Portable direct current system ground fault locator with protection device

Abstract

The invention belongs to the technical field of electrical measurement, particularly relates to a portable direct current system ground fault locator with a protection device, and aims to solve the problem that detection equipment lacks enough anti-falling and anti-collision protection measures. The device comprises a signal detector and a signal generator, the signal detector and / or the signal generator further comprises a protection device, the protection device comprises a protection shell with an opening in the upper end, the protection shell comprises a bottom plate and a side shell body, and one or a group of damping buffer devices are arranged below the bottom plate of the protection shell. According to the device, vibration and damage of equipment when the equipment is impacted can be avoided or relieved, active protection measures of the equipment are improved, and the situation that the equipment is prone to damage after falling off is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical measurement, and in particular relates to a portable DC system ground fault locator with a protection device. Background Art

[0002] The relay protection and control in the substation generally adopt DC power supply. Therefore, whether the DC power supply system of the substation is safe directly affects the operation status of the substation. The grounding fault of the DC system is a fault that is easy to occur and has great harm to the power system. The DC system is an insulating system. Under normal circumstances, the insulation resistance of the positive and negative poles to the ground is equal, and the voltage of the positive and negative poles to the ground is balanced. When a point of grounding occurs, the voltage of the positive and negative poles to the ground changes, the voltage of the grounded pole to the ground decreases, and the voltage of the non-grounded pole increases. Whether the positive pole is grounded or the negative pole is grounded, it may cause false protection or protection refusal to operate, endangering the normal operation of the system.

[0003] Therefore, grounding of the DC system is a fault that is easy to occur and poses great harm to the power system. If the positive pole of the DC system is grounded, it may cause false operation of the relay protection, because the tripping coil is connected to the negative pole of the DC power supply, and the system is poorly grounded or insulated, which may cause false operation of the protection. If the negative pole of the DC system is grounded and the system is poorly grounded or insulated, it may short-circuit the tripping circuit or closing circuit, causing the protection to fail to operate. At this time, the system fails, and the refusal to operate the protection will inevitably lead to the expansion of the system accident, and may also burn out the contacts of the relay or burn out the fuse. Therefore, a DC system grounding fault locator is generally used to regularly detect whether there is a fault in the DC system grounding, so as to promptly discover the grounding situation of the DC system and take corresponding measures in a timely manner.

[0004] However, when workers use the existing fault locator detection equipment, they generally hold the detection equipment in their hands and then connect the other end of the equipment to the outside of the equipment to be detected for detection. When the workers accidentally drop the detection equipment while carrying, moving or using it, the existing detection equipment lacks sufficient protection measures, which can easily cause damage to the equipment and cause unpredictable consequences. Summary of the invention

[0005] In order to solve the above-mentioned problem in the prior art, namely, the problem that the detection equipment lacks sufficient protection measures against falling and collision, the present invention provides a portable DC system ground fault locator with a protection device.

[0006] The technical solution of the present invention includes: A portable DC system ground fault locator with a protection device, comprising a signal detector and a signal generator, wherein the signal detector and / or the signal generator also comprises a protection device, wherein the protection device comprises a protection shell with an open upper end, wherein the protection shell comprises a bottom plate and a side shell, wherein one or a group of damping buffer devices are arranged below the bottom plate of the protection shell, wherein the damping buffer device comprises at least a central axis, wherein the upper end of the central axis is connected to the bottom plate of the protection shell, and the other end is provided with a force plate, wherein a group of damping rods are arranged at the outer edge of the force plate and connected to the bottom plate of the protection shell.

[0007] As an optional technical solution, the force-bearing plate is a petal-shaped plate centered on the central axis and evenly distributed along the circumferential direction, and the damping rod is provided at the end of each branch of the petal-shaped plate.

[0008] As an optional technical solution, a spring is sleeved on the central axis, and the spring is located between the force-bearing plate and the protective shell. The force-bearing plate is sleeved on the central axis and can move along the central axis.

[0009] As an optional technical solution, a connecting plate is also included, which is arranged below the protective shell and is closely connected to the bottom plate of the protective shell. The central axis of the damping buffer device and the upper end of the damping rod are both connected to the connecting plate.

[0010] As an optional technical solution, a plurality of front protection devices are provided on the upper end surface of the side shell of the protective shell, and the front protection device includes a fixing seat fixedly connected to the side shell, and also includes a baffle, and a bent connecting portion is provided at one end of the baffle, and the connecting portion is hinged to the fixing seat, and one or a group of elastic buffer protrusions are provided on the plate surface of the baffle.

[0011] As an optional technical solution, the elastic buffer protrusion is a rubber column inserted on the surface of the baffle.

[0012] As an optional technical solution, at least one or a group of the front protection devices are provided at each corner or at a position adjacent to a corner of the upper end surface of the side shell of the protective shell.

[0013] As an optional technical solution, a tightening belt for holding is provided on the outer side surface of one or both sides of the protective shell.

[0014] As an optional technical solution, one or a group of limiting holes for positioning are provided on one side or both sides of the protective shell, and a positioning pin for fastening is provided in the limiting hole, and the positioning pin is threadedly connected to the limiting hole.

[0015] A transmission line is clamped on the front end side of the signal detector, and the other end of the transmission line is electrically connected to the caliper. The caliper includes two mutually intersecting caliper arms, which are hinged at the intersection of the caliper arms through a rotating shaft, and an end cover for fastening is provided at the lower end of the rotating shaft, and the end cover is connected to the rotating shaft by a thread.

[0016] Beneficial effects of the present invention: (1) The portable DC system ground fault locator with a protective device of the present invention can absorb the impact force on the back of the device when the device falls or bumps, thereby avoiding or reducing the vibration and damage of the device when it is impacted, improving the active protection measures of the device and avoiding damage to the device when it falls or bumps, through the coordinated arrangement of the protective shell, the force-bearing plate, the connecting plate, the damping rod and the spring.

[0017] (2) The portable DC system ground fault locator with a protective device of the present invention increases the contact between the force-bearing plate and the ground by setting a petal-shaped force-bearing plate. On the other hand, it further optimizes the force state when impacted by utilizing the dispersed damping rods and springs. The impact force is transmitted more evenly and absorbed by the dispersed damping rods and springs, thereby further improving the protection performance of the device.

[0018] (3) The portable DC system ground fault locator with a protective device of the present invention can fully cushion the impact of the device when it falls or bumps on the front side by means of the front protective device arranged along the outer edge of the front side of the device, especially the front protective device arranged at the corner of the device, thereby providing a more comprehensive protection measure for the device.

[0019] (4) The portable DC system ground fault locator with a protection device of the present invention also provides a more suitable holding point for the staff through the setting of a tightening belt, making it convenient for the staff to take, carry or hold the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 It is a schematic diagram of the structure of the signal detector and the protective shell of the present invention; Figure 2 It is a schematic structural diagram of the protective shell and the damping buffer device of the present invention; Figure 3 It is a structural schematic diagram of the damping buffer device of the present invention; Figure 4 is a schematic structural diagram of a front protection device of the present invention; Figure 5 is a schematic structural diagram of a caliper of the present invention; Figure 6 It is a schematic diagram of the portable DC system ground fault locator of the present invention.

[0021] Reference numerals include: 1-Signal detector, 2-Protective shell, 3-Connecting plate, 4-Damper rod, 5-Force plate, 6-Spring, 7-Tightening belt, 8-Pin, 9-Block, 10-Display screen, 11-Warning light, 12-Button, 13-Switch, 14-Air outlet, 15-Filter, 16-Limiting hole, 17-Location pin, 18-Transmission line, 19-Caliper, 20-Shaft, 21-End cover, 22-Signal generator, 23-Red line, 24-Black line, 25-Baffle, 26-Rubber pad. DETAILED DESCRIPTION

[0022] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the relevant invention are shown in the accompanying drawings.

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] The invention provides a portable DC system ground fault locator with a protection device.

[0025] like Figure 6 As shown, it includes a signal detector 1 and a signal generator 22. One side of the signal generator 22 is electrically connected with a red line 23 and a black line 24. The signal detector 1 includes a display screen 10. The setting of the red line 23 and the black line 24 makes it convenient for the staff to connect the signal generator 22 with external equipment.

[0026] When testing external equipment, clamp the red wire 23 to the busbar, the black wire 24 to the ground wire, correctly connect the signal generator 22 to the external equipment, use the caliper 19 to clamp the DC system wire to be tested, turn on the power switch, the signal generator 22 starts to output signals, and at the same time the signal detector 1 receives and processes the signals transmitted by the signal generator 22, and the display screen 10 displays and determines the faulty branch.

[0027] like Figure 1 As shown, an air outlet 14 for heat dissipation is provided on the side of the signal detector 1, and a filter 15 for filtering is fixed to the inner wall of the air outlet 14. The air outlet 14 can provide a heat dissipation channel to prevent it from overheating, and the filter 15 can prevent dust and other debris from entering the interior of the device.

[0028] The dial of the signal detector 1 is provided with a warning light 11 and a switch 13 for alarming, as well as a button 12 for controlling the function of the device. When a ground fault is detected, the warning light 11 will light up to remind the user.

[0029] The signal detector 1 and the signal generator 22 are both existing detection devices, which are electrically connected to an external main controller and 220V mains electricity when in use, and the main controller can be a conventional control device such as a computer.

[0030] A protective shell 2 is disposed outside the signal detector 1. The protective shell 2 is a shell with an open upper end, including a bottom plate and a side shell. A limiting hole 16 for positioning is provided on the side shell of the protective shell 2. The positioning pin 17 is connected and fastened to the limiting hole 16 by threading. Through the cooperation of the limiting hole 16 and the positioning pin 17, the protective shell 2 is fixed to the outside of the signal detector 1 to protect the signal detector 1.

[0031] A tightening belt 7 is provided at one outer end of the protective shell 2, and both ends of the tightening belt 7 are fastened to the protective shell 2 by pins 8. The tightening belt 7 is convenient for taking and holding when in use, and is also convenient for carrying when in use, which can reduce the hidden dangers caused by misoperation.

[0032] like Figure 2 and Figure 3 As shown, the bottom of the protective shell 2 is fixedly connected with a connecting plate 3 by screws, and the bottom of the connecting plate 3 is threadedly connected with two damping buffer devices, each of which includes a central axis, on which a spring 6 is sleeved, and the upper end of the central axis is fixedly connected with the connecting plate 3 by threads, and the lower end is plugged into the force-bearing plate 5, and the force-bearing plate 5 can move up and down along the central axis. When the force-bearing plate 5 is impacted, the spring 6 will absorb part of the impact force from the force-bearing plate 5, and reduce the impact on the signal detector 1.

[0033] As an embodiment, a damping buffer device, or three or four damping buffer devices may be optionally set under the connecting plate 3, or more damping buffer devices may be set according to actual needs, and the layout of the damping buffer devices may also be changed according to actual needs.

[0034] Figure 3 The middle load-bearing plate 5 is a petal-shaped plate with a cross structure. In fact, the load-bearing plate 5 can also select other petal-shaped structures such as three-petal, five-petal, six-petal, etc., or due to the limitations of the specific application environment, the load-bearing plate 5 can also select an asymmetric petal-shaped plate, or other arbitrary shape of plate structure.

[0035] Each petal branch end of the force-bearing plate 5 is provided with a damping rod 4 for buffering. The lower end of the damping rod 4 is connected to the force-bearing plate 5 through a thread, and the upper end is plugged into the connecting plate 3 through a pin shaft and a pin hole.

[0036] As another embodiment, the connecting plate 3 may be omitted, and the damping and buffering device may be directly connected to the bottom plate of the protective shell 2 .

[0037] like Figure 4 As shown, a plurality of front protection devices are distributed along the outer edge of the side shell at the upper end of the protective shell 2, and each front protection device includes a clamping block 9 fixedly connected to the outer edge of the upper end of the side shell of the protective shell 2. The clamping block 9 is hinged to the baffle 25 through a hinge shaft. The baffle 25 is an L-shaped bending structure. The baffle 25 can rotate around the hinge shaft and fit tightly against the upper surface of the signal detector 1, and is used to fix and position the signal detector 1. When the signal detector 1 is installed in the protective shell 2, the baffle 25 is rotated to fix and limit the signal detector 1.

[0038] A rubber pad 26 for buffering is fixedly provided on the upper surface of the baffle 25 by insertion or threaded connection.

[0039] As another embodiment, the rubber pad 26 may also adopt other structures, such as a rubber column, a rubber block, or other elastic protrusion structures with a buffering function.

[0040] The front protection device can provide protection for the upper surface of the device to avoid or reduce the impact on the upper surface when it falls or bumps.

[0041] As a preferred embodiment, one or more front protection devices are provided at each corner of the upper end of the protective shell 2 to provide special protection measures for these corners that are more susceptible to impact.

[0042] like Figure 5 As shown, a transmission line 18 is clamped on one side of the signal detector 1, and the other end of the transmission line 18 is fixedly electrically connected to a caliper 19. The caliper 19 includes mutually intersecting clamp arms, which are hinged at the intersection position through a rotating shaft 20. The free end of the rotating shaft 20 is connected to an end cover 21 through a thread, and the end cover 21 limits the free end of the rotating shaft 20.

[0043] The transmission line 18 and the clamp 19 can be used to clamp the conductors in the DC system to help receive the detection signal.

[0044] In the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0045] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus / device.

[0047] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A portable DC system ground fault locator with a protection device, comprising a signal detector (1) and a signal generator (22), characterized in that: The signal detector (1) and / or the signal generator (22) further comprises a protective device, the protective device comprising a protective shell (2) with an open upper end, the protective shell (2) comprising a bottom plate and a side shell, one or a group of damping and buffering devices being arranged below the bottom plate of the protective shell (2), the damping and buffering devices comprising at least a central axis, the upper end of the central axis being connected to the bottom plate of the protective shell (2), and the other end being provided with a force-bearing plate (5), the outer edge of the force-bearing plate (5) being provided with a group of damping rods (4) connected to the bottom plate of the protective shell (2).

2. The portable DC system ground fault locator with protection device as claimed in claim 1, characterized in that: The force-bearing plate (5) is a petal-shaped plate piece that is centered on the central axis and evenly distributed in the circumferential direction, and the damping rod (4) is provided at the end of each branch of the petal-shaped plate piece.

3. The portable DC system ground fault locator with protection device as claimed in claim 2, characterized in that: A spring (6) is sleeved on the central axis, and the spring (6) is located between the force-bearing plate (5) and the protective shell (2). The force-bearing plate (5) is sleeved on the central axis and can move along the central axis.

4. The portable DC system ground fault locator with protection device as claimed in claim 1, characterized in that: It also comprises a connecting plate (3), the connecting plate (3) being arranged below the protective shell (2) and being closely connected to the bottom plate of the protective shell (2), the central axis of the damping buffer device and the upper end of the damping rod (4) being both connected to the connecting plate (3).

5. The portable DC system ground fault locator with protection device as claimed in claim 1, characterized in that: The upper end surface of the side shell of the protective shell (2) is provided with a plurality of front protection devices, the front protection devices comprising a fixing seat (9) fixedly connected to the side shell, and a baffle (25), one end of the baffle (25) being provided with a bent connecting portion, the connecting portion being hinged to the fixing seat (9), and one or a group of elastic buffer protrusions (26) being provided on the plate surface of the baffle (25).

6. The portable DC system ground fault locator with protection device as claimed in claim 5, characterized in that: The elastic buffer protrusion (26) is a rubber column inserted on the surface of the baffle plate (25).

7. The portable DC system ground fault locator with protection device as claimed in claim 6, characterized in that: At least one or a group of front protection devices are provided at each corner or at a position adjacent to a corner of the upper end surface of the side shell of the protection shell (2).

8. The portable DC system ground fault locator with protection device as claimed in claim 1, characterized in that: A tightening belt (7) for holding is provided on the outer side surface of one or both sides of the protective shell (2).

9. The portable DC system ground fault locator with protection device as claimed in claim 1, characterized in that: One or a group of limiting holes (16) for positioning are provided on one side or both sides of the protective shell (2), a positioning pin (17) for fastening is provided in the limiting hole (16), and the positioning pin (17) is threadedly connected to the limiting hole (16).

10. The portable DC system ground fault locator with protection device as claimed in claim 1, characterized in that: A transmission line (18) is clamped on the front side of the signal detector (1), and the other end of the transmission line (18) is electrically connected to a caliper (19). The caliper (19) comprises two mutually intersecting caliper arms, and the intersection of the caliper arms is hinged through a rotating shaft (20), and the lower end of the rotating shaft (20) is provided with an end cover (21) for fastening, and the end cover (21) is connected to the rotating shaft (20) by a thread.

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