Automatic testing device for minimum acquisition current sensor of power distribution network

Abstract

The utility model relates to an automatic testing device for a minimum acquisition current sensor of a power distribution network, which is characterized in that a sliding frame is fixedly arranged on a fixed seat of a fixed support, a transverse sliding rod of the sliding frame can longitudinally slide on a longitudinal sliding rod, and a cable clamp is arranged on the transverse sliding rod; the gap adjusting device located above the cable clamp is arranged on a supporting rod of the fixing support and comprises an electric push rod capable of moving up and down, and the electric push rod is matched with the cable clamp. The rotating module comprises a base, a central rotating shaft and a turntable, the base is fixedly and slidably arranged on the fixed seat, the lower end of the central rotating shaft is rotatably arranged on the base, the upper end is fixedly connected with the turntable, and the TMR current switch sensor is arranged on the top surface of the turntable. According to the utility model, through automatic sensor position, angle and gap adjustment, the performance of the sensor under different working conditions can be evaluated efficiently and accurately, optimal installation parameters can be generated, and the device is suitable for a minimum acquisition scheme of the current sensor in a power distribution network.

Description

TECHNICAL FIELD

[0001] The utility model relates to a distribution network minimization collection current sensor automatic testing device especially relates to a current sensor test device based on TMR (tunnel magnetoresistance effect) technique. BACKGROUND

[0002] With the intelligent development of power system, current sensors have been widely used in distribution networks. TMR (tunnel magnetoresistance effect) current sensors have a series of advantages such as high sensitivity, low power consumption, wide frequency band, high stability, and high temperature resistance, and have become one of the preferred sensor types in modern distribution network current detection. TMR current sensors are particularly suitable for use in the minimization collection scheme of new distribution networks, as they can efficiently monitor current changes and achieve installation and operation in limited space power equipment.

[0003] However, the application performance of TMR current sensors is affected by various factors, such as the cross-sectional area of the cable, the insulation thickness, the fixed gap compression degree, the installation angle, etc. These factors all have an important impact on the measurement accuracy and reliability of the sensor. Specifically as follows:

[0004] Cable cross-sectional area: affects the flow capacity of the current and the inductance of the sensor.

[0005] Insulation thickness: changes in insulation thickness will affect the electromagnetic induction effect between the sensor and the cable.

[0006] Fixed gap compression degree: the gap between the sensor and the cable affects the coupling of the magnetic field, which in turn affects the measurement results.

[0007] Installation angle: the measurement sensitivity of the TMR sensor changes with the installation angle, which may cause measurement errors.

[0008] In order to better study the influence of the above variables on the performance of TMR current sensors, it is particularly important to design an automatic testing device that can automatically adjust the position, gap, angle, etc. of the sensor and the cable. SUMMARY

[0009] The utility model discloses a distribution network minimization collection current sensor automatic testing device can assist practice swing rhythm.

[0010] The utility model discloses a distribution network minimization collection current sensor automatic testing device, which can automatically adjust the position, gap, angle, etc. of the sensor and the cable.

[0011] A distribution network minimization collection current sensor automatic testing device, characterized by: comprising a fixed support, a sliding frame, a cable clamp, a TMR current switch sensor, an adjustment gap device and a rotation module.

[0012] The sliding frame is fixedly arranged on the fixing seat of the fixing support, and comprises a transverse sliding rod and a longitudinal sliding rod, the transverse sliding rod is capable of longitudinally sliding on the longitudinal sliding rod, and the cable clamp is arranged on the transverse sliding rod of the sliding frame.

[0013] The adjusting gap device is arranged on the supporting rod of the fixing support, is located above the cable clamp, and comprises an electric push rod capable of moving up and down, and the electric push rod is matched with the cable clamp.

[0014] The rotating module comprises a base, a central rotating shaft and a rotating disc, the base is fixedly arranged on the fixing seat, the lower end of the central rotating shaft is rotationally arranged on the base, the upper end of the central rotating shaft is fixedly connected with the rotating disc, and the TMR current switch sensor is arranged on the top surface of the rotating disc.

[0015] Further, the cable clamp has four.

[0016] Further, the sliding frame is provided with a limit switch.

[0017] Further, the control panel comprises a start-stop switch, a recording switch, a reset switch and a selection switch.

[0018] Further, the data signal collector comprises a signal collection system and a data analysis system.

[0019] Compared with the prior art, the power distribution network minimum acquisition current sensor automatic testing device has the beneficial effects that:

[0020] The power distribution network minimum acquisition current sensor automatic testing device can simulate various conditions in actual application scenes, help obtain optimal installation parameters of the sensor, and improve the testing efficiency and precision of the current sensor. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a schematic view of the power distribution network minimum acquisition current sensor automatic testing device of the utility model.

[0022] Figure 2 FIG. 2 is an electrical schematic diagram of the power distribution network minimum acquisition current sensor automatic testing device of the utility model.

[0023] In the drawings:

[0024] Fixing support 1, fixing seat 1.1, supporting rod 1.2, sliding frame 2, transverse sliding rod 2.1, longitudinal sliding rod 2.2, cable clamp 3, TMR current switch sensor 4, adjusting gap device 5, electric push rod 5.1, data signal collector 6, control panel 7, rotating module 9, base 9.1, central rotating shaft 9.2, rotating disc 9.3, start-stop switch 10, recording switch 11, reset switch 12, selection switch 13. DETAILED DESCRIPTION

[0025] The specific embodiments of the utility model are further described below in combination with the drawings and examples. The following examples are only used to more clearly illustrate the technical scheme of the utility model, and cannot limit the protection scope of the utility model.

[0026] Referring to Figure 1 The utility model discloses a distribution network minimization acquisition current sensor automatic testing device, including fixed support 1, sliding frame 2, cable clamp 3, TMR current switch sensor 4, adjusting gap device 5, data signal collector 6, control panel 7 and rotary module 9.

[0027] Data signal collector 6 is built-in in the organism of control panel 7, is controlled by the controller of organism, shows sensor measurement data and waveform.

[0028] The fixed setting of sliding frame 2 is on the fixed seat 1.1 of fixed support 1, and sliding frame 2 includes transverse slide bar 2.1 and longitudinal slide bar 2.2, transverse slide bar 2.1 can longitudinally slide on longitudinal slide bar 2.2, and sliding frame 2 is built-in limit switch, and four cable clamps 3 are evenly arranged on the transverse slide bar 2.1 of sliding frame 2.

[0029] Among them, cable clamp 3 is used to install the cable of different cross-sectional area and insulation thickness, can quickly replace the test object according to the requirement of different cable.Cable clamp 3 has adjusting function, can change the clamping force according to different test requirements.

[0030] Control panel 7 includes start-stop switch 10, recording switch 11, reset switch 12 and selection switch 13, obtains the optimal installation data of the change of the cross-sectional area, insulation thickness, fixed gap compression degree, installation angle of different cable.

[0031] Adjusting gap device 5 is arranged on the support rod 1.2 of fixed support 1, and adjusting gap device 5 is located above cable clamp 3, and adjusting gap device 5 includes electric push rod 5.1 that can move up and down, under the action of electric push rod 5.1, the compression degree can be quickly changed, and the sensitivity of TMR current switch sensor 4 under different gap conditions is tested.

[0032] Rotary module 9 includes base 9.1, center rotating shaft 9.2 and rotating disc 9.3, and base fixing 9.1 is slidably arranged on fixed seat 1.1, base fixing 9.1 can slide transversely on fixed seat 1.1, the lower end of center rotating shaft 9.2 is rotatably arranged on base 9.1, the upper end of center rotating shaft 9.2 is fixedly connected with rotating disc 9.3, and TMR current switch sensor 4 is arranged on the top surface of rotating disc 9.3.

[0033] The TMR current switch sensor 4 is based on the principle of electromagnetic induction, uses a tunnel magnetoresistance (TMR) design with high sensitivity and high signal-to-noise ratio, and has a built-in temperature drift compensation circuit. In the case of electrical isolation between the primary and secondary sides, the TMR current switch sensor 4 can accurately measure direct current, alternating current, and pulse current signals.

[0034] The data signal collector 6 includes a signal collection system and a data analysis system. The signal collection system is used to collect the output current data of the current sensor in real time, and the signal waveform is displayed in the middle of the display screen of the control panel 7. The data analysis system analyzes the stored current data under different parameter conditions through software to provide the best installation suggestion according to the performance of the sensor.

[0035] Working principle:

[0036] The transverse sliding rod 2.1 can longitudinally slide on the longitudinal sliding rod 2.2, and is used to adjust the longitudinal relative position of the cable clamp 3 and the TMR current switch sensor 4.

[0037] The base fixing 9.1 can horizontally slide on the fixed seat 1.1, and is used to adjust the horizontal relative position of the TMR current switch sensor 4 and the cable clamp 3.

[0038] The lower end of the central rotating shaft 9.2 is rotatably arranged on the base 9.1, the upper end of the central rotating shaft 9.2 is fixedly connected with the rotating disc 9.3, the TMR current switch sensor 4 is arranged on the top surface of the rotating disc 9.3, and the rotation of the central rotating shaft 9.2 can drive the TMR current switch sensor 4 to rotate, so as to further test the sensitivity of the TMR current switch sensor 4.

[0039] The adjusting gap device 5 is located above the cable clamp 3, and the adjusting gap device 5 includes an electric push rod 5.1 which can move up and down. The electric push rod 5.1 cooperates with the cable to quickly adjust the fixed gap between the TMR current sensor and the cable. Specific embodiments

[0040] Electrical connection part:

[0041] The positive electrode of the control panel 7 is connected with the a end of the adjusting gap device 5, the b end of the adjusting gap device 5 is connected with the c end of the sliding frame 2, the d end of the sliding frame 2 is connected with the e end of the rotating module 9, the f end of the rotating module 9 is connected with the g end of the cable clamp 3, and the h end of the cable clamp 3 is connected with the negative electrode of the control panel 7.

[0042] Electrical principle part:

[0043] Reference Figure 2, turn on 220V power supply, switch K1 corresponding to start-stop switch 10, connected to the controller INPUT1 end; switch K2 corresponding to the record switch 11, connected to the controller INPUT2 end; switch K3 reset switch 13, connected to the controller INPUT3 end; selection switch S3 corresponding to the selection switch 13, four contacts are connected to the controller INPUT4, INPUT5, INPUT6, INPUT7 end, respectively corresponding to the position, distance, angle, diameter test type;

[0044] The display is interconnected with the controller; the TMR current switch sensor 4 sends the measured current signal to the signal processing unit, and the processed current signal is input to the INPUT8 port of the controller; one end of the driver 1 is connected to the OUTPUT1 of the controller, and the other end is connected with the horizontal stepping motor connected with the fixed base 9.1 on the fixed base 1.1, for position control and driving of the horizontal stepping motor; one end of the driver 2 is connected to the OUTPUT2 of the controller, and one end of the driver 3 is connected to the OUTPUT3 of the controller; the drivers 2 and 3 control the position control and driving of the double-side longitudinal stepping motor respectively, and the double-side longitudinal stepping motor drives the horizontal slide rod 2.1 to slide on the longitudinal slide rod 2.2; one end of the driver 4 is connected to the OUTPUT4 of the controller, and the other end is connected with the gap adjusting device 5; one end of the driver 5 is connected to the OUTPUT5 of the controller, and the other end is connected with the rotating module 9; one end of the driver 6 is connected to the OUTPUT6 of the controller, and the other end is connected with the cable clamp 3.

[0045] When the power distribution network minimum acquisition current sensor automatic test device is used to test the influence of sensor position change on measurement results, switch on the switch power supply, switch K1, turn on the selection switch S3 to the "INPUT4" gear, the controller transmits the driving signal to the driver, the driver receives the signal to drive the stepping motor to drag the cable clamp to move left and right on the X-axis platform according to the set step distance, while the Y-axis platform drives the whole structure to adjust up and down synchronously. The sensor performs test at different positions in the XY plane, and measures the current signal output at different positions. Turn off the switch K1, the controller displays the final current output waveform on the left side of the display, and the position signal is displayed on the right side of the display. Turn on the switch K2, the controller stores the sensor coordinate data. Turn on the switch K3, the controller transmits the driving signal to the driver, and the driver receives the signal to drive the stepping motor to drag the cable clamp back to the initial position.

[0046] In the use of the power distribution network minimization collection current sensor automatic test device tests the influence of the fixed gap change between the sensor and the cable on the measurement result, the switch power supply, the switch K1 is turned on, the selection switch S3 is turned on to the "INPUT5" file, the controller transmits the driving signal to the driver 4, the driver 4 receives the signal and drives the movable electric push rod of the adjusting gap device to move, so that the fixed gap between the cable and the sensor is changed. The sensor performs a test at different gap lengths, and measures the current signal output at different distances. Turn off the switch K1, the controller displays the final current output waveform on the left side of the display, and the distance signal is displayed on the right side of the display. Turn on the switch K2, the controller stores the sensor gap data. Turn on the switch K3, the controller transmits the driving signal to the driver 4, and the driver 4 receives the signal and drives the movable electric push rod to return to the initial position.

[0047] In the use of the power distribution network minimization collection current sensor automatic test device tests the influence of the fixed gap change between the sensor and the cable on the measurement result, the switch power supply, the switch K1 is turned on, the selection switch S3 is turned on to the "INPUT5" file, the controller transmits the driving signal to the driver 4, the driver 4 receives the signal and drives the movable electric push rod of the adjusting gap device to move, so that the fixed gap between the cable and the sensor is changed. The sensor performs a test at different gap lengths, and measures the current signal output at different distances. Turn off the switch K1, the controller displays the final current output waveform on the left side of the display, and the distance signal is displayed on the right side of the display. Turn on the switch K2, the controller stores the sensor gap data. Turn on the switch K3, the controller transmits the driving signal to the driver 4, and the driver 4 receives the signal and drives the movable electric push rod to return to the initial position.

[0048] In the use of the power distribution network minimization collection current sensor automatic test device tests the influence of the fixed gap change between the sensor and the cable on the measurement result, the switch power supply, the switch K1 is turned on, the selection switch S3 is turned on to the "INPUT5" file, the controller transmits the driving signal to the driver 4, the driver 4 receives the signal and drives the movable electric push rod of the adjusting gap device to move, so that the fixed gap between the cable and the sensor is changed. The sensor performs a test at different gap lengths, and measures the current signal output at different distances. Turn off the switch K1, the controller displays the final current output waveform on the left side of the display, and the distance signal is displayed on the right side of the display. Turn on the switch K2, the controller stores the sensor gap data. Turn on the switch K3, the controller transmits the driving signal to the driver 4, and the driver 4 receives the signal and drives the movable electric push rod to return to the initial position.

[0049] The utility model can quickly and efficiently test the performance of TMR current sensor under different installation conditions. The device can automatically adjust the sensor position, angle and gap, realize omnidirectional testing, greatly improve the testing efficiency and precision. The data analysis system can quickly generate a test report, providing a reliable basis for the optimized installation of the sensor.

[0050] In the above embodiments, only the utility model is described demonstratively, but the person skilled in the art can make various modifications to the utility model without departing from the spirit and scope of the utility model after reading the patent application.

Claims

1. A power distribution grid minimization current sensor auto-test device, characterized by: The fixed support, the sliding frame, the cable clamp, the TMR current switch sensor, the gap adjusting device and the rotating module are included. The sliding frame is fixedly arranged on the fixed seat of the fixed support, and includes a transverse sliding rod and a longitudinal sliding rod. The gap adjusting device is arranged on the supporting rod of the fixed support and is located above the cable clamp. The rotating module includes a base, a central rotating shaft and a rotating disc.

2. The power distribution network minimization current sensor automatic test device of claim 1, wherein: The cable clamp has four.

3. The power distribution network minimization current sensor automatic test device of claim 1, wherein: The sliding frame is provided with a built-in limit switch.

4. The power distribution network minimization current sensor automatic test device of claim 1, wherein: The control panel includes a start-stop switch, a recording switch, a reset switch and a selection switch.

5. The power distribution network minimization current sensor automatic test device of claim 1, wherein: The data signal collector includes a signal collection system and a data analysis system.

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