CN209911439U - 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 shell, a first Hall sensor, a second Hall sensor and a driving assembly. The casing includes first casing, second casing and third casing, and first casing is relative with the second casing, first casing and third casing fixed connection, second casing and third casing swing joint. The first Hall sensor, the second Hall sensor and the driving assembly are sequentially arranged in the first shell, the second shell and the third shell. The driving assembly comprises a motor and a first rotating piece connected with the motor, and the first rotating piece is in transmission connection with the second shell. The first rotating piece is used for rotating when being driven by the motor so as to drive the second shell to move relative to the first shell, and the second Hall sensor is close to or far away from the first Hall sensor. The device can be installed or disassembled only by controlling the motor to drive the first rotating member to rotate, and personal safety of detection personnel is guaranteed.

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 shell, a first Hall sensor, a second Hall sensor and a driving assembly;

the shell comprises a first shell, a second shell and a third shell, the first shell is opposite to the second shell, the first shell is fixedly connected with the third shell, and the second shell is movably connected with the third shell; the first Hall sensor is arranged in the first shell, the second Hall sensor is arranged in the second shell, and the driving assembly is arranged in the third shell; the driving assembly comprises a motor and a first rotating piece, the motor is connected with the first rotating piece, and the first rotating piece is in transmission connection with the second shell; the first rotating piece is used for rotating when being driven by the motor so as to drive the second shell to move relative to the first shell, so that the second Hall sensor is close to or far away from the first Hall sensor.

In the direct current transmission device, a first rotating member in the driving assembly is connected with the motor and is in transmission connection with the second shell, and when the motor is driven, the first rotating member rotates to drive the second shell to move relative to the first shell, so that the direct current transmission device can be installed on a cable to be tested of a neutral point of the transformer when the second shell is close to the first shell, and can collect current parameters of the neutral point of the transformer when the second hall sensor and the first hall sensor are close to each other; the cable to be tested of the neutral point of the transformer can be loosened when the second shell is far away from the first shell. Therefore, the detecting personnel only need to cut off the power of the transformer on the site and install the direct current transmission device on the neutral point of the transformer, follow-up direct current transmission device disassembly on the site is not needed to be returned, the direct current transmission device disassembly or re-installation can be realized only by controlling the first rotating member driven by the motor to rotate, the detecting personnel can reduce the times of high-voltage and strong electromagnetic environments close to the transformer, and the personal safety of the detecting personnel is guaranteed.

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 a closed 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 view illustrating an assembly of the dc current transformer and a cable to be tested of the transformer when the dc current transformer is in a closed state according to another embodiment of the present invention;

fig. 4 is a schematic view illustrating an assembly of the dc current transformer and a cable to be tested of the transformer when the dc current transformer is in an open state according to another embodiment of the present invention;

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

fig. 6 is a schematic view illustrating an assembly of the dc current transformer and a cable to be tested of the transformer when the dc current transformer is in an open state according to another embodiment of the present invention;

fig. 7 is a schematic view illustrating an assembly of the dc current transformer and a cable to be tested of the transformer when the dc current transformer is in an open state according to another 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 and 2, and includes a housing 10, a first hall sensor 20, a second hall sensor 30, and a driving assembly 40.

The housing 10 includes a first housing 11, a second housing 12, and a third housing 13. The first shell 11 is opposite to the second shell 12, the first shell 11 is fixedly connected with the third shell 13, and the second shell 12 is movably connected with the third shell 13. As in the embodiment of fig. 1, the second housing 12 is movable along the X-axis within a range relative to the first housing 11. Referring to fig. 1, when the second housing 12 contacts the first housing 11 and is defined as the minimum moving position of the second housing 12, the second housing 12 and the first housing 11 form a through hole 14, the cable 200 to be tested of the transformer is inserted into the through hole 14, and the dc current transformer 100 is fixed on the cable 200 to be tested of the transformer. Referring to fig. 2, when the second housing 12 is far away from the first housing 11, the second housing 12 and the first housing 11 form an opening 15. Until the second casing 12 cannot be further away from the first casing 11, the maximum moving position of the second casing 12 is defined, in which the aperture of the opening 15 is larger than the diameter of the cable 200 to be tested, and at this time, the dc current transmitting device 100 can buckle or take out the cable 200 to be tested from the opening 15.

The first hall sensor 20 is disposed in the first housing 11, and the second hall sensor 30 is disposed in the second housing 12. In one embodiment, the first hall sensor 20 is in the form of a cantilever and the second hall sensor 30 is in the form of a cantilever. When the two arms of the second hall sensor 30 move to contact with the two arms of the first hall sensor 20, the first hall sensor 20 and the second hall sensor 30 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 14, 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 20 and the second hall sensor 30 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 12 is far away from the first housing 11, the first hall sensor 20 and the second hall sensor 30 exit the test state, that is, the first hall sensor 20 and the second hall sensor 30 no longer collect the current parameters of the cable 200 to be tested.

The drive assembly 40 is disposed within the third housing 13. The driving assembly 40 includes a motor 41 and a first rotating member 42. The motor 41 is connected to the first rotating member 42, and the first rotating member 42 is drivingly connected to the second housing 12. The first rotating member 42 is configured to rotate when driven by the motor 41 to move the second housing 12 relative to the first housing 11, so that the second hall sensor 30 is close to or away from the first hall sensor 20.

Specifically, the motor 41 is connected to the first rotating member 42 to drive the first rotating member 42 to rotate. As shown in fig. 1, the first rotating member 42 rotates clockwise or counterclockwise perpendicular to the paper. The first rotating member 42 is in driving connection with the second housing 12, such as a gear driving connection, a friction driving connection, a belt driving connection, a chain driving connection, etc., so that the rotation of the first rotating member 42 can be converted into the linear movement of the second housing 12. When the first rotating member 42 rotates, the first rotating member 42 can drive the second casing 12 to move along a predetermined direction (such as the positive direction and the negative direction of the X-axis shown in fig. 1), so that the second casing 12 moves relative to the first casing 11. In this way, the second hall sensor 30 provided in the second housing 12 can also move relative to the first hall sensor 20 provided in the first housing 11.

In the above dc current transmission device, the first rotating member 42 of the driving assembly 40 is connected to the motor 41 and is in transmission connection with the second casing 12. When the motor 41 is driven, the first rotating member 42 rotates to drive the second housing 12 to move relative to the first housing 11, so that the dc current transmission device 100 can be installed on the cable 200 to be tested at the neutral point of the transformer when the second housing 12 approaches the first housing 11, and can acquire the current parameter at the neutral point of the transformer when the second hall sensor 30 and the first hall sensor 20 approach each other; the cable 200 to be tested of the neutral point of the transformer can be loosened when the second housing 12 is far away from the first housing 11. Therefore, the detecting personnel only need to cut off the power of the transformer on site and install the direct current transmission device 100 on the neutral point of the transformer, follow-up disassembly of the direct current transmission device 100 on site is not needed, the direct current transmission device 100 can be disassembled or reinstalled only by controlling the motor 41 to drive the first rotating member 42 to rotate, the detecting personnel can reduce the times of high-voltage and strong electromagnetic environments close to the transformer, and the personal safety of the detecting personnel is guaranteed.

Referring to fig. 1 and fig. 2, in one embodiment, the first rotating member 42 includes a first transmission portion 421, the second housing 12 includes a second transmission portion 121, and the second transmission portion 121 is configured to be in transmission connection with the first transmission portion 421.

Specifically, a second transmission portion 121 is formed on a side wall of the second casing 12, and the second transmission portion 121 is in transmission connection with the first transmission portion 421 on the first rotating member 42, so that the first rotating member 42 can drive the second casing 12 to move along a preset direction when rotating.

Referring to fig. 1 and fig. 2, in one embodiment, the first rotating member 42 is a gear, and the first transmission part 421 and the second transmission part 121 are both gear teeth.

The first rotating member 42 is in meshing transmission connection with the second housing 12. Specifically, the first rotating member 42 is a gear, and gear teeth are formed on an outer side wall of the first rotating member 42 and also formed on an outer side wall of the second housing 12. The teeth of the gear are engaged with the teeth of the second housing 12, so that the first rotating member 42 can drive the second housing 12 to move along the predetermined direction when rotating.

In another embodiment, the first rotating member 42 is a friction wheel, the first transmission part 421 is an outer sidewall of the friction wheel, and the second transmission part 121 is an outer sidewall of the second housing 12.

The first rotating member 42 is in frictional driving connection with the second housing 12. Specifically, the first rotating member 42 is a friction wheel, the first transmission part 421 is formed on an outer side wall of the friction wheel, and the second transmission part 121 is formed on an outer side wall of the second housing 12. The outer side wall of the friction wheel and the outer side wall of the second housing 12 rub against each other, so that the first rotating member 42 can drive the second housing 12 to move along the predetermined direction when rotating.

Referring to fig. 3 and 4, in one embodiment, the driving assembly 40 further includes a second rotating member 43 and a transmitting member 44. The first rotating member 42 is disposed in the third housing 13 at a position distant from the first hall sensor 20, and the second rotating member 43 is disposed in the third housing 13 at a position close to the first hall sensor 20. The transmission member 44 is sleeved on the first rotating member 42 and the second rotating member 43 and connected with the second housing 12. The first rotating member 42 is configured to rotate when driven by the motor 41, so as to drive the transmitting member 44 to move between the first rotating member 42 and the second rotating member 43, and the transmitting member 44 drives the second housing 12 to move relative to the first housing 11.

Specifically, since the transmission member 44 is sleeved on the first rotation member 42 and the second rotation member 43, when the motor 41 works, the motor 41 drives the first rotation member 42 to rotate, the first rotation member 42 rotates to drive the transmission member 44 to move, and the second rotation member 43 is a driven wheel, so that the transmission member 44 moves between the first rotation member 42 and the second rotation member 43. Here, since the first rotating member 42 is far from the first hall sensor 20 and the second rotating member 43 is close to the first hall sensor 20, the position of the second rotating member 43 can be preset to the minimum moving position of the second housing 12, and the position of the first rotating member 42 can be preset to the maximum moving position of the second housing 12. Since the transmission member 44 is also connected to the second housing 12, when the transmission member 44 moves along the first rotation member 42 and the second rotation member 43, the transmission member 44 can move the second housing 12 between the minimum movement position and the maximum movement position relative to the first housing 11. In this way, the second hall sensor 30 provided in the second housing 12 can also move relative to the first hall sensor 20 provided in the first housing 11.

Referring to fig. 3, in one embodiment, the first rotating member 42 and the second rotating member 43 are both fixed pulleys, and the transmission member 44 includes a transmission rope or a belt. In this way, under the friction force between the transmission member 44 and the first rotation member 42 and the second rotation member 43, when the second rotation member 43 rotates, the transmission member 44 can be driven to move between the first rotation member 42 and the second rotation member 43, so as to drive the second housing 12 to move relative to the first housing 11.

In one embodiment, the first rotating member 42 and the second rotating member 43 are both sprockets, and the conveying member 44 is a chain. In this way, the transmitting member 44 can be engaged with the first rotating member 42 and the second rotating member 43, respectively. When the second rotating member 43 rotates, the transmitting member 44 can be driven to move between the first rotating member 42 and the second rotating member 43, so as to drive the second housing 12 to move relative to the first housing 11.

Referring to fig. 3 and 4, in one embodiment, the transmission member 44 includes a first sub-transmission member 441, and the first sub-transmission member 441 is sleeved on the first rotation member 42 and the second rotation member 43. One end of the first sub-transmitting member 441 is connected to the second housing 12, and the first sub-transmitting member 441 is configured to move when the second rotating member 42 rotates, so as to drive the second housing 12 to move relative to the first housing 11. The dc current transmission device 100 further includes a first torsion spring 50. The first torsion spring 50 is disposed on the second housing 12, and one arm of the first torsion spring 50 is connected to the other end of the first sub-transmitting member 441. The other arm of the first torsion spring 50 is provided with a first fixing portion 51, and the first housing 11 is provided with a first coupling portion 111. When the second housing 12 approaches the first housing 11, the first fixing portion 51 is coupled to the first coupling portion 111.

Specifically, as shown in fig. 3, the first sub-transmitting member 441 is sleeved on the first rotating member 42 and the second rotating member 43, and when the first rotating member 42 rotates, the first sub-transmitting member 441 moves between the first rotating member 42 and the second rotating member 43. One end of the first sub-transmitting member 441 is connected to the second housing 12, so that the first sub-transmitting member 441 drives the second housing 12 to move relative to the first housing 11 when moving.

The first torsion spring 50 is provided on the second housing 12. The first torsion spring 50 includes two arms, and one arm of the first torsion spring 50 is connected to the other end of the first sub-transmitting member 441, so that the first sub-transmitting member 441 can pull the arm of the first torsion spring 50 to rotate the first torsion spring 50 when moving. The other arm of the first torsion spring 50 is provided with a first fixing portion 51, and the first housing 11 is provided with a first coupling portion 111.

Referring to fig. 4, when the second housing 12 is far away from the first housing 11, the first rotating member 42 rotates clockwise, the first sub-transmitting member 441 stretches one arm of the first torsion spring 50, and the first torsion spring 50 rotates, such that the first fixing portion 51 on the other arm of the first torsion spring 50 is relatively far away from the first combining portion 111. Referring to fig. 3, when the second housing 12 is close to the first housing 11, the first rotating member 42 rotates counterclockwise, the first sub-transmitting member 441 releases one arm of the first torsion spring 50, and the first torsion spring 50 does not rotate or rotates to a smaller extent, so that the first fixing portion 51 on the other arm of the first torsion spring 50 can be relatively close to the first combining portion 111, and the first fixing portion 51 is combined with the first combining portion 111. Under the limitation of the first fixing portion 51 and the first combining portion 111, the second housing 12 is not easily separated from the first housing 11, which is beneficial to continuously collecting the current parameters of the to-be-measured cable 200 of the transformer by the first hall sensor 20 and the second hall sensor 30.

Referring to fig. 3, in one embodiment, the first fixing portion 51 is a protrusion, and the first combining portion 111 is a groove. Thus, when the second housing 12 is close to the first housing 11, the protrusion of the second torsion spring 50 extends into the groove of the second housing 12, so that the second housing 12 and the first housing 11 are firmly closed. In another embodiment, the first fixing portion 51 is a groove, and the first combining portion 111 is a protrusion. Thus, when the second housing 12 is close to the first housing 11, the protrusion of the second housing 12 extends into the groove of the second torsion spring 50, so that the second housing 12 and the first housing 12 are firmly closed.

Referring to fig. 3 and 4, in one embodiment, the driving assembly 40 further includes a third rotating member 45, and the dc current transmission device 100 further includes a second torsion spring 60. The third rotating member 45 is provided on the second housing 12 at a position close to the first torsion spring 50, and the second torsion spring 60 is provided on the second housing 12 at a position far from the first torsion spring 50. The transmission member 44 further includes a second sub-transmission member 442, and the second sub-transmission member 442 is sequentially sleeved on the first rotation member 42, the second rotation member 43 and the third rotation member 43. One end of the second sub-transmitting member 442 is connected to the second housing 12, and the other end of the second sub-transmitting member 442 is connected to an arm of the second torsion spring 60, the second sub-transmitting member 442 being adapted to move when the second rotating member 42 rotates. The other arm of the second torsion spring 60 is provided with a second fixing portion 61, and the first housing 11 is provided with a second combining portion 112. When the second housing 12 approaches the first housing 11, the second fixing portion 61 is coupled to the second coupling portion 112.

Specifically, the third rotating member 45 is provided on the second housing 12 in proximity to the first torsion spring 50. The second sub-transmitting member 442 is disposed on the first rotating member 42, the second rotating member 43 and the third rotating member 45. When the second rotating member 43 rotates, the second sub-transmitting member 442 moves, thereby rotating the second rotating member 43 and the third rotating member 45. One end of the second sub-transmitting member 442 is connected to the second housing 12, and when the second sub-transmitting member 442 moves, the second sub-transmitting member 442 can drive the second housing 12 to move relative to the first housing 11.

The second torsion spring 60 is disposed on the second housing 12 and away from the first torsion spring 50. The second torsion spring 60 includes two arms, and one arm of the second torsion spring 60 is connected to the other end of the second sub-transmitting member 442, so that when the second sub-transmitting member 442 moves, the arm of the second torsion spring 60 is pulled to rotate the second torsion spring 60. The other arm of the second torsion spring 60 is provided with a second fixing portion 61, and the first housing 11 is provided with a second combining portion 112.

Referring to fig. 4, when the second housing 12 is far away from the first housing 11, the first rotating member 42 rotates clockwise, the second sub-transmitting member 442 stretches one arm of the second torsion spring 60, and the second torsion spring 60 rotates, such that the second fixing portion 61 on the other arm of the second torsion spring 60 is relatively far away from the second combining portion 112. Referring to fig. 3, when the second housing 12 is close to the first housing 11, the first rotating member 42 rotates counterclockwise, the second sub-transmitting member 442 releases one arm of the second torsion spring 60, the second torsion spring 60 does not rotate or rotates less, so that the second fixing portion 61 on the other arm of the second torsion spring 60 can be relatively close to the second combining portion 112, and the second fixing portion 61 can be combined with the second combining portion 112. Under the limitation of the second fixing portion 61 and the second combining portion 112, the second housing 12 is not easily separated from the first housing 11, which is beneficial to continuously collecting the current parameters of the to-be-measured cable 200 of the transformer by the first hall sensor 20 and the second hall sensor 30.

Referring to fig. 3, in one embodiment, the second fixing portion 61 is a protrusion, and the second combining portion 112 is a protrusion. In this way, when the second housing 12 approaches the first housing 11, the protrusion of the second torsion spring 50 is abutted against the protrusion of the second housing 12, so that the second housing 12 and the first housing 11 are firmly closed.

Referring to fig. 3 and 4, in one embodiment, an end of the second sub-transmitting member 442 connected to the second housing 12 coincides with an end of the first sub-transmitting member 441 connected to the second housing 12, so that the second sub-transmitting member 442 and the first sub-transmitting member 441 can move synchronously when the first rotating member 42 rotates, so that the second housing 12 can move smoothly relative to the first housing 11.

Referring to fig. 3 and 4, in one embodiment, the conveying member 44 further includes a third sub-conveying member 443. The third sub-transmitting member 443 is sleeved on the first rotating member 42 and the second rotating member 43. The third sub-conveyer 443 includes a fixed end 4431 and a free end 4432, the fixed end 4431 is fixedly connected with the second housing 12, and the third sub-conveyer 443 is moved to move the second housing 12 relative to the first housing 11 when the free end 4432 is manually moved.

Specifically, when the motor 41 fails, for example, the motor 41 is locked, the motor 41 is excessively rotated to press or pull the second casing 12 against the first casing 11, the inspector may manually pull the free end 4432 of the third sub-conveyor 443 to move the second casing 12 relative to the first casing 11, so as to improve the reliability of the dc current conveyor 100.

In one embodiment, the end of the first sub transferring member 441 connected to the second housing 12, the end of the second sub transferring member 442 connected to the second housing 12, and the fixed end 4431 of the third sub transferring member 443 coincide, so that the first sub transferring member 441, the second sub transferring member 442, and the third sub transferring member 443 can move synchronously when the second rotating member 42 rotates, so that the second housing 12 can move smoothly relative to the first housing 11.

Referring to fig. 5 and 6, in one embodiment, the dc current transmission device 100 further includes a limiting member 70. The limiting member 70 includes a first end 71 and a second end 72 opposite to each other, the first end 71 is fixedly connected to the first housing 11, and the second end 72 is movably disposed on the second housing 12. When the second housing 12 is close to the first housing 11, the second end 72 abuts against the outer side of the second housing 12. The second end 72 pulls the inside edge of the second housing 12 when the second housing 12 is away from the first housing 11.

Specifically, referring to fig. 5, when the second housing 12 moves to abut against the first housing 11, the second end 72 of the limiting member 70 abuts against the outer side of the second housing 12, so as to prevent the motor 41 from rotating excessively, and prevent the second housing 12 from continuing to approach the first housing 11 to excessively press the first housing 11. Referring to fig. 6, when the second housing 12 moves to the maximum moving position, the second end 72 of the limiting member 70 holds the inner side of the second housing 12, so as to prevent the second housing 12 from continuously moving away from the first housing 11 to excessively pull the first housing 11.

In one embodiment, the position limiting member 70 is a side guard plate with certain rigidity to limit the moving position of the second housing 12 relative to the first housing 11.

In another embodiment, the limiting member 70 may be replaced by an elastic member, and two ends of the elastic member are respectively connected to the first housing 11 and the second housing 12 in a stretching manner. Specifically, one end of the elastic member is fixedly connected to the first housing 11, and the other end is fixedly connected to the second housing 12. The elastic member is in a stretched state so that the second housing 12 tends to move relative to the first housing 11. In this way, the elastic member can prevent the second housing 12 from exceeding the maximum movement position and excessively pulling the first housing 11. In one embodiment, the resilient member is a retraction spring.

Referring to fig. 7, in one embodiment, the dc current transmission device 100 further includes a controller 80. The controller 80 is electrically connected to the motor 41, and the controller 80 is configured to send a control signal, where the control signal is used to control the motor 41 to drive the first rotating member 42 to rotate.

In one embodiment, the controller 80 may be mounted within the third housing 13. Therefore, the inspector can control the motor 41 through the controller 80 to control the opening or closing of the first shell 11 and the second shell 12 to complete the dismounting or mounting of the dc current transmission device 100, so that the inspector can reduce the times of high-voltage and strong electromagnetic environments close to the transformer, and the personal safety of the inspector is guaranteed.

In addition, the controller 80 may also control the first hall sensor 20 and the second hall sensor 30 to jointly acquire the current parameter of the cable 200 to be tested of the transformer when the second housing 12 moves to be close to the first housing 11. The first hall sensor 20 and the second hall sensor 30 transmit the acquired current parameter of the cable 200 to be tested to the controller 80, and the controller 80 receives, stores and processes the current parameter. In one example, the first hall sensor 20 and the second hall sensor 30 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 on 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 41 to drive the first rotating member 42 to rotate may be performed by a single processor, such as a Micro Controller Unit (MCU). The function of controlling the first hall sensor 20 and the second hall sensor 30 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 third housing 13, such as a computer device, for receiving, storing and processing the current parameters of the cable 200 to be tested to be collected by the first hall sensor 20 and the second hall sensor 30.

Referring to fig. 1 and 2, in one embodiment, the dc current transmission device 100 further includes a first position sensor 90 and a second position sensor 110. The first position sensor 90 is provided on the third housing 13 at a position close to the first hall sensor 20, and the second position sensor 110 is provided on the third housing 13 at a position far from the first hall sensor 20. The first position sensor 90 and the second position sensor 110 are electrically connected to the controller 80, respectively. The first position sensor 90 is used for sending a first position signal to the controller 80 when the second hall sensor 30 is close to the first position sensor 90, the second position sensor 110 is used for sending a second position signal to the controller 80 when the second hall sensor 30 is close to the second position sensor 110, and the controller 80 controls the motor 41 to stop working according to the first position signal and the second position signal.

Specifically, referring to fig. 1, when the second housing 12 moves to contact the first housing 11, the first position sensor 90 is triggered to send a first position signal. According to the first position signal sent by the first position sensor 90, the controller 80 can determine that the second hall sensor 30 has contacted the first hall sensor 20, and control the motor 41 to stop working, so as to prevent the first rotating member 42 from continuing to rotate and driving the second housing 12 to move, and prevent the second housing 12 from excessively pressing the first housing 11, which results in the structure of the first hall sensor 20 and the second hall sensor 30 being damaged.

Referring to fig. 2, when the second housing 12 moves to the maximum movable position, the second position sensor 110 is triggered to send a second position signal. According to the second position signal sent by the second position sensor 110, the controller 80 can determine that the second hall sensor 30 has been away from the first hall sensor 20, and at this time, the control motor 41 stops working, so as to prevent the first rotating member 42 from continuing to rotate and driving the second housing 12 to move, which results in the second housing 12 stretching the first housing 11 excessively.

In this way, the position of the second hall sensor 30 can be determined according to the first position signal and the second position signal, and the motor 41 can be prevented from excessively driving the first rotating member 42 to rotate, so that the second housing 12 moves beyond the movable range, and the structures of the first housing 11, the second housing 12, the first hall sensor 20, the second hall sensor 30, and the like are damaged.

Referring to fig. 1 and 2, in one embodiment, the first rotating member 42 is in engagement transmission connection or friction transmission connection with the second housing 12, the first position sensor 90 and the second position sensor 110 are respectively located at two sides of the first rotating member 42, the first position sensor 90 corresponds to the minimum moving position of the second housing 12, and the second position sensor 110 corresponds to the maximum moving position of the second housing 12. Referring to fig. 3 and 4, in another embodiment, the first rotating member 42 is in belt-driven or chain-driven connection with the second housing 12, the first position sensor 90 is adjacent to the second rotating member 43, and the second position sensor 110 is adjacent to the first rotating member 42.

Of course, the first position sensor 90 and the second position sensor 110 may be provided on the first housing 11 and the second position sensor 110 may be provided on the second housing 12, in addition to being provided in the third housing 13.

In another embodiment, the controller 80 may further determine whether the motor 41 is locked by determining whether the second housing 12 normally reaches the minimum moving position or the maximum moving position of the second housing 12 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 difference between the sending of the first position signal and the sending of the second position signal exceeds a preset time period, the controller 80 determines that the motor 41 is locked, and sends a prompt to notify the detection personnel of timely maintenance.

Referring to fig. 7, in one embodiment, the dc current transmission device 100 further includes a battery pack 120, the battery pack 120 is disposed in the third housing 13, and the battery pack 120 is used for supplying power to the motor 41.

The battery pack 120 is electrically connected to the motor 41 to supply power to the motor 41 so that the motor 41 can operate. The dc current transmission device 100 can normally operate for a long time without providing an additional power supply, supported by the power supply of the battery pack 120. 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 120 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 120 has high energy efficiency, can be charged and discharged circularly, and can continuously provide electric energy for the dc current 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 120. The power converter is used to convert the electric energy in the battery pack 120 into a rated voltage to be supplied to the motor 41. In this way, the motor 41 can operate normally at a rated voltage.

In one embodiment, the battery pack 120 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 120 according to whether the motor 41 is operated.

When the motor 41 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 120 to supply power to the motor 41. When the operation of the motor 41 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 120. In this way, the controller 80 controls whether or not the power converter converts the electric power of the battery pack 120 according to whether or not the motor 41 is operated, and the overall power consumption can be reduced.

In one embodiment, the battery pack 120 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. 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 transmitting device 100 further includes a controller 80. When the second housing 12 is close to the first housing 11, the second housing 12 and the first housing 11 are buckled with the cable 200 to be tested of the transformer, and the controller 80 is used for controlling the first hall sensor 20 and the second hall sensor 30 to collect current parameters 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 may control the motor 41 to drive the first rotating member 42 to rotate, so that the first rotating member 42 drives the second housing 12 to move relative to the first housing 11. When the second housing 12 is close to the first housing 11, the controller 80 may further control the first hall sensor 20 and the second hall sensor 30 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 direct current testing system 1000, the first rotating member 42 in the driving assembly 40 is connected to the motor 41 and is in transmission connection with the second housing 12, when the motor 41 is driven, the first rotating member 42 rotates to drive the second housing 12 to move relative to the first housing 11, so that the direct current transmission device 100 can be installed on the cable 200 to be tested of the transformer neutral point when the second housing 12 is close to the first housing 11, and can acquire the current parameter of the transformer neutral point when the second hall sensor 30 and the first hall sensor 20 are close to each other; the cable 200 to be tested of the neutral point of the transformer can be loosened when the second housing 12 is far away from the first housing 11. Therefore, the detecting personnel only need to cut off the power of the transformer on site and install the direct current transmission device 100 on the neutral point of the transformer, follow-up disassembly of the direct current transmission device 100 on site is not needed, the direct current transmission device 100 can be disassembled or reinstalled only by controlling the motor 41 to drive the first rotating member 42 to rotate, the detecting personnel can reduce the times of high-voltage and strong electromagnetic environments close to the transformer, and the personal safety of the detecting personnel is guaranteed. 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 41, 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 41 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 communication cable 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 storage device 500 is connected to the dc current transmission device 100 and the display device 300 through the communication device 400, and the storage device 500 is used for storing the current parameters processed by the controller 80.

Specifically, when the installation site is unattended, the storage device 500 of the external device can also be used for storing historical monitoring, so that the detection personnel can conveniently retrieve historical monitoring data.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is 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 (15)

1. The direct current transmission device is characterized by comprising a shell, a first Hall sensor, a second Hall sensor and a driving assembly;

the shell comprises a first shell, a second shell and a third shell, the first shell is opposite to the second shell, the first shell is fixedly connected with the third shell, and the second shell is movably connected with the third shell; the first Hall sensor is arranged in the first shell, the second Hall sensor is arranged in the second shell, and the driving assembly is arranged in the third shell;

the driving assembly comprises a motor and a first rotating piece, the motor is connected with the first rotating piece, and the first rotating piece is in transmission connection with the second shell; the first rotating piece is used for rotating when being driven by the motor so as to drive the second shell to move relative to the first shell, so that the second Hall sensor is close to or far away from the first Hall sensor.

2. The apparatus according to claim 1, wherein the first rotating member includes a first transmission portion, and the second housing includes a second transmission portion for transmission connection with the first transmission portion.

3. The apparatus according to claim 2, wherein the first rotating member is a gear, and the first transmission portion and the second transmission portion are both gear teeth; or

The first rotating piece is a friction wheel, the first transmission part is the outer side wall of the friction wheel, and the second transmission part is the outer side wall of the second shell.

4. The apparatus according to claim 1, wherein the driving assembly further comprises a second rotating member and a transmitting member, the first rotating member being disposed in the third housing at a position away from the first hall sensor, the second rotating member being disposed in the third housing at a position close to the first hall sensor; the transmission part is sleeved on the first rotating part and the second rotating part and is connected with the second shell;

the first rotating part is used for rotating when being driven by the motor so as to drive the conveying part to move between the first rotating part and the second rotating part, and the conveying part drives the second shell to move relative to the first shell.

5. The apparatus according to claim 4, wherein the first rotating member and the second rotating member are both fixed pulleys, and the transmission member includes a transmission rope or a belt; or

The first rotating piece and the second rotating piece are chain wheels, and the conveying piece is a chain.

6. The direct current transducer according to claim 4, wherein the transmitter comprises a first sub transmitter, the first sub transmitter is sleeved on the first rotating member and the second rotating member, one end of the first sub transmitter is connected to the second housing, and the first sub transmitter is configured to move when the second rotating member rotates, so as to drive the second housing to move relative to the first housing;

the direct current transmission device further comprises a first torsion spring, the first torsion spring is arranged on the second shell, and one support arm of the first torsion spring is connected with the other end of the first sub-transmission member;

the second shell is close to the first shell, the first fixing part is combined with the first combining part.

7. The apparatus according to claim 6, wherein the first fixing portion is a projection, and the first coupling portion is a groove; or

The first fixing part is a groove, and the first combining part is a protrusion.

8. The apparatus according to claim 6, wherein the driving assembly further comprises a third rotating member, the apparatus further comprising a second torsion spring, the third rotating member being disposed on the second housing at a position close to the first torsion spring, the second torsion spring being disposed on the second housing at a position far from the first torsion spring;

the conveying piece further comprises a second sub conveying piece, the second sub conveying piece is sequentially sleeved on the first rotating piece, the second rotating piece and the third rotating piece, one end of the second sub conveying piece is connected with the second shell, the other end of the second sub conveying piece is connected with one supporting arm of the second torsion spring, and the second sub conveying piece is used for moving when the second rotating piece rotates;

and a second fixing part is arranged on the other support arm of the second torsion spring, a second combining part is arranged on the first shell, and the second fixing part is combined with the second combining part when the second shell is close to the first shell.

9. The apparatus of claim 8, wherein the transmitter further comprises a third sub-transmitter, the third sub-transmitter is disposed on the first and second rotating members; the sub-conveying member of third includes stiff end and free end, the stiff end with second casing fixed connection when the free end is by manual movement, the sub-conveying member of third removes, so that the second casing is relative first casing removes.

10. The dc current transducer according to any one of claims 1 to 9, further comprising a limiting member, wherein the limiting member comprises a first end and a second end opposite to each other, the first end is fixedly connected to the first housing, the second end is movably disposed on the second housing, and when the second housing is close to the first housing, the second end abuts against an outer side of the second housing; when the second shell is far away from the first shell, the second end pulls the inner side edge of the second shell.

11. The dc current transducer arrangement according to any of claims 1 to 9, further comprising a battery pack disposed within the third housing, the battery pack being configured to power the motor.

12. The apparatus according to any one of claims 1 to 9, further comprising a controller electrically connected to the motor, wherein the controller is configured to send a control signal, and the control signal is configured to control the motor to drive the first rotating member to rotate.

13. The dc current transducer arrangement of claim 12, further comprising a first position sensor disposed on the third housing proximate to the first hall sensor and a second position sensor disposed on the third housing distal from the first hall sensor, the first and second position sensors each being electrically connected to the controller;

the first position sensor is used for sending a first position signal to the controller when the second Hall sensor is close to the first position sensor, the second position sensor is used for sending a second position signal to the controller when the second Hall sensor is close to the second position sensor, and the controller controls the motor to stop working according to the first position signal and the second position signal.

14. 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 11 and a display device connected with the direct current transmission device;

the direct current transmission device further comprises a controller, when the second shell is close to the first shell, the second shell and the first shell are buckled on a cable to be tested of the transformer, and the controller is 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.

15. The transformer neutral point direct current test system according to claim 14, 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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