A DC grounding detection device

Abstract

The present application provides a DC grounding proof wire detector, comprising two electrical measuring parts, the electrical measuring parts comprising: a relay, a probe, an elastic component, a battery and a first switch; one end of the relay is connected to the probe, the probe is connected to one end of the elastic component, one end of the elastic component is connected to one end of the battery; the other end of the battery is connected to one end of the first switch, the other end of the first switch is connected to the other end of the relay and then grounded. The DC grounding proof wire detector provided by the present application can quickly perform secondary circuit cable inspections, and effectively prevent the DC grounding caused by the circuit structure problems of the wire detector itself during the construction process when the technicians use the wire detector to inspect, which may cause the power grid system protection to malfunction, and can effectively ensure the safe operation of the power grid.

Description

Technical Field

[0001] The present application relates to the technical field of circuit inspection, and in particular to a line inspector for preventing direct current grounding. Background Art

[0002] For a long time, in the construction process of power plant and power grid expansion, transformation, maintenance and calibration, industry insiders mainly use multimeters, test lamps and other tools to check the secondary circuit. In the process of checking the secondary circuit, the circuit characteristics of these tools often cause the DC system to be grounded, resulting in malfunction of the protection link, causing the power grid's operating switch to trip without fault, which brings serious harm to the operation of the power grid. In order to avoid such accidents, a reliable and efficient tool for secondary circuit inspection is needed to improve work efficiency and avoid malfunction of the protection link caused by DC grounding. Summary of the invention

[0003] The present application provides a DC grounding protection line detector to at least solve the problem of protection malfunction caused by DC grounding of the circuit due to the characteristics of the inspection tool when the technician uses the inspection tool to inspect the circuit in the prior art.

[0004] According to one aspect of the present application, a DC grounding protection line detector is provided, comprising two electrical measurement parts, wherein the electrical measurement parts comprise: a relay, a probe, an elastic component, a battery and a first switch.

[0005] One end of the relay is connected to the probe, the probe is connected to one end of the elastic component, and one end of the elastic component is connected to one end of the battery; the other end of the battery is connected to one end of the first switch, and the other end of the first switch is connected to the other end of the relay and then grounded.

[0006] In one embodiment, the elastic component includes: a gasket, a spring and a spring fixing seat. The probe is connected to the spring through the gasket; and the spring fixing seat is electrically connected to one end of the battery.

[0007] In one embodiment, the gasket is an insulating gasket.

[0008] In one embodiment, a safety indicator light is connected between the battery and the first switch.

[0009] In one embodiment, an alarm indicator light is connected in parallel at both ends of the battery, the alarm indicator light is connected in series with a second switch, and the relay can control the closing of the second switch.

[0010] In one embodiment, the first switch is a normally closed switch, and the second switch is a normally open switch.

[0011] In one embodiment, the polarities of the two batteries of the power measuring unit are opposite.

[0012] In one embodiment, when the relay is energized, the first switch may be controlled to be opened and the second switch may be controlled to be closed.

[0013] In one embodiment, the elastic component includes: a gasket, an elastic sheet and an elastic sheet fixing seat. The probe is connected to the elastic sheet through the gasket; and the elastic sheet fixing seat is connected to one end of the battery.

[0014] In one embodiment, the spring piece may be an insulating spring piece.

[0015] The present application provides a line checker that is resistant to DC grounding, which can quickly perform secondary circuit cable inspections and effectively prevent false operation of power grid system protection due to DC grounding caused by circuit structure problems of the line checker itself during the construction process when technicians use the line checker to inspect, thereby effectively ensuring the safe operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of a DC grounding protection wire detector in this application. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] During the construction of power plants and power grids, such as expansion, renovation, inspection and calibration, industry professionals mainly use tools such as multimeters and test lamps to check secondary circuits. In the prior art, during the secondary circuit inspection, due to the circuit characteristics of these tools themselves, the DC system is often grounded, causing the protection link to malfunction, causing the power grid's operating switch to trip without fault, causing serious damage to the operation of the power grid. Based on the above reasons, the present application provides a line checker to prevent DC grounding, such as Figure 1 As shown, it includes: two electrical measuring parts, and the electrical measuring parts include: a relay K, a probe A, an elastic component, a battery and a first switch K1.

[0020] One end of the relay K is connected to the probe A, the probe A is connected to one end of the elastic component, and one end of the elastic component is connected to one end of the battery; the other end of the battery is connected to one end of the first switch K1, and the other end of the first switch K1 is connected to the other end of the relay K and then grounded.

[0021] In a specific embodiment, Figure 1 The dotted box is a single electrical measurement unit, and the main circuit of the electrical measurement unit is connected in series with a probe A and an elastic component, a relay K, and a first switch K1 (controlled by the relay). When the relay K is powered on, the first switch K1 can automatically pop open. The elastic component isolates the probe A from the battery. During the use of the wire finder, as the probe A contacts the wire 101 and is subjected to force, the elastic component is compressed, and the probe A can contact the battery. At this time, the first switch is disconnected, so the circuit will not be grounded. If there is no elastic component, the probe A is directly connected to the battery. When the probe A contacts the live wire 101, the relay is powered on. Before the first switch K1 is disconnected in time, the current passes through the probe A through the power supply and the undisconnected switch to the ground directly, which will cause false operation protection of the power grid. Therefore, the elastic component plays a buffering delay role, providing sufficient time for the disconnection of the first switch K1 to avoid DC grounding of the circuit caused by the first switch K1 not being disconnected in time.

[0022] In one embodiment, the elastic component includes: a gasket T, a spring and a spring fixing seat B, the probe A is connected to the spring through the gasket T, and the spring fixing seat B is electrically connected to one end of the battery.

[0023] In a specific embodiment, the elastic component may include a gasket T and a spring connected to the gasket T, the spring being connected to a spring fixing seat, and the spring fixing seat being a conductor. A probe A is fixed on the gasket, and the function of the gasket is to insulate the probe A from the spring to avoid contact between the probe A and the spring to form a path when the spring is made of a metal material. When the wire detector contacts the wire 101, the spring is gradually compressed, and the tail end of the probe A contacts and conducts with the spring fixing seat.

[0024] In one embodiment, the gasket T is an insulating gasket.

[0025] In a specific embodiment, when the spring is a conductor, the gasket T is an insulating gasket, which realizes the insulation function between the probe A and the spring. If the spring is an insulator, the gasket T can be an insulator or a non-insulator.

[0026] In one embodiment, a safety indicator light HLG is connected between the battery and the first switch.

[0027] In a specific embodiment, the safety indicator light HLG can be a green light. When the probe A contacts the wire 101 and squeezes the probe A to contact the spring fixing seat B, if there is no electricity on the wire 101, the battery releases current, the first switch K1 is closed, and the safety indicator light is on.

[0028] In one embodiment, an alarm indicator light HLR is connected in parallel at both ends of the battery to form a branch circuit. The alarm indicator light HLR is connected in series with a second switch K2, and the relay K can control the closing of the second switch K2.

[0029] In a specific embodiment, the alarm indicator light HLR may be a red light, and the second switch K2 is controlled by the relay K. When the relay K is powered on, the second switch K2 is closed and the first switch K1 is opened, and the alarm indicator light turns red.

[0030] In one embodiment, the first switch is a normally closed switch, and the second switch is a normally open switch.

[0031] In one embodiment, the polarities of the two batteries of the power measuring unit are opposite.

[0032] In a specific embodiment, one of the batteries in the two electrical test parts of the line checker is installed in the normal direction and the other is installed in the reverse direction. That is, the negative pole of the battery in one electrical test part is connected to the switch K1, and the positive pole of the battery in the other electrical test part is connected to the switch K1.

[0033] In one embodiment, when the relay K is energized, the first switch may be controlled to be opened and the second switch may be controlled to be closed.

[0034] In one embodiment, the elastic component includes: a gasket, an elastic sheet and an elastic sheet fixing seat; the probe is connected to the elastic sheet through the gasket; and the elastic sheet fixing seat is connected to one end of the battery.

[0035] In a specific embodiment, the spring in the elastic component may also be replaced by other elastic elements such as spring sheets.

[0036] In one embodiment, the spring piece may be an insulating spring piece.

[0037] The wire checker in the present application can improve the efficiency of secondary circuit inspection, and at the same time avoid the DC grounding caused by the structure of the wire checker itself during the inspection process, which causes the grid protection to malfunction and avoids losses. The wire checker in the present application has an elastic component, which realizes the function of buffering the electrical connection, so that the relay has sufficient time to close or open the switch.

[0038] Specific embodiments are used in this application to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core idea of ​​this application. At the same time, for those skilled in the art, according to the idea of ​​this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on this application.

[0039] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the hardware + program embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. Although the embodiments of this specification provide method operation steps as described in the embodiments or flow charts, more or fewer operation steps may be included based on conventional or non-creative means. The order of steps listed in the embodiments is only one way of executing the order of many steps, and does not represent the only execution order. When the device or terminal product in practice is executed, it can be executed in the order of the method shown in the embodiments or the drawings or in parallel (for example, a parallel processor or a multi-threaded processing environment, or even a distributed data processing environment).

[0040] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradicting each other. The above is only an embodiment of the embodiment of this specification and is not intended to limit the embodiment of this specification. For those skilled in the art, the embodiment of this specification may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiment of this specification shall be included in the scope of the claims of the embodiment of this specification.

Claims

1. A DC grounding detection device, characterized in that: It includes two electrical measurement parts, and the electrical measurement parts include: a relay, a probe, an elastic component, a battery and a first switch; One end of the relay is connected to the probe, the probe is connected to one end of the elastic component, and one end of the elastic component is connected to one end of the battery; the other end of the battery is connected to one end of the first switch, and the other end of the first switch is connected to the other end of the relay and then grounded; wherein the first switch is a normally closed switch, and when the relay is energized, the first switch is disconnected; the probe is used to be connected to the battery; the elastic component is used to be compressed when the relay is energized to isolate the connection between the probe and the battery.

2. The DC grounding detection device according to claim 1, characterized in that: The elastic component includes: a gasket, a spring and a spring fixing seat; The probe is connected to the spring through the gasket; the spring fixing seat is electrically connected to one end of the battery.

3. The DC grounding detection device according to claim 2, characterized in that: The gasket is an insulating gasket.

4. The anti-DC grounding wire detector according to claim 1, characterized in that: A safety indicator light is connected between the battery and the first switch.

5. The DC grounding detection device according to claim 1, characterized in that: An alarm indicator light is connected in parallel at both ends of the battery, and the alarm indicator light is connected in series with a second switch. The relay can control the closing of the second switch.

6. The DC grounding detection device according to claim 5, characterized in that: The first switch is a normally closed switch, and the second switch is a normally open switch.

7. The DC grounding detection device according to claim 1, characterized in that: The polarities of the two batteries in the electricity measuring unit are opposite.

8. The DC grounding detection device according to claim 5, characterized in that: When the relay is powered on, the first switch may be controlled to be opened and the second switch may be controlled to be closed.

9. The DC grounding detection device according to claim 1, characterized in that: The elastic component includes: a gasket, a spring and a spring fixing seat; The probe is connected to the spring sheet through the gasket; and the spring sheet fixing seat is connected to one end of the battery.

10. The DC grounding protection wire detector according to claim 9, characterized in that: The spring piece may be an insulating spring piece.

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