CN113092971A - Online cable insulation detection system and method - Google Patents
Online cable insulation detection system and method Download PDFInfo
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- CN113092971A CN113092971A CN202110499742.3A CN202110499742A CN113092971A CN 113092971 A CN113092971 A CN 113092971A CN 202110499742 A CN202110499742 A CN 202110499742A CN 113092971 A CN113092971 A CN 113092971A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
An online cable insulation detection system and method, the system includes the earthing knife-switch used for connecting the high-tension cable and connects the earthing contactor that the earthing knife-switch and earths, also include insulating detection device, relay protector and electric power monitoring system platform; the insulation detection device 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 invention relates to the technical field of power equipment, in particular to a safe, reliable, convenient and highly intelligent online cable insulation detection system and method applicable to underground coal mines.
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.
The invention is provided for overcoming the defects in the prior art.
Disclosure of Invention
The invention aims to provide an online cable insulation detection system and method which are safe, reliable, convenient to use, highly intelligent and accord with the underground coal mine safety standard aiming at the structural defects in the prior art.
In order to achieve the above purpose, an online cable insulation detection system provided in an embodiment of the present invention is implemented by the following technical solutions:
an online cable insulation detection system, its characterized in that: the system 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 device, a relay protector and a power monitoring system platform; wherein:
the insulation detection device 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 device; 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 relay protector is in communication connection with the communication module in a wired or wireless mode, so that the insulation detection device is controlled to complete the insulation resistance detection processes of cable discharge, pressurization, boosting, detection, discharge and resetting;
the power monitoring system platform is built on a cloud server and connected with the relay protector through a communication network, and is used for receiving and storing cable insulation detection result information.
The insulation detection device also 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.
The grounding disconnecting link, the grounding contactor and the insulation detection device are arranged in the rear cavity of the explosion-proof switch; the relay protector is arranged in the front cavity of the explosion-proof switch.
The communication module and the relay protector are respectively provided with an RS485 interface and a 433M wireless communication interface, and the RS485 interfaces of the communication module and the relay protector are connected through a cavity-penetrating terminal through a communication line; 433M wireless signals sent by 433M wireless communication interfaces of the front cavity and the rear cavity can penetrate through metal intervals between the front cavity and the rear cavity to establish communication connection.
The relay protector is also provided with a 5G module and an Ethernet communication module which are used for being in communication connection with the power monitoring system platform.
The relay protector is provided with operation keys and/or a remote controller.
The system further comprises a mining UPS power supply installed in the rear cavity of the explosion-proof switch, and the mining UPS power supply is connected with the power supply module.
In addition, an embodiment of the present invention further provides an online cable insulation detection method, which relates to the above online cable insulation detection system, and the method includes the following steps:
s0: standby
When the power supply system normally operates, the grounding disconnecting link is in a breaking state, the grounding contactor is in a closing state, and the movable contact and the first fixed contact of the high-voltage output relay are in a breaking state;
s1: discharge of electricity
After the high-voltage cable is powered off, the relay protector is controlled to send a starting command to the insulation detection device, after the measurement control module receives the test command, the grounding disconnecting link is controlled to be closed, the grounding contactor 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; simultaneously, the measurement control module detects a voltage on the cable;
s2: testing
When the voltage is zero, the measurement control module controls the grounding contactor to be disconnected and then controls the movable contact and the first fixed contact of the high-voltage output relay to be closed; at the moment, the measurement control module controls the high-voltage module 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 a relay protector, and the relay protector is uploaded to a power monitoring system platform;
s3: discharge of electricity
After the test is finished, the measurement control module controls a movable contact and a first fixed contact of the high-voltage output relay to be closed, the voltage of the high-voltage module is gradually reduced to zero, and then the grounding contactor is controlled to be closed to discharge; simultaneously, the measurement control module detects a voltage on the cable;
s4: return to original
When the voltage is zero, the measurement control module controls the grounding disconnecting link to be disconnected and to be recovered to a standby state.
There is also a self-checking step between steps S1 and S2, including the steps of:
A. device preparation
The relay protector is controlled to send a test command to the insulation detection device, then the measurement control module controls the grounding disconnecting link and the grounding contactor to be in an open position and controls the movable contact and the first fixed contact of the high-voltage output relay to be closed, and at the moment, the high-voltage output end of the high-voltage module is in a no-load position;
B. no load test
Delaying for 1 second, and controlling the high-voltage module to output 2500V voltage by the measurement control module; 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 has a fault, the measurement control module sends a fault signal to the relay protector through the communication module, 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 device is normal, the measurement control module controls a movable contact and a second fixed contact of the high-voltage output relay to be closed, and the high-voltage output end of the high-voltage module is connected with a check resistor Rs; then, the measurement control module controls the high-voltage module 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 sends a fault signal to the relay protector through the communication module, and the test is stopped.
Compared with the prior art, the invention has the beneficial effects that:
through the installation and the arrangement of the online cable insulation resistance test system, 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 or 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 resistance testing system has multiple communication modes, can upload a detection result to the power monitoring system, and facilitates data management.
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 an overall connection schematic diagram of an online cable insulation detection system according to an embodiment of the present invention;
FIG. 2 is a step diagram of testing control of the online cable insulation detection method according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures to facilitate understanding by those skilled in the art:
referring to fig. 1, an embodiment of the present invention first provides an online cable insulation detection system, which is implemented by the following technical solutions:
the online cable insulation detection system comprises a grounding disconnecting link 1, a grounding contactor 2, an insulation detection device, a relay protector 7 and a power monitoring system platform 8; wherein:
the grounding knife switch 1, the grounding contactor 2 and the insulation detection device are arranged in the rear cavity 5 of the explosion-proof switch. The insulation detection device 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 device, in a specific embodiment, the online cable insulation detection system 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 device, and the high-voltage module 12 of the cable insulation detection device 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 device also 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. And the resistance value of the checking resistor Rs is tested, and the resistance value is compared with the nominal value of the checking resistor Rs to finish the checking of the cable insulation detection device.
And the 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 resistance detection device is controlled to complete the insulation resistance detection processes 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.
In addition, an embodiment of the present invention further provides an online cable insulation detection method, which relates to the above online cable insulation detection system, and the method includes the following steps:
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 device, 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 relay protector 7 is controlled to send a test command to the insulation detection device, 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 device is normal, the measurement control module controls a movable contact and a second fixed contact of the high-voltage output relay to be closed, and the high-voltage output end of the high-voltage module is connected with a check resistor Rs; then, the measurement control module controls the high-voltage module 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 sends a fault signal to the relay protector through the communication module, and the test is stopped.
Compared with the prior art, the invention has the beneficial effects that:
through the installation and the arrangement of the online cable insulation resistance test system, 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 or 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 resistance testing system has multiple communication modes, can upload a detection result to the power monitoring system, and facilitates data management.
Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that the above embodiments are only one of the preferred embodiments of the present invention, and not all embodiments can be enumerated herein for the sake of brevity, and any embodiment that can embody the claims of the present invention is within the protection scope of the present invention.
Claims (10)
1. An online cable insulation detection system, its characterized in that: the system 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 device, a relay protector and a power monitoring system platform; wherein:
the insulation detection device 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 device; 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 relay protector is in communication connection with the communication module in a wired or wireless mode, so that the insulation detection device is controlled to complete the insulation resistance detection processes of cable discharge, pressurization, boosting, detection, discharge and resetting;
the power monitoring system platform is built on a cloud server and connected with the relay protector through a communication network, and is used for receiving and storing cable insulation detection result information.
2. An online cable insulation detection system according to claim 1, characterized in that: the insulation detection device 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 system 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 system according to claim 3, characterized in that: the grounding disconnecting link, the grounding contactor and the insulation detection device are arranged in the rear cavity of the explosion-proof switch; the relay protector is arranged in the front cavity of the explosion-proof switch.
5. An online cable insulation detection system according to claim 4, characterized in that: the communication module and the relay protector are respectively provided with an RS485 interface and a 433M wireless communication interface, and the RS485 interfaces of the communication module and the relay protector are connected through a cavity-penetrating terminal through a communication line; 433M wireless signals sent by 433M wireless communication interfaces of the front cavity and the rear cavity can penetrate through metal intervals between the front cavity and the rear cavity to establish communication connection.
6. An online cable insulation detection system according to claim 5, characterized in that: the relay protector is further provided with a 5G module and an Ethernet communication module, and the 5G module and the Ethernet communication module are used for being in communication connection with the power monitoring system platform.
7. An online cable insulation detection system according to claim 6, characterized in that: the relay protector is provided with an operation key and a remote controller.
8. An online cable insulation detection system according to claim 7, characterized in that: the system further comprises a mining UPS power supply installed in the rear cavity of the explosion-proof switch, and the mining UPS power supply is connected with the power supply module.
9. An online cable insulation detection method, characterized in that the method relates to an online cable insulation detection system according to any one of claims 1 to 8, the method comprising the steps of:
s0: standby
When the power supply system normally operates, the grounding disconnecting link is in a breaking state, the grounding contactor is in a closing state, and the movable contact and the first fixed contact of the high-voltage output relay are in a breaking state;
s1: discharge of electricity
After the high-voltage cable is powered off, the relay protector is controlled to send a starting command to the insulation detection device, after the measurement control module receives the test command, the grounding disconnecting link is controlled to be closed, the grounding contactor 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; simultaneously, the measurement control module detects a voltage on the cable;
s2: testing
When the voltage is zero, the measurement control module controls the grounding contactor to be disconnected and then controls the movable contact and the first fixed contact of the high-voltage output relay to be closed; at the moment, the measurement control module controls the high-voltage module 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 a relay protector, and the relay protector is uploaded to a power monitoring system platform;
s3: discharge of electricity
After the test is finished, the measurement control module controls a movable contact and a first fixed contact of the high-voltage output relay to be closed, the voltage of the high-voltage module is gradually reduced to zero, and then the grounding contactor is controlled to be closed to discharge; simultaneously, the measurement control module detects a voltage on the cable;
s4: return to original
When the voltage is zero, the measurement control module controls the grounding disconnecting link to be disconnected and to be recovered to a standby state.
10. The online cable insulation detection method according to claim 9, wherein: there is also a self-checking step between the steps S1 and S2, including the steps of:
A. device preparation
The relay protector is controlled to send a test command to the insulation detection device, then the measurement control module controls the grounding disconnecting link and the grounding contactor to be in an open position and controls the movable contact and the first fixed contact of the high-voltage output relay to be closed, and at the moment, the high-voltage output end of the high-voltage module is in a no-load position;
B. no load test
Delaying for 1 second, and controlling the high-voltage module to output 2500V voltage by the measurement control module; 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 has a fault, the measurement control module sends a fault signal to the relay protector through the communication module, 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 device is normal, the measurement control module controls a movable contact and a second fixed contact of the high-voltage output relay to be closed, and the high-voltage output end of the high-voltage module is connected with a check resistor Rs; then, the measurement control module controls the high-voltage module 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 sends a fault signal to the relay protector through the communication module, and the test is stopped.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110499742.3A CN113092971A (en) | 2021-05-08 | 2021-05-08 | Online cable insulation detection system and method |
| CN202210491836.0A CN114755545A (en) | 2021-05-08 | 2022-05-07 | Online cable insulation detection system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110499742.3A CN113092971A (en) | 2021-05-08 | 2021-05-08 | Online cable insulation detection system and method |
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| Publication Number | Publication Date |
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| CN113092971A true CN113092971A (en) | 2021-07-09 |
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| CN202110499742.3A Withdrawn CN113092971A (en) | 2021-05-08 | 2021-05-08 | Online cable insulation detection system and method |
| CN202210491836.0A Pending CN114755545A (en) | 2021-05-08 | 2022-05-07 | Online cable insulation detection system and method |
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| CN202210491836.0A Pending CN114755545A (en) | 2021-05-08 | 2022-05-07 | Online cable insulation detection system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114002567A (en) * | 2021-11-09 | 2022-02-01 | 广州思泰信息技术有限公司 | Rapid one-key test system and method for insulation performance |
| CN115951114A (en) * | 2023-01-17 | 2023-04-11 | 上海山源电子科技股份有限公司 | Current signal identification method in power supply monitoring system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002567A (en) * | 2021-11-09 | 2022-02-01 | 广州思泰信息技术有限公司 | Rapid one-key test system and method for insulation performance |
| CN115951114A (en) * | 2023-01-17 | 2023-04-11 | 上海山源电子科技股份有限公司 | Current signal identification method in power supply monitoring system |
| CN115951114B (en) * | 2023-01-17 | 2023-06-23 | 上海山源电子科技股份有限公司 | Current signal identification method in power supply monitoring system |
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|---|---|
| CN114755545A (en) | 2022-07-15 |
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