High-voltage discharge protection device, low-voltage equipment and detection robot

Abstract

The invention discloses a high-voltage discharge protection device, low-voltage equipment and a detection robot, the protection device is used in the low-voltage equipment in a high-voltage environment, and the protection device comprises an arc striking body and at least one inductor; the arc striking body is located between a high-voltage body in a high-voltage environment and a metal shell of low-voltage equipment, and the inductor is electrically connected with the arc striking body and the inductor, so that the arc striking body, the inductor and the metal shell form a discharge object of the high-voltage body. The arc striking body can guide the discharge of the high-voltage body so as to generate high-frequency electromagnetic radiation on the arc striking body, and then the high-frequency electromagnetic radiation is filtered by using the inductive electricity, so that the high-frequency electromagnetic radiation can only act on the metal shell of the low-voltage equipment after being filtered, and finally, the voltage acting on the metal shell is slowly changed; therefore, transient voltage change cannot be generated on the metal shell, secondary electromagnetic radiation is avoided, a circuit in the low-voltage equipment is effectively protected, and normal operation of a low-voltage circuit in the metal shell is ensured.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a high-voltage discharge protection device, a low-voltage device, and a detection robot. Background Art

[0002] During the operation of some low-voltage electronic equipment on high-voltage power lines or in high-voltage environments, they will face high-frequency electromagnetic field interference generated by high-voltage electric fields and high-voltage discharge sparks.

[0003] At present, by using metal conductors to wrap the circuit part of low-voltage equipment and connecting the common electrode of the circuit part to the metal shell, if the conductivity of the metal shell is good enough, the electromagnetic field generated by the external high voltage can be shielded to achieve equipotential electromagnetic protection of the low-voltage circuit.

[0004] However, due to the large transient current of the discharge, when the current flows to different parts of the metal shell, there is resistance on the metal shell, so in the transient state, the metal shell is not at the same potential, so the equipotential electromagnetic protection loses a certain effect; in addition, when the transient voltage of the metal object changes, it will generate secondary electromagnetic radiation to the outside, so the metal shell will also generate secondary electromagnetic radiation, thereby interfering with the low-voltage circuit inside the metal shell. As a result, the above-mentioned high-voltage discharge protection measures will still cause discharge when the distance between the metal shell and the high-voltage part is close, or the insulation strength between the two is insufficient, and when the discharge is serious to a certain extent, the low-voltage circuit inside the metal shell will be fatally interfered and go wrong. Summary of the invention

[0005] The purpose of the present invention is to provide a high-voltage discharge protection device, a low-voltage device, and a detection robot to effectively suppress the electromagnetic interference of a high-voltage line or a high-voltage body on a low-voltage circuit in a low-voltage device.

[0006] To achieve the above object, the present invention provides the following solutions: In a first aspect, the present invention provides a high-voltage discharge protection device, characterized in that the protection device is used in a low-voltage electrical device under a high-voltage environment, and the protection device comprises: An arc starter and at least one inductor; The inductor is electrically connected to the metal shell of the low-voltage electrical device and the arc-starting body respectively, the arc-starting body is located between the high-voltage body in the high-voltage environment and the metal shell of the low-voltage device, and the inductor is electrically connected to the arc-starting body and the inductor respectively, so that the arc-starting body, the inductor and the metal shell form the discharge object of the high-voltage body; The arc starter is used to guide the high voltage body to discharge and generate high-frequency electromagnetic radiation, and the inductor is used to filter the high-frequency electromagnetic radiation to suppress the electromagnetic interference of the high voltage body on the low voltage circuit in the low voltage equipment.

[0007] Optionally, in the high-voltage discharge protection device provided in the present application, the arc starting body is arranged around the metal shell of the low-voltage equipment, and the arc starting body and the metal shell are isolated from each other by an insulating material.

[0008] Optionally, in the high-voltage discharge protection device provided by the present application, the arc starting body is an arc starting wire.

[0009] Optionally, in the high-voltage discharge protection device provided in the present application, a first inductor and a second inductor are arranged between the metal shell and the arc starting body, and the first inductor and the second inductor are connected in series.

[0010] Optionally, in the high-voltage discharge protection device provided in the present application, the first inductor is a low-frequency inductor, and the second inductor is a high-frequency inductor.

[0011] In a second aspect, the present application provides a low voltage device, which is used in a high voltage environment, and is equipped with a high voltage discharge protection device as described in the first aspect.

[0012] In a third aspect, the present application provides a high-voltage insulator inspection robot, which includes a robot body and a zero-value detection device, wherein the zero-value detection device is provided with a detection and control device, and the detection and control device is arranged in a metal shell, and a high-voltage discharge protection device as described in the first aspect is arranged outside the metal shell.

[0013] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: It can be understood that the high-voltage discharge protection device, low-voltage equipment, and detection robot provided by the present application are provided with an arc-starting body and an inductor between the high-voltage body and the metal casing of the low-voltage equipment under a high-voltage environment, and the inductor is electrically connected to the arc-starting body and the inductor respectively, so that the arc-starting body, the inductor, and the metal casing form a discharge object of the high-voltage body, so that in actual operation, that is, when the high-voltage body discharges, the arc-starting body can guide the discharge of the high-voltage body to itself to generate high-frequency electromagnetic radiation, and then use the inductor to filter the high-frequency electromagnetic radiation to ensure that it can act on the metal casing of the low-voltage equipment only after filtering, and finally make the voltage acting on the metal casing change slowly, that is, no transient voltage change can be generated on the metal casing, and there is no secondary electromagnetic radiation, avoiding the phenomenon of discharge when the distance between the metal casing and the high-voltage part is close, or the insulation strength between the two is insufficient, effectively protecting the circuit in the low-voltage equipment and ensuring the normal operation of the low-voltage circuit inside the metal casing; at the same time, due to the high-frequency blocking characteristics of the inductor, the spark intensity of the high-voltage body discharge is also significantly suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a structural schematic diagram of a high voltage discharge protection device in the related art; Figure 2 A schematic diagram of the structure of a high-voltage discharge protection device in some embodiments of the present application; Figure 3 This is a schematic diagram of the structure of an ultra-high voltage insulator zero value detection robot and a high-voltage line insulator according to some embodiments of the present application; Figure 4 This is a schematic structural diagram of the low-voltage equipment of the ultra-high voltage insulator zero-value detection robot according to some other embodiments of the present application.

[0016] Description of reference numerals: 1-high voltage body, 11-discharge arc, 2-low voltage equipment, 21-metal casing, 22-low voltage circuit, 23-low voltage circuit grounding terminal, 3-arc starting body, 31-arc starting wire, 4-inductor, 41-first inductor, 42-second inductor, 5-insulator, 6-zero value detection robot, 7-zero value detection device, 8-detection and control device. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] It can be understood that low-voltage electronic equipment parts running on high-voltage power lines or in high-voltage environments face the problem of preventing interference from high-frequency electromagnetic fields generated by high-voltage electric fields and high-voltage discharge sparks.

[0020] like Figure 1 As shown, the solution in the related art is to wrap the circuit part with a metal conductor and connect the common electrode of the circuit part (generally called the circuit ground) to the outer casing; as long as the conductivity of the metal outer casing is good enough, the external electromagnetic field will not affect the circuit, thus achieving equipotential electromagnetic protection for the low-voltage circuit.

[0021] As for the above technology, since the transient current during discharge is often very large, when the current flows to different parts of the metal shell, there is resistance on the shell, so in the transient state, the shell is not equal in potential, so the equipotential electromagnetic protection loses a certain effect. In addition, when the transient voltage of the metal object changes, it will generate secondary electromagnetic radiation to the outside, so the metal shell will also generate secondary electromagnetic radiation, thereby interfering with the low-voltage circuit inside the shell.

[0022] That is, when the distance between the metal casing and the high-voltage part is close, or the insulation strength between the two is insufficient, discharge will occur. When the discharge is severe to a certain extent, the low-voltage circuit inside the metal casing will be fatally interfered and go wrong.

[0023] In the present application, in order to avoid the problem of ineffectiveness of the above-mentioned protection device caused by the close distance between the metal casing and the high-voltage body, a new high-voltage discharge protection device is provided, that is, by adding an arc starter and an inductor, so as to fully interfere with the low-voltage circuit with high-voltage discharge or discharge sparks.

[0024] Figure 2 Shown is a schematic structural diagram of a high-voltage discharge protection device according to an embodiment of the present application, which is used for low-voltage equipment in a high-voltage environment.

[0025] The high voltage environment may include a high voltage body 1 , such as a high voltage line, etc. The low voltage device 2 may include a metal housing 21 and a low voltage circuit 22 .

[0026] like Figure 2 As shown, the device comprises: An arc starter 3 and at least one inductor 4.

[0027] The inductor 4 is electrically connected to the metal shell 21 of the low-voltage electrical equipment and the arc-starting body 3 respectively. The arc-starting body 3 is located between the high-voltage body 1 under the high-voltage environment and the metal shell 21 of the low-voltage equipment 2, so that the arc-starting body 3, the inductor 4 and the metal shell 21 form the discharge object of the high-voltage body.

[0028] The arc starter 3 is used to guide the high voltage body 1 to discharge and generate high frequency electromagnetic radiation, and the inductor 4 is used to filter the high frequency electromagnetic radiation to suppress the electromagnetic interference of the high voltage body on the low voltage circuit 22 in the low voltage device 2.

[0029] Specifically, the high-voltage discharge protection device provided in the embodiment of the present application, that is, for low-voltage equipment used in a high-voltage environment, a metal object can be placed between the high-voltage body 1 and the metal shell 21 of the low-voltage equipment 2, and an inductor 4 can be used to connect the arc starting body 3 and the metal shell 21. From the perspective of the high-voltage body 1, the arc starting body 3, the inductor 4 and the metal shell 21 are together regarded as a whole discharge object.

[0030] That is, the above structure can guide the high-voltage body 1 to discharge on the arc-starting body 3, that is, guide the electric spark 2 originally struck on the metal shell 21 to the arc-starting body 3, so that the high-frequency electromagnetic radiation of the high-voltage body 1 occurs on the arc-starting body 3. Furthermore, since the value of the inductance is very small compared to the industrial frequency high voltage (such as 50HZ, 400HZ), the inductance can be used to filter the high-frequency electromagnetic radiation, ensuring that it can act on the metal shell 21 of the low-voltage equipment 2 only after filtering, that is, it is an integral discharge object for the high-voltage body 1.

[0031] In detail, when the electric spark, that is, the high-frequency electromagnetic radiation generated by the high-voltage body 1 is transmitted to the arc-starting body 3, the specific suppression process is as follows: a transient voltage change is generated on the arc-starting body 3, causing secondary electromagnetic radiation to be generated on the arc-starting body 3 (and this secondary electromagnetic radiation is outside the metal shell 21, so it does not affect the low-voltage circuit inside the metal shell); after the transient voltage passes through the inductor 4, the high-frequency characteristics are filtered out, and the voltage change acting on the metal shell 21 becomes slow, so there will be no transient voltage change on the metal shell 21, and there will be no secondary electromagnetic radiation. At the same time, due to the high-frequency blocking characteristics of the inductor, the spark intensity of the discharge is also significantly suppressed, that is, effective protection of the circuit in the low-voltage equipment is achieved.

[0032] It can be understood that the protection device in some embodiments of the present application can flexibly set the specific structure and setting method of the arc starting body according to the actual application scenario, that is, it can be flexibly adjusted according to the specific structure of the metal casing of the actual low-voltage equipment.

[0033] For example, in some embodiments, the arc starter can be disposed around the metal shell of the low-voltage device, and the arc starter and the metal shell can be isolated by an insulating material.

[0034] For another example, the arc starting body may also be an arc starting wire 31 surrounding the metal shell.

[0035] Optionally, in some embodiments of the present application, in order to enhance the suppression effect, more than one inductor may be set between the metal shell and the arc starting body, such as setting a first inductor 41 (such as inductor 1) and a second inductor 42 (such as inductor 2), and the first inductor and the second inductor are connected in series.

[0036] That is, in some embodiments, two different inductors are used in series.

[0037] Furthermore, in some embodiments, since actual inductors have different effective operating frequency limits and different inductance characteristics, the first inductor 41 may be selected as a high-frequency inductor and the second inductor 42 may be selected as a low-frequency inductor.

[0038] For example, the effective operating frequency of the first inductor 41 can reach above 100MHZ, but the inductance is relatively small, which is 100uH; the second inductor 42 is a low-frequency inductor, and the effective operating frequency can be below 100KHZ, but the inductance is relatively large, reaching 100mH. Under this configuration, the intensity of arc discharge is significantly suppressed.

[0039] On the other hand, the present application also provides a low-voltage device, which is used in a high-voltage environment and is equipped with a high-voltage discharge protection device as described in the above embodiments.

[0040] For example, Figure 3 and Figure 4 As shown, in the high-voltage insulator detection scenario, a crawler-type ultra-high voltage insulator zero-value detection robot is used to perform the operation.

[0041] That is, on the other hand, the present application also provides a high-voltage insulator inspection robot, which may include a robot body (i.e., a zero-value detection robot 6) and a zero-value detection device 7, in which a detection and control device 8 is configured, and the detection and control device is arranged in a metal shell, and the high-voltage discharge protection device described in the above-mentioned embodiments is arranged outside the metal shell, such as an arc starter wire 31 and an inductor 4 (such as a first inductor 41 and a second inductor 42).

[0042] It can be understood that the detection robot can work on 110KV-800KV high-voltage lines and perform zero-value detection on insulators 5. The detection and control device 8 of the robot is composed of a low-voltage circuit, and the entire low-voltage circuit is placed in a metal shell, so that the low-voltage circuit can work safely in a high-voltage electromagnetic field environment.

[0043] Insulators are high-voltage charged bodies. When the distance between the metal shell and the insulator is not enough to cover the insulation distance of the air, the air between them is ionized, and the insulator discharges to the metal shell. The intensity of the discharge is proportional to the surface volume of the metal shell. The electric sparks generated by the discharge and the secondary electromagnetic radiation caused by the discharge will seriously affect the safety of the low-voltage circuits in the metal shell and cause the robot to lose control.

[0044] The improved robot in the present application adds a circle of metal wire, namely, the arc-starting wire, through the metal shell of the detection device facing the insulator; the arc-starting wire and the metal shell are isolated by insulating material; the arc-starting wire and the metal shell are connected by an inductor to form a new high-voltage discharge object.

[0045] When the distance between the insulator and the zero-value detection device is not enough for air insulation, the air is ionized and discharge occurs. Because the arc wire and the insulator are closer, the discharge sparks will be concentrated on the arc wire. The discharge current on the arc wire can reach the metal casing only after passing through the inductor. Since the metal volume of the arc wire is much smaller than the volume of the metal casing, most of the high-frequency energy in the arc is suppressed by the inductor at this time, and the low-voltage control circuit in the metal casing is safely protected.

[0046] It can be understood that, in practice, after the insulating part in the structure is removed, the positional relationship between the arc-starting wire, the inductor and the metal shell can be displayed.

[0047] This robot uses two different inductors connected in series. This is because the actual inductors have different effective working frequency limits and different inductance characteristics. Inductor 1 is selected as a high-frequency inductor with an effective working frequency of more than 100MHZ, but the inductance is relatively small, 100uH; Inductor 2 is a low-frequency inductor with an effective working frequency below 100KHZ, but the inductance is relatively large, reaching 100mH. Under this configuration, the intensity of arc discharge is significantly suppressed.

[0048] The high-voltage discharge protection device, low-voltage equipment, and high-voltage insulator inspection robot provided by the present application are configured by arranging an arc-starting body and an inductor between the high-voltage body and the metal shell of the low-voltage equipment under a high-voltage environment, and the inductor is electrically connected to the arc-starting body and the inductor respectively, so that the arc-starting body, the inductor, and the metal shell form a discharge object of the high-voltage body, so that in actual operation, that is, when the high-voltage body discharges, the arc-starting body can guide the electric spark generated by the high-voltage body, and then after the electric spark hits the arc-starting body, a transient voltage will be generated on the arc-starting body and transmitted to the inductor, so as to filter the transient voltage in the inductor, so that the voltage acting on the metal shell changes slowly, that is, no transient voltage change can be generated on the metal shell, and no secondary electromagnetic radiation is generated, so that the metal shell and the high-voltage part are avoided. When the distance is close or the insulation strength between the two is insufficient, the discharge phenomenon still occurs, which effectively protects the circuit in the low-voltage equipment and ensures the normal operation of the low-voltage circuit inside the metal shell; at the same time, due to the high-frequency blocking characteristics of the inductor, the spark intensity of the high-voltage body discharge is also significantly suppressed.

[0049] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A high voltage discharge protection device, characterized in that: The protection device is used in low voltage electrical equipment under high voltage environment, and the protection device comprises: An arc starter and at least one inductor; The inductor is electrically connected to the metal shell of the low-voltage electrical device and the arc-starting body respectively, and the arc-starting body is located between the high-voltage body in the high-voltage environment and the metal shell of the low-voltage device, so that the arc-starting body, the inductor and the metal shell form the discharge object of the high-voltage body; The arc starter is used to guide the high voltage body to discharge and generate high-frequency electromagnetic radiation, and the inductor is used to filter the high-frequency electromagnetic radiation to suppress the electromagnetic interference of the high voltage body on the low voltage circuit in the low voltage equipment.

2. The high voltage discharge protection device according to claim 1, characterized in that: The arc starting body is arranged around the metal shell of the low voltage equipment, and the arc starting body and the metal shell are isolated by insulating material.

3. The high voltage discharge protection device according to claim 2, characterized in that: The arc starting body is an arc starting wire.

4. The high voltage discharge protection device according to claim 1, characterized in that: A first inductor and a second inductor are arranged between the metal shell and the arc starting body, and the first inductor and the second inductor are connected in series.

5. The high voltage discharge protection device according to claim 4, characterized in that: The first inductor is a low-frequency inductor, and the second inductor is a high-frequency inductor.

6. A low voltage device, characterized in that: The low voltage equipment is used in a high voltage environment, and the low voltage equipment is equipped with a high voltage discharge protection device as claimed in any one of claims 1 to 5.

7. A high voltage insulator inspection robot, characterized in that: The detection robot includes a robot body and a zero-value detection device, wherein the zero-value detection device is provided with a detection and control device, and the detection and control device is arranged in a metal shell, and a high-voltage discharge protection device as described in any one of claims 1 to 5 is arranged outside the metal shell.

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