CN209911440U - Direct current transmission device and transformer neutral point direct current test system - Google Patents

Abstract

The utility model relates to a direct current send device and transformer neutral point direct current test system. The direct current transmission device comprises a first shell, a second shell, a first Hall sensor, a second Hall sensor and a motor assembly. The first Hall sensor and the motor component are arranged in the first shell, and the second Hall sensor is arranged in the second shell; the motor assembly comprises a motor, a guide rod arranged on the motor and a moving part arranged on the guide rod, wherein the guide rod comprises a first end and a second end which are opposite, the first Hall sensor is arranged close to the first end, the moving part is fixedly connected with the second shell, and the moving part is used for moving between the first end and the second end when driven by the motor and driving the second shell to move relative to the first shell, so that the second Hall sensor can move relative to the first Hall sensor. The detection personnel only need control motor drive moving part and remove, just can realize direct current transfer device's dismantlement, has ensured detection personnel's personal safety.

Description

Direct current transmission device and transformer neutral point direct current test system

Technical Field

The utility model relates to an electric power monitoring technology field especially relates to a direct current transformer and transformer neutral point direct current test system.

Background

The neutral point of the transformer refers to a connection symmetry point and a voltage balance point of each phase of power equipment (such as a generator, a transformer, a load and the like) with windings or coils in star connection in a three-phase power system, and the ground potential of the neutral point is zero or close to zero when the power system normally operates. When the three-phase voltage of the neutral point is unbalanced, the loss of the transformer is increased (including no-load loss and load loss), and even the transformer is burnt.

At present, a tester usually needs to manually install current monitoring equipment such as a power transmitter on a cable to be tested of a transformer under the condition that the transformer is powered off, then the transformer is powered on so as to collect parameters of direct current of a neutral point of the transformer, and the current monitoring equipment is taken off after the transformer is powered off after the transformer is tested to be finished. Because the detection personnel all need to locate the environment of high pressure, strong magnetic field around the transformer many times at the installation and dismantle current monitoring equipment in-process, have great personal safety hidden danger.

SUMMERY OF THE UTILITY MODEL

Therefore, the direct current transmission device and the transformer neutral point direct current testing system are needed to be provided for solving the problem that great personal safety hidden danger exists in the process of installing and detaching the current monitoring equipment for many times by detection personnel.

A direct current transmission device comprises a first shell, a second shell, a first Hall sensor, a second Hall sensor and a motor assembly, wherein the first Hall sensor and the motor assembly are arranged in the first shell, and the second Hall sensor is arranged in the second shell;

the motor assembly comprises a motor, a guide rod arranged on the motor and a moving part arranged on the guide rod, the guide rod comprises a first end and a second end which are opposite, the first Hall sensor is arranged close to the first end, the moving part is fixedly connected with the second shell, and the moving part is used for moving between the first end and the second end when being driven by the motor and driving the second shell to move relative to the first shell, so that the second Hall sensor can move relative to the first Hall sensor.

In the direct current transmission device, the movable member can move between the first end and the second end of the guide rod when being driven by the motor, so that the second shell is driven to move relative to the first shell. Based on this, direct current send device can be when the second casing is close to first casing, and the lock is on the cable that awaits measuring of transformer neutral point, also can gather the current parameter of transformer neutral point when second hall sensor and first hall sensor are close to each other, can also loosen the cable that awaits measuring of transformer when the first casing is kept away from to the second casing. The detection personnel arrive the scene with the transformer outage and install direct current transmission device on the neutral point of transformer, follow-up need not to get back to the scene again and dismantles direct current transmission device, only need control motor drive moving part to remove, just can realize the dismantlement of direct current transmission device, so, the detection personnel can reduce the number of times that is close to high pressure, the strong electromagnetic environment of transformer, has ensured detection personnel's personal safety.

Drawings

Fig. 1 is an assembly schematic diagram of a cable to be tested of a transformer when a dc current transmission device is in an open state according to an embodiment of the present invention;

fig. 2 is an assembly schematic diagram of the cable to be tested of the transformer when the dc current transmission device is in an open state according to the embodiment of the present invention;

fig. 3 is a schematic cross-sectional view along the section line III-III in fig. 2 according to an embodiment of the present invention;

fig. 4 is an assembly diagram of the cable to be tested of the transformer when the dc current transformer is in a closed state according to the embodiment of the present invention;

fig. 5 is an assembly diagram of the cable to be tested of the transformer when the dc current transformer is in a closed state according to the embodiment of the present invention;

fig. 6 is an enlarged schematic view of a VI-VI portion of the dc current transformer in fig. 3 according to an embodiment of the present invention;

fig. 7 is an assembly diagram of the cable to be tested of the transformer when the dc current transformer is in an open state according to the embodiment of the present invention;

fig. 8 is a schematic structural diagram of a transformer neutral point dc current testing system according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail by the following embodiments in combination with the accompanying drawings.

The embodiment of the utility model provides an in provide a direct current power transmission device 100, it can be used for being connected with the cable 200 that awaits measuring of transformer to gather the current parameter of transformer neutral point. The structure of the dc current transmission device 100 is shown in fig. 1 to 3, and includes a first housing 10, a second housing 20, a first hall sensor 30, a second hall sensor 40, and a motor assembly 50. The first hall sensor 30 and the motor assembly 50 are disposed in the first housing 10, and the second hall sensor 40 is disposed in the second housing 20.

The second housing 20 is movably connected with the first housing 10. As in the embodiment of fig. 3, the second housing 20 is reciprocally movable relative to the first housing 10 in both positive and negative directions of the X-axis. Referring to fig. 4 and 5, when the second housing 20 is close to the first housing 10, the second housing 20 and the first housing 10 form a through hole 21, the cable 200 to be tested of the transformer is inserted into the through hole 21, and the dc current transmission device 100 is fixed on the cable 200 to be tested of the transformer. Referring to fig. 1 and 3, when the second housing 20 is far away from the first housing 10, the second housing 20 and the first housing 10 form an opening 22, and the dc current transmission device 100 can be buckled into or taken out of the cable 200 to be tested from the opening 22.

The first hall sensor 30 is disposed in the first housing 10, and the second hall sensor 40 is disposed in the second housing 20. In one embodiment, the first hall sensor 30 is in the form of a cantilever and the second hall sensor 40 is in the form of a cantilever. When the two arms of the second hall sensor 40 move to contact with the two arms of the first hall sensor 30, the first hall sensor 30 and the second hall sensor 40 enter a test state to acquire a current parameter of the neutral point of the transformer. Specifically, based on the operating principle of the open-loop hall sensor, when a current passes through the cable 200 to be tested inserted into the through hole 21, a magnetic field whose magnetic field intensity is proportional to the magnitude of the current is generated around the cable 200 to be tested, and the first hall sensor 30 and the second hall sensor 40 convert the direct current of the cable 200 to be tested into direct current which is output in proportion. The current parameters include the magnitude and frequency of the direct current. When the second housing 20 is far away from the first housing 10, the first hall sensor 30 and the second hall sensor 40 exit the test state, that is, the first hall sensor 30 and the second hall sensor 40 no longer collect the current parameters of the cable 200 to be tested.

The motor assembly 50 includes a motor 51, a guide rod 52, and a movable member 53. The guide bar 52 is provided on the motor 51, and the movable piece 53 is provided on the guide bar 52. Guide rod 52 includes opposing first end 521 and second end 522, and first hall sensor 30 is disposed proximate first end 521. The movable member 53 is fixedly connected to the second housing 20, and the movable member 53 is configured to move between the first end 521 and the second end 522 when driven by the motor 51, and drive the second housing 20 to move relative to the first housing 10, so that the second hall sensor 40 can move relative to the first hall sensor 30.

Specifically, the first end 521 of the guide rod 52 is close to the first hall sensor 30, and the second end 522 is far away from the first hall sensor 30. When the motor 51 is operated, the movable member 53 can be driven by the motor 51 to move between the first end 521 and the second end 522. Since the second housing 20 is fixedly connected to the movable member 53, the movable member 53 can drive the second housing 20 to move between the first end 521 and the second end 522, so that the second housing 20 moves relative to the first housing 10, and thus, the second hall sensor 40 disposed in the second housing 20 can also move relative to the first hall sensor 30 disposed in the first housing 10.

In the above-mentioned dc current transmission device 100, the movable member 53 can move between the first end 521 and the second end 522 of the guide rod 52 when being driven by the motor 51, so as to drive the second housing 20 to move relative to the first housing 10. Based on this, the dc current transmission device 100 can be fastened to the cable 200 to be tested at the neutral point of the transformer when the second housing 20 is close to the first housing 10, can collect the current parameter at the neutral point of the transformer when the second hall sensor 40 and the first hall sensor 30 are close to each other, and can also be unfastened when the second housing 20 is far from the first housing 10. The detection personnel arrive the scene with the transformer outage and install direct current transmission device 100 on the neutral point of transformer, follow-up need not to get back to the scene again and dismantles direct current transmission device 100, only need control motor 51 drive moving part 53 to remove, just can realize the dismantlement of direct current transmission device 100, so, the detection personnel can reduce the number of times of being close to the high pressure of transformer, strong electromagnetic environment, ensured detection personnel's personal safety.

In one embodiment, the guide rod 52 is a screw rod, a first end 521 of the screw rod is connected to the motor 51, a second end 522 of the screw rod is connected to the first housing 10, and the movable member 53 is in threaded engagement with the screw rod. When the motor 51 controls the screw to rotate, the movable member 53 moves between the first end 521 and the second end 522, thereby moving the second housing 20 relative to the first housing 10.

In one embodiment, the motor 51 is a stepper motor. The rotating shaft of the stepper motor is coupled to the guide rod 52, and when the rotating shaft rotates, the guide rod 52 is rotated, such that the guide rod 52 moves the movable member 53 between the first end 521 and the second end 522. Since the linearity of the stepping motor is high, the stepping motor can precisely control the moving distance of the movable piece 53.

Referring to FIG. 6, in one embodiment, the movable member 53 includes a slider 531. The slider 531 is connected to the second housing 20 by means of, for example, engagement, gluing, or welding. When the motor 51 drives the slider 531 to move between the first end 521 and the second end 522, the slider 531 can directly drive the second housing 20 to move relative to the first housing 10, and the manner of driving the second housing 20 to move relative to the first housing 10 is simple.

Referring to fig. 6, in one embodiment, the movable member 53 includes a slider 531 and a sleeve 532, and the slider 531 and the sleeve 532 can move between the first end 521 and the second end 522. The sleeve 532 is fixedly connected to the second housing 20, and the slider 531 is used for moving the sleeve 532 between the first end 521 and the second end 522 when being driven by the motor 51, so that the second housing 20 can move relative to the first housing 10.

Specifically, the shaft sleeve 532 is connected to the second housing 20 by means of clamping, gluing, welding, or the like. When the motor 51 drives the slider 531 to move between the first end 521 and the second end 522, the slider 531 drives the sleeve 532 to move between the first end 521 and the second end 522, so that the sleeve 532 drives the second housing 20 to move relative to the first housing 10. Since the second housing 20 is fixedly connected to the sleeve 532, rather than directly connected to the slider 531, there is no need to provide a structure fixed to the second housing 20 on the slider 531, and only the sleeve 532 needs to be fixedly connected to the second housing 20, and the existing motor 51, the guide rod 52 and the slider 531 are used to drive the sleeve 532 to move, so as to drive the second housing 20 to move relative to the first housing 10, which is low in driving cost.

In one embodiment, the slider 531 and the sleeve 532 are both disposed on the guide rod 52. Under the restriction of the guide rod 52, the slider 531 and the bushing 532 only move the guide rod 52 between the first end 521 and the second end 522, so that the second housing 20 moves smoothly when moving relative to the first housing 10.

In another embodiment, the slider 531 is disposed on the guide rod 52, and the shaft sleeve 532 is disposed on the slider 531, for example, the shaft sleeve 532 is disposed on the outer side of the slider 531 away from the guide rod 52 to form a double-layer structure of the slider 531 and the shaft sleeve 532. In this way, only the sleeve 532 connected to the second housing 20 needs to be disposed on the slider 531, and the structure of the slider 531 does not need to be modified, and the second housing 20 can be driven to move relative to the first housing 10 by using the existing motor 51, the guide rod 52, and the slider 531, so that the driving cost is lower.

In one embodiment, the area of the boss 532 in contact with the second housing 20 is larger than the area of the slider 531 in contact with the second housing 20. In this manner, the coupling of the boss 532 to the second housing 20 is more reliable.

Referring to fig. 3 and 5, in one embodiment, the dc current transmission device 100 further includes an elastic member 60, and the elastic member 60 is connected to the first housing 10 and the second housing 20 in a stretching manner.

Specifically, one end of the elastic member 60 is fixedly connected to the first housing 10, and the other end is fixedly connected to the second housing 20. As shown in fig. 3, when the second casing 20 is far from the first casing 10, the elastic member 60 is in a stretched state, one end of the elastic member 60 applies a force in the negative X-axis direction to the first casing 10, and the other end applies a force in the positive X-axis direction to the second casing 20, so that the second casing 20 tends to move relative to the first casing 10. As shown in fig. 5, when the second housing 20 approaches the first housing 10, the elastic member 60 is in a balanced state or a slightly stretched state. In this way, the second housing 20 far from the first housing 10 can be moved close to the first housing 10 by using only the elastic member 60 without operating the driving motor 51, and electric energy is saved. In addition, when the connection between the shaft sleeve 532 sleeved on the guide rod 52 and the slider 531 fails, the motor 51 may drive the slider 531 to push the shaft sleeve 532 to move toward the second end 522, and the elastic element 60 may pull the second housing 20 to move toward the first housing 10, thereby ensuring that the dc current transmission device 100 can be opened and closed normally. In one embodiment, the elastic member 60 is a contraction spring.

Referring to fig. 3, in one embodiment, the dc current transmission device 100 further includes a limiting member 70, and when the movable member 53 approaches the second end 522, the limiting member 70 abuts against the movable member 53 so that the movable member 53 is limited at the second end 522. Specifically, when the movable member 53 approaches the second end 522, the limiting member 70 abuts against the movable member 53, so as to limit the movable member 53 at the second end 522. In this way, the second housing 20 and the first housing 10 can be kept in an open state, and the cable 200 to be tested of the transformer can be taken out or put in from the opening 22 between the second housing 20 and the first housing 10.

Referring to fig. 3 and fig. 6, in one embodiment, the position limiting member 70 includes a body 71 and a torsion spring 72, the torsion spring 72 is disposed on the first housing 10, the body 71 is disposed on the torsion spring 72, the body 71 is disposed with a position limiting protrusion 73, when the movable member 53 reaches the second end 522, the torsion spring 72 applies an elastic force to the body 71, so that the body 71 abuts against the movable member 53 along a direction perpendicular to the moving direction of the movable member 53, and the position limiting protrusion 73 abuts against the movable member 53 along the moving direction of the movable member 53.

Specifically, a torsion spring 72 is provided on the first housing 10, and the body 71 is connected to the torsion spring 72 and can rotate about a rotation center of the torsion spring 72. One or more limit protrusions 73 are provided on the body 71. As in the embodiment of fig. 6, two limiting protrusions 73 are provided on the body 71, one limiting protrusion 73 is provided at the middle of the body 71, and the other limiting protrusion 73 is provided at the end of the body 71 away from the rotational center of the torsion spring 72. When the movable element 53 moves from the first end 521 to the second end 522, the movable element 53 pushes the body 71 open, and when the movable element 53 reaches the second end 522, the torsion spring 72 applies an elastic force to the body 71, so that the body 71 applies a force to the movable element 53 in a direction perpendicular to the X axis, and the limit protrusion 73 applies a force to the movable element 53 in the X axis direction. Thus, under the common limitation of the body 71 and the limiting protrusion 73, the movable member 53 is limited at the second end 522, so that the second housing 20 and the first housing 10 are kept in the open state. Of course, as shown in fig. 5, when it is necessary to close the second housing 20 and the first housing 10, the motor 51 drives the movable element 53 again to open the main body 71 and the limiting protrusion 73, so that the movable element 53 moves from the second end 522 to the first end 521.

In another embodiment, the position limiter 70 may be a retraction spring disposed between the second end 522 of the guide rod 52 and the movable member 53. Specifically, one end of the retraction spring is coupled to the moveable member 53 and the opposite end is coupled to the second end 522 of the guide rod 52. When the movable member 53 moves to the first end 521, the contraction spring is in a stretched state, and a force in a direction (i.e., the X-axis negative direction) in which the first end 521 points to the second end 522 is applied to the movable member 53, so that the movable member 53 is pulled toward the second end 522, and the movable member 53 is restricted to a position close to the second end 522.

In one embodiment, the first and second housings 10 and 20 are made of a thermoplastic resin, such as a nylon 66 resin. Since the thermoplastic resin has good heat resistance, wear resistance, fatigue strength, rigidity, insulation property, and hydrophobicity, the first and second housings 10 and 20 made of the thermoplastic resin satisfy the requirements of the dc current transmission device 100 for electrical insulation and high and low temperature tests, and also satisfy the requirement for waterproofing.

In one embodiment, the outer surfaces of the first and second housings 10 and 20 are painted with white paint. In this manner, when the direct current transmission device 100 is installed outdoors, the white paint may reduce the absorption of heat by the first and second housings 10 and 20, so that the first and second hall sensors 30 and 40 inside are in a proper temperature environment.

Referring to fig. 3, in one embodiment, the dc current transmission device 100 further includes a controller 80. The controller 80 is configured to control the motor 51 to drive the movable member 53 between the first end 521 and the second end 522. When the movable member 53 moves to the first end 521, the controller 80 is further configured to control the first hall sensor 30 and the second hall sensor 40 to acquire a current parameter of the cable 200 to be tested and process the current parameter.

As shown in the embodiment of fig. 3, the controller 80 is installed in the first housing 10, and the controller 80 can control the motor 51 to drive the movable member 53 to move between the first end 521 and the second end 522, so as to control the relative movement of the first housing 10 and the second housing 20. In this way, the inspector can control the opening and closing of the first casing 10 and the second casing 20 by controlling the motor 51 through the controller 80 to complete the detachment or attachment of the dc current transmission device 100.

In addition, the controller 80 may also control the first hall sensor 30 and the second hall sensor 40 to jointly acquire the current parameter of the cable 200 to be tested of the transformer when the movable member 53 moves to the first end 521. The first hall sensor 30 and the second hall sensor 40 transmit the acquired current parameters of the cable 200 to be tested to the controller 80, and the controller 80 receives, stores and processes the current parameters. In one example, the first hall sensor 30 and the second hall sensor 40 convert a large current of the cable 200 to be measured into a small current, and the controller 80 processes the small current, for example, calibrates the small current of the secondary side to obtain a high-precision current parameter.

In one embodiment, controller 80 is integrated with multiple processors. The function of controlling the motor 51 to drive the moveable member 53 to move may be performed by a single processor, such as a Microprocessor (MCU). The function of controlling the first hall sensor 30 and the second hall sensor 40 to acquire the current parameter of the cable 200 to be tested of the transformer and the function of processing the current parameter may be completed by the above-mentioned processor, or may be completed by other processors, which is not limited herein.

In one embodiment, the controller 80 includes a Cortex-M3 processor. Because the Cortex-M3 processor has high integration, high performance, and low power consumption, the controller 80 is able to provide sufficient computational performance to handle the current parameters and provide good scalability.

Of course, the controller 80 may also be a control center disposed outside the first housing 10, such as a computer device, for receiving, storing and processing the current parameters of the cable 200 to be tested, which are to be collected by the first hall sensor 30 and the second hall sensor 40.

With continued reference to fig. 3, in one embodiment, the dc current transmission device 100 further includes a battery pack 90, the battery pack 90 is disposed in the first housing 10, and the battery pack 90 is used for supplying power to the motor 51.

The battery pack 90 and the motor 51 are both disposed on the first housing 10, the battery pack 90 is electrically connected to the motor 51, and the battery pack 90 can supply power to the motor 51 to enable the motor 51 to operate. The dc current transmission device 100 can normally operate for a long time without providing an additional power supply under the power supply support of the battery pack 90. Therefore, the direct current transmission device 100 can be put into a remote and complex environment to monitor the direct current of the neutral point of the transformer for a long time, and the application scene of the direct current transmission device 100 is expanded.

In one embodiment, the battery pack 90 is a lithium battery. Because the lithium battery has the advantages of high energy ratio, long cycle life, environmental protection and the like, the battery pack 90 has high energy efficiency, can be charged and discharged circularly, and can continuously provide electric energy for the direct current power transmission device 100.

In one embodiment, the dc current transmission device 100 further includes a power converter (not shown) electrically connected to the battery pack 90. The power converter is used to convert the electric energy in the battery pack 90 into a rated voltage to be supplied to the motor 51. In this manner, the motor 51 can operate normally at a rated voltage.

In one embodiment, the battery pack 90 and the power converter are electrically connected to the controller 80. The controller 80 is used to control whether the power converter converts the power of the battery pack 90 according to whether the motor 51 is running.

When the motor 51 is required to operate, the controller 80 controls the power converter to be turned on, and the power converter starts to convert the electric energy of the battery pack 90 to supply power to the motor 51. When the operation of the motor 51 is not required, the controller 80 controls the power converter to be turned off, and the power converter stops converting the power of the battery pack 90. In this way, the controller 80 controls whether the power converter converts the electric power of the battery pack 90 according to whether the motor 51 is operated, and the overall power consumption can be reduced.

In one embodiment, the battery pack 90 is also used to power the controller 80. Thus, the dc current transformer 100 can operate normally for a long time without providing an additional power supply.

Referring to fig. 7, in one embodiment, the dc current transmission device 100 further includes a rotation shaft base 110 and a handle 120, wherein the rotation shaft base 110 is disposed on the first casing 10 and rotatably connected to the handle 120, so that the first casing 10 can be fixed at different predetermined angles relative to the handle 120.

Specifically, one end of the rotation shaft base 110 is fixedly connected to the first housing 10, and the other end thereof is rotatably connected to the handle 120. The handle 120 can rotate relative to the spindle base 110 about a spindle (the spindle is parallel to the Y-axis in fig. 1), and can be fixed at different preset angles relative to the handle 120. Wherein, the angle between the first casing 10 and the handle 120 is defined as the included angle between the plane where the first casing 10 is connected with the rotating shaft base 110 and the center of the handle 120; the preset angle may be 30 degrees, 60 degrees, 90 degrees, 120 degrees, 150 degrees, etc., and is not limited herein. Thus, the inspector can adjust the angle between the first casing 10 and the handle 120 to a proper preset angle according to the actual situation of the site, so as to buckle the dc current transformer 100 on the cable 200 to be tested of the transformer.

In one embodiment, the handle 120 is a telescoping handle. Thus, the inspector can adjust the dc current transmission device 100 to a suitable length according to the actual situation of the site, so as to install the dc current transmission device 100 on the cable 200 to be tested of the transformer.

Referring to fig. 6, in one embodiment, the dc current transmission device 100 further includes a first position sensor 130 and a second position sensor 140, the first position sensor 130 is disposed at the first end 521, the second position sensor 140 is disposed at the second end 522, the first position sensor 130 is configured to send a first position signal when detecting that the second hall sensor 40 reaches the first end 521, the second position sensor 140 is configured to send a second position signal when detecting that the second hall sensor 40 reaches the second end 522, and the first position signal and the second position signal are used to determine the position of the second hall sensor 40.

Specifically, it can be determined that the second hall sensor 40 reaches the first end 521 according to the first position signal sent by the first position sensor 130, and at this time, the motor 51 must stop driving the movable member 53 to move continuously, so as to prevent the second housing 20 from pressing the first housing 10 excessively, and thus the structures of the first hall sensor 30 and the second hall sensor 40 are damaged. The second hall sensor 40 can be judged to reach the second end 522 according to the second position signal sent by the second position sensor 140, and the motor 51 must stop driving the moving member 53 to move continuously, so as to prevent the second housing 20 from stretching the first housing 10 excessively. Thus, the position of the second hall sensor 40 is determined according to the first position signal and the second position signal, so that the motor 51 can be prevented from excessively driving the movable member 53 to move, the moving range of the movable member 53 exceeds the range between the first end 521 and the second end 522, and the structures of the first housing 10, the second housing 20, the first hall sensor 30, the second hall sensor 40 and the like are damaged.

In one embodiment, the first position sensor 130 and the second position sensor 140 are electrically connected to the controller 80. The controller 80 determines that the second hall sensor 40 reaches the first end 521 according to the first position signal sent by the first position sensor 130, so as to control the motor 51 to stop working. At this time, the controller 80 may also control the first hall sensor 30 and the second hall sensor 40 to acquire the current parameter of the cable 200 to be tested of the transformer. The controller 80 can also judge that the second hall sensor 40 reaches the second end 522 according to the second position signal sent by the second position sensor 140, so as to control the motor 51 to stop working. At this time, the controller 80 may also issue a prompt to take out or install the cable 200 to be tested, so that the tester can take out or install the cable 200 to be tested.

In another embodiment, the controller 80 can also determine whether the motor 51 is locked by determining whether the movable member 53 normally reaches the first end 521 or the second end 522 by determining the time when the first position signal is sent and the time when the second position signal is sent. For example, a preset time is set, when the time period between the sending of the first position signal and the sending of the second position signal exceeds the preset time, the controller 80 determines that the motor 51 is locked, and sends a prompt to notify the detection personnel of timely maintenance.

Referring to fig. 8, an embodiment of the present invention further provides a system 1000 for testing a neutral point dc current of a transformer. The transformer neutral point dc test system 1000 is applied to a transformer, and includes the dc current transmission device 100 according to any of the embodiments and the display device 300 connected to the dc current transmission device 100.

The dc current transmission device 100 further includes a controller 80, wherein the controller 80 is configured to control the motor 51 to drive the movable member 53 between the first end 521 and the second end 522. When the moving member 53 moves to the first end 521, the second housing 20 and the first housing 10 are fastened to the cable 200 to be tested of the transformer, and the controller 80 is further configured to control the first hall sensor 30 and the second hall sensor 40 to acquire the current parameter of the cable 200 to be tested. The controller 80 is also used for processing the current parameter and sending the current parameter to the display device 300, and the display device 300 is used for displaying the current parameter.

Specifically, the controller 80 can control the motor 51 to drive the movable member 53 to move between the first end 521 and the second end 522, thereby controlling the relative movement of the first housing 10 and the second housing 20. When the movable member 53 moves to the first end 521, the controller 80 may further control the first hall sensor 30 and the second hall sensor 40 to jointly acquire a current parameter of the cable 200 to be tested of the transformer. In addition, the controller 80 may also process the current parameters and store the current parameters to form historical monitoring data. The controller 80 sends the processed current parameters to the display device 300, and the display device 300 displays the current parameters in the forms of characters, graphs, icons and the like after receiving the current parameters, so that a detector can intuitively monitor the direct current change of the neutral point of the transformer according to the displayed current parameters.

In the transformer neutral point dc current testing system 1000, the movable member 53 can move between the first end 521 and the second end 522 of the guide rod 52 when being driven by the motor 51, so as to drive the second housing 20 to move relative to the first housing 10. Based on this, the dc current transmission device 100 can be fastened to the cable 200 to be tested at the neutral point of the transformer when the second housing 20 is close to the first housing 10, can collect the current parameter at the neutral point of the transformer when the second hall sensor 40 and the first hall sensor 30 are close to each other, and can also be unfastened when the second housing 20 is far from the first housing 10. The detection personnel arrive the scene with the transformer outage and install direct current transmission device 100 on the neutral point of transformer, follow-up need not to get back to the scene again and dismantles direct current transmission device 100, only need control motor 51 drive moving part 53 to remove, just can realize the dismantlement of direct current transmission device 100, so, the detection personnel can reduce the number of times of being close to the high pressure of transformer, strong electromagnetic environment, ensured detection personnel's personal safety. In addition, the dc current transmission device 100 can process the current parameter and transmit the current parameter to the display device 300, so that the inspector can check the current parameter through the display device 300, thereby monitoring the dc current change of the neutral point of the transformer.

With continued reference to fig. 8, in one embodiment, the display device 300 includes a display screen 310, and the transformer neutral point dc test system 1000 further includes a computer program for controlling the display screen 310 to display the current parameter. The display screen 310 may be a separate display panel, or may be a display panel disposed on an electronic device, where the electronic device may be a mobile phone, a tablet, a computer, or the like. Taking a mobile phone as an example, the computer program is installed on the mobile phone. When the computer program is running, the display screen 310 displays the current parameters of the transformer neutral. In addition, the computer program can be used to control the display screen 310 to display the running state of the motor 51, the equipment information of the dc current transmission device 100, the historical monitoring data and other information, so that the detection personnel can perform corresponding operations on the monitoring of the transformer according to the information.

In one embodiment, the transformer neutral dc test system 1000 further comprises an input device, which is connected to the controller 80. The input device is used for inputting preset operations of the direct current transmission device 100, wherein the preset operations include controlling the motor 51 to be turned on and off, controlling the direct current transmission device 100 to be started or stopped to monitor the cable 200 to be tested, and referring to historical monitoring data. The input device may be a key, a display screen with a touch function, or the like. In one example, the input device is the display 310 of the electronic apparatus in the above-described embodiment. In this way, the display device 300 and the input device can remotely control the dc current transmission device 100.

Referring to fig. 8, in an embodiment, the transformer neutral point dc test system 1000 further includes a communication device 400, the communication device 400 is communicatively connected to the controller 80 and the display device 300 respectively, and the communication device 400 is configured to transmit the current parameter processed by the controller 80 to the display device 300.

Specifically, the communication device 400 may be a cable communication device, a Wi-Fi communication device, a bluetooth communication device, or a 4G mobile communication device. The controller 80 sends the processed current parameters to the display device 300 through the communication device 400, so that the detection personnel can be far away from dangerous environments such as high voltage and strong magnetic field of the transformer, the current parameter change of the neutral point of the transformer can be monitored in real time through the display device 300, and the personal safety of the detection personnel is guaranteed.

With continued reference to fig. 8, in one embodiment, the transformer neutral dc test system 1000 further includes a peripheral storage device 500. The current parameters may be stored on the controller 80 or on the storage device 500. When the installation site is unattended, the storage device 500 of the external device can also be used for storing historical monitoring, so that detection personnel can conveniently read historical monitoring data.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features. The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A direct current transmission device is characterized by comprising a first shell, a second shell, a first Hall sensor, a second Hall sensor and a motor assembly, wherein the first Hall sensor and the motor assembly are arranged in the first shell, and the second Hall sensor is arranged in the second shell;

the motor assembly comprises a motor, a guide rod arranged on the motor and a moving part arranged on the guide rod, the guide rod comprises a first end and a second end which are opposite, the first Hall sensor is arranged close to the first end, the moving part is fixedly connected with the second shell, and the moving part is used for moving between the first end and the second end when being driven by the motor and driving the second shell to move relative to the first shell, so that the second Hall sensor can move relative to the first Hall sensor.

2. The dc current transmission device according to claim 1, wherein the movable member is a slider; or

The movable piece comprises a sliding block and a shaft sleeve, the sliding block and the shaft sleeve can move between the first end and the second end, the shaft sleeve is fixedly connected with the second shell, and the sliding block is used for driving the shaft sleeve to move between the first end and the second end when driven by the motor, so that the second shell can move relative to the first shell.

3. The dc current transducer according to claim 2, further comprising elastic members in tensile contact with the first housing and the second housing, respectively.

4. The dc current transmission device according to claim 1, further comprising a limiting member, wherein when the movable member approaches the second end, the limiting member abuts against the movable member to limit the movable member at the second end.

5. The direct current transducer according to claim 4, wherein the stopper includes a body and a torsion spring, the torsion spring is disposed on the first housing, the body is disposed on the torsion spring, a stopper protrusion is disposed on the body, and when the moving member reaches the second end, the torsion spring applies an elastic force to the body so that the body abuts against the moving member in a direction perpendicular to the moving member, and the stopper protrusion abuts against the moving member in a direction in which the moving member moves.

6. The dc current transducer according to any one of claims 1 to 5, further comprising a battery pack disposed in the first housing, the battery pack being configured to power the motor.

7. The apparatus according to any one of claims 1 to 5, further comprising a shaft base and a handle, wherein the shaft base is disposed on the first housing and is rotatably connected to the handle, so that the first housing can be fixed at different predetermined angles with respect to the handle.

8. The apparatus according to any one of claims 1 to 5, further comprising a first position sensor disposed at the first end and a second position sensor disposed at the second end, wherein the first position sensor is configured to send a first position signal when detecting that the second Hall sensor reaches the first end, wherein the second position sensor is configured to send a second position signal when detecting that the second Hall sensor reaches the second end, and wherein the first position signal and the second position signal are used to determine a position of the second Hall sensor.

9. A transformer neutral point direct current test system is applied to a transformer and is characterized by comprising a direct current transmission device as claimed in any one of claims 1 to 8 and a display device connected with the direct current transmission device; the direct current transmission device further comprises a controller, and the controller is used for controlling the motor to drive the movable piece to move between the first end and the second end;

when the moving part moves to the first end, the second shell and the first shell are buckled on a cable to be tested of the transformer, and the controller is further used for controlling the first Hall sensor and the second Hall sensor to acquire current parameters of the cable to be tested;

the controller is also used for processing the current parameters and sending the current parameters to the display device, and the display device is used for displaying the current parameters.

10. The transformer neutral point direct current test system according to claim 9, further comprising a communication device, wherein the communication device is in communication connection with the controller and the display device, respectively, and the communication device is configured to send the current parameters processed by the controller to the display device.

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