CN215219028U - Online cable insulation detection device - Google Patents
Online cable insulation detection device Download PDFInfo
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- CN215219028U CN215219028U CN202120970164.2U CN202120970164U CN215219028U CN 215219028 U CN215219028 U CN 215219028U CN 202120970164 U CN202120970164 U CN 202120970164U CN 215219028 U CN215219028 U CN 215219028U
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- 238000009413 insulation Methods 0.000 title claims abstract description 63
- 238000001514 detection method Methods 0.000 title claims abstract description 54
- 238000005259 measurement Methods 0.000 claims abstract description 35
- 238000004891 communication Methods 0.000 claims abstract description 28
- 238000012360 testing method Methods 0.000 claims abstract description 23
- 238000005065 mining Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000001012 protector Effects 0.000 abstract description 18
- 238000012544 monitoring process Methods 0.000 abstract description 7
- 239000003245 coal Substances 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000013523 data management Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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Abstract
An online cable insulation detection device comprises a grounding disconnecting link used for connecting a high-voltage cable, a grounding contactor connected with the grounding disconnecting link and grounded, an insulation detection assembly, a relay protector and a power monitoring system platform; the insulation detection assembly comprises a power supply module, a high-voltage module, a measurement control module, a high-voltage output relay and a communication module; the relay protector is in communication connection with the communication module; the electric power monitoring system platform is set up on the cloud server and connected with the relay protector through the communication network. The advantages are that: during the maintenance of the underground power supply line of the coal mine, a maintainer can detect the insulation resistance of the power supply cable by operating an infrared remote controller or a front door button of an explosion-proof switch, so that the working efficiency is improved; the self-checking technology is adopted, so that the accuracy of the detection result is ensured; the automatic test flow avoids the safety risk; test data are automatically uploaded to the power monitoring system, and data management is facilitated.
Description
Technical Field
The utility model relates to a power equipment technical field especially relates to an online cable insulation detection device that is suitable for in pit in colliery of safe and reliable, convenient to use, high intellectuality.
Background
The underground power supply cable for the coal mine is complex in circuit, long in circuit and severe in underground environment, so that the underground cable is high in potential safety hazard probability due to insulation. And according to the relevant regulations in the fourth hundred and ninety items of the coal mine safety code, the insulation and external inspection of the fixed cabling are carried out 1 time per season; the insulation of the cabtyre cable of the mobile electrical apparatus is checked 1 time per month. According to the underground cable insulation resistance shaking test standard, a tester needs to carry a megohmmeter, the tested cable is firstly disassembled, discharged and cleaned, then wiring test is carried out, the test process needs to pay attention to factors such as the rotating speed of the megohmmeter, the high-voltage L end needs to be disassembled firstly after the test is finished, and then the handle of the megohmmeter needs to be released at a reduced speed, so that the instrument is prevented from being damaged due to the fact that the tested equipment reversely charges the megohmmeter. Not only the maintainer needs to carry relevant instrument and equipment, but also the whole testing process is complicated and dangerous.
To the defect that prior art exists, provide the utility model discloses.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the structural shortcoming of prior art, provide a safe and reliable, convenient to use, high intellectuality, and accord with colliery safety standard's online cable insulation detection device in the pit.
In order to achieve the above object, the embodiment of the present invention provides an online cable insulation detection device, which is realized by the following technical solution:
the utility model provides an online cable insulation detection device which characterized in that: the device comprises a grounding disconnecting link used for connecting a high-voltage cable, a grounding contactor connected with the grounding disconnecting link and grounded, and an insulation detection assembly; the insulation detection assembly comprises a power supply module, a high-voltage module, a measurement control module, a high-voltage output relay and a communication module; the power supply module is used for connecting an external power supply so as to provide power for the insulation detection assembly; the measurement control module is connected with the grounding disconnecting link, the grounding contactor, the high-voltage module, the high-voltage output relay and the communication module in a control mode; the high-voltage output end of the high-voltage module is connected with a movable contact of a high-voltage output relay, and a first fixed contact of the high-voltage output relay is connected between the grounding disconnecting link and the grounding contactor; a first measurement port of the measurement control module is connected between the grounding disconnecting link and the grounding contactor so as to detect high voltage; a second measurement port of the measurement control module is connected to the grounding end of the grounding contactor so as to detect leakage current; in addition, the measurement control module further comprises a calculation unit for calculating the insulation resistance of the cable through the leakage current and the high voltage.
The insulation detection assembly further comprises a check resistor Rs, one end of the check resistor Rs is connected with the second stationary contact of the high-voltage output relay, and the other end of the check resistor Rs is grounded to form a loop.
The high-voltage module is used for generating direct-current high-voltage for 500V-3KV test, comprises a PWM circuit and an RC voltage-multiplying circuit, and is connected with a high-voltage diode with reverse withstand voltage of 3000V in series at a high-voltage output end.
And the grounding disconnecting link, the grounding contactor and the insulation detection assembly are arranged in the rear cavity of the explosion-proof switch.
The communication module is provided with an RS485 interface and a 433M wireless communication interface.
The device also comprises a mining UPS power supply arranged in the rear cavity of the explosion-proof switch, and the mining UPS power supply is connected with the power supply module.
Compared with the prior art, the beneficial effects of the utility model are that:
through the installation and the arrangement of the online cable insulation detection device, the detection of the insulation resistance of the power supply cable can be carried out only by operating an infrared remote controller of a protector or a front door button of an explosion-proof switch without carrying related equipment and any wiring by maintainers during the maintenance of a power supply line under a coal mine. The working efficiency is improved, and meanwhile, the safety risk caused by wiring boosting or cable residual voltage during full-manual testing is avoided.
Drawings
The above features and advantages of the present invention will become more apparent and readily appreciated from the following description of the exemplary embodiments thereof taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic diagram of an online cable insulation detection device according to an embodiment of the present invention;
fig. 2 is a step chart of the test control of the online cable insulation detection device of the present invention.
Detailed Description
The invention will be described in further detail below with reference to the accompanying drawings so as to facilitate understanding by those skilled in the art:
referring to fig. 1, an embodiment of the present invention provides an online cable insulation detection device, which is implemented by the following technical solutions:
the online cable insulation detection device comprises a grounding disconnecting link 1, a grounding contactor 2 and an insulation detection assembly; wherein:
the grounding knife switch 1, the grounding contactor 2 and the insulation detection assembly are arranged in the explosion-proof switch rear cavity 5. The insulation detection assembly comprises a power supply module 11, a high-voltage module 12, a measurement control module 10, a high-voltage output relay 3 and a communication module 13. The power supply module 11 is used for being connected with an external power supply so as to provide a power supply for the insulation detection assembly, in a specific embodiment, the online cable insulation detection device further comprises a mining UPS (uninterrupted power supply) 9 installed in a rear cavity of the explosion-proof switch, and the mining UPS 9 is connected with the power supply module 11.
The measurement control module 10 is connected with the grounding disconnecting link 1, the grounding contactor 2, the high-voltage module 12, the high-voltage output relay 3 and the communication module 13 in a control mode.
The high-voltage module 12 is used for generating direct-current high-voltage for 500V-3KV test, and the driving capability can reach 20 milliamperes. The high voltage module 12 comprises a PWM circuit 15 and an RC voltage doubling circuit 14, and is connected in series with a high voltage diode D1 with a reverse withstand voltage of 3000V at the high voltage output terminal. The high-voltage diode D1 is connected with the moving contact of the high-voltage output relay 3, and the first fixed contact of the high-voltage output relay 3 is connected between the grounding disconnecting link 1 and the grounding contactor 2. By adding the high-voltage diode D1 and the high-voltage output relay 3 in the high-voltage output loop, the high residual voltage of the ground capacitance of the cable core wire is prevented from flowing backwards to the high-voltage output end of the cable insulation detection assembly, and the high-voltage module 12 of the cable insulation detection assembly is prevented from being burnt.
A first measurement port of the measurement control module 10 is connected between the grounding switch 1 and the grounding contactor 2 to detect a high voltage; a second measurement port of the measurement control module 10 is connected to the ground terminal of the ground contactor 2 to detect leakage current; in addition, the measurement control module 10 further includes a calculation unit that calculates the insulation resistance of the cable by the leakage current and the high voltage.
The insulation detection assembly further comprises a check resistor Rs, one end of the check resistor Rs is connected with the second stationary contact of the high-voltage output relay 3, and the other end of the check resistor Rs is grounded to form a loop. The resistance value of the checking resistor Rs is tested, and the checking of the cable insulation detection assembly is completed by comparing the resistance value with the nominal value of the checking resistor Rs.
In addition, a relay protector 7 is arranged in the front cavity of the explosion-proof switch. The insulation resistance detection device is in communication connection with the communication module in a wired or wireless mode, so that the insulation detection assembly is controlled to complete the insulation resistance detection process of cable discharging, pressurizing, boosting, detecting, discharging and resetting. In a preferred embodiment, the communication module 13 and the relay protector 7 are both provided with an RS485 interface 17 and a 433M wireless communication interface 16, and the RS485 interfaces 17 of the communication module and the relay protector are connected through an RS485 communication line via cavity-penetrating terminals; 433M wireless signals sent by the 433M wireless communication interfaces 16 of the two explosion-proof switches can penetrate through metal intervals between the front cavity and the rear cavity of the explosion-proof switch to establish communication connection.
The relay protector is provided with the infrared remote controller 19 and also has the operation function of the explosion-proof switch button 18, and the function that the relay protector controls the detection device to detect the insulation resistance of the cable on the spot can be realized through the operation of the infrared remote controller 19 and the explosion-proof switch button 18.
The power monitoring system platform 8 is built on the cloud server, is connected with the relay protector 7 through a communication network, and is used for receiving and storing cable insulation detection result information. In a preferred embodiment, the relay protector is further provided with a 5G module and an ethernet communication module, and is used for being in communication connection with the power monitoring system platform.
The operation flow and the operation principle of the above-mentioned apparatus will be described in detail below with reference to the above-mentioned structure
S0: standby
When the power supply system normally operates, the grounding disconnecting link 1 is in a breaking state, the grounding contactor 2 is in a closing state, and the movable contact and the first fixed contact of the high-voltage output relay 3 are in a breaking state;
s1: discharge of electricity
After the high-voltage cable is powered off, the relay protector 7 is controlled to send a starting command to the insulation detection assembly, after the measurement control module 10 receives the test command, the grounding disconnecting link 1 is controlled to be closed, the grounding contactor 2 is controlled to be in a closed state, and at the moment, residual voltage on the cable distribution capacitor is discharged to the ground through the grounding disconnecting link and a grounding contactor contact; meanwhile, the measurement control module 10 detects the voltage on the cable;
s2: testing
When the voltage is zero, the measurement control module 10 controls the grounding contactor to be disconnected, and then controls the movable contact and the first fixed contact of the high-voltage output relay 3 to be closed; at the moment, the measurement control module 3 controls the high-voltage module 12 to output direct-current high voltage, the voltage is increased from 0 to a set voltage, the voltage increasing time is 3-5 seconds, the voltage and the current of a test loop are detected, after the voltage and the current are stable, the insulation resistance is calculated, then the calculation result is uploaded to the relay protector 7, and the relay protector 7 is uploaded to the power monitoring system platform 8;
s3: discharge of electricity
After the test is finished, the measurement control module 10 controls the movable contact and the first fixed contact of the high-voltage output relay 3 to be closed, the voltage of the high-voltage module is gradually reduced to zero, and then the grounding contactor 2 is controlled to be closed for discharging; meanwhile, the measurement control module 10 detects the voltage on the cable;
s4: return to original
When the voltage is zero, the measurement control module 10 controls the grounding switch 1 to be disconnected and to be restored to the standby state.
In addition, in a preferred embodiment, the online cable insulation detection method is performed before the insulation resistance is formally tested, and in order to ensure that the device is tested under a fault-free condition, and thus to ensure the correctness of the test result, a self-checking step is further provided between steps S1 and S2, and the method comprises the following steps:
A. device preparation
The control relay protector 7 sends a test command to the insulation detection assembly, then the measurement control module 10 controls the grounding disconnecting link 1 and the grounding contactor 2 to be in an open position, controls the movable contact and the first fixed contact of the high-voltage output relay 3 to be closed, and at the moment, the high-voltage output end of the high-voltage module 12 is in a no-load position;
B. no load test
Delaying for 1 second, and controlling the high-voltage module 12 to output 2500V voltage by the measurement control module 10; delaying for 1 second, and measuring voltage and current after output is stable;
if the voltage is about 2500V, the current is less than 10uA, which indicates that the high-voltage output of the device is normal; otherwise, the voltage is less than 2300V, which indicates that the voltage loop is faulty, the measurement control module 10 sends a fault signal to the relay protector 7 through the communication module 13, and the test is stopped;
closing the output voltage after the no-load test is finished;
C. precision verification
After the step B is finished, if the insulation detection assembly is normal, the measurement control module 10 controls the movable contact and the second fixed contact of the high-voltage output relay 3 to be closed, and the high-voltage output end of the high-voltage module 12 is connected to a check resistor Rs; then, the measurement control module 10 controls the high-voltage module 12 to boost the voltage to 2500V, collects the voltage and the current, calculates the insulation resistance, and if the deviation of the calculated nominal value of the resistance and the checking resistance Rs is within +/-10%, the device is normal in function;
otherwise, the measurement control module 10 sends a fault signal to the relay protector 8 through the communication module 13, and the test is stopped.
Compared with the prior art, the beneficial effects of the utility model are that:
through the installation and the arrangement of the online cable insulation detection device, the detection of the insulation resistance of the power supply cable can be carried out only by operating an infrared remote controller of a protector or a front door button of an explosion-proof switch without carrying related equipment and any wiring by maintainers during the maintenance of a power supply line under a coal mine. The working efficiency is improved, and meanwhile, the safety risk caused by wiring boosting or cable residual voltage during full-manual testing is avoided.
The online cable insulation detection device has multiple communication modes, can upload detection results to a power monitoring system, and facilitates data management.
The above embodiments are intended to illustrate the present invention and the embodiments in detail, but it can be understood by those skilled in the art that the above embodiments of the present invention are only one of the preferred embodiments of the present invention, and for space limitation, all embodiments can not be listed here one by one, and any implementation that can embody the technical solution of the present invention is within the protection scope of the present invention.
Claims (6)
1. The utility model provides an online cable insulation detection device which characterized in that: the device comprises a grounding disconnecting link used for connecting a high-voltage cable, a grounding contactor connected with the grounding disconnecting link and grounded, and an insulation detection assembly; the insulation detection assembly comprises a power supply module, a high-voltage module, a measurement control module, a high-voltage output relay and a communication module; the power supply module is used for connecting an external power supply so as to provide power for the insulation detection assembly; the measurement control module is connected with the grounding disconnecting link, the grounding contactor, the high-voltage module, the high-voltage output relay and the communication module in a control mode; the high-voltage output end of the high-voltage module is connected with a movable contact of a high-voltage output relay, and a first fixed contact of the high-voltage output relay is connected between the grounding disconnecting link and the grounding contactor; a first measurement port of the measurement control module is connected between the grounding disconnecting link and the grounding contactor so as to detect high voltage; a second measurement port of the measurement control module is connected to the grounding end of the grounding contactor so as to detect leakage current; in addition, the measurement control module further comprises a calculation unit for calculating the insulation resistance of the cable through the leakage current and the high voltage.
2. An online cable insulation detection device according to claim 1, characterized in that: the insulation detection assembly further comprises a check resistor Rs, one end of the check resistor Rs is connected with the second stationary contact of the high-voltage output relay, and the other end of the check resistor Rs is grounded to form a loop.
3. An online cable insulation detection device according to claim 2, characterized in that: the high-voltage module is used for generating direct-current high-voltage for 500V-3KV test, comprises a PWM circuit and an RC voltage-multiplying circuit, and is connected with a high-voltage diode with reverse withstand voltage of 3000V in series at a high-voltage output end.
4. An online cable insulation detection device according to claim 3, characterized in that: and the grounding disconnecting link, the grounding contactor and the insulation detection assembly are arranged in the rear cavity of the explosion-proof switch.
5. An online cable insulation detection device according to claim 4, characterized in that: the communication module is provided with an RS485 interface and a 433M wireless communication interface.
6. An online cable insulation detection device according to claim 5, characterized in that: the device also comprises a mining UPS power supply arranged in the rear cavity of the explosion-proof switch, and the mining UPS power supply is connected with the power supply module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120970164.2U CN215219028U (en) | 2021-05-08 | 2021-05-08 | Online cable insulation detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120970164.2U CN215219028U (en) | 2021-05-08 | 2021-05-08 | Online cable insulation detection device |
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| Publication Number | Publication Date |
|---|---|
| CN215219028U true CN215219028U (en) | 2021-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120970164.2U Active CN215219028U (en) | 2021-05-08 | 2021-05-08 | Online cable insulation detection device |
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| CN (1) | CN215219028U (en) |
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2021
- 2021-05-08 CN CN202120970164.2U patent/CN215219028U/en active Active
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Address after: Room 209, 2nd Floor, Building 3, No. 588 Caolong Road, Songjiang District, Shanghai, 2016 Patentee after: Shanghai Sany Electronic Technology Co.,Ltd. Country or region after: China Address before: Room 505, building 23, 518, Xinzhuan Road, Songjiang high tech park, Caohejing Development Zone, Songjiang District, Shanghai 201100 Patentee before: Shanghai Sany Electronic Technology Co.,Ltd. Country or region before: China |
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