CN211653101U

CN211653101U - Detection apparatus for undercurrent ground fault

Info

Publication number: CN211653101U
Application number: CN201922053241.3U
Authority: CN
Inventors: 李有芹; 李梅
Original assignee: Anhui Weidian Power Technology Co ltd
Current assignee: Anhui Weidian Power Technology Co ltd
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-10-09
Anticipated expiration: 2029-11-25

Abstract

The utility model discloses a small current ground fault detection device, belonging to the technical field of electric power overhaul, comprising a detection box and a sensor, the detection box is used for transmitting a simulated fault signal to a fault line, the sensor is used for collecting an abnormal signal and feeding the abnormal signal back to the detection box in a wireless transmission mode, the detection box is hinged with a box cover, the inner wall of the box cover is provided with a containing bag for containing tools, the top of the detection box is provided with an operation panel, the operation panel is provided with a display screen, used for displaying abnormal signals sent by the sensor, the side wall of the detection box is provided with a groove, the inside of the groove is hinged with a winding box, the wire winding box is characterized in that a wire winding disc is arranged inside the wire winding box and used for winding a power transmission line, one end of the power transmission line is connected with a transmitter of the detection box, and the other end of the power transmission line is fixed on a fault line through a wire clamping head. The detection equipment is integrated in the detection box, so that the detection box is convenient to carry and use.

Description

Detection apparatus for undercurrent ground fault

Technical Field

The utility model relates to a power maintenance technical field, in particular to undercurrent ground fault's detection device.

Background

The small current grounding system is a three-phase system with a neutral point not grounded or grounded through an arc suppression coil and high impedance, and is also called a neutral point indirect grounding system. When a ground fault occurs to a certain phase, the current of the ground fault is often much smaller than that of a load current due to the fact that a short circuit cannot be formed, so that the system is called as a small-current grounding system, a single-phase grounding fault in the small-current grounding system is a common temporary fault, when the fault occurs, the current of a fault point is small, line voltages between three phases are still symmetrical, and the line voltages have no influence on power supply of load equipment, so that the equipment in the system is allowed to run for a short time, and can run for 1-2 hours without tripping under the common condition, and therefore the reliability of the power supply is improved. However, grounding of one phase causes the voltage to ground of the other two phases to rise by several times the phase voltage, which threatens the insulation of the equipment, and if the grounding is not timely processed, insulation damage, two-phase short circuit and arc discharge can develop to cause overvoltage of the system. However, when a single-phase ground fault occurs in the system, since a loop is not formed, the ground current is distributed capacitance current, the value is much smaller than the load current, and the fault characteristics are not obvious, the ground fault detection is still a world problem, and a plurality of technologies need to be overcome.

The existing detection device for detecting the small-current ground fault generally comprises a transmitter, a sensor, a receiver and accessories, after a fault line is shut down, an ultralow-frequency high-voltage signal is applied to the line by the transmitter to enable the fault to reappear, the sensor transmits data to the receiver on the ground in a wireless mode, and the receiver displays a measurement result, so that a fault point is detected.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an it is low just to lie in order to solve above-mentioned undercurrent ground fault detection device work efficiency, and inconvenient carrying transportation and high altitude detect the problem that there is the potential safety hazard and propose a undercurrent ground fault's detection device, have each instrument integration portable transportation in the detection case, the sensor passes through insulating haulage rope and stimulates on ground, signal acquisition is efficient and safer advantage.

The utility model achieves the above purpose through the following technical proposal, a small current ground fault detection device comprises a detection box and a sensor, the detection box is used for transmitting a simulated fault signal to a fault line, the sensor is used for collecting an abnormal signal and feeding the abnormal signal back to the detection box in a wireless transmission mode, the detection box is hinged with a box cover, the inner wall of the box cover is provided with a containing bag for containing tools, the top of the detection box is provided with an operation panel, the operation panel is provided with a display screen, used for displaying abnormal signals sent by the sensor, the side wall of the detection box is provided with a groove, the inside of the groove is hinged with a winding box, the wire winding box is characterized in that a wire winding disc is arranged inside the wire winding box and used for winding a power transmission line, one end of the power transmission line is connected with a transmitter of the detection box, and the other end of the power transmission line is fixed on a fault line through a wire clamping head.

Preferably, a handle is mounted on the detection box.

Preferably, the wire twisting disc is rotatably connected with the wire winding box through the roller shaft, one end of the roller shaft penetrates through the outer wall of the wire winding box, and the roller shaft is rotated through the detachable rocker to drive the wire twisting disc to take up and pay off wires.

Preferably, the detachable rocker comprises a crank and an inserting rod, a fixing groove is formed in the end portion of the roller shaft, and the inserting rod is matched with the fixing groove in specification.

Preferably, the sensor is hung on the fault line and slides along the fault line, and an insulating traction rope is installed at the bottom of the sensor.

Preferably, the detection system is integrated in the detection box and comprises a main control unit, a power supply module, an analog signal transmitting module and a signal receiving module, wherein the analog signal transmitting module is electrically connected with the power transmission line, and the signal receiving module is electrically connected with the display screen.

Compared with the prior art, the beneficial effects of the utility model are that:

1. through setting up the winding box in the recess that the detection case lateral wall was seted up, when not using, the winding box is accomodate in the recess, during the use, the operation of receiving and releasing wire of power transmission line can be carried out to the upset winding box, unnecessary power transmission line winding is in the stranded conductor dish of winding incasement portion, the length of the arbitrary regulation power transmission line of rocker can be dismantled to the accessible, it is convenient to use, and wave after using up and to dismantle the rocker and pack up the power transmission line, portable, it is connected through the inserted bar between rocker and the winding box to dismantle, can use in inserting the fixed slot of roller with the inserted bar during the use, do not use and extract.

2. Through installing the handle on the detection case, be convenient for remove the whole detection case of transportation, still be equipped with on the case lid moreover and accomodate the bag, can accomodate the sensor and can dismantle the rocker, be convenient for supplementary measuring tool's of carrying.

3. Through set up insulating haulage rope in the bottom of sensor, insulating haulage rope is held by the staff, and the staff removes the back along the fault line, can make things convenient for the sensor to remove and gather abnormal signal, has not only improved work efficiency and has also reduced the potential safety hazard that exists at high altitude construction.

Drawings

Fig. 1 is a schematic view of the overall structure of the device of the present invention.

Fig. 2 is the utility model discloses a can dismantle rocker assembly structure sketch map.

Fig. 3 is a schematic diagram of the connection of the internal modules of the detection system of the present invention.

Fig. 4 is a schematic structural view of the detection box of the present invention when it is folded.

In the figure: 1. detection case, 2, sensor, 3, insulating haulage rope, 4, case lid, 5, accomodate the bag, 6, operating panel, 7, display screen, 8, handle, 9, recess, 10, wire winding case, 11, can dismantle the rocker, 12, power transmission line, 13, double-layered end of a thread, 14, roller, 15, fixed slot, 16, inserted bar, 17, crank.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, a small current ground fault detection device includes a detection box 1 and a sensor 2, the detection box 1 is used for transmitting a simulated fault signal to a fault line, the sensor 2 is used for collecting an abnormal signal and feeding the abnormal signal back to the detection box 1 in a wireless transmission manner, a box cover 4 is hinged on the detection box 1, a storage bag 5 is arranged on the inner wall of the box cover 4 for storing tools, an operation panel 6 is arranged on the top of the detection box 1, a display screen 7 is mounted on the operation panel 6 for displaying the abnormal signal transmitted by the sensor 2, a groove 9 is formed in the side wall of the detection box 1, a winding box 10 is hinged inside the groove 9, a winding disc is arranged inside the winding box 10 and used for winding a power transmission line 12, one end of the power transmission line 12 is connected with a transmitter of the detection box 1, the other end is fixed on the fault line through a wire clamping head 13, and an internal integrated detection system, the detection system comprises a main control unit, a power supply module, an analog signal transmitting module and a signal receiving module, wherein the analog signal transmitting module is electrically connected with a power transmission line 12, the signal receiving module is electrically connected with a display screen 7, as shown in figure 3, the detection system integrated with the detection box 1 is used for detecting a fault point of a fault line, after the fault line is stopped, firstly, a wire clamping head 13 is clamped on the fault circuit, the analog signal transmitting module applies voltage to the line to enable the fault to reappear, a sensor 2 is hung on the fault line, when current passes through the fault line, the current is collected by the sensor 2 and is sent to the signal receiving module in a signal wireless transmission mode, and finally, the current is displayed on the display screen 7, so that whether the signal is abnormal or not is judged, the power transmission line 12 connected with the fault line is wound on a stranded wire disc in the winding box 10, and the stranded wire disc is used, and the wire winding box 10 is turned over to expose the wire clamping head 13 when in use and is retracted into the groove 9 when not in use, as shown in fig. 4, the handle 8 is arranged on the detection box 1, the detection box 1 is covered by the box cover 4 to be convenient to carry and transport, and the sensor 2 can be placed in the storage bag 5 in the box cover 4.

The wire twisting disc is rotatably connected with the winding box 10 through a roller shaft 14, one end of the roller shaft 14 penetrates through the outer wall of the winding box 10 and rotates the roller shaft 14 through a detachable rocker 11 to drive the wire twisting disc to take up and pay off wires, the detachable rocker 11 comprises a crank 17 and an inserting rod 16, a fixing groove 15 is formed in the end portion of the roller shaft 14, the inserting rod 16 is matched with the fixing groove 15 in specification, the wire twisting disc inside the winding wire 10 is driven through the rotation of the roller shaft 14, the roller shaft 14 is driven by the detachable rocker 11, the detachable rocker 11 is inserted into the fixing groove 15 of the roller shaft 14 through the inserting rod 16, the wire twisting disc can be rotated by rotating the crank 17, when the detachable rocker 11 is not used, the inserting rod 16 is drawn out to store the detachable rocker 11 into the storage bag 5, the sensor 2 is hung on a fault line and slides along the fault line, an insulating traction rope 3 is installed at the bottom of, hang sensor 2 on the trouble circuit, through insulating haulage rope 3 remove on the trouble circuit at ground pulling sensor 2, detection efficiency is higher, and safe and reliable more.

The utility model discloses a theory of operation: when a fault line is encountered, the winding box 10 is firstly turned over, the transmission line 12 is pulled out, the wire clamping head 13 is clamped on the fault line, then the sensor 2 is hung on the fault line, the insulating traction rope 3 is hung down and controlled by a worker on the ground, the detection system of the detection box 1 is opened, the analog signal transmitting module is used for fault reappearing, a worker pulls the sensor 2 to move along a fault line, the sensor 2 continuously transmits collected signals back to the detection system and is displayed by the display screen 7, when the signals are abnormal, the fault position is detected, after the detection is finished, the thread clamping head 13 and the sensor 2 are taken down, the sensor 2 is put into the containing bag 5, and taking out the detachable rocker 11 from the storage bag 5, inserting the detachable rocker 11 into the roller shaft 14 fixing groove 15 of the winding box 10, taking up the wire, pushing the winding box 10 into the groove 9 after the wire is taken up, and covering the box cover 4 to carry the whole detection device.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a detection device of undercurrent ground fault, includes detection case (1) and sensor (2), detection case (1) are used for to trouble line transmission simulation fault signal, sensor (2) are used for gathering abnormal signal and feed back to through wireless transmission mode detection case (1), its characterized in that: articulated case lid (4) is gone up in detection case (1), it accomodates bag (5) and is used for accomodating the instrument to set up on the inner wall of case lid (4), the top of detection case (1) sets up operating panel (6), operating panel (6) are last to install display screen (7), are used for showing the abnormal signal that sensor (2) sent, recess (9) are seted up to the lateral wall of detection case (1), articulated winding case (10) of the inside of recess (9), the inside of winding case (10) is equipped with the stranded conductor dish, and the stranded conductor dish is used for twining power transmission line (12), the one end of power transmission line (12) with the transmitter of detection case (1) is connected, and the other end passes through double-layered line head (13) and fixes on the fault line.

2. A small current ground fault detection device according to claim 1, wherein: and a handle (8) is arranged on the detection box (1).

3. A small current ground fault detection device according to claim 1, wherein: the wire twisting disc is rotatably connected with the wire winding box (10) through a roller shaft (14), one end of the roller shaft (14) penetrates through the outer wall of the wire winding box (10), and the roller shaft (14) is rotated through the detachable rocker (11) to drive the wire twisting disc to take up and pay off wires.

4. A small current ground fault detection device according to claim 3, wherein: the detachable rocker (11) comprises a crank (17) and an inserting rod (16), a fixing groove (15) is formed in the end portion of the roller shaft (14), and the inserting rod (16) is matched with the fixing groove (15) in specification.

5. A small current ground fault detection device according to claim 1, wherein: the sensor (2) is hung on a fault line and slides along the fault line, and an insulating traction rope (3) is installed at the bottom of the sensor (2).

6. A small current ground fault detection device according to claim 1, wherein: the internal integrated detection system of the detection box (1) comprises a main control unit, a power supply module, an analog signal transmitting module and a signal receiving module, wherein the analog signal transmitting module is electrically connected with a power transmission line (12), and the signal receiving module is electrically connected with a display screen (7).