An insulation resistance measuring device

Abstract

The utility model discloses an insulation resistance measuring device, include: the connector, insulating rod, measurement module, display module and high pressure test line, the connector is U type structure, the connector is connected with insulating rod, and display module is connected with measurement module, and the connector is connected with measurement module through high pressure test line, measurement module sends test signal, and sends test signal to the contact net through high pressure test line and the connector of hanging in the contact net, and the contact net sends sampling signal to the test module through the connector and high pressure test line, and the test module generates the measurement result sent to display module according to sampling signal. Through U type connector and insulating rod, make the operating personnel to be able to hang the measuring device to the contact net outside the safe distance, need not to carry out complicated isolation and the ground wire operation of hanging to the superior or the subordinate switch, can quickly, conveniently complete insulation resistance test when the contact net is no electricity, reduced the risk of electric shock of personnel, also can fast measurement in the scene such as emergency repair.

Description

Technical Field

[0001] This utility model relates to the field of insulation resistance measurement technology, and in particular to an insulation resistance measuring device. Background Technology

[0002] Currently, insulation resistance testing mostly uses electronic or mechanical megohmmeters. High voltage is generated by hand-cranking or electronically, and then the leakage current is measured. The insulation resistance value is calculated using Ohm's law. This method is accurate, technically mature, and widely used for insulation resistance testing of power systems in various power outage locations.

[0003] However, this measurement method requires personnel to touch the electrical equipment with instruments, which does not ensure operational safety. The product can only be used in situations where the power has been cut off and there is reliable grounding or isolation in the direction of incoming power. In some emergency repair situations, it has limitations and is not conducive to the efficiency of emergency repair. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide an insulation resistance measuring device that can test the insulation resistance of the contact network when there is no power, without the need for multiple isolations of the upper and lower level switches or grounding wires, thus ensuring the personal safety of the insulation resistance testing personnel to the greatest extent.

[0005] To solve the above problems, this utility model is implemented according to the following solution:

[0006] An insulation resistance measuring device is provided, comprising: a connector, an insulating rod, a measuring module, a display module, and a high-voltage test lead; the connector is U-shaped; the connector is connected to the insulating rod, the display module is connected to the measuring module, and the connector and the measuring module are connected via the high-voltage test lead;

[0007] The measurement module sends a test signal to the contact network through the high-voltage test line and the connector attached to the contact network. The contact network sends a sampling signal to the test module through the connector and the high-voltage test line. The test module generates a measurement result based on the sampling signal and sends it to the display module.

[0008] Compared with existing technologies, the beneficial effects of this utility model's insulation resistance measuring device are as follows: Through the U-shaped connector and insulating rod, operators can attach the measuring device to the contact network from a safe distance and remotely transmit test and sampling signals using high-voltage test lines; the measuring module and display module work together to complete the measurement and display of insulation resistance, significantly improving operational safety. It eliminates the need for complex isolation and grounding operations on upstream or downstream switches, allowing for quick and convenient insulation resistance testing even when the contact network is confirmed to be de-energized, reducing the risk of electric shock. It can also be used for rapid measurement in emergency repair scenarios.

[0009] Optionally, it also includes a voltage detector, which is located at one end of the connector near the insulating rod.

[0010] Optionally, the insulating rod is a telescopic structure.

[0011] Optionally, the measurement module includes an isolation unit, a boost unit, and a control unit; the isolation unit is connected to the connector via the high-voltage test line, the boost unit is connected to the isolation unit and the control unit, and the control unit is connected to the display module.

[0012] Optionally, the isolation unit includes a first diode and a second diode, the anode of the first diode is connected to the cathode of the second diode, the cathode of the first diode is connected to the high-voltage test line, and the anode of the second diode is connected to the boost unit.

[0013] Optionally, the boost unit includes a closing button, a power supply, a DC boost subunit, and a voltage divider resistor; the closing button is connected to the power supply and the DC boost subunit, the DC boost subunit is connected to the anode of the second diode through the voltage divider resistor, and the voltage divider resistor is connected to the control unit.

[0014] Optionally, the boost unit also includes an indicator light, which is connected to the closing button and the power supply. Attached Figure Description

[0015] Figure 1 This is an overall structural diagram of the measuring device of this utility model;

[0016] Figure 2 This is a partial circuit diagram of the measuring device of this utility model;

[0017] The attached diagram shows the following labels: 1. Connector; 2. Insulating rod; 3. Measuring module; 301. Isolation unit; 3011. First diode; 3012. Second diode; 302. Boost unit; 3021. Closing button; 3022. Power supply; 3023. DC boost subunit; 3024. Voltage divider resistor; 3025. Indicator light; 303. Control unit; 4. Display module; 5. High-voltage test lead; 6. Voltage detector. Detailed Implementation

[0018] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0019] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0020] See Figure 1-2 As shown, the present invention provides an insulation resistance measuring device, comprising: a connector 1, an insulating rod 2, a measuring module 3, a display module 4, a high-voltage test line 5, and a voltage detector 6; the connector 1 has a U-shaped structure; the connector 1 is connected to the insulating rod 2, the display module 4 is communicatively connected to the measuring module 3, the connector 1 and the measuring module 3 are connected via the high-voltage test line 5, and the voltage detector 6 is located at one end of the connector 1 near the insulating rod 2, and the insulating rod 2 has a telescopic structure.

[0021] The operator adjusts the height of the hanging joint 1 by adjusting the insulating rod 2 of the telescopic structure, so that when the operator grasps the insulating rod 2, the U-shaped hanging joint 1 can be hung on the contact wire. At the same time, the voltage detector 6 on the hanging joint 1 continuously checks whether the hanging contact wire is energized. When the contact wire is energized, the voltage detector 6 will sound an alarm to remind the operator, so as to ensure that the operator can measure the insulation resistance when the contact wire is not energized.

[0022] When the connector 1 is attached to the unenergized contact network, the measurement module 3 sends a test signal and transmits the test signal to the contact network through the high-voltage test line 5 and the connector 1 attached to the contact network. The contact network sends a sampling signal to the test module through the connector 1 and the high-voltage test line 5. The test module generates the measurement result based on the sampling signal and sends it to the display module 4.

[0023] In one embodiment of this utility model, the measurement module 3 includes an isolation unit 301, a boost unit 302, and a control unit 303. The control unit 303 is specifically a PLC module. The isolation unit 301 is connected to the connector 1 through a high-voltage test line 5. The boost unit 302 is connected to the isolation unit 301 and the control unit 303. The control unit 303 is communicatively connected to the display module 4.

[0024] The isolation unit 301 includes a first diode 3011 and a second diode 3012 connected in series. Both the first diode 3011 and the second diode 3012 are single-phase DC 400V conducting diodes. The conduction direction of the first diode 3011 and the second diode 3012 is from the boost unit 302 to the high-voltage test line 5 (measurement module 3 - high-voltage test line 5 - connector 1 - contact wire), so as to reverse cut off and isolate the high voltage from the contact wire to the measurement module 3. The connection relationship of the first diode 3011 and the second diode 3012 is as follows: the anode of the first diode 3011 is connected to the cathode of the second diode 3012, the cathode of the first diode 3011 is connected to the high-voltage test line 5, and the anode of the second diode 3012 is connected to the boost unit 302. This device blocks the DC 1500V high voltage of the contact wire through the isolation unit 301, ensuring the personal safety of the operator when measuring the insulation resistance of the contact wire.

[0025] In one embodiment of this utility model, the boost unit 302 includes a closing button 3021, a power supply 3022, a DC boost subunit 3023, and a voltage divider resistor 3024. The power supply 3022 is a 24V battery, and the voltage divider resistor 3024 has a resistance of 1MΩ. The closing button 3021 is connected to the power supply 3022 and the DC boost subunit 3023. The positive output terminal of the DC boost subunit 3023 is connected to the anode of the second diode 3012 through the voltage divider resistor 3024, and the negative output terminal of the DC boost subunit 3023 is connected to the contact rail. The voltage divider resistor 3024 is connected to the control unit 303. The boost unit 302 also includes an indicator light 3025, which is connected to the closing button 3021 and the power supply 3022. When the closing button 3021 is pressed, a test signal is output, and the indicator light 3025 reminds the operator that a measurement is in progress.

[0026] In the DC boost subunit 3023, after the operator presses the closing button 3021, the indicator light 3025 illuminates, and the power supply 3022 (DC24V) boosts the voltage to the test voltage U0 (DC1000V), and outputs it to the voltage divider resistor 3024 through its positive output terminal. The test voltage U0 is used as the input voltage of the voltage divider resistor 3024. The test voltage U0 (test signal) passes through the voltage divider resistor 3024, the isolation unit 301, and the high-voltage test line 5 to the contact network. The output voltage U1 (sampling signal) of the voltage divider resistor 3024 is collected and sent to the control unit 303. Based on the voltages U0 and U1 and the voltage divider resistor 3024, the control unit 303 can calculate the insulation resistance R = U1 * R0 / (U0 - U1) according to Ohm's law, where R0 is the resistance value of the voltage divider resistor 3024 and R is the insulation resistance value, which is the test result.

[0027] This invention, through the U-shaped connector 1 and the insulating rod 2, allows operators to attach the measuring device to the contact network from a safe distance, and remotely transmits the test signal (U0) and sampling signal (U1) using the high-voltage test line 5. The measuring module 3 and the display module 4 work together to complete the measurement and display of insulation resistance, significantly improving operational safety. It eliminates the need for complex isolation and grounding operations on upstream or downstream switches, and can quickly and conveniently complete insulation resistance testing when the contact network is confirmed to be de-energized, reducing the risk of electric shock. It can also be used for rapid measurement in emergency repair scenarios. At the same time, the voltage detector 6 can quickly check whether the contact network is energized, ensuring the personal safety of operators during measurement.

[0028] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An insulation resistance measuring device, characterized in that, include: The device includes a connector, an insulating rod, a measuring module, a display module, and a high-voltage test cable; the connector has a U-shaped structure; the connector is connected to the insulating rod, the display module is connected to the measuring module, and the connector and the measuring module are connected via the high-voltage test cable. The measurement module sends a test signal to the contact network through the high-voltage test line and the connector attached to the contact network. The contact network sends a sampling signal to the test module through the connector and the high-voltage test line. The test module generates a measurement result based on the sampling signal and sends it to the display module.

2. The insulation resistance measuring device according to claim 1, characterized in that, It also includes a voltage detector, which is located at one end of the connector near the insulating rod.

3. The insulation resistance measuring device according to claim 1, characterized in that, The insulating rod is a telescopic structure.

4. The insulation resistance measuring device according to claim 1, characterized in that, The measurement module includes an isolation unit, a boost unit, and a control unit; the isolation unit is connected to the connector via the high-voltage test line, the boost unit is connected to the isolation unit and the control unit, and the control unit is connected to the display module.

5. An insulation resistance measuring device according to claim 4, characterized in that, The isolation unit includes a first diode and a second diode. The anode of the first diode is connected to the cathode of the second diode. The cathode of the first diode is connected to the high-voltage test line, and the anode of the second diode is connected to the boost unit.

6. An insulation resistance measuring device according to claim 5, characterized in that, The boost unit includes a closing button, a power supply, a DC boost subunit, and a voltage divider resistor; the closing button is connected to the power supply and the DC boost subunit, the DC boost subunit is connected to the anode of the second diode through the voltage divider resistor, and the voltage divider resistor is connected to the control unit.

7. An insulation resistance measuring device according to claim 6, characterized in that, The boost unit also includes an indicator light, which is connected to the closing button and the power supply.

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