the external phase A conductor can then be connected to the second copper busbar interface 120, where a specific bolt is used to tighten the other portion of the phase A conductor. The first circuit breaker 230 closes the circuit to conduct phase A conductors and opens the circuit to disconnect phase A conductors.

[0049] To facilitate better connection of the external B-phase line to the second circuit breaker, in some further embodiments, the reliable closing and opening switching device also includes a third copper busbar interface and a fourth copper busbar interface. The third copper busbar interface is connected to one end of the second circuit breaker, and the fourth copper busbar interface is connected to the other end of the second circuit breaker.

[0050] When an external phase B line needs to be connected to the second circuit breaker, a portion of the external phase B line can be connected to the third copper busbar interface, where a portion of the phase B line is tightened using specific bolts. The other portion of the external phase B line can then be connected to the fourth copper busbar interface, where the other portion of the phase B line is tightened using specific bolts. The second circuit breaker closes to conduct the phase B line, and opens to disconnect the phase B line.

[0051] To facilitate better connection of the external C-phase line to the third circuit breaker, in some further embodiments, the reliable closing and opening switching device also includes a fifth copper busbar interface and a sixth copper busbar interface. The fifth copper busbar interface is connected to one end of the third circuit breaker, and the sixth copper busbar interface is connected to the other end of the third circuit breaker.

[0052] When an external C-phase line needs to be connected to the third circuit breaker, a portion of the external C-phase line can be connected to the fifth copper busbar interface, where a specific bolt is used to tighten that portion of the C-phase line. The other portion of the external C-phase line can then be connected to the sixth copper busbar interface, where a specific bolt is used to tighten that other portion of the C-phase line. The third circuit breaker closes to conduct the C-phase line, and opens to disconnect it.

[0053] To improve the reliability of the first circuit breaker 230, in some further embodiments, the first circuit breaker 230 is an SF6 circuit breaker. To improve the reliability of the second circuit breaker, in some further embodiments, the second circuit breaker is an SF6 circuit breaker. To improve the reliability of the third circuit breaker, in some further embodiments, the third circuit breaker is an SF6 circuit breaker.

[0054] Among them, the SF6 circuit breaker (sulfur hexafluoride circuit breaker) is a high-voltage circuit breaker that uses sulfur hexafluoride (SF6) gas as the arc-extinguishing and insulating medium, and has excellent insulation and arc-extinguishing performance.

[0055] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A reliable closing and opening switchgear, characterized in that, include: The system includes a controller, an A-phase Spark module, a B-phase Spark module, a C-phase Spark module, a first circuit breaker, a second circuit breaker, a third circuit breaker, a first nonlinear resistor, a second nonlinear resistor, a third nonlinear resistor, and a cabinet. The controller, A-phase Spark module, B-phase Spark module, C-phase Spark module, first circuit breaker, second circuit breaker, third circuit breaker, first nonlinear resistor, second nonlinear resistor and third nonlinear resistor are all installed in the cabinet; The controller is connected to the control terminals of the A-phase Spark module, the B-phase Spark module, and the C-phase Spark module, respectively. One end of the switch side of the A-phase Spark module is connected to one end of the first circuit breaker and one end of the first nonlinear resistor, respectively; the other end of the switch side of the A-phase Spark module is connected to the other end of the first circuit breaker and the other end of the first nonlinear resistor, respectively. One end of the switch side of the B-phase Spark module is connected to one end of the second circuit breaker and one end of the second nonlinear resistor, and the other end of the switch side of the B-phase Spark module is connected to the other end of the second circuit breaker and the other end of the second nonlinear resistor. One end of the switch side of the C-phase Spark module is connected to one end of the third circuit breaker and one end of the third nonlinear resistor, respectively; the other end of the switch side of the C-phase Spark module is connected to the other end of the third circuit breaker and the other end of the third nonlinear resistor, respectively. The controller is configured to: control the switching side of the A-phase Spark module to conduct during the nearest zero-crossing time before the first circuit breaker closes, and control the switching side of the A-phase Spark module to disconnect after the first circuit breaker closes. Within the nearest zero-crossing time before the second circuit breaker closes, the switch side of the B-phase Spark module is controlled to be turned on, and the switch side of the B-phase Spark module is controlled to be turned off after the second circuit breaker closes. Before the third circuit breaker closes, the switch side of the C-phase Spark module is controlled to be turned on during the nearest zero-crossing time, and after the third circuit breaker closes, the switch side of the C-phase Spark module is controlled to be turned off.

2. The reliable closing and opening switchgear according to claim 1, characterized in that, It also includes a first copper busbar interface and a second copper busbar interface. The first copper busbar interface is connected to one end of the first circuit breaker, and the second copper busbar interface is connected to the other end of the second circuit breaker. The first copper busbar interface is used to connect to a portion of the external A-phase line, and the second copper busbar interface is used to connect to the other portion of the external A-phase line.

3. The reliable closing and opening switchgear according to claim 1, characterized in that, It also includes a third copper busbar interface and a fourth copper busbar interface. The third copper busbar interface is connected to one end of the second circuit breaker, and the fourth copper busbar interface is connected to the other end of the second circuit breaker. The third copper busbar interface is used to connect to a portion of the external B-phase line, and the fourth copper busbar interface is used to connect to the other portion of the external B-phase line.

4. A reliable closing and opening switchgear according to claim 1, characterized in that, It also includes a fifth copper busbar interface and a sixth copper busbar interface. The fifth copper busbar interface is connected to one end of the third circuit breaker, and the sixth copper busbar interface is connected to the other end of the third circuit breaker. The fifth copper busbar interface is used to connect to a portion of the external C-phase line, and the sixth copper busbar interface is used to connect to another portion of the external C-phase line.

5. A reliable closing and opening switchgear according to claim 1, characterized in that, The controller is connected to the control terminal of the A-phase Spark module via a first optical fiber.

6. A reliable closing and opening switchgear according to claim 1, characterized in that, The controller is connected to the control terminal of the B-phase Spark module via a second optical fiber.

7. A reliable closing and opening switchgear according to claim 1, characterized in that, The controller is connected to the control terminal of the C-phase Spark module via a third optical fiber.

8. A reliable closing and opening switchgear according to claim 1, characterized in that, The first circuit breaker is an SF6 circuit breaker.

9. A reliable closing and opening switchgear according to claim 1, characterized in that, The second circuit breaker is an SF6 circuit breaker.

10. A reliable closing and opening switchgear according to claim 1, characterized in that, The third circuit breaker is an SF6 circuit breaker.

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