CN108303608B - Lightning arrester conventional test comprehensive testing device - Google Patents
Lightning arrester conventional test comprehensive testing device Download PDFInfo
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- CN108303608B CN108303608B CN201810019778.5A CN201810019778A CN108303608B CN 108303608 B CN108303608 B CN 108303608B CN 201810019778 A CN201810019778 A CN 201810019778A CN 108303608 B CN108303608 B CN 108303608B
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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
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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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- Testing Relating To Insulation (AREA)
Abstract
A comprehensive tester for a conventional test of a lightning arrester comprises a high-voltage power supply, a pulse capacitor, a micro ammeter, an input conversion switch, a pulse output switch, a microcontroller, an analog-to-digital converter and other main components. The insulation resistance testing device is characterized in that the microcontroller controls the output voltage of the high-voltage power supply, the counter calibration module controls the high-voltage power supply to charge the pulse capacitor and control the pulse output switch to simulate lightning stroke output, and the device is internally provided with the current generator and the micro-current sampling module to realize the field calibration of the current monitoring meter. The invention has simple structure, reasonable design, convenient operation, safety and reliability, and can simultaneously meet the measurement of the insulation resistance of the tested product, the action performance of the discharge counter and the precision of the on-line monitoring ammeter by only leading out the positive electrode and the negative electrode to the tested product.
Description
The technical field is as follows:
the invention relates to the field of electrical tests, in particular to a comprehensive device for detecting the insulation resistance of a lightning arrester, a discharge counter and the field calibration of a current monitoring meter.
Background art:
in the conventional test of the existing lightning arrester, the measurement of the insulation resistance is indispensable, the defects of internal moisture, aging, porcelain bushing cracks and the like can be effectively found, and the insulation condition of the lightning arrester base with the base can be obtained. The on-line monitoring device of the lightning arrester comprises a discharge counter and a leakage current monitoring meter, wherein the discharge counter can effectively record the lightning falling condition of the area, the number of times of lightning impulse voltage suffered by the protected line, equipment and equipment, so that the running state and the aging degree of the protected line, equipment and equipment can be judged, and corresponding maintenance measures can be taken conveniently; the leakage current monitoring meter is used for monitoring leakage current passing through the valve block core of the lightning arrester under the operating voltage, the current passing through the valve block core of the lightning arrester under the normal operating voltage is very small, and whether abnormal conditions such as dampness and aging exist in the lightning arrester can be judged by monitoring the change of the leakage current.
Therefore, the measurement of the insulation resistance of the lightning arrester, the reliability of the action of the counter and the accuracy of the indication of the current monitoring meter are very important for ensuring the safe and stable operation of the lightning arrester. The three test items need to use three sets of instruments, namely a megohmmeter, a lightning stroke counter calibrator and a current monitoring meter calibrator, so that the cost is high, the carrying is inconvenient, the complexity of field work is increased, and the requirement on the professional level of test maintainers is high.
The invention content is as follows:
the invention aims to provide a comprehensive tester for the conventional test of the lightning arrester, which has the advantages of reliable work, simple and practical operation and convenient carrying, integrates the functions of insulation resistance test, correct action condition of a discharge counter and accuracy of current monitoring meter indication, and can conveniently finish the three electrical tests.
The problems to be solved by the invention are realized by adopting the following technical scheme.
A comprehensive tester for conventional tests of lightning arresters comprises a high-voltage power supply, a pulse capacitor, a micro ammeter, an input conversion switch, a pulse output switch, a microcontroller, an analog-to-digital converter, a key, a display and other main components. The method is characterized in that: the high-voltage power supply and the pulse capacitor are controlled by the switch and respectively switched according to different measurement modes.
The insulation resistance testing device is characterized in that a microcontroller controls the output voltage of a high-voltage power supply, an analog-to-digital converter samples the output voltage and current, and software calculates the insulation resistance.
And the counter checking module controls the high-voltage power supply to charge the pulse capacitor and control the pulse output switch by the microcontroller, simulates lightning stroke output and checks whether the counter can act correctly.
The device is internally provided with a current generator and micro-current sampling, so that the on-site verification of the current monitoring meter is realized.
The device has the advantages of simple structure, reasonable design and convenient operation, and can simultaneously meet the requirements of measuring the insulation resistance of a tested product, the action performance of a discharge counter and the precision of an online monitoring ammeter.
Description of the drawings:
the invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a functional logic block diagram of the present invention.
Fig. 2 is a block diagram of the inventive construction scheme.
Fig. 3 is a schematic diagram of a voltage current sampling loop of the present invention.
FIG. 4 is a diagram of a high voltage generating circuit and a control circuit according to the present invention.
Fig. 5 is a diagram of specific components of the microcontroller of the present invention.
In figure 2, 1 is a man-machine control interface 2, an embedded control mainboard 3, a flexible high-voltage controller 4, a high-voltage sampling 5, a high-voltage power amplifier 6, an output function conversion 7, a precise analog-digital sampling 8, a micro-current sampling 9, a current generator 10, auxiliary circuits 11 of power management, lithium battery protection, charging, switching and the like, and a pulse capacitor
The specific implementation mode is as follows:
in order that the objects and functions of the invention will be readily apparent, the invention will be further described with reference to the accompanying drawings.
The embedded mainboard 2 obtains the instruction control corresponding function of the man-machine control 1, the flexible high-voltage controller 3 is configured, and the high-voltage control amplifier 4 generates a high-voltage direct-current power supply.
When the man-machine control 1 inputs an insulation test instruction, the embedded control mainboard 2 is provided with the output change-over switch 6 to cut off a charging loop of the pulse capacitor 11, and high-voltage direct current is directly transmitted to a tested device. Then, the micro-current sampling 8 samples the leakage current of the sample and connects the sample to the precision analog-digital sampling 7 for digital processing, and the embedded control mainboard 2 samples the logic signal of the precision analog-digital sampling 7 and performs mathematical operation to obtain the insulation resistance value.
When the man-machine control 1 inputs an instruction of a counter test, the embedded control mainboard 2 is provided with an output change-over switch 6 to switch on a charging loop of the pulse capacitor 11, and pulse triggering is carried out on output. When the set times are reached, the embedded control main board 2 is configured to finish the measurement, and the residual charge of the pulse capacitor 11 is discharged to ensure the safety.
When the man-machine control 1 inputs an instruction for checking the current monitoring meter, the output change-over switch 6 cuts off a charging loop of the pulse capacitor 11, the embedded control mainboard 2 is provided with a current generator 9 to quantize an output current value, then the micro-current sampling 8 samples the output standard current and connects the output standard current to the precision analog-digital sampling 7 to be processed digitally, and the embedded control mainboard 2 samples a logic signal of the precision analog-digital sampling 7 and performs mathematical operation to display the output current value.
Fig. 3 and 4 are schematic circuit diagrams of embodiments of the present invention. The specific circuit and the working principle of the invention for realizing the field calibration function of the arrester insulation resistor, the discharge counter and the current monitoring meter are described in detail below with reference to fig. 3 and 4.
As shown in fig. 3, the end E is a low-voltage side input end, when RL1 is normally closed, the counter check circuit is connected, and when the voltage of the pulse capacitor circuit reaches a preset value, the STM32F103 microcontroller controls the M1 thyristor drive module to conduct and control Q1, so that the counter can be checked to output a pulse signal.
When RL1 switches to normally open contact, U1A operational amplifier carries out the conversion with the electric current that flows in the E end, obtains the voltage signal, then inserts STM32F103 with voltage signal I2U and carries out analog-to-digital conversion. The tail end current signal HV _ DIS2 of the R22 high-voltage sampling resistor is connected to the input end of the U1B transimpedance amplification loop, wherein R10 is a sampling resistor for current-voltage conversion, and C6 is a filtering and phase compensation capacitor. And the obtained voltage signal U2U is connected to the STM32F103 microcontroller for analog-to-digital conversion to obtain a high-voltage value. According to ohm's law R ═ U/I, the insulation resistance value can be measured by matching with the excitation voltage of the high voltage generation voltage.
Fig. 4 shows that the high voltage generating circuit is divided into a voltage error comparing circuit, a current error comparing circuit, a pulse width generating circuit, a boosting voltage doubling circuit, and a capacitor charging and discharging circuit.
The follower formed by the R19, the C13, the U2B and the R15 provides driving capability for the voltage signal of the DAC 1.
U2A, R14, R16, R21, C7, C9 and the like form a voltage error comparator, and the high-voltage output voltage is R21/R16VDAC1. The principle is that when the high voltage output is higher than the set voltage of the DAC1, the U2A outputs a positive signal, and the U3 pulse width controller reduces the positive duty cycle of the pulse, otherwise, the positive duty cycle is reduced, so as to drive the on-time of the transistor Q2. The high-frequency transformer T1 is controlled by the conduction time of the Q2, so that the voltage of the output secondary side is controlled, and closed-loop control of the voltage is formed.
The principle of the current error comparison circuit is the same as that of the voltage error comparison circuit, but the sampling signal is from the voltage signal of R24, the current flowing through R24 is the output current of the high-voltage loop, and the corresponding output current can be generated by setting the output voltage of the DAC2, so that the verification of the current monitoring table can be carried out.
RL2 and R25 are discharge circuits, and when the measurement is completed, the normally closed contacts are restored to discharge.
RL3 is a pulsed capacitive charging switch, and RL3 operates to close normally open contacts when the counter is verified. The capacitors C16 and R26 form a pulse capacitor energy storage loop, and R26 is arranged for preventing overvoltage generated by accumulation of high-voltage static electricity on the capacitors.
U4 is a Darlington drive array ULN2003, dedicated to driving relays and thyristor modules.
As shown in fig. 5, the PC [7..0] of the microcontroller has an analog sampling function, and the sampling precision can reach 16 BIT. The PA4 and PA5 have 12BIT digital-to-analog conversion function, and generate corresponding voltages according to actual needs. PB 11, 8 is general input and output for controlling relay and SCR.
The methods of use and advantages of the present invention have been described above. It will be understood by those skilled in the art that various modifications and enhancements may be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (1)
1. The utility model provides a lightning arrester routine test integrated test device, collects insulation resistance testing arrangement, counter check-up module, current monitoring table check-up in an organic whole, includes: high voltage power supply, pulse capacitor, little ampere meter, input change over switch, pulse output switch, STM32F103 microcontroller, adc, button, display, its characterized in that: the high-voltage power supply and the pulse capacitor are controlled by a switch and are respectively switched according to different measurement modes;
in the insulation resistance testing device, an STM32F103 microcontroller controls the output voltage of a high-voltage power supply, an analog-to-digital converter samples the output voltage and current, and software calculates the insulation resistance;
the STM32F103 microcontroller controls the high-voltage power supply to charge the pulse capacitor and controls the pulse output switch to simulate lightning stroke output, and the counter is checked to determine whether the counter can act correctly;
the testing device is also internally provided with a current generator to realize the on-site verification of the current monitoring meter;
the specific circuit and the working principle of the on-site calibration function of the arrester insulation resistor, the counter and the current monitoring meter are as follows: the end E is a low-voltage side input end, when RL1 is normally closed, the counter check circuit is connected, when the voltage of the pulse capacitor circuit reaches a preset value, the STM32F103 microcontroller controls the M1 silicon controlled rectifier driving module to conduct and control the Q1 diode, and then the counter action can be checked by outputting a pulse signal to the outside;
when RL1 switches to a normally open contact, the U1A operational amplifier converts the current flowing into the E end to obtain a voltage signal I2U, and then the voltage signal I2U is connected to an STM32F103 microcontroller for analog-to-digital conversion; connecting a tail end current signal HV _ DIS2 of an R22 high-voltage sampling resistor to an input end of a U1B transimpedance amplification loop, wherein R10 is a sampling resistor for current-voltage conversion, and C6 is a filtering and phase compensation capacitor; the obtained voltage signal U2U is connected to the STM32F103 microcontroller for analog-to-digital conversion to obtain a high-voltage value; according to ohm's law, the insulation resistance value can be measured;
a follower formed by the R19 resistor, the C13 capacitor, the U2B operational amplifier and the R15 resistor provides driving capability for a voltage signal of the digital-to-analog converter DAC 1;
the U1A operational amplifier, R14 resistor, R16 resistor, R21 resistor, C7 capacitor and C9 capacitor form a voltage error comparator, and the high-voltage output voltage is R21/R16VDAC1(ii) a The principle is that when the high-voltage output voltage is higher than the set voltage of the digital-to-analog converter DAC1, the U2A operational amplifier outputs a positive signal, the U3 pulse width controller reduces the positive duty ratio of the pulse, otherwise, the positive duty ratio is increased, so that the on-time of the transistor Q2 is driven; the high frequency transformer T1 is controlled by the on time of the transistor Q2, so that the voltage of the output secondary is controlled to form a closed loop of voltageControlling;
the principle of the current error comparison circuit is the same as that of the voltage error comparison circuit, but the sampling signal of the current error comparison circuit is from the voltage signal of the R24 resistor, the current flowing through the R24 resistor is the output current of the high-voltage loop, and the corresponding output current can be generated by setting the output voltage of the DAC2, so that the verification of the current monitoring table is carried out;
the RL2 switch and the R25 resistor are discharge circuits, and when the measurement is finished, the normally closed contact is recovered to discharge;
RL3 is a pulse capacitance charging switch, and when the counter is verified, RL3 acts to close the normally open contact; the C16 capacitor and the R26 resistor form a pulse capacitor energy storage loop, and the R26 resistor is arranged for preventing overvoltage generated by accumulation of high-voltage static electricity on the capacitor;
u4 is Darlington drive array ULN2003, special drive relay and M1 silicon controlled rectifier drive module;
PC [7..0] of the STM32F103 microcontroller has an analog sampling function, and the sampling precision can reach 16 BIT; the PA4 and PA5 have 12BIT digital-to-analog conversion function, and generate corresponding voltages according to actual needs; PB [11..8] is general purpose input and output for controlling the relay and M1 SCR drive module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810019778.5A CN108303608B (en) | 2018-01-09 | 2018-01-09 | Lightning arrester conventional test comprehensive testing device |
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| CN201810019778.5A CN108303608B (en) | 2018-01-09 | 2018-01-09 | Lightning arrester conventional test comprehensive testing device |
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| CN108303608A CN108303608A (en) | 2018-07-20 |
| CN108303608B true CN108303608B (en) | 2021-02-26 |
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| CN109814059A (en) * | 2019-03-18 | 2019-05-28 | 西安旭之辉机电科技有限公司 | A kind of million volts of lightning arrester monitor calibration equipments |
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| CN204613333U (en) * | 2015-05-25 | 2015-09-02 | 国家电网公司 | A kind of arrester detecting device for electric system |
| CN106125030A (en) * | 2016-06-27 | 2016-11-16 | 国网甘肃省电力公司白银供电公司 | The multifunctional check of Portable arrester on-Line Monitor Device |
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| US6405081B1 (en) * | 1999-04-22 | 2002-06-11 | Koninklijke Philips Electronics N.V. | Damped biphasic energy delivery circuit for a defibrillator |
| CN201156065Y (en) * | 2007-12-04 | 2008-11-26 | 浙江省送变电工程公司 | Comprehensive test instrument of on-line monitoring instrument for lightning arrester |
| JP5106266B2 (en) * | 2008-06-23 | 2012-12-26 | 三菱電機株式会社 | Lightning arrester leakage current condition monitoring device |
| KR101151977B1 (en) * | 2010-09-29 | 2012-06-01 | 한국전력공사 | Apparatus and method for monitoring status of lightning arrester |
| CN202854247U (en) * | 2012-09-18 | 2013-04-03 | 辽宁省电力有限公司电力科学研究院 | Gapless metal oxide surge lightning arrester no residual voltage monitoring device |
| CN103197169A (en) * | 2013-02-25 | 2013-07-10 | 河海大学常州校区 | Lightning arrester comprehensive performance detection circuit |
| CN106291202B (en) * | 2016-09-23 | 2019-04-30 | 国家电网公司 | A kind of electrical characteristic test device of substation's low voltage surge arrester |
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| CN204613333U (en) * | 2015-05-25 | 2015-09-02 | 国家电网公司 | A kind of arrester detecting device for electric system |
| CN106125030A (en) * | 2016-06-27 | 2016-11-16 | 国网甘肃省电力公司白银供电公司 | The multifunctional check of Portable arrester on-Line Monitor Device |
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