Self-checking arc light protection device

Abstract

The utility model relates to the technical field of arc light protection, and particularly discloses a self-checking arc light protection device which comprises an arc light module, an electric signal module, an execution module and a host, the host comprises a data processing module, a display module and a power supply module, and the arc light module and the electric signal module are connected with the data processing module through lines. The data processing module is connected with the display module through a line, the data processing module and the display module are connected with the execution module through lines, and the power supply module is connected with the arc light module, the electric signal module, the data processing module and the display module through lines. Arc light protection takes arc light detection when a fault occurs as a main basis, and a short-circuit fault in the switch cabinet can be rapidly cut off in combination with a fault current criterion; the device realizes channel self-inspection, detects whether the optical fiber of the arc light sensor is damaged, ensures the accuracy of arc light signals, and improves the monitoring reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of arc protection, in particular to an arc protection device capable of self-checking. Background Art

[0002] With the development of distribution networks, the number of medium and low voltage switchgear is increasing. As the carrier of medium and low voltage busbars, due to its small space, when a fault occurs, it is often accompanied by arcing and fire in the cabinet. If the fault cannot be removed in time, the rapid spread of arc light will cause serious economic and property losses. Traditional medium and low voltage switchgear generally has no special protection. When a fault occurs in the cabinet, it mostly relies on the low-voltage side backup protection of the transformer with delay to remove the fault. The delay is long, the equipment is seriously damaged, and the power supply restoration cycle is long;

[0003] Therefore, in view of the technical problems described above, there is an urgent need for a self-checking arc protection device. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects of the above-mentioned technology and provide an arc protection device capable of self-checking.

[0005] In order to solve the above technical problems, the technical solution provided by the utility model is a self-checking arc protection device, comprising:

[0006] Arc module, electrical signal module, execution module and host,

[0007] The host includes a data processing module, a display module, and a power module. The arc module and the electrical signal module are connected to the data processing module through lines, the data processing module and the display module are connected to the execution module through lines, and the power module is connected to the arc module, the electrical signal module, the data processing module, and the display module through lines.

[0008] As an improvement, the arc module includes an arc sensor and an arc collection module, and the arc sensor is connected to the arc collection module via a line.

[0009] As an improvement, the electrical signal module includes a current transformer, a voltage transformer, a first analog-to-digital conversion circuit, a zero-sequence calculation module and a first summary circuit. The current transformer is connected to the first analog-to-digital conversion circuit and the zero-sequence calculation module through a line, the voltage transformer is connected to the first analog-to-digital conversion circuit and the zero-sequence calculation module through a line, the zero-sequence calculation module is connected to the first analog-to-digital conversion circuit through a line, and the first analog-to-digital conversion circuit is connected to the first summary circuit through a line.

[0010] As an improvement, the data processing module includes a logic control judgment circuit and a microprocessor, and the logic control judgment circuit is connected to the microprocessor via a line.

[0011] The advantages of the utility model compared with the prior art are:

[0012] 1. Arc protection is mainly based on arc detection when a fault occurs. Combined with the fault current judgment criteria, it can quickly cut off the short circuit fault in the switch cabinet;

[0013] 2. This device realizes channel self-checking to detect whether the arc sensor optical fiber is damaged, ensures the accuracy of the arc signal, and improves the monitoring reliability;

[0014] 3. The number of arc protection devices can be increased or decreased according to actual conditions. Different schemes can be adopted to achieve protection and maximize the utilization of the device through the information of arc, current and voltage corresponding to different operation modes;

[0015] 4. On the basis of the original arc protection, the three-phase voltage synthetic zero-sequence voltage or external zero-sequence voltage is added as the judgment criterion and the overcurrent and zero-sequence voltage judgment principle, which improves the accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a structural block diagram of a self-checking arc protection device.

[0017] Figure 2 The utility model discloses a structural block diagram of an arc module of an arc protection device capable of self-checking.

[0018] Figure 3 The utility model discloses a structural block diagram of an electric signal module of an arc protection device capable of self-checking.

[0019] Figure 4 The utility model discloses a logic judgment diagram of a main machine of a self-checking arc protection device.

[0020] Figure 5 The utility model is a schematic diagram of the installation position of a self-checking arc protection device.

[0021] Figure 6 The utility model discloses a circuit diagram of a self-checking arc protection device.

[0022] As shown in the figure:

[0023] 100. Arc module, 101. Arc sensor, 102. Arc acquisition module, 103. Signal superposition and processing module, 104. Pulse optical drive circuit, 105. Photoelectric converter, 106. Synchronization circuit, 107. Second analog-to-digital conversion circuit, 108. Second summary circuit, 200. Electrical signal module, 201. Current transformer, 202. Voltage transformer, 203. First analog-to-digital conversion circuit, 204. Zero-sequence calculation module, 205. First summary circuit, 300. Data processing module, 301. Logic control judgment circuit, 302. Microprocessor, 303. Alarm processing module, 400. Display module, 500. Power supply module, 600. Execution module. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Combined with Figure 1-6 , a self-checking arc protection device, comprising:

[0026] Arc module 100, electrical signal module 200, execution module 600 and host,

[0027] The host includes a data processing module 300, a display module 400, and a power module 500. The arc module 100 and the electrical signal module 200 are connected to the data processing module 300 through lines, the data processing module 300 and the display module 400 are connected through lines, the data processing module 300 and the display module 400 are both connected to the execution module 600 through lines, and the power module 500 is connected to the arc module 100, the electrical signal module 200, the data processing module 300, and the display module 400 through lines.

[0028] The arc module 100 includes an arc sensor 101 and an arc collection module 102, and the arc sensor 101 is connected to the arc collection module 102 through a line;

[0029] The arc light acquisition module 102 includes a signal superposition and processing module 103, a pulse optical drive circuit 104, a photoelectric converter 105, a synchronization circuit 106, a second analog-to-digital conversion circuit 107 and a second summary circuit 108. The arc light sensor 101 is connected to the signal superposition and processing module 103 through a line, the signal superposition and processing module 103 is connected to the photoelectric converter 105 and the pulse optical drive circuit 104 through a line, the photoelectric converter 105 is connected to the host, the second analog-to-digital conversion circuit 107 and the synchronization circuit 106 through a line, the synchronization circuit 106 is connected to the pulse optical drive circuit 104 through a line, and the second analog-to-digital conversion circuit 107 is connected to the second summary circuit 108 through a line;

[0030] The arc light acquisition module 102 and the arc light sensor 101 monitor the state of the arc light transmission channel in real time. It sends pulse light with modulated amplitude and pulse width through the pulse light drive circuit 104 and superimposes it in the transmission channel through the signal superposition and processing module 103. Then, the arc light sensor 101 detects the reflected pulse light signal, thereby realizing the monitoring of the channel state.

[0031] The arc light acquisition module 102 is responsible for collecting real-time data and recording the data location, and sending the arc light data and location information converted by the photoelectric converter 105 to the alarm judgment unit data processing module 300 of the host; at the same time, these data are converted and summarized by the second analog-to-digital conversion circuit 107 and the second summary circuit 108, and sent to the host logic judgment unit data processing module 300.

[0032] The electrical signal module 200 includes a current transformer 201, a voltage transformer 202, a first analog-to-digital conversion circuit 203, a zero-sequence calculation module 204 and a first summary circuit 205, wherein the current transformer 201 is connected to the first analog-to-digital conversion circuit 203 and the zero-sequence calculation module 204 through a line, the voltage transformer 202 is connected to the first analog-to-digital conversion circuit 203 and the zero-sequence calculation module 204 through a line, the zero-sequence calculation module 204 is connected to the first analog-to-digital conversion circuit 203 through a line, and the first analog-to-digital conversion circuit 203 is connected to the first summary circuit 205 through a line;

[0033] The electrical signal module 200 collects three-phase current signals and three-phase voltage signals through the current transformer 201 and the voltage transformer 202, and sends the collected results to the zero-sequence calculation module 204 to obtain the zero-sequence voltage. The calculated zero-sequence voltage and the three-phase voltage and current signals are then converted into digital signals through the first analog-to-digital conversion circuit 203, and finally aggregated into a signal through the first aggregation circuit 205, and the position information is recorded and sent together to the logic judgment unit data processing module 300 of the host;

[0034] The data processing module 300 includes a logic control judgment circuit 301 and a microprocessor 302, wherein the logic control judgment circuit 301 is connected to the microprocessor 302 via a line; the data processing module 300 also includes an alarm processing module 303;

[0035] The logic control judgment circuit 301 of the host unit judges the summary signal of the arc module 100 and the summary signal of the electrical signal module 200, and the alarm processing receives the data from the arc acquisition module 102 and performs real-time analysis; the alarm processing module 303 compares the received pulse light with the preset pulse light characteristic parameters to determine whether the arc transmission channel is in a good state; if the channel is intact, the result of the logic judgment circuit 301 is adopted, and if the channel is abnormal, an alarm is issued; the microprocessor 302 first determines whether there is a channel alarm information, and if there is a channel alarm information, the location of the faulty channel is displayed through the display module 400, and if the channel is intact, it is judged whether there is an arc fault, and when it is judged that an arc fault has occurred, the execution module 600 is used to control the circuit breaker of the switch cabinet to trip and issue an arc fault alarm information; the display module 400 displays the alarm information and location issued by the microprocessor 302;

[0036] The display module 400 is a liquid crystal screen.

[0037] When the utility model is implemented,

[0038] Installation method:

[0039] The arc sensor 101 is installed at any position of the switch cabinet, and protects the partition according to its actual position; one arc light acquisition module 102 can be connected to multiple arc light sensors 101, and one host can be connected to multiple arc light acquisition modules 102, which can realize the full range of light signal acquisition inside the switch cabinet; the current transformer 201 and the voltage transformer 202 are installed in the incoming power switch cabinet, and the current information of the power point can be collected on-site while realizing the system tripping nearby; the installation position of the arc light sensor 101 corresponds to the current and voltage signals flowing through the position;

[0040] Detection principle:

[0041] The arc module 100 is composed of an arc sensor 101 and an arc acquisition module 102. The arc acquisition module 102 and the arc sensor 101 are used to monitor the state of the arc transmission channel in real time. The pulse light drive circuit 104 sends pulse light with modulated amplitude and pulse width, and the pulse light is superimposed in the transmission channel through the signal superposition and processing module 103. Then, the arc sensor 101 detects the reflected pulse light signal, thereby realizing the monitoring of the channel state.

[0042] The arc light acquisition module 102 is responsible for collecting real-time data and recording the data location, and sending the arc light data and location information converted by the photoelectric converter 105 to the alarm judgment unit data processing module 300 of the host; at the same time, these data are converted and summarized by the second analog-to-digital conversion circuit 107 and the second summary circuit 108, and sent to the host logic judgment unit data processing module 300;

[0043] The electrical signal module 200 collects three-phase current signals and three-phase voltage signals through the current transformer 201 and the voltage transformer 202, and sends the collected results to the zero-sequence calculation module 204 to obtain the zero-sequence voltage. The calculated zero-sequence voltage and the three-phase voltage and current signals are then converted into digital signals through the first analog-to-digital conversion circuit 203, and finally aggregated into a signal through the first aggregation circuit 205, and the position information is recorded and sent together to the logic judgment unit data processing module 300 of the host;

[0044] The logic control judgment circuit 301 of the host unit judges the summary signal of the arc module 100 and the summary signal of the electrical signal module 200, and the alarm processing receives the data from the arc acquisition module 102 and performs real-time analysis; the alarm processing module 303 compares the received pulse light with the preset pulse light characteristic parameters to determine whether the arc transmission channel is in a good state; if the channel is intact, the result of the logic judgment circuit 301 is adopted, and if the channel is abnormal, an alarm is issued; the microprocessor 302 first determines whether there is a channel alarm information, and if there is a channel alarm information, the location of the faulty channel is displayed through the display module 400, and if the channel is intact, it is judged whether there is an arc fault, and when it is judged that an arc fault has occurred, the execution module 600 is used to control the circuit breaker of the switch cabinet to trip and issue an arc fault alarm information; the display module 400 displays the alarm information and location issued by the microprocessor 302;

[0045] The device is powered by 220V AC power. The arc module 100 and the electrical signal module 200 upload the action status and address information of the sensors near the fault point to the host. If the wiring method is single-mother segmentation, the two hosts can be interconnected. If it is determined that an arc fault occurs on one side, the host on the faulty side will send a signal to disconnect the circuit breaker on the mother bus. The host can also perform self-inspection on the entire arc protection system. If there is a problem with an arc transmission channel, the host will send a corresponding arc channel alarm signal.

[0046] In the description of the embodiments of the present utility model, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0047] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0048] In the description of the embodiments of the present invention, "multiple" means at least 2.

[0049] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0050] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A self-checking arc protection device, characterized in that: include: An arc module (100), an electrical signal module (200), an execution module (600) and a host, The host comprises a data processing module (300), a display module (400), and a power module (500); the arc module (100) and the electric signal module (200) are connected to the data processing module (300) via a line; the data processing module (300) and the display module (400) are connected via a line; the data processing module (300) and the display module (400) are both connected to an execution module (600) via a line; and the power module (500) is connected to the arc module (100), the electric signal module (200), the data processing module (300), and the display module (400) via a line.

2. A self-checking arc protection device according to claim 1, characterized in that: The arc module (100) comprises an arc sensor (101) and an arc collection module (102); the arc sensor (101) is connected to the arc collection module (102) via a line.

3. A self-checking arc protection device according to claim 2, characterized in that: The electrical signal module (200) comprises a current transformer (201), a voltage transformer (202), a first analog-to-digital conversion circuit (203), a zero-sequence calculation module (204) and a first summary circuit (205); the current transformer (201) is connected to the first analog-to-digital conversion circuit (203) and the zero-sequence calculation module (204) via a line; the voltage transformer (202) is connected to the first analog-to-digital conversion circuit (203) and the zero-sequence calculation module (204) via a line; the zero-sequence calculation module (204) is connected to the first analog-to-digital conversion circuit (203) via a line; and the first analog-to-digital conversion circuit (203) is connected to the first summary circuit (205) via a line.

4. The self-checking arc protection device according to claim 1, characterized in that: The data processing module (300) comprises a logic control judgment circuit (301) and a microprocessor (302), and the logic control judgment circuit (301) is connected to the microprocessor (302) via a line.

5. The self-checking arc protection device according to claim 1, characterized in that: The display module (400) is a liquid crystal screen.

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