CN112904164A - High-voltage insulation level tester - Google Patents

High-voltage insulation level tester Download PDF

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Publication number
CN112904164A
CN112904164A CN202110318848.9A CN202110318848A CN112904164A CN 112904164 A CN112904164 A CN 112904164A CN 202110318848 A CN202110318848 A CN 202110318848A CN 112904164 A CN112904164 A CN 112904164A
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CN
China
Prior art keywords
voltage
resistor
electrically connected
leakage current
circuit
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110318848.9A
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Chinese (zh)
Inventor
李宇航
候西伦
姜兴梅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xi'an Cheegon Electric Co ltd
Original Assignee
Xi'an Cheegon Electric Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Xi'an Cheegon Electric Co ltd filed Critical Xi'an Cheegon Electric Co ltd
Priority to CN202110318848.9A priority Critical patent/CN112904164A/en
Publication of CN112904164A publication Critical patent/CN112904164A/en
Pending legal-status Critical 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
    • 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
    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

The invention belongs to the technical field of motor testing, and relates to a high-voltage insulation level tester, which comprises an MCU (microprogrammed control unit) controller, a leakage current detection circuit, a booster circuit, a display screen, a fault protection circuit and a high-voltage current-limiting resistor; the MCU controller is respectively electrically connected with the leakage current detection circuit, the booster circuit, the display screen and the fault protection circuit, the booster circuit is respectively electrically connected with the leakage current detection circuit and the high-voltage current-limiting resistor, the leakage current detection circuit is electrically connected with the ground, and the high-voltage current-limiting resistor is electrically connected with the motor to be detected. The invention does not need a power frequency withstand voltage tester, a megger or other withstand voltage test equipment for testing, simplifies the test equipment, reduces the test cost and improves the test efficiency.

Description

High-voltage insulation level tester
Technical Field
The invention belongs to the technical field of motor testing, and relates to a high-voltage insulation level tester.
Background
After the high-voltage motor is installed and before the high-voltage motor is started in a live state, a series of tests such as an insulation test are generally performed. The traditional test scheme usually needs a power frequency withstand voltage tester, a megger or other withstand voltage test equipment to carry out the test. These tests should be tested in a non-live condition of the device under test and require certain electrician knowledge from the tester. In these conventional testing methods, especially when a megger is used for insulation testing, certain misjudgment occurs due to the relationship of the rotation speed. The traditional test method cannot realize online test, and after the equipment is insulated and aged, early warning cannot be realized before an obvious accident phenomenon occurs, and intermittent repeated detection needs to be carried out through frequent routing inspection.
Disclosure of Invention
In order to achieve the above object, the present invention provides a high voltage insulation level tester, which solves the problems in the prior art.
The technical scheme adopted by the invention is as follows: a high-voltage insulation level tester comprises an MCU controller, a leakage current detection circuit, a booster circuit, a display screen, a fault protection circuit and a high-voltage current-limiting resistor; the MCU controller is respectively electrically connected with the leakage current detection circuit, the booster circuit, the display screen and the fault protection circuit, the booster circuit is respectively electrically connected with the leakage current detection circuit and the high-voltage current-limiting resistor, the leakage current detection circuit is electrically connected with the ground, and the high-voltage current-limiting resistor is electrically connected with the motor to be detected.
Preferably, the leakage current detection circuit comprises resistors R1, R2, R3, R4, R5, capacitors C2, C8 and a controllable precision voltage stabilization source VD1, the leakage current detection circuit is electrically connected in a manner that pins 2 and 3 of the VD1 are pulled up through a resistor R1 and are used as a reference, a secondary side signal of the current transformer is converted into a voltage signal through the resistors R2, R3, R4 and R5, the reference is determined through the VD1 of the MCU controller, voltages at two ends of the sampling resistor are filtered and input into a second a/D port of the MCU controller, a reference voltage is filtered and input into a first a/D port of the MCU controller, and a port 1 of the VD1 of the leakage current detection circuit is connected to the ground.
Preferably, the boost circuit comprises diodes D7, D8, D9, a switching power supply control chip U2, a switching transformer, a triode Q7, resistors R49, R65, R70-81, capacitors C20 and C22-26, the boost circuit is electrically connected in a manner that a power supply supplies power to the switching power supply control chip U2 through the resistor R65, a pin 10 of the U2 is connected to an I/O port of the MCU through the resistor R49 to control whether the switching power supply chip is enabled or not, a pin 14 of the U2 is connected to a base of the triode Q7 to control on or off of the triode Q7, the triode Q7 boosts in an inverse parallel manner, a boosted voltage of the MCU controller enters an operational amplifier through a 50M resistor R70 after being filtered, and a filtered signal after being amplified enters a third a/D port of the MCU controller.
Preferably, the display screen is electrically connected with a serial peripheral port SPI of the MCU controller.
Preferably, the fault protection circuit comprises a triode Q2, resistors R12, R15, a diode D2 and a relay K3, the fault protection circuit is electrically connected in a manner that the transistor Q2 is turned on or off to control the pull-in or the disconnection of the relay K3, the resistor R15 is used for preventing the transistor Q2 from being turned on by mistake, the diode D2 can provide a discharging path of a relay coil, and the base of the triode Q2 is electrically connected to an I/O port of the MCU controller through the resistor R12.
Preferably, the high-voltage current-limiting resistor comprises a power resistor, the common end of the high-voltage current-limiting resistor is connected with the anode of the booster circuit, the cathode of the booster circuit is connected with the ground, the high-voltage current-limiting resistor is divided into three ports which are respectively connected with the ABC three-phase, and the motor shell is connected with the ground.
The invention has the beneficial effects that:
1. the invention does not need a power frequency withstand voltage tester, a megger or other withstand voltage test equipment for testing, simplifies the test equipment, reduces the test cost and improves the test efficiency.
2. The invention avoids the error caused by the relation of the rotating speed of the megger when the megger is used for testing, and improves the precision and the accuracy of the test result.
3. The invention can meet the requirement of testing under the condition that the generator is electrified during testing, and really realizes on-line testing, so that early warning can be realized before an accident occurs after the equipment is insulated and aged, repeated mechanical testing work is not needed, the working efficiency is improved, and the workload is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a circuit configuration of a high voltage insulation level tester;
FIG. 2 is a schematic diagram of a high voltage current limiting resistor;
FIG. 3 is a schematic view of an insulation resistance testing apparatus;
FIG. 4 is a leakage current detection circuit diagram;
FIG. 5 is a boost circuit diagram;
fig. 6 is a fault protection circuit diagram.
Detailed Description
The related art in the present invention will be described clearly and completely with reference to the accompanying drawings in the following embodiments, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 5, a high voltage insulation level tester includes an MCU controller, a leakage current detection circuit, a voltage boosting circuit, a display screen, a fault protection circuit, and a high voltage current limiting resistor; the MCU controller is respectively electrically connected with the leakage current detection circuit, the booster circuit, the display screen and the fault protection circuit, the booster circuit is respectively electrically connected with the leakage current detection circuit and the high-voltage current-limiting resistor, the leakage current detection circuit is electrically connected with the ground, and the high-voltage current-limiting resistor is electrically connected with the motor to be detected.
Further, the leakage current detection circuit comprises resistors R1, R2, R3, R4, R5, capacitors C2, C8 and a controllable precision voltage stabilization source VD1, wherein the leakage current detection circuit is electrically connected in a mode that pins 2 and 3 of the VD1 are pulled up through a resistor R1 and are used as a reference, secondary side signals of the current transformer are converted into voltage signals through the resistors R2, R3, R4 and R5, the reference is determined by the MCU through the VD1, voltages at two ends of the sampling resistor are filtered and then input into a second a/D port of the MCU controller, reference voltages are filtered and input into a first a/D port of the MCU controller, and a port 1 of the VD1 of the leakage current detection circuit is connected to the ground.
Further, the boost circuit comprises diodes D7, D8, D9, a switch power supply control chip U2, a switch transformer, a triode Q7, resistors R49, R65, R70-81, capacitors C20 and C22-26, the boost circuit is electrically connected in a mode that a power supply supplies power to the switch power supply control chip U2 through the resistor R65, a pin 10 of the U2 is connected to an I/O port of the MCU through a resistor R49 to control whether the switch power supply chip is enabled or not, a pin 14 of the U2 is connected with a base of the triode Q7 to control the on or off of the triode Q7, the triode Q7 boosts in a reverse parallel connection mode, boosted voltage of the MCU controller enters an operational amplifier through a 50M resistor R70 after being filtered, and the filtered signal enters a third A/D port of the MCU controller after being amplified.
Further, the display screen is electrically connected with a serial peripheral port SPI of the MCU controller.
Further, the fault protection circuit comprises a triode Q2, resistors R12, R15, a diode D2 and a relay K3, the fault protection circuit is electrically connected in a manner that the triode Q2 is turned on or off to control the pull-in or the disconnection of the relay K3, the resistor R15 is used for preventing the triode Q2 from being turned on by mistake, the diode D2 can provide a discharging path of a relay coil, and the base of the triode Q2 is electrically connected to an I/O port of the MCU controller through the resistor R12.
Furthermore, the high-voltage current-limiting resistor comprises a power resistor, the common end of the high-voltage current-limiting resistor is connected with the anode of the booster circuit, the cathode of the booster circuit is connected with the ground, three ports of the high-voltage current-limiting resistor are divided into three ports which are respectively connected with the ABC three-phase, and the motor shell is connected with the ground.
Examples
Specifically, the connection mode of each component in this real-time example is as follows
1. The power supply comprises 220V alternating current and is connected to No. 25 and 26 external terminals of the insulation resistance testing device during testing. The alternating current power supply outputs 9V after passing through a fuse F1, a voltage dependent resistor R1 and a switching power supply U1, and the 9V outputs 5V through a W2 and is connected to the power port of the MCU.
2. The positive pole of the booster circuit is connected with one end of the resistor to be tested, and the negative pole of the booster circuit is connected with the other end of the resistor and then is connected with the pin 10 of the U5 through the inductor L1, the resistor R16 and the capacitor C7. The pin 10 of the U5 is connected to the pin 3 of the U6 through a resistor R14, and the pin 6 of the U6 is connected to the A/D port of the MCU
The specific steps of the real-time test are as follows:
firstly, debugging the insulation resistance detection function:
1. the tested resistor is connected between the DC + and the DC-of the insulation resistance testing device.
2, 220V alternating current is connected between the L and the N, and a green indicator light of the insulation resistance testing device is on.
3. And recording the insulation resistance value on the display screen of the insulation resistance testing device.
4. And (5) testing power-off replacement resistance.
5. And recording the test data.
Secondly, debugging the leakage current test function:
1. the insulation resistance testing devices I1 and I2 are connected with two ends of the current generating device, and have no direction.
2, 220V alternating current is connected between the L and the N, and a green indicator light of the insulation resistance testing device is on.
3. And (4) recording the leakage current value on the display screen of the insulation resistance testing device and comparing the leakage current value with the value of the current generating device, wherein the error is within 5%.
And finally, testing the fault alarm function:
220V alternating current is connected between the voltage 1, the voltage L and the voltage N, and a green indicator light of the insulation resistance testing device is turned on.
2. And adjusting the insulation resistance and leakage current protection value of the insulation resistance testing device.
3. And debugging according to the steps of insulation resistance detection and leakage current test.
4. The red indicator light of the insulation resistance testing device is on, and the buzzer alarms at the same time.
In conclusion, the invention provides the high-voltage insulation level tester, a power frequency withstand voltage tester, a megger or other withstand voltage test equipment is not needed for testing during testing, the test equipment is simplified, the test cost is reduced, the test efficiency is improved, and meanwhile, the precision and the accuracy of a test result are improved, so the high-voltage insulation level tester has wide application prospect.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (6)

1. A high-voltage insulation level tester is characterized by comprising an MCU controller, a leakage current detection circuit, a booster circuit, a display screen, a fault protection circuit and a high-voltage current-limiting resistor; the MCU controller is respectively electrically connected with the leakage current detection circuit, the booster circuit, the display screen and the fault protection circuit, the booster circuit is respectively electrically connected with the leakage current detection circuit and the high-voltage current-limiting resistor, the leakage current detection circuit is electrically connected with the ground, and the high-voltage current-limiting resistor is electrically connected with a motor to be detected.
2. The high-voltage insulation level tester according to claim 1, wherein the leakage current detection circuit comprises resistors R1, R2, R3, R4, R5, capacitors C2, C8, and a controllable precision voltage regulator VD1, the leakage current detection circuit is electrically connected in a manner that 2 and 3 pins of VD1 are pulled up through a resistor R1 and are used as references, secondary side signals of the current transformer are converted into voltage signals through resistors R2, R3, R4, and R5, the MCU 1 determines the references, the voltages at two ends of the sampling resistor are filtered and then input into the second a/D port of the MCU controller, the reference voltage is input into the first a/D port of the MCU controller through filtering, and the 1 port of the VD1 of the leakage current detection circuit is connected to the ground.
3. The high-voltage insulation level tester as claimed in claim 1, wherein the boost circuit comprises diodes D7, D8, D9, a switching power supply control chip U2, a switching transformer, a transistor Q7, resistors R49, R65, R70-81, capacitors C20, C22-26, the boost circuit is electrically connected in such a way that a power supply supplies power to the switching power supply control chip U2 through a resistor R65, a pin 10 of the U2 is connected to an I/O port of the MCU through a resistor R49 to control whether the switching power supply chip is enabled or not, a pin 14 of the U2 is connected to a base of the transistor Q7 to control on or off of the transistor Q7, the transistor Q7 boosts in an inverse parallel manner, the boosted voltage of the MCU controller is filtered and then enters an operational amplifier through a 50M resistor R70, and the filtered wave after signal amplification enters a third a/D port of the MCU controller.
4. The high voltage insulation level tester according to claim 1, wherein the display screen is electrically connected to the serial peripheral port SPI of the MCU controller.
5. The high voltage insulation level tester as claimed in claim 1, wherein the fault protection circuit comprises a triode Q2, resistors R12, R15, a diode D2 and a relay K3, the fault protection circuit is electrically connected to control the pull-in or the disconnection of the relay K3 by the on or off of the triode Q2, the resistor R15 is used to prevent the triode Q2 from being turned on by mistake, the diode D2 is used to provide a path for the discharge of the relay coil, and the base of the triode Q2 is electrically connected to the I/O port of the MCU controller through a resistor R12.
6. The high-voltage insulation level tester according to claim 1, wherein the high-voltage current-limiting resistor comprises a power resistor, a common terminal of the high-voltage current-limiting resistor is connected with a positive electrode of the booster circuit, a negative electrode of the booster circuit is connected with the ground, the high-voltage current-limiting resistor is divided into three ports which are respectively connected with ABC three phases, and the motor housing is connected with the ground.
CN202110318848.9A 2021-03-25 2021-03-25 High-voltage insulation level tester Pending CN112904164A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110318848.9A CN112904164A (en) 2021-03-25 2021-03-25 High-voltage insulation level tester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110318848.9A CN112904164A (en) 2021-03-25 2021-03-25 High-voltage insulation level tester

Publications (1)

Publication Number Publication Date
CN112904164A true CN112904164A (en) 2021-06-04

Family

ID=76106526

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110318848.9A Pending CN112904164A (en) 2021-03-25 2021-03-25 High-voltage insulation level tester

Country Status (1)

Country Link
CN (1) CN112904164A (en)

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